以设计为主线、三维为核心的工程图学教学改革--现代工程设计图形学(MEDG)教学研究与实践

工程设计现在已发展到全数字化阶段,能使设计、制造一体化过程得以实现的核心是三维几何模型,二维投影图已不是这一过程所必需的文件.因此,在总结和继承原教改成功经验的基础上,我们对传统的工程图学课程进行改革,突出"三维"和"设计"两个重点,形成了现代工程设计图形学(MEDG)课程体系.     

重庆市高校“两课”教学情况调查及对策研究

加强和改进“两课”教学 ,提高“两课”教学质量是培养和造就社会主义现代化建设人才的重要环节。全面了解高校“两课”教学情况是促进“两课”教学改进的重要举措。     

确立科学的思想观点 正确理解和推进“两个转变

实现计划生育工作思路和工作机制、运作方式的“两个转变” ,是我国计划生育的一项战略决策。本文论述了计生工作者应如何树立科学的思想观点 ,正确理解和推进“两个转变”     

Tests for Equality of Parameters of Two Exponential Distributions with Common Known Coefficient of Variation

ABSTRACT

This article considers the problem of testing equality of parameters of two exponential distributions having common known coefficient of variation, both under unconditional and conditional setup. Unconditional tests based on BLUE'S and LRT are considered. Using the Conditionality Principle of Fisher, an UMP conditional test for one-sided alternative is derived by conditioning on an ancillary. This test is seen to be uniformly more powerful than unconditional tests in certain given ranges of ancillary. Simulation studies on the power functions of the tests are done for this purpose.     

理工院校“两课”实践教学探索

本文阐述了理工院校“两课”实践教学的意义，探索了新时期理工院校“两课”实践教学的模式，提出了“两课”实践教学中应注意的问题。     

E-optimal designs for three treatments

E-optimality is studied for three treatments in an arbitrary n-way heterogeneity setting. In some cases maximal trace designs cannot be E-optimal. When there is more than one E-optimal design for a given setting, the best with respect to all reasonable criteria is determined.     

论《二马》中的"陌生化"技巧

老舍在旅英期间写成的域外小说《二马》,讲述了来自"文明古国"的中国人在英国的一段饶有意味的生活故事。本文拟用俄国形式主义的"陌生化"理论对老舍的《二马》进行解读,认为在《二马》中,老舍对小说的语言、故事情节和叙事结构等进行了"陌生化"处理,从而使作品呈现出新奇陌生的艺术效果。     

论邓小平“两个大局”的战略构想

世纪之交，以江泽民为核心的党中央第三代领导集体作出加快中西部地区发展的战略决策，启动中西部大开发伟大工程。这一决策的理论依据，就是邓小平的“两个大局”的战略构想，全面领会邓小平“两个大局”和共同富裕的思想对于贯彻实施西部大开发工程，具有重要的意义。     

气液混合物通过孔板的修正能量流动模型及其在双参数流量测量中的应用

根据能量方程能确切地反映气液双相流动中的不可逆损失这一特点,在劳伦兹能量模型的基础上,本文提出了新的截面含气率的计算方法,从而得到了修正分相能量模型,并以此作为处理数据的依据。作者用三块不同截面比的安装在管径为50.8mm的管道上的锐缘孔板,分别与口径为100mm的椭圆齿轮流量计组合进行了试验,试验结果表明,利用此模型处理数据时,不必考虑孔板截面比的影响,也不必考虑被测介质干度范围的影响。在本试验的范围中,(0.00111相似文献   

Effects of Remanufacturable Product Design on Market Segmentation and the Environment

Despite documented benefits of remanufacturing, many manufacturers have yet to embrace the idea of tapping into remanufactured‐goods markets. In this article, we explore this dichotomy and analyze the effect of remanufacturable product design on market segmentation and product and trade‐in prices by studying a two‐stage profit‐maximization problem in which a price‐setting manufacturer can choose whether or not to open a remanufactured‐goods market for its product. Our results suggest that it is optimal for a manufacturer to design a remanufacturable product when the value‐added from remanufacturing is relatively high but product durability is relatively low and innovation is nominal. In addition, we find that entering a remanufactured‐goods market in and of itself does not necessarily translate into environmental friendliness. On the one hand, the optimal trade‐in program could result in low return and/or remanufacturing rates. On the other hand, a low price for remanufactured products could attract higher demand and thereby potentially result in more damage to the environment. Meanwhile, external restrictions imposed on total greenhouse gas emissions draw criticism in their own right because they risk stifling growth or reducing overall consumer welfare. Given these trade‐offs, we therefore develop and compare several measures of environmental efficiency and conclude that emissions per revenue can serve as the best proxy for emissions as a metric for measuring overall environmental stewardship.