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Articles by Chen Wang
Total Records ( 8 ) for Chen Wang
  Hamzah Abdul-Rahman and Chen Wang
  Problem statement: Conventional solar concentrators are only sensitive for the beam radiation and they function poorly in overcast sky conditions. Even under a clear sky condition, trackers are always needed for conventional solar concentrators. Static concentrators always come with a poor concentration rate without a tracker and the light concentrated by normal Luminescent Solar Concentrators (LSC) could not be transported by optical fibers to a remote place since the light produced by LSCs is not a pointolite. Approach: Through a critical literature review and discussion, this article retrospects the merits and demerits of recent conventional solar concentrators and Luminescent Solar Concentrators (LSC). Results: Results summarized the limitations in current day lighting related solar concentration devices. As an approach for energy saving, daylight has a disadvantage of not being able to reach many areas of a building such as store rooms, basements and corridors and it also brings heat gain with the light. Light pipes were designed to transport daylight to unreached areas, but light pipes have their difficulties for wiring, so that optical fibers are considered as the best approach for the daylight transportation so far. However, the optical fiber needs a pointolite for the light transportation. Various solar concentrators that were designed using optical approaches such as using mirrors or lens for the solar energy concentration. Since they are only sensitive for the beam irradiation, they function poorly in the cloudy weather and the diffuse light conditions and even if they are under a clear sky condition, trackers are always needed. Luminescent Solar Concentrators (LSC) and some static solar concentrators were then designed as the diffuse light solution and the static solution, respectively. Static concentrators always come with a low concentration rate without a tracker and the light concentrated by normal LSCs could not be transported by optical fibers to a remote place since the light produced by an LSC is not a pointolite. Conclusion/Recommendations: New solar concentration systems need to be developed to mitigate the above-mentioned limitations. Future studies especially cross disciplinary researches on developing new solar concentrators in mitigating those limitations as discussed in this study are highly recommended.
  Yong Zhou , Jianing Mi , Nannan Yu and Chen Wang
  A model of the pharmaceutical manufacturing system is established in this paper to analyze how government policies affect pharmaceutical manufacturers’ business decision. The government policies considered includes inventory buy-back and pre-order. In the model, the manufacturer is assumed to minimize its financial risk while satisfying various other constraints and the conditional value-at-risk of the loss function of the manufacturer is used to measure the risk associated with its manufacturing plans. Simulation results show that government intervention can reduce the risk of manufacturers significantly. These results also serve as a reference for other countries to implement their own pharmaceutical manufacturing regulatory policies.
  Qiumin Xiang , Junguo Zhang , Xin Luo , Yuying Cheng and Chen Wang
  Wildlife monitoring is the basis of effective protection, sustainable use and scientific management of wildlife resources. In order to obtain image information of wildlife monitoring remotely and in real time, wireless multimedia sensor network was introduced to the field of wildlife monitoring. The key of acquiring and transmitting image through wireless multimedia sensor network is image compression. However, the traditional image compression algorithm is not suitable for wireless multimedia sensor network owing to its computational complexity, long compression time, large volume of compression data and other shortcomings. The compressed sensing theory put forward in recent years, has achieved a low-speed sampling signal coding and accurate reconstruction and greatly reduces the computational complexity and also provides a new way of thinking to improve the conventional image compression algorithm. This study demonstrates the advantages of using wireless multimedia sensor network to monitor wildlife and expounds the basic principle of compressed sensing theory and its application in image compression. On this basis, the study also discusses the possibility that image compression algorithm based on compressed sensing theory is applied to wireless multimedia sensor network. Last but not the least, it is confirmed that image compression algorithm based on compressed sensing theory is suitable for wireless multimedia sensor network by doing the simulation experiments in MATLAB.
  Kai Zhang , Wu Zhao , Chen Wang , Ling Chen and Junsong Zhang
  Based on the characteristics of product innovation design, product innovation was designed into several stages: requirements analysis, problem-finding, problem-analyzing, problem-solving, innovative solution-generation and solution-evaluating. To help designers find problems, analyze the problems and solve the problems, the innovation model based on problem-solving was developed and the approaches to find problem were presented. In addition, different types of problems in product innovation design were analyzed; a systematic model supporting problem representation was put forward. Based on internal variable of the problem, the problems were divided into four grades and the strategies for solving each grade of problems were presented. Besides, several examples were cited to demonstrate the feasibility of the models and methods. Finally, a preliminary prototype software system of computer-aided design for product innovation was developed.
  Lizhen Wu , Xiaohong Hao and Chen Wang
  The voltage optimization control is one of the most important problems in distribution networks. In this paper a multi-objective voltage optimizes control modeling is presented, which including objectives that are the total active power losses; the voltage deviations of the bus and the total emission. Moreover, a new optimization algorithm based on a fuzzy improved Honey Bee Mating Optimization (HBMO) algorithm is proposed to determine the best operating point for reactive power generation and the active power generated by Wind turbine and Photovoltaic. In the proposed algorithm, the mating process is corrected; also a fuzzy clustering technique is used to control the size of the repository within the limits, where a set of non-dominated (Pareto) optimal solutions are stored. Finally, the proposed algorithm is tested on a typical IEEE 33-bus distribution test systems. The results of the simulation show the effectiveness of the proposed algorithm.
  Hui Guo , Xiao-Jun Shao , Jun Li , Chen Wang , Gao-Mai Yang , Min-Yue Duan and Feng-Xing Zhang
  A new bidisplaced acetate functionalized pendant arm derivative, 1,4-diacetate-1,4,7-triazacyclodecane (L) and its corresponding Co(III), Fe(III) complexes [CoLCl] (1) and [FeLCl]2 · 3H2O (2) were synthesized and characterized by elemental analysis, IR spectra,UV-Vis spectra, HNMR, MS, XPRD, TGA and single-crystal X-ray diffraction analysis. The crystal structure shows the metal ions in the complexes have similar coordination six-coordinate, by three nitrogens and two oxygens of the chelate ligand, and a chloride. Through calculation of the twist angle, we discover 1 forms a distorted octahedral geometry while 2 forms a distorted-prismatic geometry. In 2, there are abundant hydrogen bonds between the oxygen atoms of water and the nitrogens and oxygens of the ligand, resulting in a two-dimensional supramolecular network with a regular triatomic water cluster. The thermal gravimetric analyses of the two complexes are also given.
  Chen Wang , Jun Li , Yan-Wei Ren , Fei-Gang He , Giuseppe Mele and Feng-Xing Zhang
  A dinuclear diamagnetic copper(II) complex, [Cu2(ophen)2]Cl2 (Hophen = 2-hydroxy-1,10-phenanthroline), has been synthesized and characterized, providing good structural evidence for the long-debated Gillard mechanism.
  Chen Wang , John T. Norton , Supurna Ghosh , Julie Kim , Kazuo Fushimi , Jane Y. Wu , M. Sharon Stack and Sui Huang
  RNA processing is altered during malignant transformation, and expression of the polypyrimidine tract-binding protein (PTB) is often increased in cancer cells. Although some data support that PTB promotes cancer, the functional contribution of PTB to the malignant phenotype remains to be clarified. Here we report that although PTB levels are generally increased in cancer cell lines from multiple origins and in endometrial adenocarcinoma tumors, there appears to be no correlation between PTB levels and disease severity or metastatic capacity. The three isoforms of PTB increase heterogeneously among different tumor cells. PTB knockdown in transformed cells by small interfering RNA decreases cellular growth in monolayer culture and to a greater extent in semi-solid media without inducing apoptosis. Down-regulation of PTB expression in a normal cell line reduces proliferation even more significantly. Reduction of PTB inhibits the invasive behavior of two cancer cell lines in Matrigel invasion assays but enhances the invasive behavior of another. At the molecular level, PTB in various cell lines differentially affects the alternative splicing pattern of the same substrates, such as caspase 2. Furthermore, overexpression of PTB does not enhance proliferation, anchorage-independent growth, or invasion in immortalized or normal cells. These data demonstrate that PTB is not oncogenic and can either promote or antagonize a malignant trait dependent upon the specific intra-cellular environment.
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