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Mechanical analysis of phase transition experiments of the bacterial flagellar filament

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Acta Mechanica Sinica 2010年第5期26卷 777-785页

作者： Xiao-Ling Wang qing-ping Sun Department of Mechanical Engineering University of Scienceand Technology Beijing 100083 Beijing China Department of Mechanical Engineering The Hong KongUniversity of Science and Technology Hong Kong China

Bacterial flagellar filaments can undergo a polymorphic phase transition in both vitro and vivo environments. Each bacterial flagellar filament has 12 different helical forms which are macroscopically represented by different pitch lengths and helix radii. For external mechanical force induced filament phase transitions, there is so far only one experiment performed by Hotani in 1982, who showed a very beautiful cyclic phase transition phenomenon in his experiment on isolated flagellar filaments. In the present paper, we give a detailed mechanical analysis on Hotani＇s experiments. Through theoretical computations, we obtained a phase transition rule based on the phase transition mechanism. The theoretical analysis provides a foundation facilitating the establishment of phase transition theory for bacterial flagellar filaments.

关键词： The polymorphic phase transition Bacterial flagellar filament. Pitch lengths The cyclic phase transition

Geometry of Rectangular Block Triangular Matrices

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Acta Mathematica Sinica,English Series 2009年第12期25卷 2035-2054页

作者： Li ping HUANG Su Wen zou School of Mathematics and Computing Science Changsha University of Science and Technology Changsha 410076 P. R. China Liuzhou Senior High School Liuzhou 545006 P. R. China

Let D be any division ring, and let T（mi,ni,k） be the set of k × k （k ≥ 2） rectangular block triangular matrices over D. For A, B ∈ T（mi,ni,k）, if rank（A - B） = 1, then A and B are said to be adjacent and denoted by A -B. A map T ： T（mi,ni,k） -〉 T（mi,ni,k） is said to be an adjacency preserving map in both directions if A - B if and only if φ（A） φ（B）. Let G be the transformation group of all adjacency preserving bijections in both directions on T（mi,ni,k）. When m1,nk ≥ 2, we characterize the algebraic structure of G, and obtain the fundamental theorem of rectangular block triangular matrices over D.

关键词： geometry of matrices triangular matrix adjacency preserving maximal set

A CASE STUDY FOR ADVANCED PLANNING AND SCHEDULING (APS)

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Journal of Systems Science and Systems Engineering 2011年第4期20卷 460-474页

作者： Kejia CHEN ping Jl qing WANG School of Management Fuzhou University Fuzhou 350108 China Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong Department of Systems Engineering Northeastern University Shenyang 110819 China

This paper presents a case study for the advanced planning and scheduling （APS） problem encountered in a light source manufacturer. The APS problem explicitly considers due dates of products, operation sequences among items, and capacity constraints of the manufacturing system. The objective of the problem is to seek the minimum cost of both production idle time and tardiness or earliness penalty of an order. An intelligent heuristic is applied to the problem, and the results demonstrate that significant production performances can be achieved while ensuring customer satisfaction as opposed to normal oractices followed in the company relying on human expertise.

关键词： Advanced planning and scheduling case study intelligent heuristic

Multi-agent cooperative intrusion response in mobile adhoc networks

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Journal of Systems Engineering and Electronics 2007年第4期18卷 785-794页

作者： Yi ping zou Futai Jiang Xinghao Li Jianhua School of Information Security Engineering Shanghai Jiao tong Univ. Shanghai 200030 P. R. China State Key Lab. of Information Security Graduate School of Chinese Academy of Sciences Beijing 100049 P. R. China

The nature of adhoc networks makes them vulnerable to security attacks. Many security technologies such as intrusion prevention and intrusion detection are passive in response to intrusions in that their countermea- sures are only to protect the networks, and there is no automated network-wide counteraction against detected intrusions, the architecture of cooperation intrusion response based multi-agent is propose. The architecture is composed of mobile agents. Monitor agent resides on every node and monitors its neighbor nodes. Decision agent collects information from monitor nodes and detects an intrusion by security policies. When an intruder is found in the architecture, the block agents will get to the neighbor nodes of the intruder and form the mobile firewall to isolate the intruder. In the end, we evaluate it by simulation.

关键词： computer networks security mobile agent mobile adhoc networks intrusion detection intrusion response

Synthesis of Two Blue-light emitting Complexes with Schiff Base Calixarene as the Ligand

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Chinese Chemical Letters 2003年第3期14卷 263-266页

作者： Xiao Qiang WEI ping zou 等 DepartmentofChemistry SichuanUniversityChengdu610064 AnalyticalandTestingCenter SichuanUniversityChengdu610064

Two new blue luminescent zinc and beryllium complexes with Schiff base calixarene derivative as the ligand were prepared. Their luminescent properties were determined, which indicated that they had strong blue fluorescent properties. They also had good solubility and film formation. These new complexes can be used as blue organic electroluminescent materials (OELMs) in organic electroluminescent devices.

关键词： Synthesis calixarene Schiff base fluorescence organic electroluminescent material.

Solitary Solution of Discrete mKdV Equation by Homotopy Analysis Method

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Communications in Theoretical Physics 2008年第6期49卷 1373-1378页

作者： WANG Zhen zou Li ZHANG Hong-qing Department of Applied Mathematics~ Dalian University of Technology Dalian 116085 China School of Naval Architecture and Ocean Engineering Dalian University of Technology Dalian 116085 China

In this paper, we apply homotopy analysis method to solve discrete mKdV equation and successfully obtain the bell-shaped solitary solution to mKdV equation. Comparison between our solution and the exact solution shows that homotopy analysis method is effective and validity in solving hybrid nonlinear problems, including solitary solution of difference-differential equation.

关键词： differential-difference equation Homotopy analysis method homotopy-Pade approximation discrete mKdV equation soliton

Controllable Persistent Atom Current of Bose-Einstein Condensates in an Optical Lattice Ring

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Communications in Theoretical Physics 2005年第5期43卷 819-822页

作者： ZHENGGong-ping LIANGJiu-qing InstituteofTheoreticalPhysicsandDepartmentofPhysics ShanxiUniversityTaiyuan030006China

In this paper the macroscopic quantum state of Bose-Einstein condensates in optical lattices is studied by solving the periodic Gross-Pitaevskii equation in one-dimensional geometry. It is shown that an exact solution seen to be a travelling wave of excited macroscopic quantum states resultes in a persistent atom current, which can be controlled by adjusting of the barrier height of the optical periodic potential. A critical condition to generate the travelling wave is demonstrated and we moreover propose a practical experiment to realize the persistent atom current in a toroidal atom waveguide.

关键词： Bose-Einstein condensate persistent atom current

SUPERCAVITY MOTION WITH INERTIAL FORCE IN THE VERTICAL PLANE

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Journal of Hydrodynamics 2012年第5期24卷 752-759页

作者： YU Kai-ping zou Wang ARNDT Roger ZHANG Guang School of Astronautics Harbin Institute of TechnologyHarbin 150001China Saint Anthony Falls Laboratory University of MinnesotaMinneapolisUSA

The curvilinear motion in a vertical plane is one of the most important features of the supercavitating vehicle. It is of great significance to study the controllability and the maneuverability of the supercavitating vehicle. Models are built for the effects of the angle of attack, the gravity and the inertial force in the curvilinear motion in the vertical p｜ane. Numerica~ simulations are carried out for the supercavity motion based on these models combined with the Logvinovich model. It is shown that the maximum deviation displacement in the outward normal direction of the trajectory with a constant curvature, which occurs in the tail of the supercavity, increases as the cavitation number or the curvature radius of the supercavity trajectory decreases under the condition that other model and flow parameters are kept constant. For a varied curvature, the supercavity shape changes evidently because of the change of the ambient pressure, but with the same trend as in constant curvature. The deviation displacement increases along the supercavity length gradually.

关键词： supercavity inertial force curvilinear motion curvature radius

Parallel programming characteristics of a DSP-based parallel system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第10期7卷 1669-1675页

作者： GAO Shu GUO qing-ping School of Computer Science Wuhan University of Technology Wuhan 430063 China

This paper firstly introduces the structure and working principle of DSP-based parallel system, parallel accelerating board and SHARC DSP chip. Then it pays attention to investigating the system’s programming characteristics, especially the mode of communication, discussing how to design parallel algorithms and presenting a domain-decomposition-based complete multi-grid parallel algorithm with virtual boundary forecast (VBF) to solve a lot of large-scale and complicated heat problems. In the end, Mandelbrot Set and a non-linear heat transfer equation of ceramic/metal composite material are taken as examples to illustrate the implementation of the proposed algorithm. The results showed that the solutions are highly efficient and have linear speedup.

关键词： Parallel algorithm Multi-grid Domain decomposition Virtual boundary forecast (VBF) DSP-based parallel system