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关键词： 激光斜冲击   椭圆   受力变形  

摘要： 金属板材的激光冲击成形通常采用激光束垂直作用于工件表面,产生垂直于表面的冲击波作用力使板料变形,但在曲面零件成形时很难满足法向垂直冲击,因此有必要对斜冲击下板料力学变形特性进行研究。本文研究了激光斜冲击受力变形模型,对板料深度方向(z轴)变形公式、板料短轴(y轴)在水平方向上变形公式进行了理论推导计算,通过把两变形合成,得到短轴(y轴)在空间内总变形公式,最后把实验测量结果与理论计算结果进行了比较,得出两者相符的结论。

关键词： 反例   连续   可导   发散   收敛  

摘要： 数学分析中有许多重要的典型反例,这些反例是数学分析理论不可缺少的重要组成部分,教师在教学中要重视反例的教学,加强学生对反例的学习和运用,提高学生运用反例解决问题的能力.

关键词： 解析方法   岩土力学   中国力学学会   数值分析   数学分析   会议   委员会   研讨会  

关键词： 数学分析   高等学校   解题  

ISBN: (纸本)7560938914

摘要： 吉米多维奇的《数学分析习题集》是一部经典的、有代表性的习题集。本书根据我国现代目前的数学情况，选编习题集中的1/3的习题进行了详细的解答。

关键词： 数学分析   高等学校   解题  

ISBN: (数字)7560938922 ISBN: (纸本)7560938922

摘要： 本书下册涵盖习题集各章节。内容包括：级数、多变量函数的微分法、带参数的积分、重积分和曲线积分。

关键词： SEMICONDUCTORS   ELECTRON beams   PARTICLE beams   PARTICLES (Nuclear physics)   ELECTRIC conductivity   MONTE Carlo method  

摘要： Electron beam induced current (EBIC) is often used to evaluate minority carrier properties in semiconductors. Various mathematical models have been proposed;the most advanced is that of Bonard and Ganiere [J. Appl. Phys. 79, 6987 (1996)]. However, in order to apply this model to EBIC experiments, the lateral and depth distributions of the electron-hole-pair generation in the sample must be known. This letter presents a straightforward method based on Monte Carlo simulation of the electron beam interaction with the sample to evaluate these distribution parameters. A quantitative experimental example from a GaN-based light emitting diode is presented to test the proposed method.

关键词： 数学分析   创新能力   数学建模   数值计算  

摘要： 数学分析是信息与计算科学专业一门重要的基础课,在教学实践中探索和总结将传授知识、培养能力、提高素质有机结合的有效途径。

关键词： 数学分析   极限   因材施教  

摘要： 数学分析课程的难度较高，为在要求大体一致的前提下使高考数学成绩偏低的区内学生增强信心，提高兴趣，完成进度，需要研究学生，研究教材，由易到难，斟材施教，加强有针对性的重点辅导。

关键词： elliptic curve   cryptography   Koblitz curves   tau-NAF   point halving   Frobenius endomorphism  

摘要： In this paper we prove the optimality and other properties of the tau-adic nonadjacent form: this expansion has been introduced in order to compute scalar multiplications on Koblitz curves efficiently. We also refine and extend results about double expansions of scalars introduced by Avanzi, Ciet and Sica in order to improve scalar multiplications further. Our double expansions are optimal and their properties are carefully analysed. In particular, we provide first- and second-order terms for the expected weight, determine the variance and prove a central limit theorem. Transducers for all the involved expansions are provided, as well as automata accepting all expansions of minimal weight.

关键词： analytic fit   bimodal distribution   estrogen   gamma distribution   exploratory behavior  

摘要： We investigated the effects of beta-estradiol on the locomotor behavior of female mice in a radial maze. Data comprising the total distance traveled during each arm entry were obtained from video records of six consecutive daily recording sessions. Distributions of these data were bimodal for both ovariectomized control and beta-estradiol-treated ovariectomized subjects. Data were fit with the sum of two gamma probability distributions. Three parameters of the analytic fits were useful for quantifying the effect of beta-estradiol on locomotor behavior: (i) the sampling distance (median of the total distance traveled during each arm entry in the short-distance peak of a bimodal distribution), (h) the committed distance (median of the total per-arm-entry distance traveled in the long-distance peak), and (iii) the partition distance (distance represented by the minimum between the two peaks). Analysis showed that for sampling-distance arm entries beta-estradiol typically had little if any significant effect on female locomotor behavior, whereas it significantly increased the total distance traveled during committed-distance arm entries on the first 2 days of exposure to the empty maze. beta-Estradiol also increased the ability of females to discriminate between empty maze arms and arms that contained intact or castrated male mice and partially prevented loss of this capacity after removal of the males.