Five-A venue Area： Colonial Buildings of Tianjin （III）

<正>Most buildings in the Five-Avenue Area are properties of state ownership while there are still some owned by social sectors, churches and individuals. Up to ...     

基于径向基函数、区间分析和非支配排序遗传算法的结构区间多目标优化

研究目的：为改善实际工程结构在不确定性条件下的多性能指标,提供一种高效的区间多目标优化方法。创新要点：建立一个目标和约束均为区间不确定性参数函数的区间约束多目标优化模型,提出并实现基于径向基函数、区间分析和非支配排序遗传算法（NSGA-II）的区间多目标优化算法。研究方法：首先,利用区间序关系将每个区间目标转换为同时优化其中点和半径的确定性双目标,利用区间可能度法将区间约束转换为确定性约束,并在此基础上,利用加权法和罚函数法将每个区间目标的约束优化问题转换为相应的无约束优化问题;然后,利用拉丁超立方实验设计和有限元分析构建预测各待优化结构性能指标值的径向基函数;最后,将径向基函数、区间分析法与NSGA-II相结合,快速求出转换后确定性无约束多目标优化问题的所有Pareto最优解,并通过考虑材料不确定性的高速压力机滑块机构设计实例验证该方法的有效性。重要结论：目标和约束均为不确定性参数函数的区间多目标优化模型能有效反映实际工程中同时改善结构多性能指标的需求。基于径向基函数、区间分析和NSGA-II相结合的区间多目标优化算法将传统区间优化模型求解中的嵌套优化过程简化为单层遗传优化过程,大大提高了求解效率,并可获得多目标优化问题的所有Pareto最优解。     

油气勘探开发论文题名英译常见谬误简析

根据对<石油勘探与开发>近千篇论文英文摘要的编校实践,列举出油气勘探开发论文题名英译出现的一些问题,并进行简析.     

A Comparative Study of Pre-Service Teachers’ Views on Ethical Issues in Classroom Assessment in China and the United States

The purpose of this study was to compare pre-service teachers’ views of ethical issues in assessment practices in the US and China. Focus group interviews were conducted among 16 pre-service teachers from the US and 15 pre-service teachers from China. Results indicated that the inclusion of effort in grading is a key issue for the pre-service teachers in both the US and China. American pre-service teachers have more consistent views with experts regarding using multiple assessment methods and communications about grading. Pre-service teachers in both countries appeared to have consistent views with experts regarding the confidentiality and standardized test preparation. The findings of this study can help build guidelines regarding ethical issues in classroom assessment.     

Meshless simulation for skeleton driven elastic deformation

INTRODUCTION Physical simulation is an important area for creating realistic character animations. In the film industry, animators require detailed control of the motion of their characters. Many techniques have been developed for automatically simulating charac- ters’ motion. The skeleton driven elastic deformation is paid much attention in these techniques, since many motions and deformations in character animations are mainly driven by skeleton. In general, however, it is not easy to …     

On self-recovery mechanism and additional maneuverability of a mini mobile robot

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ａｕｔｏｎｏｍｏｕｓｍｏｂｉｌｅｒｏｂｏｔｓｗｉｔｈｌｅｇｓｏｒｗｈｅｅｌｓｗｏｒｋｉｎｇｉｎｈａｚａｒｄｅｎｖｉｒｏｎｍｅｎｔｓｏｒｏｎｒｏｕｇｈｔｅｒｒａｉｎｗｉｌｌｆａｃｅｔｈｅｐｏｓｓｉｂｉｌｉｔｙｏｆｂｅｉｎｇｔｕｒｎｅｄｏｖｅｒｂｙｕｎｅｘｐｅｃｔｅｄｒｅａｃｔｉｏｎｂｅｔｗｅｅｎｔｈｅｒｏｂｏｔａｎｄｔｈｅｅｎｖｉｒｏｎｍｅｎｔ．Ｔｙｐｉｃａｌｅｘａｍｐｌｅｓａｒｅｖｏｌｃａｎｏｅｘｐｌｏｒａｔｉｏｎｒｏｂｏｔｓ,ｌｕｎａｒｏｒＭａｒｓｒｏｖｅｒｓ…     

儿童画教学的理性思考

一、培养学生对生活的理解和情感 美术课的首要任务是培养学生观察生活的能力和习惯,让学生在观察生活中,体验和创造生活中的美。对于孩子来说,一天的活动,喜怒哀乐的情绪起伏都是生活。教师应该明确,创作的源泉就在小画家的生活中,学生用眼睛审视生活是第一位的,当不同时间、不同外