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   23058篇
  免费   406篇
  国内免费   16篇
教育   16517篇
科学研究   2033篇
各国文化   219篇
体育   1908篇
综合类   13篇
文化理论   175篇
信息传播   2615篇
  2022年   177篇
  2021年   264篇
  2020年   386篇
  2019年   605篇
  2018年   838篇
  2017年   811篇
  2016年   713篇
  2015年   432篇
  2014年   661篇
  2013年   4460篇
  2012年   642篇
  2011年   654篇
  2010年   484篇
  2009年   498篇
  2008年   555篇
  2007年   485篇
  2006年   427篇
  2005年   416篇
  2004年   369篇
  2003年   356篇
  2002年   343篇
  2001年   476篇
  2000年   394篇
  1999年   363篇
  1998年   204篇
  1997年   212篇
  1996年   242篇
  1995年   236篇
  1994年   182篇
  1993年   201篇
  1992年   321篇
  1991年   298篇
  1990年   301篇
  1989年   299篇
  1988年   255篇
  1987年   303篇
  1986年   267篇
  1985年   304篇
  1984年   247篇
  1983年   211篇
  1982年   191篇
  1981年   163篇
  1980年   153篇
  1979年   259篇
  1978年   182篇
  1977年   168篇
  1976年   153篇
  1975年   142篇
  1974年   148篇
  1971年   141篇
排序方式: 共有10000条查询结果,搜索用时 937 毫秒
991.
992.
993.
994.
995.
996.
997.
Early and continued participation in a work-site health and fitness program   总被引:1,自引:0,他引:1  
This study examines social-environmental, physical-behavioral, and psychological factors influencing early and continued participation in physical activity. Data for the study were collected during the first six months of operation of a work-site Health and Fitness Center. The following sources were used to collect data (N = 403): 1) printouts of frequency of employee visits to the Health and Fitness Center; 2) a questionnaire; and 3) fitness files. Data measuring early (month one) and continued (month six) participation were obtained from printouts of frequency of employee visits. A questionnaire measured estimation of physical ability, attraction to physical activity, youth participation, social support, and convenience of the Health and Fitness Center. Fitness files were used to obtain measures of cardiovascular fitness, percent body fat, and recent participation. Linear discriminant analysis was conducted to determine the practical usefulness of the social-environmental, physical-behavioral, and psychological factors for classifying employees into categories of exercise adherers and nonadherers. A measure of exercise adherence was based on company policy of six visits each month. Results for early participation (month one) indicated that convenience, sex, youth participation, attitudinal commitment, and age discriminated (p less than .05) among adherers and nonadherers with 63% accuracy. At the end of six months, attitudinal commitment, sex, convenience, and estimation of physical ability discriminated (p less than .05) among adherers and non-adherers with 60% accuracy. In addition, when early participation in the health and fitness program served as the measure of recent participation for the six month analysis, recent participation and attitudinal commitment discriminated (p less than .05) between the two adherence categories with 75% accuracy. Adherers and nonadherers were classified with 66% and 85% accuracy, respectively.  相似文献   
998.
999.
The University of Oklahoma Health Sciences Center (OUHSC) Library mailed a MEDLINE End User Practice Survey Form to 310 health professionals who had attended MEDLINE seminars supported by a two-year NLM grant. The survey sought to determine how many respondents had obtained NLM codes, reasons for not obtaining a code, searching time done since the seminar, differences in the use of information since taking the seminar, factors helpful in successful searching, and factors contributing to frustrations. The most prevalent reasons for not obtaining a code were lack of a microcomputer and modem, infrequent use of MEDLINE, cost, lack of time, complications, and ability to obtain free searches.  相似文献   
1000.
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