Transient Responses of Flexible Non—uniform Spinning Shaft with Nonlinear and Asymmetric Supports     

ZHUHuai－liang 《上海大学学报(英文版)》2001,5(1):35-39

In this paper ,a hybrid approach was developed to investigate the transient responses of a multi-span non-uniform flexble spinning shaft with nonlinear and asymmetric supports.The non-uniform spinning shaft with variable parmeters was modeled as a Bernoulli-Euler beam column with sectional constant cross-section properties by the finite element method.The supporting stiffness behavior of the nonlinear supports was described as a piecewise-linear and asymmetric model.The equations of motion in the matrix form of a multi-span non-uniform spinning shaft with nonlinear and asymmetric supports were formulated using Hamilton‘s principle and the assumed mode method.As an example,a spinning rocket with many variable stiffness supports was numerically simulated by the direct integration method.The transient response and dynamic behavior of this rotate-dynamic system are analyzed.  相似文献   

农村经济发展中的金融缺失与金融扶持   总被引：5，自引：0，他引：5  

姚遂  朱松青 《华中科技大学学报(社会科学版)》2003,17(2):30-34

章以农村金融结构为研究对象，分析了目前农村中广泛存在的资金短缺现象及其形成机理。章认为：其一，国家实行的倾向性的发展战略是造成农村金融资源缺乏，金融扶持水平低下的基要因素；其二，始于20世纪80年代中期以来的地方政府与国家在金融资源上的恶性竞争则是加剧了这一现象的罪魁祸首。因此，要改变这一现象，就需要在国家发展战略的重新定位与寻求现行农村金融体制突破两方面着手。  相似文献   

用拉压不同模量理论计算支座移动引起的超静定结构内力     

姚文娟  叶志明 《上海大学学报(英文版)》2004,8(3)

For statically indeterminate structure, the internal force will be changed with the translation of the supports, because the internal force is related to the absolute value of the stiffness EI. When the tension is different with the compression modulus, EI is the function of internal force and is not constant any more that is different from classic mechanics. In the other words, it is a nonlinear problem to calculate the internal force. The expression for neutral axis of the statically indeterminate structure was derived in the paper. The iterative program for nonlinear internal force was compiled. One case study was presented to illustrate the difference between the results using the different modulus theory and the single modulus theory as in classical mechanics. Finally, some reasonable suggestions were made for the different modulus structures.  相似文献   

The Role of Parents and Community in the Education of the Japanese Child     

Heidi?KnipprathEmail author 《Educational Research for Policy and Practice》2004,3(2):95-107

In Japan, there has been an increased concern about family and community participation in the childs education. Traditionally, the role of parents and community in Japan has been one of support and less one of active involvement in school learning. Since the government commenced education reforms in the last quarter of the 20th century, a more active role for parents and the community in education has been encouraged. These reforms have been inspired by the need to tackle various problems that had arisen, such as the perceived harmful elements of societys preoccupation with academic achievement and the problematic behavior of young people. In this paper, the following issues are examined: (1) education policy and reform measures with regard to parent and community involvement in the childs education; (2) the state of parent and community involvement at the eve of the 20th century.  相似文献   

大力扶持中小企业发展,保持经济生态平衡     

王仁秀 《青岛职业技术学院学报》2001,14(1):16-18

经济生态平衡离不开中小企业 ,要充分认识中小企业在市场经济中的作用 ,在搞好大型国有企业的同时 ,大力支持和发展中小企业 ,使企业的各种类型、成份保持动态和谐的比例关系 ,互为条件 ,互相依存 ,各得其所 ,维持和保护经济生态平衡的自然秩序  相似文献   

凸合作对策经典解的一特殊性质     

王振吉  刘微  李靖  封梅 《唐山师范学院学报》2007,29(5):63-65

将凸合作对策的性质与其经典解核心联系起来,从而得到凸合作对策核心的一特殊性质:即若凸合作对策可以分解成两个凸对策差的形式,则它的核心可以分解成两个凸对策核心的Minkowski差。  相似文献   

Peer facilitated writing groups: a programmatic approach to doctoral student writing     

Vijay Kumar  Claire Aitchison 《Teaching in Higher Education》2018,23(3):360-373

Very few empirical studies have investigated programmes in which doctoral students act as peer facilitators in faculty writing groups. We report on the development of a centrally delivered doctoral student writing programme in which twenty student participants were mentored and provided with the resources to initiate their own faculty-based doctoral writing groups. ‘Legitimate peripheral participation’ was used as a conceptual lens to interpret the data collected during the establishment and evaluation of the programme. All student participants in the preparatory training course, which was developed in consultation with postgraduate students and research supervisors, went on to become doctoral writing peer facilitators of peer writing groups. Insights from seven of these showed how a well-structured and supportive programme harnessed the benefits of peer learning by bringing personal rewards to participants and building institutional capacity around doctoral research writing literacies.  相似文献   

Breaking the tyranny of office hours: Overcoming professor avoidance     

Elizabeth K. Briody  Angela Goldenstein  Edward J. Berger 《European Journal of Engineering Education》2019,44(5):666-687

ABSTRACT

Studies have found that Faculty–Student Interaction (FSI) has many positive benefits for students including academic support, professional development, mentoring, and career planning. Research-intensive universities exhibit the lowest levels of faculty–student interaction within higher education. This article utilises qualitative methods to explore faculty, student, and staff perceptions of faculty–student interactions, particularly those that take place out of the classroom, at a research-intensive public U.S. university. We identify social distance between faculty and students based on unequal status within a rigid, hierarchically-organised culture as a key barrier to FSI. We then discuss methods that some of the faculty in our study used to mitigate their social distance with students in an effort to increase FSI.  相似文献   

远程教育学习支持服务满意度调查分析   总被引：1，自引：0，他引：1  

章玳  徐正东 《中国远程教育(综合版)》2011,(4)

远程教育机构关注的焦点在于学生的学。本研究把学习者的满意度作为学习支持服务的衡量标尺,从服务对象出发,展开学习支持服务满意度调查。结果表明,学习者对学习支持服务总体上呈现出比较满意的状态。专业对学生满意度影响较为显著;就地域来看,苏北、苏南区域差异变得不甚明显。研究者认为,必须根据学习者的需求,针对学习支持服务中存在的问题,更新理念,投入更多的人力与物力,为建设开放大学打下坚实基础。  相似文献   

低碳经济与水能资源开发     

王丽君  鲍文  马腾 《石家庄职业技术学院学报》2011,23(1):78-80

水能资源作为中国发展低碳经济突出的优势资源之一,其开发需要国家的政策支持：出台支持水能资源开发的具体政策,改变对水电的不公正待遇,建立和实施环境税制度,建立移民分享工程收益机制。  相似文献