弹性有限长度杆在轴向应力波传播和反射过程中的屈曲

讨论弹性有限长度杆端部受冲击载荷作用，在轴向应为波传播和反射过程中的动态屈曲问题．利用扰动方程的解、端部支承条件和应力波反射前后波阵面相容条件得到了动态屈曲的分叉条件，临界载荷和屈曲模态．数值结果表明：临界载荷有多个分支且随时间增加而降低；由于应力波在端部的反射，使临界载荷进一步下降．这个结果就解释了实验中的一些现象．     

Fuzzy Comprehensive Assessment Method to Determine Tectonic Stress Patterns

The tectonic stress patterns were determined by a fuzzy comprehensive assessment method. Data of in-situ survey and fault information were utilized in the method. First, by making pressure and tension in the directions of along-river, cross-river, shear clockwise, and shear counterclockwise , 26 types of tectonic stress patterns were presented. And the stress vector of each pattern was obtained with FE software by taking unit displacement as boundary load. Then, by taking the 26 types of tectonic stress patterns as index set and 3 main stresses as factor set and choosing various operators, comparison of directions of computational stress vector and survey stress vector was made and the most possible tectonic stress pattern was obtained. Taking the 26 types of tectonic stress patterns as index set and strike angle as factor set, comparison of relationships between formation of fault and tectonic stress was made,and the tectonic stress patterns were assessed with known fault information. By summarizing the above assessment results, the most impossible tectonic stress pattern was obtained . Finally an engineering case was quoted to validate that the method is more feasible and reliable than traditional empirical method.     

浅析复杂材料的提取练习效应

提取练习效应具体指学习某一内容后,进行测试比再次学习的记忆保持效果更好,即使测试后没有反馈也依然存在。研究发现对词语、篇章及技能等类型的学习都存在提取练习效应。但近年来一些研究发现复杂材料不存在提取练习效应。本文综述了有关复杂材料不存在提取练习效应的实验,并讨论了复杂材料没有出现提取练习效应的内部原因。     

Learning styles in engineering education: the quest to improve didactic practices

This article discusses a dilemma that engineering educators encounter when attempting to develop pedagogical methods: that of finding efficient and scientifically valid didactic practices. The multitude of methods offered by educational consultants is perplexing. Moreover, the popularity of commercially offered solutions such as learning styles testing makes them appear attractive. The study presents one case of application of learning styles, the consequent problems and evaluation of results. It concludes that the use of learning styles is not supported by current pedagogical theories. Practices to foster interdisciplinary understanding between learning sciences and engineering are proposed in order to improve engineering education, most notably collaborative projects between university departments.     

渐开线圆柱齿轮精度的计算机辅助设计

该文介绍渐开线圆柱齿轮精度的计算机辅助设计及计算的有关问题，对提高齿轮精度设计的准确度及其合理性有一定的实际指导意义。     

幼儿教师工作压力与生活满意度的关联性研究

摘要:采用问卷调查法对511名幼儿教师进行调查,考察幼儿教师工作压力与生活满意度之间的关联,探讨心理资本和工作倦怠在其中的序列中介效应。结果表明:（1）幼儿教师工作压力、心理资本、工作倦怠、生活满意度两两显著相关;（2）幼儿教师工作压力对生活满意度的直接预测作用不显著,但分别通过心理资本、工作倦怠的独立中介作用以及二者的序列中介作用间接预测生活满意度。研究结果提示不仅要重视缓解幼儿教师的工作压力,降低工作倦怠,还要从提升幼儿教师心理资本、发挥个体资源的保护性作用等途径缓解工作压力对幼儿教师生活满意度的不利影响。     

仿生种植牙应力分布的有限元分析

以上颌中切牙为解剖学基础 ,提出了仿生种植牙模型。相同载荷分别作用于天然牙、仿生牙及骨性结合种植牙模型 ,用二维有限元法计算得到牙周膜和仿生牙周膜的应力分布 ,对三种模型骨界面上的应力分布进行了比较研究     

An international comparison using a diagnostic testing model: Turkish students’ profile of mathematical skills on TIMSS-R

This study illustrates how a diagnostic testing model can be used to make detailed comparisons between student populations participating in international assessments. The performance of Turkish students on the TIMSS-R mathematics test was reanalyzed with a diagnostic testing model called the Rule Space Model. First, mathematical and cognitive skills (‘attributes’) measured by the test were determined. One hundred sixty-two items were coded in terms of their attribute involvement, creating an incidence matrix—the Q-matrix. Using the Q-matrix and the student response data, each student’s attribute mastery profile was determined. Mean attribute mastery levels of Turkish students were computed and compared to those of their American peers. It was shown that Turkish students were weak in algebra and probability/statistics. They also demonstrated poor profiles in skills such as applying rules in algebra, approximation/estimation, solving open-ended problems, recognizing patterns and relationships, and quantitative reading.

英语语言测试的批判理论分析

本文根据批判理论的观点对英语测试,特别是美国TOEFL和英国IELTS进行了历史回顾和现状分析,结果表明:影响英语测试的因素除语言学、语言教学和语言测试理论外,也受到社会政治和经济因素的制约。国外外语测试都是在一定的历史背景下发展起来的,都有其特定的历史条件和社会需求。     

从语言测试学角度分析CET写作能力实质

在目前广大师生对于大学英语作文部分的要求和评分体系缺乏清楚认识的前提下,本文从语言测试学的角度展示CET作文的基本要求和大学英语写作能力的实质及构成要素,对于大学英语写作教学尤其是作文的整体质量的提高有积极的推动作用。