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Search Results: 1 - 10 of 78211 matches for " CHEN XiaoChao "
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Thermal Conductivity and Microstructure Properties of Porous SiC Ceramic Derived from Silicon Carbide Powder  [PDF]
Xiuwen Wu, Hongwen Ma, Xiaochao Chen, Zhanbing Li, Jie Li
New Journal of Glass and Ceramics (NJGC) , 2013, DOI: 10.4236/njgc.2013.31007
Abstract: Porous SiC ceramic were prepared with silicon carbide powder as the aggregate, silicone resin as the binder and pore agent by the process of mixing, iso-static pressure molding, and calcination. The mechanical properties and microstructures of the samples were characterized with a universal testing machine, X-ray diffraction, scanning electron microscope, and mercury injection. Two main factors, molding pressures and silicone resin mass ratio were studied in the experiments. The thermal conductivity of the samples was tested. The compressive strength was up to 19.4 MPa, and the porosities up to 30%. The thermal conductivities, mainly influenced by porosities, increased from 0.68 W.m-1.K-1 to 1.03 W.m-1.K-1 with the porosity decreasing from 41.96% to 31.30%.
Association of β-fibrinogen gene 148C/T and 455G/A polymorphisms and coronary artery disease in Chinese population: A Meta analysis
XiaoChao Chen,MingTong Xu,LiZi Jin,Jian Chen,WeiQing Chen
Science China Life Sciences , 2008, DOI: 10.1007/s11427-008-0102-0
Abstract: The purpose of our study was to evaluate the correlation between the β-fibrinogen gene 148C/T and 455G/A polymorphisms and susceptibility to coronary artery disease in the Chinese population using a meta-analytic approach. Eligible studies about this correlation were identified by searching the PubMed, EMBASE, and CNKI databases. Of the 13 identified, 7 (with 1488 cases and 1234 controls) involved the 148C/T polymorphism and 9 (with 1023 cases and 1081 controls) involved the 455G/A polymorphism. No publication bias was detectable and heterogeneity testing found significant differences between the ORs for both groups of studies. The combined OR for the 7 studies on susceptibility to coronary artery disease in 148T allele carriers compared to the 148C/C wild-type homozygotes was 1.31 (95%CI: 0.94–1.84, P=0.11). The combined OR for the 9 studies on susceptibility to coronary artery disease in 455A allele carriers compared to the 455G/G wild-type homozygotes was 1.75 (95%CI: 1.24–2.46, P=0.001). Our results suggest the absence of an association between the β-fibrinogen gene 148C/T polymorphism and susceptibility to coronary artery disease and the possibility that 455G/A polymorphism (in particular, allele A) increases susceptibility to this disease in the Chinese population.
Risk Migration In Supply Chain Inventory Financing Service  [PDF]
Zheng Qin, Xiaochao Ding
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.42026
Abstract: Inventory financing affects the risks of both for banks and supply chain companies. Traditionally, supply chain research focus more on material flow than financial. We construct a supply chain financing risk-information migration model (RMM). In this model, we discussed the preconditions to adopt inventory financing when the enterprises are facing cash constraints. And we simulated the whole operate of supply chain and bank behavior with Matlab. The simulation result shows if loan conditions are satisfied, the total risk value is reduced. Risk migration happens in the financing process. In this process, information-risk proportions are more reasonable.
Association of β-fibrinogen gene -148C/T and -455G/A polymorphisms and coronary artery disease in Chinese population: A Meta analysis

CHEN XiaoChao,XU MingTong,JIN LiZi,CHEN Jian &,CHEN WeiQing,

中国科学C辑(英文版) , 2008,
Abstract: The purpose of our study was to evaluate the correlation between the beta-fibrinogen gene -148C/T and -455G/A polymorphisms and susceptibility to coronary artery disease in the Chinese population using a meta-analytic approach. Eligible studies about this correlation were identified by searching the PubMed, EMBASE, and CNKI databases. Of the 13 identified, 7 (with 1488 cases and 1234 controls) involved the -148C/T polymorphism and 9 (with 1023 cases and 1081 controls) involved the -455G/A polymorphism. No publication bias was detectable and heterogeneity testing found significant differences between the ORs for both groups of studies. The combined OR for the 7 studies on susceptibility to coronary artery disease in -148T allele carriers compared to the -148C/C wild-type homozygotes was 1.31 (95%CI: 0.94-1.84, P=0.11). The combined OR for the 9 studies on susceptibility to coronary artery disease in -455A allele carriers compared to the -455G/G wild-type homozygotes was 1.75 (95%CI: 1.24-2.46, P=0.001). Our results suggest the absence of an association between the beta-fibrinogen gene -148C/T polymorphism and susceptibility to coronary artery disease and the possibility that -455G/A polymorphism (in particular, allele A) increases susceptibility to this disease in the Chinese population.
A Bitcoin system with no mining and no history transactions: Build a compact Bitcoin system
Qian Xiaochao
Computer Science , 2014,
Abstract: There are some alternative Cryptocurrency systems which claim that they are based on PoS are actually based on PoSTW which denotes the Proof of Stake(coin), Time(day) and Work(hashing), while the other pure PoS Cryptocurrency systems are actually centralized. In this paper we propose a new framework of Cryptocurrency system. The major parts what we have changed include, a fast transparent distribution solution which can avoid deceptions between the sponsor and the audience, removing the bloated history transactions from data synchronization, no mining, no blockchain, it's environmentally friendly, no checkpoint, no exchange hub needed, it's truly decentralized and purely based on proof of stake. The logic is very simple and intuitive, 51% of stakes talk. The highlight of this paper is a proposal of a new concise data synchronization mechanism named "Converged Consensus" which ensures the system reaches a consistent distributed consensus. We think the famous blockchain mechanism based on PoW is no longer an essential element of a Cryptocurrency system. In aspect of security, we propose TILP & SSS strategies to secure our system. At the end, we try to give an explicit definition of decentralization.
Study on Photon Transport Problem Based on the Platform of Molecular Optical Simulation Environment
Kuan Peng,Xinbo Gao,Jimin Liang,Xiaochao Qu,Nunu Ren,Xueli Chen,Bin Ma,Jie Tian
International Journal of Biomedical Imaging , 2010, DOI: 10.1155/2010/913434
Abstract: As an important molecular imaging modality, optical imaging has attracted increasing attention in the recent years. Since the physical experiment is usually complicated and expensive, research methods based on simulation platforms have obtained extensive attention. We developed a simulation platform named Molecular Optical Simulation Environment (MOSE) to simulate photon transport in both biological tissues and free space for optical imaging based on noncontact measurement. In this platform, Monte Carlo (MC) method and the hybrid radiosity-radiance theorem are used to simulate photon transport in biological tissues and free space, respectively, so both contact and noncontact measurement modes of optical imaging can be simulated properly. In addition, a parallelization strategy for MC method is employed to improve the computational efficiency. In this paper, we study the photon transport problems in both biological tissues and free space using MOSE. The results are compared with Tracepro, simplified spherical harmonics method (), and physical measurement to verify the performance of our study method on both accuracy and efficiency.
Molecular Optical Simulation Environment (MOSE): A Platform for the Simulation of Light Propagation in Turbid Media
Shenghan Ren, Xueli Chen, Hailong Wang, Xiaochao Qu, Ge Wang, Jimin Liang, Jie Tian
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061304
Abstract: The study of light propagation in turbid media has attracted extensive attention in the field of biomedical optical molecular imaging. In this paper, we present a software platform for the simulation of light propagation in turbid media named the “Molecular Optical Simulation Environment (MOSE)”. Based on the gold standard of the Monte Carlo method, MOSE simulates light propagation both in tissues with complicated structures and through free-space. In particular, MOSE synthesizes realistic data for bioluminescence tomography (BLT), fluorescence molecular tomography (FMT), and diffuse optical tomography (DOT). The user-friendly interface and powerful visualization tools facilitate data analysis and system evaluation. As a major measure for resource sharing and reproducible research, MOSE aims to provide freeware for research and educational institutions, which can be downloaded at http://www.mosetm.net.
Qualitative Simulation of Photon Transport in Free Space Based on Monte Carlo Method and Its Parallel Implementation
Xueli Chen,Xinbo Gao,Xiaochao Qu,Duofang Chen,Bin Ma,Lin Wang,Kuan Peng,Jimin Liang,Jie Tian
International Journal of Biomedical Imaging , 2010, DOI: 10.1155/2010/650298
Abstract: During the past decade, Monte Carlo method has obtained wide applications in optical imaging to simulate photon transport process inside tissues. However, this method has not been effectively extended to the simulation of free-space photon transport at present. In this paper, a uniform framework for noncontact optical imaging is proposed based on Monte Carlo method, which consists of the simulation of photon transport both in tissues and in free space. Specifically, the simplification theory of lens system is utilized to model the camera lens equipped in the optical imaging system, and Monte Carlo method is employed to describe the energy transformation from the tissue surface to the CCD camera. Also, the focusing effect of camera lens is considered to establish the relationship of corresponding points between tissue surface and CCD camera. Furthermore, a parallel version of the framework is realized, making the simulation much more convenient and effective. The feasibility of the uniform framework and the effectiveness of the parallel version are demonstrated with a cylindrical phantom based on real experimental results.
Simulation study on effects of building on diffusion of air pollutants from high elevation point sources
建筑物对高架点源大气污染物扩散影响的模拟研究

Chen Yisheng,Pang Yunji,Li Chen,Cui Xiaochao,
陈义胜
,庞赟佶,李琛,崔小超

环境工程学报 , 2010,
Abstract: Diffusion law of air pollutants emitted from high chimney emission sources was simulated by using numerical methods,three-dimensional mathematical model was built in research area.particle trajectory model that lagrangian method described coupled to wind field.In this paper atmospheric flow field was calculated when the surface wind speed was 3 m/s,under the condition of this wind flow,gaseous pollutant diffusion and motion trajectory of particle pollutants were studied.Through analyzing the results of simu...
Breeding of a high-performance pyrene-degrading strain and its biodegradation performance
一株芘的高效降解菌的选育及其降解性能研究

Tang Yubin,Ma Shanshan,Wang Xiaochao,Chen Fangyan,
唐玉斌
,马姗姗,王晓朝,陈芳艳

环境工程学报 , 2011,
Abstract: 旨在为多环芳烃污染环境的生物修复提供微生物资源和科学依据,从某焦化厂曝气池的活性污泥中分离纯化出一株降解芘的优势菌株B-1,该菌株可在以芘为惟一碳源的培养基中生长繁殖,能利用芘的最高浓度为130 mg/L左右。经形态学观察、生理生化实验及l6S rDNA序列分析,初步判断菌株B-1为芽胞杆菌属。投菌量、芘初始浓度、pH和盐度是影响芘降解效率的因素。在投菌量为15%(V/V)、芘初始浓度为20~100 mg/L和温度为30℃的条件下,该菌在pH为4~11、盐度在1%以内可保持对芘良好的降解能力。当芘初始浓度为80 mg/L,投菌量为13%(V/V),历时10 d,芘的降解效率可达92.4%。
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