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Search Results: 1 - 10 of 11761 matches for " Zhiyuan Cao "
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Experimental Investigation of Boundary Layer Characteristics on Blade Surface under Different Inlet Flow Conditions  [PDF]
Xiangfeng Bo, Bo Liu, Pengcheng Zhao, Zhiyuan Cao
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24044
Abstract: In this paper, an experimental study is conducted on cascade boundary layer under different inlet conditions. New method is used to measure the total pressure in blade surface boundary layer directly using total pressure probe. Total pressure in both suction and pressure surfaces are acquired at different inlet conditions by changing incidence angle and inlet Mach number. In addition, a series of parameters related to boundary layer characteristics are calculated. The objective of the experiment is to investigate the influence of inlet flow conditions on them. The results indicate that influence of incidence angle is significant when other conditions are the same. Displacement thickness, momentum thickness as well as other parameters display some disciplines for variation. In contrast, inlet Mach number has only a small influence in that boundary layer becomes a litter thinner with increasing Mach number. Comparisons of experimental results with theoretical expectations demonstrate that the method in this experiment is effective and reliable.
VISCOELASTICITY SOLUTION OF TIME-VARIATION SOLID MECHANICS
时变固体力学的黏弹性解

Cao Zhiyuan,
曹志远

力学学报 , 2000,
Abstract: 基于时变力学的对应性原理,建立一种黏弹性时变力学的一般性解法,适用于一类时变力学问题的求解。
Mechanical analysis of functionally graded plates based on the input data of metallographic diagrams
ZhiYuan Cao,ShouGao Tang,HongMei Cheng
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0039-5
Abstract: A microelement method for scale-span analysis of material microstructure and member macro response has been proposed. Instead of material parameter input for traditional mechanical analysis, the method is based on the input of metallographic diagram information. In order to express the material microstructure, this method arranges concentrated microelements in ordinary finite element before calculation, and transfers the node degrees of freedom of each microelement into the ones of the same finite element via compatibility conditions. This method can realize direct transition analysis from material microstructure to macro responses of members, while computation elements and degrees of freedom are equal to those of ordinary FEM. Based on the complicated microstructure diagrams proposed by material metallographic diagram, the mechanics responses of functionally graded plates are calculated and 3-D distributions of macro-mechanical variables and identical stress lines tendency on microstructure are given.
Mechanical analysis of functionally graded plates based on the input data of metallographic diagrams
CAO ZhiYuan,TANG ShouGao,CHENG HongMei,

科学通报(英文版) , 2008,
Abstract: A microelement method for scale-span analysis of material microstructure and member macro re- sponse has been proposed. Instead of material parameter input for traditional mechanical analysis, the method is based on the input of metallographic diagram information. In order to express the material microstructure, this method arranges concentrated microelements in ordinary finite element before calculation, and transfers the node degrees of freedom of each microelement into the ones of the same finite element via compatibility conditions. This method can realize direct transition analysis from ma- terial microstructure to macro responses of members, while computation elements and degrees of freedom are equal to those of ordinary FEM. Based on the complicated microstructure diagrams pro- posed by material metallographic diagram, the mechanics responses of functionally graded plates are calculated and 3-D distributions of macro-mechanical variables and identical stress lines tendency on microstructure are given.
SINGULAR SOLUTIONS OF AXISYMMETRIC ELASTODYNAMIC PROBLEM FOR MULTILAYERED HALFSPACE
层状弹性半空间轴对称动力问题的奇异解

Zeng Sanping Cao Zhiyuan,
曾三平
,曹志远

力学学报 , 1992,
Abstract: In the paper, the singular solutions of axisymmetric elastodynamic problem for the multilayered halfspace due to unit dynamic load acting within layered media are derived in time domain with the aid of Laplace-Hankel mixed transforms and transfer matrix method. A numerical computation of these solurions is also proposed using a fast Hankel transform algorithm. Two examples show that the solutions can be readily evaluated and the numerical results have considerably high precision. The presented solutions can be directly applied to determine the transient waves caused by seismic sources and show the potential application to problems of elastodynamics solved by boundary integral method.
A Multipath Routing Algorithm Based on Traffic Prediction in Wireless Mesh Networks  [PDF]
Zhiyuan LI, Ruchuan WANG
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12013
Abstract: The technology of QoS routing has become a great challenge in Wireless Mesh Networks (WMNs). There exist a lot of literatures on QoS routing in WMNs, but the current algorithms have some deficiencies, such as high complexity, poor scalability and flexibility. To solve the problems above, a multipath routing algorithm based on traffic prediction (MRATP) is proposed in WMNs. MRATP consists of three modules including an algo-rithm on multipath routing built, a congestion discovery mechanism based on wavelet-neural network and a load balancing algorithm via multipath. Simulation results show that MRATP has some characteristics, such as better scalability, flexibility and robustness. Compared with the current algorithms, MRATP has higher success ratio, lower end to end delay and overhead. So MRATP can guarantee the end to end QoS of WMNs.
Application of Integrated Reorganization of Science Specimen Data Using Kettle  [PDF]
Zhiyuan Wu, Yang Mei
Intelligent Information Management (IIM) , 2019, DOI: 10.4236/iim.2019.111002
Abstract: Standards and specifications are the premise of integrated reorganization of science specimen data, and data integration is the core of the reorganization. ETL [1] which is the abbreviation of extract, transform, and load [2], is very suitable for data integration. Kettle is a kind of ETL software. In this paper, it has been introduced into the integrated reorganization of science specimen data. Multi-source and heterogeneous specimen data are integrated using kettle, and good results have been achieved. It proved the effectiveness of kettle in the integrated reorganization of science specimen data. The application has practical significance, and the method can be referenced when reorganizing other resource data.
FREE VIBRATION OF NONCIRCULAR CYLINDRICALSHELLS WITH ARBITRARY BOUNDARYCONDITIONS
非圆柱壳在各种边界条件下的自由振动分析

Zhu Jianxiong Cao Zhiyuan Li Guohao,
朱建雄
,曹志远,李国豪

力学学报 , 1992,
Abstract: By a new coordinate transbormation function, the cylindrical shell witharbitrary shaped section can be mapped into a circular cylindrical shell and then the free vibration of the circular cylindrical shell is only investigated with the aid of the characteristic beam vibration functions. Detailed results of applications to oval and U-shaped cylindrical shells are presented. The versatility and accuracy of the method are amply demonstrated through a number of worked examples.
Genetic Diversity of Hepatitis A Virus in China: VP3-VP1-2A Genes and Evidence of Quasispecies Distribution in the Isolates
Hao Wang, Huihui Zheng, Jingyuan Cao, Wenting Zhou, Yao Yi, Zhiyuan Jia, Shengli Bi
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074752
Abstract: Hepatitis A virus (HAV) is the most common cause of infectious hepatitis throughout the world, spread largely by the fecal-oral route. To characterize the genetic diversity of the virus circulating in China where HAV in endemic, we selected the outbreak cases with identical sequences in VP1-2A junction region and compiled a panel of 42 isolates. The VP3-VP1-2A regions of the HAV capsid-coding genes were further sequenced and analyzed. The quasispecies distribution was evaluated by cloning the VP3 and VP1-2A genes in three clinical samples. Phylogenetic analysis demonstrated that the same genotyping results could be obtained whether using the complete VP3, VP1, or partial VP1-2A genes for analysis in this study, although some differences did exist. Most isolates clustered in sub-genotype IA, and fewer in sub-genotype IB. No amino acid mutations were found at the published neutralizing epitope sites, however, several unique amino acid substitutions in the VP3 or VP1 region were identified, with two amino acid variants closely located to the immunodominant site. Quasispecies analysis showed the mutation frequencies were in the range of 7.22x10-4 -2.33x10-3 substitutions per nucleotide for VP3, VP1, or VP1-2A. When compared with the consensus sequences, mutated nucleotide sites represented the minority of all the analyzed sequences sites. HAV replicated as a complex distribution of closely genetically related variants referred to as quasispecies, and were under negative selection. The results indicate that diverse HAV strains and quasispecies inside the viral populations are presented in China, with unique amino acid substitutions detected close to the immunodominant site, and that the possibility of antigenic escaping mutants cannot be ruled out and needs to be further analyzed.
Angular dependent NEXAFS study of the molecular orientation of PTCDA multilayers on Au (111) surface
Liang Cao,WenHua Zhang,YuYan Han,TieXin Chen,ZhiYuan Zheng,Li Wan,FaQiang Xu,Kurash Ibrahim,HaiJie Qian,JiaOu Wang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4792-5
Abstract: The molecular orientation of perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTCDA) multilayers adsorbed on Au (111) surface has been investigated using angular dependent O K-edge near edge X-ray absorption fine structure (NEXAFS) spectroscopy. The significant angular dependence of important resonant structures (π* and σ*) reveals that PTCDA molecules adopt an ordered geometry on the substrate surface. The average tilt angle of the PTCDA molecular planes is 27°±10° from the Au (111) surface.
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