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   16378篇
  免费   236篇
  国内免费   8篇
教育   12235篇
科学研究   1241篇
各国文化   115篇
体育   1192篇
综合类   8篇
文化理论   93篇
信息传播   1738篇
  2021年   140篇
  2020年   193篇
  2019年   316篇
  2018年   425篇
  2017年   450篇
  2016年   416篇
  2015年   265篇
  2014年   373篇
  2013年   3107篇
  2012年   373篇
  2011年   434篇
  2010年   281篇
  2009年   293篇
  2008年   405篇
  2007年   301篇
  2006年   345篇
  2005年   261篇
  2004年   263篇
  2003年   225篇
  2002年   257篇
  2001年   359篇
  2000年   333篇
  1999年   305篇
  1998年   162篇
  1997年   192篇
  1996年   210篇
  1995年   203篇
  1994年   176篇
  1993年   190篇
  1992年   273篇
  1991年   242篇
  1990年   235篇
  1989年   258篇
  1988年   260篇
  1987年   217篇
  1986年   218篇
  1985年   233篇
  1984年   201篇
  1983年   243篇
  1982年   182篇
  1981年   176篇
  1980年   167篇
  1979年   239篇
  1978年   189篇
  1977年   170篇
  1976年   157篇
  1975年   137篇
  1974年   127篇
  1973年   126篇
  1971年   114篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
The purpose of this investigation was to describe the morphological parameters that characterize elite age group divers. Comparisons are made to normative age group data from the Coquitlam Growth Study and the constancy of important characteristics from age group to age group is examined. Data were collected on 27 male and 28 female elite divers who participated in the 1990 North American Age Group Diving Championships. Body build, body composition and skinfold corrected diameters were determined from 36 anthropometric parameters and analysed by ANOVA, t-test and Phantom z-scores procedures. All age groups except the 14- to 15-year-old males were significantly (P < or = 0.05) shorter than their norms but recorded higher androgyny index values. The estimated relative muscle mass increased significantly (P < or = 0.05) with age for males at all ages (40.8-46.3%). The 16- to 18-year-old females had a significantly (P < or = 0.05) larger relative muscle component compared to the younger age groups (40.1-38.4%). When normalized for height, active tissue development of the extremities was comparable between the sexes except in the forearm. The results indicate that at all age levels short stature is an important characteristic for divers. Analysis of regional active tissue development provides further insight into sport-specific prerequisites for success at elite levels.  相似文献   
33.
34.
35.
From the Editor     
Educational Assessment, Evaluation and Accountability -  相似文献   
36.
37.
38.
The Alfred Taubman Medical Library at the University of Michigan has offered instruction in online literature searching to third-year pharmacy students as a component of the course "Drug Information and Scientific Literature Evaluation" since 1983. In the spring of 1989, a follow-up study was conducted to assess the impact of instruction on four classes of graduates. Of a pool of 151 graduates, 90 (60%) responded to a mailed questionnaire on their use of information and computerized literature searching. The respondents were divided into four subgroups: end-user searchers, users of intermediaries, end users who used intermediaries, and those who did not use computerized literature search systems. Seventy-two percent of the respondents used some type of computerized literature searching, and 42% performed their own searches. The four subgroups differed in general computer use, familiarity with MEDLINE search terminology, information use, reasons for using or not using literature searching, and characteristics of searches (i.e., type, time frame, amount, and frequency). Training in end-user search systems appears to have had an impact on the continued use of computerized literature searching several years after the formal educational program.  相似文献   
39.
Physician information seeking: improving relevance through research   总被引:1,自引:0,他引:1  
Health sciences libraries have considerable potential as resources for both formal continuing professional education, as well as the informal continuing education that results from the professional's efforts to solve problems in daily practice. While there is a growing interest in making the resources of health sciences libraries more accessible to practitioners on a routine, day-to-day basis, there also needs to be more awareness of how, when, where, and why professionals look for information in the context of practical problems. This paper reviews recent research that identifies the context in which physicians seek information and advice from external sources, the information sources that physicians access, and the factors that influence which particular sources are sought. The results indicate that physicians vary in their information needs, preferences, motivations, and strategies for seeking information. This diversity suggests that health sciences libraries, in their efforts to be more accessible, should consider "market research" to determine the needs, preferences, and use patterns of the library's targeted users. Libraries may also benefit from exploring alternative methods of improving access to their resources.  相似文献   
40.
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