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Search Results: 1 - 10 of 7902 matches for " Weiwei Xian "
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Temporal and spatial patterns of the ichthyoplankton community in the Yangtze Estuary and its adjacent waters

Shude Liu,Weiwei Xian,

生物多样性 , 2009,
Abstract: 根据2007年长江口及其邻近水域4个航次调查资料, 探讨了该水域的鱼类浮游生物群落物种组成和多样性的季节变化特征。结果表明, 2007年共捕获鱼类浮游生物6,463个, 隶属12目28科45种, 以鳀科丰度最高, 占总丰度的76.5%。长江口鱼类浮游生物包括4种生态类型: 淡水型(2种), 半咸水型(14种), 沿岸型(10种)和近海型(16种)。 其中, 近海型物种个体数量最多, 占2007年长江口鱼类浮游生物总丰度的74.55%。鳀(Engraulis japonicus)在4个季节均有出现, 对长江口鱼类浮游生物丰度贡献最大。鱼类浮游生物在物种组成上存在明显的季节变化: 白氏银汉鱼(Allanetta bleekeri)在春季占绝对优势, 鳀是夏季优势度最高的种类, 秋季除鳀外, 前颌间银鱼(Hemisalanx prognathus)成为优势种; 鱼类浮游生物丰度高度集中在优势种上, 各季节优势种对总丰度贡献超过89%。群落物种数量、丰度、丰富度指数、均匀度指数和多样性指数, 在夏季最高, 春季和秋季次之, 冬季最低。长江口鱼类浮游生物群落物种组成和多样性的季节变化特征体现了鱼类繁殖迁移策略和鱼类对环境变异的响应。
Dynamic Pricing of Perishable Products with Competition  [PDF]
Weiwei Ji
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.33010

With the development of product development technology and the rapid rise of online retailing, the market competition becomes increasingly fierce. Based on consumer utility function, this article established a two-stage dynamic pricing model and discussed pricing strategies under consumer behavior and market competition. Findings indicate that product quality difference and consumer valuation decreasing coefficient determine the order of the consumer purchase decisions. The firm who provides lower-quality products suffered more loss than the firm who provides high-quality products.

Research on the Influence of the Characteristics of Independent Director to the Quality of Internal Control Self-Assessment Report  [PDF]
Weiwei Huang
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.66064
Abstract: This article selects the empirical data from Shanghai A share, using multiple linear regression model to discuss the impact to the quality of the internal control self-assessment report from four aspects of the characteristic of the independent directors. The conclusions are that the number of independent directors, the independent directors’ proportion and the auditing professional background of independent directors are positively correlated with the quality of internal control self-assessment report, and the age of the independent directors, the independent directors’ reward and the location consistency of the independent directors and the company are negatively correlated with the quality of internal control self-assessment report. Finally, this paper gives four suggestions.
Research on Enterprise Internationalization Strategy Based on Path Dependence Theory: Literature Review and Future Prospect  [PDF]
Weiwei Yang
American Journal of Industrial and Business Management (AJIBM) , 2017, DOI: 10.4236/ajibm.2017.711087
Abstract: Although there are many kinds of literature on the internationalization of enterprises and strategic path dependence research were reviewed, there are no scholars on the path dependence theory perspective of the enterprise international strategy research specifically reviewed. In this paper, the literature review method is used to review the literature on the international strategic path of enterprises. First of all, the focus of combing the relevant literature involved in the concept, characteristics, the origin and development of the theory. Then, this paper introduces some scholars’ related discussions on the internationalization path dependence of enterprises. Finally, on the basis of these, the future direction of the research on the path dependence of the internationalization of enterprises is put forward from the aspects of cognitive perspective, dynamic capability theory and theoretical framework.
Relative Widths of Some Sets of lmp  [PDF]
Weiwei Xiao, Weijun Luan
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.12008
Abstract: n this paper, the relative widths of some sets in are studied. Relative widths is the further development of Kolmogorov widths and it is a new problem in approximation theory which aroused some mathematics workers great interest recently. We present some basic propositions of relative widths and investigate relative widths of some sets (ball or ellipsoid) of
Analysis of University Science Research Capability Elements and Evaluation Based on BP Neural Network  [PDF]
Weiwei Liu, Chunsheng Shi
Journal of Service Science and Management (JSSM) , 2008, DOI: 10.4236/jssm.2008.13030
Abstract: After analyzing effect elements of University Science Research Capability (USRC) based on dynamic capability theory, combined the substance of university science research with the highly self-organized, self-adapted and self-learned characteristics of Back Propagation (BP) Neural Network, the paper conducts a research on evaluation of USRC, in which an evaluation index system of USRC is constructed and a 15-7-1-typed BP Neural Network with three layers is presented to evaluate USRC, which provides a BP Neural Network-based methodology for evaluation of USRC with multiple inputs.
A Fast Depth-Map Generation Algorithm based on Motion Search from 2D Video Contents  [PDF]
Weiwei Wang, Yuesheng Zhu
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.512B028
Abstract: Generation of a depth-map from 2D video is the kernel of DIBR (Depth Image Based Rendering) in 2D-3D video conversion systems. However it occupies over most of the system resource where the motion search module takes up 90% time-consuming in typical motion estimation-based depth-map generation algorithms. In order to reduce the computational complexity, in this paper a new fast depth-map generation algorithm based on motion search is developed, in which a fast diamond search algorithm is adopted to decide whether a 16x16 or 4x4 block size is used based on Sobel operator in the motion search module to obtain a sub-depth-map. Then the sub-depth-map will be fused with the sub-depth-maps gotten from depth from color component Cr and depth from linear perspective modules to compensate and refine detail of the depth-map, finally obtain a better depth-map. The simulation results demonstrate that the new approach can greatly reduce over 50% computational complexity compared to other existing methods.
American Values Reflected in Names of US Supermarkets, the Top Five Values and American Dream  [PDF]
Zhong Wang, Weiwei Fan
Open Journal of Modern Linguistics (OJML) , 2013, DOI: 10.4236/ojml.2013.34045
Abstract: This study based its foundation on a qualitative study of organizations that are closely related to people’s daily life—supermarkets, more exactly supermarket names and analyzed values represented in these names. 211 supermarket names were collected and values were extracted from these subjects, then the frequency and frequency rates of each individual value were calculated by SPSS 17. At last, 20 values were obtained. Among them, the top five values were individualism, directness, nature, cultural identity, efficiency and practicality, which respectively took up 19.8%, 7.9%, 5.8%, 5.3% and 5.3%. Individualism, one of the dominant values in American society, ranked the first in terms of frequency rate, representing people’s desire in memorizing their achievement and success as well as demonstrating personal responsibilities; directness showed people’s straightforward way of expression; nature demonstrated the fervent love for nature and the original and simple ways of solving problems, and nature also symbolized the “return for nature”; cultural identity, also collective identity, meant people’s identification as a member of a group; efficiency and practicality were to seek the fast and cheapest way of achieving a goal. What was surprising was the reflection of nature and cultural identity, which were rarely mentioned as belonging to core American values. Besides, the American Dream values, covering individualism, competition, freedom, pioneering spirit, superiority and nationalism, constituted about 27% of the totality of frequency rate, which proved the unwavering charm of American dream in American society.
The Application of Cluster Analysis in the Classification of China’s Modern Service Industries  [PDF]
Weiwei Yang, Ran Miao
Journal of Service Science and Management (JSSM) , 2014, DOI: 10.4236/jssm.2014.76035
Abstract: The current classified researches on the modern service industries are mainly based on the state statistical standards and for the practical consideration. However, these researches which based on qualitative analysis and experience are not enough for the further study of the industrial development and internal structure relationship of the modern service industries. By further definiting the connotation and characteristics of the modern service industries, this paper selects the quantitative indexes reflecting the development of the modern service industries and adopts cluster analysis to make a quantitative research on the classification of the modern service industries from the position of the academic research and the perspective of the development of the industry internal structure, hoping to lay some foundation for the further theoretical studies of modern service industries.
Identification of the Strike-Slip Faults in Central Junggar Basin and Discussion on Its Petroleum Geological Significances  [PDF]
Shuhua Wang, Weiwei Li
Open Journal of Yangtze Oil and Gas (OJOGas) , 2016, DOI: 10.4236/ojogas.2016.11003
Abstract: The Central Block 2 of Junggar Basin is located in the center of the basin, whose Jurassic fractures were considered to be characterized by reverse fault. However, from the recent studies with the methods of coherent and curvature, they showed that the “flower” structure developed at Jurassic showing a “Y” type in seismic section. The fractures spread in “Yan Line” (the shape is the flying wild goose) in plane, and have “dolphin” effect in space. Therefore, it was suggested that the Jurassic fractures were dominant by dextral strike-slip fault. This finding had great significance in improving hydrocarbon reservoirs exploration and trap evaluation in this area
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