基于混沌免疫进化算法的汽车主动悬架控制策略研究

提出一种基于混沌免疫进化算法的1/4汽车主动悬架控制方法.在免疫进化算法的基础上,利用混沌运动的特点,对初始种群混沌初始化,且根据个体评价值对群体进行不同幅度的混沌载波,既可保护优秀个体,又可进行遍历搜索,跳出局部极小值,达到快速寻优的效果.仿真结果表明:与免疫进化控制比较,采用混沌免疫进化控制,汽车的平顺性和安全性得到了更好的改善.     

基于组合进化算法的混沌系统控制与同步

混沌系统控制与同步可通过优化方法设计控制律引导混沌系统轨道来实现.构造适当的适应度函数,将混沌系统的控制与同步问题转化为一个多维的数值优化问题,然后提出一种新的组合进化算法来求解该优化问题.该算法利用佳点集方法初始化种群个体以保证其均匀分布在搜索空间中.在迭代过程中,组合不同进化算子以产生若干个新的子代个体以保持种群的多样性.以典型的Hénon混沌系统为例进行仿真实验,结果表明了该方法是解决混沌系统控制与同步的一种有效方法.     

基于混沌迁移策略的多种群差分进化算法

针对差分进化算法全局寻优效率偏低的弱点,提出了一种基于多种群的混沌迁移策略,用以改进常规差分进化算法。该策略通过在多种群并行进化过程中引入混沌迁移序列,引导个体进行种群间的迁移。利用混沌的遍历性和随机性,保证子种群之间能够进行充分高效的信息交换。仿真实验和PID控制参数优化应用表明:该算法具有很强的全局搜索能力,寻优效率高,有效地克服了基本差分算法的早熟收敛问题。     

基于混沌遗传算法的PHEV能量管理策略优化

提出了一种新的混沌遗传算法,改进了混沌映射和遗传算法的结合方式,使种群在进化的过程中能够混沌搜索解空间,从而增强遗传算法的遍历性.该算法有效地克服了遗传算法局部收敛的缺陷.在软件ADVISOR2002中,以一辆采用模糊能量管理策略的插电式混合动力电动汽车(Plug-in Hybrid Electrical Vehicle,PHEV)为研究对象,应用该混沌遗传算法对其隶属函数和控制规则进行了优化.仿真结果表明,该算法可以实现对模糊控制器的全局优化.与原模糊控制策略相比,优化后的燃油经济性提高了5.15%,CO排放减少了6.39%.     

创发性 DNA 计算模型及其混沌系统辨识过程

针对非线性信息处理的特点,提出了一种新的ＤＮＡ计算模型．该模型以创发性机制为基础,引入合理的元进化算子,并由混沌动力学系统构造相应的演化过程．所设计的与上述模型相联系的混沌进化算法,属于一种新型的ＤＮＡ算法．从将其应用于Ｈéｎｏｎ方程辨识的结果来看,所构造的模型和算法是有效的,由于非线性控制系统中混沌现象的存在,它们在自适应控制器的设计和应用中具有重要的科学意义和较为广阔的前景．     

混沌伪并行遗传算法及其在火力分配优化中的应用

剖析了混沌模型的随机性、遍历性和初值敏感性的特点,提出了多种群伪并行混沌遗传算法.把多群体伪并行进化的并行性和混沌运动的内在随机性结合起来,利用不同的混沌扰动策略,把混沌变尺度映射机理应用到种群初始化和中间群体的优化进化实现函数优化.仿真结果表明,混沌伪并行遗传算法比伪并行遗传算法和简单遗传算法具有更快的收敛速度和更高的最优解搜索成功率,可对火力分配进行优化.     

不同系统之间的混沌同步

基于稳定性理论,针对SQCF系统和SCCF系统提出了两种不同系统之间的混沌同步控制策略：一是选取一正定的李亚普诺夫函数,基于李亚普诺夫直接法求出混沌同步的控制量,从而使两个不同的系统达到混沌同步;二是运用激活控制法实现两个不同系统的混沌同步．这两种方法均适用于一般的混沌系统,并用Mathematica软件给出了数值模拟．理论分析及仿真结果都表明该方法可以较快地实现不同系统之间的混沌同步．     

Lū系统的控制与同步

提出了一种新的控制混沌和同步的方法．这种方法以稳定流形理论为基础，通过设计合适的控制器将混沌系统引至目标轨道，使混沌得以控制和同步．将此方法运用于Lū系统，并通过数值模拟进一步验证这一方法的可行性和有效性．     

进化算法的改进与应用

通过分析进化算法对全局收敛性的影响 ,本文提出用混沌模型构造一种随机开关 ,以此控制进化算法中的变异运算 ,同时将模拟退火用于进化算法的选择过程 ,从而增强算法的快速收敛性能 ,最后把改进的进化学习算法用于系统的参数辨识 ,取得了满意的结果     

控制混沌的研究现状与展望

综述了近年来在控制混沌这一非线性动力学新领域的研究进展．介绍了控制混沌的目标、意义及研究概况;阐述了控制混沌的几类主要方案的内容、特点及应用,方案包括输送控制、镇定控制和自动化技术的应用;分析了各类方案的现状,并展望了控制混沌的发展趋势．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that