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Online First articles are peer-reviewed and accepted for publication. They are posted online prior to technical editing formatting for publication and author proofing.
Display Method:
An algorithm for precise image registration based on priori mark features
LIU Tianbi, FENG Rui
Accepted Manuscript  doi: 10.3969/j.issn.1000-5641.202021006
[Abstract](6) [FullText HTML](5)
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.
Review of deep learning in cognitive radio
LIU Bo, BAI Xiaodong, ZHANG Gengxin, SHEN Jun, XIE Jidong, ZHAO Laiding, HONG Tao
Accepted Manuscript  doi: 10.3969/j.issn.1000-5641.201922017
[Abstract](36) [FullText HTML](38)
Abstract:
The development of wireless communication has made spectrum resources increasingly scarce. Existing spectrum resources, however, are not currently used in an efficient way. This contradiction can usually be attributed to the problem created by static spectrum allocation strategies. Cognitive radio (CR) is widely regarded as a feasible solution to solve the problem of static spectrum allocation. In recent years, deep learning, an emerging field of machine learning, has contributed to a number of notable research and application achievements. It has become one of the driving technologies behind artificial intelligence. In this paper, we investigated the application of deep learning to CR; this includes the development of cognitive radio and deep learning as well as the usage of deep learning models in key technologies for CR (such as spectrum prediction, spectrum environment sensing, signal analysis, etc.). Lastly, we summarize and discuss conclusions from this review.
A certificate management system for the completion of online education based on blockchain technology
HUANG Libo, WANG Wei, XU Yanjun, CHEN Xugang
Accepted Manuscript  doi: 10.3969/j.issn.1000-5641.201921019
[Abstract](27) [FullText HTML](18)
Abstract:
In the current educational environment, online education lacks credible proof of completion. After learning courses on the online education platform, the students cannot get a credible certificate of completion; the completion certificate given by a few educational platforms cannot be recognized by the society because of its centralized storage, which limits the development of online education. In order to solve these problems, the blockchain-based online education completion certificate management system is designed and implemented by using the characteristics of decentralization and non-tampering of the blockchain. The electronic certificate of completion is in the form of digital assets, and the student's learning record is kept in the certificate of completion, which guarantees the authenticity and reliability of the certificate. On this basis, based on the Hyperledger Fabric, smart contracts such as certificate generation and distribution are realized to ensure that they do not need to be operated by third parties. At the same time, multiple query interfaces are provided by the system, such as the historical trace of the certificate, which improve the efficiency of verification of online education platform learning outcomes; in addition, online education courses are recorded in blockchain in the form of publisher’s assets, which enhances copyright protection in online education.
The adoption process for disruptive innovation: A theoretical analysis
WANG Ye, QU Linchi
Accepted Manuscript  doi: 10.3969/j.issn.1000-5641.202021002
[Abstract](99) [FullText HTML](39)
Abstract:
Looking back on history, we observe that many industries generate disruptive innovations intermittently. It is worth noting that those who adopt new technologies for commercialization are usually not the incumbent leading companies with the strongest technical and financial strength, but rather companies that are established later in time, who operate on a smaller scale and with less technical strength. This article explains this phenomenon based on a two-stage game model. The advantages of incumbent companies in traditional technologies often become obstacles in their switch to innovative technologies. Companies established later in time can leverage the late-comer advantage to strategically reduce profits of new technology products, thereby blocking incumbent enterprises from the new product market.
2020, No.3 Date: 2020-05-29 Previous Issue
Display Method:
Estuary and Coastal Research
A discussion on the diversion process of tide-dominated estuary bifurcation: The North Branch estuary of the Yangtze River
LU Jiayu, GE Jianzhong, DING Pingxing
 doi: 10.3969/j.issn.1000-5641.201941015
[Abstract](16) [FullText HTML](44) [PDF 1350KB](0)
Abstract:
The North Branch estuary of the Yangtze River is a typical tide-dominated estuary with bifurcation. The hydrodynamics and diversion processes are the major factors in sediment transport and geomorphology evolution of the tide-dominated estuary. This paper is based on data from the bottom tripod system and a cross-section survey of the North Branch in April 2018, whereby the dominant flow of each channel is calculated. The results show that during the spring tide cycle, the Santiao Port and the Guyuansha south waterway are flood-dominated and the net tidal current flows landward, whereas the Guyuansha north waterway is ebb-dominated, and the net flow has a seaward direction. Moreover, a high-resolution numerical FVCOM model is used to simulate the diversion process of the North Branch estuary. The results suggest that: the cross-sectional area of Guyuansha south waterway is much bigger than that of the north waterway, and the propagation direction of the lateral tide is consistent with the orientation of the Guyuansha south waterway, which mainly has onshore movement through the Guyuansha south waterway. The spatial distribution of the flood tide flow is significantly uneven in these two waterways. Meanwhile, tidal current from the Guyuansha south waterway crosses the shallow shoal and reaches the north waterway. It produces a net flow with the seaward direction through the north waterway. The flood-tide and ebb-tide diversion ratio of the Guyuansha north waterway are 29.7% and 47.2%, respectively, during the spring tide period and 41.6% and 43.1%, respectively, during the neap tide period. The residual patterns indicate that the tidal current enters the estuary from the south waterway and exits through the north waterway. These indicators and diversion characteristics can help predict estuarine sediment transport and geomorphological evolution processes within an individual bifurcated channel.
Numerical simulation of saltwater intrusion mitigation by building a sluice in the North Branch of the Changjiang Estuary
ZHU Jianrong, LU Peiyi, TANG Chuanmin, CHEN Qing, LÜ Hanghang
 doi: 10.3969/j.issn.1000-5641.201941017
[Abstract](16) [FullText HTML](28) [PDF 1118KB](1)
Abstract:
The most prominent feature of saltwater intrusion in the Changjiang Estuary is the saltwater spillover from the North Branch into the South Branch during the dry season; the spillover is the only source of saltwater for the Dongfengxisha, Taicang, and Chenhang Reservoirs as well as the main source of saltwater for the Qingcaosha Reservoir. A three dimensional numerical saltwater intrusion model, validated on the Changjiang Estuary, was applied to simulate and analyze salinity variation both during and after construction of the sluice at the upper reaches of the North Branch; the model considered tide, climatic river discharge, and wind in January and February. The simulated results showed that the South Branch is occupied by freshwater, the phenomenon of saltwater spillover from the North Branch vanishes and the salinity in the upper reaches of the North Branch decreases substantially after building the sluice. The salinity at the water intakes of the Dongfengxisha, Taicang, and Chenhang Reservoirs approaches 0. The salinity at the water intake of the Qingcaosha Reservoir decreases significantly and is less than 0.45 and there is freshwater at all time. The operation of the sluice in the numerical experiments is adopted in two ways. One is open during ebb current, closed during flood current in the daytime, and open during flood current in the nighttime. The other is open during ebb current and closed during flood current in the daytime and nighttime. The salinity variations in the South Branch with the two operational schemes are nearly identical. This can be attributed to the fact that the saltwater intrusion in the upper reaches of the North Branch is substantially reduced by the former sluice operational scheme, and a freshwater area with salinity approaching 0.45 appears. Even though the sluice is open during day flood current, the water entering the South Branch is freshwater and the total seaward residual current in the South Branch is enhanced. Considering the numerical simulation results and operation costs, the former sluice operational scheme is recommended. The water intake time is significantly improved, not only for the Dongfengxisha, Chenhang, and Qingcaosha Reservoirs in Shanghai, but also for the Taicang Reservoir in Jiangsu; moreover, security in water supply is ensured for both places.
Influence of water level rise on currents and saltwater intrusion in the Changjiang Estuary
TANG Chuanmin, ZHU Jianrong
 doi: 10.3969/j.issn.1000-5641.201941001
[Abstract](56) [FullText HTML](42) [PDF 1378KB](6)
Abstract:
A semi-implicit estuarine, coastal, and ocean model (ECOM-si) was used to simulate and analyze the influence of a rise in water level on runoff, tidal and wind-driven currents, and on current and saltwater intrusion under the combined effects of various dynamic factors. In a scenario where the water level rises 30 cm in the Changjiang Estuary, numerical simulation results show that seaward runoff decreases due to augmentation of the river transection area; tidal currents decrease slightly with increases in water depth; the wind-driven current by northerly winds in the dry season is enhanced, which flow landward in the North Channel and seaward in the South Channel forming horizontal circulation; and the wind-driven current in the North Branch is strengthened. After the water level rise, saltwater intrusion in the North Branch is enhanced; salinity changes slightly in the middle reaches of the South Branch; the most distinct areas of saltwater intrusion enhancement are in the North Channel and North Passage, where the salinity rise is greater than 1 in neap tide and is somewhat reduced in spring tide; the salinity rise in the northern outlet of the North Channel reaches the maximum value observed in the entire estuary; and salinity on the shoal at the river mouth of the South Passage reduces because the water level rises and the nonlinear effect weakens. The water level rise, moreover, results in a salinity increase at the water intake of the three reservoirs (Qingcaosha, Chenhang, and Dongfengxisha) in the water source of the South Branch, which reduces water intake time and affects the safety of the water supply.
Impact of the South-to-North Water Diversion Project on saltwater intrusion and freshwater resources in the Changjiang Estuary
SU Aiping, LÜ Hanghang, WU Yufan
 doi: 10.3969/j.issn.1000-5641.201941031
[Abstract](18) [FullText HTML](10) [PDF 1243KB](1)
Abstract:
The South-to-North Water Diversion Project is an interbasin water diversion project, whose impact on changes in freshwater resources in the Changjiang Estuary is of widespread interest. In this paper, we used a 3D numerical model of estuarine saltwater intrusion to study the impact on saltwater intrusion and freshwater resources in the Changjiang Estuary from both short-term and long-term perspectives. The study, moreover, was focused on the eastern and middle route water transfer schemes of the Project. The results indicate that during the neap-spring tide period in mid-to-late February, the unavailable water intake time, corresponding to salinity greater than 0.45 at the water inlets of the Dongfengxisha, Chenhang, and Qingcaosha is 7.74, 3.08, and 2.72 days, respectively. In the case of a short-term water transfer scheme at river discharge of 1 000 m3/s, saltwater intrusion is intensified, especially at the river mouths of the North Channel, North and South Passages, and in the upper reaches of the North Branch, where salinity rise is most noticeable and a large area shows a salinity rise greater than 0.5; meanwhile, the supply of freshwater in the South Branch decreases. During the neap-spring tide period in mid-to-late February, the unavailable water intake time at the water inlets of the Dongfengxisha, Chenhang and Qingcaosha Reservoirs increases by 1.43, 2.14 and 2.13 days, respectively. In the case of long-term water transfer schemes at river discharge of 1 600 m3/s, the salinity rise in the entire estuary is even more noticeable; a large area of salinity rise greater than 1 shows up on the river mouths of the North Channel, North and South Passages, and a small area of salinity rise greater than 1.5. The supply of freshwater in the South Branch also decreases. During the neap-spring tide period in mid-to-late February, the unavailable water intake time at the water inlets of Dongfengxisha, Chenhang, and Qingcaosha Reservoirs increases by 1.49, 3.08, and 3.08 days, respectively.
Numerical simulation of erosion and deposition at the water intake channel of the outer seawall sluice in the ecological restoration project area of Chongming Dongtan Bird Habitat
LU Peiyi, ZHU Jianrong, QIAN Weiwei, YUAN Lin
 doi: 10.3969/j.issn.1000-5641.201941013
[Abstract](16) [FullText HTML](21) [PDF 1248KB](1)
Abstract:
A three-dimensional numerical model for erosion and deposition at the water intake channel of the outer seawall of Chongming Dongtan Bird Sanctuary was established based on the hydrodynamic model of the estuary coupled with the sediment module and the bottom erosion and sedimentation equation. The model’s upstream boundary condition at the sluice was specified with water flux calculated by the Weir formula, where the inner water level was calculated by the hydrodynamic model of the Suitang River. The model’s downstream boundary condition of the water level, salinity and sediment concentration were calculated by the large domain numerical model of the Changjiang Estuary. We measured bottom elevations at the water intake channel before and after the sluice opening from July 28 to July 30, 2018 and found that the calculated model elevations were in general agreement with the measured values, indicating that the model can accurately simulate erosion and sedimentation changes. The calculation results for scouring and siltation show that under natural conditions, the water intake channel becomes level after 60 days of sluice closure because of sediment deposit. Siltation is largest near the sluice and gradually decreases with distance from the sluice to the sea. After the water intake channel was naturally silted for two months, the mean erosion thickness at the water intake channel was 96 mm in the case where Suitang River accumulated up to 3.0 m of water and discharged thereafter, 133 mm in the case where Suitang River accumulated up to 3.8 m of water and discharged thereafter, and 625 mm in the case where Suitang River accumulated up to 3.0 m of water and the sluice was opened to receive tidal water. Leaving the sluice open to receive tidal water is the most effective way for scouring sediment in the water intake channel. The research results provide scientific and technical guidance for the protection and management of the ecological restoration project area in Chongming Dongtan National Nature Reserve and the scouring sediment scheme of the water intake channel.
The development and application of a physical-biogeochemical coupling model based on FVCOM
SHI Shenyang, GE Jianzhong, CHEN Jianzhong, ZHENG Xiaoqin, DING Pingxing
 doi: 10.3969/j.issn.1000-5641.201941008
[Abstract](22) [FullText HTML](18) [PDF 1394KB](1)
Abstract:
By combining the hydrodynamic model FVCOM with the biological model ERSEM, based on FABM, this paper develops a new physical-biogeochemical model: FVCOM-FABM-ERSEM. The combined model is suitable for application to coastal areas and is one of the most comprehensive ecosystem models for the lower trophic levels of the marine food-web. Using the combined model, a one-dimensional vertical (1DV) model and a three-dimensional Changjiang Estuary model were established. The results of the 1DV model were consistent with observation data from the European L4 Station. This paper also simulates the physical and biogeochemical processes of Changjiang Estuary from 2013 to 2016 with the 3D Changjiang Estuary model. The distribution of temperature, salinity, nitrate, phosphate, and chlorophyll-a levels were all found to be consistent with observation data from cruises and MODIS data in the spring when algal blooms occur. The characteristics of the front dynamics of Changjiang Estuary were well represented. The relationship between salinity, turbidity, nutrients, and chlorophyll around the plume front was determined through modeling, indicating a significant co-occurrence effect along the front of physical and biological processes.
Effects of silver nanoparticles on dissimilatory nitrate reduction in estuarine and tidal sediments
ZHANG Mengxia, ZHENG Yanling, YIN Guoyu, DONG Hongpo, HAN Ping, GAO Juan, LIU Cheng, CHANG Yongkai, LIU Min, HOU Lijun
 doi: 10.3969/j.issn.1000-5641.201941005
[Abstract](43) [FullText HTML](26) [PDF 906KB](5)
Abstract:
Human activity can cause accumulation of silver nanoparticles (AgNPs) in estuarine and coastal environments; however, the effects of accumulated AgNPs on nitrogen transformation remain unclear. This study investigated the effects of AgNPs on dissimilatory nitrate reduction to ammonium (DNRA) rates in Yangtze estuarine and intertidal sediments using exposure experiments with three different sizes of AgNPs (10 nm, 30 nm, and 100 nm) and three different AgNPs concentrations (0.1 mg/L, 5 mg/L, and 10 mg/L). The results showed that AgNPs inhibited DNRA rates of sediments with different salinity levels, but the inhibition did not increase significantly with time. AgNPs had relatively high inhibition in medium salinity areas depending on the physical properties of the respective sediments. Moreover, it was shown that both the size and concentration of AgNPs were important factors affecting their toxicity. When the concentration of AgNPs was ≤ 5 mg/L, the inhibition of 10 nm AgNPs on the DNRA rate was greater than those of 30 nm and 100 nm AgNPs; the strongest inhibition effects among different salinities reached 16.03% (at 0.2‰ salinity), 20.27% (at 8.0‰ salinity), and 15.36% (at 20‰ salinity). However, when the concentration of AgNPs was 10 mg/L, the inhibition of 30 nm and 100 nm AgNPs on the DNRA rate under the same salinities increased to 17.48%, 33.18%, and 26.45%, respectively; these values were larger than the inhibition of 10 nm AgNPs. There was no significant correlation between Ag+ concentration and the inhibition of AgNPs on the DNRA rate (p > 0.05), indicating the inhibitory effect of AgNPs on the DNRA rate could not be fully explained by the toxicity of Ag+. These results are of great significance to understand the influence of emerging pollutants on the estuarine nitrogen cycle.
Response of nitrogen removal in the overlying water to sediment resuspension in the intertidal wetlands of the Yangtze Estuary
ZHANG Hongli, YIN Guoyu, ZHENG Yanling, GAO Juan, GAO Dengzhou, CHANG Yongkai, LIU Cheng
 doi: 10.3969/j.issn.1000-5641.201941007
[Abstract](17) [FullText HTML](14) [PDF 1290KB](1)
Abstract:
The 15N isotope tracer technique was used to examine the response of denitrification and anammox to sediment resuspension in the intertidal wetlands of the Yangtze Estuary. The results showed that both denitrification and anammox rates were positively correlated with the turbidity of the overlying water, which demonstrates that sediment resuspension can promote the occurrence of nitrogen removal processes in overlying water. The denitrification and anammox rates showed significant spatial differences due to the physiochemical characteristics at different sites under sediment resuspension and was mainly attributed to the sediment TOC contents. In addition, the abundance of nirS and anammox bacterial 16S rRNA genes increased with suspended sediment turbidity, which indicates that sediment resuspension could increase the abundance of nitrogen removal functional bacteria, thus promoting nitrogen removal rates. These results indicate that sediment resuspension has important influence on nitrogen transformation processes and facilitates nitrogen removal in intertidal wetlands.
Material flux variation and mechanism analysis of different rivers originating from the Tibetan Plateau
ZHANG Xiaocheng, JIANG Xuezhong
 doi: 10.3969/j.issn.1000-5641.201941006
[Abstract](81) [FullText HTML](38) [PDF 978KB](6)
Abstract:
Many large rivers in Asia originate from the Tibetan Plateau. Changes in the rivers reflect not only changes in the Tibetan Plateau itself, but also relate closely to water resource utilization in the respective basin countries. Changes in terrestrial materials entering the sea reveal the impact of human activities on land-sea interactions in the basin. With changes in natural conditions and socio-economics, material flux from the basin has evolved over time. In this resarch, material flux was compared quantitatively by analysis of the water discharge, sediment load, and nutrient volumes for elements such as nitrogen, phosphorus, and silicon in the Yangtze, Yellow, Mekong, Indus, Ganges, and Brahmaputra Rivers. In addition, the mechanism of variation was discussed by comparison of two phases of land use and land cover in 1995 and 2015, which were extracted from remote sensed image mapping. The results revealed that the runoff of the Yangtze, Indus, and Brahmaputra Rivers decreased significantly from 1995 to 2015, but the Ganges increased over the same period. The Mekong River runoff changed slightly and fluctuated year to year. However, the sediment transportation from river to sea in the Yangtze, Yellow, and Indus Rivers reduced substantially at a statistically significant level (p < 0.05). In terms of nutrient element flux, the dissolved inorganic nitrogen (DIN) of the Yellow and Mekong Rivers showed an upward trend and the Yangtze River DIN decreased by about 26.5%. The total phosphorus and silicon flux in the Yangtze and Mekong Rivers did not change much, while the dissolved inorganic phosphorus (DIP) in the Yellow River decreased. The nitrogen and phosphorus flux was mainly affected by runoff, and the silicate flux was influenced by variations in sediment loads. Furthermore, dam construction, usage of pesticides and fertilizers, and changes in land use have changed the proportion of nutrient elements. An increase in industrial activity, agricultural development, and water conservancy facilities, resulted in a higher total nitrogen and phosphorus flux and more significant reduction in sediment loads. Understanding the material flux data of each basin is of great significance for management departments to build basins with common goals and use water resources reasonably and effectively.
Evaluation of the effectiveness of a coastal ecological restoration project based on ecosystem services: A case study on Yingwuzhou Wetland, China
WU Wei, LI Caixia, CHEN Xuechu
 doi: 10.3969/j.issn.1000-5641.201941027
[Abstract](17) [FullText HTML](15) [PDF 692KB](4)
Abstract:
For the last three years, Yingwuzhou Wetland has been operating as the first national-level artificial coastline restoration pilot project in Shanghai; it is important for decision makers, builders, and administrators to understand the effectiveness of the project. In this paper, we study eight key indicators of ecosystem services to evaluate project performance, namely plant supply, water purification, carbon sequestration, climate regulation, wind and wave elimination, biodiversity conservation, recreation, and research and education. The results show that the total value of ecosystem services in Yingwuzhou in 2018 was 437.6 × 104 yuan·a–1, and the value per unit area was 18.9 × 104 yuan·hm–2·a–1; the proportional ranking of services can be classified as follows: Cultural Services (45.6%) > Regulation Services (41.9%) > Supporting Services (12.4%) > Provisioning Services (0.1%). The evaluation results show that the value of ecosystem services on the coastline of Yingwuzhou Wetland is significantly improved after ecological restoration; ecosystem services, moreover, are centered on culture and ecology, and the service area has localization characteristics, which has a noticeable effect on improvement of the ecological environment quality at the Jinshan coastline. The results of this study will help to visualize the effectiveness of the restoration of Yingwuzhou Wetland. The research methods can serve as a reference for the evaluation of similar ecological restoration projects in coastal zones.
Geography
Review of driving factors for land degradation and restoration based on IPBES
GUO Xiaona, CHEN Ruishan, LI Qiang, PAN Zhenzhen
 doi: 10.3969/j.issn.1000-5641.201941009
[Abstract](13) [FullText HTML](8) [PDF 782KB](3)
Abstract:
Land degradation is one of the major global ecological problems that is endangering the health and well-being of 3.2 billion people, threatening food and water security, and reducing biodiversity. Land degradation, moreover, is triggering regional conflicts, large-scale migration and the spread of disease, and has raised widespread concerns from international organizations such as the UN, IPBES, and IPCC in recent years. Understanding the drivers of land degradation is fundamental to preventing land degradation and restoring degraded land. This paper examines the drivers of land degradation based on a land degradation and restoration assessment report from the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES). The factors that lead to land degradation can be divided into direct (human) drivers, indirect (human) drivers, and climate change. This paper elaborates on eight types of direct drivers for land degradation, namely grazing land management; cropland and agroforestry management; forests and tree plantation management; non-timber natural resource extraction; fire regime change; extractive industry and energy development; construction, industrial development, and urbanization; and invasive species. This research also explores indirect driving factors and their respective mechanisms, including: population, economy, technology, institution and management, and culture as well as mechanisms (i.e. interaction effects) that are situation-dependent, nonlinear or abruptly-changing, and remotely coupled. The research notes that climate change can also lead to various types of land degradation. Finally, this article reviews driving factors for land degradation in typical areas of China and proposes relevant preventive and response measures. An in-depth understanding of the drivers for land degradation will provide decision making support for “the governance of mountains, water, forests, cropland, lakes, and grass ecosystems” as well as the construction of “Beautiful China”.
Evaluating service accessibility of residential care facilities in Shanghai for fulfilling basic needs
CHEN Jie, WU Jianping, GUO Peijun, YAO Shenjun
 doi: 10.3969/j.issn.1000-5641.201841038
[Abstract](137) [FullText HTML](98) [PDF 1265KB](2)
Abstract:
Appropriate assessment of the service accessibility of residential care facilities is important for making policies on the allocation of residential care resources. In accordance with policy requirements for the service of residential care facilities in Shanghai, this study modifies the traditional Two-step Floating Catchment Area (2SFCA) method by introducing a power function as a distance decay relationship, employing multi-radius service areas, using the shortest driving distance to measure the distance parameter, and introducing administrative restrictions. With the proposed method, residential care services were calculated and analyzed at the town level. Service accessibility results were then compared under two scenarios. The results show that service accessibility of Shanghai residential care facilities is far below the planning targets for 2020. Less than 1/3 of the towns had service accessibility values with at least 35 beds per thousand elderly people. Comparing the results from two scenarios studied, we found that administrative barriers resulted in lower accessibility for most towns, especially in urban areas where the elderly population density is high; consequently, this significantly enlarged the rural-urban divide.
Urban and Regional Science
A microclimatic impact analysis on multi-dimensional indicators of urban road fabric: Empirical research on Shanghai
JIANG Yunfang, HAN Xuemei, SHI Tiemao, SONG Danran
 doi: 10.3969/j.issn.1000-5641.201941004
[Abstract](20) [FullText HTML](13) [PDF 1422KB](2)
Abstract:
Different historical backgrounds and planning ideas result in different road fabrics for a city. Road fabric patterns affect urban microclimate factors and form a unique local microclimate. In this paper, we studied the road fabric of four “city” areas in Shanghai (i.e., the old downtown area, Gubei international community, Anting new town, and new Jiangwan town) by simulating the microclimate of the four research areas using ENVI-met4.3 software; we then used the data to compare the microclimate status of urban fabric at the medium and micro levels. At the medium level, the relationship between width, orientation, spacing, connectivity, and the climate environment was analyzed. At the micro level, the effects of Near-line Rate, Height to Wide ratio (H/W) and Sky View Factor (SVF) on the distribution characteristics of microclimate factors in roads were analyzed. The comparative analysis of microclimate characteristics at the “city” scale provides useful insights for urban climate adaptability in urban design projects and spatial morphology optimization in future urbanization development.
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](10847) [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](10359) [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](7771) [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](7491) [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](7379) [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](6709) [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](6433) [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](6138) [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](5722) [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](5600) [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](5722) [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](5315) [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](4460) [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](4367) [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](1571) [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](1831) [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](5164) [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](3785) [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](3083) [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](1924) [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](2886) [PDF 144KB](4293)
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](1629) [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](6433) [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](1422) [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](2519) [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](2612) [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](4062) [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](4000) [PDF 4857KB](3722)
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](2561) [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](3305) [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](4018) [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](1116) [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](1953) [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](3869) [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](3272) [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](5098) [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](2896) [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](4957) [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](1817) [PDF 1319KB](3326)
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](3116) [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](3422) [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](3355) [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](3621) [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](1881) [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](1345) [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](3196) [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](1852) [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](3311) [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](2616) [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](2060) [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](1076) [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](2665) [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](1251) [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](3646) [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](2549) [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](3401) [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](2335) [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](2369) [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](2222) [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](5309) [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](2664) [PDF 3106KB](2636)
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](2161) [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](2434) [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](2193) [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](1970) [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](4576) [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](3180) [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](1512) [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](3395) [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](2182) [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](3289) [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](1917) [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](2976) [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](2455) [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](3415) [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](1703) [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](3106) [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](1033) [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](1559) [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](4202) [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](2632) [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](2029) [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](3233) [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](3181) [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](2057) [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](1876) [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](1053) [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](3467) [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](2203) [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](1559) [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](2249) [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](7491) [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](2781) [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](3010) [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](2866) [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](2044) [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](2911) [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](1570) [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](2326) [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](2596) [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](2517) [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](1945) [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](1939) [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](2260) [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](1014) [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](2296) [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](2744) [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](3282) [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](2892) [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](1061) [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
  • Chart
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  • List
2020  No. 2 PP. 1-139 No. 1 PP. 1-178
2019  No. 6 PP. 1-185 No. 5 PP. 1-202 No. 4 PP. 1-211 No. 3 PP. 1-210 No. 2 PP. 1-208 No. 1 PP. 1-165
2018  No. 6 PP. 1-130 No. 5 PP. 1-194 No. 4 PP. 1-194 No. 3 PP. 1-233 No. 2 PP. 1-180 No. 1 PP. 1-170
2017  No. 6 PP. 1-163 No. 5 PP. 1-235 No. 4 PP. 1-179 No. 3 PP. 1-152 No. 2 PP. 1-147 No. 1 PP. 1-142
2016  No. 6 PP. 1-202 No. 5 PP. 1-172 No. 4 PP. 1-176 No. 3 PP. 1-155 No. 2 PP. 1-159 No. 1 PP. 1-133
2015  No. 6 PP. 1-189 No. 5 PP. 1-171 No. 4 PP. 1-163 No. 3 PP. 1-146 No. 2 PP. 1-140 No. 1 PP. 1-251
No. S1 PP. 1-540
2014  No. 6 PP. 1-140 No. 5 PP. 1-350 No. 4 PP. 1-179 No. 3 PP. 1-163 No. 2 PP. 1-178 No. 1 PP. 1-142
2013  No. 6 PP. 1-201 No. 5 PP. 1-160 No. 4 PP. 0-127 No. 3 PP. 1-218 No. 2 PP. 1-166 No. 1 PP. 1-144
2012  No. 6 PP. 1-156 No. 5 PP. 1-144 No. 4 PP. 1-196 No. 3 PP. 1-170 No. 2 PP. 1-129 No. 1 PP. 1-150
2011  No. 6 PP. 1-151 No. 5 PP. 1-132 No. 4 PP. 1-141 No. 3 PP. 1-144 No. 2 PP. 1-170 No. 1 PP. 0-202
2010  No. 6 PP. 1-198 No. 5 PP. 1-148 No. 4 PP. 1-140 No. 3 PP. 1-148 No. 2 PP. 1-140 No. 1 PP. 1-141
2009  No. 6 PP. 1-140 No. 5 PP. 1-141 No. 4 PP. 1-140 No. 3 PP. 1-124 No. 2 PP. 1-140 No. 1 PP. 1-140
2008  No. 6 PP. 1-136 No. 5 PP. 1-140 No. 4 PP. 1-139 No. 3 PP. 1-124 No. 2 PP. 1-140 No. 1 PP. 1-138
2007  No. 6 PP. 0-136 No. 5 PP. 1-140 No. 4 PP. 1-140 No. 3 PP. 1-140 No. 2 PP. 1-140 No. 1 PP. 1-140
2006  No. 6 PP. 1-136 No. 5 PP. 1-140 No. 4 PP. 1-140 No. 3 PP. 1-140 No. 2 PP. 1-140 No. 1 PP. 1-140
2005  No. 5/6 PP. 1-216 No. 4 PP. 1-112 No. 3 PP. 1-112 No. 2 PP. 1-112 No. 1 PP. 1-143
2004  No. 4 PP. 1-141 No. 3 PP. 1-112 No. 2 PP. 1-112 No. 1 PP. 1-111
2003  No. 4 PP. 1-109 No. 3 PP. 1-112 No. 2 PP. 1-112 No. 1 PP. 1-112
2020
2020  No. 2  PP. 1-139
2020  No. 1  PP. 1-178
2019
2019  No. 6  PP. 1-185
2019  No. 5  PP. 1-202
2019  No. 4  PP. 1-211
2019  No. 3  PP. 1-210
2019  No. 2  PP. 1-208
2019  No. 1  PP. 1-165
2018
2018  No. 6  PP. 1-130
2018  No. 5  PP. 1-194
2018  No. 4  PP. 1-194
2018  No. 3  PP. 1-233
2018  No. 2  PP. 1-180
2018  No. 1  PP. 1-170
2017
2017  No. 6  PP. 1-163
2017  No. 5  PP. 1-235
2017  No. 4  PP. 1-179
2017  No. 3  PP. 1-152
2017  No. 2  PP. 1-147
2017  No. 1  PP. 1-142
2016
2016  No. 6  PP. 1-202
2016  No. 5  PP. 1-172
2016  No. 4  PP. 1-176
2016  No. 3  PP. 1-155
2016  No. 2  PP. 1-159
2016  No. 1  PP. 1-133
2015
2015  No. 6  PP. 1-189
2015  No. 5  PP. 1-171
2015  No. 4  PP. 1-163
2015  No. 3  PP. 1-146
2015  No. 2  PP. 1-140
2015  No. 1  PP. 1-251
2015  No. S1  PP. 1-540
2014
2014  No. 6  PP. 1-140
2014  No. 5  PP. 1-350
2014  No. 4  PP. 1-179
2014  No. 3  PP. 1-163
2014  No. 2  PP. 1-178
2014  No. 1  PP. 1-142
2013
2013  No. 6  PP. 1-201
2013  No. 5  PP. 1-160
2013  No. 4  PP. 0-127
2013  No. 3  PP. 1-218
2013  No. 2  PP. 1-166
2013  No. 1  PP. 1-144
2012
2012  No. 6  PP. 1-156
2012  No. 5  PP. 1-144
2012  No. 4  PP. 1-196
2012  No. 3  PP. 1-170
2012  No. 2  PP. 1-129
2012  No. 1  PP. 1-150
2011
2011  No. 6  PP. 1-151
2011  No. 5  PP. 1-132
2011  No. 4  PP. 1-141
2011  No. 3  PP. 1-144
2011  No. 2  PP. 1-170
2011  No. 1  PP. 0-202
2010
2010  No. 6  PP. 1-198
2010  No. 5  PP. 1-148
2010  No. 4  PP. 1-140
2010  No. 3  PP. 1-148
2010  No. 2  PP. 1-140
2010  No. 1  PP. 1-141
2009
2009  No. 6  PP. 1-140
2009  No. 5  PP. 1-141
2009  No. 4  PP. 1-140
2009  No. 3  PP. 1-124
2009  No. 2  PP. 1-140
2009  No. 1  PP. 1-140
2008
2008  No. 6  PP. 1-136
2008  No. 5  PP. 1-140
2008  No. 4  PP. 1-139
2008  No. 3  PP. 1-124
2008  No. 2  PP. 1-140
2008  No. 1  PP. 1-138
2007
2007  No. 6  PP. 0-136
2007  No. 5  PP. 1-140
2007  No. 4  PP. 1-140
2007  No. 3  PP. 1-140
2007  No. 2  PP. 1-140
2007  No. 1  PP. 1-140
2006
2006  No. 6  PP. 1-136
2006  No. 5  PP. 1-140
2006  No. 4  PP. 1-140
2006  No. 3  PP. 1-140
2006  No. 2  PP. 1-140
2006  No. 1  PP. 1-140
2005
2005  No. 5/6  PP. 1-216
2005  No. 4  PP. 1-112
2005  No. 3  PP. 1-112
2005  No. 2  PP. 1-112
2005  No. 1  PP. 1-143
2004
2004  No. 4  PP. 1-141
2004  No. 3  PP. 1-112
2004  No. 2  PP. 1-112
2004  No. 1  PP. 1-111
2003
2003  No. 4  PP. 1-109
2003  No. 3  PP. 1-112
2003  No. 2  PP. 1-112
2003  No. 1  PP. 1-112