Structural equation models for area health outcomes with model selection

Recent analyses seeking to explain variation in area health outcomes often consider the impact on them of latent measures (i.e. unobserved constructs) of population health risk. The latter are typically obtained by forms of multivariate analysis, with a small set of latent constructs derived from a collection of observed indicators, and a few recent area studies take such constructs to be spatially structured rather than independent over areas. A confirmatory approach is often applicable to the model linking indicators to constructs, based on substantive knowledge of relevant risks for particular diseases or outcomes. In this paper, population constructs relevant to a particular set of health outcomes are derived using an integrated model containing all the manifest variables, namely health outcome variables, as well as indicator variables underlying the latent constructs. A further feature of the approach is the use of variable selection techniques to select significant loadings and factors (especially in terms of effects of constructs on health outcomes), so ensuring parsimonious models are selected. A case study considers suicide mortality and self-harm contrasts in the East of England in relation to three latent constructs: deprivation, fragmentation and urbanicity.     

On the distribution of some test statistics connected with the multivariate linear functional relationship model

An alternate representation of the densities of some test statistics for the structural coefficients of the multivariate linear functional relationship model is proposed in this article. These statistics are distributed as the ratio of a linear combination of chi-square variÂtes over the root of a product of chi-square variÂtes. A computable representation of their densities has already been derived by Provost (1984) with the help of the technique of the inverse Mellin transform. The connection of the alternate representation to the densities of products of independent beta type-2 and of independent F-random variables is also discussed.     

回转曲面体在斜二等轴测图中的视觉倾斜

从机械制图国家标准GB44583 - 84的斜二等轴测图出发 ,定义并证明了回转曲面体在斜二等轴测图中的计算机绘图存在的视觉倾斜现象     

流体力学新型通用函数Y的变分有限元分析

本文应用通用函数Y及其变分原理,为求解具有自由面流动问题提出了一种新方法。将物理平面变换成映象平面。在映象平面上,引出通用函数Y,并且写出关于Y的变分原理。用这个变分原理及有限元法求解自由面流动可克服边界未知的困难。文中以水坝闸门出流问题为例进行了计算,结果表明,该方法是非常有效的。     

结构合力学分层次教学

随着普通高校由过去的精英教育向大众化教育的转变,现有的教育理念和教育模式已不能完全适应当前高校的发展需要。针对广西工学院土木建筑工程系结构力学教学的现状,提出了在结构力学课程实施分层次教学。经过探索和实践,取得了良好的效果。     

基于NURBS方法的转子表面造型技术

采用双三次NURBS方法对某型号转子进行几何造型,对造型过程中出现的曲面延伸、求交和裁剪等问题进行了研究.根据叶片的形状特征,以曲线的几何形式为基础,提出了一种简单实用的曲线曲面延伸方法,实现了切矢量连续的叶片型面的延伸.对于两相交面分别为自由曲面和解析曲面的求交问题,提出了一种简化的跟踪算法,实现了转子叶片型面和圆台面的准确求交和裁剪,从而实现转子精确的几何造型.     

艺术创意的设计素描

设计素描还没有明确的界定 ,但它具有艺术想象、塑造新的形象、设计素描者的“心中的画”的特点和内涵 ;要使设计素描有创意 ,就应该有理性的结构、构图和取于自然物的素材 ,并正确地运用点、线和面的组合     

中美节庆文化的表征与内涵分析及其启示

为了使节庆这个承载着独特民族传统的文化介质更好地适应并服务于现代文明,通过对美国和新中国各自主要的节庆实践进行定量描述,在归类和比较的基础上,定性分析了中美两国节庆的不同特征、功能及价值重心取向,认为我国现行的官方、民间二元结构的节日体系应该朝着尽量谐和的方向改革,官方节日频率应该增加。     

论《长生殿》的表层叙事与深层悲剧意蕴

以洪?的真情观为切入点,交互采用文献研究和接受美学的分析方法,对《长生殿》借离合之情写兴亡之感的悲剧叙事形态进行了深入阐释。洪?以"至情"为标举,将不会触犯时忌的李杨情缘作为戏剧的表层叙事,而深层的情感潜流则是被强化了的历史兴亡感,从而使得时代性的秘密情感——汉族文士被压抑在心底深处的亡国之痛得到了淋漓尽致的宣泄。     

论经济法学研究中的结构性研究

中国经济法学30年的成就在一定意义上得益于包括结构性研究在内的独特研究风格.经济法学界之所以特别重视结构性研究,原因在于研究对象和研究背景的特殊要求.研究实践表明,结构性研究对于遵循和揭示现代市场经济的运行规律,分析和设计法律与经济的互动,具有其优越性;结构性研究应当与普适性研究相结合.且应具有开放性和灵活性.