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   13347篇
  免费   212篇
  国内免费   11篇
教育   9234篇
科学研究   1674篇
各国文化   115篇
体育   1002篇
综合类   18篇
文化理论   161篇
信息传播   1366篇
  2022年   92篇
  2021年   136篇
  2020年   210篇
  2019年   279篇
  2018年   403篇
  2017年   433篇
  2016年   385篇
  2015年   259篇
  2014年   372篇
  2013年   2194篇
  2012年   325篇
  2011年   312篇
  2010年   300篇
  2009年   262篇
  2008年   285篇
  2007年   298篇
  2006年   275篇
  2005年   232篇
  2004年   264篇
  2003年   228篇
  2002年   237篇
  2001年   315篇
  2000年   334篇
  1999年   253篇
  1998年   139篇
  1997年   183篇
  1996年   177篇
  1995年   124篇
  1994年   131篇
  1993年   118篇
  1992年   197篇
  1991年   183篇
  1990年   214篇
  1989年   210篇
  1988年   180篇
  1987年   195篇
  1986年   173篇
  1985年   208篇
  1984年   151篇
  1983年   131篇
  1982年   125篇
  1981年   95篇
  1980年   96篇
  1979年   167篇
  1978年   111篇
  1977年   98篇
  1975年   87篇
  1974年   89篇
  1973年   85篇
  1971年   82篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Looking for laws     
S. French 《Metascience》2006,15(3):437-469
  相似文献   
22.
What legal issues may arise in setting content or performance standards? What precedents are relevant? What practices are defensible?  相似文献   
23.
Conclusion Computer-based career systems should be the focal point of popular, and effective career development initiatives which are of tremendous benefit to individuals. Such initiatives also have the potential to significantly reduce public expenditures and enhance the nation's competitive position internationally. The key lies in helping people understand that we can no longer afford to neglect the career development needs of Americans.I am most grateful for this opportunity to share my thoughts with you. I encourage you to promote the use of computer-based career systems by defining their benefits in economic terms. However, be sure you can prove your system does more than simply entertain its users, or leave them with extensive computer printouts.Phillip S. Jarvis is Manager, Careerware Research and Product Design, STM Systems Corp., Ottawa, Ontario, Canada and the author of CHOICES. This is the text of a paper presented to the Annual Conference of the Association of Computer-Based Systems for Career Information ((ACSCI) in St. Louis, Missouri on December 2, 1988.  相似文献   
24.
There is limited information on the anthropometry, strength, endurance and flexibility of female rock climbers. The aim of this study was to compare these characteristics in three groups of females: Group 1 comprised 10 elite climbers aged 31.3 +/- 5.0 years (mean +/- s) who had led to a standard of 'hard very severe'; Group 2 consisted of 10 recreational climbers aged 24.1 +/- 4.0 years who had led to a standard of 'severe'; and Group 3 comprised 10 physically active individuals aged 28.5 +/- 5.0 years who had not previously rock-climbed. The tests included finger strength (grip strength, finger strength measured on climbing-specific apparatus), flexibility, bent arm hang and pull-ups. Regression procedures (analysis of covariance) were used to examine the influence of body mass, leg length, height and age. For finger strength, the elite climbers recorded significantly higher values (P < 0.05) than the recreational climbers and non-climbers (four fingers, right hand: elite 321 +/- 18 N, recreational 251 +/- 14 N, non-climbers 256 +/- 15 N; four fingers, left hand: elite 307 +/- 14 N, recreational 248 +/- 12 N, non-climbers 243 +/- 11 N). For grip strength of the right hand, the elite climbers recorded significantly higher values than the recreational climbers only (elite 338 +/- 12 N, recreational 289 +/- 10 N, non-climbers 307 +/- 11 N). The results suggest that elite climbers have greater finger strength than recreational climbers and non-climbers.  相似文献   
25.
26.
27.
28.
29.
30.
The roles of academic health sciences librarians are continually evolving as librarians initiate new programs and services in response to developments in computer technology and user demands. However, statistics currently collected by libraries do not accurately reflect or measure these new roles. It is essential for librarians to document, measure, and evaluate these new activities to continue to meet the needs of users and to ensure the viability of their professional role. To determine what new measures should be compiled, the authors examined current statistics, user demands, professional literature, and current activities of librarians as reported in abstracts of poster sessions at Medical Library Association annual meetings. Three new categories of services to be measured are proposed. The first, consultation, groups activities such as quality filtering and individual point-of-need instruction. The second, outreach, includes activities such as working as liaisons, participating in grand rounds or morning report, and providing continuing education. The third area, Web authoring, encompasses activities such as designing Web pages, creating online tutorials, and developing new products. Adding these three measures to those already being collected will provide a more accurate and complete depiction of the services offered by academic health sciences librarians.  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