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Search Results: 1 - 10 of 78242 matches for " CHEN Zhenghan "
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Theoretical study on the influence of residual stress on adhesion-induced instability in MEMS
ShiJi Wang,Xian Li,ZhengHan Chen
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0379-9
Abstract: Adhesion and residual stress play a critical role in the performance and reliability of MEMS. The influence of residual stress on the adhesion-induced instability in MEMS is examined within the framework of thin elastic plate theory. The results show that the adhesion-induced instability will be mitigated if the residual stress exists in certain component of MEMS. Moreover, we find that the influence is significant only when the residual stress is under a proper magnitude (β 20).
Identifying Topological Order by Entanglement Entropy
Hong-Chen Jiang,Zhenghan Wang,Leon Balents
Physics , 2012, DOI: 10.1038/nphys2465
Abstract: Topological phases are unique states of matter incorporating long-range quantum entanglement, hosting exotic excitations with fractional quantum statistics. We report a practical method to identify topological phases in arbitrary realistic models by accurately calculating the Topological Entanglement Entropy (TEE) using the Density Matrix Renormalization Group (DMRG). We argue that the DMRG algorithm naturally produces a minimally entangled state, from amongst the quasi-degenerate ground states in a topological phase. This proposal both explains the success of this method, and the absence of ground state degeneracy found in prior DMRG sightings of topological phases. We demonstrate the effectiveness of the calculational procedure by obtaining the TEE for several microscopic models, with an accuracy of order $10^{-3}$ when the circumference of the cylinder is around ten times the correlation length. As an example, we definitively show the ground state of the quantum $S=1/2$ antiferromagnet on the kagom\'e lattice is a topological spin liquid, and strongly constrain the full identification of this phase of matter.
Topologization of electron liquids with Chern-Simons theory and quantum computation
Zhenghan Wang
Physics , 2006,
Abstract: We discuss a nexus among quantum topology, quantum physics and quantum computing.
Quantum Computing: a Quantum Group Approach
Zhenghan Wang
Mathematics , 2013,
Abstract: There is compelling theoretical evidence that quantum physics will change the face of information science. Exciting progress has been made during the last two decades towards the building of a large scale quantum computer. A quantum group approach stands out as a promising route to this holy grail, and provides hope that we may have quantum computers in our future.
QUANTITATIVE ANALYSIS ON DAMAGE EVOLUTION OF INTACT EXPANSIVE SOIL DURING TRIAXIAL SHEARING TEST
原状膨胀土剪切损伤演化的定量分析

Lu Zaihua,Chen Zhenghan,Pu Yibin,
卢再华
,陈正汉,蒲毅彬

岩石力学与工程学报 , 2004,
Abstract: Based on the computerized tomography(CT) scanning results of natural expansive soil during triaxial shearing test,a damage variable of natural expansive soil is derived from the computerized tomography scanning data,and the damage evolution equation of expansive soil during shearing is also developed.
EXPERT SYSTEM KNOWLEDGE OF INTELLIGENT CHOICE OF SUPPORTING TYPE FOR DEEP EXCAVATION IN XIAMEN
厦门深基坑支护智能选型专家系统知识

Zhu Yuanqing,Zhou Haiqing,Chen Zhenghan,
朱元青
,周海清,陈正汉

岩石力学与工程学报 , 2004,
Abstract: In light of the characteristics of expert system knowledge of intelligent choice of supporting type for deep excavation in Xiamen,the thoughtway of expert in geotechnical engineering and the reasoning method of corresponding class of expert system knowledge are combined. Through the expression of knowledge,the establishment of knowledge base and database of expert system is discussed.
STUDY ON DEFORMATION AND STRENGTH CHARACTERISTIC OF EXPANSIVE SOIL WITH TRIAXIAL TESTS
南阳膨胀土变形与强度特性的三轴试验研究

Lu Zaihua,Chen Zhenghan,Sun Shuguo,
卢再华
,陈正汉,孙树国

岩石力学与工程学报 , 2002,
Abstract: The triaxial tests of Nanyang unsaturated expansive soil are carried out under four kinds of stress paths, that is isotropic loading tests at various controlled suction, shrinkage tests at various controlled net mean stress, swelling tests at various controlled net mean stress and drained shear tests under controlled cell pressure and suction. Many meaningfull results are obtained. The yield behaviour under isotropic loading of expansive soil can be described by the LC curve, The yield suction of shrinkage test decreases as the net mean stress increasing. The friction angle under unsaturated state is close to that under saturated condition. The total cohesion increases with suction. The water content changes linearly with the net mean stress at isotropic loading test and triaxial shear test. The relationship between water content and suction is also linear under shrinkage test and swelling test.
Critical theory of the topological quantum phase transition in a spin-2 chain
Hong-Chen Jiang,Stephan Rachel,Zheng-Yu Weng,Shou-Cheng Zhang,Zhenghan Wang
Physics , 2010, DOI: 10.1103/PhysRevB.82.220403
Abstract: We systematically study the phase diagram of S=2 spin chain, by means of density-matrix renormalization group and exact diagonalization methods and confirm the presence of a dimer phase in the AKLT--SZH model. We find that the whole phase boundary between the dimer and SZH phases, including the multicritical point, is a critical line with the same central charge $c=5/2$. Finally, we propose and confirm that this line can be described by the $\rm SO(5)_1$ Wess-Zumino-Witten (WZW) conformal field theory.
INFLUENCE OF STRUCTURAL DAMAGE ON YIELDING CHARACTERISTICS OF EXPANSIVE SOILS
结构损伤对膨胀土屈服特性的影响

YAO Zhihua,CHEN Zhenghan,HUANG Xuefeng,MIAO Qiangqiang,
姚志华
,陈正汉,黄雪峰,苗强强

岩石力学与工程学报 , 2010,
Abstract: 利用与CT机配套的非饱和多功能土工三轴仪,对干湿循环不同次数的膨胀土进行控制吸力为常数的各向等压试验,从细观上研究损伤对膨胀土屈服应力的影响。研究表明:屈服应力随着结构损伤的增大而减小;屈服前压缩指数随着结构损伤的增大而增大。根据细观试验数据,分别提出结构参数与屈服应力和宏观变量之间的定量表达式,进而将Barcelona膨胀土模型推广到结构损伤情况。
On Freedman's lattice models for topological phases
James Brink,Zhenghan Wang
Physics , 2003,
Abstract: Freedman proposes a family of Hamiltonians $H_{0,l}$ which define quantum loop gas models on any celluated compact surface. We study the simplest nontrivial cases: celluations of the torus. Our numerical data support Freedman's conjecture, but the conjectured space of ground states does not come out in full.
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