GSM光束与表面粗糙度

激光束照射到粗糙表面时,其散射光可以看成是GSM光束,从这一观点出发,建立了表面粗糙度参数与GSM光源特征参数之间的关系,进而分析了散射光束的横向和纵向相干特性。本文提出的模型与已有报道的实验比较,符合得相当好。     

恒液位水箱侧槽水面线的数值计算和实验研究

本文从流体力学基本原理出发,建立了水流量标准装置恒液位水箱侧槽流动的基本微分方程式,并运用数值方法求得其近似解。根据有限差分法计算的侧槽水面线与实验结果基本吻合。在此基础上,本文分别对于水平和倾斜槽底这两种情况提出了进行工程设计的方法和实用计算公式。至此,作为文献[1]、[2]的延续和补充,本文完全解决了水流量标准装置恒液位水箱水面结构的设计方法问题。     

金属与型壳界面作用对精铸件表面质量的影响

讨论金属与型壳界面作用对精铸件表面粗糙度和粘砂缺陷的影响。面层涂料中加入少量氧化铁，可有效地防止钢铁精铸件的表面粘砂缺陷。     

晋西三川河流域的地表组成物质及其与土壤侵蚀的关系

地表组成物质是影响三川河流域土壤侵蚀及滑坡发育的重要因素。本文在分析该流域的地表组成物质的类型、性质及分布规律的基础上,探讨了地表组成物质与土侵馒蚀的关系。     

有耗介质涂覆导体平面上的表面波分析

用横向谐振法分析有耗介质涂覆导体平面上的表面波。结果表明,这种表面波在传播过程中将受到衰减,但不辐射。可见,用有耗介质材料涂覆的雷达目标上的表面波对RCS将没有直接的贡献,但是当传播过程中遇到不连续性或不均匀性时,表面波可能转变成新的辐射源,因此应当考虑对表面波的抑制。     

MATLAB在工程图学中的应用

计算机技术的发展为工程图学注入了新的活力。从引入计算机辅助设计理念到融合数学与计算机图形学技术,都影响着工程图学课程的内容和教学方式。本文分析了传统图学投影理论中所包含的数学信息,增强了"图"与"数"的内在联系,为传统图学理论更加实用发掘新的契合点。     

水库水面用地性质及水利水电建设项目用地保障研究

综合分析了水库及水库水面用地的定义、性质及特点。运用实例分析,研究了水库水面用地在水利用地中的比例及水库与其他水体的异同,认为水库水面用地宜归入水域类用地,而非建设用地。按照国土资源部探索水利水电用地精细化管理的要求,提出了改进水利水电建设项目用地审批的相关对策。     

Modified ridge analyses under nonstandard

A well-known procedure for the optimization of a second-degree response function over a spherical region of interest is that of ridge analysis. Khuri and Myers (1979) introduced a modification of this procedure by incorporating a certain constraint on the prediction variance. Both procedures, however, assume that the response variable has a constant variance throughtout the experimental region. In the present article, we consider two extensions to Khuri and Myers modifioed ridge analysis. The first extension relaxes the constant variance assumption. In the second extension. generalised linear models are used instead of the trasitional linear model. which are commenly used in responce variables that are not necessaily continusly distribution, including these have discreate distributions, Two examples are presented to illustrate the implementation of the proposed extensions.     

Semiparametric ROC surface estimation for continuous diagnostic tests via polytomous logistic regression procedures

In this paper, we propose a semiparametric method of estimating receiver operating characteristic (ROC) surfaces for continuous diagnostic tests under density ratio models. Implementation of our method is easy since the usual polytomous logistic regression procedures in many statistical software packages can be employed. A simulated example is provided to facilitate the implementation of our method. Simulation results show that the proposed semiparametric ROC surface estimator is more efficient than the nonparametric counterpart and the parametric counterpart whether the normality assumption of data holds or not. Moreover, some simulation results on the underlying semiparametric distribution function estimators are also reported. In addition, some discussions on the proposed method as well as analysis of a real data set are provided.     

Stereological formulas for stationary surface processes

In the paper surface processes are considered, i.e. sets of surfaces distributed at random in the space. For translation invariant surface processes the PALM distribution of the direction of the normal in a typical surface point is defined and related to two roses of intersection. Fibre and point processes are studied which result by intersections with planes and lines respectively. For these processes stereological formulas are proved which connect some quantities with such of the surface process. As a special ease motion invariant, i.e. translation invariant and isotropic, surface processes are treated, Furthermore, weighted surface processes are considered.