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   122488篇
  免费   1861篇
  国内免费   244篇
教育   84175篇
科学研究   13481篇
各国文化   1990篇
体育   9984篇
综合类   180篇
文化理论   1091篇
信息传播   13692篇
  2021年   952篇
  2020年   1669篇
  2019年   2581篇
  2018年   3190篇
  2017年   3438篇
  2016年   3445篇
  2015年   2324篇
  2014年   3186篇
  2013年   27265篇
  2012年   2489篇
  2011年   2911篇
  2010年   2408篇
  2009年   2662篇
  2008年   2510篇
  2007年   2252篇
  2006年   2480篇
  2005年   2456篇
  2004年   3144篇
  2003年   2409篇
  2002年   2240篇
  2001年   2191篇
  2000年   1871篇
  1999年   1726篇
  1998年   1481篇
  1997年   1437篇
  1996年   1561篇
  1995年   1362篇
  1994年   1359篇
  1993年   1349篇
  1992年   1479篇
  1991年   1371篇
  1990年   1384篇
  1989年   1317篇
  1988年   1150篇
  1987年   1126篇
  1986年   1126篇
  1985年   1361篇
  1984年   1240篇
  1983年   1166篇
  1982年   1102篇
  1981年   1040篇
  1980年   993篇
  1979年   1179篇
  1978年   1092篇
  1977年   990篇
  1976年   911篇
  1975年   739篇
  1974年   749篇
  1973年   713篇
  1971年   569篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
No matter one’s wealth or social position, all are subject to the threats of natural hazards. Be it fire, flood, hurricane, earthquake, tornado, or drought, the reality of hazard risk is universal. In response, governments, non-profits, and the private sector all support research to study hazards. Each has a common end in mind: to increase the resilience of vulnerable communities. While this end goal is shared across hazards, the conception of how to get there can diverge considerably. The earthquake and hurricane research endeavors in the US provide an illustrative contrast. The earthquake community sets out to increase resilience through a research process that simultaneously promotes both high quality and usable – preparedness-focused - science. In order to do so, the logic suggests that research must be collaborative, responsive, and transparent. Hurricane research, by contrast, largely promotes high quality science – predictions - alone, and presumes that usability should flow from there. This process is not collaborative, responsive, or transparent. Experience suggests, however, that the latter model – hurricane research - does not prepare communities or decision makers to use the high quality science it has produced when a storm does hit. The predictions are good, but they are not used effectively. Earthquake research, on the other hand, is developed through a collaborative process that equips decision makers to know and use hazards research knowledge as soon as an earthquake hits. The contrast between the two fields suggests that earthquake research is more likely to meet the end goal of resilience than is hurricane research, and thus that communities might be more resilient to hurricanes were the model by which research is funded and conducted to change. The earthquake research experience can provide lessons for this shift. This paper employs the Public Value Mapping (PVM) framework to explore these two divergent public value logics, their end results, and opportunities for improvement.  相似文献   
962.
Research in Higher Education - Since the turn of the twenty-first century, going to college has become increasingly financially difficult in the United States. Tuition prices continued to rise,...  相似文献   
963.
964.
965.
966.
967.
968.
ABSTRACT

The literature on momentum is still undecided, with mixed results whether momentum exists or is only perceived to exist (“hot hand fallacy”). We explore whether momentum exists by looking at cases in which a basketball player has three consecutive free throws. A free throw is a well-defined task executed in a stable environment, allegedly giving momentum optimal chances to occur. Taking 14 NBA seasons we collected over 4500 three-free-throw sets (triplets). We obtained the outcomes of the shots as well as some additional variables about the player and the game: the player’s average free-throw percentage, home or away, and the game score and the quarter when the free throws were attempted. We first analyse the hit rates in the three shots and then proceed to regression analysis that also controls for the abovementioned variables. We address several concerns raised in the literature. All comparisons and analyses yield the same conclusion that there is no evidence for momentum in the data.  相似文献   
969.
970.
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