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   7808篇
  免费   85篇
  国内免费   20篇
教育   5312篇
科学研究   1160篇
各国文化   29篇
体育   459篇
综合类   13篇
文化理论   94篇
信息传播   846篇
  2022年   40篇
  2021年   60篇
  2020年   86篇
  2019年   124篇
  2018年   210篇
  2017年   290篇
  2016年   319篇
  2015年   229篇
  2014年   210篇
  2013年   841篇
  2012年   281篇
  2011年   298篇
  2010年   201篇
  2009年   131篇
  2008年   180篇
  2007年   191篇
  2006年   150篇
  2005年   750篇
  2004年   547篇
  2003年   377篇
  2002年   193篇
  2001年   168篇
  2000年   160篇
  1999年   114篇
  1998年   76篇
  1997年   67篇
  1996年   67篇
  1995年   45篇
  1994年   46篇
  1993年   34篇
  1992年   76篇
  1991年   69篇
  1990年   61篇
  1989年   63篇
  1988年   75篇
  1987年   62篇
  1986年   78篇
  1985年   70篇
  1984年   55篇
  1983年   69篇
  1982年   53篇
  1981年   40篇
  1980年   29篇
  1979年   52篇
  1978年   49篇
  1977年   37篇
  1976年   43篇
  1975年   31篇
  1974年   33篇
  1973年   33篇
排序方式: 共有7913条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
36.
37.
38.
Our library has previously investigated the potential impact the addition of contents notes on circulation. In a subsequent study, we found contents notes were the second metadata element most heavily linked to circulation (title was first). Since there has been a marked decline in the use of print resources at our library and a corresponding increase in digital resources, we wanted to know if the addition of contents notes to records for online streaming audio files would result in a similar increase in usage. After enhancing the records, we tracked usage for a period of three months.  相似文献   
39.
Although the USSR and the United States had a comparable number of employees in the field of scientific information, there was a substantial difference in funding, which resulted in a lack of information support for Soviet scientists. While 90% of the publications in the United States were available almost immediately after their release, in the USSR they were delayed by 1.5 to 2 years. Since the publication of the Abstracts Journal by VINITI (AJ), its content was consistently expanding and reached its peak in 1990 (1.5 million documents per year). The next quarter of a century was characterized by a decline in both the composition of the AJ and the time required for its document coverage. The steps for restructuring VINITI activities are discussed. The focus is made on improving the limited coverage of the Russian-language part of the global flow of scientific information by Western information systems.  相似文献   
40.
This study examined whether persuasive health messages embedded in shooter games have broad or targeted effects on players’ willingness to engage in risk behaviors (N = 145). Participants presented with in-game health messages discouraging alcohol-impaired driving of motor vehicles showed reduced willingness to drink alcohol and to operate both motor and nonmotor vehicles, compared to those in a no-message gaming control condition. There were no spillover effects on willingness to smoke cigarettes or marijuana, thus implying targeted persuasive effects. In addition, players experiencing high instead of low cognitive load showed decreased postexperiment willingness to drink and operate nonmotor vehicles, thus suggesting that playing a game under high cognitive load can influence players’ attitudes. The findings replicate previous research and further expand on knowledge-activation and thought-disruption mechanisms underlying the persuasiveness of health messages.  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