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Two-stop-two-slip motions of a dry friction oscillator

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Science china(Technological Sciences) 2010年第3期53卷 623-632页

作者： YANG ShaoPu1 & GUO ShuQi2.1 School of Mechanical Engineering,shijiazhuang Railway Institute,shijiazhuang 050043,{2. 2.Department of Engineering Mechanics,shijiazhuang Railway Institute,shijiazhuang 050043,{2. 1. School of Mechanical Engineering Shijiazhuang Railway Institute Shijiazhuang 050043 China2. Department of Engineering Mechanics Shijiazhuang Railway Institute Shijiazhuang 050043 China

This paper presents the investigation on the two-stop-two-slip (TSTS) motions in a dry friction *** is a kind of dissipated *** dry friction oscillator implies complicated stick-slip *** to its nonlinear non-smooth characters,it is difficult to analyze the stick-slip ***,TSTS motion is analyzed in this paper.A closed form solution of the TSTS motions is *** addition,parameter domain for the motion is *** general,there are no explicit solutions to transcendental equation in the closed form ***,explicit solutions are possible for special ***, Poincare map is structured to analyze the stability of the motions.

关键词： dry friction non-smooth dynamics stick-slip motion

About the convergence rates of a class of gene expression programming

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Science china(Information Sciences) 2010年第4期53卷 715-728页

作者： DU Xin1,2. & DING LiXin1 1State Key Laboratory of Software Engineering, Wuhan university, Wuhan 430072. china 2.epartment of Information Engineering,{2., shijiazhuang 05.031, china 1. State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 China2. Department of Information Engineering Shijiazhuang University of Economics Shijiazhuang 050031 China

This paper studies the convergence rates of gene expression programming based on maintaining elitist (ME-GEP) by means of Markov chain and spectrum analysis. We obtain the following results: (1) ME-GEP algorithm converges to the global optimum in probability. (2. The convergence rates of ME-GEP algorithm depend on the revised spectral radius of transition matrix of Markov chain corresponding to the algorithm. (3) The upper bounds of revised spectral radius are estimated, which are determined by the parameters of ME-GEP algorithm. (4) As an application of the theoretical results acquired in the paper, the convergence rates of ME-GEP for the polynomial function modeling problem are also analyzed, which verifies the relations between the convergence rates and the algorithm parameters.

关键词： GEP ME-GEP convergence rates Markov chain revised spectral radius

Quantum secret sharing between m-party and n-party with six states

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Science china(Physics,Mechanics & Astronomy) 2009年第8期52卷 1191-1202页

作者： GAO Ting1,YAN FengLi2.3 & LI YouCheng2.3 1 College of Mathematics and Information Science,Hebei Normal {2.,shijiazhuang 050016,{2. 2.College of Physics and Information Engineering,Hebei Normal {2.,shijiazhuang 050016,{2. 3 Hebei Advanced Thin Films Laboratory,shijiazhuang 050016,{2. College of Mathematics and Information Science Hebei Normal University Shijiazhuang 050016 China College of Physics and Information Engineering Hebei Normal University Shijiazhuang 050016 China Hebei Advanced Thin Films Laboratory Shijiazhuang 050016 China

A quantum secret sharing scheme between an m-party group and an n-party group is proposed using three conjugate bases.A sequence of single photons,each of which is prepared in one of the six states,is used directly to encode classical information in the quantum secret sharing *** this scheme,each of all m members in group 1 chooses randomly his/her own secret key individually and independently,and directly encodes his/her respective secret information on the states of single photons via unitary operations,then the last one sends 1/n of the resulting qubits to each member of group *** measuring their respective qubits,all members in group 2.share the secret information shared by all members in group *** renders impossible a Trojan horse attack with a multi-photon signal,a fake-signal attack with EPR pairs,an attack with single photons,and an attack with invisible *** give the upper bounds on the average success probabilities for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle entangled states.

关键词： quantum secret sharing security EPR pairs

Kinetics Study on the Thermal Decomposition of Europium p-methyl-benzoate Complex with 1,10-penanthroline under Non-isothermal Con-ditions

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Rare Metals 2001年第2期20卷 133-136页

作者： Huifang Yang, Jianjun Zhang, Ruifen Wang (Department of Material, Shjiazhuang Railway College, shijiazhuang 050043, china Experimental Center, Hebei Normal {{2., shijiazhuang 050016, china) shijiazhuang Railway Coll Dept Mat Shijiazhuang 050043 Peoples R China Hebei Normal Univ Expt Ctr Shijiazhuang 050016 Peoples R China

The thermal decomposition reaction of Eu-2.p-MBA)(6)(PHEN)(2. (p-MBA=CH3C6H4COO, methylbenzoate; PHEN=C12.8N2. 1,10-phenanthroline) was studied in a static atmosphere using TG-DTG method. The thermal decomposition process of the complex was determined and its kinetics was investigated. Kinetic parameters were obtained from the analysis of TG-DTG curves by means of the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) method. The most probable mechanism functions of the thermal decomposition reaction for the first stage are: f(alpha) =(1-alpha)(2., g(alpha) = (1-alpha)(-1)-1. The activation energy for the first stage is 2.5.18 kJ/mol, the entropy of activation DeltaS is 2.7.32.J/mol and the Gibbs free energy of activation DeltaG is 12..04 W/mol.

关键词： thermal decomposition non-isothermal kinetics mechanisms Eu(III) complex

Quantum secret sharing between multiparty and multiparty with four states

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Science china(Physics,Mechanics & Astronomy) 2007年第5期50卷 572-580页

作者： YAN FengLi1, GAO Ting2.& LI YouCheng1 1 College of Physics and Information Engineering, Hebei Normal university, {2. 050016,{2. 2.College of Mathematics and Information Science, Hebei Normal university, {2. 050016,{2. 1. College of Physics and Information Engineering Hebei Normal University Shijiazhuang 050016 China 2. College of Mathematics and Information Science Hebei Normal University Shijiazhuang 050016 China

A protocol of quantum secret sharing between multiparty and multiparty with four states was presented. It was shown that this protocol can nullify the Trojan horse attack with a multi-photon signal, the fake-signal attack with Einstein-Podolsky- Rosen pairs, the attack with single photons, and the attack with invisible photons. In addition, the upper bounds of the average success probabilities were given for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle entangled states.

关键词： quantum secret sharing, security, Einstein-Podolsky-Rosen pairs

Influence of MnO_2.on the photocatalytic activity of P-2. TiO_2.in the degradation of methyl orange

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中国科学：化学英文版 2008年第2期51卷 179-185页

作者： LI ShunJun1, MA ZiChuan1,2. WANG Lin1 & LIU JingZe2.1 College of Chemistry and Material Sciences, Hebei Normal {2., shijiazhuang 050016,{2. 2.College of Life Science, Hebei Normal {2., shijiazhuang 050016,{2. College of Chemistry and Material Sciences Hebej Normal UniversityShijiazhuang 050016China College of Life Science Hebei Normal UniversityShijiazhuang 050016China

Influences of α-MnO2. β-MnO2. and δ-MnO2.on the photocatalytic activity of Degussa P-2. TiO2.have been investigated through the photocatalytic degradation of methyl orange. The TiO2.photocatalyst, before and after being contaminated by MnO2. was characterized by UV-visible diffuse reflectance spectroscopy (UV-vis DRS), photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS). The results showed that photocatalytic activity of TiO2.could be inhibited significantly or completely deactivated due to the presence of even a small amount of MnO2.particles. It was found that the poisoning effect varied with the crystal phases of MnO2.and the effect was in the order δ-MnO2.>α-MnO2.>β-MnO2. The poisoning effect was attributed to the formation of heterojunctions between MnO2.and TiO2.particles. The heterojunctions changed the chemical state of Ti4+ and O2.sites in the crystalline phase of TiO2. MnO2.in contact with TiO2.particles also broadens the band-gap of TiO2. which decreases UV absorption of TiO2. It can also create some deep impurity energy levels serving as photoelec-tron-photohole recombination center, which accelerates the electron-hole recombination.

关键词： TiO2 MnO2 deactivation photocatalysis methyl orange

Rock matrix-fractured media model for heterogeneous and fractured coal bed

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中国有色金属学会会刊：英文版 2011年第S3期21卷 621-625页

作者： ZHANG Chun-hui1, YU Guang-ming2. ZHANG Chun1 1. School of Civil Engineering, Hebei university of Science and Technology, {2. 050018,{2. 2. School of Civil Engineering, Qingdao Technological university, Qingdao 2.6033,{2. [a] School of Civil Engineering Hebei University of Science and Technology Shijiazhuang 050018 China [b] School of Civil Engineering Qingdao Technological University Qingdao 266033 China

Coal was considered rock matrix-fractured media composed of rock matrix and fractures, and the rock matrix-fractured media model for heterogeneous and fractured coal bed was presented. In this model the rock matrix is heterogeneous, and the mechanical parameters such as elastic modulus and strength follow Weibull distribution. Fractures in coal bed were generated with the discrete fracture network method, and the properties of fractures were simulated with Desai element. Then the virtual generating system (VGS) of natural heterogeneous and fractured coal bed was developed in Matlab 6.0. The coupled model of gas flow and deformation process based on the rock matrix-fractured media model method and VGS for heterogeneous and fractured coal bed was presented, and the numerical code was developed in Matlab 6.0. The gas flow process in the heterogeneous and fractured coal bed was simulated in a numerical case. The main conclusions are: 1) The natural heterogeneous and fractured coal bed could be simulated by the rock matrix-fractured media model and VGS; 2. The fractures connected with the well have much more effects on gas flow than those non-connected.

关键词： heterogeneity fractures rock matrix-fractured media

ON THE EMPTY CONVEX PARTITION OF A FINITE SET IN THE PLANE

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Chinese Annals of Mathematics,Series B 2002年第4期23卷 487-494页

作者： XU CHANGQING DING RENDepartment of Mathematics, Hebei Normal university, shijiazhuang 050016,{{2.. Department of Mathematics Hebei Normal University Shijiazhuang 050016 China

The authors discuss the partition of a finite set of points in the plane into empty convex polygons, and improve some upper bound and lower bound in the related enumeration problems.

关键词： Partition Disjoint partition Empty partition

Probabilistic teleportation via a non-maximally entangled GHZ state

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Chinese Science Bulletin 2010年第10期55卷 902-906页

作者： YAN FengLi1,2.& YAN Tao1,2.1 College of Physics Science and Information Engineering,Hebei Normal {2.,shijiazhuang 050016,{2. 2.Hebei Advanced Thin Films Laboratory,shijiazhuang 050016,{2. College of Physics Science and Information Engineering Hebei Normal University Shijiazhuang China Hebei Advanced Thin Films Laboratory Shijiazhuang China

We present a scheme for probabilistic teleportation via a non-maximally entangled GHZ *** teleportation will succeed with a calculable *** teleportation process requires the sender to make a generalized Bell state measurement,the cooperator to perform a generalized X basis measurement,and the receiver to perform a collective unitary transformation and to make a measurement on an auxiliary *** success probability of the teleportation is *** also obtain the maximum of the success probability of the teleportation.

关键词：成功概率 GHZ态隐形传送纠缠 Bell态测量量子隐形传态传输过程辅助粒子