Curvatures estimation on triangular mesh

Curvatures are important geometric attributes of surfaces. There are many applications that require as a first step the accurate estimation of curvatures at arbitrary vertices on a triangulated surface. Chen and Schmitt (1992) and Taubin (1995)presented two simple methods to estimate principal curvatures. They used circular arcs to approximate the normal curvature. We find this may cause large error in some cases. In this paper, we describe a more accurate method to estimate the normal curvature,and present a novel algorithm to estimate principal curvatures by simplifying the Chen and Schmitt's method. Some comparison results are also shown in this paper.     

深化实验教学改革 提高学生综合素质

介绍了机能综合实验室的设备配置和运行方式，以及建立实验教学新体系和提高学生综合素质的做法。     

城镇土地生态景观类型划分的指标体系研究

根据景观生态学的基本原理,采用AHP方法,系统研究了城镇土地生态景观(包括城区和城乡交错带)类型划分的指标体系问题,建立了基于FOXPRO和MAPGIS平台的城镇土地生态景观类型划分指标体系数据库。     

Chinese and Canadian Children's Evaluations of Lying and Truth Telling: Similarities and Dfferences in the Context of pro-and Antisocial Behaviors

The present study compared Chinese and Canadian children's moral evaluations of lie and truth telling in situations involving pro- and antisocial behaviors. Seven-, 9-, and 11-year-old Chinese and canadian children were presented 4 brief stories. Two stories involved a child who intentionally carried out a good deed, and the other2 stories involved a child who intentionally carried out a bad deed. When story characters were questioned by a teacher as to who had committed the deed, they either lied or told the truth. Children were asked to evaluate the story characters' deeds and their verbal statements. Overall, Chinese children rated truth telling less positively and lie telling more positively in prosocial settings than Canadian children, indicating that the emphasis on self-effacement and modesty in Chinese culture overrides Chinese children's evaluations of lying in some situations. Both Chinese and canadian children rated trugh telling positively and lie telling negatively in antisocial situations, reflecting the emphasis in both cultures on the distinction between misdeed and truth/lie telling. The findings of the present study suggest that, in the realm of lying and truth telling, a close relation between sociocultural practices and moral judgment exists. Specific social and cultural norms have an impact on children's developing moral judgments, which in turn, are modified by age and experience in a particular culture.     

洪堡的大学思想及德国大学模式向现代化的转化

在洪堡学术自由、教学与科研相结合的大学理想指导下 ,德国建立了被称为现代大学的柏林大学。以柏林大学为代表的研究性文理大学和工科大学促进了德意志民族的振兴 ,同时也实现了德国大学向现代化模式的转化     

抽象函数的一致强可导性问题

文中指出从区域G包括于K(K是数域)到Banach空间内的抽象函数x(t)的强一致连续性、强(弱)可导性及一致强(弱)可导性、强囿变之间的关系，并且给出一致强可导的条件。     

一种古老的生物信息分子--褪黑素

褪黑素是一种古老的生物信息分子，在动物体内具有控制生物节律、提高机体免疫力、清除自由基、抗多种细胞增殖、抑制性成熟等多种生物学作用．     

斜盘式轴向柱塞泵滑靴的设计计算

分析了斜盘式轴向柱塞泵的关键摩擦副零件滑靴的受力,导出了压紧力和分离力的计算公式;介绍了滑靴设计方法中的剩余压紧力法,包括零件材料、压紧力系数的选择以及滑靴关键几何参数的确定。     

关于“沙子的开采”的评注

从评阅者的角度对求解这道题目中值得注意的问题作了阐述，指出了学生的解答中好的作法及不足之处。     

青海藏族服饰成因的初步探讨

藏族是中华民族大家庭中历史悠久、文化灿烂、民族特点显著的一族。服饰艺术是民族特点的重要反映，是一个民族集体智慧、审美意识和审美情趣的集中体现。重要的是任何一个民族其服饰的形成与传承，都与自然环境和其特定的生存条件息息相关。