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   7984篇
  免费   415篇
  国内免费   125篇
耳鼻咽喉   21篇
儿科学   389篇
妇产科学   301篇
基础医学   1005篇
口腔科学   127篇
临床医学   659篇
内科学   920篇
皮肤病学   210篇
神经病学   939篇
特种医学   114篇
外国民族医学   2篇
外科学   677篇
综合类   1065篇
预防医学   335篇
眼科学   136篇
药学   594篇
  1篇
中国医学   130篇
肿瘤学   899篇
  2024年   9篇
  2023年   62篇
  2022年   77篇
  2021年   183篇
  2020年   114篇
  2019年   570篇
  2018年   456篇
  2017年   293篇
  2016年   212篇
  2015年   178篇
  2014年   354篇
  2013年   303篇
  2012年   375篇
  2011年   419篇
  2010年   391篇
  2009年   347篇
  2008年   329篇
  2007年   329篇
  2006年   258篇
  2005年   206篇
  2004年   179篇
  2003年   170篇
  2002年   167篇
  2001年   123篇
  2000年   88篇
  1999年   85篇
  1998年   62篇
  1997年   70篇
  1996年   63篇
  1995年   49篇
  1994年   51篇
  1993年   29篇
  1992年   32篇
  1991年   34篇
  1990年   26篇
  1989年   21篇
  1988年   15篇
  1987年   13篇
  1986年   14篇
  1985年   208篇
  1984年   361篇
  1983年   193篇
  1982年   207篇
  1981年   251篇
  1980年   149篇
  1979年   174篇
  1978年   96篇
  1977年   75篇
  1976年   33篇
  1975年   11篇
排序方式: 共有8524条查询结果,搜索用时 15 毫秒
991.
Gary W. Small 《Psychosomatics》1981,22(10):860-869
The author describes a stress response syndrome prevalent among physicians in training, the house officer stress syndrome. Episodic cognitive impairment, chronic anger, pervasive cynicism, and family discord occur in nearly all cases, usually in a benign form. Severely affected house officers, however, may also suffer from major depression, suicidal ideation, and substance abuse. Possible contributing stresses include sleep deprivation, excessive work load, patient care responsibility, perpetually changing work conditions, and competition. Approaches to prevention and management of the malignant form of the syn drome include improved work conditions, increased group responsibility, and psychiatric referral.  相似文献   
992.
Individual differences in EEG alpha rhythm responsivity were examined with respect to: (1) consistency of response across cognitive tasks; (2) relationships to cardiovascular responsivity; and (3) relationships to dispositional variables. Inter-task correlations revealed a significant degree of stability in subjects' alpha responses to four ‘sensory rejection’ tasks: mental arithmetic, time estimation and imagining oneself as cold or warm. Individuals evidencing greater suppression of alpha activity during mental arithmetic also displayed greater heart rate increase and greater digital vasoconstriction, as well as obtaining higher scores on the Activity subscale of the EASI-III Temperament Survey and on the ‘Hard Striving’ subscale of the Jenkins Activity Survey for Health Prediction, a measure of the Coronary-Prone Behavior Pattern. Alpha responsivity in the time estimation and warm imagery tasks was also associated with greater heart rate increase. The results suggest that alpha responsivity is related to individual differences affecting one's attentiveness or involvement in experimental tasks.  相似文献   
993.
The authors address the complex psychiatric problems relating to the termination of fertility—either voluntary or involuntary. Although adverse reactions are relatively rare, it is important for the medical team to be aware of the normal and abnormal reactions to sterilization procedures and to provide prompt and adequate intervention. To illustrate the diversity of problems encountered by the liaison psychiatrist working in this area, six cases are presented and discussed.  相似文献   
994.
995.
996.
997.
998.
999.
1000.
Eighty-one sedentary but healthy men aged 30–55 participated in a 1 yr randomized study of the effects of exercise on plasma lipoprotein concentrations. Forty-eight were assigned to a running program, while 33 remained as sedentary controls (an approximately 3:2 ratio). After 1 yr the running group had become significantly fitter and leaner than the control group. Lipoprotein concentration changes in the runners (vs. controls) uniformly favored reduced risk of coronary heart disease, but were not significant when all 46 participants with complete data were included. However, the 25 men who averaged at least eight miles (12.9 kilometers) per wk of running increased their plasma high-density-lipoprotein (HDL) cholesterol level by 4.4 mg/dl (p = 0.045) and their HDL2 mass level by 33 mg/dl (p = 0.059), vs. controls. Significant correlations were found for distance run per wk vs. change in plasma HDL-cholesterol (r = 0.48), HDL2 (r = 0.41), and low-density-lipoprotein cholesterol (r = ?0.31). Changes in percent body fat and in HDL-cholesterol were correlated (r = ?0.47) in runners. There appears to be a threshold at about 8 miles per wk above which a 1-yr running program leads to beneficial lipoprotein changes.  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