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Ab Initio Calculation of Vacancies and Interstitials in NiSi2

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Chinese Physics Letters 2004年第11期21卷 2163-2166页

作者：汪涛戴永兵欧阳斯可吴建生 ResearchInstituteofMicro/NanoScience&Technology ShanghaiJiaoTongUniversityShanghai200030 SchoolofMaterialsScienceandEngineering Shanghai3iaoTongUniversityShanghai200030

An ab initio plane-wave ultrasoft pseudopotential method based on the generalized gradient approximations has been utilized to investigate the electronic structure, atomic geometry, formation energy to provide a better understanding of properties of Ni disilicide. The vacancy and interstitial formation energies largely depend on the atomic chemical potentials. The formation energies of vacancies VSi and VNi are in the range of 0.04–0.56eV and 1.25–2.3eV, respectively and the formation energies of Si and Ni interstitials are 3.89–4.42eV and 0.67–1.71eV, respectively. The smaller Ni interstitial formation energy is in agreement with the experimental result that Ni interstitial atom is dominant diffusion species in NiSi2.

关键词： Vacancies

Generalized synchronization of hyperchaos and chaos using active backstepping design

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Chinese Physics B 2005年第1期14卷 86-94页

作者：张浩马西奎杨宇徐翠东 SchoolofElectricalEngineering Xi'an3iaotongUniversityXi'an710049China SchoolofElectricalEngineering Xi'an3iaotongUniversityXi'an710049China//KeyLaboratoryofHighVoltageEngineeringandElectricalNewTechnologyundertheStateMinistryofEducationChongqingUniversityChongqing400044China SchoolofElectricalEngineering Xi'an3iaotongUniversityXi'an710049China

A novel active backstepping control method is presented for synchronizing two identical Rossler hyperchaotic systems with each other, and extended to achieve the generalized synchronization of the Chua chaotic system with the Rossler hyperchaotic system. It is a systematic design approach and consists of a recursive procedure interlacing the choice of a Lyapunov function with the design of active control. In particular, this technique gives flexibility in constructing a control law. Numerical experiments verify the feasibility and effectiveness of the proposed control technique.

关键词： generalized synchronization hyperchaos chaos active backstepping design

DRMR： Dynamic-Ring-Based Multicast Routing Protocol for Ad Hoc Networks

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Journal of Computer Science & Technology 2004年第6期19卷 909-919页

作者： YuanZhou Guang-ShengLi Yong-ZhaoZhan Qi-RongMao Yi-BinHou SchoolofComputerandCommunicationEngineering JiangsuUniversityZhenjiang212013P.R.China SchoolofComputerSoftware BeijingUniversityofTechnologyBeijing100083P.R.China iaotonguniversity Xi＇an710071P.R.China

Recently a number of multicast routing protocols for ad hoc networks have been proposed, however, most of them do not provide proper tradeoffs between effectiveness, efficiency and scalability. In this paper, a novel multicast routing protocol is presented for ad hoc networks. The protocol, termed as dynamic-ring-based multicast routing protocol (DRMR), uses the concept of dynamic ring whose radius can be adjusted dynamically and DRMR configures this type of ring for all group member nodes. According to the principle of zone routing, two nodes whose rings overlap can create route to each other, thus, when the ring graph composed of all rings is connected, each member node has one or more routes to others. DRMR uses the method of expanding ring search (ERS) to maintain the connected ring graph, and also can decrease the radius of the ring to reduce the overhead. The performances of DRMR were simulated and evaluated with NS2, and results show that DRMR has a high data packet delivery ratio, low control overhead and good scalability.

关键词： ad hoc wireless network multicast routing protocol dynamic ring

Functional Variable Separation for Generalized （1＋2）-Dimensional Nonlinear Diffusion Equations

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Chinese Physics Letters 2005年第5期22卷 1029-1032页

作者：张顺利楼森岳屈长征 CenterofNonlinearScienceandDepartmentofPhysics NingboUniversityNingbo315211//DepartmentofPhysicsShanghai3iaoTongUniversityShanghai200030 DepartmentofMathematics NorthwestUniversityXi'an710069 CenterofNonlinearScienceandDepartmentofPhysics NingboUniversityNingbo315211//DepartmentofMathematicsNorthwestUniversityXi'an710069