Limiting survival functions of self‐similar structures

We show the existence of a unique analytic single parameter limiting survival function arising from the repeated composition of a coherent structure as the number of components tends to infinity. Examples include the repeated composition process of the bridge structure. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2004.     

Bivariate models from univariate life distributions: A characterization cum modeling approach

Bivariate life distribution models are of importance for studying interdependent components. We present a generic approach by introducing a new concept of characterized model in stead of a characterized distribution. It strikes a balance between characterization and modeling approaches to eliminate their individual limitations and incorporate their respective strengths. The proposed model, being a characterized one, admits many important properties irrespective of the choice of marginal distributions. The retention of univariate IFR, DFR, IFRA, DFRA, NBU, and NWU class properties in the bivariate setup has been ensured along with some results on series combinations and convolution. No other models, available in the literature, can ensure simultaneous retention of these fundamental and extremely important class properties. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

Warranty costs: An age‐dependent failure/repair model

An age‐dependent repair model is proposed. The notion of the “calendar age” of the product and the degree of repair are used to define the virtual age of the product. The virtual failure rate function and the virtual hazard function related to the lifetime of the product are discussed. Under a nonhomogeneous Poisson process scenario the expected warranty costs for repairable products associated with linear pro‐rata, nonrenewing free replacement and renewing free replacement warranties are evaluated. Illustration of the results is given by numerical and graphical examples. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004.     

A general approach to the shape of failure rate and MRL functions

Failure rate and mean residual life are two important characteristics for studying reliability of products. In literature, some work studied the shape of failure rate function based on the knowledge of the associated probability density function; some other work investigated the shape of mean residual life function based on the shape of the associated failure rate function separately for continuous case and discrete case. In this article, a general approach is developed which can be applied to the aforementioned studies. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

R-C系统中由表面散射引起的视场内杂散光分布

推导了R-C系统焦平面上由主镜和次镜表面散射引起的视场内杂散光分布的近似解析表达式.针对典型R-C系统的视场内杂散光分布,由近似表达式得到的计算结果与利用商业光学仿真软件得到的模拟结果具有较好的一致性,说明了近似表达式的正确性.与焦平面上无像差衍射光分布相比较,可以方便地分析强光入射时R-C系统焦平面上不同区域的饱和机制.研究结果表明,对于典型的R-C系统,探测器表面上以几何像点为中心,半径为2.5mm的范围内,衍射光是引起探测器饱和的主要因素;在此范围外,表面散射造成探测器的饱和.该结果为进一步研究强光饱和实验,解释有关现象提供理论分析基础.     

美军思想教育的历史特点与启示

思想教育是加强军队全面建设、完成各项任务的中心环节,各国军队都十分重视。美军是当今世界各国军队建设中总体水平最高的一支军队。其社会制度性质的不同,决定了美军与我军在思想教育内容上有着本质的区别,但美军对军人进行思想教育的方式方法有值得我们借鉴的地方。考察美军思想教育的历史,总结其特点,得出几点启示,目的是为了不断创新发展我军思想政治教育的形式方法,增强实际效果。     

武警部队远程教育培训探讨

针对武警部队集中学习相对困难的情况,对当前远程教育培训模式进行了探讨,分析了远程教育中的资源建设问题,并以《汽车构造》课程为例进行了网络课程的开发,为武警部队培养高素质的现代官兵队伍提供有益参考。     

兵团中学数学教师教育科研现状调查与分析

数学教师是数学教育工作中的主体力量,其教育科研水平直接关系到数学教育专业化的进程。调查发现,兵团中学数学教师的教育科研水平尚处于起步阶段。为提高教师的教育科研水平,应加强以下几个方面的工作:正确认识教学与教育科研的关系;加强教育理论著作、中学数学期刊的阅读;有效利用各级培训,强化对教师的教育科研能力的培养;上级主管部门以及学校应加大对教师从事教育科研的支持力度;建立兵团教育学院和兵团中小学的长期协助、合作关系。最后,兵团教育学院还应考虑创建一份中学数学期刊。     

大学生诚信教育的现状与对策

诚信是社会和谐、国家发展进步和大学生成才的根本要求,是大学生立身处世之本。本文针对当前部分大学生诚信缺失的现状,分析大学生诚信缺失的原因,提出了加强大学生诚信教育的措施。     

论英语教学中学生创新能力的培养

创新教育是以开发创新性思维为核心、以培养创新性人才为基本价值取向的教育。在英语教学中,应大力推行实施创新教育,激发学生的创新性思维,引导学生进行创新性学习,从而提高学习效率,获得最佳学习效果。教师要"授之以渔",营造创新环境,有效培养学生和创新思维能力及创新意识。