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   73348篇
  免费   4534篇
  国内免费   273篇
耳鼻咽喉   1136篇
儿科学   2051篇
妇产科学   1354篇
基础医学   8183篇
口腔科学   1531篇
临床医学   7221篇
内科学   15143篇
皮肤病学   1182篇
神经病学   7090篇
特种医学   2527篇
外国民族医学   5篇
外科学   12668篇
综合类   921篇
一般理论   95篇
预防医学   6080篇
眼科学   1516篇
药学   4655篇
中国医学   114篇
肿瘤学   4683篇
  2023年   412篇
  2022年   672篇
  2021年   1856篇
  2020年   998篇
  2019年   1611篇
  2018年   1885篇
  2017年   1351篇
  2016年   1396篇
  2015年   1548篇
  2014年   2365篇
  2013年   3331篇
  2012年   4998篇
  2011年   5162篇
  2010年   2825篇
  2009年   2517篇
  2008年   4563篇
  2007年   4814篇
  2006年   4671篇
  2005年   4644篇
  2004年   4367篇
  2003年   4003篇
  2002年   3722篇
  2001年   598篇
  2000年   523篇
  1999年   678篇
  1998年   763篇
  1997年   677篇
  1996年   606篇
  1995年   535篇
  1994年   516篇
  1993年   432篇
  1992年   397篇
  1991年   390篇
  1990年   328篇
  1989年   312篇
  1988年   302篇
  1987年   281篇
  1986年   293篇
  1985年   379篇
  1984年   457篇
  1983年   371篇
  1982年   538篇
  1981年   501篇
  1980年   458篇
  1979年   220篇
  1978年   283篇
  1977年   271篇
  1976年   216篇
  1975年   224篇
  1973年   189篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
HIV risk in vulnerable groups such as itinerant male street labourers is often examined via a focus on individual determinants. This study provides a test of a modified Information-Motivation-Behavioral Skills (IMB) model to predict condom use behaviour among male street workers in urban Vietnam. In a cross-sectional survey using a social mapping technique, 450 male street labourers from 13 districts of Hanoi, Vietnam were recruited and interviewed. Collected data were first examined for completeness; structural equation modelling was then employed to test the model fit. Condoms were used inconsistently by many of these men, and usage varied in relation to a number of factors. A modified IMB model had a better fit than the original IMB model in predicting condom use behaviour. This modified model accounted for 49% of the variance, versus 10% by the original version. In the modified model, the influence of psychosocial factors was moderately high, whilst the influence of HIV prevention information, motivation and perceived behavioural skills was moderately low, explaining in part the limited level of condom use behaviour. This study provides insights into social factors that should be taken into account in public health planning to promote safer sexual behaviour among Asian male street labourers.  相似文献   
9.

Objectives

The current study investigated the effects of two exercise interventions on cognitive function amongst breast cancer survivors.

Design

Pilot randomised-controlled trial.

Methods

Seventeen female cancer survivors (mean: 62.9 ± 7.8 years) were randomised into three groups: high-intensity interval training (HIIT, n = 6); moderate-intensity continuous training (MOD, n = 5); or wait-list control (CON, n = 6). The HIIT and MOD groups exercised on a cycle ergometer 3 days/week for 12-weeks. Primary outcomes were cognitive function assessments utilising CogState. Secondary outcomes were resting middle cerebral artery blood flow velocity, cerebrovascular reactivity and aerobic fitness (VO2peak). Data were analysed with General Linear Mixed Models and Cohen’s d effect sizes were calculated.

Results

All 17 participants who were randomised were available for follow-up analysis and adherence was similar for HIIT and MOD (78.7 ± 13.2% vs 79.4 ± 12.0%; p = 0.93). Although there were no significant differences in the cognitive and cerebrovascular outcomes, HIIT produced moderate to large positive effects in comparison to MOD and CON for outcomes including episodic memory, working memory, executive function, cerebral blood flow and cerebrovascular reactivity. HIIT significantly increased VO2peak by 19.3% (d = 1.28) and MOD had a non-significant 5.6% (d = 0.72) increase, compared to CON which had a 2.6% decrease.

Conclusions

This study provides preliminary evidence that HIIT may be an effective exercise intervention to improve cognitive performance, cerebrovascular function and aerobic fitness in breast cancer survivors. Considering the sample size is small, these results should be confirmed through larger clinical trials.  相似文献   
10.
Annals of Hematology - This study assessed treatment patterns and healthcare resource utilization (HRU) of patients with severe aplastic anemia (SAA) with insufficient response to immunosuppressive...  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