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   13656篇
  免费   185篇
  国内免费   7篇
教育   9945篇
科学研究   1204篇
各国文化   82篇
体育   1112篇
综合类   7篇
文化理论   86篇
信息传播   1412篇
  2021年   105篇
  2020年   157篇
  2019年   254篇
  2018年   356篇
  2017年   365篇
  2016年   329篇
  2015年   202篇
  2014年   281篇
  2013年   2597篇
  2012年   298篇
  2011年   366篇
  2010年   223篇
  2009年   218篇
  2008年   322篇
  2007年   231篇
  2006年   303篇
  2005年   199篇
  2004年   183篇
  2003年   177篇
  2002年   214篇
  2001年   319篇
  2000年   288篇
  1999年   259篇
  1998年   128篇
  1997年   148篇
  1996年   166篇
  1995年   167篇
  1994年   133篇
  1993年   153篇
  1992年   223篇
  1991年   201篇
  1990年   202篇
  1989年   235篇
  1988年   223篇
  1987年   195篇
  1986年   190篇
  1985年   206篇
  1984年   179篇
  1983年   211篇
  1982年   144篇
  1981年   142篇
  1980年   133篇
  1979年   211篇
  1978年   162篇
  1977年   155篇
  1976年   132篇
  1975年   119篇
  1974年   110篇
  1973年   119篇
  1971年   95篇
排序方式: 共有10000条查询结果,搜索用时 765 毫秒
991.
How environmental knowledge measures up at a Big Ten university   总被引:1,自引:1,他引:0  
The reported research examines the level of environmental knowledge of Michigan State University students relative to the results of a biannual national study of the environmental knowledge of the general population of the United States. While the university students were found to possess higher levels of environmental knowledge than the general public, the students' overall environmental knowledge, on average, was deficient with only 66% of them receiving a passing grade. The findings suggest a positive correlation between academic level, field of study and environmental knowledge.  相似文献   
992.
This article examines three examples of cross-border higher education collaboration in Europe in order to throw light on one European region where such collaboration is only in its early stages of development. The main region examined is the Öresund region covering the Skåne area of Southern Sweden centred on Malmo and the Zealand region of Denmark which incorporates the Copenhagen region. Additionally, and more briefly, the Upper Rhine collaboration of the EUCOR universities and the ALMA collaboration (Netherlands, Germany and Belgium) are considered. Lessons from these examples are then used to assist in the assessment of existing collaboration between higher education institutions in the Republic of Ireland and Northern Ireland and the possibilities for further collaboration.  相似文献   
993.
Measurement of ground reaction force (GRF) in running provides a direct indication of the loads to which the body is subjected at each foot-ground contact, and can provide an objective explanation for performance outcomes. Traditionally, the collection of three orthogonal component GRF data in running requires an athlete to complete a series of return loops along a laboratory based runway, within which a force platform is embedded, in order to collect data from a discrete footfall. The major disadvantages associated with this GRF data collection methodology include the inability to assess multiple consecutive foot contacts and the fact that measurements are typically confined to the laboratory. The objective of this research was to investigate the potential for wearable instrumentation to be employed, in conjunction with artificial neural network (ANN) and multiple linear regression (MLR) models, for the estimation of GRF in middle distance running. A modular wearable data acquisition system was developed to acquire in-shoe force (ISF) data. Matched data sets from wearable instrumentation (source data) and force plate (target data) records were collected from elite middle-distance runners under controlled laboratory conditions for the purposes of ANN and MLR model development (MD) and model validation (MV). In terms of statistical measures of prediction accuracy the MLR model was found to provide a superior level of accuracy for the prediction of the vertical and medio-lateral components of GRF and alternatively, the ANN model provided the most accurate predictions of the anterior-posterior component of GRF. The prediction accuracy of each component of GRF was found to be governed by the inherent signal variability, in which case the vertical and anterior-posterior components were more reliable and subsequently predicted significantly more accurately than the medio-lateral component. The emerging capability for obtaining continuous GRF records from wearable instrumentation has the potential to permit unprecedented quantification of training stress and competition demands in running.  相似文献   
994.
Acknowledgements     

Acknowledgement

Acknowledgements  相似文献   
995.
This study had two purposes. First, we sought to compare the overall effectiveness of different types of fluency interventions for students with learning disabilities (LD). Second, we attempted to identify how individual‐ and class‐level characteristics moderated each intervention's effectiveness. We used multilevel random coefficient modeling to analyze results from 30 single‐subject studies involving 107 students with or at risk for LD. Doing so allowed us to assess the intervention's impact in terms of both intercept‐ (i.e., mean difference between study phases) and slope‐level (i.e., rate of growth) changes. Results indicated that two motivation‐focused interventions were significantly more effective than other types of interventions across gender, age, and placement. The least effective intervention was word recognition training; this finding was consistent across all levels of analyzed variables.  相似文献   
996.
The paper discusses the implementation of a new teaching programme for electrical power engineering graduates. The balance between the different parts of the curriculum (non-technical, technical non-electric, electric non-power and real electrical power) is proposed and explained given the specific context. The logical information flow throughout the education process and the links between the course topics are explained.  相似文献   
997.
Magnetism has been known as a natural phenomenon, for over two thousand years and the art of magnetizing steel was mastered half that time ago. However, it is only during this century that really substantial improvements have been made in the energy product of magnets. This article reviews the development of permanent magnets, with special reference to powerful modern alloys containing the rare earths neodymium and samarium.  相似文献   
998.
999.
1000.
Retrospective perceptions and causal beliefs regarding the temporal patterning of precompetitive psychological responses were examined in 12 elite rugby union players. Composite sequence analysis resulted in a series of temporal networks to describe participants' cognitive, affective, and behavioural responses in a time-to-event paradigm. Match-related cognitions remained stable in the lead up to competition, while perceptions of physical symptoms peaked at the onset of performance. Affective responses were associated with feelings of anxiety and tension in the early temporal phases but excitement, confidence, and efficacy in team-mates directly before competition. Behavioural themes described activities associated with technical and physical preparation, familiarization with environmental conditions, and strategies to control activation states early on or directly before competition. The findings highlight the idiosyncratic and dynamic nature of the temporal patterning of precompetitive responses and the influence that perceptions of the team have upon individual preparation for performance. Implications are discussed in the context of the type and timing of intervention for developing individual and team preparatory routines.  相似文献   
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