全文获取类型
收费全文 | 22916篇 |
免费 | 361篇 |
国内免费 | 15篇 |
专业分类
教育 | 16347篇 |
科学研究 | 2032篇 |
各国文化 | 218篇 |
体育 | 1903篇 |
综合类 | 13篇 |
文化理论 | 175篇 |
信息传播 | 2604篇 |
出版年
2022年 | 180篇 |
2021年 | 261篇 |
2020年 | 382篇 |
2019年 | 601篇 |
2018年 | 827篇 |
2017年 | 800篇 |
2016年 | 700篇 |
2015年 | 420篇 |
2014年 | 658篇 |
2013年 | 4429篇 |
2012年 | 636篇 |
2011年 | 646篇 |
2010年 | 469篇 |
2009年 | 484篇 |
2008年 | 539篇 |
2007年 | 480篇 |
2006年 | 426篇 |
2005年 | 408篇 |
2004年 | 367篇 |
2003年 | 356篇 |
2002年 | 341篇 |
2001年 | 475篇 |
2000年 | 394篇 |
1999年 | 359篇 |
1998年 | 203篇 |
1997年 | 210篇 |
1996年 | 240篇 |
1995年 | 235篇 |
1994年 | 181篇 |
1993年 | 200篇 |
1992年 | 321篇 |
1991年 | 298篇 |
1990年 | 298篇 |
1989年 | 298篇 |
1988年 | 255篇 |
1987年 | 301篇 |
1986年 | 265篇 |
1985年 | 304篇 |
1984年 | 246篇 |
1983年 | 211篇 |
1982年 | 190篇 |
1981年 | 163篇 |
1980年 | 153篇 |
1979年 | 258篇 |
1978年 | 182篇 |
1977年 | 168篇 |
1976年 | 153篇 |
1975年 | 141篇 |
1974年 | 147篇 |
1971年 | 140篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
996.
997.
998.
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
999.
1000.
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