鱼尼汀受体激活剂的研究进展

综述了鱼尼汀受体激活剂的三个品种,邻苯二甲酰胺类和邻甲酰胺基苯甲酰胺类鱼尼汀受体激活剂的结构与活性关系,并对其发展趋势和前景作了进一步展望.     

一个基于组件设计的模型

随着软件规模的愈发庞大,现代的软件系统正日益倾向于利用已存在的组件构造软件,以便促进软件生产率和质量的提高,一个组件提供了一线操作来对其内部状态进行读写,其中任何一个操作都是基于若干子组件构造而成,在此前提下,本文提出一个利用已存组件进行重用组件简单模型,在该模型中,首先建立了关于组件的三组描述;接口、说明和实现,这三级描述代表了对于组件的不同抽象层次;然后提出一种验且件语义的策略;利用Ｈａｒｅ     

动力学总势能不变值原理在质点系建模中的应用

根据虚位移概念和达朗贝尔-拉格朗日原理分析了虚位移过程中作用在质点系上的所有主动力和惯性力都不改变，可视为有势力，导出了质点系动力学总势能不变值原理．该原理是达朗贝尔-拉格朗日原理的延伸和发展，它具有以下特点：将矢量动力学和分析动力学有机结合；不需区分有势力和非有势力；有简洁、统一的表达形式；可简便建立复杂质点系的动力学方程等．此外，通过算例证明了该原理的正确性和有效性．     

结构振动的模糊可靠性分析

利用随机有限元理论建立结构振动的概率有限元计算公式系统，得出结构固有频率的均值及其方差；根据模糊集合理论的基本原理，在结构振动的可靠性分析中引入共振失效的模糊定义，指出共振准则具有模糊性．在此基础上。提出共振区模糊子集的隶属函数的确定原则，给出了具体的确定方法．根据模糊事件发生概率的定义,导出了结构振动的模糊可靠性的计算公式。考虑到结构具有多阶固有频率，在进行结构振动可靠性分析时,结构应为串联系统，从而解决了结构动态问题的模糊可靠性问题．通过结构振动模糊可靠度的计算实例，验证了该法的有效性和可行性，并指出常规可靠性计算由于不考虑共振区域的模糊性而使计算结果偏大．     

基于EBIT—EPS分析确定最优资本结构

最优资本结构指在公司的加权平均资本成本降到最低限度的同时，公司的市场价值和股票价值最大化的资本结构。EBIT—EPS分析法是一种方便有效的定量分析方法，因素分析法是一种不可或缺的定性分析法，企业最优资本结构的确定应采用定量分析与定性分析相结合的方式，即以EBIT—EPS分析法为主并辅之以因素分析法。     

自动化立体仓库货位分配概念数据模型的研究

高效的货位管理及货位分配是自动化立体仓库需要解决的主要问题之一，本在对几种货位储存策略进行分析的基础上，综合评定它们各自的优缺点，结合货位分配原则，提出了一种适合自动化立体仓库的货位分配概念模型及其实现方法。     

地铁屏蔽门的机械设计

本屏蔽门机械设计方案采用结构单元模块化、下部支撑可三维调节、上部支撑可伸缩，可满足地铁车站的特殊要求，已在工程上得到实际应用，本文介绍其主要部件、结构及部件的机械强度校核。     

校园无线局域网的安全探讨

对校园无线局域网的安全缺陷进行了综述,阐述了由于安全缺陷所导致的各种网络安全问题,提出了各种可行而且必要的安全策略,从而保证校园无线局域网的安全正常的运行。     

Isolation and identification of Rhodosporidium diobovatum DS-0205 from deep-sea sediment of eastern Pacific Ocean

A facultative heterotrophic strain (DS-0205) was isolated from a deep-sea sediment sample collected at a depth of 5.2 km in the eastern Pacific Ocean, China. Strain DS-0205 is motile helmet-like single cell or pairs, forming hemisphere with the center sunken of variable size. It has a widespread carbon source and nitrogen source, including agarose, citric acid, salicin, D-glucitol nitrate, sodium nitrite and ethylamine. It can grow in the following environment: temperature 4–37 °C, pH 2.0–12.0, tolerance to NaCl⩽15%. Two phylogenetic trees, one based on the ITS and 5.8S rRNA sequences and the other based on the 18S rRNA sequences, unite strain DS-0205(=JCM 0205) to the type strain of Rhodosporidium diobovatum JCM 3787 through a considerable evolutionary distance. These results suggest that strain DS-0205 is a new strain of the Rhodosporidium diobovatum.     

Exploring harmonious development between urbanization and eco-environment based on climate analysis—A study in Changsha,China

The process of urbanization affects the urban warming. The change of urban warming was investigated by several urbanization factors in Changsha, China. The data of surface temperature (minimum, maximum and mean) of Changsha were analyzed to understand the possible effects of urbanization on the climate of this region owing to the population growth, built-up area expansion and energy consumption increases. The weights of these three factors were calculated by the analytical hierarchy process (AHP). Then, three weights were simulated with nonlinear method to obtain the urbanization development rate which was utilized to reveal the influence of the urbanization factors on the surface temperature. The result shows that there is a significant upward trend in the urban temperatures of Changsha. The temperature increase seems to be closely related to the rate of urbanization between 1993 and 2008, and there is an evidential increase trend of the influence on urban temperature by urbanization during 16 years. It is a quantifiable approach measuring the relationship between urbanization and urban eco-environment, and can be applied for the urban sustainability.