一种新型大过载飞行模拟器运动仿真分析

提出一种新型的基于绳牵引并联机器人技术的飞行模拟器,针对其大过载机动特性进行仿真分析。首先根据绳牵引并联机器人理论,设计了9根绳牵引具有6自由度的运动平台;通过建立平台动力学模型,设计了对干扰项进行补偿的前馈PD控制率;其中前馈项主要确保动态过程中绳索处于张紧状态。进一步给出了系统控制稳定性分析;并以大过载机动和单自由度俯仰振荡运动为例进行了数值仿真。分析结果表明,在大过载机动情况,瞬时正加速度超过4 g,平台位置能够迅速衰减并稳定;基于绳拉力前馈,可以避免绳索松弛,能够满足飞行员过载训练;俯仰运动也具有较好的跟踪特性。研究成果可为进一步分析工作空间、动态特性及控制稳定性等奠定基础,为绳牵引并联支撑的飞行模拟器设计提供指导与依据。     

脑循环Willis环控制方程

在循环Ｗｉｌｌｉｓ环定常流模型和脉动流模型的基础上，进一步讨论模型控制方程的求解方法，由于脑部血液循环的复合性，验证脑循环动力学模型和实验循环的相符程度有着重要的意义，通过求解集中参数模型的数据和临床数据的对比，验证了脑循环模型的正确性，并对时域状况进行了分析。根据脑循环集中参数模型对脑部血液循环模型的正确性，并对时域状况进行了分析，根据脑循环集中参数模型对脑部血液循环的代偿功能和其对单侧血液参数     

Transforming Self and Society: A "Critical Appreciation" Model

This paper sets out to uncover some relationships between reflection, discourse and action. By challenging and synthesizing some polemical arguments concerning the creation, maintenance, and transformation of self and society, a model of self-society dynamics that operates through reflection, discourse, and action is developed. The model of self-society dynamics brings together aspects of self-reflection and ideology-critique (explored in the paper), which it is suggested are required for any intervention (transformative action) to be grounded in locally meaningful ways. By creating a dialog community in which self- and group assumptions can be subjected to validation through discourse, it is proposed that a dynamic balance between individual needs and broader societal aims may be achieved. If individuals can be open to such discourse (i.e., they can become critically self-reflective), then it is argued that possibilities for achieving sustainable change will be significantly enhanced.     

带电聚合物刷的分子动力学模拟和研究

主要介绍通过分子动力学模拟来研究带电聚合物刷在水溶液和盐溶液中的结构性质，分别给出不同吸附密度下的单体密度，补偿离子分布图。通过模拟得到的刷子高度与通过新标度理论得到的高度值吻合的很好。验证了在渗透区，吸附密度对刷子的高度是存在影响的，并讨论了在同一吸附密度下，Debye长度对刷子结构的影响，刷子的高度随着Debye长度的增大而变大，进而达到通过盐离子浓度来控制刷子结构的目的。     

蛇形移动输送机结构设计与动力学建模

介绍了新型蛇形移动输送机方案设计、结构设计中采用的方法和手段，并且针对结构的特殊性，构建了包括动力系统、张紧系统、机架、转向油缸以及输送机带的纵向动力学耦合模型。     

小级超越整函数Fatou分支的有界性(英文)

给出了级小于二分之一的超越整函数的Fatou分支有界性的几个充分条件.     

利用“SD”仿真模型分析综采工作面生产系统

利用系统动力学理论，对影响综采工作面生产的主要因素进行因果关系分析，并在此基础上建立起综采工作面生产系统的“ＳＤ”仿真模型，以实现综采工作面生产系统的模拟分析.     

CONVERGENCE IN THE CHEMOSTAT MODELWITH DELAYED RESPONSE IN GROWTH

1.IntroductionThechemostatisalaboratoryapparatususedforcontinuouscultureofmicroorganisms.Itcanbeusedtostudycompetitionbetweendifferentpopulationsofmicroorganismsforagrowthlimitingsubstrate,andhastheadvantagethatcertainofthebiologicalparameterspresumedtoinfluencecompetitiveoutcomecanbecontrolledbytheeXPerimellter.TheglobalanalysesofthechemostatmodelwithMichaelis--MentenkineticsfornutrielltuptakeweregivenbyHsu,HubbedandWaltmanin[2]andHsuin[31.Undertheassumptionthatalltheparametersaredistinct…     

A Comparative Study of William Golding's Four Novels

With his keen insight, William Golding becomes very conscious of the darkness of the human heart and the necessity that we become aware of this darkness if we are to save ourselves. All his novels, therefore, attempt to deal with the essential human condition. All Golding＇s novels, products of his peculiar literary temperament and habit, are reactive experiments. Each of them represents a response to a specific book by an early writer.     

Spatio.temporal variations of the bacterioplankton community composition in Chaohu Lake,China

Despite considerable attention paid to Chaohu Lake in China,the dynamics of bacterioplankton community composition(BCC) on spatial and seasonal scales are poorly understood.In this study.water samples were collected from autumn 2006 to summer 2007 at five positions in Chaohu Lake with different trophic status.BCC of these samples was determined by both the PCR amplifieation of the 16S rDNA gene and the denaturing gradient gel electrophoresis (DGGE).The abundance and diversity of bacterioplankton communities at different sampling positions showed similar seasonal pattems.The BCCs in the samples varied substantially,and the pattern of changes indicated that the seasonal difiefence might have a significant impact on the BCC'S structure iU the lake.Canonical correspondence anal-ysis(CCA)on the DGGE patterns and physicochemical parameters indicated that the temperature and the levels of 5-d biochemical O2 demand(BODs),NH3-N,CODMn,total nitrogen,total phosphorous,and dissolved oxygen significantly influenced the BCC,and four of the seven variables were related to the level of eutrophication.Our results indicate that eutrophic status and season are the most inttu-ential factors in determining BCC in Chaohu Lake.