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   

幼儿教师工作压力与生活满意度的关联性研究          下载免费PDF全文

许颖 《宁波大学学报(教育科学版)》2020,(6):117-122

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。  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   

国家生命周期与中国崛起   总被引：8，自引：0，他引：8  

胡鞍钢 《教学与研究》2006,11(1):7-17

本文借鉴产品生命周期理论,提出国家生命周期理论,并对几个大国崛起的历程进行比较分析。本文认为,从世界现代经济发展历史看,的确存在国家发展生命周期,大体有四个或五个阶段。一个国家的兴起可能是由于国家之间竞争,从被动响应到主动响应,从模仿创新到主动创新;反之,一个国家的衰落可能是由于国家之间竞争,创新能力减弱,甚至消逝。这一国家发展生命周期理论,既可以解释其他国家的发展历史轨迹,也可以解释中国发展的历史轨迹;既可以解释中国为何从强大到衰落,也可以解释为什么中国从衰落再到强大。作者指出,国家生命周期的决定性因素就是能否创新,能否持续创新、不断创新和鼓励创新是国家崛起的背后动因。  相似文献   

一类广义Liénard型方程的极限环     

杨启贵 《蒙自师范高等专科学校学报》1995,(4)

本文讨论广义Lienard系统(E):x+(f(x)+k(x)x)+g(x)=0,获得了系统(E)的极限环存在,至多有一个或两个的充分条件.这些条件不仅简单和易于验证,而且推广了〔5,6〕的结果.  相似文献   

谐振子量子制冷循环性能的优化分析   总被引：1，自引：0，他引：1  

林比宏 《泉州师范学院学报》2005,23(6):27-33

基于量子主方程和半群逼近研究以谐振子系统为工质，由两个等温和两个等谐振子数过程组成的不可逆谐振子量子制冷循环的一般性能特性，导出了制冷循环的制冷系数、制冷率、输入功和熵产率等重要参数的一般表达式．并详细讨论了高温极限下谐振子量子制冷循环的优化性能，导出了最大制冷率和相应的制冷系数．所得结论可为非常规工质低温制冷循环的优化设计提供理论基础．  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   

一类两种群食饵-捕食者模型的定性分析     

黄优良 《钦州学院学报》2007,22(3):20-22

具功能性反应的两种群食饵-捕食者模型：＆=xg（x）-yφ（x）,＆=y（-d＋eφ（x））当食饵种群的相对增长率g（x）与捕食者种群的捕食率φ（x）都是非线性的情况,运用微分方程稳定性理论和Poincaré-Bend ixon环域定理,探讨了系统平衡点的稳定性,给出系统极限环存在的充分条件.  相似文献   

论英语节奏     

王守芳 《临沂师范学院学报》2001,23(2):118-120

阐述了英语节奏的特点，论述了英语节奏与词重音、句重音、重音规整性，音长、元音的音质、语调和语言的可理解性三者之间的相互关系和影响。提出了掌握英语节奏的正确方法。  相似文献   

一类KOLMOGOROV系统的极限环     

李小燕  顾道修 《湖南师范大学教育科学学报》1997,(2)

本文研究了一类kolmogorov生态系统，证明了有关它的极限环的存在性与唯一性的若干定理．  相似文献