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   275篇
  免费   4篇
教育   205篇
科学研究   12篇
各国文化   3篇
体育   26篇
文化理论   2篇
信息传播   31篇
  2021年   1篇
  2020年   11篇
  2019年   14篇
  2018年   12篇
  2017年   13篇
  2016年   11篇
  2015年   11篇
  2014年   11篇
  2013年   62篇
  2012年   13篇
  2011年   12篇
  2010年   5篇
  2009年   4篇
  2008年   10篇
  2007年   1篇
  2006年   5篇
  2005年   3篇
  2004年   8篇
  2003年   10篇
  2002年   6篇
  2001年   2篇
  2000年   4篇
  1999年   4篇
  1998年   2篇
  1997年   3篇
  1996年   3篇
  1995年   4篇
  1994年   1篇
  1993年   3篇
  1992年   2篇
  1990年   1篇
  1989年   2篇
  1988年   2篇
  1987年   2篇
  1986年   1篇
  1985年   1篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
  1979年   1篇
  1978年   2篇
  1975年   1篇
  1974年   1篇
  1973年   2篇
  1972年   1篇
  1971年   1篇
  1970年   1篇
  1969年   2篇
  1966年   1篇
  1925年   1篇
排序方式: 共有279条查询结果,搜索用时 15 毫秒
1.
Attitudes and approaches toward the collection, use, and care of color photographs have evolved enormously since the official arrival of commercially viable color photographic processes in the early twentieth century. This article traces the evolution of collection, exhibition, and preservation practices for works of art in color photography over the last few decades, as represented by one institution, The Metropolitan Museum of Art.  相似文献   
2.
This study estimated the expected point value for starting possessions in different field locations during rugby league match-play and calculated the mean expected points for each subsequent play during the possession. It also examined the origin of tries scored according to the method of gaining possession. Play-by-play data were taken from all 768 regular-season National Rugby League (NRL) matches during 2010–2013. A probabilistic model estimated the expected point outcome based on the net difference in points scored by a team in possession in a given situation. An iterative method was used to approximate the value of each situation based on actual scoring outcomes. Possessions commencing close to the opposition’s goal-line had the highest expected point equity, which decreased as the location of the possession moved towards the team’s own goal-line. Possessions following an opposition error, penalty or goal-line dropout had the highest likelihood of a try being scored on the set subsequent to their occurrence. In contrast, possessions that follow an opposition completed set or a restart were least likely to result in a try. The expected point values framework from our model has applications for informing playing strategy and assessing individual and team performance in professional rugby league.  相似文献   
3.
This article describes the establishment in fall 2002 of a School of Education Research Center designed to support faculty in increasing productivity and quality in research. Details are provided about center goals, services, staffing, space, resources, and logistics during the first year of operation. In addition, data are shared about faculty usage of the Center, the level of faculty satisfaction with center services in the first year, and initial increases in faculty productivity. The article concludes with plans for continued data collection to monitor the impact of the Center, a discussion of lessons learned at this point in the Center's development, and possibilities for the evolution of the Center. All authors are at the University of Colorado, Denver. Laura Goodwin, Ph.D., University of Colorado at Boulder, is Interim Associate Vice Chancellor for Faculty Affairs and continues to serve as a Faculty Research Associate. Elizabeth Kozleski, Ed.D., University of Northern Colorado, is the Associate Dean for Research in the School of Education. Lynn Rhodes, Ed.D., Indiana University, is the Dean of the School of Education. Rodney Muth, Ph.D., Claremont Graduate School, is a professor of Administrative Leadership and Policy Studies in the school and chaired the Research Center Advisory Board. Kim Kennedy White, M.A., University of Oregon, was the original School of Education Research Center Coordinator and was responsible for collecting most of the data included in this study.  相似文献   
4.
Pigeons pecked on three keys, responses to one of which could be reinforced after 3 flashes of the houselight, to a second key after 6, and to a third key after 12. The flashes were arranged according to variable-interval schedules. Response allocation among the keys was a function of the number of flashes. When flashes were omitted, transitions occurred very late. Increasing flash duration produced a leftward shift in the transitions along a number axis. Increasing reinforcement probability produced a leftward shift, and decreasing reinforcement probability produced a rightward shift. Intermixing different flash rates within sessions separated allocations: Faster flash rates shifted the functions sooner in real time, but later in terms of flash count, and conversely for slower flash rates. A model of control by fading memories of number and time was proposed.  相似文献   
5.
6.
7.
Optical radiation is capable of altering the spectral reflectance of layers of colorants. Light damage is of particular importance in respect to unique historical objects in exhibitions. The major parameter governing this process is the spectral irradiance applied to the surface. As this may vary significantly for different light sources, an experimental investigation of the damage potential of the numerous illuminants available is a cumbersome task. In this work a numerical algorithm for the prediction of modifications of the spectral reflectance of colorants subject to a given arbitrary spectral irradiance over a given time is presented. It uses the temporal evolution of the spectral reflectance of the dye or pigment at issue when irradiated by a set of narrowband light sources as input data. The predicted reflectance spectra and the resulting color changes are compared to those measured for samples irradiated with common polychromatic light sources. The concept described in this work aims at the implementation of a standardized procedure and database for the prediction of radiative damage for a comprehensive range of pigments and dyes.  相似文献   
8.
This paper analyses media coverage of the England football team in the run up to Euro 2012. The study also describes the dominant discourse of ‘low expectations’ underpinning media representations of England and considers various reasons for this. Short-term factors are considered, including the resignation of the England manager, the intra-team tensions arising from racism, along with longer-term factors, including the perceived constraints placed on the England national team’s development by the English Premier League. While these factors are important, they cannot alone, or even in combination, sufficiently explain why the discourse of ‘low expectations took such a hold over media representations of the England national team. One missing factor is the broader problems facing the economy and society, particularly the preoccupation with ‘austerity’, which has created an aura of low expectations; particularly, the tendency to represent ‘austerity’ as ‘growth’ in a ‘low expectations’ culture. Previous research has demonstrated the links between the fortunes of the wider economy and sentiments surrounding the fate of the English national team. This article takes the opportunity to reconsider these wider links in terms of an elective affinity, arguing that the discourse of ‘low expectations’ haunting the England team in the present period is the manifestation and transference of a more pervasive general lowering of expectations among the media and the political elite, concerning the present and future political economic prospects of economic growth and social prosperity.  相似文献   
9.
10.
许多运动员在他们的职业生涯中都经历过在特定情境中承受反复的身心障碍(如恐惧对手,所谓的"不堪一击",双腿灌铅).原因是频繁的压抑:一种影响比赛的关键动作发挥的神经紧张状态.在很多个案中潜在焦虑过程导致的压抑源于一个消极比赛经验(如比赛中糟糕的一天或一连串糟糕的日子).  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