首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1781篇
  免费   13篇
  国内免费   4篇
教育   890篇
科学研究   654篇
各国文化   15篇
体育   84篇
综合类   1篇
文化理论   26篇
信息传播   128篇
  2020年   20篇
  2019年   29篇
  2018年   38篇
  2017年   34篇
  2016年   30篇
  2015年   17篇
  2014年   36篇
  2013年   313篇
  2012年   14篇
  2011年   29篇
  2010年   18篇
  2009年   20篇
  2008年   22篇
  2007年   17篇
  2006年   17篇
  2005年   26篇
  2004年   28篇
  2003年   21篇
  2002年   16篇
  2001年   22篇
  2000年   16篇
  1996年   20篇
  1995年   13篇
  1994年   17篇
  1993年   18篇
  1992年   14篇
  1991年   14篇
  1990年   20篇
  1989年   17篇
  1988年   13篇
  1986年   16篇
  1985年   16篇
  1984年   14篇
  1983年   17篇
  1981年   15篇
  1980年   13篇
  1978年   31篇
  1977年   13篇
  1930年   20篇
  1929年   28篇
  1928年   33篇
  1927年   32篇
  1926年   31篇
  1925年   52篇
  1924年   33篇
  1923年   34篇
  1921年   14篇
  1920年   28篇
  1919年   13篇
  1868年   15篇
排序方式: 共有1798条查询结果,搜索用时 15 毫秒
101.
Intellectual property protection mechanisms in research partnerships   总被引:1,自引:0,他引:1  
A set of US-based companies is investigated regarding the effectiveness of intellectual property protection mechanisms (IPPMs) in the formation of research partnerships. Patents are the most frequently used IPPM to protect both background and foreground knowledge in partnerships. Other IPPMs are used to protect know-how, especially in the early, forming stages of a partnership. Existing IP titles are quite useful when negotiating new partnerships. IPR negotiations are reported to be more complex in horizontal partnerships and when universities are involved.  相似文献   
102.
103.
104.
For a channel-shoal system in a funnel-shaped basin the impact of dredging and dumping is investigated using a complex process-based model. First, the residual flow and sediment transport circulations are analysed for the channel-shoal pattern, which has emerged after a long-term model simulation. Results are compared to the Western Scheldt estuary, which forms the inspiration for this study. Subsequently, different dredge and dump scenarios are modelled, according to a conceptual model, in which ebb-and flood-channels and enclosed shoals form morphodynamic units (cells) with their own sediment circulation. Model results show that dumping sediment in a channel further reduces the channel depth and induces erosion in the opposite channel, which enhances tilting of the cross-section of the cell and eventually can lead to the degeneration of a multiple channel system into a single channel. The impact of different dredging and dumping cases agrees with results from a stability analysis. This means that this type of model applied to a realistic geometry can potentially be used for better prediction of the impact of human interventions.  相似文献   
105.
106.
This article provides a pre- and post-Katrina snapshot of issues in the human resource arena with emphasis on resilience, persistence, and the overwhelming need for effective planning.  相似文献   
107.
Within modular degrees it is sometimes possible for students to broaden their education by taking modules from outside their main programme of study. This is one significant aspect of modular degrees which has not been studied. In an effort to better understand this issue, the research reported in this paper explored the experiences: (1) of students taking modules from outside their programme of study and; (2) of staff teaching modules with significant numbers of students from other programmes. In total, 820 undergraduate students responded to an on-line survey; 12 academic staff members participated in interviews. The survey focused on students’ reasons for choosing the module, their experiences of assessment and their perceptions of workload. Interviews with academic staff focused on the influence of non-programme students on teaching and assessment practices. The discussion addresses the implications of student choice and classroom diversity for teaching and assessment in modular systems.  相似文献   
108.
Evaluation of college and university teaching is considered in the context of growing demands for accountability of educational institutions and particular roles of faculty in achieving goals for which these institutions are believed to be accountable. In the first of two papers,* three contemporary aprroaches to evaluation of teaching in higher education are critically reviewed. All three of these approaches-assessment of learning outcomes, assessment of teacher characteristics and analysis of pedagogical behaviors-are found to be defective on logical, theoretical and empirical grounds. A common thread of deficiency is the absence of a coherent theoretical framework for analysis of teaching and phenomena associated with teaching. Specific defecs are analyzed in each of the three approaches as well as in the ubiquitous methodology of rating of teaching performance. In analysis of evaluation by assessment of learning outcomes, teaching is shown to be neither necessary nor sufficient to subsequent learning outcomes. Assessment of teacher characteristics fails to identify those characteristics peculiarly indigenous to teaching as a generic activity. Analysis of pedagogical behaviors fails to distinguish critical teaching acts from more general teacher characteristics interpretable in terms of teacher personality. Furthermore, no adequate basis is provided for normative interpretation of data pertaining to pedagogical behaviors. The use of rating scales to provide data about teacher characteristics or pedagogical behavior rests on assumed rather than demonstrated validity of results. Evidence of validity or meaningfulness is replaced by evidence of consistency which is often spurious. The first paper concludes with an outline of requirements for a more constructive approach to the task of teacher evaluation. In a second paper, an outline of a theory of teaching is sketched which conforms to these requirements. Realization of this theoretical structure in teaching assessment report forms is described. Tentative conclusions from trial use of forms-in-development and recommendations for additional data sources are discussed in terms of their potential contribution to improvement in teaching.  相似文献   
109.
110.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号