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   22011篇
  免费   295篇
  国内免费   122篇
教育   15131篇
科学研究   2907篇
各国文化   176篇
体育   1747篇
综合类   13篇
文化理论   164篇
信息传播   2290篇
  2021年   164篇
  2020年   284篇
  2019年   433篇
  2018年   593篇
  2017年   518篇
  2016年   524篇
  2015年   331篇
  2014年   435篇
  2013年   3854篇
  2012年   419篇
  2011年   469篇
  2010年   364篇
  2009年   346篇
  2008年   366篇
  2007年   382篇
  2006年   371篇
  2005年   362篇
  2004年   361篇
  2003年   331篇
  2002年   320篇
  2001年   362篇
  2000年   369篇
  1999年   362篇
  1998年   205篇
  1997年   213篇
  1996年   260篇
  1995年   224篇
  1994年   185篇
  1993年   225篇
  1992年   306篇
  1991年   319篇
  1990年   327篇
  1989年   336篇
  1988年   283篇
  1987年   306篇
  1986年   299篇
  1985年   342篇
  1984年   294篇
  1983年   291篇
  1982年   259篇
  1981年   233篇
  1980年   221篇
  1979年   331篇
  1978年   268篇
  1977年   250篇
  1976年   215篇
  1975年   176篇
  1974年   208篇
  1973年   189篇
  1971年   164篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Cancelled charge slips collected over a one-year period supply the data for this analysis of circulation in the Yale Medical Library. Full-time teaching faculty are the heaviest users of journal literature, and students, of monograph literature. Faculties of Medical School departments are compared in terms of their use of material in individual subjects. Subject literatures are analyzed in terms of groups of users borrowing from them. The extent to which journal titles used by medical students are also used by Medical School faculty is examined. One of the products of the study is a rank list of journal titles used in the Library. Results are presented in several tables.  相似文献   
72.
Time series analysis was used to investigate the hypothesis that during acquisition of a motor skill, knowledge of results (KR) information is used to generate a stable internal referent about which response errors are randomly distributed. Sixteen subjects completed 50 acquisition trials of each of three movements whose spatial-temporal characteristics differed. Acquisition trials were either blocked, with each movement being presented in series, or randomized, with the presentation of movements occurring in random order. Analysis of movement time data indicated the contextual interference effect reported in previous studies was replicated in the present experiment. Time series analysis of the acquisition trial data revealed the majority of individual subject response patterns during blocked trials were best described by a model with a temporarily stationary, internal reference of the criterion and systematic, trial-to-trial variation of response errors. During random trial conditions, response patterns were usually best described by a "White-noise" model. This model predicts a permanently stationary, internal reference associated with randomly distributed response errors that are unaffected by KR information. These results are not consistent with previous work using time series analysis to describe motor behavior (Spray & Newell, 1986).  相似文献   
73.
74.
75.
76.
Web sites are increasingly used by academic libraries to promote key services and collections to teaching faculty. This study analyzes the content, location, language, and technological features of fifty-four academic library Web pages designed especially for faculty to expose patterns in the development of these pages.  相似文献   
77.
78.
79.
80.
Among the huge maze of resources available on the Internet, UnCoverWeb stands out as a valuable tool for medical libraries. This up-to-date, free-access, multidisciplinary database of periodical references is searched through an easy-to-learn graphical user interface that is a welcome improvement over the telnet version. This article reviews the basic and advanced search techniques for UnCoverWeb, as well as providing information on the document delivery functions and table of contents alerting service called Reveal. UnCover's currency is evaluated and compared with other current awareness resources. System deficiencies are discussed, with the conclusion that although UnCoverWeb lacks the sophisticated features of many commercial database search services, it is nonetheless a useful addition to the repertoire of information sources available in a library.  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