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Search Results: 1 - 10 of 91575 matches for " Ren Chen "
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RETRACTED: Coupling Numerical Simulation and Field Experiment to Optimize Vegetation Arrangement for Pleasant Outdoor Wind Environment in Residential District  [PDF]
Bo Hong, Fang Chen, Peng Ren
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.64037
Abstract: Short Retraction Notice

The paper does not meet the standards of \"Journal of Environmental Protection\".

This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

Editor guiding this retraction: Prof. Qingren Wang (EiC of JEP)

The full retraction notice in PDF is preceding the original paper, which is marked \"RETRACTED\".
Generalized thermal resistance for convective heat transfer and its relation to entransy dissipation
Qun Chen,JianXun Ren
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0526-8
Abstract: In order to further analyze and optimize convective heat transfer process further, the concepts of heat flux weighted average heat temperature and heat flux weighted average heat temperature difference in multi-dimensional heat transfer system were introduced in this paper. The ratio of temperature difference to heat flux is defined as the generalized thermal resistance of convective heat transfer processes, and then the minimum thermal resistance theory for convective heat transfer optimization was developed. By analyzing the relationship between generalized thermal resistance and entansy dissipation in convective heat transfer processes, it can be concluded that the minimum thermal resistance theory equals the entransy dissipation extremum theory. Finally, a two-dimensional convective heat transfer process with constant wall temperature is taken as an example to illustrate the applicability of generalized thermal resistance to convective heat transfer process analysis and optimization.
Positive Solutions of Fractional Differential Equation with -Laplacian Operator
Teng Ren,Xiaochun Chen
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/789836
Abstract:
Study of Species Biodiversity of Arthropod Community in Chestnut Orchard
REN Shuang,CHEN Bin
Journal of Chongqing Normal University , 2009,
Abstract: A systematic and atochastic investigation into species biodiversity of arthropod community in chestnut orchard is carried out in Hechuan, Chongqing in 2001-2004. 12 orders, 63 families and 136 species of arthropods are collected in the investigation, in which identified 120 special occupy 88% of tatal collected species. The species list and the composition of arthropod community are presented, and the ecological and economic significance of major species is discussed in the paper. The seasonal quantity dynamics of major classification groups in top part of chestnut orchard in 2001 are analyzed, and the Homopteran is shown to be the predominant group through the seasons. Moreover, the seasonal quantity dynamics of the quantity and Shannon-Wiener biodiversity index of whole community are pest and natural enemy sub-community in top part of chestnut orchard in 2001 are analyzed as well. In brief, the investigation has established an overall framework of information for the species biodiversity of arthropod community in chestnut orchard in Chongqing, which may facilitate the understanding of chestnut orchard ecosystem and an integrated pest control of the chestnut orchard.
Architecture Support for Behavior-based Adaptive Checkpointing
Nianen Chen,Shangping Ren
Journal of Software , 2008, DOI: 10.4304/jsw.3.2.61-68
Abstract: Checkpointing is a commonly used approach to provide system fault-tolerance. However, using a constant checkpointing frequency may compromise the system’s overall performance when there are multiple types of QoS requirements involved. Hence, it is important that the checkpointing frequency is customizable and runtime adaptable. However, for open distributed and embedded applications, often there is a large number of entities involved in an application and these entities may join or leave the system frequently. The scale and the dynamicity make it difficult to apply the adaptive checkpointing strategy unless we have a model that encapsulates the issues within a well- defined structure and further shields complexity from application developers. In this paper, we introduce a behavior-based adaptive checkpointing approach for open systems and present an architecture support to optimize system’s overall performance through using adaptive checkpointing frequencies.
Homotopy Analysis Method for Large-Amplitude Free Vibrations of Strongly Nonlinear Generalized Duffing Oscillators  [PDF]
Youhua Qian, Dongxu Ren, Shengmin Chen, Lin Ping
Modern Mechanical Engineering (MME) , 2012, DOI: 10.4236/mme.2012.24022
Abstract:

In this study, the homotopy analysis method (HAM) is used to solve the generalized Duffing equation. Both the frequencies and periodic solutions of the nonlinear Duffing equation can be explicitly and analytically formulated. Accuracy and validity of the proposed techniques are then verified by comparing the numerical results obtained based on the HAM and numerical integration method. Numerical simulations are extended for even very strong nonlinearities and very good correlations which achieved between the results. Besides, the optimal HAM approach is introduced to accelerate the convergence of solutions.

Diversity of Cultivable Actinomycetes in Tropical Rainy Forest of Xishuangbanna, China  [PDF]
Yi Jiang, Xiu Chen, Yanru Cao, Zhen Ren
Open Journal of Soil Science (OJSS) , 2013, DOI: 10.4236/ojss.2013.31002
Abstract:

In order to obtain much more un-known actinomycetes for discovering new drug lead, one hundred soil samples were collected from five national natural protection areas of tropical rain forests, Mengla, Menglun, Mandian, Xiaomengyang and Guanping, in Xishuangbanna, Yunnan, China. 1652 purified cultures of actinobacteria were isolated from these samples by using 5 media. The 16S rRNA gene sequences of 388 selected strains were analyzed, and the phylogenetic analysis was carried out. 35 genera which belong to 8 orders and 14 families of the Class actinobacteria were identified. It is showed from research results that actinomycete diversity in tropical rain forest of Xishuangbanna is the highest comparing with all areas studied in our laboratories before. Selective isolation methods for un-known actinomycetes from soil samples, including medium and inhibitors are discussed in this paper.

The ODM Model and Co-Evolution in the Global Notebook PC Industry: Evidence from Taiwan  [PDF]
Daniel You-Ren Yang, Yun-Chung Chen
Advances in Applied Sociology (AASoci) , 2013, DOI: 10.4236/aasoci.2013.31009
Abstract: This paper aims to explore the evolutionary dynamics of the ODM model in the global notebook PC industry. We found that the “modular design” process of notebook products requires plenty of technical interaction and tacit knowledge exchanges among branding companies, key component suppliers and ODMs. Taiwanese ODMs serve as important sources of information and knowledge for specifications formulation through their system integration and technological development abilities. With increasing complexity and shorter design life-spans, the mutual dependency among the lead firms and ODMs increases, leading to the regional agglomeration in Taiwan and China.


Adaptive Rate Control for Multi-Antenna Multicast in OFDM Systems  [PDF]
Qinghe Du, Pinyi Ren, Yi Jia, Zhigang Chen
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2029
Abstract: We propose two rate control schemes for multi-antenna multicast in OFDM systems, which aim to maximize the minimum average rate over all users in a multicast group. In our system, we do not require all multicast users to successfully recover the signals received on each subcarrier. In contrast, we allow certain loss for multicast users, such that the multicast transmission rate can be increased. We assume that the loss-repairing can be completed at upper protocol layers via advanced fountain codes. Following this principle, we formulate the rate control problem via beamforming in multi-antenna multicast to optimize the minimum achievable rate for all multicast users. While the computation complexity to solve for the optimal beamformer is prohibitively high, we propose a suboptimal iterative rate control scheme. Moreover, we modify the above optimization problem by selecting a ?xed proportion of users on each subcarrier. The beamformer searching process will then be performed only based on the selected users on each subcarrier, such that the complexity can be further reduced. We also solve this new problem with a low complexity approach. Theoretical analyses and simulation results show that our proposed two rate control schemes can have higher minimum average rate than the baseline scheme without rate control, while achieving low complexity.
A Novel Cooperative Multicast Scheme Based on Fountain Code  [PDF]
Qinghe Du, Pinyi Ren, Jincheng Lu, Zhigang Chen
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2028
Abstract: Multicast is an efficient way to support emerging multimedia services over wireless network. Fountain codes are used in multicast systems to enable a robust transmission without CSI feedback and ARQ. We propose a cooperative multicast scheme based on fountain code to improve the performance of multicast. The users are coordinated with each other to decode the message at different time slots within the data transmission of a multicast session. Speci?cally, we take the local channel state information (CSI) and the local residual energy information (REI) into consideration, and apply a relay-selection and power-allocation strategy in our cooperative multicast scheme to prolong the network lifetime, while keeping the transmission delay as low as possible. The simulation results show that the proposed scheme can achieve a good tradeoff between transmission delay and network lifetime.
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