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Display Method:
An algorithm for precise image registration based on priori mark features
LIU Tianbi, FENG Rui
 doi: 10.3969/j.issn.1000-5641.202021006
[Abstract](122) [FullText HTML](96) [PDF 1417KB](11)
Abstract:
The use of a gene sequencer requires that the lens and gene chip are aligned accurately before base-calling. We propose an algorithm to calculate the deviation of the field of view (FOV) from the ideal position. Marks are set at locations on the gene chip in advance, so that the deviation in position of the lens relative to the gene chip can be analyzed. Firstly, the marked locations are captured by extracting grayscale features of the image to initially align the center of the FOV; secondly, the coordinates for multiple key points on the marks are captured; and finally, the location and angle deviations are calculated by mapping coordinates for the key points. Practical and experimental analysis show that the image registration algorithm designed in this paper can achieve a high-precision estimate for the position deviation between the FOV and the gene chip.
2021, No.2 Date: Tue Mar 30 00:00:00 CST 2021 Previous Issue
Display Method:
Estuary and Coastal Research
The distribution of peak wind speeds induced by typhoons along the coasts of the Changjiang Estuary and Hangzhou Bay
LI Lu, DU Xiaotao
 doi: 10.3969/j.issn.1000-5641.2021.02.001
[Abstract](0) [FullText HTML](0) [PDF 1646KB](0)
Abstract:
In this study, four typical typhoons that significantly affected Shanghai were selected based on their respective intensity and the water level along the Shanghai Coast. The RMW (Radius of Maximum Winds) formula, moreover, was determined using in-situ data from recent typhoons. The typhoon model was built and validated using in-situ wind speeds from the four typhoons selected. The peak wind speed and the forward peak wind speed along the Shanghai Coast were calculated, case by case, during all typhoons over the period from 1949 to 2014 as well as the four typical typhoons selected. Finally, the range and distribution of the peak (forward peak) wind speed were quantitatively studied.
Spatial and temporal variations in the residual water level of the Changjiang Estuary and its cause
YANG Zhengdong, ZHU Jianrong, SONG Yunping, GU Jinghua
 doi: 10.3969/j.issn.1000-5641.2021.02.002
[Abstract](0) [FullText HTML](0) [PDF 1171KB](0)
Abstract:
In this study, we analyzed the spatial and temporal variations in the residual water level of the Changjiang Estuary and evaluated the respective causes. To achieve this objective, we used data from the hourly water level at the Chongxi, Nanmen, and Baozhen hydrological stations in the Changjiang Estuary; daily river discharge levels at the Datong hydrological station; and wind speed and direction at the Chongming eastern shoal weather station in 2016 and 2017. The results showed that the residual water level was the highest at Chongxi station and the lowest at Baozhen station among the three hydrological stations in each month. The drops in residual water level among the hydrological stations became smaller during low river discharge and tended to become larger during high river discharge. Higher levels of river discharge were associated with a larger drop in the residual water level. In 2016, the residual water levels at the Chongxi, Nanmen, and Baozhen hydrological stations were lowest in February with values of 2.09, 1.96, and 1.93 m, respectively; similarly, the residual water levels were the highest in July with values of 2.91, 2.62, and 2.50 m, respectively. The residual water level was mainly affected by river discharge, while the wind was also an important influencing factor in the variations observed. Southerly wind made the residual water level decrease, and northerly wind made it increase. In 2017, the minimum monthly mean residual water level occurred in December with values of 2.04, 1.91, and 1.87 m at the Chongxi, Nanmen, and Baozhen hydrological stations, respectively; this coincided with the lowest annual river discharge observed during the same period. The maximum monthly mean residual water level occurred in October with values of 2.79, 2.58, and 2.49 m at the Chongxi, Nanmen, and Baozhen hydrological stations, respectively. Although the river discharge was lower in October than the one in July by 24214 m3/s, the residual water level was higher in October than that in July. The explanation for this phenomenon is the persistent strong northerly wind observed in middle to late October, which produced strong landward Ekman water transport, and resulted in the water level rise. The spatial and temporal variation in the residual water level of the Changjiang Estuary is remarkable, and should be considered in engineering design and theoretical research.
Analysis of the characteristics of the Qingcaosha Reservoir direct saltwater intrusion from the open sea in the Changjiang Estuary
ZHU Yiping
 doi: 10.3969/j.issn.1000-5641.2021.02.003
[Abstract](0) [FullText HTML](0) [PDF 1463KB](0)
Abstract:
Qingcaosha Reservoir is the main water source for Shanghai, providing approximately 55% of its high-quality raw water needs, and effectively guarantees the safety of water supply for Shanghai. The waters near the Qingcaosha Reservoir experience saltwater spillover from the North Branch into the South Branch; the nearby waters, moreover, suffer from direct saltwater intrusion from the open sea. In this study, a large number of measured salinity data in the upstream and downstream sluice was used to statistically analyze the characteristics of direct saltwater intrusion near the Qingcaosha Reservoir waters in recent decades. The analysis results show that direct saltwater intrusion neat the Qingcaosha Reservoir waters in recent decades was closely related to the river discharge, tide, and wind. There were a total of 16 instances of direct saltwater intrusion at the upstream sluice that occurred from September to March of the following year; likewise, there were a total of 41 instances of direct saltwater intrusion at the downstream sluice that occurred from September to May of the following year. The direct saltwater intrusions at the upstream and downstream sluices appeared primarily in December, January, and February of each year. We found that saltwater intrusions occurred most commonly when the river discharge was less than 18 000 m3/s during neap tide and middle tide (after neap tide) accompanied by persistent northerly or northwesterly winds. We found that the strength and duration of the northerly or northwesterly winds in the days preceding saltwater intrusion had an important role on direct saltwater intrusion.
Magnetic properties of particle-sized fractions of sediments in the Changjiang Estuary and neighboring shelf, and its environmental implications
GE Can, ZHANG Weiguo
 doi: 10.3969/j.issn.1000-5641.2021.02.004
[Abstract](0) [FullText HTML](0) [PDF 1272KB](0)
Abstract:
Twenty-two surface sediments collected from the Changjiang Estuary and neighboring shelf were subjected to particle-size measurements, with the intent of understanding the implications for provenance, transport, and depositional dynamics. The results showed that Changjiang River-derived sediments, relict sands, and Yellow River-derived sediments were the primary sources controlling the magnetic properties of sediments in the study area. The three areas, however, exhibited different spatial distributions. Spatial variations of magnetic parameters, including magnetic susceptibility (χ), saturation isothermal remanent magnetization (SIRM), hard isothermal remanent magnetization (HIRM), and anhysteretic susceptibility (χARM), suggest that sediments from the Changjiang River are transported towards the south and southeast when they move out of the river mouth. According to bi-plots of SIRM versus χ and S-ratio (S–100) versus SIRM, the > 63 μm fraction is roughly bounded by the 30 m isobaths that separates the Changjiang River sediment from the relict sands on the shelf. The < 16 μm fraction is derived mainly from the modern fluvial sources of the Changjiang and Yellow Rivers; in particular, the Changjiang River-derived sediment dominates the inner estuary and the Yellow River-derived sediment dominates the northern coast of the shelf. The other areas of the shelf are characterized by mixed sources of the < 16 μm fraction, with a majority being Changjiang River-derived sediment. Spatial variations of particle size compositions and magnetic properties reflect the role of hydrodynamic sorting on particle size as well as mineral density; this results in differences in magnetic properties among the sedimentary units as well as the contribution of different sized fractions to the bulk SIRM values. Particle size separation could reduce the effect of particle size on bulk magnetic properties and lead to more precise provenance discrimination. Our results have great potential in the study of geomorphological changes and quantitative source identification in delta environments.
Flux footprint analysis of a salt marsh ecosystem in the Jiuduansha Shoals of the Changjiang Estuary
CHEN Zihan, HUANG Ying, TANG Jianwu, TIAN Bo, SHEN Fang, WU Pengfei, YUAN Qing, ZHOU Cheng, WANG Jiangtao
 doi: 10.3969/j.issn.1000-5641.2021.02.005
[Abstract](0) [FullText HTML](0) [PDF 1267KB](0)
Abstract:
Flux footprint analysis is an important step in studying the carbon, water vapor, and heat flux exchange of land-atmosphere interactions based on the eddy covariance (EC) method. In this research, we used the flux source area model (FSAM) to investigate seasonal flux footprints with different wind directions and atmospheric conditions on the basis of half-hourly EC measurements throughout 2018. The results showed that: ① The flux footprint area changes with the seasons. The largest flux footprint area, ordered highest to lowest, was found in autumn, summer, spring, and winter under stable stratification; meanwhile, under unstable stratification, the flux footprint area did not change significantly between seasons. The daily variation in the footprint, moreover, was obvious and the footprint was found to be larger comparatively at nighttime than that observed during the daytime. ② The flux source area under non-prevailing wind conditions was larger than that under the prevailing wind condition. ③ The flux source area was much larger under stable stratification. The distance between the location of the maximum value of the flux footprint and the station was also found to be much larger under stable stratification.
Content and ecological risk assessment of heavy metals in the surface sediments of Qingcaosha Reservoir in Shanghai
ZHU Yiping, LI Xiaofei, LIANG Xia
 doi: 10.3969/j.issn.1000-5641.2021.02.006
[Abstract](0) [FullText HTML](0) [PDF 1722KB](0)
Abstract:
Surface sediments were collected from five representative areas—the floodgate entrance, the north and south sides of the reclamation area, and the central and downstream sections—of Qingcaosha Reservoir; the pollution characteristics and potential ecological risk of seven heavy metals (Cu, Zn, Pb, Cr, Cd, As and Hg) in these sediments were subsequently investigated. Results showed that the heavy metal content in the surface sediments showed spatial variations: the content was relatively higher in the center of the reservoir and was low in the north and south sides of the reclamation area. Heavy metals in the surface sediments, in addition, were mainly in the residual fraction; the content of heavy metals in the exchangeable fraction was extremely low. A potential ecological risk assessment indicated that the comprehensive potential ecological risk index (ERI) of the investigated heavy metals ranged from 55 to 113. The maximum ERI value was observed around the floodgate of the reservoir entrance, and low ERI values were observed at the north and south sides of the reclamation area. The ERI was lower than the threshold for low ecological risk, indicating that heavy metals in the surface sediments of the Qingcaosha Reservoir have low potential ecological risk.
Changes in chlorophyll and nutrients in reservoirs of the Changjiang River basin: The “biological filter” effect
TONG Meng, LI Maotian, NIU Shujie, LIU Xiaoqiang, LIN Mudong, GUO Huiting, HOU Lijun
 doi: 10.3969/j.issn.1000-5641.2021.02.007
[Abstract](0) [FullText HTML](0) [PDF 950KB](0)
Abstract:
The biological filtering effect of reservoirs has become an area of focus for environmental science. We conducted an in situ survey, with different upstream retention times, of chlorophyll-a (Chl.a) and nutrients at the Zhexi, Zhelin, Hualiangting, and Yahekou reservoirs. We found that: ① In the vertical direction, Chl.a in each reservoir had the largest subsurface layer and generally decreased downward, resulting in upper nutrients assimilated by algae and an average vertical retention rate of DIN, DIP, and DSi of the reservoirs at 6.29%, 14.92%, and 8.60%, respectively. ② The concentration of Chl.a and the biomass of phytoplankton generally decreased from upstream to downstream, resulting in lots of nutrients assimilated by algae upstream, and the average horizontal retention rate of DIN, DIP, and DSi of the reservoirs at 26.53%, 39.89%, and 31.70%, respectively. ③ The total average retention rate of DIN, DIP, and DSi of the four reservoirs were 32.82%, 54.80%, and 40.30%, respectively. ④ The concentration of DIP decreased gradually with increases in the reservoir’s retention time; in fact, the concentration of DIP even decreased to 0.1 μmol/L, i.e. the growth of phytoplankton was fully limited by DIP.
Comparison of different extraction methods for alkaline earth metals and its implications: A case study of the surficial sediments from Ningbo Plain
HUANG Jing, ZHENG Tongtong, WANG Aihua, LI Wenjing, WANG Zhanghua
 doi: 10.3969/j.issn.1000-5641.2021.02.008
[Abstract](0) [FullText HTML](0) [PDF 1215KB](0)
Abstract:
The concentrations and relative ratios of alkaline earth metals, such as Sr, Ba, and Ca, in sediments are widely used to discriminate marine and terrestrial environments in paleoenvironmental research. However, geochemical elements occur mostly in mineral crystal lattices (namely, the residual phase after acid extraction), which is not linked to the physical, biological, or chemical environments of the deposition processes. Hence, only selective extraction of phases can be used to interpret changes in the sedimentary environment. In this study, we collected surficial sediments from the present-day saltmarsh-tidal flat, alluvial plain, and tidal river (Yaojiang River) in Ningbo Plain and used a plasma spectrometer to measure the concentrations of Sr, Ba, and Ca in: the leachates extracted by diluted acetic acid (HAc) and diluted hydrochloric acid (HCl), the residues after acid extraction, and the bulk samples. The results showed that alkaline earth metals in the HAc-leachates were most sensitive to changes in the sedimentary environment, followed by the HCl-leachates. No variation in Sr/Ba (molar ratio) could be distinguished in the bulk samples of surficial sediments collected from different sedimentary settings. Furthermore, consistent results were obtained by using different sample amounts and measuring instruments when applying the HAc method. Significant variations in alkaline earth metals in the HAc-leachates were observed for the surficial sediments in this study. Ca and Sr showed the highest concentrations in the saltmarsh-tidal flat sediments and the lowest concentrations in the alluvial sediments; Ba concentration showed the opposite trend. We thus suggest that end-member analyses of the alkaline earth metals in HAc leachates can be used to effectively identify transgression/regression recorded in sedimentary stratigraphy in the coastal zone.
Oxygen depletion and the response of organic matter in Laoyehai, a lagoon with strong aquaculture activities
MA Wenchao, WANG Yan, ZHU Zhuoyi
 doi: 10.3969/j.issn.1000-5641.2021.02.009
[Abstract](0) [FullText HTML](0) [PDF 1549KB](0)
Abstract:
Laoyehai is a lagoon located on the east coast of Hainan and is impacted heavily by human activities (especially those related to aquaculture). Laoyehai is characterized by its eutrophic and hypoxic waters. During previous dry and flood seasons (specifically, April 2010 and August 2011), when hypoxia occurred, field work was conducted to observe the dissolved oxygen (DO) and to collect organic matter. Hypoxia was significant in the spring season with surface DO as low as 50%, while the bottom hypoxic water prevailed in both seasons. In the spring season, the C/N ratio of particulate organic matter was higher than that observed in the summer season (C/N in the spring: 9.7, C/N in the summer: 7.7). Organic matter composition indicated by amino acids showed that there was strong in situ production in the spring relative to that in the summer. Lower C/N values and higher carbon and nitrogen yields of amino acids (AA C yield, AA N yield) in the summer showed active in situ production, suggesting that organic matter was mainly derived from phytoplankton. This also explains the sufficient surface DO in the summer. The degradation of particulate organic matter increased with the decrease of dissolved oxygen, indicating that the particulate organic matter and its degradation were the key driving factors for oxygen consumption in the lagoon. Meanwhile, we found that the relationship between dissolved organic matter components and DO was not significant.
Ecological and Environmental Sciences
Evolution and change of an urban greenspace: A case study on the outer ring of Shanghai
WANG Qiong, WU Bin, YAO Shenjun, WU Jianping, ZHOU Ying, ZHANG Jing
 doi: 10.3969/j.issn.1000-5641.2021.02.010
[Abstract](0) [FullText HTML](0) [PDF 0KB](0)
Abstract:
Urban greenspace is an important part of the urban green system and urban landscape, with important ecological, social, psychological, and economic functions. The evolutionary trajectories and change patterns of urban greenspaces are of great significance to the sustainable development of urban green space systems and the optimization of the urban ecological network. There is ongoing emphasis on urban greenspace research; most previous research studies on greenspace changes have used landscape indices and spatial analysis methods, which struggle to accurately reflect the change process, change types, and spatial distribution patterns of greenspace. In our paper, seven types of greenspace evolution were defined, including continuous, expansion, contraction, dissipation, creation, merging, and splitting. Then, an evolution graph was constructed by defining greenspace patches as nodes and greenspace evolution relations as edges. Based on the greenspace evolution graph, the greenspace evolution process and its corresponding evolutionary trajectory were further extracted and visualized. Taking the Shanghai city center as a case study area, the spatial distribution pattern and change process of the urban greenspace for 2008, 2012, and 2016 were extracted. Results indicated that the most dominant greenspace evolution types were creation and dissipation. The newly added urban greenspace patches were more evenly distributed compared with those patches involved with an evolution type of dissipation. Small patches were more likely to be located in the urban center, while large patches tended to be concentrated in rural areas. The location of greenspace patches that disappeared were mostly concentrated in non-central areas, particularly in the Pudong New Area. Compared with the urban greenspace changes between 2008 and 2012, locations where new greenspace appeared between 2012 and 2016 were more evenly distributed, while locations where greenspace disappeared were more concentrated.
Analysis of land use dynamics and driving forces of water source protection areas in the upper reaches of the Huangpu River
WU Jian, CHEN Li, QIU Sijing, YAN Zhongchun, SU Jinghua, HU Liting, WANG Min
 doi: 10.3969/j.issn.1000-5641.2021.02.011
[Abstract](0) [FullText HTML](0) [PDF 1099KB](0)
Abstract:
Using a combination of 0.25 m resolution aerial remote sensing data and topographic maps, the land use data for the Shanghai Huangpu River Water Source Protection Area in 2000, 2005, 2010, and 2015 were evaluated by means of manual visual interpretation. With the growth of industrial land from 2000 to 2015, there has been a relative decline in the proportion of agricultural land and water areas and a relative increase in the proportion of urban land areas. In the past 15 years, the areas used for farming and cultivating livestock and poultry have decreased by 44.17% and 71.65%, respectively. The area of water reduction has decreased by 6.44%. The area of green land forests, in contrast, has increased by 645.94%. The area of urban land has increased by 53.53%. All types of urban land use have increased, with the area used for industrial storage increasing the most at 21.77%. From the perspective of land transfer, the area of cultivated land transferred outward was the largest in the past 15 years, accounting for 22,839.96 hectares, and the transfer-outward rate of livestock and poultry farming land was the highest at 91.23%. The area of green land forests transferred inward was the largest at 16190.32 hectares; the transfer of industrial storage land inward was the second largest at 7979.12 hectares. Based on an analysis of development in the region, population changes, policy impacts, and other factors, our results indicate that urbanization and industrialization drove the increases in urban land areas; moreover, environmental policies affected green land areas as well as livestock and poultry farming land areas, market regulations affected aquaculture land areas, and environmental policies and urbanization affected water source protection areas.
Distribution and causes of ruderal communities in different urban habitats of Hangzhou
ZHANG Mingli, CUI Yichong, DA Liangjun
 doi: 10.3969/j.issn.1000-5641.2021.02.012
[Abstract](0) [FullText HTML](0) [PDF 1016KB](0)
Abstract:
With the ongoing urbanization process in Hangzhou, we investigated the species composition and structure of ruderal communities across eight urban habitat types. Habitat factors such as light intensity, soil pH, soil electrical conductivity, soil compaction, soil total nitrogen, soil total phosphorus, soil organic matter, and interference types were measured; we subsequently analyzed the relationship between species composition and habitat factors of the ruderal communities. The results indicated that forest gap and lawn were the most common habitat types, and these community types covered 20.1% and 16.3%, respectively, of the total 1665 sampling plots surveyed. In all seven habitats except tree pool, moreover, dwarf-growth annual ruderals were the dominant species within the community. There were 30 ruderal species distributed across eight habitats. Environmental factors varied across the different habitats. The light intensity was the lowest in the forest gap, the soil conductivity value was the highest in the shrub-grassland gap, and the light intensity and soil compactness were the highest in soil abandoned land.
Variation characteristics of plant communities at abandoned farmlands of different ages in the Chongqing suburban area
ZHENG Mingming, LI Xiaohan, HUANG Li, YANG Shenghe, HU Siwei, YANG Yongchuan
 doi: 10.3969/j.issn.1000-5641.2021.02.013
[Abstract](0) [FullText HTML](0) [PDF 794KB](0)
Abstract:
In this study, we investigated the plant species composition of three types of abandoned farmland and compared with cultivated farmland in the Chongqing suburban area. We analyzed dynamic changes in species composition and community type as well as trends in plant diversity. The results showed that a total of 99 species, 90 genera, and 39 families were recorded in the spring and autumn. At the second level of the TWINSPAN classification, the cultivated farmland, early abandoned farmland, and late abandoned farmland could all be distinguished. As the number of years since abandonment of the farmland increased, the dominant life form of the plant community gradually transitioned from annual to perennial, and woody plants began to become the dominant species. Plant diversity gradually increased from the early to middle stage of abandonment, but declined during the later stage.
Vessel characteristics and the density-size relationship of woody plantsat the Shanghai Chenshan Botanical Garden
LI Yuanyuan, SHANG Kankan, ZHANG Xijin, SONG Kun
 doi: 10.3969/j.issn.1000-5641.2021.02.014
[Abstract](0) [FullText HTML](0) [PDF 1018KB](0)
Abstract:
In this study, we measured the branch xylem structure of 85 woody plant species at the Shanghai Chenshan Botanical Garden to compare vessel characteristics among different life forms and check their phylogenetic signals. The trade-off between vessel density and vessel size was subsequently compared among different life forms. The results showed that: ① The vessel diameter ((28.55 ± 8.84) μm) and vessel ratio (8.7% ± 2.89%) of evergreen woody plants were significantly smaller than the vessel diameter ((35.81 ± 13.92) μm) and vessel ratio (12.7% ± 4.82%) of deciduous woody plants; meanwhile, there was no significant difference observed in the vessel density between evergreen plants ((149.3 ± 75.62) N/mm2) and deciduous plants ((164.5 ± 154.28) N/mm2). The vessel diameter of trees ((35.86 ± 13.5) μm) was significantly larger than that of shrubs ((26.24 ± 8.84) μm), but there was no significant difference observed in the vessel ratio and vessel density between trees (12.09% ± 5.01%; (151.9 ± 142.73) N/mm2) and shrubs (10.59% ± 2.99%; (208.7 ± 126.37) N/mm2). ② There were significant phylogenetic signals observed in vessel diameter and vessel density, and the signal of vessel density was larger than that of vessel diameter. There was, however, no obvious phylogenetic signal in the vessel ratio. ③ The standardized major axis test indicated that the trade-off between vessel density and vessel size existed in all life forms, with a common slope coefficient of –0.89 and a 95% confidence interval (–0.98 ~ –0.79). However, the intercept of evergreen trees was significantly smaller than that of deciduous trees, suggesting that deciduous trees have a larger vessel diameter than evergreen trees for a given vessel density.
Variation patterns and influencing factors of air anionsindifferent plant communities of an urban park
SUN Wen, HAN Yujie, YIN Shan
 doi: 10.3969/j.issn.1000-5641.2021.02.015
[Abstract](0) [FullText HTML](0) [PDF 1339KB](0)
Abstract:
In this study, we evaluated the variation patterns of air anions in nine plant communities with different structures in Zhongshan Park of the central city of Shanghai; the air anion concentration was monitored continuously over the course of a year. In addition, we analyzed the influence of different factors—community structure, canopy density, and the level of surrounding water—on air anion concentration. The results showed that the air anion concentration within different community types was mostly between 200 cm3 and 700 cm3, and the daily variation showed a single peak. Air anion concentration remained at a high level but fluctuated significantly from July to October. The relationship between community structure and air anion concentration was roughly as follows: herbage > arbor with shrubs ≈ arbor with herbage > arbor with shrubs and herbage; in general, the more complex the community structure, the less the air anion variability. There was a negative correlation between the mean variation of the air anion concentration and the canopy density, implying that higher canopy density values were associated with lower mean variation of the air anion concentration throughout the community. This negative correlation became more significant in the daytime, between 7:00 to 19:00, when photosynthesis was ongoing. In addition, the impact of static water on the anion concentration was not found to be significant. The conclusion of this paper can provide basic data and a scientific basis for the construction of healthy plant communities in urban parks.
Distribution characteristics and influencing factors of crabs and crab burrows in the Fengxian coastal wetland
LI Xiang, TIAN Huimin, WU Jingying, CHEN Siyu, ZHAO Mingming, XU Ping, CHEN Xuechu, YOU Wenhui
 doi: 10.3969/j.issn.1000-5641.2021.02.016
[Abstract](0) [FullText HTML](0) [PDF 1037KB](0)
Abstract:
This study investigated the distribution characteristics and influencing factors of crabs and crab burrows in Fengxian coastal wetland to reveal the main influencing factors in crabs’ and crab burrows’ distribution and deepen the understanding of crabs’ living habits. The results showed that: ① The abundance of Helice tientsinesis in the high-marsh Phragmites australis habitat is higher than that in the middle-marsh Phragmites australis -Spartina alterniflora mixed habitat and low-marsh Spartina alterniflora habitat (p < 0.01). However, there is no significant difference in the abundance of Sesarma plicate between habitats (p > 0.05). ② The density of crab burrows in the high-marsh Phragmites habitat is significantly higher than that in the middle-marsh Phragmites-Spartina mixed habitat and the low-marsh Spartina habitat (p < 0.05), while the average opening diameter of crab burrows is significantly lower than that in the middle-marsh Phragmites -Spartina mixed habitat and the low-marsh Spartina habitat (p < 0.05). ③ There is no significant linear relationship between crab abundance and the density of crab burrows(p > 0.05), while there is a significant positive correlation between the density of crab burrows and the abundance of Helice tientsinesis (p < 0.01). ④ Crab abundance is negatively correlated with plant underground biomass (p < 0.01). ⑤ There is a negative correlation between the density of crab burrows and vegetation coverage and plant density. The relative elevation, water content, conductivity, total organic carbon content, and total nitrogen content are positively correlated with the density of crab burrows. Among these factors, the relative elevation is the habitat factor with the highest correlation with the density of crab burrows.
Characteristics of main natural disasters and coping strategies in Shanghai(Chinese)
CHEN Zhen-lou, WANG Jun, LIU Min, YU Li-zhong, XU Shi-yuang
[Abstract](10905) [PDF 786KB](707)
Abstract:
The paper pointed out that with global warming, sea level rising and the accelerated urbanization process, the intensity and frequency of natural disasters, and vulnerability of society and economy are growing quickly. Therefore, in order to seek effective disaster prevention and relief measures, natural disasters become hotspots for international society and academy. In Shanghai, one of the major big cities in eastern coastal areas of China, typhoons, rainstorms, storm surges and other natural disasters occur frequently, and often cause serious damages. The characteristics of these disasters are analyzed in detail. Facing the serious situation of risk mitigation and disaster prevention in Shanghai, several countermeasures should be adopted in order to improve Shanghai’s responding ability to natural disasters, which include taking strict precautions against serious natural disasters, developing disaster risk assessment methods and technologies, improving comprehensive disaster relief systems, establishing operational emergency plans, strengthening emergency shelters, relieve the disaster after-effects, promoting volunteer teams for emergency responses and rescues, carrying out disaster prevention publicity and disaster management personnel education.
Fe/ PZFE Nanometer Composites by High Energy Ball Milling
QIAN Fang-zhen, JIANG Ke-yu, RUAN Jian-zhong
[Abstract](10408) [PDF 0KB](319)
Abstract:
Fe/PTFE nanometer compound was prepared by high energy ball milling. Firstly, PTFE was milled for 50h,90h,120h ,then Fe/ PTFE mixture was milled for 700h. The components were indentified by 57Fe Mossbauer spectroscopy. The Mossbauer effect studies show that the spectrum includes not only bothsextets of bulk and interface of a-Fe ,it indicates the size of particle Fe is in the order of nanometer, but also one singlet for Fe3+, one doublet for Fe2+ , they corresponds to FeF2 and FeF3 respectively. As milling time increases,the component of interface of a-Fe disappears, meantime, the Fe3C appears. The result shows that it is helpful to produce FeF3 as PTFE was initially milled.
Sufficient and necessary condition for the chromatic equivalence of a class of graphs
MA Hai-cheng, LI Sheng-gang
[Abstract](7831) [PDF 195KB](2286)
Abstract:
A necessary and sufficient condition for the adjoint equivalence of two graphs with the adjoint minimum real root at least $-$4 was given. Based on this result, a necessary and sufficient condition of the chromatic equivalence for the complement graphs of these graphs can be naturally obtained.
Property of an orthogonal projection matrix
DU Kun, GU Gui-ding
[Abstract](7565) [PDF 210KB](2395)
Abstract:
In this paper we showed that for an orthogonal projection matrix with rank $k$, there exists an principal submatrix with order $k$ of the matrix, such that its Rayleigh quotient has a positive lower bound. The proof was made by using the relation of the singular values, eigenvalues and norm of matrices, as well as the properties of unitary matrix and compound matrix.
Properties of novel poly (aryl ether quinoxaline)s (PEQs)
ZHAO Qiu-tang, Ding Ya-ming, HUA hui
[Abstract](7461) [PDF 1409KB](1864)
Abstract:
Novel poly(aryl ether quinoxaline)s (PEQs) were prepared via a new two-step procedure. Firstly, poly (ether benzil) (PEB) was synthesized by the polycondensation of 4,4-difluorobenzil and 4,4-isopropylidenediphenol. Then, PEQs were synthesized through chemical modification of PEB by 1,2-diaminobenzene and a small amount of 4,4-oxydibenzene-1,2-diamine(OBDA). The polymers were characterized by IR, NMR, TMA and other measurements. Experiments show that these PEQs can be dissolved in common organic solvents, such as DMF and THF; these PEQs were dissolved in THF to get films which had good transmittance in the visible region (the transmittance was up to 85% at 450 nm). In addition, they also had higher glass transition temperatures (Tg210 ℃), good thermal and mechanical properties, as well as excellent resistance to strong acid and alkali. They are expected to be useful functional materials.
Analysis of Remote Sensing Image Format —— GeoTIFF(Chinese)
CHEN Duan-wei, SHU Jiong, WANG Qiang, DUAN Yu-sen
[Abstract](6777) [PDF 0KB](412)
Abstract:
GeoTIFF, a geographically extended image format of TIFF, was studied in this paper. Description and analysis were given to TIFF format, storing methods of GeoKeys, three kinds of coordinate systems supported by GeoTIFF, six GeoTags and their relationships, as well as coordinate transformation and geocoding. Advantages of GeoTIFF were explained, and its application prospect is anticipated.
Analysis of tidal characteristics of the tide gauges in the Changjiang Estuary
YANG Zheng-dong, ZHU Jian-rong, WANG Biao, LIN Tang-yu
[Abstract](6510) [PDF 1190KB](4258)
Abstract:
Based on the measured water levels at Hengsha, Majiagang, Baozhen and Yonglongsha tide gauges in 2009, the tidal temporal and spatial variations, tidal constituents, tidal form and distortion at these gauges in the Changjiang Estuary were analyzed. There exist tidal daily inequalities that mainly occur during high tide levels, and are more significant during neap tides than spring tides in March and September while are more significant during spring tides than neap tides in June and December. The monthly maximum and minimum tidal ranges in each month at the tide gauges were given out statistically. The tidal range in the estuary varies monthly with two peaks: the maximum tidal range reaches the maximum values in March and September, and reaches the minimum values in June and December. The minimum tidal range reaches the maximum values in June and December, and reaches the minimum values in March and September. The tidal range in the South Branch reduced toward upstream due to the river discharge and friction. The tidal range at Yonglongsha tidal gauge is the largest among the 4 tidal gauges because the North Branch has small river discharge division ratio and funnel shape bathymetry. The tide is mainly composed by the 4 semi-diurnal tidal constituent (M 2、S 2、N 2、K 2), 4 diurnal tidal constituent (K 1、O 1、P 1、Q 1) and 3 shallow water tidal constituent (M 4、MS 4、M 6). The semi-diurnal tidal constituents M 2 and S 2 are the predominant ones, and the shallow water tidal constituents M 4 and MS 4 are apparent due to the shallow water in the estuary. The tidal form number in the South Branch is larger than 0.25, indicating where the tide is an irregular semi-diurnal tide type there, and is smaller than 0.25 in the North Branch, indicating where the tide is a regular semi-diurnal tide type. The tidal distortion coefficients in the 4 tidal gauges are all larger than 0.1, indicating that the tide at the tide gauges has significant distortion in the Changjiang Estuary, especially at Yonglongsha in the North Branch with tidal distortion coefficient 0.173.
The Growth Optimal Portfolio in a General Market Driven by Jump-diffusion Processes
XU Zhi-yan
[Abstract](6182) [PDF 0KB](322)
Abstract:
In this paper, We generalize the results of Yan et al[1] results on the growth optimal portfolio in a market driven by jump-diffusion processes with multi-risky assets. Sufficient conditions for existence of growth optimal portfolio in this case were given.
Techniques for estimating click-through rates of Web advertisements: A survey
JI Wen-di, WANG Xiao-ling, ZHOU Ao-ying
[Abstract](5781) [PDF 1639KB](7068)
Abstract:
Computational advertising is a kind of advertising mechanism which has the capability to find the most suitable ads for given users and web content, so as to advertises them accurately. Therefore, estimating click-through rate (CTR) precisely makes significant difference in the efficiency of advertising on the Internet. Ad click-through rate prediction is to estimate CTR with click log, which is influenced by the nature features of ad, the position, the page information, user properties, the reputation of advertisers and such other factors. This paper is aimed to illustrate useful CTR prediction models, including CTR models for ads of abundant history data, CTR models for rare ads or new ads and some optimization models. Finally, the implementation methods with real data set were demonstrated as examples.
Marine hazards in Shanghai coastal regions and corresponding countermeasures: Lessons from the storm surge disaster of Burma (Chinese)
GONG Mao-xun, DU Pan-jun, XUE Zhi-gang
[Abstract](5659) [PDF 2278KB](490)
Abstract:
The paper firstly reviewed the serious storm surge disaster in Myanmar in May of this year, pointing out that global warming, leading to extreme natural disasters. Then analyzed marine hazards in Shanghai coastal regions. Their causes were identified in detail. Gave a description of the existing service for early warning and emergency control of marine hazards in Shanghai. Finally detail suggestions were put forward for countermeasures for these hazards.
Techniques for estimating click-through rates of Web advertisements: A survey
JI Wen-di, WANG Xiao-ling, ZHOU Ao-ying
[Abstract](5781) [PDF 1639KB](7068)
Abstract:
Computational advertising is a kind of advertising mechanism which has the capability to find the most suitable ads for given users and web content, so as to advertises them accurately. Therefore, estimating click-through rate (CTR) precisely makes significant difference in the efficiency of advertising on the Internet. Ad click-through rate prediction is to estimate CTR with click log, which is influenced by the nature features of ad, the position, the page information, user properties, the reputation of advertisers and such other factors. This paper is aimed to illustrate useful CTR prediction models, including CTR models for ads of abundant history data, CTR models for rare ads or new ads and some optimization models. Finally, the implementation methods with real data set were demonstrated as examples.
Click-through rate prediction of online advertisements based on probabilistic graphical model
YUE Kun, WANG Chao-lu, ZHU Yun-lei, WU Hao, LIU Wei-yi
[Abstract](5385) [PDF 1294KB](6445)
Abstract:
CTR (Click-Through Rate) prediction can be used to improve users satisfaction with respect to the presented online advertisements (ads) and support effective advertising. CTR prediction is the basis for personalized recommendation of online ads. It is also necessary to re-commend ads and predict their CTRs for the users that have no historical click-through records. In this paper, we adopted BN (Bayesian network), an important probabilistic graphical model, as the framework for representing and inferring the similarity and the corresponding uncertainty of the behaviors in ad search of different users. First, we constructed the BN to reflect the similarity between users by means of statistic computations on the historical records of users ad search. Then, we measured the behavior similarity between the users with click-through records and those without records quantitatively based on the mechanism of BNs probabilistic inferences. Consequently, we predicted the CTRs of ads with respect to the users without historical click-through records, in order to provide a metric for ad recommendation. We made experiments on the training data of Tencent CA from KDD Cup 2012-Track 2 and tested the effectiveness of our methods.
Ant colony optimization algorithm for computing resource allocation based on cloud computing environment (Chinese)
HUA Xia-yu, ZHENG Jun, HU Wen-xin
[Abstract](4570) [PDF 1353KB](5770)
Abstract:
A new allocation algorithm based on Ant Colony Optimization (ACO) was established to satisfy the property of cloud computing. When start, this algorithm first prognosticated the capability of the potential available resource nodes, then analyzed some factors such as network qualities or response times to acquire a set of optimal compute resources. This algorithm met the needs of cloud computing more than others for grid environment with shorter response time and better performance, which were proved by the simulation results in the Gridsim environment.
Online advertising systems and related technology evolution
SONG Le-yi, GONG Xue-qing, ZHANG Rong, LIU Peng
[Abstract](4443) [PDF 1590KB](5604)
Abstract:
This paper introduced the background and related techniques of online advertising market. While different types of online ads may imply different computational advertising techniques in the backend system, this paper provided a rational classification method of online advertising formats. The category of online advertising given in this paper covers existing and potential types in the domain. Further, the advertising platform have evolved in several major phases or generations, particularly ad server, ad network and ad exchange. We showed the system architectures of the advertising systems mentioned above, by discussing the main function modules and interfaces. Our work aims to give a comprehensive and detailed description of the online advertising systems from the view of computation. Besides, the surveys in our work can provide essential background knowledge for computational advertising related research.
Research of large scale graph data management with in memory computing techniques
YUAN Pei-Sen, SHU Xin, SHA Chao-Feng, XU Huan-Liang
 doi: 10.3969/j.issn.1000-5641.2014.05.005
[Abstract](1623) [PDF 2216KB](4856)
Abstract:
Graph is an important data model, which can describe structural information including dependent relationship, such as transportation network, social network and webpage hyperlink. Management of big graph brings challenges for traditional techniques, however, distributed cluster provide platform and techniques for this problem. Nowadays, the ratio of performance and price of memory promote rapidly, while demand of applications of highperformance, inmemory computing for massive data management is becoming popular. The storage and evaluation of massive graph requires highperformance platform. In this context, its significant for studying graph data management with inmemory techniques. This paper surveyes key techniques of management of massive graph data, and researched graph data management of inmemory computing techniques,and finally summarizes the paper.
Research status and development studies of motion sensing technology
ZHANG Shi-chao, QIAN Dong-ming
[Abstract](1902) [PDF 1021KB](4854)
Abstract:
This thesis introduced the basic concepts and development of the human-computer interaction technology, as well as its applications in education and related areas. On this basis, Kinect would be used as a case study, including its application in the data of the depth, and skeleton tracking.
Research on the framework of specification for e-Textbook and e-Schoolbag
WU Yong-he, ZHU Zhi-ting, HE Chao
[Abstract](5244) [PDF 2795KB](4512)
Abstract:
With the development of information technology, the e-Textbook and e-Schoolbag is received more concerns from the community, its promotion and popularization is becoming the trend. First, this paper analyzes the demand of e-Textbook and e-Schoolbag from perspective of research on framework of standards. Then it describes the framework of e-Textbook and e-Schoolbag, including conceptual model, system framework model, hierarchy diagram for e-Textbook and e-Schoolbag system and function model. At last, it gives architecture of standards for e-Textbook and e-Schoolbag and profiles of related standards for e-Textbook and e-schoolbag.
Towards the next generation of mobile recommender systems
SONG Le-yi, XIONG Hui, ZHANG Rong
[Abstract](3845) [PDF 392KB](4407)
Abstract:
Recommender systems aim to identify content of interest from overloaded information by exploiting the opinions of a community of users. Due to the complexity of spatial data and the unclear roles of context-aware information, developing personalized recommender systems in mobile and pervasive environments is more challenging than developing recommender systems from traditional domains. This paper introduced classic recommendation techniques and unique features in mobile recommender systems, as well as the challenges in mobile enviroment. Based on two cases, taxi driving route recommendation and personalized travel package recommendation, we formulated the mobile sequential recommendation (MSR) problem and constrained travel recommendation. Finally, we gave a brief solution of the mobile recommender problem respectively.
Survey of online advertising target
GUO Xin-yu, LIU Peng, ZHOU Min-qi, ZHOU Ao-ying
[Abstract](3167) [PDF 1139KB](4390)
Abstract:
Online advertising has sprung up and shown its diversity for decades. With the rapid increase of online advertising markets,a growing numbers of advertisers want to deliver ads related to their products or services to specific users with less expenditure. They expect these users have great interest in their products or services and have good intersection with ads(users see the ads, click it, registration or buy the products). Thus the concept of advertising target is proposed. This chapter discusses several classification of advertising target and for each category we elaborate on its application scenarios. We then summary and contrast the important advertising target methods and models used in recent years.
Simulator for hybrid memory architecture
LIU Dong, ZHANG Jin-Bao, LIAO Xiao-Fei, JIN Hai
 doi: 10.3969/j.issn.1000-5641.2014.05.011
[Abstract](1973) [PDF 1508KB](4381)
Abstract:
This paper proposed a method for building a simulator for hybrid memory architecture based on gem5. When building, this method first added a hybrid memory controller between the memory bus and the memory model, then introduced the nonvolatile memory model of NVMain and hooked it up to the the newly added hybrid memory controller along with the native DRAM model of gem5. This method could achieve the goal of building a simulator for hybrid memory architecture, which was proved by the experiment results.
Young type inequalities for matrices
HU Xing-kai
[Abstract](2955) [PDF 144KB](4294)
Abstract:
First, some Young type inequalities for scalars were given. Then on the base of them, corresponding Young type inequalities for matrices were established.
Survey of resource uniform management and scheduling in cluster
LI Yong-Feng, ZHOU Min-Qi, HU Hua-Liang
 doi: 10.3969/j.issn.1000-5641.2014.05.002
[Abstract](1679) [PDF 1403KB](4288)
Abstract:
With the rapid development of Internet and the coming of big data, resource management system, a thin resource sharing layer that enables sharing cluster across diverse cluster computing frameworks, by giving frameworks a common interface for accessing cluster resources. For powering both large Internet services and a growing number of dataintensive scientific applications, cluster computing framework will continue emerge, and no framework will be optimal for all applications. Therefore, multiplexing a cluster between frameworks makes significant difference. Deploying and running multiple frameworks in the same cluster, improves utilization and allowing applications to share access to large datasets that may be costly to replicate across clusters. This paper is aimed to illustrate current major techniques of resource management and scheduling in cluster, including resource representation model, resource allocation model and scheduling policy. Finally, current prominent solutions, which have been developed and used by many companies, will be demonstrated, and we then summary and contrast these solutions used in recent years.
Analysis of tidal characteristics of the tide gauges in the Changjiang Estuary
YANG Zheng-dong, ZHU Jian-rong, WANG Biao, LIN Tang-yu
[Abstract](6510) [PDF 1190KB](4258)
Abstract:
Based on the measured water levels at Hengsha, Majiagang, Baozhen and Yonglongsha tide gauges in 2009, the tidal temporal and spatial variations, tidal constituents, tidal form and distortion at these gauges in the Changjiang Estuary were analyzed. There exist tidal daily inequalities that mainly occur during high tide levels, and are more significant during neap tides than spring tides in March and September while are more significant during spring tides than neap tides in June and December. The monthly maximum and minimum tidal ranges in each month at the tide gauges were given out statistically. The tidal range in the estuary varies monthly with two peaks: the maximum tidal range reaches the maximum values in March and September, and reaches the minimum values in June and December. The minimum tidal range reaches the maximum values in June and December, and reaches the minimum values in March and September. The tidal range in the South Branch reduced toward upstream due to the river discharge and friction. The tidal range at Yonglongsha tidal gauge is the largest among the 4 tidal gauges because the North Branch has small river discharge division ratio and funnel shape bathymetry. The tide is mainly composed by the 4 semi-diurnal tidal constituent (M 2、S 2、N 2、K 2), 4 diurnal tidal constituent (K 1、O 1、P 1、Q 1) and 3 shallow water tidal constituent (M 4、MS 4、M 6). The semi-diurnal tidal constituents M 2 and S 2 are the predominant ones, and the shallow water tidal constituents M 4 and MS 4 are apparent due to the shallow water in the estuary. The tidal form number in the South Branch is larger than 0.25, indicating where the tide is an irregular semi-diurnal tide type there, and is smaller than 0.25 in the North Branch, indicating where the tide is a regular semi-diurnal tide type. The tidal distortion coefficients in the 4 tidal gauges are all larger than 0.1, indicating that the tide at the tide gauges has significant distortion in the Changjiang Estuary, especially at Yonglongsha in the North Branch with tidal distortion coefficient 0.173.
Development of parallel computing models in the big data era
PAN Wei, LI Zhan-Huai
 doi: 10.3969/j.issn.1000-5641.2014.05.004
[Abstract](1460) [PDF 459KB](3982)
Abstract:
In the era of big data, the changing of the constraints gives the parallel computing opportunities and challenges for developing. This paper reviewed the new progress and changes of the parallel computing; combining with the effects of the hardware environments, computing pattern, application requirements on the parallel computing, the relevant research on batchoriented parallel computing model, streamingoriented parallel computing model, graphoriented parallel computing model and inmemory parallel computing model are summarized; Finally, the future development trends are evaluated.
Antiproliferative and apoptotic activities of novel curcumin analogs in human liver cancer cell lines
LI Yu-bo, WEN Ying, MA Ming-liang, WU Liang-chun, WEN Ke, ZHAO Zheng
[Abstract](2568) [PDF 2235KB](3947)
Abstract:
Antiproliverative and apoptotic activities of the novel curcumin analogs (CCM series) against human liver carcinoma Bal-7402 and SMMC-7721 cells were investigated by MTT assay. The cell cycle distribution and apoptosis of SMMC-7721 cells induced by CCM-5 and CCM-14 were analyzed using flow cytometry. The expressions of caspase-3 and its activated form p17 in SMMC-7721 cells were further determined by western blot. CCM-5 and CCM-14 exhibited, in a concentration-dependent manner, the stronger antiproliferative role than those of curcumin and the other CCM compounds. Their apoptotic effects on the SMMC-7721 cells were also found to be significantly elevated as compared with the control group (P0.01). Cell cycle distribution appeared that, as the concentrations of the compounds increased in SMMC-7721 cells, the G0/G1 phase cells decreased while the S phase and the G2/M phase cells, and the SubG1 peak increased. Furthermore, both CCM-5 and CCM-14 could activate caspase-3 expression in the SMMC-7721 cells. Collectively, our data suggest that CCM-5 and CCM-14 can restrain proliferation and promote apoptosis in SMMC-7721 cell, and the molecular mechanism underlying these actions against the cancer cells of the compounds may involve in the activation of caspase-3.
Accurate eye location in near-infrared images based on ellipse fitting
JIN Jun-cai, TONG Wei-qing, LIANG Xiao-ni, CHEN Qiang,  MEI Yue-ping, LIU Dan
[Abstract](2672) [PDF 3011KB](3863)
Abstract:
This paper presents a novel approach to precisely locate eye position in near-infrared facial images. In this approach, we first determine the face region and initial eye position using face detection classifier based on Haar features and AdaBoost algorithm. Then we detect the eye edge in the eye region using Sobel operator, fit it into an elliptical contour. Finally, the center point of eye is located by the center of the fitted ellipse. With 120120 normalized face images, the experiments show that the proposed approach is accurate. The average error is less than 1.5 pixels and the processing time is about 7 ms.
Numerical simulations of effects on urban PBL characters with landuse categeories modification
ZHANG Chi, SHU Jiong
[Abstract](4111) [PDF 1102KB](3827)
Abstract:
ENVI, IDL, GIS and aerial photographs were used to modify landuse data in ARW-WRF within Shanghai area. Firstly, grids were gained with GIS into the same resolution with the input data in WRF, which is too old for present landuse situation in Shanghai. Secondly, irrigated cropland and pasture, grassland, shrubland, loamy sand and silt were partly changed into urban and built-up land grid by grid, so as to be more closer to real situation, and the distribution of buildings was gained, helping to reach more accurate roughness value in UCM according to the 24 landuse categories defined in WRF model. Lastly, both modified and original data were input into WRF in case simulations. The wind field, temperature, and other characters of PBL in spring of Shanghai were gained in the simulation results. It shows that because of landuse types modification, horizontal wind velocity decreases obviously, displaying the urban dragging effects. Meanwhile, the vertical wind velocity increases, being greatly affected by surface warming effects. The higher temperature centers appear in the downwind direction by the effects of surface wind fields. Surface temperature and PBL height are both closer to observation values. The results lead us to discuss the importance of landuse categories input in models, and some other possible reasons causing the difference were mentioned.
Application of stationary technical indicator in high-frequency trading based on MACD
BAO Si, ZHENG Wei-an, ZHOU Yu
[Abstract](4095) [PDF 4857KB](3724)
Abstract:
In recent years, the rapid development of the high-frequency trading in the global financial market causes the extensive concern of the financial world. Because of the ``high frequency'' character, the high-frequency trading cannot be implemented by manual operation, but only with the help of computer programming trading system. Therefore, building a reasonable model of high-frequency trading strategy is necessary. MACD is a very important and commonly used technical analysis indicator in the stocks, futures, foreign currency exchange market, it is commonly used to judge the buying or selling time, and track the running trend of price of assets. In this paper, we define a new stationary technical indicator $\widehat{\rm MACD}_t$ based on MACD indicator, which is suitable for high-frequency trading strategy modeling. We also prove the stationarity of $\widehat{\rm MACD}_t$ under the hypothesis of stationarity of the increments of logarithm price process. Finally, we construct a high-frequency trading strategy based on $\widehat{\rm MACD}_t$ and test its effectiveness and profitability by using real market high-frequency data. All those put forward a new kind of thought in high-frequency trading.
A general decellularization method for preparing vascular scaffolds from blood vessels of different types, diameters and wall-thicknesses
ZHANG Hong-xia, ZHAI Wan-yin, ZHANG Hong-feng
[Abstract](2613) [PDF 5808KB](3670)
Abstract:
This study was to build a general decellularization method by combining trypsinization with repeated frozen/thawing treatment for different types of vessels including saphenous vein, carotid artery and aorta. Saphenous vein, carotid artery and aorta were decellularized by trypsinization and repeated frozen/thawing treatment. The efficiencies of cell removal and extracellular matrix (ECM) integrity were examined by Hematoxylin and eosin staining, Masson Trichrome staining and Weigerts staining. A quantitative means based on image analysis software was used to quantify the ECM preservation. Scanning electron microscopy was used to show the extracellular matrix integrity. Histology staining and quantitative analysis demonstrated trypsinization with repeated frozen/thawing treatment decellularized the saphenous vein, carotid artery and aorta completely. The ECM structure was optimally preserved and integrity. Scanning electron microscopy examination also showed the ECM was well-preserved and the fibers were dense and orderly. The present results revealed that the trypsinization with repeated frozen/thawing method is a promising one for preparing decellularized vascular scaffolds of different types, sizes and wall-thicknesses of blood vessels.
Research on the standards for the Internet of Things in education
FENG Xiang, JIANG Xin, WU Yong-he
[Abstract](3355) [PDF 799KB](3636)
Abstract:
This paper introduced the concept and history of the Internet of Things and analyzed its application in education and proposed research ideas. Based on the perspective of a typical three-tier, collection of the standards and key technology were summarized . Finally, combining the features and application mode in education, we summarized the metedata of intelligent educational terminals and established uniform standards. The results will be useful to educational service industries.
Study and improvement of oil spill simulation methods
LIU Weifeng, SUN Yinglan
[Abstract](4083) [PDF 1753KB](3561)
Abstract:
Three oil spill models were briefly reviewed. And based on the analysis of problems and defects existing in “Oil Particle” approach, a “TwoStep” method was put forward for oil spill simulation. The method divides oil spill movement into two steps: selfexpansion and turbulent expansion. The former step was handled by refinement of Fay’s equations, while the latter was handled by “Oil Particle” approach. Numerical experiment results show the “TwoStep” method can make up the shortcomings of “Oil Particle” approach and accords with the reality that spilled oil has different diffusion mechanism in the process of movement. 
Improved collaborative filtering algorithm based on usersimilarity
WANG Wei, ZHENG Jun
 doi: 10.3969/j.issn.1000-5641.2016.03.007
[Abstract](1167) [PDF 1219KB](3546)
Abstract:
Collaborative filtering is widely accepted and applied currently as one of the most popular personalized recommendation methods. It is an implementation method based on content that has considerable advantages in accuracy. The core issue of collaborative filtering is how to work out the calculation of similarity. In this paper, we introduce the traditional collaborative filtering algorithm and make similarity calculation more accurately by optimizing the traditional formula of similarity. Experimental results show that the optimized algorithm can improve the accuracy of the recommendation and reduce the MAE (Mean Absolute Error, MAE) efficiently.
Optimum design of LLC resonant converter based on complex method and its realization
GUO Wen-tao, HE Yi-gang
[Abstract](2000) [PDF 806KB](3513)
Abstract:
In the process of optimization, the $Q$ factor of the converter, the $h$ ratio of magnetizing inductance to resonant inductance and the maximum flux $B_{\rm max}$ were chosen as the optimal parameters, the details on the power loss of the converter was presented, the boundary conditions was deduced and the process of getting optimum solution was proposed. Finally, a three-hundred-watt prototype was build; the theoretical and experimental comparison result verified the feasibility and accuracy of the design method.
Design of the technical specification for e-Schoolbag terminal
QIAN Dong-ming, GUAN Jue-qi, GUO Wei
[Abstract](3908) [PDF 832KB](3502)
Abstract:
With the development of information technology, e-Schoolbag has become a popular research and application field in digital education. Through the evolution of concept, the change of attention and the development of education, the paper gives a new understanding of e-Schoolbag and focuses on the design of the technical specification for e-Schoolbag terminal. On the basis of the research situation in domestic and international, it concerns for the usage of users, security of applications, reliability of terminal, universal design and builds technical specification for e-Schoolbag terminal from the three aspects of terminal hardware, operating system and instructional function. Finally, from the perspectives of manufacturer, related industry with e-Schoolbag and the reform of education, it gives the forecast of the significance of technical specification for e-Schoolbag terminal.
Recommendation in E-commerce
YU Wen-zhe, ZHANG Rong, WANG Li
[Abstract](3319) [PDF 1458KB](3487)
Abstract:
For e-commerce sites, in order to promote the development and win more benefits, attracting and keeping the customers becomes very important. One of the most useful technologies is recommendation algorithms. In e-commerce sites, sidebar advertising is a common form of recommendation, which can be divided into three main categories: content-based, collaborative filtering and hybrid recommendation algorithms. However, current recommendation algorithms are challenged by new application requirements, such as diversification, personalization, intelligentization and timeliness. It is urgent to design new algorithms to meet these requirements.
Environmental impact assessment of Qingcaosha Reservoirconstruction project in the Yangtze Estuary
ZHANG Hongwei, WU Jian, CHE Yue, LI Wei, TONG Chunfu
[Abstract](5181) [PDF 3244KB](3465)
Abstract:
Based on historical and 2005-2006 field survey data, environmental impact assessment of Qingcaosha Reservoir construction project in the Yangtze Estuary was carried out. Results show that water quality in Qingcaosha is good, and the main indicators of water quality can meet the class Ⅱ of national surface water standard. There are 22 common types of plants in the study area with a vegetation cover of 11.3 km2. The aquatic biodiversity is high, and freshwater species are the main types of aquatic ecology. River basin pollution emissions, upstream runoff water quality deterioration, major construction projects and estuarine saltwater invasion may impact water quality of the reservoir. Reservoir operations optimization, delineation of source water protected areas, environmental pollution control and compensation strategy should be taken to protect the Qingcaosha area.
Context aware computing(Chinese)
GU Jun-zhong
[Abstract](2970) [PDF 3326KB](3440)
Abstract:
An overview of the basic concepts concerning context aware computing and a survey of the up-to-date researches were presented in this paper. Context and its spectrum were well formed and defined. Based on the evolution of computing modes, context aware computing as well as context aware systems was analyzed. As application examples, realizations of location based service and context aware web searching were discussed.
Efficient implementation for LDA in Mahout
XU Bo-xi, HU Ning, CHEN Wen-bin, GAO Wei-guo, CHENG Jin
[Abstract](5033) [PDF 423KB](3386)
Abstract:
In a careful study of Latent Dirichlet Allocation (LDA) using Gibbs sampling and the MapReduce framework, an efficient implementation for LDA in Mahout was achieved. The experiments showed the high performance of this distributed parallel LDA program, and several issues about enhancing performance were discussed.
Belongingness of Chinese dialect speech recognition based on deep neural network
JING Ya-peng, ZHENG Jun, HU Wen-xin
[Abstract](1872) [PDF 1319KB](3327)
Abstract:
Based on the modified QuickNet software, we proposed a supervised DNN layerwise pre-training method for dialect speech recognition. The pre-training will start from a 3-layer neural network till the maximum layer, during which we will do supervised training. The initial weights of a new layer are composed of the partial trained weights of lower level network and the randomized weights closed to the output layer. Then we will do traditional back-propagation training when the initial weights of the maximum layer network are obtained. This method achieved a relatively higher recognition rate compared with normal neural network training and can be used in mobile speech recognition apps, the recognition of dialects speech and so on.
Simulation of circulation and sea temperature in the Northwest Pacific
SHEN Qi, ZHU Jian-rong, DUAN Yi-hong, SUN Ming-hua
[Abstract](3141) [PDF 5971KB](3318)
Abstract:
Based on the ECOM-si, the circulation and temperature in the Northwest Pacific were simulated. The model includes the water flux at the lateral open boundaries, sea surface wind stress, heat flux, evaporation and precipitation at sea surface and so on. The model validation shows that the simulated sea temperatures are consistent with the section data, which were measured by Japan in the Northwest Pacific in each month of 2008. The model reproduces the North Equatorial Current, which flows westward at the surface in the low latitude Pacific, Kuroshio, which is a strong western boundary current, the Taiwan Warm Current and Tsushima Warm Current, the Coastal Current and Yellow Sea Warm Current and so on. In addition, the sea temperature distribution in the Northwest Pacific as well as in the South China Sea, East China Sea and Yellow Sea is also simulated by this model.
Seedlings photosynthesis traits and non-structural carbohydrate storage of common species in Tiantong National Forest Park, Zhejiang Province
ZHAO Lei, YANG Hai-bo, WANG Da-li, ZHANG Na, WANG Xi-hua
[Abstract](3469) [PDF 742KB](3307)
Abstract:
The photosynthesis traits and the storage of non-structural carbohydrate (NSC) of twenty common plants seedlings were studied in this case. The results are as follows. There are lower light compensation point (LCP), lower dark respiration rate (Rd), higher apparent quantum efficiency (AQE) and maximum net photosynthetic rate (Amax) in the seedlings of evergreen trees; while the deciduous species show the opposite results. The light saturation point (LSP) of evergreen shrubs is higher than that of evergreen trees. And the other photosynthetic paramaters have no significant difference. Roots are the key place of storage of NSC. The contents of sugar, starch and NSC in root and sugar in stem of evergreen trees seedlings are significantly higher than that of deciduous species, but the contents of starch and NSC in stem have no difference between them. The contents of sugar and NSC in root and starch and NSC in stem of evergreen shrubs are greater than that of evergreen trees, but the contents of starch in root and sugar in stem have no difference between them. Light-demanding species or pioneer species are the type of fast-growth, low-storage, and strong shade-tolerant evergreen shrubs are the type of slow-growth, high-storage, and photosynthetic capacity and carbohydrate storage of the semi-shade-tolerant evergreen trees are medium.
Weighted finite difference methods for two-sided space-time fractional diffusion equations
MA Wei-yuan, LIU Hua
[Abstract](3381) [PDF 315KB](3129)
Abstract:
A weighted finite difference scheme was proposed in order to solve initial-boundary value problems of space-time fractional diffusion equations. Their stability was analyzed by means of discrete energy method. Using mathematical induction, we proved that the scheme was convergent under the same condition. Illustrative example was included to demonstrate the validity and applicability of the scheme.
Seasonal and interannual variations of the heat and salt transportsbetween Kuroshio and the costal oceans near China
SUN Shuangwen, WAN Biao
[Abstract](3666) [PDF 3151KB](3100)
Abstract:
The study was carried out using the Hybrid Coordinate Ocean Model. Both climatological and 10year (1990-1999) simulating results were used. According to the climatological results, the heat transport from Kuroshio to the East China Sea is maximum in winter, and minimum in summer. The transport to the South China Sea is always positive except in summer. The annual mean of heat transport to the East China Sea and South China sea is 1.67×1014 W and 1.5×1014 W. The salt transport changing trend is similar to the heat. According to the wavelet analysis of 1990-1999 simulating results, the transport to the East China Sea has a period of 4 to 7 years, and is negatively correlated with the nino 3.4 index. While the South China Sea transport’s period is 3 to 4 years, and also shows certain correlation with EL Nino.
Conformal transformation between some Finsler Einstein spaces
ZHANG Xiao-ling
[Abstract](1923) [PDF 176KB](3092)
Abstract:
Liouville's Theorem proved that the Euclidean space can be mapped conformally on itself only by a composition of M\{o}bius transformations. For Riemann spaces, Brinkmann obtained general results. Little work has been done on Finsler spaces. This paper, by navigation idea and properties of conformal map, proved that the conformal transformation between Einstein Randers (or Kropina) spaces must be homothetic.
 doi: 10.3969/j.issn.1000-5641.2015.z1.020
[Abstract](1377) [PDF 984KB](3027)
Abstract:
Dynamics reasons and temporalspatial variations of suspendedsediment condition in the sea area of Yangshan deepwater harbor
ZUO Shuhua, ZHANG Ningchuan, LI Be, YANG Hua
[Abstract](3245) [PDF 2456KB](2987)
Abstract:
The Yangshan deepwater harbor locates in the Qiqu Archipelago with many islands and tidal channels. The cyclic tidal flow with strong velocity of 1.0m/s is the major dynamic force for maintaining the stability of the way and the sediment in flow is always under the combining action of waves and tidal currents. The seabed evolution is aroused by suspended sediment transport. The suspended sediment concentration is more 1.0 kg/m3. Based on the measured data of Oct. 1996, 1999, 2004 and 2006, and the measured surface suspended sediment concentration data from 1998 to 2007, the change characteristic of suspended sediment concentration was analyzed. Moreover, it was discussed to the causes of the variation of suspended sediment concentration, 〖JP2〗the effect of suspended sediment diffusion of Changjiang river mouth to Yangshan, and the “channel effect” to high suspended sediment concentration in Yangshan sea areas.
From statistical arbitrage to big data study
ZHENG Wei-an
[Abstract](1907) [PDF 940KB](2922)
Abstract:
Big data is a hot term. However its strict theoretical basis has not been formed yet.The purpose of research in big data is from its application. From their mathematical formulation,big data and massive high-dimensional and high-frequency data have no big difference. From the statistical point of view, the big data study is to find a lower-dimensional stationary time series from the high-dimensional and high-frequency massive data, then use the law of large numbers(the ergodic theorem) to find the value of its application. In finance, that is just statistical arbitrage.
Improved LDA model for microblog topic mining
XIE Hao, JIANG Hong
[Abstract](3357) [PDF 1181KB](2886)
Abstract:
With the dramatic increase of Sina microblog users, microblog websites have been the platformsfor a wide spectrum of users to get information. Due to the fact that microblog is a special kind of text with the restricted length, traditional topic models could not be used to analyze the microblog content very well. RT-LDA, a microblog generation model based on LDA is proposed in this paper. Gibbs sampling is chosen to deduce the model, which can not only mine the topics of each microblog accurately but also induce the distribution of the concerned topics. RT-LDAs effective utility on topic mining of the microblogs is verified by the experiments on real data.
Construction of learning analytics system
MA Xiao-ling, XING Wan-li, FENG Xiang, WU Yong-he
[Abstract](2678) [PDF 5978KB](2798)
Abstract:
Learning Analytics (LA) has been applied to various learning environments. However, a complete and clear learning data system is needed. This study tried to provide an open and comprehensive LA system. Firstly, summary of recent researches and developments in this field was given, a number of important concepts were defined, and the interaction evolution of time, space and data of LAS was studied. Then the learning analysis system Universe of Discourse (LASUoD) including formalized modeling of LAS information space model [R,CR,MT,A,W,C] was analyzed. In order to achieve interoperability of LAS applications, the frame of learning analytics system ontology (LASO), data format of LA object and the profiles of LAS standards were proposed. Finally an LA application based on open source SAKAI was demonstrated.
De novo transcriptome analysis and the phylogenetic position of glass lizards
ZHU Jing-jing, LI Wan-shun, GAO Hong, XU Tong, BAO Qiu-ying, ZHENG Yong-xiang, ZHOU De-min, XIA Gang
[Abstract](2101) [PDF 1556KB](2791)
Abstract:
Glass lizards are a group of reptiles that resemble snake and possess many lizard's characteristics that contributed to its ambiguous taxonomy. Meanwhile, glass lizards were recorded to have many therapeutic applications in TCM. Hence, we present the sequencing, de novo assembly and annotation of transcriptome from \textit{Ophisaurus}\textit{ harti}'s gastrointestinal tract. A total 4.6~Gbp of high quality data was generated, 58~959 unigenes were assembled and 35~708 (60.56{\%}) unigenes were annotated to the public databases. To understand the evolutionary relationship among glass lizard, snake and lizard, ortholog gene families and phylogenic tree were performed, and the results all showed that \textit{Ophisaurus}\textit{harti} is more closely related to the snakes than to the lizard. A total of 10~613 cSSR markers from the \textit{Ophisaurus}\textit{harti} transcriptome were identified and 1~644 markers were obtained using at least one primer with a strict criterion. This is the first time to give insight into the transcriptome and phylogenetic evolution in \textit{Ophisaurus harti}. These sequences and markers will provide valuable sources for \textit{Ophisaurus harti} studies.
A linear compact scheme for the nonlinear Schr"odinger equation with wave operator
LI Xin, ZHANG Lu-Ming, CHAI Guang-Ying1
 doi: 2016.03.001
[Abstract](1110) [PDF 363KB](2776)
Abstract:
In this paper, a linear compact finite difference scheme is proposed for the nonlinear Schrodinger equation with wave operator (NLSEWO). Thus, the periodic initial value problem of the NLSEWO is solved. The unconditional stability and convergence in maximum norm with order O(h[4]+tau[2]) are proved by the prior estimations and the energy method. Those theoretical results are demonstrated by a numerical experiment.
Study on the mechanism of methylene blue degradation by TiO2 photocatalyst
ZHANG Dan, XU Bin, ZHU Pei-juan, LIAN Zheng-hao, ZHAO Ya-ping
[Abstract](2722) [PDF 2193KB](2774)
Abstract:
In order to carry out the study, the experiments of photodegradation of methylene blue under different conditions were conducted, using different kinds of free radical scavengers, such as (CH3)3OH, H2O2, KI, NaN3 and C6H4O2. The effects of these free radical scavengers were observed. The concentration of H2O2 generated during the photodegradation of methylene blue by TiO2 was also reported. And the results of these experiments indicated that the main active oxygen substances in the reaction are OH, O-2 and 1O2.
EcR-RNAi and azadirachtin treatments induced the abnormal proleg development in Spodoptera litura.
ZHAO Jin-cheng, WU Tian-min, LIU Li-hua, WANG Yang, HE Lin
[Abstract](1308) [PDF 2182KB](2761)
Abstract:
Ecdysone is the insect molting hormone which induces a series of events critical for ecdysis, beginning with the formation of a complex between ecdysteroid receptor (EcR) and its partner protein, ultraspiracle (Usp). We cloned a 600~bp partial cDNAs encoding 200 amino acids EcR protein by degenerate primers from the common cutworm, \textit{Spodoptera litura}, a destructive agricultural pest insect in East Asia. We used this fragment to design the EcR-dsRNA to interfere the corresponding gene to analysis the change in different development stages. Using the Azadirachtin (Az) feeding the RNAi injected larvae to observe the development difference with normal control. Results indicated that the EcR RNAi interference the normal ecdysis and result in incomplete pupal molt. In the Az treatment after EcR RNAi injection, the larvae stunt growth and development program were disturbed and observed abnormal proleg phenotype. We deduced that Az and EcR RNAi maybe influence the key genes and inhibit the ecdysone cascade modulate pathway, which result in the disorder of tissue remodeling in molting.
Ecological economic valuation of rubber plantation in Xishuangbanna(Chinese)
XIA Ti-yuan, WU Jia-yong, DUAN Chang-qun, DA Liang-jun
[Abstract](3690) [PDF 763KB](2748)
Abstract:
The valuation was made by using of market valuation method, shadow engineering method and opportunity cost method. The results indicated that the ecological economic value in unit area was 38 107 yuan/(hm2·a), and in 2005 total value was 49.54 billion yuan, which occupied 62.86% of total GDP in this area; the ratio of economical value and ecological value was 1.14∶1. The values of various services were ordered as follows: Carbon fixation and oxygen release rubber forest byproduct organic matter production water conservation nutrient cycling soil conservation; carbon fixation and oxygen release was 14 900 yuan/(hm2·a), nutrient cycling was 85 yuan/(hm2·a).
High availability solution of OceanBase
YANG Chuan-Hui
 doi: 10.3969/j.issn.1000-5641.2014.05.015
[Abstract](2606) [PDF 1451KB](2744)
Abstract:
Shared storage or masterslave replication is used in traditional RDBMS to achieve high availability. The first solution relies on high available hardware, and so are of high cost, while the second solution cannot meet the requirements of strong consistency and high availability concurrently. OceanBase combines cloud computing and database technology. Its high availability solution is based on Paxos protocol. This solution is built on top of commodity machine. It meets requirements of both strong consistency and high availability with low cost.
Connecting reading and learning: design of the information model of e-Textbook
GU Xiao-qing, FU Wei, QI Gui-chao
[Abstract](3465) [PDF 1053KB](2740)
Abstract:
With the development of personal digital terminal and the popularity of e-reading, e-Schoolbag has once again become a hot topic in the field of e-Learning. In this paper, we firstly analyze the demands of e-Textbook in the instrunction context, and then proposed the design of e-Text book information model which aims at connecting reading and learning, and hopefully to guide the design and developmentof e-Learningtextbooks.
Memory transaction engine of OceanBase
LI Kai, HAN Fu-Sheng
 doi: 10.3969/j.issn.1000-5641.2014.05.013
[Abstract](2392) [PDF 2582KB](2732)
Abstract:
OceanBase is a distributed scalable relational database.Its storage architecture is designed by separating baseline static data and increment dynamic data, whose memory transaction engine, namely Memtable, provide dynamic data storage, write, and query, clients wrote data to the inmemory data structure. Memtable and some transaction management structures together form the inmemory database engine, which can achieve the transaction ACID properties. Bybased multiversion concurrency control techniques to prevent reading and writing from blocking each other to achieve readonly transactions to meet thesnapshot isolationlevel; Provide multiwrite concurrency control by using classic rowlock technology to meet theread committedtransaction isolation level.
Response to the anthropogenic impact on heavy metals in the sediment core from the Swan oxbow in the middle Yangtze River
HE Rong, DENG Bing, DU Jin-zhou, WU Ying
[Abstract](2407) [PDF 1297KB](2687)
Abstract:
The chronological dating of the sediment core from the Swan oxbow of the middle Yangtze River in April 2007 was determined by the combination of excess 210Pb (210Pbex) profile and the sedimentary characteristics. Environmental changes in the upper and middle reach of the Yangtze River in China in the last 50 years have been recorded by the concentration of elements (K, Ca, Na, Mg, Al, Fe, Mn, Ti, Cr, Cd, V, Zn, Pb, Cu, Ni, Co, Cs, U, Ga, Ba, Sr) in the sediment core detected by ICP-AES and ICP-MS. The results demonstrated that the regional environment is subjected to the human activities and the channel migration of the Yangtze River. During 1950s~1990s, low concentration and scale of the metal/aluminum variation suggested that the elements was mainly controlled by the weathering of river basin and the sedimentary environment. Since 1990s, substantially increasing of heavy metals suggested heavier pollutant of the river basin resulting from both increasing of industrialization and hydraulic engineering construction of the river basin. The decreasing of sediment load of the Yangtze River from hydraulic construction practices in recent years potentially diminished self-purification of river, thus negatively impact on environment of river basin.
Subspace-supercyclicity and common subspace-supercyclic vectors
ZHAO Xian-feng, SHU Yong-lu, ZHOU Yun-hua
[Abstract](2272) [PDF 247KB](2669)
Abstract:
A bounded linear operator $T$ on Banach space is subspace-supercyclic for a nonzero subspace $M$ if there exists a vector whose projective orbit intersects the subspace $M$ in a relatively dense set. We constructed examples to show that subspace-supercyclic is not a strictly infinite dimensional phenomenon, and that some subspace-supercyclic operators are not supercyclic. We provided a subspace-supercyclicity criterion and offered two necessary and sufficient conditions for a path of bounded linear operators to have a dense $G_\delta$ set of common subspace-hypercyclic vectors and common subspace-supercyclic vectors.
Compatibility characteristics of acellular porcine heart valve matrix co-crosslinked with procyanidins and glutaraldehyde
MA Xu-bing, ZHAI Wan-yin, ZHANG Jia-min, ZHU Zi-yan, ZHANG Hong-feng, CHANG Jiang
[Abstract](5382) [PDF 3608KB](2660)
Abstract:
The clinical used bioprosthetic heart valves (BHVs) were prepared from biological tissues by glutaraldehyde (GA) crosslinking. But the clinical application of BHVs is limited mainly due to calcification, cytotoxicity and remaining immunogenicity. Procyanidins (PC) can crosslink acellular heart valve matrix (AHVM) through hydrogen bond formation and prevent AHVM from calcification. The aim of this study is to modify GA crosslinking method using PC co-crosslinking to produce a much ideal material with higher compatibility for BHV preparation. Porcine aortic AHVM was crosslinked by 8 mg/mL PC for 4 h and then by 1.25 mg/mL GA for 44 h. The co-crosslinked AHVM was tested for cytocompatibility, blood compatibility and immunogenicity. The results showed that the in vitro adhesion rate of valvular interstitial cells on co-crosslinked AHVM was increased by 59% (78.75%~19.75%)when compared with that of GA-crosslinking. There was no difference in hemolysis between co- and GA- or PC-crosslinked AHVM. The co-crosslinked AHVM exhibited significant anti-thrombosis effect ((19315.5) platelets) when compared with that of GA-crosslinked ((292.624.93) platelets). Furthermore, co-crosslinked AHVM displayed lower immunogenicity than that of GA-crosslinked ((49.336.3)% vs (95.275.26)%, cell adhesive rate). These results suggest that co-crosslinked AHVM has high potential to be used for preparation of BHVs.
Learning analytics system architecture based on big data technologies
FENG Xiang, YU Ming-hua, MA Xiao-ling, WU Yong-he
[Abstract](2752) [PDF 3106KB](2637)
Abstract:
First, this paper analyzed the demand and object of learning analytics in the e-Education. Then it introduced the technology of big data, designed learning analytics platform based on Hadoop, built intelligent digital education services supporting platform based on learning analytics, and illustrated the application cases of this technology scheme. Finally, the technical problems of Hadoop which still exist was pointed out, and their solutions was put forward.
Methods of extracting distribution information of plants at urban darken areas and repairing their brightness
ZHOU Jian-hua, ZHOU Yi-fan, GUO Xiao-hua, REN Zhen
[Abstract](2203) [PDF 5432KB](2604)
Abstract:
In the urban built-up areas with densely high-rising buildings, about 20% of landscape vegetation is growing at darken areas shaded by buildings or other higher plants. In order to drive a model of measuring captured carbon by remote sensing, one of the puzzles to be solved firstly is to separate and extract those plants at darken areas. So a new conception of NDUI (Normalized Difference Umbra Index) has been put forward here. With NDUI, the total area of landscape vegetation is extracted from an infrared remote sensing image by means of NDVI (Normalized Difference Vegetation Index), and then the plants at darken areas are separated from the total area through another segmentation threshold referring to NDUI. These separated plants at darken area can be enhanced with an algorithm of repairing brightness. It is demonstrated by experiments that the algorithm proposed here can work robustly to meet the requirement.
βCaMKII overexpression impairs long-term depression in dentate gyrus of mice
XU Hao, WANG Bo, DUAN Yan-hong, CAO Xiao-hua
[Abstract](2460) [PDF 1356KB](2592)
Abstract:
This experiment was designed to investigate the effects of the CaMKII on the long-term depression (LTD) in dentate gyrus(DG)by using the transgenic mice in which the overexpression of CaMKII is restricted to the DG area. Compared to the control group, the paired-pulse depression curve and voltage-current response in DG of transgenic mice didnt change, but the LTD was significantly reduced. These results suggest that overexpression of the CaMKII may impair the long-term depression without effect on the presynaptic function and passive properties of granule cells in DG area.
Electrical conductivity properties of modified polyacrylonitrile/MWNTs composites
ZHANG Jian, XU Xue-cheng
[Abstract](2245) [PDF 1824KB](2586)
Abstract:
The PAN was synthesised by solution polymerization, modified by heat-treatment and then blended with carbon nanotube to obtain the composites. The electrical conductivity of the composites increased by two orders of magnitude more than that unmodified. Fourier transform infrared spectroscopy (FTIR), Raman spectra and X-ray spectroscopy (XPS) were used to characterize the composites. The results showed that some nitrile were changed into imino, and the chain-like structure also transformed to the cyclic structure after heat-treatment. The strong - system was formed between -electrons of MWNTs and the modified PAN. The interaction between the modified polyacrylonitrile and carbon nanotubes was greatly enhanced. The electrical conductivity was highly improved.
Computational and experimental identification of novel microRNAs in rats
WANG Lin, ZHANG Shuang, DONG Su-zhen
[Abstract](2001) [PDF 893KB](2577)
Abstract:
The number of miRNAs in rat genome in miRBase is much less than that of mouse and human. One effective method to identify new miRNAs is to utilize the homolog- based bioinformatrical method. In this report, this method was applied to predict new miRNAs of rats. The known miRNAs sequences were downloaded from miRBase, and used as query sequences to search the rat genome at UCSC Genome Bioinformatics by BLAT analysis. New miRNAs were selected based on commonly- used miRNA standards. As a result, 45 new miRNAs were obtained. Nine of them were chosen to be validated by RT- PCR, and most of them were found expressed in brain, heart, lung, kidney, muscle, spleen, testis and liver. Based on the results, miRNA cluster analysis and miRNA gene family analysis were performed in rat genome.
Application of RBPs for the habitat assessment of Suzhou Creek
CAO Min, WU E-nuo, CHE Yue, CHEN Ting
[Abstract](4611) [PDF 1371KB](2570)
Abstract:
As an important part of river health evaluations, habitat assessment has received more and more attention. Practice progresses of foreign river habitat assessment are reviewed and the basic thinking with working procedure of habitat assessment in American Rapid Bioassessment Protocols (RBPs) is introduced in this paper. Then, an empirical study has been carried out on Suzhou Creek in Shanghai. The result indicates that: Suzhou Creek has been strongly affected by human activity, and its habitat quality varies mostly between better to bad levels. Scores of the habitat quality of main streams are close to that of branches, while habitat quality of upstream areas is better than that of lower-middle reaches areas, and rural areas is better than urban areas. Result shows that Rapid Bioassessment Protocols (RBPs) has important referential value to the river habitat assessment in China.
Den habitat selection of China bamboo-rat (Rnizomys sinehsis) in spring
YUAN Bao-dong
[Abstract](3217) [PDF 412KB](2556)
Abstract:
Den habitat selection of the China bamboo-rat (R. sinehsis) was investigated from January to April in 2009 in Yuanbaoshan Nature Reserve, Guangxi. Thirteen ecological factors were recorded in 10 m10 m plots of 85 samples, including 54 used samples and 31 unused samples. The data were analyzed by frequency analysis and Mann-Whitney U test. The results showed that the difference among the canopy density, the distance to human disturbance, the shelter of wind, the shrub density, the distance to shrubs, the elevation and the food abundance were significant (P0.05); while the difference among the water distance, the slope, the aspect, the slope position, the tree density and the tree distance were not significant (P0.05). The habitat selection shared the following ecological factors: the well canopy density, the well shelter of wind, the well food richness, the slope among 20 to 40 degrees,the aspect toward east or south,the slope position with uphill or middle place, the elevation more than 1 800 m, the tree density less than 30 ind./plot, the distance to tree about 2 to 5 m,the shrub density about 1 000 to 5 000 m, the distance to shrubs less than 0.1 m,far away to water( more than 500 m) and the human disturbance distance more than 1 000 m. Principle component analysis indicated that the shelter, the water, the geography, the human disturbance and the food abundance affected the habitat character of the China bamboo-rat in spring.
Query analysis for search engine in E-commerce Web sites
FENG Liang, SHA Chao-feng
[Abstract](1577) [PDF 530KB](2551)
Abstract:
In most E-commerce web sites, key word search is an important way for users to find commodities, and calculation of the term weights is a major step for search engine to process queries. In order to overcome the shortness of existing methods in calculation of term weights in query processing, this paper proposed a new method, which combines importance with relevance of terms when calculating term weights. It effectively improves the correctness of the determination of the term weights, and is practical and reliable.
Numerical study on the seasonal and interannual variations ofthe mixed layer depth in Japan/East Sea
ZHENG Peinan, WU Dexing, LIN Xiaopei
[Abstract](3448) [PDF 6324KB](2547)
Abstract:
Base on the Hybrid Coordinate Ocean Model (HYCOM), this paper simulated the three dimensional dynamic and thermologic structure of the North Pacific Ocean from 1981 to 2001. After verifying the validation of the model results, the mixed layer depth (MLD) field and its seasonal variation in Japan/East Sea (JES) as well as the interannual variation were analyzed. The analysis shows that there exists strong seasonal and interannual variations of MLD in JES; which can be seen as one of the noticeable hydrological phenomena there. The MLD is deeper in winter and shallower in summer. The variable range is from 10 meters to 100 meters. There exists both similarity and difference between seasonal and interannual variations of MLD in JES. The analysis shows that the topography, the current, the monsoon and the temperature gradient in JES work together, making the variation of MLD in JES.
Pricing extendible option under jump-fraction process
PENG Bin, PENG Fei
[Abstract](2217) [PDF 238KB](2530)
Abstract:
A valuation framework for extendible options is constructed when the underlying asset obeys a fractional process with jump. Under the risk neutral environment, an analytic formula for the call option with one extendible maturity is derived by solving the expected present value of cashflow and conditioning jumps for the underlying asset. Moreover, some special cases of the formula are discussed. These results are generalized to the option with$ M $extendible maturity. Its value will converge in the limit to the value of perpetual extendible option as the number of extendible maturity increases to infinite. Extrapolated technique with two points is presented to yield a simple and efficient computation procedure to calculate the limit. Numerical results are provided to illustrate provided that our pricing expressions are easy to implement.
Multiple solutions for ${\bm p}({\bm x})$-Laplacian problems in ${\bf R}^{\bm N}$
CHEN Zi-gao
[Abstract](3338) [PDF 221KB](2523)
Abstract:
By using the fountain theorem and the dual fountain theorem, respectively, the existence and multiplicity of solutions for $p(x$)-Laplacian equations in $\mathbf{R}^{N}$ were studied, assumed that one of the perturbation terms $f_1(x,u),\, f_2(x,u)$ is superlinear and satisfies the Ambrosetti-Rabinowitz type condition and the other one is sublinear. The discussion was based on variable exponent Lebesgue and Sobolev spaces.
Structure-conductive property relationship of polypyrrole
YU Bo, XU Xue-cheng
[Abstract](1959) [PDF 1700KB](2522)
Abstract:
Polypyrrole was synthesized by oxidative chemical polymerization. Samples presenting different conductivities were obtained by adjusting the preparing temperature. The polypyrrole samples have been investigated by means of four probe method, Solid state 13C NMR spectrum, XRD, FTIR spectroscopy, Raman spectrum and XPS, respectively. The experimental result suggested the fact that the conductivity of polypyrrole samples gradually decreases as the preparation temperature increases. The analysis indicates it is because the changing of internal structure follows the varying of external preparation conditions. The commonly structure of polypyrrole is a linear chain of monomers bonded by - carbons at a low preparation temperature. Through such a structure polypyrrole can form both a relatively planar configuration and a relatively planar conformation. This sort of structure provides the sample with a preferable regularity, a longer conjugated chain length and a higher conductivity. However, the ratio of - linkage drops as the preparation temperature increases, by which the structure of molecular is damaged, the degree of order declines. The carrier mobility of polypyrrole, as well as the conductive property, became lower.
Review of sediment ecological dredging in urban black-odors river treatment
CAO Cheng-jin, CHEN Zhen-lou, WANG Jun, HUANG Min-sheng, QIAN Chang-ping, LIU Lin
[Abstract](3010) [PDF 1748KB](2501)
Abstract:
Based on the latest research achievements, the common technology of sediment ecological dredging was integrated by condensing some key factors including technical characteristic, process, principle, parameter, using problems, and application prospect. The new integrating technology is expected to be a common technology of sediment displacement treatment. This study offers reference and consult to China urban river pollution controlling.
Present status and development of the birdwatching in mainland China
CHENG Yi-xin, WANG Jun-yan, HE Xin, MA Zhi-jun
[Abstract](2523) [PDF 1016KB](2501)
Abstract:
This study collected and analyzed data on the present status and development of the birdwatching societies, birdwatchers, and birdwatching activites in mainland China through the methods of questionnaire, interview, etc. The study shows that, during the last decade, birdwatching societies and birdwatchers have been growing rapidly. There are over 20 000 birdwatchers in mainland China, over 5 000 of which have joined local birdwatching societies. Birdwatching societies have carried out various activities, such as birding, public environmental education, bird survey, etc. The societies have also worked collaboratively with reserves/parks, NGOs, Schools and local governments. However, fund is the biggest challenge of them, and they need urgent help. This paper, based on the investigation, gives the following suggestions for the development of birdwatching societies: Enhance the level of internal organizational construction; improve the participation and ability of the members on birdwatching societies; strengthen cooperation with governments and media; promote birdwatching ecotourism and enhance the diversity of funding sources.
Comparison on analysis of 210Pb using alpha and gamma techniques
LIU Xuying, PAN Shaoming
[Abstract](3451) [PDF 1871KB](2478)
Abstract:
Eleven groups of results on activities of 210Pb from IAEA(International Atomic Energy Agency)for international comparison were analyzed to discuss the difference between two methods for 210Pb analysis: alpha and gamma spectrometry techniques. Consistence of the results by two techniques was discussed through linear regression analysis; consistence of the results by the same technique among different laboratories was also discussed; their availabilities and utilization ratios were compared, and then factors that influenced consistence and availabilities were discussed. Results showed that, there was a good agreement and strong linear correlation in the average results using two different techniques; however, there was significant difference among laboratories even using the same technique. Relatively, availability of results using alpha technique was higher than that of gamma spectrometry technique, but laboratories using gamma techniques were increasing annually. Low activity of 210Pb would affect consistence among laboratories negatively, especially for gamma techniques. Therefore, it was suggested that laboratory quality controls should be enhanced and comparisons among international and national laboratories should be put in an important place in order to improve the analysis quality of 210Pb and comparability among laboratories.
QR-code based design of supplementary book service platform
FENG Xiang, WU Yong-he, WANG Jian, REN You-qun
[Abstract](1760) [PDF 4263KB](2478)
Abstract:
This study applied two-dimensional code in the design of a supplementary book distribution system: used it as the entrance to the digital world, constructed a services platform, developed a mobile application for ubiquitous learning, and built a supplementary publishing ecosystem. The study connects supplementary books and digital supplementary resources seamlessly, providing better learning experience. The research result has been applied by the Press of East China Normal University in distribution of paper supplementary books and yield good results.
Meta-analysis of CYP1A1 polymorphisms and lung cancer risk among smokers
CAI Yan-yan, TAN Xiao-ming, ZHENG Hong-xia, GU Hai-ying, ZHAN Xiao-ying, WU Qi-han
[Abstract](3142) [PDF 1660KB](2467)
Abstract:
All of the publications were eligible from Medline and Pubmed databases and the information about relationship between CYP1A1 Ile462Val and Msp1 polymorphisms and lung cancer risk among smokers was summarized. Meta-analysis was performed using RevMan 4.2. 29 case-control studies were available. For Ile462Val, meta-analysis revealed that the risk of lung cancer among smokers with Val/Val and Ile/Val genotypes was 1.29 times of those with Ile/Ile genotype (P0.05) by the random effects model. There was no significant correlation between Msp1 and lung cancer among smokers or non-smokers. These results suggest that CYP1A1 Ile462Val polymorphism is related to the susceptibility of lung cancer among smokers.
High order interpolation function for surface contact problem
FENG Yun-Qin, HOU Lei
 doi: 2016.03.002
[Abstract](1057) [PDF 1924KB](2466)
Abstract:
This paper mainly adopts Lagrange bicubic shape function to construct interpolation function and uses finite element method to solve the coupling equations of surface contact. The Lobatto points are used to construct the interpolation nodes to avoid the Runge phenomenon. Higher shape functions and two different numerical integration methods are adopted to improve the accuracy of the numerical solution. According to the above analysis, this article uses Matlab program to simulate the deformation and stress changes in surface contact problem.
Strategy for online advertising based on fuzzily clustering Web pages
PENG Dun-lu, YAO Nan, XU Wen-jie
[Abstract](1612) [PDF 832KB](2455)
Abstract:
With the rapid development of online advertising, the competition in Ad marketing is becoming more and more intense. It is important to accurately target for enhancing the ROI of online advertising. This paper proposes the definitions of the eigenvector space and eigenvector model of web pages for online advertising.Based on these concepts, it presents a fuzzy vector representation and its generating method for online advertising web pages. To accurately target advertising, it exploits a fuzzy clustering approach to partition web pages. A group of experiments has been conducted to verify the advertising efficiency and effectiveness with the proposed approach.
Risk assessment of typhoon hazard factors in China coastal areas
NIU Hai-yan, LIU Min, LU Min, QUAN Rui-song, ZHANG Li-jia, WANG Jing-jing, XU Shi-yuan
[Abstract](4230) [PDF 1915KB](2454)
Abstract:
Three indexes were chosen to establish a hazard assessment index system and model from wind, rain and storm surges . Then in a GIS environment, the risk of typhoon hazard factors were assessed. The assessment result showed that the risk of typhoon hazard factors is higher in Hainan province and the coastal areas of Guangdong, Fujian, Zhejiang provinces; Shanghai and the coastal areas of Guangxi, Jiangsu provinces have medium risk of typhoon hazard factors together with the inland areas of Guangdong, Fujian, Zhejiang provinces; while in Beijing, Tianjin, Liaoning, Hebei, Shandong provinces and the inland areas of Guangxi, Jiangsu provinces, the risk is lower. The result is valuable to provide reference for China coastal areas to deal with disasters.
Long-term potentiation of prefrontal cortex in NR1 knockout mice
YANG Li-guo, ZENG Qing-wen, ZHANG Xu-liang, CAO Xiao-hua
[Abstract](2671) [PDF 1731KB](2448)
Abstract:
This study investigated the prefrontal synaptic plasticity of forebrain-specific NR1 knockout mice by using the vitro field potential recording technique. The results from the input-output and paired pulse depression curves suggest that the basal synaptic transmission is normal in the prefrontal cortex of NR1 knockout mice. Prefrontal long-term potentiation (LTP) induced by high frequency stimulation (two trains of 100 Hz with 1 s duration and 30 s interval) was abolished in slices of NR1 knockout mice. These results indicate that NR1 is critical in the induction of long-term potentiation in prefrontal cortex.
An upper bound for the vertex-distinguishing star edge chromatic number of graphs
LIU Xin-sheng, LU Wei-hua
[Abstract](2083) [PDF 197KB](2444)
Abstract:
The vertex-distinguishing star edge chromatic number of $G$, denoted by $\chi'_{\rm vds}{(G)}$, is the minimum number of colors in a vertex-distinguishing star edge coloring of $G$. The vertex-distinguishing star edge colorings of some particular graphs were obtained. Furthermore, if $G(V,E)$ is a graph with $\delta\geqslant 5$, and $n\leqslant \Delta^7$, then $\chi'_{\rm vds}{(G)}\leqslant 14\Delta^2$, where $n$ is the order of $G$, $\delta(G)$ is the minimum degree of $G$, and $\Delta(G)$ is the maximum\linebreak degree of $G$.
Assessing the impacts of climate changes on thestreamflow of Naoli River
YAO Yunlong, Lv Xianguo, WANG Lei
[Abstract](3276) [PDF 1501KB](2442)
Abstract:
In this paper, the nonparametric MannKendallSneyers test was used to analyze the stationarity of the annual streamflow records of Baoqing hydrological station and Caizuizi hydrological station in Naoli River watershed from 1956 to 2005. The empirical model which shows the relationship between rainfall and streamflow was established, and the model was used to assess the impacts of climate changes and human activities on annual streamflows. The result shows that the whole period of annual streamflows from 1956 to 2005 can be divided into two phases: baseline period (1956—1967) and changed period (1968—2005). During the changed period,the interannual and intraannual variability of streamflows changed significantly, and the interannual variability of streamflows was mainly caused by human activities, about 40 percent was caused by climate changes.
Performance of fluoride removal by Fe(Ⅲ)-modified resin
WU Cheng-cheng, TIAN Hao-ting, ZHAO Ya-ping
[Abstract](3215) [PDF 3310KB](2435)
Abstract:
Fluoride adsorption on Fe(Ⅲ) modified macroporous sulfonic acid resins has been investigated through batch experiments. The adsorption of fluoride on Fe(Ⅲ)-modified resins is independent of pH value,and the saturated adsorption capacity increase with the increase of temperature. The adsorption thermodynamics follows the Langmuir and Freundlich isotherm. The adsorption kinetic follows Elovich kinetic and the pseudo-second-order kinetic equation. The common foreign ions in drinking water do not obviously influence on the adsorption capacity of fluoride. The adsorbent shows good dynamic performance in column experiments. Results show that the Fe-modified resins would be a promising adsorbent for fluoride removal from drinking water.
Current and future trends of international standards for e-Education technology: ISO/IEC JTC1 SC36, its 24th plenary, WG meetings and open forum
WU Yong-he, GUO Wei, ZHU Zhi-ting
[Abstract](2099) [PDF 1069KB](2432)
Abstract:
First, it makes a brief introduction about ISO/IEC JTC1 SC36 and its seven working groups (WGs), describes the current development of standards for e-Education technology, emphatically analyzes the relationship among the WGs; introduces the progress in the 24th SC36 Plenary and WG meetings; then it summarizes the concerns on thematic reports and proceedings of open forum, and anticipates the future development. Finally, integrating analysis of the whole meeting, it gives the forecast of international standards, emphatically analyzes the new relationship of the WGs.
Micopolarization elements on p-aminoazobenzene film induced by femtosecond laser pulses
PENG Xue-ying, JIA Tian-qing, SUN Zhen-rong
[Abstract](1925) [PDF 1860KB](2420)
Abstract:
Fabrication of nanostructures on a surface of p-aminoazobenzene polymer film illuminated by 400 nm and 800 nm femtosecond laser was studied. Ripples with periods of 210 nm and 500 nm were produced by linearly polarized 400 nm and 800 nm femtosecond laser pulses, respectively. The periods of the ripples increase with increasing the intensity of incident laser pulses. The interference of this diffracted optical wave with the incident beam gives rise to optical interference ripples. Gradient of surface tension is induced by the surface temperature gradient caused by the interfered light. The gradient of surface tension gives rise to the periodical ripple structures. Thick polymer film was made and illuminated by 400 nm femtosecond laser,and periodic nanostructures were also been observed.
vec estimates of solutions to the Cauchy problem of[2mm] one-dimensional convection-diffusion equations
ZENG Yan, XIN Gu-Yu
 doi: 2016.03.003
[Abstract](1077) [PDF 250KB](2419)
Abstract:
This paper investigated the estimates of solutions to one-dimensional convection-diffusion equations frac{partial c}{partial t}+ufrac{partial c}{partial x}=Dc_{xx}+c_{xt}-(c{2})_{x}, using Green's function method, frequency decomposition and energy estimates. We found that the decay rate of the solution is the same as that for heat fusion operator
Wave crestlength distribution based on numerical simulation and SAR
LI Cuilin, YU Dingyong, GAO Yangyang
[Abstract](3511) [PDF 2903KB](2417)
Abstract:
The progress in the research of the statistical distribution of wave crest characteristics and the mechanism of synthetic aperture radar (SAR) wave image were reviewed in this paper, and the information of crest length were obtained by applying the linear accumulative method to the simulation of random wave crest. The comparison of crest length distribution shows there is a goodness of fit between numerical simulation and the observation of SAR. It validates the technique of numerical simulation and deduces a probability equation of crest above certain length.
Star edge coloring of $d$-dimensional grids
DENG Kai, LIU Xin-sheng, TIAN Shuang-liang
[Abstract](2259) [PDF 243KB](2413)
Abstract:
The star chromatic index of graph $G$ is denoted by $\chi_{s}^{\prime}(G)$. In this paper, we studied the relationship between $\chi_{s}^{\prime}(G)$, $|V(G)|=\nu$, and $|E(G)|=\varepsilon$, and proved that $\lceil\frac{8\varepsilon}{3\nu}\rceil\leqslant\chi_{s}^{\prime}(G)$ for $\Delta(G)\geqslant2$. The star chromatic index of 2-dimensional grid was obtained. We also got the attainable bounds for the star chromatic index of hypercubes and $d$-dimensional grids.
Analysis of hydrodynamics around the Hengsha Shoal of the Yangtze Estuary and its adjacent region
LI Shen-duo, ZHU Qiao-yun, YU Zhi-ying
[Abstract](1638) [PDF 6361KB](2399)
Abstract:
The dominant controlling dynamics for the Changjiang Estuary is the interaction between the strongly periodic tide oscillation and the weakly periodic Changjiang River runoff. The astronomical tide in this region is the combination of the semidiurnal and diurnal tides, which produces the shallow tide wave due to the nonlinear interaction between these tide components. Therefore the tidal asymmetry in one period is subsequently induced. The tide wave mainly flow along the coasts with the northward direction, and turn to the northwestern direction into the North Passage and North Channel. The studied region, Hengsha Shoal, is characterized as the shallow shoals and deep channels, where is the buffering zone for river mouth and open ocean. This complex bathymetry produces the motions of the tide wave and runoff. The current in the channel and north region of Hengsha Shoal has the alternating pattern. And the significant rotating current dominates the south area, which plays an important role on the stability of the local bathymetry and the strong cross-channel current. Since the Changjiang Rivers runoff flow eastward, and float on the surface in this region, producing significant two-layer system in the vertical direction.
Isolation and identification of the fungi which can convert Panax Notoginseng extract into ginsenoside Rg3
WANG Qing, YUAN Ping, MAO Ren-gang, WANG Ju-yong, ZHENG Zhan
[Abstract](2284) [PDF 1605KB](2397)
Abstract:
Twenty-three strains were isolated from soil where ginseng grew. The Panax Notoginseng extract were analyzed by TLC and HPLC. There were nine strains which can converte Panax Notoginseng extract into highly active ginsenoside, among which the TR-20 was the best one. Moreover, the TR-20 can convert Panax Notoginseng extract into ginsenoside Rg3(190.2 mg/L). The TR-20 was Aspergillus (Aspergillus sp.) with observation of morphology and cultural characteristics.
Property of an orthogonal projection matrix
DU Kun, GU Gui-ding
[Abstract](7565) [PDF 210KB](2395)
Abstract:
In this paper we showed that for an orthogonal projection matrix with rank $k$, there exists an principal submatrix with order $k$ of the matrix, such that its Rayleigh quotient has a positive lower bound. The proof was made by using the relation of the singular values, eigenvalues and norm of matrices, as well as the properties of unitary matrix and compound matrix.
Modeling of seawater reflectance in the Yangtze Estuary and the adjacent sea
HONG Guan-lin, SHEN Fang, SHEN Hong
[Abstract](2825) [PDF 3551KB](2393)
Abstract:
The optical properties of the Yangtze Estuarine waters were discussed based on two investigations conducted respectively in August and November of 2009. It was found that the water-leaving reflectance spectra in August and November presented four types caused by different chlorophyll-a concentrations, suspended sediment concentrations and colored dissolved organic matters (CDOM). The relationships between chlorophyll-a concentration and absorption coefficient of the pigment particles were built by two ways, and two models used to simulate the reflectance spectra were established by using the parameterized optical properties, the RMSE of these models being 0.004 4 and 0.004 5, respectively. The accuracy of the model can be improved by classifying the concentrations of chlorophyll-a and suspended sediment, the RMSE was improved to 0.003 5.
Study on the spatial pattern of Shanghai crime based upon GIS
ZHONG Hai-dong, WU Jian-ping, YU Bai-lang, WANG Zhan-hong
[Abstract](3070) [PDF 3172KB](2387)
Abstract:
After discussing the advantages of using GIS in urban crime research and reviewing the research status based on GIS in home and abroad, this paper studied then the spatial pattern of Shanghai crimes (robbery, racketeering, theft and fraud) by applying ArcGIS, based on crime data of 2006 from Shanghai Public Security Bureau. The research shows there is an obvious concentration characteristics of the crime events within the outer ring road of Shanghai, especially in the central urban space, and there is a significant time pattern of Shanghai crimes, with the hot spot in the Peoples Square. The result can be used as a useful support or basis for policy makers and the police departments for active crime attacks and preventions.
Diversity, spatial pattern and dynamics of vegetation under urbanizationin Shanghai(Ⅷ): Distribution of native terrestrial wild plants and their applications to urban greening in Shanghai
TIAN Zhi-hui, CAI Bei-ming, DA Liang-jun
[Abstract](2961) [PDF 1161KB](2378)
Abstract:
Through consulting related data, a list of 534 native terrestrial wild plants species in Shanghai was built, which belonged to 65 families and 284 genera, and the distribution status of wild plants in different lands was investigated along a urban-suburban-rural gradient in Shanghai area, Sheshan mountain and Dajinshan island, expounding the diversity of terrestrial wild plants influenced by urbanization. By analyzing the families and genera compositions, areal types, life form and distribution status of species, the decisive role of the geographic location, size, habitat type and degree of urbanization for the composition of wild plants was illustrated. According to the distribution of species and adaptation to the environment, the native terrestrial wild plants in Shanghai were divided into five weeds types, such as eurytopic type, urban type, suburban type, suburb type and wild type. The significance and application of native wild plants in urban greening of Shanghai were analyzed.
Two formulations and solutions of the inverse problems for Lie symmetries in dynamics of a Birkhoffian system
LONG Zi-xuan, ZHANG Yi
[Abstract](2081) [PDF 251KB](2373)
Abstract:
First, the determining equations, the structure equations and the conserved quantities of Lie symmetries for a Birkhoffian system were given; then two formulations and solutions of the inverse problems of Lie symmetries for the system were presented. The results show that the same Birkhoffian(Birkhoff's functions) and first integral can correspond to different Birkhoff's functions(Birkhoffian) and different Lie symmetries, and can also correspond to the same Lie symmetry and different Birkhoff's functions(Birkhoffian).
Study on the purification effects of aquatic plant floating-beds for urban polluted water
ZHAO Feng, ZHANG Yong, HUANG Min-sheng, WU Xiao-hui, ZHANG Yi-fan, HE Yan
[Abstract](2937) [PDF 1048KB](2371)
Abstract:
Three kinds of ecological floating-beds were made of Hydrocotyle vulgaris, Nymphaea tetragona and Iris sibirica, respectively, to study their purification effects on removing pollutants of urban polluted water. The experiment lasted for 35 days. The results indicated that the three aquatic plants were adaptable to grow in the urban polluted water, and their biomass, height and root increased significantly at the end of the experiment. The growth rates were Nymphaea tetragonaHydrocotyle vulgarisIris sibirica. Three plants had strong ability to remove CODCr, NH+4-N, TN and TP, which were higher than that in the control treatments (P0.05). The removal rates of TN by Hydrocotyle vulgaris, Nymphaea tetragona and Myriophyllum verticillatum were 90.0%, 85.7% and 81.2%, respectively. In addition, the removal rates of TP by Hydrocotyle vulgaris, Nymphaea tetragona and Myriophyllum verticillatum were 68.6%, 57.0% and 62.8%, respectively. Based on their significant effects on nitrogen and phosphorus removal, the three plants are recommended as species of aquatic plants in ecological restoration engineering of urban polluted water.
Lower semicontinuity to parametric lexicographic vector equilibrium problems
FANG Zhi-miao, ZHANG Yu, CHEN Tao
[Abstract](1608) [PDF 280KB](2371)
Abstract:
In this paper, a parametric vector equilibrium problem in a lexicographic order was first introduced. Then, by using an auxiliary problem, the lower semicontinuity of the solution set map was established based on the density of the solution set mapping for a parametric lexicographic vector equilibrium problem.
Motu ad serving technology
GUO Xin-yu, CAI Wen-yuan
[Abstract](2393) [PDF 1835KB](2370)
Abstract:
After elaborating on the classification and characteristics of online advertising, this paper pointed out three shortcomings of image ads: fewer creative advertising,poor information transfer efficiency and low conversion. Then, in order to overcome these shortcomings, the concept of Motu (Magic Pictures) technology was proposed. Motu technology makes image ads no longer be confined to the traditional banners, windows and other forms, so as to take full advantage of the resources about the sites images instead.Each image will become the source of the advertising revenue to increase the effective impressions and improve advertising conversion efficiency.With the minimum advertising investment, outstanding user experience and significant advertisement effect,Motu technology fully meets the concept of images are advertising.
Ultrastructure of the microtubular cytoskeleton in Euplotes eurystomus(Hypotrichous, ciliophora)
SHENG Xin, LI Qi-li, ZHANG Xiao-cui, ZHAI Nan, GU Fu-kang
[Abstract](2627) [PDF 4683KB](2367)
Abstract:
Ultrastructure of the ciliature and cortical non-ciliated microtubular cytoskeleton in the Hypotrichous ciliate, Euplotes eurystomus were revealed using transmission election microscopy. The results show the former is consist of not only cilium and basal bodies but also their linking-fibrous, the basal body bracket, the associated microtubules and the fibrillar cirral basket; However, the latter is consist of the subpellicular microtubule layers, the microtubules in the subpellicular granular layer, the cytoplasmic microtubules and the microtubules in the cortical preiection-layers. These results offer some basic information for revealing the construction details of cortical microtubular cytoskeleton of hypotrichous ciliate in depth.
Discharge pattern of rural domestic sewage and the efficiency of soil infiltration in Shanghai
REN Xiang-yu, SHANG Zhao-yi, CHE Yue, YANG Kai, ZHONG Chun-jie
[Abstract](2548) [PDF 1722KB](2367)
Abstract:
A field investigation was made in respect of the volume and quality of domestic sewage in 3 villages in Baoshan District of Shanghai, where pilot experiments of domestic sewage treating system had been performed. Meanwhile, a study on the water usage and discharge pattern in rural areas and an assessment of efficiency of soil infiltration system were made by continuous monitoring data. And an evaluation of the contribution by septic tank and treating system was also made. Finally, suggestions on the promotion and management of domestic sewage treating system in Shanghai was provided.
Research on the mechanism design and measure of quality for online advertising in consideration of reputation
YIN Hong, XU Yan-ru, WANG Chang-bo
[Abstract](2004) [PDF 1440KB](2365)
Abstract:
How to get the maximum profit with online advertising is the most concern issue for advertisers. However, only pursuing the Click Through Rate maybe can not bring the maximum profit, which even induces huge amounts of network fraud information and fraudulent transaction. Considering the factors of the advertisers reputation, matching degree of product and clicking value, based on the mechanism design theory, an optimal launching mechanism for online advertising was proposed here, Further, the quality measure of advertise launching was calculated based on our mechanism. Through the final simulation testing and visual analysis, it was shown that our mechanism considering reputation has superiority on the launching efficiency.
Networked fault tolerant control of the uncertain singularly perturbed system with packet dropout
WANG Yan-yan, LIU Wei, KONG Ling-zhi
[Abstract](1981) [PDF 336KB](2363)
Abstract:
Considering the networked packet dropout of a singularly perturbed system under actuator failure, the original system was transformed to a singularly perturbed uncertain switched system. Then, the difficulty arising in the boundary dynamic behavior caused by a small parameter was overcome by using the matrix inequality technique. Meanwhile, the feedback stabilization of the singularly perturbed uncertain switched system was studied under some certain data dropout rate. Further, the design method of a controller and the sufficient condition of stabilization of the system were presented. Finally, a numerical example was given to illustrate the effectiveness of the proposed method.
Spin interactions in direct-gap semiconductors
SUN Fang, TANG Zheng
[Abstract](2337) [PDF 1185KB](2356)
Abstract:
This paper studied spin interactions in a direct-gap system with the two-impurity Haldane-Anderson model, by using exact quantum Monte Carlo method. Exact numerical results revealed two types of magnetic correlation functions, and none of them showed clearly RKKY-type oscillatory behavior. Besides, it was observed that magnetic correlation in the system was complicated and multifactor controlled. The complex magnetic behaviors observed in this study would be helpful for understanding the magnetic properties of a gaped system, snch as the dilute magnetic semiconductors.
A novel palmprint recognition algorithm based on Curvelet invariant features of the surface
SHEN Sha-sha
 doi: 10.3969/j.issn.1000-5641.2015.03.012
[Abstract](1070) [PDF 147KB](2353)
Abstract:
Corresponding to the problem of difficult feature extraction , poor stability and large characteristic dimension of palmprint, a novel palmprint recognition algorithm based on Curveletinvariant features of the surface is proposed.We can obtain the stable feature surface though Curvelet transform,which is used to match.This way not only simplifies the operation, such asfeature extraction, image coding and other traditional operation,but also has lower dimension, which leads tohigh stability and fast recognition speed with a high recognition accuracy at the same time. Finally, we use the normalized correlation classifier to measure the similarity. By PolyU palmprint database verification, the equal error rate of our algorithmis only 1.7690% and matching time is 16.6 ms, which demonstrates the effectiveness of the proposed algorithm.
Non-point source pollution management oriented urban watershed division method in tidal plains
Lv Yong-peng, YANG Kai, CHE Yue, JIN Yan, XU Qi-xin
[Abstract](2329) [PDF 2824KB](2346)
Abstract:
This paper analyzed the characteristics of urban watershed in tidal plains. Non-point source pollution management oriented urban watershed division method in tidal plain was proposed from three aspects of spatial scale, runoff mechanism and management intensity. Lingang watershed of Shanghai in China was taken as a case. The results showed that Lingang watershed can be divided into one first-class sub-watershed, 13 second-class sub-watersheds and 137 third-class sub-watersheds. The spatial distribution of the second-class sub-watersheds and function divisions are almost the same, which indicates the proposed method is operable.
Spatial and temporal variations and mechanism of the tidal level and range in the North Branch of the Changjiang Estuary
SONG Yong-gang, ZHU Jian-rong, WU Hui
[Abstract](2785) [PDF 2147KB](2339)
Abstract:
With the combined effects of the river discharge, tide and wind stress, the spatial/temporal variations as well as the dynamical mechanism of the tidal level and tidal range in the North Branch of the Changjiang Estuary were numerically simulated and quantitatively analyzed in this paper. The monthly mean tidal level in the North Branch is increased gradually from January to July and decreased gradually from October to December. It mainly depends on the residual water level, which is determined by the amount of the river discharge. The tidal range experiences a seasonal variation, with two maximum and two minimum values in a year. These two maximum values appear in March (the second lunar month) and September (the eighth lunar month), and the two minimum ones appear in June (the fifth lunar month) and December (the eleventh lunar month), respectively. The highest and lowest tidal levels at the Qinglonggang station are mainly determined by the intensity of tidal forcing, and associate with the seasonal variations of the tide and river discharge. The averaged, highest and lowest tidal levels represent a landward increment feature along the North Branch. The tidal range is increased gradually from the mouth to the middle reaches of the North Branch, and decreased from its middle reaches to its upper reaches. The northerly wind in winter tends to produce an increment of the tidal level at the Qinglonggang, and the southerly wind in summer tends to produce a slight decrement of the tidal level and range there. The wind stress has almost no effect on the tidal range in the North Branch. The river discharge increases the tidal level, restrains the tide, and decreased the tidal range.
Assessment of algal diversity and water quality in the foururban rivers of Shanghai in winter (Chinese)
JIANG Xue-qin, YU Na, MAO Kai-yun, LIU Yi, LI Er-chao, CHEN Li-qiao
[Abstract](3325) [PDF 1430KB](2336)
Abstract:
To evaluate the restoration from the contaminative water condition of four rivers with different ecological types, which are Wuchaogang river, Henggang river, Chaoyang river and Caoyanghuanbang river in the urban unit of Shanghai, the investigations of the spatial variations of phytoplankton community structure, and chemical and physical parameters were undertaken from November 2007 to January 2008, and the relationship between the phytoplankton diversity and water pollution was also analyzed comprehensively. There are 150 species of 7 phylums of planktonic algae, including 61 species of Chlorophyceae, 27 of Cyanobacteria, 24 of Acillariophyta, 23 of Euglenophyta, 11 of Xanthophyta, 3 of Cryptophyta, and 1 of Pyrrophyta. Dominant species are Chlorophyceae, Cyanobacteria and Acillariophyta. Judging from the whole winter, the four rivers have almost no differences in the distribution of species composition such as Chaoyang river (78 species)Wuchaogang river (76 species) Henggang river (74 species) Caoyanghuanbang river (72 Species). The distribution of the four rivers in cell density and biomass are as follows respectively: Chaoyang riverCaoyanghuanbang riverWuchaogang riverHenggang river, and Caoyanghuanbang riverChaoyang riverWuchaogang riverHenggang river. Chlorophyceae is the main phytoplankton, then Bacillariophyta and Cyanophyta. The contents of N and P in the four rivers are all surplus and have an obvious correlation with both the cell density and the biomass, which are negatively correlated with P, and positively with N. The four rivers were analyzed and valued with diversity indexes of nutritional status and the Caoyanghuanbang river is the best one, followed by Wuchaogang river and Henggang river, and Chaoyang river is the worst. It is found the three parameters of the diversity indexes are too ideal in assessing small urban rivers water quality, and they are inconsistent with that evaluation criteria of the species, cell density and biomass of phytoplankton. Therefore, it should be cautious to apply the biological diversity indexes to valuate urban rivers environment.
Numerical method for option pricing under jump-diffusion process
LI Wei, ZHOU Sheng-wu
[Abstract](2946) [PDF 471KB](2336)
Abstract:
Numerical method for partial integro-differential equation (PIDE) resulting from option value under jump-diffusion process was studied. A non-homogeneous linear system was obtained by discretizing the spatial derivatives utilizing the fourth-order difference and extending boundary using fourth-order Lagrange interpolating polynomial. Based on $\mathrm{Pad\acute{e}}$\ approximations and partial fraction version of the matrix exponential, a high-order smoothing Crank-Nicolson scheme was constructed. Numerical calculation discussed the influence of jump intensity on vanilla option value and barrier option value, showed that the algorithm was efficient. Compared with classic Crank-Nicolson scheme, the numerical scheme avoided the spurious oscillation near the strike price and barrier value. The algorithm also can be used in the general linear boundary value problem which has non-smooth boundary.
A class of singularly perturbed weakly nonlinear boundary\\[2mm] value problems with interface conditions
WU Cheng-Long
 doi: 2016.03.004
[Abstract](1089) [PDF 284KB](2330)
Abstract:
In this paper we study a class of weakly nonlinear boundary value problems with interface conditions. By means of the Schauder fixed point theorem we establish the theorem about a weakly nonlinear boundary value problem with interface conditions. By the method of boundary layer function, the formal asymptotic solution is constructed, which is used to prove the existence of the solution
Study on preconsolidation pressure of silt in the Yellow River Delta
YANG Xiujuan, JIA Yonggang, LIU Hongjun
[Abstract](3119) [PDF 1889KB](2321)
Abstract:
By indoor experiments about the silt in the Yellow River Delta, the characteristics of the silt’s preconsolidation pressure were studied from points of soil genesis, structure and component, and sedimentary environment. The studies show that, the silt in the Yellow River Delta, as a special regional soil, has a different trend of the preconsolidation from the traditional theory. And the preconsolidation of silt is most constrained by soil genesis, structure and component, and is affected by the overlying pressure in little degree.
Quasi-stationary distributions for absorbing stochastically monotone Markov chains
ZHU Yi-Xia
 doi: 2016.03.006
[Abstract](1092) [PDF 240KB](2316)
Abstract:
In this paper, we prove some limit theorems for absorbing stochastically monotone Markov chain during its lifetime. The emphases are on the stationary conditional, doubly limiting conditional and limiting conditional mean ratio quasi-stationary distributions. We study the uniqueness and domain of attraction of three types of quasi-stationary distributions for stochastically monotone Markov chains. A sufficient condition for the uniqueness of the three types of quasi-stationary distributions is given in our main results and under this condition, the unique quasi-stationary distribution attracts all initial distributions. We apply the main results to birth and death processes.
Investigation and analysis on the biodiversity and ecological environment in the Hengsha East Shoal of the Yangtze Estuary
TIAN Bo, ZHOU Yun-xuan, YUAN Lin, ZHAO Yun-long, CHEN Ya-qu, YUAN Xiao, CAO Yong
[Abstract](1874) [PDF 2747KB](2314)
Abstract:
As a result of the complex interaction between the estuary enclosure human engineering, the Yangtze River upstream runoff, and the wave and tidal current from the East China Sea, the wetland biodiversity and ecological environment of Yangtze Delta Hengsha East shoal have been changing quickly and sharply. We use remote sensing observation data, field measurement, data analysis in laboratory and historical data collection to conduct a systematic investigation and analysis about the landform, benthic organisms, fish plants and water environment in the Hengsha East Shoal. The results show that the diversity of the region is abundant and water quality and ecological environment is good also. The impact with estuarine engineering implementation and construction is on the need for further monitoring and scientific evaluation.
Geometric singular perturbation approach to singular singularly perturbed systems
LU Hai-bo, NI Ming-kang, WU Li-meng
[Abstract](1551) [PDF 196KB](2313)
Abstract:
Singularly perturbed systems for which the reduced system has a manifold of solutions are called singular singularly perturbed. Boundary value problems for such systems were examined by geometric singular perturbation approach in this paper. Assumptions were derived which ensure the existence of a locally unique solution which is near a singular orbit of the dynamics of limiting fast and slow systems.
Upgrades of the integrated visualized storm surge forecasting system in the Changjiang Estuary
LI Cheng, GE Jian-zhong, DING Ping-xing
[Abstract](2027) [PDF 2364KB](2309)
Abstract:
This study focuses on the upgrade of an integrated storm surge forecasting system for the Changjiang Estuary with development tools such as VB.NET, Intel Fortran, etc. The forecasting efficiency with wave consideration has significantly improved by the implementation of SWAN parallel computation. Hydrodynamic model could provide much faster forecasting with the optimization and modularization of the source code. New software interface was designed to improve the compatibility and stability. The comparison between the original and upgraded version is given with 5 storm surge simulation, with an aim to show the system improvement on forecasting efficiency and precision. It shows the model precision of upgraded version is guaranteed. The efficiency is quantitatively increased by 68% and 60% with consideration and neglecting of wave effect, respectively.
PZT/PVDF flexible composites applied on ISM antenna(Chinese)
ZHENG Zheng-qi;YUE Peng;WANG Lian-wei;ZHANG Jie
[Abstract](3537) [PDF 845KB](2308)
Abstract:
With solution blending process, PZT/PVDF composite thin films was formed. Dielectric constant and loss factor was measured through shortended waveguide test line. As the composite has the advantage of high dielectric constant, low loss factor and flexibility, a miniaturized ISM band composite microstrip antenna was designed for ETC system of freeway. 
Analysis of system characteristics and vulnerability of rainstorm hazards in Shanghai
LU Min, LIU Min, QUAN Rui song, ZHANG Li jia, WANG Jing jing
[Abstract](2920) [PDF 1444KB](2307)
Abstract:
Based on nearly 30 years rainstorm data, this paper did dynamic research on the exposure, vulnerability of the Shanghai urban system under the impact of rainstorms. Under the rainstorm environment, the evolution process characteristic of the system was also studied. The result showed that the amount and the intensity of rainstorm indicate a significantly increasing tendency in recent 30 years; the rainstorm increased the hazard of urban waterlogging. While the impact of urban flood disaster caused by low intensity rainstorm is slight, extreme rainstorms still bring great threat to the city. In urban construction and development process, social system change, such as the design and the improvement of drainage capacity, rebuilding of old district and the improvement of housing standards, reduced urban waterlogging hazards and vulnerabilities. However, with the development of the urban area, new weak and hazardous regions emerge, thus it is necessary to contnue doing dynamic analysis on the disaster vulnerability of the system.
One-loop analysis of nucleon-nucleon scattering in the chiral effective field theory
LI Fan, YANG Ji-Feng
 doi: 2016.03.008
[Abstract](1022) [PDF 384KB](2307)
Abstract:
In this paper we will analyze the important one-loop pion-exchange diagrams for nucleon-nucleon (N-N) scattering in the relativistic framework of chiral effective theory, namely the triangle diagrams and the planar box diagram. On this basis, we wish to further explore the structures of the chiral effective theory in order to contribute to the establishment of a satisfactory effective field theory for nuclear forces
Survey of mainmemory database availability
JIANG Ze-Yuan, LIU Hui-Lin, WU Gang, WANG Guo-Ren
 doi: 10.3969/j.issn.1000-5641.2014.05.007
[Abstract](925) [PDF 712KB](2305)
Abstract:
With the development of hardware technology, the cost of main memory is decreasing, which makes it possible to let DBMS (Database Management System) put the whole data into main memory. Compared to traditional DRDB (DiskResident Database), MMDB (MainMemory Database) provides much faster of data storage, higher throughput of applications, stronger ability on concurrent access, and meets the demand of timely response. However, due to its volatility, MMDB has differences on system availability with DRDB. The survey focuses on main strategies of improving the availability of MMDBs, including fast recovery, redundant backup and fault tolerance mechanism.
Realization of ${\bm B}_{\bm 2}$ type finite W-algebras
ZENG Yang, SHU Bin
[Abstract](3049) [PDF 357KB](2297)
Abstract:
In this paper we constructed an explicit set of generators for the finite W-algebras associated to all nilpotent orbits of $B_{2}$ type Lie algebras. We also computed the relations for these generators. The results give realization of $B_{2}$ type finite W-algebras.
Three-dimensional nickel-coated silicon microchannel plates for supercapacitors
LIU Tao, WANG Fei, XU Shao-hui, WANG Lian-wei
[Abstract](2510) [PDF 3558KB](2294)
Abstract:
A unique three-dimensional Si-MCP/Ni/Ni(OH)2 structure for supercapacitor was produced. Chemical liquid deposition was carried out to grow nano-sized Ni(OH)2. The as-prepared Ni(OH)2 film consists of many intertwined nano-flakes with both the - and -Ni(OH)2 phases. The formation mechanism of Ni(OH)2 was introduced. The as-prepared and annealed materials were evaluated electrochemically by cyclic voltammetry and chronopotentiometry. The cyclic voltammetry results reveals a typical redox characteristic of the sample. A specific capacitance of 2 150 F/g was observed at a discharge current of 10 mA, and the structure has high stability in prolonged charging and discharging experiments. The capacitance of the annealed sample decreases as the annealing temperature increases. Surface morphology of the samples after 2 000 cycles and annealed samples were observed. Decrease of the surface area of Ni(OH)2 is consi-dered as the main reason of the capacitive loss. Owing to the large specific capacitance and good stability, the unique structure is suitable for electrochemical super-capacitors used in secondary power sources and devices.
Least Q-eigenvalue of a graph
HE Chang-xiang, ZHOU Min
[Abstract](2045) [PDF 250KB](2293)
Abstract:
We showed that: If $G$ is a non-bipartite connected graph, then $q(G)\geqslant \frac{1}{n(D+1)}$, where $g(G)$ is the least $Q$-eigenvalue of $G$, and $D$ is the diameter of $G$. Some relations between the least $Q$-eigenvalue of $G$ and that of its subgraph were given.
Pd-Ni/SiNWs electrode for nonenzymatic glucose detection
YU Jiang-jiang, ZHANG Jian, ZHENG Xiao-dong
[Abstract](2201) [PDF 3078KB](2292)
Abstract:
A nonenzymatic glucose sensor was fabricated by electroplating palladium particles on a nickel modified silicon nanowires(Ni/SiNWs) array electrode. The morphology of the Pd-Ni/SiNWs electrode was characterized by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) analysis. The performance of this sensor was characterized by cyclic voltammetry (CV) and fixed potential amperometry techniques. Under the fixed potential of +0.19 V, the sensitivity of the electrochemical oxidation for glucose is 302.2 AmM-1cm-2 and the detection limit (S/N ratio=3) is 4.9 M in the 0.1 M KOH alkaline electrolyte. Furthermore, the electrode shows good resistance for the interfering species such as the ascorbic acid (AA) and uric acid (UA). This novel sensor has great potential for the determination of glucose.
Sufficient and necessary condition for the chromatic equivalence of a class of graphs
MA Hai-cheng, LI Sheng-gang
[Abstract](7831) [PDF 195KB](2286)
Abstract:
A necessary and sufficient condition for the adjoint equivalence of two graphs with the adjoint minimum real root at least $-$4 was given. Based on this result, a necessary and sufficient condition of the chromatic equivalence for the complement graphs of these graphs can be naturally obtained.
Investigation on chemiluminescence detection of vitamin B12 with capillary electrophoresis
ZHU Jin-kun, SHU Lu, WU Min, WANG Qing-jiang, HE Pin-gang, FANG Yu-zhi
[Abstract](1353) [PDF 363KB](2283)
Abstract:
Based on the chemiluminescence (CL) catalysis of vitamin B12 (VB12 in luminol-H$_{2}$O$_{2}$ system, a novel capillary electrophoresis-chemiluminescence (CE-CL) method was developed for the accurate determination of this important nutrient substance. First of all, sodium hydrosulfite (Na$_{2}$S$_{2}$O$_{4})$ was found to be used as an competent reduction reagent to pre-reduce VB12(Co(III)) into VB12(Co(II)), which produced strong CL emission in the CL reaction of luminol-H$_{2}$O$_{2}$. In this process, some interfering CL noise was observed and capillary electrophoresis (CE) was taken to remove it by efficient separation. In this way, VB12 could be reduced gently and determined accurately by the catalyzed CL signal with our lab-constructed CE-CL system. The proposed CE-CL determination could be finished in 20 min with a detection limit (LOD) of 2$\times $10$^{-7}$ mol/L ($S$/$N$=3), a linear range from 6$\times $10$^{-7}$ to 6$\times$10$^{-4}$ mol/L ($r^{2}$=0.968) and a relative standard deviation (RSD) of 2.4{\%} ($n$=9). Utilizing this method, satisfactory results were obtained by testing VB12 tablets with a recovery of 97{\%}$\sim $106{\%}. Compared to previously reported CL analysis of VB12, we dealt with the interference components in pre-reducing solution for the first time to gain more reliable data with convenient operations.
Silver-coated silicon microchannel plates for three-dimensional lithium-ion batteries anodes
WANG Fei, XU Shao-hui, ZHU Shan-shan, LOU Xue-feng, HUI Ke-shuang, YANG Ping-xiong, WANG Lian-wei
[Abstract](1791) [PDF 2000KB](2283)
Abstract:
In this work, a three-dimensional (3-D) anode using a silver-coated Si microchannel plate (Si-MCP) as the active materials was prepared by photo-assisted electrochemical etching followed by electroless deposition. Using lithium foils as the counter electrodes, representative half-cells are fabricated and tested. In galvanostatic charge-discharge (C-D) measurements at 10 mAg-1 between 0.02 and 1.5 V, our anode exhibits a charge capacity of 3484.7 mAhg-1 with a coulombic efficiency close to 95.97% in the initial cycle. Based on the cyclicvoltammetry (CV) and the electrochemical impedance spectroscopy (EIS) data, the mechanism about the lithiation of Ag-coated Si-MCP was also studied.
Evaluation of ecological forest ecosystem services in Zhenhai District, Ningbo
SHEN Chen-chen, YIN Jun-guang, ZHANG Jing, HUANG Yan-cheng, DA Liang-jun
[Abstract](2353) [PDF 1831KB](2281)
Abstract:
The concentrations of microbe content, negative-ion and the temperatures, humidities, noises were monitored in 9 sample points in Zhenhai ecological forest belts, combined with the quantitive analysis of pollutants contents and dust accumulation abilities in the leaf samples. Based on these data and by applying the methods of substitution of the expenses, and shadow project, the ecological services of forest ecosystem in Zhenhai District were evaluated. The results showed that in 2008, the total value of ecological forest ecosystem services in Zhenhai District was 1.652 8108 yuan. The sequence of the service function values was as follows: atmosphere environmental purification>water storage>temperature regulation>C fixation and O2 release>biodiversity conservation>provision of forest products>soil conservation soil conservation. Two factors which influence the evaluation of the ecological forest ecosystem services were proposed, including the characteristics of plant communities and the selection of assessment indexes and methods.
Perpetual American straddle option
CEN Yuan-jun, YI Fa-huai
[Abstract](1201) [PDF 169KB](2281)
Abstract:
By appplying the comparison principle for the variational inequality, we analyzed the behavior of exercise boundaries for the perpetual American straddle option. We found that it is a free boundary problem. Different from the standard perpetual American option, it has two exercise boundary points with dividends and only one free boundary point without dividends. These results can be understood very well from the financial point of view. We will present a rigorous mathematical proof, and find the bounds of exercise boundaries for the American straddle option with finite expiry.
Phytoremediation of heavy metals and rhizosphere detection of bacteria in a drainage river sediment
WANG Lei, QI Pei-shi, XIN Ming,
[Abstract](2972) [PDF 4068KB](2280)
Abstract:
Concentrations of heavy metals (Pb, Zn, Cr, As, Ni, Cu and Cd) in a drainage river sediment were determined from the industrial area of Harbin city in Heilongjiang Province. Pot experiment was conducted to evaluate the potential of four spontaneous plants, 〖WTBX〗Zea mays 〖WTBZ〗L., 〖WTBX〗Polygonum lapathifolium 〖WTBZ〗L., 〖WTBX〗Solanum nigrum〖WTBZ〗 L. and 〖WTBX〗Rumex patientia〖WTBZ〗 L. for heavy metals phytoremediation in the drainage river sediment contaminated with industrial effluent. The results revealed that the sediment was polluted by heavy metals. The contents of residual fractions of the 7 heavy metals decreased, while the Fe-Mn oxide fractions and exchangeable fractions consistently increased via two-season cultivations. Sequential extraction results confirmed the capability of the four plants to increase the bioavailability of these heavy metals. The concentrations of heavy metals in sediments and plants were in the same trend: Zn>Pb >Ni>Cr>Cu>As>Cd, which reflected the biomonitoring potentialities of the tested plants. The heavy metals accumulations and translocations of the four plants were investigated. The results showed that the plants accumulated more Zn and Ni than the other metals; and the concentrations of Cu in shoots were low. Zinc and Ni levels in plant samples ranged from 108.4 mg/kg in shoots to 543.92 mg/kg in roots and 36.8 mg/kg in shoots to 246.91 mg/kg in roots of different species, respectively. Generally, the four species excluded multiple metals from the shoot tissues and accumulated in root zones, behaving as tolerant plants. However, polygonum lapathifolium L., Rumex patientia L. andSolanum nigrum L. showed high Pb, Zn and Cd shoot accumulation with high metal translocation factor (TF1), respectively. It suggested the three species had phytoextraction potentialities. In addition, florescence in situ hybridization (FISH) was used to analyze the amount and distribution of bacteria in the rhizosphere sediment. It suggested the four plants have effect on bacterial activations.
Study on meta-zooplankton community structure of Dianshan Lake
FENG De-xiang, LIU Yi, YU Na, CHEN Liang, LI Er-chao, CHEN Li-qiao
[Abstract](2845) [PDF 1428KB](2273)
Abstract:
The investigation of the community structure of zooplankton in Dianshan Lake was undertaken monthly during October 2008 to October 2009, including species composition, standing crop dynamics and diversities. A total of 80 metazooplanton species including 46 Rotifera (58%), 21 Cladocera (26%) and 13 Copepoda (16%) were encountered. The dominant species were five species of rotifera (Keratella cochlearis, Keratella quadrata, Keratella valga, Brachionus calyciflorus and Brachionus diversicornis), three species of copepod (Microcyclops leuckarti, Sinocalanus dorrii and Schmackeria forbesi) and two other species of cladocera which showed a trend of miniaturization (Bosmina longirostris, Brachionus coregoni and Moina micrura). The zooplankton mean density was 356334 ind./L and ranged from 52 ind./L in May 2009 to 1260 ind./L in December 2008, and the zooplankton average biomass was 12.6712.53 mg/L, with the highest value in July 2009 and lowest in December 2008, which was 40.85 mg/L and 1.45 mg/L respectively. Regarding the distribution of the sampling sites, the highest values of the yearly mean density and biomass both appearred in Site 11, and the lowest density in Site 9 with the lowestbiomass in Site 7, respectively. The value of Shannon-Wiener index(H) in Dianshan Lake fluctuated between 0.841 and 2.187, with 1.718 as average. Upon the evaluation of biological diversity index, the water quality of Dianshan Lake could be regarded as mesosaprobity according to the results analysis.
Bogdanov-Takens bifurcation for a delayed predator prey system with stage structure
LIU Xia, JIAO Jian-Feng
 doi: 2016.03.005
[Abstract](1084) [PDF 294KB](2267)
Abstract:
In this paper the Bogdanov-Takens (BT) bifurcation of a delayed predator prey system with stage structure and constant harvesting is considered. The existing conditions which guarantee an interior equilibrium of the system is BT singularity are obtained and the corresponding normal form for the system at this singularity is presented, some bifurcation results are shown
Oscillations of a class of third order nonlinear neutral functional differential
HAN Zhong-yue
[Abstract](1909) [PDF 190KB](2266)
Abstract:
The oscillations of a class of third order nonlinear neutral functional differential equations was discussed, by using the generalized Riccati transformation and the integral averaging technique; and some new sufficient conditions for oscillations or tends to zero of all solutions of the equations were obtained. The example to illustrate the main results were given. The results extend and improve some known results.
Toroidal embeddings of K7
ZHAO Wen-zhou, SHI Li-hua, WU Hao, REN Han
[Abstract](2065) [PDF 2280KB](2265)
Abstract:
In this paper, we showed that there are exactly $2\times5!$ embeddings of $K_7$ in the torus. All of such embeddings are triangular permitting $Gr\ddot{u}nbaum$ coloring.
Effects of application rates of N,P fertilizer on yield and nitrate accumulation in lettuce
ZHANG Jun guo, DA Liang jun, ZHANG Cai xian, NIAN Yao ping, XIA Ti yuan,
[Abstract](3106) [PDF 1058KB](2264)
Abstract:
An experiment was carried out on field to investigate the relationship between the yield, nitrate accumulation and N,P fertilization level in lettuce. The yield of lettuce increased 32.4%, when the rates of N and P were reduced to 46.4% of that in high fertilizer groups. N and P, applied in proper combinations, are important factors for high yield of lettuce. The optimal level of nitrogen for high lettuce yield was 180~270 kg·hm-2,and that of phosphorus was 125~190 kg·hm-2. The content of nitrate in lettuce increased with the increasing of nitrogen levels of fertilizers. Appropriate phosphorus levels could restrain nitrate accumulation of lettuce. Proper N,P combinations could improve the quality of lettuce and increase yield.
Boundedness of the solutions of the T-system and its control(English)
SHU Yong-lu, WANG Meng
[Abstract](3214) [PDF 150KB](2256)
Abstract:
The boundedness of solutions of a chaotic T-system wasproved by constructing a new Lyapunov function. Furthermore, thetheoretical results of the boundedness of a T-system can be used forchaos control and synchronization. Effective linear feedbackcontroller was proposed for stabilizing chaos to unstableequilibrium$(0, 0, 0)$.
Research on separation method of highly polar compound DMC and impurities in it by HILIC
HAN Bing-bing, WANG Cui-cui, LI Xin-jun, ZOU Xin-zhuo
[Abstract](3100) [PDF 1517KB](2252)
Abstract:
HILIC method was established to separate and analyze highly polar compound methacryloyloxyethyl trimethyl ammonium chloride (DMC) and its impurities. Using two different chromatographic columns:HP-Cyano column and X-Bridge HILIC column,highly polar compound DMC and its impurities were all well separated by gradient elution using acetonitrile and water as mobile phase. With the two different chromatographic columns, four impurities in DMC were separated, such as dimethylaminoethyl methacrylate (DM),methacrylic acid (MAA), choline chloride (CC) and Hydroquinone monomethyl ether (MQ). This method has higher practical value, which can be used effectively in separated highly polar compounds.
Characterization of a humidity sensor fabricated with SnO2 nano-spheres via dielectrophoresis
CAO Chun-yue
[Abstract](1771) [PDF 2541KB](2247)
Abstract:
A relative humidity sensor was fabricated by dielectrophoresis (DEP) to connect with the sphere-shaped SnO2 nano-particles as sensing elements based on the Au micro-electrodes with the gap of 20 m. the I-V curve obtained verified good electric conductivity of the Au/SnO2/SnO2/Au structure fabricated. The sensing properties were tested in a self-designed relative humidity measuring system. The high sensitivity and good repeatability were obtained. It was proved the sensing structure fabricated in the solution using DEP has good stability under varied humidity levels, even under a high humidity level. The proposed methodology can be easily applied to other nano-spheres and construction of other devices.
SIM(2) gravitational gauge theory
WU Yi-Wei, XUE Xun
 doi: 2016.03.009
[Abstract](1075) [PDF 293KB](2247)
Abstract:
Based on the anisotropies of CMB (Cosmic Microwave Background Radiation, CMB) on the large scale and Mach's principle,this paper proposed that the Lorentz invariance is violated from the length scale of galaxy. SIM(2) gauge theory was taken as an example of such motivation to illustrate the so called dark matter effect,the deviation of astronomical observation from Newton-Einstein prediction, which can be emerged from the accumulated Lorentz violation effect on the short scale. SIM(2) gauge theory was analyzed and 8 additional constrain equations were obtained in addition to the equation of motion, while the independent components of contorsion were also reduced to 8. It can lead us to the conclusion that the contorsion is non-trivial and can contribute an effective energy-momentum distribution even in the region devoid of matter. Finally, the cylindrical symmetrized solution of metric under weak field expansion was given and its property was analyzed.
Application of reverse rank-aware queries in the Internet advertising
ZHANG Zhao, SHEN Kai-wen, GONG Xue-qing
[Abstract](1959) [PDF 1771KB](2244)
Abstract:
The matching of the products features and users preferences is the key issue of the Internet Advertising. This paper introduced several important database query techniques bringing convenience for the information matching, provides their definitions and extended SQL, and the emphasis would be on reverse rank-aware queries. In the mean time, an example to demonstrate these query techniques was given. At last, the conclusion and vision were presented.
Settling velocity at Xuliujing in Changjiang Esturay
SHAO Yuyang, YAN Yixing, Jerome MAA
[Abstract](4063) [PDF 2095KB](2238)
Abstract:
Insitu measurements of settling velocities were conducted at Xuliujing in Changjiang Estuary during a flood tidal and medium tidal from Sept. 2007 to Oct. 2007. An OBS3A and a LISST100 (Type B) were used together with sufficient water samples to estimate the settling velocity of suspended sediments. Based on the results of measured relationship between the average floc size and floc density, improvement on the original approach was implemented to relax the basic assumption: (1) floc density are the same for all floc size; (2) the volume of void water was included. Thus a better settling velocity of suspended sediment can be estimated.
Effects of different levels of eutrophication on the emergent aquatic plant growth and the nitrogen and phosphorus absorption abilities
LIU Li-hua, GUO Xue-yan, DA Liang-jun, LI Jing-wen
[Abstract](2834) [PDF 1046KB](2235)
Abstract:
null
Analysis of hippocampal ripple osillations by application of Kalman filter
ZHANG Lu, LIN Long-nian
[Abstract](2285) [PDF 1260KB](2232)
Abstract:
This paper studied high frequency ripple (100~200 Hz) oscillations in hippocanpal CA1 area by applications of adaptive autoregressive (AAR) model and Kalman filter. Compared with traditional real time frequency analysis of time seies based on short term Fourier transfrom (STFT), improved time and frequency resolutions in time-frequency representation could be achieved by parametric methold obtained by AAR model and Kalman filter algorithms. Thus, the occurance of ripple oscillations and the variation of ripple power could be addresed more accurate by Kalman filter than that of STFT.
Overexpression and characterization of a bacterial α-N-acetylgalactosaminidase
LIN Yi-gang, WANGYu-meng, XIA Gang
[Abstract](2110) [PDF 1764KB](2231)
Abstract:
The coding sequence of alpha-N-acetylgalactosaminidase (A4) was amplified from genomic DNA of Chryseobacterium meningosepticum and subcloned into pET24a, which was then transformed into BL21(DE3) for overexpression of His-A4. The overexpressed His-A4 enzyme was purified by using affinity chromatography and its activity was comparable to that previously reported by using a conventional method with an artificial substrate. To better measure the activity of -N-acetylgalactosaminidase in real application, we established a novel method in which we directly used the surface antigen of red blood cell as substrate and applied ELISA to the detection of un-cleaved antigen. The activity of His-A4 was evaluated in the new ELISA method and was demonstrated to be able to decrease the blood cell surface antigen-antibody reaction in concentration- and time-dependent manner.
Potential hazard assessment of typhoon storm surge based on scenario simulation methodology in Yuhuan County, Zhejiang Province
CHEN Jie, SONG Cheng-Cheng, LI Meng-Ya, WANG Jun
 doi: 10.3969/j.issn.1000-5641.2016.03.014
[Abstract](932) [PDF 5726KB](2231)
Abstract:
Typhoon storm surges are responsible for most of the damage caused by oceanic disasters in Yuhuan, Zhejiang Province. Considering the coastline features of Yuhuan County, 7 translation paths were designed based on the path of TC0608 (Saomai), which formed the lowest central pressure at the moment of landfall in Zhejiang since 1949. In consideration of the 7 translation typhoon paths and sea level rise, storm surges in 28 compound scenarios were simulated by using MIKE21 FM for potential impacts analysis. The results showed that the possibility of overtopping inundation due to typhoon storm surges was quite low under the present condition. However, the impacts obviously became more serious as sea level rising, and the three typhoons landing in the north of Yuhuan were especially sensitive in terms of responding to the sea level rose. In scenarios with the same sea level rise value, typhoons landing in the south of Yuhuan caused more serious inundation than those landing in the north part. In 2100, the largest water depth would reach 5.44 m and the inundation area would be 160.75 km2, accounting for about 35.93% of the total area of Yuhuan. The potential highrisk inundation areas are mainly distributed in the southeastern and western part of Yuhuan, with a relatively low elevation. The results could offer reference for making adaptation strategies and engineering countermeasures for future extreme storm surges disasters in Yuhuan County.
Limit theorems in infinitesimal non-commutative probability spaces
CUI Han-zhe, XUE Yi-feng
[Abstract](2586) [PDF 322KB](2227)
Abstract:
This paper proved the central limit theorems in infinitesimal non-commutative probability spaces using $R$ transform under both one-dimension and multi-dimension cases. Also Poisson limit theorem was proved using the moments-cumulants formula. Lastly, the relation between the standard semicircular elements and free poisson elements was figured out by combinatorial analysis.
Problematizing the way we do standards: focussing more on scope and rationale
T. HOEL, J. MASON
[Abstract](2056) [PDF 372KB](2225)
Abstract:
This paper brings together two perspectives on current developments in information and communications technology (ICT) utilized for the purposes of learning, education, and training (LET). One perspective is concerned with governance and legitimacy issues regarding the process and relevance of standards development; the other, is concerned with the role of discerning relevant questions in LET and the potential scope for innovation that might develop tools to support such discernment. Discussion of information systems architecture is introduced as a means to set the context and provide a framework for bringing together an overall narrative and coherence to these two perspectives. Questions initiated by why are of particular interest because they typically demand an explanation in natural language to satisfy the questioner. By focusing on why as a key primitive of enquiry the authors present an approach that might inform improved processes of ICT for LET (a.k.a ITLET) standardization.
Characteristics of sediment load and runoff in the upper, middle and lower reaches of the Yangtze River and their relationship
WANG Yi-bin, LI Jiu-fa, ZHAO Jun-kai, YAO Hong-yi, GUO Xiao-bin, CHEN Wei
[Abstract](2170) [PDF 2722KB](2222)
Abstract:
The related data from Yichang, Hankou and Datong gauging stations were collected from 19502010 to analyze the characteristics of temporal and spatial variations of the runoff and suspended sediment load in different reaches of the Yangtze River. Multi-year average of runoff (19512010) were 4.321011 m3, 7.071011 m3 and 8.961011 m3 at Yichang, Hankou and Datong gauging station, respectively. The runoff from the upper reaches of the Yangtze River was as much as that from the middle and lower reaches. Multi-year average runoff was fluctuant with no significant trend, but the difference of runoff between flood season and drought season was minimized by the construction of the Three Gorges Dam. On the other hand, multi-year average of suspended sediment load at Yichang Hankou and Datong gauging station were 4.34108 t, 3.59108 t and 3.90108 t, respectively, indicating that the main sources of suspend sediment was the upper reaches of Yangtze River. With the decline of suspended sediment load since 1980s, especially in the flood seasons, the suspended sediment load at Yichang, Hankou and Datong gauging station decreased respectively by 0.54108 t, 1.17108 t and 1.52108 t. Because of the resuspension of sediment in riverbed and river shoal and the sediment supply from the lakes along the Yangtze River, the decreases in the suspended sediment load of different grain size levels were unequal. A good linear relation was found between the suspended sediment load with grain size larger than 0.1 mm and runoff while the linear relation was weaken with the finer of grain size. This was in line with the relative theories of river dynamics. The dispersion grew up from the upper reaches to the lower reaches. This study is very helpful to understand the recent changes in the relationship between the runoff and suspended sediment load under human interventions.
Right-passage probabilities of $\emph{\textbf{SLE}}_{\bm {\kappa}}$ and critical percolation
LIANG Jing, LAN Shi-yi
[Abstract](2706) [PDF 544KB](2221)
Abstract:
This paper derived the probability formula for a chordal $SLE_{\kappa}$ trace across a given point in upper half plane $\mathbb{H}$. And on the basis of the left-passage probability, established the probability formula for a critical percolation in a closed unit circle without a given point. Finally, according to the relationship of exploration process and $SLE_{6}$, got that with the same starting and ending point, the trace of $SLE_{6}$ has the same distribution of self-avoiding walk.
Comparative analysis of microbial communities on tobacco leaves between clone library and highthroughput sequencing
GONG Jun, LIU Yu-Pei, LI Yuan-Yuan,
 doi: 10.3969/j.issn.1000-5641.2016.03.011
[Abstract](1055) [PDF 1243KB](2220)
Abstract:
In order to compare the microbial communities on tobacco leaves between clone library method and highthroughput sequencing method, we analyzed the diversity of microbial communities based on bacterial 16S rDNA and fungal ITS on tobacco leaves collected from Fujian province in China. The results showed that more numbers of bacterial and fungal sequences were detected by highthroughput sequencing than clone library. The number of operational taxonomic units (OTUs) clustered from highthroughput sequencing method was almost the same as that from clone library method in bacterial communities, while that was higher from highthroughput sequencing in fungal communities. The rarefaction curves drawn from highthroughput sequencing method tended to approach the saturation plateau. The expected community diversity indices (Chao1 and Ace) were higher in clone library method, whereas the observed community diversity indices (Simpson and Shannon) suggested that higher bacterial diversities were detected through clone library method and higher fungal diversities were detected through highthroughput sequencing method. There were more kinds of bacteria and fungi genera identified through highthroughput sequencing method. The dominant genera of bacteria were similar detected from both of the methods, including Pseudomonas, Acinetobacter and Sphingonomonas. However, the fungal genera detected through these two methods were significantly different. Overall, novel highthroughput sequencing methods outperform clone library approaches in terms of resolution and magnitude. They enable identification and relative quantification of community members of tobacco leaves and offer new insights into environmental microbiology. 
Characteristics of the avian community in winter in Caohai of Guizhou Province, China
LUO Zu-kui, LIU Wen, LI Zhen-ji, MA Guan-wei, PAN Juan
[Abstract](2907) [PDF 525KB](2219)
Abstract:
By the method of line transect, a bird survey was conducted in the Caohai Nature Reserve of Guizhou Province from December 2010 to January 2011. Habitats were classified into six catalogues, i.e. farmland, vegetable land, grassland, low water area, deep water area and woods. A total of 88 bird species was recorded, which belonged to 33 families and 13 orders. Among the bird species recorded, 1 species was in the GradeⅠnational key protected birds and 6 species was in the Grade Ⅱ, respectively. The overall density (D), 〖WTBX〗 〖WTBZ〗diversity index (H), predominant index (〖WTBX〗C〖WTBZ〗) and evenness (〖WTBX〗J〖WTBZ〗) of the avian communities were 12.14 indhm-2, 2.98, 0.91 and 0.67, and the species, 〖WTBX〗D〖WTBZ〗, 〖WTBX〗H〖WTBZ〗, 〖WTBX〗C 〖WTBZ〗and 〖WTBX〗J〖WTBZ〗 were 27~35 species, 3.93~33.76 indhm-2, 1.61~2.78, 0.41~0.91 and 0.48~0.79, respectively. The Jaccard similarity index(〖WTBX〗Cj〖WTBZ〗) of low water area-deep water area was the highest (0.667) while that of deep water area-woods was the lowest (0.016), and the Bray-Curtis index (〖WTBX〗CN〖WTBZ〗) of woods-vegetable land was the highest (0.006 8) while that of low water area-deep water area was the lowest (0.001 4). Increment from population and urbanization development brought about the loss of avian habitats in Caohai, and disturbance from human had impacts on the avian diversity. Eco-compensation measures were recommended to practice for better management in Caohai.
Monitoring of the airborne pollen grains in Shanghai
HUANG Jian-hua, WANG You-fang, SHEN Chun-lin, LYU Sen-lin
[Abstract](2480) [PDF 825KB](2219)
Abstract:
In order to investigate the quantity, species and distribution pattern of the airborne pollen grains in Shanghai, a one-year monitoring project using Cour samplers from October 2009 was carried out in six sites of Shanghai.A total of 5 324 164 pollen grains were collected, ineluding 32 families, 27 genera or species. The largest quantity of the grains was observed in Putuo District and was followed by Songjiang, Zhabei, Pudong, Xuhui and Baoshan District in that order. Songjiang District has the most diverse species of pollen grains (48) and Xuhui has the least (37).The most commonly observed types are 〖WTBX〗Humulus〖WTBZ〗 scandens, 〖WTBX〗Platanus,〖WTBZ〗 Pinaceae, Taxodiaceae, Gramineae,〖WTBX〗 Ulmus〖WTBZ〗, 〖WTBX〗Artemisia〖WTBZ〗 and 〖WTBX〗 Salix〖WTBZ〗.The peak of the grains distribution occurred during two seasons of the year: spring (March and April) and autumn (September).
Innovative e-Learning: information technology and standards, a current and future perspective
B. E. PEOPLES
[Abstract](2121) [PDF 360KB](2217)
Abstract:
We are living in extraordinary times. Emerging Information Communication Technology (ICT) is ushering in a new age of a shared knowledge society on a global scale. But what does a shared knowledge society mean? How does the incorporation of emerging ICT allow our global society to evolve and in what ways? How can we describe the unique blend of technologies allowing this dynamic transformation? What ICT emerging components are important in allowing us to effectively communicate and learn on a global scale? What standards are needed to support the implementation of these ICTs in allowing our global civilization to evolve into a shared knowledge society? In this paper, well explore how our global society is evolving e-Learning through the use of ICT, look at a few key current and emerging technologies involved, and related emerging standards.
One-dimensional BSDEs with monotonic, H\"{o}lder continuous and Integrable parameters
XIAO Li-shun, LI Hui-ying, FAN Sheng-jun
[Abstract](2030) [PDF 228KB](2216)
Abstract:
This paper established a new existence and uniqueness result for solutions to one-dimensional backward stochastic differential equations (BSDEs) with only integrable parameters, where the generator $g$ is monotonic in $y$ and $\alpha$-H\{o}lder ($0\alpha1$) continuous in $z$. By Tanaka's formula and Girsanov's theorem we established a comparison theorem for solutions in $L^1$ to BSDEs, from which the uniqueness follows. By convolution technique we obtained a uniform approximation sequence of the generator $g$ and then constructed a sequence of solutions in $L^1$ for BSDEs. Finally, we proved the limitation of this sequence of solutions is the desired solution. This proved the existence.
αCaMKII overexpressions enhance excitatory synaptic transmission in insular cortex of mice
LIU Ru-qing, DUAN Yan-hong, CAO Xiao-hua
[Abstract](2337) [PDF 1882KB](2215)
Abstract:
The experiment was designed to study basic electrophysiological characteristics and basal synaptic transmission of insular pyramidal cells in CaMKII forebrain overexpression mice by patch clamping. The basic electrophysiological results showed that there were no significant differences in the resting membrane potential, action potential and I-V curve of pyramidal cells in insular cortex between wild type and transgenic mice. No significant difference was measured in the frequency of sEPSCs and mEPSCs. However, compared to the wild type mice, transgenic mice exhibited augmented amplitude of sEPSCs and mEPSCs. There was also no significant difference in PPF curve. The results suggested that forebrain specific overexpression of CaMKII did not change the basic electrophysiological characteristics and presynaptic transmitter release in insular cortex. The influence of CaMKII overexpression on the amplitude of EPSCs may be mediated by postsynaptic receptors.
Effects of tributyltin on mRNA expressions of thyroid hormone response genes in Xenopus tropicalis tadpoles
CAO Qing-zhen, ZHU Pan, YUAN Jing, ZHANG Xiao-li, LIU Jun-qi, HUANG Min-sheng, SHI Hua-hong
[Abstract](2416) [PDF 4228KB](2211)
Abstract:
Xenopus tropicalis tadpoles (NF51) were exposed to TBT for 48 and 96 h, respectively. Exposures to 50 and 200 ngL-1 TBTCl showed no effects on the survival rate of tadpoles. The expression of TR and DI3 mRNA were significantly increased in the tails by 1~2.3 fold in the groups treated with 50 ngL-1 TBTCl. The expression of TSH mRNA was increased in the tails by 2 fold after 48 h of exposure. RXR mRNA was decreased by 0.4 fold in the brains and tails, and RXR mRNA was increased by 5.9 fold in the tails after 96 h of exposure. MCT8 mRNA was increased by nearly 3 fold in the tails in 50 ngL-1 TBT treatment group and decreased by 3 fold or so in the brains in 50 ngL-1 TBT treatment group after 96 h of exposure. These results suggest that TBT can result in the changes of multiple mRNA expressions and show high tissue-specific differences. These mRNA are involved in the synthesis, transportations, transformations and actions, which indicate that TBT shows thyroid hormone disrupting effects. The changes of related mRNA expressions indicate that TBT might disrupt the thyroid hormone system of tadpoles by binding with retinoid X receptor. Therefore, biomarkers are not only cost-effective and sensitive endpoints in screening the thyroid disrupting chemicals but also useful in identifying the mode of action of contaminants.
Experimental ecology research on destroyed evergreen broad leaved forests in TNFP, Zhejiang (Ⅳ): Contribution of seed bank to early restoration of destroyed evergreen broad leaved forests
SONG Yaobin, ZHANG Qiping, DA Liangjun
[Abstract](2343) [PDF 1135KB](2210)
Abstract:
Four destroyed evergreen broadleaved forest plots were established by simulating the common disturbance types (removing trees, H8 m; removing trees, H8 m; removing all above ground plant; removing all aboveground plant and 010 cm depth surface soil) in Tiantong National Forest Park, in October, 2003. For understanding the contribution of seed bank to the restoration of destroyed evergreen broad leaved forests, the seed germination pattern, species composition, and the similarity between seed bank and the seedlings composition of first year restoration have been studied in this paper. The results showed that there were 995 seeds in seed bank and the seed abundance was 248.75 m-2, which belonged to 28 species, 27 genera and 21 families. The role of seed bank to 4 plots were Ⅰ (0.467) Ⅳ (0.389) Ⅱ (0.368) Ⅲ (0). The pioneer species Sassafras tzumu , Alniphyllum fortunei , Clerodendrum cyrtophyllum , Litsea cubeba germinated and recruited abundantly from seed bank while the climax species Castanopsis carlesii and Lithocarpus glaber had little role to vegetation restoration. The species Choerospondias axillaries and Cinnamomum camphora mainly regenerated from exotic seed source. Conclusively, the soil seed bank exerted little role to the restoration of the evergreen broadleaved forests in this area.
Dissolving behaviors of alkali metal nitrates in the mixed solvents of CH3CHOHCH2OH-H2O at 15 ℃ and 45 ℃
ZHANG Hui-ying, LI Shu-ni, ZHAI Quan-guo, OU Yang-miao, JIANG Yu-cheng, HU Man-cheng
[Abstract](1806) [PDF 1630KB](2208)
Abstract:
The equilibrium solubilities of alkali metal nitrates in the mixed solvents of CH3CHOHCH2OH/H2O (0~1) at 15 ℃ and 45 ℃, respectively, were studied by the of density-refractive index method on a self-made microdevice. The density and refractive index of the saturated solutions were also determined using DMA4500 densimeter and RXA170 refractive index detector at 15 ℃ and 45 ℃, respectively. The solubility and density for the saturated solutions were found to decrease with an increase concentration of 1,2-propylene glycol, while the refractive index trended to increase. The solubility data, density and refractive index of the saturated solutions have been equated for their relationship using four parameters empirical equation. The salting-out effect indicated that the alkaline metal salts were salted out by 1,2-propylene glycol, where the higher the temperature, the slightly bigger the salting-out rate.
Performance optimization scheme for a novel cooperation spectrum sensing system
ZENG Ying, LI Zhi-Yong, ZHANG Chun-Ping, TANG Jing-Min,
 doi: 10.3969/j.issn.1000-5641.2016.03.010
[Abstract](1040) [PDF 2244KB](2205)
Abstract:
In order to reduce effect of hidden terminal on cognitive system performance and the error rate of perceived system, it is proposed that, under the condition of considering wireless Rayleigh fading channel and reported channel with a fixed error probability, joint optimize index p of p power detector, optimal sensing threshold and the best number of cooperative users K on multiple antenna sensing system with p power detector to minimize the total error probability. Theoretical analysis and simulation results show that cooperative spectrum sensing system has the best index p* and the best perception threshold *, and when choosing a fusion rule it can improve the reliability for sensing system by choosing appropriate cooperative users K.
Some sharp lower bounds for spectral radius of connected graphs
GONG He-lin
[Abstract](1993) [PDF 201KB](2204)
Abstract:
This paper studied lower bounds on the spectral radius of connected simple graphs and proved an useful inequality for the number of walks. Furthermore, some new lower bounds on the spectral radius of graphs were provided in terms of the maximum and minimum degree, the average degree, the 2-degree and the number of $k$-walks(with $k$ vertexes). By applying the properties of similar matrices and the Weyl inequalities, another lower bound was obtained by means of the number of $k$-walks. Simultaneously, all extremal graphs which achieve above bounds were also characterized.
Diversity, spatial pattern and dynamics of vegetation under urbanization in Shanghai (Ⅵ): Community diversity and its structural characteristics of Shanghai Green Belt
ZHANG Kai-xuan, CHE Sheng-quan, MA Shao-chu, WANG Rui, DA Liang-jun
[Abstract](2822) [PDF 2712KB](2192)
Abstract:
An investigation of plant communities was conducted in Shanghai Green Belt and 177 community plots were surveyed. The flora of vascular plant in the study area consisted of 226 species and varieties, 184 genera and 87 families. But a few species dominated the whole belt, the ratio of native trees being only 25%. There were 67 community types, which were divided into 7 vegetation types, most of them were deciduous broad-leaved forest and evergreen broad-leaved forest; however, few of them were of zonal vegetation types. The species diversity of these communities was low. The result showed that the average number of species in the tree layer was 1.68, and in that the shrub layer was 0.92. The community structure was simple, featured as a dumbbell: sparse in the middle and dense on both sides, and generally in the model of tree with natural herb. Most of trees are in poor growth.
Influence of nitrogen and phosphorus concentrations on the growth characteristics of Microcystis aeruginosa
ZHENG Xiao-yu, JIN Yan, REN Xiang-yu, GU Yong-jie, ZHU Yong-qing, YANG yi-fan
[Abstract](2800) [PDF 1477KB](2192)
Abstract:
Microystis aeruginosa was cultured in solutions of different initial nitrogen and phosphorus concentrations. The semi-saturation constants (Ks) of Microystis aeruginosa to P and N were calculated respectively by using the Monod equation. The results show that the Microystis aeruginosa grew normally when the concentrations of N and P were greater than 4.0 mgL-1 and mgL-1 respectively. The optimum concentration ranges of N and P for Microystis aeruginosa growth were 32.0~64.0 mgL-1 and 1.0~1.50 mgL-1 respectively. KsN is higher than Ksp, which indicates that the affinity of P to Microystis aeruginosa is higher than N. When the concentration ranges of N and P were 0.20~64.0 mgL-1 and 0.02~1.50 mgL-1 respectively,they had high liner correlation with the largest extent quantity of Microystis aeruginosa. The special growth rate increases continuously when the concentration ranges of N and P are 0.20~1.60 mgL-1 and 0.02~0.50 mgL-1 respectively.
Scalable distributed storage of OceanBase
HUANG Gui, ZHUANG Ming-Qiang
 doi: 10.3969/j.issn.1000-5641.2014.05.014
[Abstract](1329) [PDF 1629KB](2191)
Abstract:
OceanBase is a distributed relational database, its purpose is to store vast amounts of structured data in highgrowth, lowcost servers to achieve high availability, high scalability and costeffective services. OceanBase using memory and external store hybrid storage mode, stores the incremental (update) data in memory, and the baseline (readonly) data in external storage (usually disk), baseline data is divided into slices we called tablet roughly the same amount of data and the use of distributed B+ tree stored on many data servers, using the daily merge mechanism to keep the combined incremental data into baseline.This article describes the basic structure and distribution methods of OceanBase baseline data storage, as well as the daily merge mechanism, in addition, we will introduce in OceanBase baseline data storage format of the specific design and implementation.
Finite element computation and analysis on complex contact boundary
HOU Lei, LI Han-ling, LIN De-zhi, ZHANG Min, Daglish GEORGE
[Abstract](2114) [PDF 4332KB](2187)
Abstract:
The safety test of transportation devices, including impact test and plastoelastic deformation, is simulated both in laboratory and by computer. Contact deformation algorithm is an international standard method to simulate the skid control on complex 3-D areas. In this paper, coupled non-Newtonian fluid equations with initial boundary value are used to solve the 3-D layer structure. A finite element method (FEM) based on the variation principle is used to solve the perturbation problem, and data mining is processed by high performance software. According to the embedding principle, a stratified element division is processed, and the complex boundary is divided into several mutual connected yet not overlapped hexahedral and square elements. After building a FEM model of both macro scale and micro scale, varying curves of parameters including energy and velocity can be obtained. On the other hand, the boundary layer theory of asymptotic perturbation method is also a way to study the complex boundary problem. The characteristic function space gained can be used both to optimize the primary function of FEM, and to establish a new asymptotic method to solve the nonlinear eigen problem. It can be used to estimate the specific parameters of materials as well. The stochastic analysis of artificial boundary conditions is then used to study the resulting data.
Transient influence on the electromagnetic launch rail under a cosine function of the magnetic pressure
LIU Feng, LIU Wen
[Abstract](2121) [PDF 498KB](2186)
Abstract:
This paper studied the friction damping factors that influence electromagnetic rail launching. An electrical magnetric launcher orbit was simulated into an elastic foundation beam under a movement loading, a mathematical model of beam was established by using Euler beam theory, and the analytic solution of the flexural deflections of an orbit involving exponential functions of the dynamics problem under a simple harmonic pressure was derived with the help of the integral transformation, the inverse transformation and so on. The results of the numerical examples with MATLAB software showed that the elasticity coefficient, the viscous external damping coefficient and the coulomb damping coefficient have different influences on the transient dynamic response. So it provides sufficient theory evidence about the initial value problem of solving a higher order partial differential equation and improving the performance of an electromagnetic emission device.
Space theory on graphs: The linearly independence methods in graph theory (II)
REN Han WU Hao
[Abstract](1930) [PDF 481KB](2177)
Abstract:
In this paper we survey some important results and methods applied in graph theory and related topics. Different from the classical combinatorial matrix methods used in the fields such as the spectral theory of graphs, we concentrate on the finite linearly spaces over various kinds of number fields and their actions and influnces on the structural graph theory.
Influence of electrical conductivity of multi-walled carbon nanotubes by halogen-doping
SHI Guo-Xian XU Xue-Cheng
[Abstract](1635) [PDF 1822KB](2175)
Abstract:
Multi-walled carbon nanotubes (MWNTs) were doped by chlorine, bromine and iodine. Compared with the pristine MWNTs, the electrical conductivities of Cl2-MWNT and Br2-MWNTs were improved over 5 times and 3 times, respectively, while that of I2-MWNTs almost unchanged. The interaction between the halogen and MWNTs was analyzed by Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Meanwhile, we also studied the carrier concentration and carrier mobility which may affect the conductivities of the composite. The results show that: When the halogen electronegativity become stronger, the mean free path of the carrier of doped MWNTs will be higher, as well as the carrier mobility. And the stonger the interaction between the halogen and MWNTs become, the more carriers will take part in conducting, which means the carrier concentration will be higher.
Effect of forebrain NR2B overexpression on social interactions in transgenic mice
ZHANG Ning, LI Chun-xia
[Abstract](1951) [PDF 1797KB](2173)
Abstract:
Male and female NR2B transgenic mice and their littermate controls were subjected to the social interaction test in a novel environment, sociability test and social novelty test. There was no significant difference in social interaction test in a novel environment and social novelty test among these four groups. However, compared with wild type mice, female but not male NR2B transgenic mice exhibited improvement in sociability. These results suggest that NR2B overexpression in the forebrain can improve sociability of female mice, while having no significant effect on social behaviors in male mice.
Screening the ecological toxicity of sediments in black-odors rivers using Xenopus tropicalis embryos
YANG Bo, ZHU Pan, YUAN Jing, LIU Zhen, HUANG Min-sheng, SHI hua-hong
[Abstract](2316) [PDF 1237KB](2169)
Abstract:
To assess the pollution and management effects of the black-odors rivers from Wenzhou, we screened the toxocity of aqueous sediment extracts and interstitial water of rivers using Xenopus tropicalis embryos. The surface sediment samples were collected for 5 times from September to December in 2010. The embryos were exposed to the extracting solution of the sediments (1∶4) for the first to the fourth tests and in the interstitial water for the fifth test for 48 h. Our results showed that all the embryos treated with samples from S1 died after 48 h of exposure during the 5 tests. This suggested that the sediments in S1 showed very high toxicity. Compared with the control, the body length of embryos treated with aqueous sediments extracts from Shanxia River was significantly decreased, but the body length of embryos treated with those from Jiushan River was decreased only in the third test. The percent of malformations were higher in Shanxia River than that in Jiushan River. Especially, the percent of malforation was up to 100% in S2-S4, but the highest of percent of malformations was only 70% (J2) and 40 (J1) in Jiushan River. The interstitial water of sediments in Shanxia River led to the death of all embryos. These results suggested that the toxicity of sediments in Shanxia River was generally higher than that in Jiushan River, and that the interstitial water was more toxic than aqueous sediments extracts. Our study indicates that the sediments of the black-odors rivers have adverse effects on the development of X. tropicalis embryos and show significant ecological toxicity. In addition, X. tropicalisembryos can be used for screening the hazards of sediments effectively.
Space theory on graphs: The linearly independence methods in graph theory (I)
REN Han WU Hao
[Abstract](2243) [PDF 459KB](2162)
Abstract:
In this paper we survey some important results and methods applied in graph theory and related topics. Different from the classical combinatorial matrix methods used in the fields such as the spectral theory of graphs, we concentrate on the finite linearly spaces over various kinds of number fields and their actions and influnces on the structural graph theory.
In-memory index: Performance enhancement techniques leveraging on processors
DONG Shao-Chan, ZHOU Min-Qi, ZHANG Rong, ZHOU Ao-Ying
 doi: 10.3969/j.issn.1000-5641.2014.05.017
[Abstract](1000) [PDF 1068KB](2162)
Abstract:
As main memory capacities grows larger and larger, the memory era has arrived and inmemory databases have taken the place of traditional diskbased databases to provide efficient data management. In this paper, we analyzed the fundamental elements in inmemory index designing: summarized and evaluated the existing index structures, pointing out the future opportunities and challenges based on the development trend of current applications. Finally, we introduced our ongoing distributed inmemory index studies on the Cluster Aware InMemory System (CLAIMS).
Establishment of GPR41 stable cell line and agonist screening of GPR41 receptor
WU Jin, DONG Su-zhen
[Abstract](2370) [PDF 1823KB](2157)
Abstract:
In this study, a stable GPR41 receptor cell model was established. The GPR41 expression was detected by RT-PCR and western blot,while the function of GPR41 was confirmed by cAMP and Ca assays. These results have shown that we have successfully established GPR41 cell line which can be used for screening the agonists of the receptor in vitro. GPR41 receptor binding activity was tested by cAMP assay using secondary metabolites extracted from gulf seaweed aflatoxin c-f-3 in Putian Fujian. The results have also shown that the No.37 compound, a new compound belonging to 2-Pyrones, has GPR41 receptor agonist activity with high affinity. This is the first report on 2-Pyrones with GPR41 receptor agonist activity.
Advertising targeting with user segmentation
GONG Xue-qing, WANG Li, HE Xiao-feng
[Abstract](2029) [PDF 903KB](2157)
Abstract:
Online advertising becomes increasingly important in the E-commerce age. Compared to traditional advertising media such as newspaper and TV channels, online advertising has the advantage of better precise targeting of the ads consumers due to the flexibility of digit content recommendation and personalization. The application of targeting techniques boosts the accurate delivery of ads to interested users. In this paper, we discuss the advance of advertising targeting both in research communities and industry.We show that targeted delivery of the ads by means of user segmentation can greatly increase the CTR of the advertising.
Research on the workflow standards for virtual experiment systems
XUE Yao-feng, WU Yong-he, WU Di, JIANG Wen-bin
[Abstract](2060) [PDF 1246KB](2155)
Abstract:
This paper researches on the structure description problem of workflow of a virtual experiment system (VER). It also defines the information model and the interface standard of workflow of VER. The detailed work procedures and operation cases of VER are presented. It will give the valuable references for researchers and developers of VER.
Predictor homotopy analysis method and its application to two nonlinear systems
JIANG Bing-li, LIU Yin-ping
[Abstract](1475) [PDF 302KB](2155)
Abstract:
Based on traditional homotopy analysis method (HAM), this method (PHAM) introduced a so-called prescribed parameter and associated condition to prove whether a nonlinear differential system admits multiple solutions. The PHAM was applied to two nonlinear differential systems and multiple solutions of associated system were obtained.
Change characteristics of major ions and their influence factors in Yangtze Estuary in recent years
LI Dan, DENG Bing, ZHANG Guosen, ZHANG Yingying
[Abstract](2771) [PDF 2092KB](2148)
Abstract:
The geochemistry of major ions(Ca2+,Mg2+,Na+,K+,HCO32-,SO42-,Cl-,NO3-和SiO32-)in the Yangtze River was studied, based on the monthly monitoring data at Xuliujing station for the period of 2004-2008 and the investigation result of the Yangtze River in September 2008. The study found that the concentration of main ions varies clearly in different seasons, with a negative correlation with the discharge of the River. But the difference of the concentration is less clearly than that of the discharge. There is a persistently increasing in the concentrations of K+, Na+, Ca2+, Mg2+, Cl-, NO3-, SO42-and the ratio of hardness/alkalinity; especially the concentration of SO42-and the ratio of hardness/alkalinity have a more obvious increasing trend. In contrast, the concentration of SiO32-and HCO3-show a decreasing trend. The changes of major ions mainly result from the environment acidification, the pollution emissions by human, the cyclic salt from sea, the preserved effect by reservoirs establishments etc.
Energy decay estimation for the nonlinear viscoelastic equation with nonlinear second-order boundary damping
LU Jun, ZHANG Hong-wei
[Abstract](2426) [PDF 249KB](2140)
Abstract:
The exponential decay estimation of the energy for the nonlinear viscoelastic equation with general damped term was obtained by using Nakao's inequality, and the algebra decay estimation of the energy for the equation with polynomial damped term was given by the same inequality.
Vegetation coverage landscape pattern of Chongming in thebackground of fast urbanization (Chinese)
LI Hong, LI De-zhi, SONG Yun, ZHOU Yan, KE Shi-, WANG Chun-ye, SUN Yu-bing, LI Li-ke, ZHAO Lu-qing
[Abstract](2917) [PDF 4735KB](2136)
Abstract:
By studying the vegetation coverage and it’s pattern during 17 years by means of translation of TM/ETM+ remote sensing images and analysis on the tempo-spatial characteristics of the hierarchical structure of the vegetation coverage, the process of disturbance of urbanization on the natural landscape and the changes in environmental quality were reproduced. The results showed that from 1989 to 2006, along with the rapid development of economy, the vegetation system in Chongming county experienced a process from serious damage to gradual restoration. From 1989 to 2001, the vegetation in both town and farm areas were destroyed seriously. From 2001 to 2006, this tend still existed in the town area, but in the farm area, the vegetation was increased, and the hierarchical structure of the vegetation coverage was improved, which positively contributed to the restoration of the vegetation system in Chongming county.
Chlorinity distribution and water intake operation of the Chenhang Reservoir during saltwater intrusions in the Yangtze Estuary
SHEN Yi-chen, LI Lu, ZHU Jian-rong
[Abstract](1964) [PDF 4209KB](2136)
Abstract:
In order to supply water during severe saltwater intrusions in the Yangtze Estuary, the Chenhang Reservoir sometimes took brackish water. The chlorinity in the reservoir was measured during November 27 in 2009 to March 12 in 2010. Combined with the river discharge, water level, wind stress, chlorinity at the upstream station and its inlet,the saltwater intrusion in the estuary, the way of water intake operation, and temporal/spatial variations of the chlorinity in the reservoir were analyzed. The simulated results showed that, the upstream was tended to be present around its eastern coastline under westward wind. Before the brackish water reached the reservoir, the amount of the water intake was increased to make it to high water level. At the beginning of a saltwater intrusion, the reservoir took the brackish water to keep its higher water level. In the later of the saltwater intrusion, some freshwater was taken from the Baogang Reservoir and the amount depended on the intensity of saltwater intrusion. Furthermore, the water intake from the Yangtze River must be paused when the chlorinity at the supply outlet in the reservoir was close to 250 mg/L. The measured data indicated that the chlorinity of the reservoir was increased when the brackish water in-taking was conducted and experienced a spatial variation under different wind stresses. The water intake operation of the Chenhang Reservoir was dependent on the chlorinity inside/outside it. In addition, its water level, the chlorinity in its upstream as well as the wind stress should also be taken into account. This study can bring experience to the reservoirs built in estuaries for better operation.
Nutrient fluxes at sedimentwater interface in theeast Chongming tidal flat in winter
DENG Ke, YANG Shilun, LIU Sumei, ZHANG Jing
[Abstract](3432) [PDF 2064KB](2133)
Abstract:
Benthic nutrient fluxes and early diagentic processes were investigated in the east Chongming tidal flat of Yangtze estuary in winter. 〖JP2〗Significantly nutrient influxes from water column to sediment are observed in high marsh: benthic fluxes of NO-3, NO-2, NH+4, PO3-4 and SiO2-3 are (-0.896±0.540) mmol/m2/d,(-0.089±0.049) mmol/m2/d,〖JP〗(-2.002±0.642) mmol/m2/d,(-0.068±0.006) mmol/m2/d and (-1.334±0.381) mmol/m2/d individually (negative indicate nutrient absorption from water column to sediment and positive indicate nutrient release from sediment to water column). The exflux of NO-3 ((0.203±0.112) mmol/m2/d) and influxes of NO-2 ((-0.010±0.005) mmol/m2/d) and PO3-4 ((-0.005±0.002) mmol/m2/d) are observed in middle marsh. In low marsh, only PO3-4 ((-0.047±0.009) mmol/m2/d) influx is significant and there are large uncertainty in other nutrient fluxes due to strong wave disturbance. Diffusional nutrient fluxes contribute to the benthic nutrient fluxes slightly. Due to benthic flux differences among nutrients, benthic nutrient exchanges promote the growths of N/P and Si/P ratios in water column.
Nutrient contents of dominant seagrass species and their affecting factors in Hainan Province
YU Zhi-qin, DENG Hong, WU Ke-wei, DU Jing, MA Min
[Abstract](2820) [PDF 730KB](2132)
Abstract:
Nutrient (N, P and Fe) contents of 〖WTBX〗Enhalus acoroides, Cymodocea rotundata〖WTBZ〗 and 〖WTBX〗Thalassia hemperichi〖WTBZ〗 dominated in the seagrass beds in Hainan were studied in this paper. The results indicated that nutrient uptake by inter-tidal seagrass was influenced by both N, P in seawater and chemical characteristics of sediments (N, P, TOC and Fe). Phosphorus concentration of seagrass, which was more sensitive to water and sediment than that of nitrogen, was positively correlated with the level of P in seawater and TOC and total Fe in sediment. Enhanced nutrient level induced by human activates has exerted imbalance of N and P uptake in seagrass, with the leaf N:P of Xincungang (21.73)Lian (14.25) Wenchang (9.53) Tanmen (10.29). The fact that leaf N:P had strong correlation with DTN:DIP in seawater has indicated the influence of eutrophication on the imbalance of nutrient uptake in seagrass.
In-memory cluster computing: Interactive data analysis
HUANG Lan, SUN Ke, CHEN Xiao-Zhu, ZHOU Min-Qi
 doi: 10.3969/j.issn.1000-5641.2014.05.019
[Abstract](1192) [PDF 2056KB](2132)
Abstract:
This paper discussed the management and analysis over data for decision support, which is defined as one of the three categories of big data. In this big data era, business intelligence creates tremendous large market values, while the enhancement in the computer hardware further stimulate the emergence of new data analysis applications, which require interactive data analysis. Based on the detailed analysis of the typical applications, we find that the inmemory cluster computing system will be the future trends for interactive data analysis. In the environment of inmemory cluster computing systems, the network communication has become the main bottleneck when comparing to memory data access and disk I/Os. Hence, the further research topics within the inmemory cluster computing aspects, including the system topology of the distributed sharednothing inmemory computing systems when considering the characteristics of memory (e.g., volatility, memory wall) as well as communication bottleneck, the data placement and index strategies for isomerism, multilevel cache, the parallel computing framework of multi-granularity over multi-core, multi-processor and multicomputer, the data consistency of the distributed data management, data compression and process mechanism over the column wise data storage.
Text classification based on inter-class separability DAG-SVM
HUANG Zhen-long, ZHENG Jun, HU Wen-xin
[Abstract](2206) [PDF 1814KB](2129)
Abstract:
This paper took an improved algorithm based on inter-class separability directed acyclic graph support vector machine (DAG-SVM) for text classification.The method has adjusted the DAG structure according to inter-class distribution and the distance between centers. It has solved the problems of fixed structure and random single node location in traditional DAG-SVM multi-classification method.The experiments show that the algorithm has improved the accuracy.
Normal criterion concerning differential polynomials and omitted functions
WANG Xue, LIU Xiao-jun, CHEN Qiao-yu
[Abstract](1873) [PDF 282KB](2126)
Abstract:
In this paper, we proved: Let $k\geqslant 2$ be a positive integer, $\mathcal{F}$ be a family of holomorphic functions, all of whose zeros have multiplicities at least $k$, and let $h(z)$, $a_1(z)$, $a_2(z)$, $\cdots$, $a_k(z)$ are all nonequivalent to $0$ on $D$. If for any $f\in\mathcal{F}$, the following two conditions are satisfied: (a)~$f(z)=0\Rightarrow |f^{(k)}(z)+a_1(z)f^{(k-1)}(z)+\cdots+a_k(z)f(z)||h(z)|$; (b)~$f^{(k)}(z)+a_1(z)f^{(k-1)}(z)+\cdots+a_k(z)f(z)\neq h(z),$~ where ~$a_1(z), a_2(z),\cdots ,a_k(z)$ and $f$ have no common zeros, then $\mathcal{F}$ is normal on $D$.
Study on the maximum scour depth of piers of a bridge afterreclamation in a hilly, fluvial and macrotidal estuary
HUANG Huiming, WANG Yigang, LI Qi
[Abstract](2957) [PDF 2902KB](2124)
Abstract:
Reclamations in a hilly, fluvial and macrotidal estuary will narrow flood channels. Consequently, it may reduce the safety and stability of hydraulic structures downstream. For this, the paper calculated the maximum scour depth of piers of Yundan Bridge in Fujian province through a 2D numerical model, the semiempire and semitheory formulae about general scour and localized scour. The results indicate that, during flooding period, the scour depth of piers of Yudang Bridge is comparatively serious; so it is necessary to take protecting measures for piers. In addition, influence factors about the maximum scour depth of bridge piers are discussed, and then the conclusion is put forward that actual scour depth of piers hardly reach the calculated amount.
Study on the quantitative relationship of the location of the tidal current limit and the river discharge in the Changjiang Estuary
HOU Cheng-cheng, ZHU Jian-rong
[Abstract](2312) [PDF 4764KB](2119)
Abstract:
The Changjiang Estuary is a tidal estuary with the interaction of river discharge and tidal current. The tidal variation results in the change of flow state in the river. By designing a high resolution numerical model, and based on the calculations of water flux along the river transverse sections, the Changjiang River tidal current limits were obtained in various guarantee rate river discharges in dry and flood seasons. The tidal current limit is between Taiyang island (located at the 70 km upstream of Wuhu) and Zhengjiang hydrological station in dry seasons, and is in the range of 100 km between the middle of Taiping island (located at the upstream Jiangying) and Minzhu island in flood seasons. With the multi power fitting of the calculated results, the relationship between the location of the tidal current limit and the river discharge is y=-410-10x3+110-5x2-0.193 7x+1 232.9(R2=0.984 2) in dry season, and is y=210-13x3+310-8x2-0.007 4x+359.35(R2=0.996 9) in flood season. This result can provide a scientific basis for determining the tidal current limit of the Changjiang River.
Effect of the deep waterway project on the salinities in the north passage of the Changjiang Estuary
FAN Zhong-ya, GE Jian-zhong, DING Ping-xing, PAN Ling-zhi
[Abstract](2611) [PDF 5323KB](2114)
Abstract:
Unstructured-grid Finite Volume Coastal and Ocean Model (FVCOM) has been applied on the north passage, Changjiang Estuary, to study the salinity distribution and its variations under the impacts of different phases of the deep waterway project (DWP). Driven by the same forcings of freshwater discharge, tide and wind, the spring-neap-averaged and typical tidal moments salinity distributions under different phases of DWP are simulated and analyzed The modeling results show that the isohaline has been significantly pushed downstream after Phase I, and continued moving eastward after Phase II. At the same time, the controlling region of isohaline 1~5 has smoothly increased and the vertical mixing effects seem be weakened from the middle to eastern parts of shipping channel. Strong stratification is revealed along the deep channel. After the Phase III, the controlling region of isohaline 1~5 still increases with the upstream direction. The onshore saltwater intrusion has significantly intensified as the increased baroclinic gradient force due to deepened eastern channel.
Study on the relationship between water quality improvement and Nymphaea tetragona physiological diurnal variation in purification tanks
ZHAO Feng, LU Xiao ming;HUANG Min sheng;CHEN Jian jun
[Abstract](2399) [PDF 2063KB](2113)
Abstract:
With the nonaeration(Ⅰ) and aeration(Ⅱ) conditions of two aquatic plant purifyingtanks, the changes of plant physiological traits including the activities of POD, CAT, and the contents of SP, Chla,and the main physical water quality in a day at different times, were observed. Correlation between diurnal variation of plant physiological traits and removal efficiencies of CODCr,NH4+-N,TP were analyzed, and the effect of aeration to plant physiological traits and the purifying effect were studied. The results showed that the plant physiology and the water quality index were affected by the light intensity changes to some extent. The physiological traits of 〖WTBX〗Nymphaea tetragona〖WTBZ〗 had positive correlations with the removal efficiencies of CODCr,NH4+-N, TP. Aeration affected the activities of POD, CAT and the contents of SP, Chla significantly; the water quality of two conditions of purification tanks were affected by the variation of light intensity. The content of DO and the removal efficiencies of CODCr,NH4+-N, TP in the conditionⅡexceeded the conditionⅠby 2.54 mg/L, 21.0%, 16.6% and 14.1%, respectively.
Effects of nutrient management on nutrient utilization of N,P and nitrate accumulation in lettuce
NIAN Yao-ping, XIA Ti-yuan, HE Ming-zhu, ZHANG Jun-guo, DA Liang-jun
[Abstract](2848) [PDF 810KB](2109)
Abstract:
By method of the field plot trial, the experiment was carried out in Dianchi Lake basin to study the influence of different nitrogen and phosphorus fertilizing on lettuce (Lactuca sativa var. ramosa) production, nitrate content and nutrient utilization of N, P. 9 treatments were denoted by T1-T9, respectively. The results showed that: ① The lettuce production of T3(N90P126K180) was higher than other treatments, reaching 28 968.75 kg/ha; except for treatment of T4(N180P126K180)、T5(N270P126K180) and T8(N180P189K180), the contamination levels of nitrate content of the others came out to be Lv.4; after comprehensive consideration on nutrient utilization of N, P, the nutrient utilization of Lettuce showed to be higher after treatments of T4(N180P126K180) and T9(N90P63K180) with 17.42%,2.10% and 20.14%,2.05% respectively. ② Under the same amount of potash fertilizer and the treatment of appropriate nitrogen and phosphorus fertilizers match fertilizing, the corresponding lettuce production, nitrate content and N, P fertilizer nutrient utilization were superior to treatments of partial fertilization or high fertilization. Therefore, control of nitrogen and phosphorus fertilizing, reasonable optimization of ratios of nitrogen and phosphorus will improve the nutrient utilization and vegetables quality, which is of great importance for source controlling the agricultural non-point pollution.
Numerical solution of a non-arbitrage liquidity model based on uncertain volatility
NIU Cheng-hu, ZHOU Sheng-wu
[Abstract](2142) [PDF 546KB](2109)
Abstract:
The option pricing model in illiquidity markets was expanded to general situations by introducing two kinds of uncertain volatility models. As it is difficulty to get analytical solutions for the model in complicated cases, a numerical solution was discussed by establishing corresponding differential equations; and the stability and consistency of the sdution were proved. Finally, the influence of some parameters to the solution was provided in numerical examples. The results show that the algorithm reduced the restriction on step-length requirements, and satisfactory approximation can be found with less computation.
System of variational inclusions with ${(\emph{\textbf{H}},{\bm\phi})}$-$\bm\eta$-monotone operators in Banach spaces
ZHANG Chao
[Abstract](2643) [PDF 202KB](2102)
Abstract:
This paper introduced a new system of variational inclusions with $(H,\phi)$-$\eta$-monotone operators in real uniformly smooth Banach spaces. By using the proximal mapping technique associated with $(H,\phi)$-$\eta$-monotone operators, we proved the existence and uniqueness of solution for this new system and construct a new iterative algorithm for approximating the solution of this system. The convergence of the iterative sequence generated by the iterative algorithm was also discussed. The results extend and improve some known results in the literature.
Soil physical and chemical properties along altitudes ofWestern Tianmushan, Zhejiang (Chinese)
YANG Shu-zhen, MA Yuan, JIANG Ping, JIAO Jing, ZHU Yun-feng, ZHAO Ming-shui, CHEN Xiao-yong
[Abstract](3081) [PDF 1202KB](2101)
Abstract:
In recent years, ancient trees of Cryptomeria japonica var sinensis in Western Tianmushan are declining due to attacks by diseases and insect pests, which were believed to be triggered by acid deposition. The physical and chemical features of soils to provide references for this opinion was analyzed. In this study, soil samples were collected along altitude from 350 m to 1 350 m, with the interval of 200 m. At each sampling site, soil samples were collected from three layers. Soil texture, humidity, bulk density, pH value, organic matter content, contents of total nitrogen and total phosphor were analyzed. Generally, percentage of coarse particles, soil humidity and organic matter content increased with increasing altitude. Soil bulk density and pH value had a declining trend with the increase in altitude. Total nitrogen and phosphor contents had no constant trend along altitude. Compared to the data of 1986 and 1995 years, significant decrease in pH value was observed, indicating a trend of acidification. The observed soil acidification provides evidence for the rapid decline in ancient trees of Cryptomeria japonica var. sinensis triggered by acid deposition.
Pricing option with transaction costs under the subdiffusive Black-Scholes model
GU Hui, ZHANG Yun-xiu
[Abstract](2149) [PDF 289KB](2101)
Abstract:
This paper dealt with the problem of discrete time option pricing by the subdiffusive Black-Scholes model with transaction costs. A subdiffusive geometric Brownian motion was introduced as the model of underlying asset prices exhibiting subdiffusive dynamics. In the presence of transaction costs, by a mean self-financing delta-hedging argument in a discrete time setting, a pricing formula for the European call option in discrete time setting was obtained.
Application of PCR-DGGE to analyze the effect of temperatureon structure of nitrifying bacteria in A2/O system (Chinese)
TAO Fang, HUANG Yan, GAO Shang, HUANG Min-sheng, CHEN Cheng
[Abstract](2795) [PDF 2591KB](2100)
Abstract:
The effects of temperature on the structure of nitrifying bacteria in A2/O system were studied for the purpose of technique improvements and system regulations. Total microbial DNA was extracted from samples which were collected from reactor, then target DNA fragments were amplified from the total DNA using specific bacterial primer. The target DNA were used for denaturing gradient gel electrophoresis(DGGE) analysis. Results indicated that the changes of temperature could affect the community structure and the Shannon diversity index of nitrifying bacteria. The structure of AOB community was stable when the temperature was higher than 25 ℃, the removal rate of NH4+-N was over 95% in this condition; The structure of Nitrobacter community was stable when the temperature was higher than 20 ℃, the removal rate of NH4+-N can reach 95% in this condition; The structure of Nitrospira community changed greatly when the temperature changed, comparatively speaking, the community structure was most stable when the temperature was between 15 ℃ to 20 ℃, the removal rate of NH4+-N was between 75% to 95% in this condition.
Research of codec and geometric correction method for true 3D volumetric display images
TIAN Feng, CAI Wen, ZHAO Fan, CHEN Ming, ZHANG Wen-jun
[Abstract](2344) [PDF 1076KB](2099)
Abstract:
By introducing a true 3D display model, volumetric display technique based on visual voxel was explained. To solve the low-resolution problem of true 3D LED displayer, multi-machine synchronization projection method was proposed. With serial section images of true 3D display, the codec algorithm for true 3D display was studied and geometric correction model based on ray tracing method was built. The experiment proves that this method can build a practical and high-resolution true 3D displayer and can display the object exactly.
Progress in the development of black-odour prediction models for urban rivers
LIU Cheng, HU Zhan-bo, HAO Xiao-ming, BAI Yan-yan
[Abstract](2540) [PDF 839KB](2098)
Abstract:
The paper first analyzed the causes and mechanisms of black-odour in urban rivers, then provided a review on the achievements on methods and approaches for black-odour evaluation. A number of black-odour assessment models were collected together and then compared with each other. Four widely used models: the multiple linear regression model, the organic pollution index model, the multi-factor weighted index model and the comprehensive water quality identification index model were selected and analyzed. The trend of evaluation model building on black-odour in urban rivers was prospected in the end.
Harnack estimate for the Schrodinger equation under Ricci flow
WANG Jian-Hong
[Abstract](2220) [PDF 241KB](2096)
Abstract:
This paper established the gradient estimate and Harnack inequalities of the Schrodinger equation when the metric is evolved by Ricci flow, and extended the results ofthe heat equation by C.M.Guenther
$\lambda$ point and $\lambda$ property in generalized Orlicz spaces with Luxemburg norm
SHI Zhong-rui, ZHAI Jia-yu
[Abstract](2083) [PDF 219KB](2095)
Abstract:
In this paper, we gave the sufficient and necessary conditions of $\lambda$ point in a generalized Orlicz function space equipped with the Luxemburg norm, by methods used in classical Orlicz spaces and new methods introduced especially for generalized ones. The results indicate the difference between points in the unit balls of classical and that of generalized Orlicz spaces: all of the classical spaces are $\lambda$ points, but some of the generalized spaces are not. Finally, we gave the criteria of the $\lambda$ property and the uniform $\lambda$ property of generalized spaces.
Thomassen and coloring graphs on surfaces
REN Han, CHAO Fu-gang
[Abstract](1492) [PDF 380KB](2095)
Abstract:
The research of coloring graphs on surfaces originated from Heawood map color theorem. With an analysis based on the primary source, we survey the work of Thomassen, such as three color theorem and list coloring, coloring graphs on surfaces, and chromatic polynomial and number of colorings. His work has been concerned by many mathematicians, such as Mohar, Thomas and Hutchinson.
Direct sum decomposition of $\overline{\emph{\textbf{U}}}_{{\bm r},{\bm s}}\textbf{(}{\bm s}{\bm l}_{\bf 2}\textbf{)}$ about principal indecomposable modules
TONG Zhao-jia, HU Nai-hong
[Abstract](4215) [PDF 444KB](2094)
Abstract:
This paper described a class of irreducible modules of the restricted two-parameter quantum group $\overline{U}_{r,s}(sl_2)$, and constructed all its principal indecomposable modules. Finally, the minimal polynomial of the action of the Casimir element on $\overline{U}_{r,s}(sl_2)$ and all the conjugate classes of the primitive idempotents of $\overline{U}_{r,s}(sl_2)$ were obtained.
Prolongation structure of the coupled nonlinear evolution equation
JIA Yang-jie
[Abstract](2109) [PDF 238KB](2091)
Abstract:
The coupled KdV equation proposed by is investigated in the framework of prolongation structure theory. Its Lax representation of prolongation algebra is constructed.
Study on the effects of Mg2+ on the binding between Bloom syndrome helicase and G4DNA
LUO Heng, CAI Ming-juan, CHEN Xiang, DING Mei, LI Kun, XU Hou-qiang,
[Abstract](2599) [PDF 978KB](2091)
Abstract:
This paper studied the effects of Mg2+ on G4DNA, BLM-G4DNA complex, and the binding of BLM642-1290 helicase and G4DNA using fluorescence anisotropy technology.The results indicated that the fluorescence anisotropy of G4DNA increased with Mg2+ concentration (〖WTBX〗P〖WTBZ〗0.01); The anisotropy of BLM-G4DNA complex showed varied tendency of decrease-increase-decrease with Mg2+ concentration (〖WTBX〗P〖WTBZ〗0.01);The anisotropy of the binding between the helicase and G4DNA gradually declined following Mg2+ concentration (〖WTBX〗P〖WTBZ〗0.01); The binding was most likely to occur between the helicase and G4DNA when Mg2+ concentrations was 3.0 mmol/L, which suggested that the suitable amount of Mg2+ could promote the binding of the helicase and G4DNA but that could lead to the change of the binding properties of two molecules including the shape, flow ability, and charge. These results provided useful data for studying the interaction mechanism between BLM helicase and G4DNA.
Research on the effect of the sand mining depth in a braided channel
ZHANG Qiang, ZHANG Xiao-feng
[Abstract](3049) [PDF 1674KB](2088)
Abstract:
A 2-D horizontal model with generalized curvilinear coordinates was applied to simulate flow and sediment transports in the Tianxingzhou reach of the Yangtze River. The model was first calibrated and verified using field data. The variations in the velocity distribution and water surface level were then simulated for the conditions of different flow discharges and different depths of sand mining. The model was also used to forecast the change of the reach and the sedimentation efficiency in mining areas after sand mining through selected typical flow and sediment conditions. The results provide necessary information for quantifying effects of sand mining at different scales.
Community structure and biodiversity of birds in Tuohu Nature Reserve, Anhui Province
BAO Fang-yin, WANG Song, ZHANG Tao, WANG Bang-zheng, CUI Feng
[Abstract](2870) [PDF 670KB](2086)
Abstract:
During April 2008 to May 2009, a sysmetic bird community survey was conducted in Tuohu Nature Reserve, Anhui Province, China. A total of 69 species belonging to 13 orders 33 families were recorded, of which 42 species belong to Palaeartic birds (62.0%), and 6 species to Oriental (8.5%). The species of Paleartic are dominant, and in terms of migration 12 species (16.9%) are residents, while 57 species (83.1%) are migratory birds,of which 2 species are in the national grade-one protection list, 6 species in the national grade-two protection list ,and 31 species in Anhui provincial protection list. The bird species diversity shows clear seasonal variation. The management of the protection of the birds, as well as local resources, is also discussed in this paper. Bird diversity index varies with seasons and the living environment. The data shows that diversity index of the habitat of mire is the maximum (1.368 1), and next to it is the habitat of forest (1.258 6), farmland (0.805 9) and water body (0.739 0). However, the habitat of residential area is the minimum (0.642 0). The evenness index of water habitat (0.380 0) is the maximum, and next to it is that of the mire (0.376 1), forest (0.360 0) and farmland (0.314 2). After all, the index of residential area is the minimum (0.267 7). In Huaihe River Basin, Tuohu Lake survives the winter and thus serves as an important route in the migration for the multitudinous waterfowls on the way, and the function of this basin wetland waterfowl protection. The results indicate that the water birds are facing the threats from the environmental degradation and human activity in the area.
Identification of genes associated with age-related memory impairment in rats
ZHANG Shuang, WANG Lin, DONG Su-zhen
[Abstract](2128) [PDF 372KB](2085)
Abstract:
A large body of evidence indicates that memory impairment is associated with normal aging. Interestingly, some older individuals do not show any memory loss. To understand the molecular mechanisms of the age-related memory disorder, gene expression profiles of hippocampus and entorhinal cortex from 24-month-old memory-impaired and maze were examined using high-density DNA microarrays. The results demonstrated that 47 genes in the hippocampus and 37 genes in the entorhinal cortex showed dynamic changes in their expressions levels. Surprisingly, the overall patterns of gene expression changes in these two brain regions were significantly different. Nevertheless, a number of key genes involved in structure organization, neurotransmission, signaling transduction, transcription, immunity and oxidative signaling were differently expressed in both brain regions. These genes and signal pathways may play essential roles in the regulation of memory. Our results provided important information for understanding the molecular mechanism of age-related memory impairment.
Distribution of soil heavy metal and pollution evaluation in Chongming Island (Chinese)
ZHOU Yan, LI De-zhi, SONG Yun, LI Hong, KE Shi-zhen, WANG Chun-ye, SUN Yu-bing, LI Li-ke, ZHAO Lu-qing
[Abstract](4253) [PDF 1446KB](2082)
Abstract:
The distribution maps of heavy metals in soils of Chongming county were drawn using Kriging method in the geo-statistic module of ArcGIS,and the degrees of pollution were evaluated using the single-facter pollution index (SPI) and comprehensive pollution index (CPI).The results showed that the degrees of pollution of heavy metals in soils of Chongming County were CdZnCuCrPb. Among the heavy metals, Cd was the major one. The average SPI of Cd in the soil samples was 1.05, reaching the light degree of pollution.The comprehensive pollution index of 5 heavy metals including all soil samples, ranged from 0.22 to 2.59 with an average of 0.88, reaching the alarm degree of pollution. However, The overall situation of heavy metals in soils were relatively clean, because there were still 72.39% of soil samples showing the cleanness.
Representation theorem of generators for BSDEs with infinite time intervals
ZHANG Heng-min, FAN Sheng-jun
[Abstract](1922) [PDF 289KB](2082)
Abstract:
Under the non-uniform Lipschitz condition (in $t$) of the generator $g$ with respect to $(y,z)$ for backward stochastic differential equations (BSDEs), a representation theorem of generators and a converse theorem of solutions were established for BSDEs with a finite or an infinite time intervals, which extend some existing results.
Representation theorem for AVaR under a submodular capacity
TIAN De-jian, JIANG Long, JI Rong-lin
[Abstract](1209) [PDF 184KB](2082)
Abstract:
From the viewpoints of quantile functions, we gave the definition of AVaR of financial positions under a capacity. Then, using the classical results of AVaR under the probability measure, we established the representation theorem for AVaR under the submodular capacity. As a byproduct of this representation theorem, we proved that AVaR under a submodular capacity is a coherent risk measure, which generalized the classical results.
Influencing factors of water transparency in landscape water bodies of parks and public green space, Shanghai
YU Li-fan, SHI Miao-xiao, DA Liang-jun, YAN Xiao, YIN Jun-guang
[Abstract](2371) [PDF 1348KB](2081)
Abstract:
Taking 107 landscape water bodies in 90 parks and public green space of Shanghai as study objects, the relationship between water transparency and light attenuation coefficient was quested and therefore the main influencing factors upon water transparency were studied in this paper with application of outdoor investigation and indoor experiments. The results showed that: (1) the water transparency generally stayed at a low level with mean value of (0.540.24) m, and more than 98.31% water bodies were below 1.0 m; (2) there was a significant negative correlation between water transparency and light attenuation coefficient, which could be shown as Kd=0.017+〖SX(〗1.12〖〗ST〖SX)〗; (3) the suspended matter was the main influencing factors of transparency in landscape water bodies of parks and public green space in Shanghai. The total phosphorus and ammonia-N in the water affected water transparency out of their nutrient control over phytoplankton. The results offer a new measurement to assess the water quality, especially the water transparency of landscape water bodies scientifically, and hence will provide a scientific basis for the improvement of water environments, the establishment of aquatic vegetation and the maintenance and management of water bodies.
Altered white matter architecture among college athletes: A diffusion tensor imaging study
SHEN Guo-hua, ZHANG Jian, WANG Hui, WU Yin, ZENG Yu-wen, DU Xiao-xia
[Abstract]<