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   26091篇
  免费   240篇
  国内免费   11篇
教育   18957篇
科学研究   2912篇
各国文化   143篇
体育   1399篇
综合类   17篇
文化理论   544篇
信息传播   2370篇
  2022年   109篇
  2021年   158篇
  2020年   248篇
  2019年   350篇
  2018年   2616篇
  2017年   2564篇
  2016年   2040篇
  2015年   418篇
  2014年   536篇
  2013年   2480篇
  2012年   582篇
  2011年   1087篇
  2010年   1166篇
  2009年   721篇
  2008年   947篇
  2007年   1461篇
  2006年   350篇
  2005年   628篇
  2004年   736篇
  2003年   594篇
  2002年   378篇
  2001年   329篇
  2000年   360篇
  1999年   263篇
  1998年   147篇
  1997年   198篇
  1996年   185篇
  1995年   123篇
  1994年   138篇
  1993年   122篇
  1992年   206篇
  1991年   192篇
  1990年   219篇
  1989年   219篇
  1988年   185篇
  1987年   200篇
  1986年   175篇
  1985年   212篇
  1984年   156篇
  1983年   136篇
  1982年   133篇
  1981年   113篇
  1980年   121篇
  1979年   182篇
  1978年   135篇
  1977年   116篇
  1976年   93篇
  1975年   96篇
  1974年   99篇
  1973年   95篇
排序方式: 共有10000条查询结果,搜索用时 462 毫秒
991.
From the earliest years in the development of confidence testing, several authors have expressed the concern that confidence test scores were influenced, to a measurable degree, by personality variables. Advocates of confidence testing have claimed that the effects of personality variables can be reduced with practice. This study attempts to evaluate the association of personality variables with confidence test scores in light of practice. It was concluded that although significant correlations between personality variables and confidence testing scores could be obtained, these correlations did not hold up with replication.  相似文献   
992.
993.
994.
Over a five-year period, much progress has been made in meeting the needs of health care personnel in the Detroit metropolitan area through library cooperation. These cooperative relationships have stimulated implementation of the following projects: (1) publications, (2) research on medical library problems, and (3) library programs at both the city and state levels.  相似文献   
995.
996.
997.
Heisenberg’s contributions to the understanding of ferromagnetism are reviewed. The special features of ferromagnetism, vis-a-vis dia and para magnetism, are introduced and the necessity of a Weiss molecular field is explained. It is shown how Heisenberg identified the quantum mechanical exchange interaction, which first appeared in the context of chemical bonding, to be the essential agency, contributing to the co-operative ordering process in ferromagnetism.  相似文献   
998.
999.
美国图书馆协会的<职业道德规范声明>提出了以图书馆事业为中心的具体原则,其<图书馆权利法案>则明确了图书馆的责任和义务.目前,美国社会和政治环境的变化为图书馆职业带来了越来越多的忧虑和压力."9·11"后出台的<爱国者法案>明显与图书馆职业道德规范中所阐述的重要原则相冲突.因此,美国图书馆协会决心抵制<爱国者法案>对知识、信息自由开放以及行使个人隐私权的限制.  相似文献   
1000.
OBJECTIVES: Medicine must keep current with the research literature, and keeping current requires continuously updating the clinical knowledge base (i.e., references that provide answers to clinical questions). The authors estimated the volume of medical literature potentially relevant to primary care published in a month and the time required for physicians trained in medical epidemiology to evaluate it for updating a clinical knowledge base. METHODS: We included journals listed in five primary care journal review services (ACP Journal Club, DynaMed, Evidence-Based Practice, Journal Watch, and QuickScan Reviews). Finding little overlap, we added the 2001 "Brandon/Hill Selected List of Print Books and Journals for the Small Medical Library." We counted articles (including letters, editorials, and other commentaries) published in March 2002, using bibliographic software where possible and hand counting when necessary. For journals not published in March 2002, we reviewed the nearest issue. Five primary care physicians independently evaluated fifty randomly selected articles and timed the process. RESULTS: The combined list contained 341 currently active journals with 8,265 articles. Adjusting for publication frequency, we estimate 7,287 articles are published monthly in this set of journals. Physicians trained in epidemiology would take an estimated 627.5 hours per month to evaluate these articles. CONCLUSIONS: To provide practicing clinicians with the best current evidence, more comprehensive and systematic literature surveillance efforts are needed.  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