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   285篇
  免费   9篇
教育   196篇
科学研究   25篇
各国文化   1篇
体育   35篇
文化理论   3篇
信息传播   34篇
  2023年   2篇
  2022年   3篇
  2021年   2篇
  2020年   8篇
  2019年   5篇
  2018年   14篇
  2017年   19篇
  2016年   14篇
  2015年   13篇
  2014年   15篇
  2013年   58篇
  2012年   10篇
  2011年   9篇
  2010年   7篇
  2009年   5篇
  2008年   7篇
  2007年   5篇
  2006年   5篇
  2005年   10篇
  2004年   2篇
  2003年   2篇
  2002年   4篇
  2000年   3篇
  1999年   4篇
  1996年   2篇
  1995年   4篇
  1994年   2篇
  1992年   3篇
  1991年   2篇
  1990年   3篇
  1983年   2篇
  1982年   2篇
  1980年   2篇
  1978年   3篇
  1973年   2篇
  1972年   2篇
  1962年   2篇
  1957年   2篇
  1956年   5篇
  1955年   2篇
  1932年   1篇
  1931年   1篇
  1929年   1篇
  1928年   1篇
  1926年   2篇
  1897年   2篇
  1885年   1篇
  1877年   1篇
  1866年   1篇
  1843年   1篇
排序方式: 共有294条查询结果,搜索用时 15 毫秒
41.
In current science policies, competition and output incentives are emphasized as a means of making university systems efficient and productive. By comparing eight countries, this article analyzes how funding environments of university research vary across countries and whether more competitive funding systems are more efficient in producing scientific publications. The article shows that there are significant differences in the competitiveness of funding systems, but no straightforward connection between financial incentives and the efficiency of university systems exists. Our results provoke questions about whether financial incentives boost publication productivity, and whether policy-makers should place greater emphasis on other factors relevant to high productivity.  相似文献   
42.
In this article, we describe an innovative capstone course for preservice K-8 teachers integrating action research and a unifying theme in science (AAAS in Science for all Americans. Oxford University Press, New York, 1989; NRC in National science education standards. National Academy Press, Washington, DC, 1996). The goals of the capstone course are to increase student knowledge of the unifying theme, improve written communication skills, and introduce students to educational research. We provide evidence that each of these goals is met. Student growth in theme knowledge is demonstrated through concept maps, questionnaires, and previously reported assessments. Improved writing ability is demonstrated using the spelling and grammar checking feature of Microsoft Word. The analysis of action research reports demonstrates that students are able to connect their action research project results to previous research.  相似文献   
43.
Abstract

To determine the energy cost of low impact aerobic dance while varying arm movement height and the use of hand weights, 10 adults volunteered to participate in four choreographed trials. All trials consisted of identical leg movements. Arm movements, however, were performed above shoulder level both with and without 0.9-kg hand weights and below shoulder level both with and without 0.9-kg hand weights. Open circuit spirometry was employed throughout the 10-min videotape guided trials, and heart rate was measured by telemetry. Neither the use of hand weights nor the change in arm position height significantly altered the energy cost of low impact aerobic dance. However, heart rate responses were significantly different. Caution should be observed by aerobics instructors and participants as to the use of heart rate as an indicator of intensity for low impact aerobic dance.  相似文献   
44.
Abstract

The displacement of the golf ball struck by a driving club is affected by several player characteristics and equipment parameters and their interrelationships. Some modelling and simulation studies have shown a relationship between shaft length and clubhead speed, supported by a few experimental studies. The aim of the present study was to examine the relationship between driver length and ball launch conditions in an indoor test facility using a ball launch monitor. Nine males considered to be skilled golfers participated in the study. Four driving clubs of total length 117, 119, 124, and 132 cm were assembled from commercially available components and were used to strike golf shots while initial ball velocity, backspin rate, and launch angles were measured. Statistical analysis identified a significant difference in initial launch speed due to club length, a significant difference between participants, but no difference between the trials for a given golfer. A positive trend was noted between backspin and launch angle for all four clubs, and significant inverse associations between initial launch speed and backspin rate and launch angle. However, the combined launch conditions associated with increasing length were not considered optimal, with uncontrolled swingweight and moment of inertia effects considered to be limiting factors.  相似文献   
45.
Abstract

Previous studies on the kinematics of the golf swing have mainly focused on group analysis of male golfers of a wide ability range. In the present study, we investigated gross body kinematics using a novel method of analysis for golf research for a group of low handicap female golfers to provide an understanding of their swing mechanics in relation to performance. Data were collected for the drive swings of 16 golfers using a 12-camera three-dimensional motion capture system and a stereoscopic launch monitor. Analysis of covariance identified three covariates (increased pelvis–thorax differential at the top of the backswing, increased pelvis translation during the backswing, and a decrease in absolute backswing time) as determinants of the variance in clubhead speed (adjusted r 2 = 0.965, P < 0.05). A significant correlation was found between left-hand grip strength and clubhead speed (r = 0.54, P < 0.05) and between handicap and clubhead speed (r = ?0.612, P < 0.05). Flexibility measures showed some correlation with clubhead speed; both sitting flexibility tests gave positive correlations (clockwise: r = 0.522, P < 0.05; counterclockwise: r = 0.711, P < 0.01). The results suggest that there is no common driver swing technique for optimal performance in low handicap female golfers, and therefore consideration should be given to individual swing characteristics in future studies.  相似文献   
46.
This case study draws on theory in the following areas (1) public financing of sport facilities and in particular, the method of bonds and the impact on and involvement of local taxpayers, (2) community impact of minor league sport teams, and (3) leveraging of sport teams and facilities. This case is centered on Justin Drew, the president of the Corpus Christi Hooks, who must work with city officials to ensure that his minor league baseball team does not lose local support. The city of Corpus Christi helped finance the Hooks’ stadium a few years prior, and now with new members on City Council, tough economic times, and a history of folded professional sports teams in the city, Drew must be proactive in seeing that the Hooks do not meet a similar fate.The case presents a common challenge confronted by communities that host professional sport teams. In many cases, cities must provide some level of public financing for sport facilities in order to attract or retain a team. To gain public support, various promises are made about the potential for the team to transform the community. However, once public funding is secured and a team and facility is in place, it is unclear who has the responsibility for delivering on these promises. The situation presented in this case is not unique. In fact, similar claims are made about the impact of a sports team, regardless of the size of the host community or the type of team. This case gives students the opportunity to measure impact and also think critically about how to leverage a sports team to create value for the community. Although the characters in the case are fictitious the case draws upon actual facts and data from public records regarding Corpus Christi and their minor league baseball team, the Hooks; thus, providing students with a realistic dilemma to consider. The case is intended for use in Sport Finance/Economics and Sport Policy courses, but could also be adapted for other courses such as Sport Marketing, Sport Communication, Facilities and Event Management or even Research Methods.  相似文献   
47.
48.
49.
就中国在国际气候变化协议中的位置、中国怎样减少CO2排放、有关碳交易的制度建设、中国在国际碳交易市场中扮演的角色和气候变化协定中的重要性进行了探讨,介绍了美国正在运行的气候法案的主要内容,并提出了中国目前的气候政策和碳交易市场发展中存在的问题,在国际气候大环境中和美国进行了分析对比。  相似文献   
50.
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