智能仪表在直梁弯曲正应力实验中的应用     

李英 《北京工业职业技术学院学报》2006,5(3):73-75

通过对材料力学直梁弯曲正应力实验的介绍,分析了所用三种测试仪器的特点,重点介绍了智能仪表在该实验中的应用,说明了智能仪表的应用使实验技术发生了巨大变革.  相似文献   

融合教育教师职业压力对职业倦怠的影响:社会支持的中介作用     

谢正立  邓猛  李玉影  林开仪  王红霞 《中国特殊教育》2021,(3):46-52

本研究旨在考察融合教育教师职业压力、社会支持和职业倦怠之间的关系,采用问卷调查法对来自北京市、厦门市、中山市的367名融合教育教师进行调查。结果发现:融合教育教师的职业压力显著影响教师的职业倦怠;融合教育教师获得的社会支持显著影响其职业倦怠。融合教育教师的社会支持在职业压力与职业倦怠关系中发挥部分中介作用,即融合教育教师的职业压力既直接影响其职业倦怠又通过社会支持间接影响职业倦怠。  相似文献   

Attention‐Deficit/Hyperactivity Disorder Symptoms,Perceived Stress,and Resilience in College Students     

Stacey L. Hamilton  Amanda Baraldi  Shelia M. Kennison 《Journal of College Counseling》2021,24(1):49-62

This research investigated the relationships among symptoms associated with attention‐deficit/hyperactivity disorder (ADHD), perceived stress, and resilience in college students. In our study of 558 college students (175 men, 383 women), we confirmed the hypothesis that the relationship between ADHD symptoms and perceived stress is mediated by protective factors associated with resilience. The relationships were not significantly moderated by sex. Implications for increasing resilience in college students and lowering perceived stress for college students are discussed.  相似文献   

发动机连杆热-结构耦合性能分析及优化          下载免费PDF全文

李晓婧  张颖博  高欣 《唐山学院学报》2021,34(6):23-27

为改善发动机连杆在热-结构耦合作用下的性能,首先,应用理论分析法分析了发动机曲柄连杆机构的运动学特性;然后,采用有限元仿真法分析了连杆在热-结构耦合作用下的拉应力、压应力以及疲劳寿命;最后,依据仿真分析结果对原型连杆的危险截面进行优化设计并再次分析,结果表明,优化后的发动机连杆其应力得到大幅减小,但疲劳寿命增加了96.60%,连杆性能得到了很好的改善。  相似文献   

仿生种植牙应力分布的有限元分析     

王宗篪  庄国铭  赖森财  谢培庆  黄庆杰  黄跃 《三明学院学报》2002,19(4):1-3

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  相似文献   

Fuzzy Comprehensive Assessment Method to Determine Tectonic Stress Patterns     

张海  戚蓝  郝彩哲  郭磊 《天津大学学报(英文版)》2007,13(6):462-468

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.  相似文献   

Teacher self-efficacy moderates the relations between imposed pressure from imposed curriculum changes and teacher stress     

David W. Putwain  Nathaniel P. von der Embse 《教育心理学》2019,39(1):51-64

Based on the Job Demands-resources (RD-R) model, the aim of the current study was to examine how pressure arising from imposed curriculum changes and teacher self-efficacy relate to perceived stress in teachers. Participants (839 teachers working in English schools) completed an online survey that contained questions about demographics, self-reported pressure from imposed curriculum changes, teacher self-efficacy, and perceived stress. Pressure from imposed curriculum changes was positively, and teacher self-efficacy negatively, related to perceived stress. Teacher-self efficacy moderated relations between pressure from imposed curriculum changes and perceived stress. High teacher self-efficacy was associated with lower perceived stress, relative to low teacher self-efficacy, when pressure from imposed curriculum changes was low. The differential advantage offered by high self-efficacy declined as pressure from imposed curriculum changes increased.  相似文献   

圆柱滚子轴承的强度研究     

陈白生  曹学民 《洛阳工业高等专科学校学报》2006,16(3):23-24

依据赫兹接触强度计算理论,着重研究了圆柱滚子轴承内、外圈及滚动体的接触应力。结果表明,当内圈与滚动体运动到与轴承所受经向载荷方向重合时,内圈与滚动体之间的接触应力最大。  相似文献   

The dangers of relentless pursuit: teaching,personal health,and the symbolic/real violence of Teach For America     

Matthew A. M. Thomas  Elisabeth E. Lefebvre 《Discourse: Studies in the Cultural Politics of Education》2018,39(6):856-867

ABSTRACT

This paper examines the pressures experienced by teachers as they strive to embody the Teach For America (TFA) motif of ‘relentless pursuit’. It draws on interviews conducted with 36 teachers and uses a Bourdieuian analysis to consider the mechanisms of control manifested through socialization and corps member habituation. The findings suggest that corps members experience both symbolic and self-imposed overt violence as they aim to meet the demands of TFA. This has implications for the increasing number of teachers in programs around like TFA as well as the broader discourses of teacher accountability and the teaching profession.  相似文献   

Buckling of un-stiffened cylindrical shell under non-uniform axial conpressive stress     

宋昌永 《浙江大学学报(A卷英文版)》2002,3(5)

This paper provides a review of recent research advances and trends in the area of stability of un-stiffened circular cylindrical shells subjected to general non-uniform axial compressive stresses. Only the more important and interesting aspects of the research, judged from a personal viewpoint, are discussed. They can be crudely classified into four categories: (1) shells subjected to non-uniform loads; (2) shells on discrete supports; (3) shells with intended cutouts/holes; and (4) shells with non-uniform settlements.  相似文献