砌体结构墙下基础设计的对称修正

砌体结构墙下基础设计时一般按所承受的荷载值计算基础宽度，由于在基础相交处存在重叠问题，应适当调整基础底面尺寸。本文按基础底面压力的分布特点确定基础底面的对称修正范围，得到修正系数的计算公式，方法简捷、结果可靠，便于工程应用。     

Physical attractiveness and health: Comment on Weeden and Sabini (2005).

Evolutionary behavioral biology suggests that certain characteristics of the human face and body are important for mate preferences and are therefore subject to sexual selection. J. Weeden and J. Sabini (see record 2005-11504-001) identify a number of weaknesses in the association between traits' attractiveness and health. In contrast, the authors argue that (a) studies on preferences for physical characteristics that rely on 1 trait permit only limited interpretation, (b) limitations placed on J. Weeden and J. Sabini's review exclude important associations, (c) there are misconceptions in their treatment of some traits, and (d) their selected literature provides an inaccurate picture regarding effect size. The authors suggest that future research in this field should seek conceptual and methodological constancy in trait selection and in the evaluation of attractiveness- and health-related traits. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

对称性在微积分应用中的教学归纳

研究了微积分的对称性,给出了偏导数、定积分、曲线积分与曲面积分关于对称性的一系列定理,推广了文[1]～[3]的结论.这对于简化微积分计算,丰富微积分理论与教学具有重要意义.     

谈普通物理教学中创新能力的培养

如何培养具有创新精神的人才,这是新时期广大教师迫切需要研究的重要问题.本文对在大学普通物理教学实际中,怎样培养学生的创新能力的问题进行了一些探讨.     

平面曲线对称性的判定

平面曲线的对称性对于函数研究具有重要意义。本文给出了平面曲线轴对称与点对称的定义和判定定理，指出可以用类似求一元函数极值和拐点的办法判定曲线的对称轴和对称中心，从而平面曲线的对称性可以归结为导数应用问题。     

计算两参数对称音叉式分岐曲线扩张系统的构造

构造了计算两参数分岐线的扩张系统，讨论了扩张系统的正则性。     

Stochastic models for recognition of occluded targets

Recognition of occluded objects in synthetic aperture radar (SAR) images is a significant problem for automatic target recognition. Stochastic models provide some attractive features for pattern matching and recognition under partial occlusion and noise. In this paper, we present a hidden Markov modeling based approach for recognizing objects in SAR images. We identify the peculiar characteristics of SAR sensors and using these characteristics we develop feature based multiple models for a given SAR image of an object. The models exploiting the relative geometry of feature locations or the amplitude of SAR radar return are based on sequentialization of scattering centers extracted from SAR images. In order to improve performance we integrate these models synergistically using their probabilistic estimates for recognition of a particular target at a specific azimuth. Experimental results are presented using both synthetic and real SAR images.     

圆柱体质心测量中转角取值分析

为获得质量非均匀圆柱体质心的三维坐标，测量时需使圆柱体转过一定的角度。分析表明，转角最好取为90度以获得最佳测量效果。如果受条件限制，宜在45度到90度之间选取，尽量避免取小于30度的值。     

反铁畸变中钛酸锶(SrTiO3)晶体学原胞的选取

通过对钛酸锶（SrTiO3)在相变前后结构对称性的分析，提出了与之相应的两种晶体学原胞的选取方法。无论选取D4和D2d哪一种原胞，其对称元素个数均为8，即对称元素个数保持不变，只是所选原胞体积相差一倍。因此，在选取原胞时必须遵从以下两个原则：1）所选晶体学原胞的体积在相变前后要保持不变；2）所选取的晶体学原胞，应最能反映相变前后晶体结构对称性的变化，且其对称元素个数不因所选原胞体积的不同而变化。     

Hamilton系统的形式不变性和Lie对称性

研究Hamilton力学系统在相空间的形式不变性及与Lie对称性的关系．首先，给出了形式不变性和Lie对称性的定义和判据；然后导出形式不变性与Lie对称性的关系，给出形式不变性与Lie对称性的结构方程和守恒量，并举例说明结果的应用．