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Search Results: 1 - 10 of 468583 matches for " <br>李维 "
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A apparent competition model with predator's preference for prey and its simulation analysis
具捕食偏爱的似然竞争模型及模拟分析

guoxiaohu,<br>郭小虎,,郭建军
生态学报 , 2009,
Abstract: 在集合种群似然竞争模型的基础上引入了捕食者对猎物偏爱性因素,提出了具捕食偏爱的似然竞争模型.应用动力系统方法研究了系统的平衡态,用计算机模拟研究了偏爱度对平衡态的影响、平衡态在偏爱度与斑块破坏共同作用下的变化、偏爱度对系统演化动态以及空间分布的影响.结果表明:(1)适度地平衡捕食者对各猎物的偏爱度,有利于系统物种共存;(2)斑块破坏对捕食系统的影响程度与捕食者对各猎物的偏爱度密切相关;(3)适当的增加捕食者对优势猎物的偏爱能有效的缩短系统达到稳定共存的驰豫时间;(4)猎物的丰富度与捕食者对该猎物的偏爱度负相关,猎物斑块的破碎化程度与捕食者对该猎物的偏爱度正相关;(5)在遭破坏的斑块上,多食者比单食者更有利于生存.该研究结果对生态保护和生物资源的可持续利用有重要的启发和指导意义.
Using cellular automata to study patchy spread in a predator-prey system
利用元胞自动机研究一类捕食食饵模型中的斑块扩散现象

YANG Li,LI Weide,<br>杨立,
生态学报 , 2012,
Abstract: 利用概率元胞自动机模型对空间隐式的、食饵具Allee效应的一类捕食食饵模型进行模拟,发现随着相关参数的变化,种群的空间扩散前沿由连续的扩散波逐渐转变为一种相互隔离的斑块向外扩散,这种斑块扩散现象与以往的扩散模式有所不同。研究结果表明:(1)在斑块扩散的情况下,相关参数的微小变化会导致种群灭绝或者形成连续的扩散波,即斑块扩散发生在种群趋于灭绝和连续扩散之间;(2)当种群的空间扩散方式为斑块扩散时,种群的扩散速度会变慢,与其他扩散方式下的速度有着明显的区别。该研究结果对生物入侵控制和外来物种监测有重要的启发和指导作用。
Automatic Measuring System For Torque Stiffness
抗扭刚度自动测定仪的研究

Luo Ying,Li Weimin,<br>骆英,
实验力学 , 1994,
Abstract: Baed on the theory of Eddy current analogy, an automatic system for measuringtotque stiffness is constructed. The error resulted from internal perts of the System is analyst.Examples are given for some testing.
Unique Existence of Solution to Boundary Value Problem of Li\''{E}Nard Type Equations
Li\''{e}nard 型方程周期边值问题 解的存在唯一性

LI Weiguo,CHEN Jinhai,<br>,陈金海
系统科学与数学 , 2008,
Abstract: In this paper the unique solvability of the periodic solution to the following boundary value problem $$u'(t)+f(u,t)u'(t)+g(u,t)=e(t)$$ with suitable periodic boundary conditions is considered.
Analyses on Statistical Errors Shown in Total Citations of Acta Agronomica Sinica in 2003
《作物学报》2003年被引频次统计误差分析

DU ZhiBo,TANG XianXin,<br>程,爱华
中国科技期刊研究 , 2006,
Abstract: 通过对《中国科技期刊引证报告》和《中国学术期刊综合引证报告》2003年所统计《作物学报》的被引频次分析表明,这两种检索系统对《作物学报》的被引频次统计均存在有不同程度的误差;认为文献检索机构应重视引文统计数据和影响因子、被引频次等引证指标的准确性。
STUDY ON ROCKBURST PREDICTION METHOD BASED ON THE PRIOR KNOWLEDGE
基于先验知识的岩爆预测研究

Yang Tao,Li Guowei,<br>杨涛,
岩石力学与工程学报 , 2000,
Abstract: Based on the neural network theory, a new rockburst prediction model is established. The BP network is trained using the collected data from some actural projects. The study shows that the proposed model is of objectivity, generality and higher accuracy.
APPLICATION OF OPTIMIZATION METHODS IN BACK ANALYSIS OF DEFORMATION MONITORING IN FLASTIC, TRANSVERSALLY ISOTROPIC AND ELASTOPLASTIC SURROUNDING ROCKS
优化方法在弹性、横观各向同性以及弹塑性围岩变形观测反分析中的应用

Li Suhua,<br>素华,
岩石力学与工程学报 , 1993,
Abstract: This paper presents a research on the optimization methods of back analysis for rock mechanics parameters and initial ground stresses in the surrounding rocks of underground works. Four kinds of optimization methods are used, viz., the Simplex Acceleration Method, Complex Acceleration Method, New Powell Method and SUMT Method. An FEM programme, which can be used to solve plane problems by a direct algorithm and can automatically select the proper ones from the above-mentioned four methods, back analysis parameters and loading ways, is compiled. The programme can solve complicated optimization and back analysis problems of elastic, elastoplastic and orthogonally anisotropie surrounding rocks. It can also take tunnel supporting, multistep excavation and anchored jointed rock masses into consideration. Optimal back analyses of elastic, elastoplastic and transversally isotropic problems have been conducted in connection with two practical engineering projects with satisfactory results.
DESIGN OF SIMULATION TRAINING SYSTEM OF EARTHQUAKE PRECURSORY OBSERVATION DEVICES
地震前兆观测设备模拟培训系统设计

Li Jun,Shan Weifeng,<br>,
大地测量与地球动力学 , 2010,
Abstract: It is necessary to create a new precursory observation devices lab to meet the needs of training and teaching,but it is very expensive and there is requirament of high quality to the lab environment.Computer technology can simulate the real devices.According "Stipulation on Net Communication for Devices in China Geophysical and Geochemical Observatory Network",Communication primitives and data package format are introduced.With the object-oriented principles,socket and multithreading technologies,a simulati...
FRACTAL NEURAL NETWORKS FOR SHORT TERM MEMORY
用分维神经网络实现短期记忆

Li Xia,Xie Weixin,<br>,
电子与信息学报 , 1999,
Abstract: 神经网络中的突触连接矩阵储存有限的信息。当神经网络在线使用时,基于Hebb规则的网络模型将不再适用。本文提出用分维神经网络实现短期记忆,要求旧的模式随时间而遗忘,最近存储的模式可以可靠记忆。实验结果表明,该网络模型适用于在线工作,且优于对比方法。
Exploiting Deterministic TPG for Path Delay Testing
Paul YSCheung,LI Xiaowei,Paul YSCheung,<br>
计算机科学技术学报 , 2000,
Abstract: Detection of path delay faults requires two-pattern tests. BIST technique provides a low-cost test solution. This paper proposes an approach to designing a cost-effective deterministic test pattern generator (TPG) for path delay testing. Given a set of pre-generated test-pairs with pre-determined fault coverage, a deterministic TPG is synthesized to apply the given test-pair set in a limited test time. To achieve this objective, configurable linear feedback shift register (LFSR) structures are used. Techniques are developed to synthesize such a TPG, which is used to generate an unordered deterministic test-pair set. The resulting TPG is very efficient in terms of hardware size and speed performance. Simulation of academic benchmark circuits has given good results when compared to alternative solutions.
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