平面问题主应力与主应变方向确定的简捷方法

平面应力和平面应变状态下主应力和主应变方向的确定,无论是在工程应用还是在材料力学教学中都是非常重要的难点。本文提出了一种既易于理解又便于掌握的简捷实用方法。     

高中生生活压力、应对方式对其心理健康的影响

文章探讨了高中生生活压力与应对方式对其心理健康的影响。采用高中生生活压力问卷、高中生应对方式问卷和中学生心理健康量表对807名高中生进行了调查,运用典型相关和逐步多元回归分析的方法处理。结果发现,高中生生活压力、应对方式与心理健康之间有显著的典型相关;高中生生活压力与应对方式对其心理健康水平具有联合预测的功能;其中,主观生活压力中的同伴关系压力和应对方式中的内部消极评价具有最大的预测力;生活压力与应对方式中有11个变量能共同解释高中生整体心理健康水平63.9%的变异量。     

高中阶段教师职业枯竭的多层研究

通过对29所高中阶段学校763名教师的问卷调查,探讨了教师个体水平变量和集体水平变量对教师职业枯竭的预测作用.多层分析结果表明:(1)教师教学效能、应对效能和工作压力分别对职业枯竭具有显著预测作用,且存在学校间差异;(2)学校水平的集体效能变量能显著正向预期工作压力与情绪衰竭、工作压力与非人性化、应对效能和知识枯竭以及应对效能与个人成就感之间的关系.     

地震灾区儿童心理创伤及其干预策略

5·12大地震,使灾区儿童在重建家园的同时,亦需重视心灵重建。本文介绍了创伤、心理创伤与创伤后应激障碍的概念,创伤后应激障碍的测量及各种干预策略,以期为灾区儿童健康心理素质的重塑提供方法上的指导。     

Stress and psychological distress among trainee secondary teachers in England

The relationships between stress and psychological distress were investigated among a cohort of trainee secondary school teachers in England. Specifically, the study examined the structure of a Teacher Stress Scale and its relationship to mental health as measured by the 12‐item General Health Questionnaire. Three factors were identified: behaviour management, workload, and lack of support. Differences were identified between men and women in respect of stressors and psychological distress. Stress attributed to pupils’ disruptive behaviour and stress attributed to perceived occupational stress were found to be significant predictors of psychological distress. The findings are discussed in relation to the degree to which trainees are prepared for the challenges they are likely to experience as teachers.     

School climate factors relating to teacher burnout: A mediator model

The present study investigated components of school climate (i.e. parent/community relations, administration, student behavioral values) and assessed their influence on the core burnout dimensions of Emotional Exhaustion, Depersonalization, and feelings of low Personal Accomplishment. The study weighed the relative contributions of demographic factors (i.e. gender, age, years of teaching experience), teacher satisfaction, and teacher-rated school climate that predict resultant levels of teacher stress and burnout from 17 rural schools in southeastern Ohio. Results revealed that different aspects of school climate related to each of the three primary burnout dimensions. Further, the inverse relationship between school climate and burnout was mediated by teacher satisfaction levels for both Emotional Exhaustion and Depersonalization dimensions. Results from the present study may be used in the development of future intervention targets for reducing teacher stress and burnout.     

重商求利：皖江地区传统农耕文化的近代嬗变

传统的皖江地区农耕文化表现为安土重迁、勤力农亩的特征。近代前后,伴随着对外交流的加强和市场的刺激因素,皖江地区农耕文化开始呈现出明显的重商求利的特征,实现了由安土重迁向出外谋利、由因循守旧向迎合市场的转变。     

独立同分布R-S(t)串并联系统的结构可靠度

通过定义两种类型的指数分布，运用实用分析法的思想，提出四种系统的当量指数方法，获得四种R—S(t)串并联系统的结构可靠度，证明了四系统可靠度都是K=μR/μS的函数，分别得到了在不同的情况时四类系统可靠度的结论，而且近似地获得显示的可靠性设计表达式，最后用事例给予了证实。     

复合维生素添加剂对高温期淮北麻鸡生产性能和免疫功能的影响

目的:研究饲粮中添加不同水平的复合维生素添加剂对淮北麻鸡生产性能和免疫功能的影响及其相关性。方法:选取480只28周龄淮北麻鸡,随机分为4组,每组3个重复,每个重复40只鸡,饲喂在基础日粮分别添加复合维生素添加剂0(Ⅰ组,对照组)、100 mg/kg(Ⅱ组)、500 mg/kg(Ⅲ组)、1000 mg/kg(Ⅳ组),预试期2周,正试期8周。结果:与对照组比较,1)Ⅲ、Ⅳ组产蛋率比显著提高(P0.05),料蛋比显著降低(P0.05),蛋的受精率、孵化率及出雏率显著提高(P0.05);而Ⅱ组产蛋率、料蛋比、蛋孵化率和出雏率的变化不显著(P0.05);2)Ⅲ、Ⅳ组中血清免疫球蛋白A(Ig A)、免疫球蛋白M(Ig M)和补体C4含量显著提高(P0.05);而Ⅱ组中以上指标含量变化不显著(P0.05);3)Ⅲ、Ⅳ组血清超氧化物歧化酶活性和血清谷胱甘肽过氧化物酶活性及总抗氧化能力明显提高(P0.05),而Ⅱ组变化不明显(P0.05)。结论:饲粮中添加500~1000 mg/kg复合维生素添加剂能提高热应激条件下淮北麻鸡的生产性能、抗氧化能力和免疫功能。     

高斯模式在煤台煤粉尘排放强度测算中的应用

高斯模式是高架孤立点源的经典计算模式,经修正可应用于煤粉尘排放强度的测算中