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Search Results: 1 - 10 of 116290 matches for " LIU Mei-Feng "
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Stability Analysis and Investigation of a Magnetoelastic Beam Subjected to Axial Compressive Load and Transverse Magnetic Field
Mei-Feng Liu,Tai-Ping Chang
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/385742
Abstract: The interactive behaviors between transverse magnetic fields and axial loads of a magnetoelastic (ME) beam subjected to general boundary conditions are investigated. In particular, the instability criterion for the magneto-mechanical buckling problem is intricately discussed based on the structure characteristics and the initial conditions. The equation of motion for the proposed physical model is introduced according to the Hamilton's principle, and the stability criterion is obtained by using the method of multiple scales implemented on both spatial and time domains. Eventually a so-called Schrodinger equation with cubic nonlinearity (NLS) can be generated by suitably changing the variables; as a result, the stable criterion for the magnetoelastic beam can be acquired after dissecting the nonlinear Schrodinger equation and requiring the imaginary part of the time domain solution to be vanished. Stability criterion curve for the dispersion equation of the ME beam is firstly depicted in order to reveal the magnificent influence of the structure characteristic itself, followed by the instability constraint due to the variation of initial conditions and the observation locations. The results indicate that the prior one actually denotes a parabola, whereas the latter one is sometimes a diamond-like or ellipse-like region spotting along the prior one.
catena-Poly[di-μ1,1-azido-(1,10-phenanthroline)cadmium(II)]
Feng Chen,Fa-Kun Zheng,Guang-Ning Liu,Mei-Feng Wu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810019318
Abstract: The asymmetric unit of the title CdII compound, [Cd(N3)2(C12H8N2)]n, contains a CdII atom, located on a twofold axis passing through the middle of the phenanthroline molecule, one azide ion and half of a 1,10-phenanthroline molecule. The CdII atom exhibits a distorted octahedral coordination including one chelating 1,10-phenanthroline ligand and four azide ligands. The crystal structure features chains along the c direction in which azide groups doubly bridge two adjacent CdII atoms in an end-on (EO) mode. Interchain π–π stacking interactions, with centroid–centroid separations of 3.408 (2) between the central aromatic rings of 1,10-phenanthroline molecules, lead to a supramolecular sheet parallel to the bc plane.
Moving object detection based on consecutive blocks frame difference and background subtraction
分块帧差和背景差相融合的运动目标检测

GAO Mei-feng,LIU Di,
高美凤
,刘 娣

计算机应用研究 , 2013,
Abstract: This paper proposed a novel approach for moving detection, which employed blocks frame difference and background subtraction. It used block processing method to establish the initial background model and it divided the sequence ima-ge of video into several blocks which was detected by self-adaptive threshold inter-frame difference, and separeted roughly the motion region. Then it carried on fine-grained segmentation through double-threshold background subtracting for the motion region, and used the adaptive background updating to overcome the light changing and background interference. Experimental results indicate that the method has the characteristics of fast operation and great robustness, and it can detect the moving object effectively.
DYNAMIC MONITORING ON DEVELOPING PROCESS OF ROCK CRACKS
岩石裂纹扩展过程的动态监测研究

LIU Dong-mei,CAI Mei-feng,ZHOU Yu-bin,CHEN Zhi-yong,
刘冬梅
,蔡美峰,周玉斌,陈志勇

岩石力学与工程学报 , 2006,
Abstract: 利用实时全息干涉法、高分辨率数字摄像机与计算机图像处理系统相链接的三位一体化测量系统,连续动态观测了单轴受压砂岩、花岗岩和压剪受荷砂岩试样裂纹扩展与变形破坏过程;基于动态干涉条纹的定量分析,描述了岩石微裂纹孕育起裂、扩展与闭合的动态交替演化过程,计算了岩石裂纹扩展速度与蠕变扩展速率和裂纹面的扩展变形量与蠕变变形量,实现了岩石内部Ⅰ型、Ⅰ—Ⅱ复合型、Ⅰ-Ⅱ-Ⅲ复合型裂纹力学性状动态演变的有效判识。
Design and implementation of smart card key management system based on threshold scheme
基于门限方案的智能卡密钥管理系统的设计与实现

SHI Feng,DAI Guan-zhong,LIU Hang,MIAO Sheng,LI Mei-feng,
石峰
,戴冠中,刘航,苗胜,李美峰

计算机应用 , 2006,
Abstract: In modern cryptography, the security of cryptography depends on the security of the cryptographic key. In order to ensure the security of eryptographie products, a smart card key management system based on threshold scheme was proposed and implemented in this paper. By introducing the threshold eryptosystem and the mutual dynamic authentication mechanisms based on smart card, the security problems of key generation, storage, distribution, and the security of the application process were solved effectively.
Damaging effect of pressurized CO2 on cell membrane of Escherichia coli
加压CO2对大肠杆菌细胞膜的损伤作用

YAO Chun-Yan,LIU Mei-Feng,FU Rui-Dong,LI Xiao-Dong,
姚春艳
,刘美凤,付瑞东,李晓东

微生物学通报 , 2013,
Abstract: Objective] The damage in the cell membrane of bacteria could be reflected on the leakiness of the material in bacteria and the absorption of dye in bacteria. Compared with pasteurization (63 °C, 30 min), the damaging effect of pressurized CO2 on the cell membrane of Escherichia coli was studied. The aim of the study was to analyze the relationship between the death of Escherichia coli and the damage of cell membrane. Methods] The change of cell membrane permeability and the leakiness of protein and nucleic acid in Escherichia coli were detected. The change of Escherichia coli morphology was observed by TEM. Results] The results indicated that pressurized CO2 treatment induced the change of cell membrane permeability of Escherichia coli. Pressurized CO2 treatment induced the leakiness of protein in Escherichia coli, but the time of leakiness was lagged behind the time of 99% Escherichia coli death, so it was not the reason for death, it was only the secondary phenomenon of death. The death of Escherichia coli could be related to the leakiness of nucleic acid induced by the pressurized CO2 treatment. The death of Escherichia coli could be related to the ultrastructure change of Escherichia coli induced by the pressurized CO2 treatment. Conclusion] There was direct relationship between the damaging effect of pressurized CO2 on cell membrane of Escherichia coli and the death of Escherichia coli.
Research on Intellectual Property Core Protection in SoC Design
SoC设计中的IP核保护方法研究

MIAO Sheng,DAI Guan-zhong,LIU Hang,LI Mei-feng,
苗胜
,戴冠中,刘航,李美峰

计算机应用研究 , 2007,
Abstract: This paper surveyed the existing IP core protection methods, and pointed out the advantages and disadvantages of each one. Finally, the potential direction of IP core protection in the future was indicated.
Instruction set extension for accelerating Montgomery multiplication in GF(2m)
加速有限域GF(2m)上Montgomery乘法实现的指令集扩展研究*

LI Mei-feng,DAI Guan-zhong,LIU Hang,HU Wei,
李美峰
,戴冠中,刘航,胡伟

计算机应用研究 , 2009,
Abstract: This paper introduced instruction set extension to accelerate the software implementation of Montgomery multiplication in GF(2m).The performance estimate results show that instruction set extension can rapidly increase the implementation efficiency, especially when polynomials multiplication instruction MULGF2 and polynomials multiply-accumulate instruction MAGF2 are both available, and the larger the word size of processor is, the better the performance is.
Preparation of entangled atomic states through simultaneous nonresonant atom--field interaction
Preparation of entangled simultaneous nonresonant atomic states through atom-field interaction

Chen Mei-Feng,
陈美锋

中国物理 B , 2006,
Abstract: A scheme is proposed for generating a three-atom maximal entanglement W state. It is based on the simultaneous nonresonant interaction of atoms with a single-mode cavity field. Our scheme is insensitive to the cavity field, so the cavity field in our scheme can be initially in thermal states.
資訊融入生物科教學之教材製作與教學策略初探 | An Exploratory Study of Integrating Information and Communication Technology into Biology Instruction in Junior High School: Curriculum and Pedagogy
張梅鳳 Mei-Feng Chang
Journal of Library and Information Science , 2004,
Abstract: 頁次:55-65
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