查询词典 dynamic system

DIPSO incorporates the dynamic mutation, multi-subpopulations methods of IPSO, and changes the heights and the positions of the peaks by variable parameters and chaotic model. This algorithm uses multi-subpopulations to search for the highest peak in order to track the dynamic environments. Furthermore, DIPSO apperceives the changes of the environment by tracking the fitness value of the global optimal particle.

该算法是IPSO的动态版本，沿用了IPSO的动态变异策略、多子种群策略，在算法运行的过程中分别对环境进行参数设定型动态变化和混沌模型动态变化，利用多子种群分别对多个峰进行搜索，很好地实现了算法的追踪性能；对全局最优粒子进行实时跟踪，利用其适应度值的变化来发现环境的改变，并以此来引导群体对环境变化的感应。

As a result, the contradiction between human and land is becoming more and more acute. Based on the systematic analysis of the total dynamic balance of cultivated land, this paper applies dynamic method to set up the SD model aims at assuaging land tension; protecting cultivated land and realizing sustainable land use.

本文在耕地总量动态平衡系统分析的基础上，运用系统动力学方法，以温州市为例，建立了耕地总量动态平衡模型，用模型模拟了该地区耕地总量动态平衡的目标，对缓解耕地人口压力、保护耕地和实现区域土地可持续利用进行了探讨。

started with the analysis of characteristic parameter of the successive detection logarithmic amplifier,mainly discusses the main factor affecting its transfer characteristic by mathematics reasoning to its transfer function,studies the correlative relations of the single stair′s plus,the series with the dynamic range and the logarithmic precision by matlab and matrixx simulation.so two pieces of conclusion have been reached:one is on condition that the dynamic range is limited,the more the series that is used and the single stair′s plus is less,the higher the logarithmic precision is.the other is that using the double amplifier chain can enhance the logarithm starting point,so its stability is improved.and the conclusion has been applied to the practical circuit′s analysis of the tacan beaconing receiver.

摘 要：从分析连续检波式对数放大器的特性参数入手，对其传输函数进行了数学推导，重点讨论了影响其传输特性的主要因素，通过matlab和matrixx仿真，研究了输入动态范围与级联级数、单级增益和对数精度的相互关系，得出了两点结论：一是在限定动态范围的前提下采用的级数越多其单级增益越小而精度就会越高，二是采用双放大链结构可以提高对数起点，从而提高其稳定性。最后将结论应用于塔康信标接收机实际电路的分析中。关键词：对数放大器；连续检波；塔康信标；对数精度

A number of search engines these days will catalog dynamic content, but even for those engines which do, a static page is 10 to 100 times more likely to be cataloged than a dynamic page.

一些搜索引擎的这些天，将目录动态内容，但即使是对於那些引擎做的，是静态页面的10至100倍，更容易被归类比一个动态网页。

After analyzing the limitation of current PKI trust model in dynamic business cooperation environment, we point out that the conflict between the existences of a trusted third party and cross-certification based interoperability and a transient, dynamic and distributed cooperation in ASC can not be conciliated.

本文首先给出了公开密钥基础设施的基本概念和技术，分析了现有PKI信任模型在动态商业协作环境下的局限性，指出了对最高信任机构存在的要求以及用交叉认证方式实现互操作性和供应链中短暂、动态的分布式合作关系之间的矛盾是无法调和的。

Three types of base asphalt and six SBS were used to produce SBS modified asphalt. The interaction of SBS modified asphalt was discussed in different states between the base asphalt and SBS based on their compositions. Through the traditional tests, such as penetration, soften point and ductility, and US SHRP tests, the results indicated that influences to affect the temperature susceptibility, high and low temperature performance, aging characteristics are base asphalt, SBS types and their dosages. The functions of penetration to viscosity and complex shear modulus G~* to complex dynamic shear viscosity η~* were set up, and then theviscosity-temperature susceptibility of wide temperature span and the calculation method of low temperature viscosity were obtained."Process" evaluation criterions, high grading critical temperature T_ and low grading criticaltemperature T_ , were suggested according to the high and low temperatureperformances of SBS modified asphalt. Using the experience of Repeated Creep and Recovery Test for Binders, a new high-temperature evaluation index,modification rutting factor G~*~(-9) was obtained. The results after RTFO and PAV aging indicated that traditional tests didnt differentiate base asphalt and SBS modified asphalt, but dynamic mechanics temperature spectrum and G*-5 black chart clearly reflected the influence of aging to the SBS modified asphalt. With the IR and GPC tests, the reason of aging to the SBS modified asphalt were due to asphalt phase oxygenated and SBS phase depredated.

论文选择3种油源的基质沥青和6种SBS改性剂制备改性沥青，通过分析基质沥青和SBS改性剂的组成结构特点，得出了不同状态下SBS改性沥青的SBS与基质沥青的相互作用机理；通过针入度、软化点、延度等常规试验以及美国SHRP试验，分析了基质沥青、SBS改性剂类型与剂量对SBS改性沥青的温度敏感性、高低温特性及老化特性的影响；建立了针入度-粘度、复数模量G~*-复数粘度η~*的换算关系，得出了宽温度域的粘温指数VTS和较低温度下粘度的计算方法；通过高低温性能分析提出了&过程&评价参数高温等级温度T_和低温等级温度T_；借鉴重复恢复与蠕变试验研究成果，得到了SBS改性沥青高温评价指标改进型抗车辙因子G~*~(-9)；RTFO和PAV老化后的性能试验结果表明，常规试验难以区分SBS改性沥青与基质沥青的差异，而动态力学温度谱、G~*-δ黑斑图可以反映老化作用对SBS改性沥青的影响，且通过IR试验和GPC试验得出SBS改性沥青老化是沥青相的氧化和SBS的降解共同引起的；通过不同温度下SBS改性沥青混合料的旋转压实SGC试验，根据粘度与剪变率的关系，提出用剪变率60(1／s)测试SBS改性沥青的粘温曲线，并按照0.17±0.02Pa.s和0.28±0.03Pa.s确定施工温度。

The principle and the mathematical model of reduced-dynamic precise orbit determination are discussed based on precise point positioning technique by zero-differenced dual-frequency P codes and epoch-wise differenced carrier phase data. Then the key issue in the reduced-dynamic POD, i. e. the pseudo stochastic pulses and their impact on orbit determination accuracy are analyzed.

论述了基于低轨卫星星载GPS双频观测值的精密单点定位技术的简化动力学定轨方法的数学模型，分析了简化动力学定轨中的关键问题―伪随机脉冲的设置问题及其对定轨精度的影响。

4According to rationale of dynamic of structures,the program of finiteelement method that calculated largescale dynamic structure is finished.Using theprogram of finite element method,the dottier element of some model gas operatedof rapid-fire gun is calculated.

4根据结构动力学的基本原理编制了计算大型结构动力问题的有限元程序，对某型自动火炮自动机中较薄弱的元件进行了数值分析。

The research of this thesis is supported by China National Natural Science Foundation. The static and dynamic behaviour of slabs on foundation and doweled slabs of concrete pavement, identification and comparison of static and dynamic parameters are studied emphatically in this paper.

本文在国家自然科学基金项目资助下开展工作，着重研究了混凝土地基板与接缝板的静、动力特性及静、动力参数的识别与比较，主要包括以下几个方面的具有特色的内容。

ABSTRACT The research of this thesis is supported by China National Natural Science Foundation. The static and dynamic behaviour of slabs on foundation and doweled slabs of concrete pavement, identification and comparison of static and dynamic parameters are studied emphatically in this paper.

本文在国家自然科学基金项目资助下开展工作，着重研究了混凝土地基板与接缝板的静、动力特性及静、动力参数的识别与比较，主要包括以下几个方面的具有特色的内容。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。