A New Fatigue Life Model Based on the Family of Skew-Elliptical Distributions

ABSTRACT

Fatigue is structural damage produced by cyclic stress and tension. An important statistical model for fatigue life is the Birnbaum–Saunders distribution, which was developed to model ruptured lifetimes of metals that had been subjected to fatigue. This model has been previously generalized and in this article we extend it starting from a skew-elliptical distribution, the incorporation of the elliptical aspect makes the kurtosis flexible, and the skewness makes the asymmetry flexible. In this work we found the probability density, reliability, and hazard functions; as well as its moments and variation, skewness, and kurtosis coefficients. In addition, some properties of this new distribution were found.     

马克思哲学的本体与特质及其价值取向之我见

马克思哲学以对象为基点,以实践为特色,因而是一种超越传统本体论的物质本体论;实践内涵的科学规定和地位提升,使其成为马克思哲学的特质和超越旧哲学的关键;发挥哲学的实践指导功能,谋求人类解放,达成真善美的统一,是马克思哲学的价值指向,彰显着马克思哲学对人类命运的终极关怀。     

The transitional impacts of material and service offshoring

The recent expansion of offshoring intermediate services has given rise to public fears and a possible pullback from a liberal trading system. Modeling and estimating intermediate offshoring is complicated since the shock is further down the production process. This paper incorporates the necessary transmission mechanisms into a data-intensive CGE model for the State of Colorado to estimate the current and future impacts of continuing a liberal trade policy for offshoring intermediates. The results indicate that while the overall effects of offshoring are small and positive, the future directions of service offshoring are projected to cause sizable domestic job destruction and displacement. Policies may have to be implemented to retrain domestic workers who face job loss or even consider curtailing future offshoring opportunities.     

大学英语听说教学资源的开发与利用

语言输出理论认为语言习得过程应该是一个输入与输出的双向过程,二者结合才能提高学习者第二语的流利程度和准确性。在大学英语听说教学中恰当开发英美影视材料能够开辟一种学生熟悉的、更加多元、有趣有效的语言输入环境,激发学生英语认知资源的主动输出,形成听、说教学的良性循环和相互促进。将英美影视材料合理融入教学是培养学生的英语综合应用能力尤其是听说能力,达到教学目标的有益尝试。     

新闻评论专栏“冰点时评”大众性探析

在全球传媒领域迅速发展的今天,广大受众的参与意识日渐增强。新闻评论作为媒体和受众交流的平台及公众畅所欲言的阵地,其大众性越来越鲜明地体现出来,包括选材、立意、作者等诸多方面。新闻评论的大众性是我国新闻事业道路上的里程碑,突破了以前作家写稿、读者读稿的模式,使作者与读者之间的界限不再明显,越过了只闻一家之言的鸿沟。《冰点...     

新疆城乡女性人才相关因素比较

主要依据"新疆女性人才资源开发利用研究"课题组问卷调查数据,从新疆城乡女性人才的物质待遇状况,对外在环境的评判和性别意识三个方面,对新疆城乡女性人才发展的相关因素予以揭示和比较。     

第X方物流理论

基于物流 (MF) [1 ] 的属性和企业发展理论 ,在国内首次提出物流新理论———“第X方物流”(X’sPartyMaterialFlow ,简称XPMF)。认为第X方物流不仅指由某一方提供的物流服务业务模式 ,更重要的是指由各有关方综合提供的物流服务业务模式。物流理论和实践证明 ,企业不可能采用某一种固定的物流服务业务模式 ,采用哪种物流服务业务模式是一个事先不能确定的未知数 ,需要根据具体情况进行科学决策 ,故名第X方物流。第X方物流理论符合物流服务业务模式的发展规律。讨论了第X方物流的概念和其运作性质     

《遗传优生》内容调整刍议

现在使用的《遗传优生》教材,是16年前编写的,内容陈旧,只有经典遗传理论而缺乏对优生实践的指导,不符合我院遗传优生教学大纲的规定,不适应人口与计生专业培养人才的需要。所以,应对《遗传优生》加以调整和充实:把细胞学、遗传学、遗传病及其预防与预测等方面的遗传理论与优生实践紧密结合在一起,并补充性细胞保护、遗传规律、婚配关系等在优生方面的作用以及人类基因组计划等相关知识和最新科研成果,为提高出生人口素质,降低出生缺陷率服务。     

关于“材料成形及控制工程”专业教学改革的探索与实践

“材料成形及控制工程”是一个内涵丰富,具有老专业背景的新设专业。文章探讨了该专业在专业建设与教学工作中所遇到的课程设置、课堂教学、实践教学等问题,阐述了初步解决这些问题的办法。其改革与建设所贯彻的基本思想是:顺应我国高等教育专业改革的趋势,拓宽培养口径,强化学生的综合素质和能力训练。初步实践结果表明,这些专业教学改革举措取得了良好的效果,即学生的知识面得到了加宽、综合素质得到了提高,增强了毕业生对社会的适应性,为专业的建设奠定了良好的基础。     

THE MEASUREMENT AND OPERATING BENEFITS OF COMPONENT PART COMMONALITY

The product structure is a key input to a material requirements planning system. Yet, the effect of alternate product structure designs on system performance is not well understood. Analytical measures are needed to accurately relate product-structure characteristics to total cost and delivery performance. A new analytical measure of product structure called the degree of commonality index is defined in this paper. The degree of commonality index can be applied to single end items, product families, entire product lines, or to any level of product structure. This study suggests that component part commonality, as measured by the degree of commonality index, has a significant effect on system performance. For example, company standardization programs that increase the degree of component part commonality result in manufacturing cost reductions. The degree of commonality index provides a way to directly relate the degree of component part commonality to various dependent variables such as total cost, work center load, and delivery performance.