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Search Results: 1 - 10 of 110689 matches for " CHEN Shi-zhong "
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Rotationally symmetric harmonic diffeomorphisms between surfaces
Li Chen,Shi-Zhong Du,Xu-Qian Fan
Mathematics , 2013,
Abstract: In this paper, we show that the nonexistence of rotationally symmetric harmonic diffeomorphism between the unit disk without the origin and a punctured disc with hyperbolic metric on the target.
Parameterized Complexity of Probabilistic Inference in Ising Graphical Model

CHEN Ya-rui,LIAO Shi-zhong,

计算机科学 , 2010,
Abstract: Probabilistic inference of the Ising graphical model is to compute the partition function and the marginal probabilistic distribution through summing variables. Traditional computational complexity theory shows that the exact probabilistic inference of the Ising graphical model is#P-hard, and the approximate probabilistic inference is NP-hard.We analyzed the parameterized complexities of exact probabilistic inference of the Ising graphical model and the Ising mean field approximate inference. First, we proved the parameterized complexity theorems of probabilistic inference of the Ising graphical model with different parameters, which show that parameterized probabilistic inferences arc fixed parameter tractable with the variable number and the graphical model treewidth as parameters respectively. Then, we proved the parameterized complexity theorems of the Ising mean field, which demonstrate that the parameterized Ising mean field is fixed parameter tractable with the combination of the free distribution treewidth, the number of iteration steps and the number of variables as parameter; furthermore, when the Ising graphical model parameters satisfy the contraction condition of the Ising mean field iteration formula, the parameterized Ising mean field is fixed parameter tractable with the combination of the free distribution treewidth and the number of iteration steps as parameter.
-closedness in -fuzzy topological spaces
Bai Shi-Zhong
International Journal of Mathematics and Mathematical Sciences , 2002, DOI: 10.1155/s0161171202202288
Abstract: We introduce and study SP-closedness in L-fuzzy topological spaces, where L is a fuzzy lattice. SP-closedness is defined for arbitrary L-fuzzy subsets.
A Simpler Method for the Efficient and Precise Deletion of Genes in Salmonella sp.
Shi-Zhong Geng,Xin-An Jiao,Zhi-Ming Pan,Qiang Fang,Zhi-Fa Wen,Xiang Chen
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.2090.2094
Abstract: A simpler method for the efficient and precise deletion of genes in Salmonella sp. was developed. To demonstrate this approach, the prgH gene of Salmonella typhimurium SL7207 was deleted by homologous recombination with a temperature-sensitive plasmid containing a cassette that two DNA fragments as homologous arms flanking chloramphenicol resistance gene (CmR) which replaced the prgH gene. During screening mutant at 44°C, the temperature-sensitive plasmid was lost easily only the mutant which prgH gene was replaced by CmR gene could grow in the LB media with chloramphenicol. The results showed that the method was simpler, more effective to delete target gene in genomic DNA of Salmonell sp. than those conventional methods.
Comparison of performance for Raman-amplified optical-fiber transmission systems

Ma Yong-Hong,Xie Shi-Zhong,Chen Ming-Hua,

物理学报 , 2005,
Abstract: A simple method is provided for the performance comparison of the Raman-amplifie d optical-fiber transmission systems. The results show that, compared with conve ntional hybrid-Raman-amplification systems, the maximum transmission distance ca n be increased by about 10% and 30% separately, and the input signal power can b e decreased by about 6 dB for bidirectional-pumping all-Raman-amplification syst ems based on uniform or dispersion-managed transmission fibers.
Numerical Simulation of Output Performance?in PEMFC

,CHEN Shi-zhong, WU Yu-hou

- , 2018, DOI: 10.13208/j.electrochem.170505
Abstract: 摘要 运用COMSOL软件模拟分析3种流道下的质子交换膜燃料电池输出性能. 在相同的操作条件下,比较了单蛇形流道、交指流道以及混合流道之间的性能差异,详细说明了3种流道下质子交换膜燃料电池输出性能差异的原因. 由模拟结果分析得出,混合流道输出性能最好,交指流道输出性能其次,单蛇形流道输出性能最差;混合流道的排水能力最好,氧气浓度分布的最均匀;混合流道阴极进出口氧气浓度差最小. 模拟结果对质子交换膜燃料电池结构的优化和设计具有重要的指导意义
Antitumor activity and immune activity of polysaccharides sargassum

LIANG Shi-zhong,LI Xing-fang,CHEN Jing,WANG Shi-chang,

海洋科学 , 2009,
Abstract: This paper deals with the systemic effects of polysaccharides Sargassum(SP) on NIH mice with H22 tumor.The antitumor effort and immune function of SP were evaluated.H22 tumor bearing mice entity model was established,was treated by gavage with different does of SP and the inhibition rates,thymus and spleen index T lymphocytes and WBC were measured,the vivo deffects on the antitumor were studied.H22 tumor bearing ascites mice model was established and the average survival time was measured. The SP have an ev...
Design of micro-strip open loop diplexers

CAO Hai-lin,CHEN Shi-yong,YANG Shi-zhong,

重庆邮电大学学报(自然科学版) , 2006,
Abstract: 介绍了一种高隔离度微带双工器的设计方法,该双工器由2个在通带附近具有一对传输零点的微带带通 滤波器组成,分析了具有传输零点带通滤波器的设计方法,给出了中心频率为1.85GHz,分数带宽为10.5%和中 心频率为2.15GHz分数带宽为9%的微带开路环带通滤波器设计实例,利用微波cad软件对连接双工器T型 接头的微带尺寸进行了优化,仿真结果表明该双工器具有较好的频带响应及隔离度。
An Improved Method to Knock Out the asd Gene of Salmonella enterica Serovar Pullorum
Shi-Zhong Geng,Xin-An Jiao,Zhi-Ming Pan,Xiao-Juan Chen,Xiao-Ming Zhang,Xiang Chen
Journal of Biomedicine and Biotechnology , 2009, DOI: 10.1155/2009/646380
Abstract: An asd-deleted (Δasd) mutant of Salmonella enterica serovar Pullorum (SP) was constructed using an improved method of gene knockout by combining the -suicide plasmid system with the Red Disruption system. The asd gene was efficiently knocked out by the recombinant suicide vector, which replaced the asd gene with the R gene. Based on the balanced lethal host-vector system, the phenotype of the Δasd mutant was further defined. The improved method was simpler and more effective than previously reported conventional methods.
Attack-resisted Trust Model Based on Vague Set in P2P Networks Environments

CHEN Xu-ri XU Wei-min SHEN Wen-feng YUAN Shi-zhong,

计算机科学 , 2008,
Abstract: Since trust protocols in P2P networks are subject to spite node cheats and attacks,a vague set-based attack-resisted trust model is proposed,which uses degree of membership to measure trust degree of uncertainty information,employs time sensitivity coefficient and punish coefficient to deal with direct feedback information of resource provider,introducs similarity of vague set to evaluate return-information in recommended nodes and present practice schemes and emulational experiments of trust model.And the ...
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