EBH315型掘进机的虚拟建模

本文介绍了CAXA三维实体设计软件在EBH315掘进机设计中的应用,以EBH315掘进机截割减速器为例,着重介绍了CAXA三维实体设计软件的零件建模和虚拟装配功能。     

The relationships between stress,health, and physically active leisure as a function of life‐cycle

This article examines relationships between stress, health, and participation in physically active leisure using data collected as part of the 1985 and 1990 U.S. National Health Interview Surveys (NHIS). In particular, the article analyzes: (a) the effects of life‐cycle progression (controlled for gender) on subjectively perceived stress and self‐reported health; (b) the role of physically active leisure in enhancing health or buffering adverse health outcomes of stress; and (c) the effects of selected social‐economic factors, such as education and income, on the relationships between life‐cycle, stress, health, and physically active leisure. According to our analyses: (1) stress is unevenly distributed across the life span; (2) stress‐reducing effects of physically active leisure are present among retired older people more so than in the middle‐aged life‐cycle groups; and (3) direct health‐enhancing effects of participation in physically active leisure are more evident than the buffering effects of leisure on stress‐health relationships. A critical discussion of methodological and substantive issues facing researchers interested in the relationships between leisure, stress, and health is provided.     

基于IAPWS-IF97的水和水蒸气热力性质计算在智能手机中的应用

智能手机的普及使我们的生活发生了重大的改变,而另一方面,在工业应用中仍然使用老方法来查找水蒸气的性质。文章介绍了如何将基于IAPWS-IF97的水蒸气性质计算软件移植至手机平台及其应用。     

Recreation and Leisure Research from an Active Living Perspective: Taking a Second Look at Urban Trail Use Data

This paper examines recreation and leisure research within the context of active living, and highlights an apparent gap between the current involvement of recreation and leisure researchers and the potential they could offer to this important and expanding area of inquiry. To illustrate this potential, I looked at two previous studies that focused on the recreational use of urban trails and reanalyzed the data from an active living perspective. In Study 1, individual, social and environmental factors helped distinguish between low, moderate, and high activity level trail uses. In Study 2, use patterns helped distinguish between health-motivated trail users and individuals using trails for recreation and other purposes, but perceptual and demographic data were similar among groups. Findings from similar studies can help inform active living research, and recreation and leisure studies can provide leadership and contributions to a transdisciplinary understanding of active living.     

延安大学非体育专业学生课余体育锻炼的调查与分析

通过实际的调查研究、问卷调查、查阅资料等方式,结合学生的实际,对延安大学非体育类专业的部分学生进行研究,并对问卷进行分析。结果表明,大部分学生比较喜欢参加课余体育锻炼,可是由于各种原因不能持续参与的占相当大的比例。针对出现的问题进行分析,提出可行性的意见和建议,以便对大学课余体育锻炼有所帮助。     

陕西省农村中小学体育师资队伍现状调查

笔者针对陕西省农村中小学体育师资队伍现状进行了调查研究,结果表明:陕西农村中小学专职体育教师数量不足,教师学历结构偏低,年龄结构有待于优化,体育教师工作量相对较大,随着教师待遇的提高师资流失情况有所好转。并在此基础上提出加快陕西农村中小学体育师资队伍建设的对策。     

集装袋老化力学性能试验研究及其灰色预测

考虑粮食集装袋不同的使用环境，通过老化试验对集装袋的老化行为进行研究，探讨了自然暴露和不同温度条件对集装袋性能的影响。结果表明，随着老化时间的增加，集装袋基布的抗拉强度、断裂伸长率下降。自然暴露对基材性能的影响最为显著，高温环境下次之，低温环境下最不显著。基布的抗老化性能与气候条件的变化密切相关，随着温度的升高、光照强度增强，基布老化加剧。同时，基于灰色预测理论，对集装袋横向基布自然老化力学性能进行预测，预测结果精度较高。     

铁路项目经营性评价和投资分类管理研究

论文分析铁路设施项目的一般特点，运用相关基础理论，建立项目可经营性评价体系和模型，对项目的可经营性程度进行定量分析，提出经营性视角下铁路项目区分和投资分类管理方法，科学界定政府和市场的投资职责。最后应用研究的理论成果，对部分铁路设施项目进行了分析。     

公允价值计量属性探析

如何将公允价值理论很好地运用于实践,并有效地指导实践是公允价值研究的重点和难点。现就新准则中公允价值的计量属性进行探讨。     

女子三级跳远运动员身体素质训练方法的探讨

结合实际训练总结女子三级跳远运动员身体素质训练方法:改进跑的技术;提高连续的快速收缩能力;提高跑的能力;提高基础力量与专项力量;重视柔韧、协调能力的训练。