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   17320篇
  免费   253篇
  国内免费   30篇
教育   12258篇
科学研究   1722篇
各国文化   159篇
体育   1523篇
综合类   9篇
文化理论   158篇
信息传播   1774篇
  2021年   177篇
  2020年   248篇
  2019年   373篇
  2018年   499篇
  2017年   495篇
  2016年   497篇
  2015年   333篇
  2014年   425篇
  2013年   3207篇
  2012年   406篇
  2011年   436篇
  2010年   420篇
  2009年   350篇
  2008年   409篇
  2007年   375篇
  2006年   336篇
  2005年   300篇
  2004年   322篇
  2003年   283篇
  2002年   267篇
  2001年   509篇
  2000年   394篇
  1999年   324篇
  1998年   190篇
  1997年   216篇
  1996年   187篇
  1995年   168篇
  1994年   192篇
  1993年   153篇
  1992年   210篇
  1991年   234篇
  1990年   226篇
  1989年   222篇
  1988年   188篇
  1987年   196篇
  1986年   195篇
  1985年   234篇
  1984年   196篇
  1983年   159篇
  1982年   149篇
  1981年   143篇
  1980年   134篇
  1979年   172篇
  1978年   148篇
  1977年   139篇
  1976年   102篇
  1975年   124篇
  1974年   116篇
  1973年   111篇
  1971年   97篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
81.
This paper explores surviving documentation and what it reveals about the underlying social structure and relations in a historic time and place. The mid-nineteenth century is chosen as a period prior to modern bureaucracies so that documents are not found in defining filing systems. Some six hundred documents are studied individually and characterized collectively. They are examined not to tell a story, however, but for evidence of their creation and maintenance and of their physical types, functional characteristics, and relations between authors and recipients. The study reveals the fruitfulness of such an orientation to documents, which complements traditional historical uses that emphasize document content.  相似文献   
82.
83.
84.
Controversy concerning the issue of homosexual rights and practiceshas intensified in Britain over the last decade. Despite thisincrease in intensity, however, the question of mass publicopinion in relation to homosexual rights and practices has receivedalmost no empirical investigation. In an effort to remedy thissituation, this article focuses on both the role of respondents'gender as well as their perceptions concerning the gender ofparticipants in a homosexual relationship (both sexes versusgay men) in distinguishing their attitudes toward the publicacceptance of homosexuals and the adoption rights of lesbiansand gay men. Using nationally representative data from the BritishSocial Attitudes Surveys, we found that, whereas both respondents'gender and the gender of participants in a homosexual relationshipdemonstrated a significant influence on attitudes toward thepublic acceptance of homosexuals, they were unrelated to theadoption rights of lesbians or gay men. Even in relation tothe public acceptance of homosexuals, however, gender was notthe only, or even the most important, attribute in distinguishingindividual opinion in this instance. Other stronger and moreconsistent influences were education, age, and attitudes towardeither pre-marital or extra-marital sexual relations. The implicationsof these findings for both policy makers and homosexual activistsare discussed.  相似文献   
85.
One of the highest priorities in today's hospitals is the provision of quality care to patients. The medical librarian has an increased responsibility to furnish quality information to the medical staff. Traditional methods of reference service continue to work well, but it is increasingly important for librarians to become more directly involved in hospital quality assurance (QA) activities. Occurrence screening is one system of QA where the librarian can make a difference.  相似文献   
86.
<正> 一、基本概念"实验"可以定义为研究者对起重要作用的条件加以精确地说明和控制的一种研究方式.改变一个或多个自变量的值,观察这种变化对于一个或多个实验组的各个因变量值的影响.而其它可能与研究课题有关的(即影响因变量的值)因素,则通过精密的实验将其限制在最小程度.这样,通过控制实验的条件,研究假设的基本要求就得到满足.在图书馆学方面,实验方法可以用于鉴定那些有关图书馆藏书建设,藏书保管和藏书利用等方面的新技术,说明那些定义不准  相似文献   
87.
88.
89.
You are invited to Seattle for the 1977 Annual Meeting, its theme to be "Change, Comparison, and Controversy." Suggestions are made for activities in Seattle and the Pacific Northwest, including the cohost city, Vancouver, British Columbia.  相似文献   
90.
Indexing consistency in MEDLINE   总被引:3,自引:0,他引:3  
The quality of indexing of periodicals in a bibliographic data base cannot be measured directly, as there is no one "correct" way to index an item. However, consistency can be used to measure the reliability of indexing. To measure consistency in MEDLINE, 760 twice-indexed articles from 42 periodical issues were identified in the data base, and their indexing compared. Consistency, expressed as a percentage, was measured using Hooper's equation. Overall, checktags had the highest consistency. Medical Subject Headings (MeSH) and subheadings were applied more consistently to central concepts than to peripheral points. When subheadings were added to a main heading, consistency was lowered. "Floating" subheadings were more consistent than were attached subheadings. Indexing consistency was not affected by journal indexing priority, language, or length of the article. Terms from MeSH Tree Structure categories A, B, and D appeared more often than expected in the high-consistency articles; whereas terms from categories E, F, H, and N appeared more often than expected in the low-consistency articles. MEDLINE, with its excellent controlled vocabulary, exemplary quality control, and highly trained indexers, probably represents the state of the art in manually indexed data bases.  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