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   31931篇
  免费   2397篇
  国内免费   94篇
耳鼻咽喉   366篇
儿科学   810篇
妇产科学   412篇
基础医学   4177篇
口腔科学   629篇
临床医学   2876篇
内科学   6716篇
皮肤病学   461篇
神经病学   3634篇
特种医学   1319篇
外国民族医学   3篇
外科学   4719篇
综合类   667篇
一般理论   66篇
预防医学   2796篇
眼科学   628篇
药学   1980篇
中国医学   20篇
肿瘤学   2143篇
  2023年   105篇
  2022年   157篇
  2021年   450篇
  2020年   263篇
  2019年   445篇
  2018年   576篇
  2017年   419篇
  2016年   489篇
  2015年   553篇
  2014年   848篇
  2013年   1337篇
  2012年   2046篇
  2011年   2176篇
  2010年   1162篇
  2009年   1108篇
  2008年   2069篇
  2007年   2203篇
  2006年   2172篇
  2005年   2368篇
  2004年   2094篇
  2003年   1926篇
  2002年   1953篇
  2001年   349篇
  2000年   277篇
  1999年   350篇
  1998年   426篇
  1997年   402篇
  1996年   372篇
  1995年   363篇
  1994年   293篇
  1993年   277篇
  1992年   250篇
  1991年   263篇
  1990年   245篇
  1989年   218篇
  1988年   187篇
  1987年   213篇
  1986年   176篇
  1985年   191篇
  1984年   237篇
  1983年   226篇
  1982年   279篇
  1981年   276篇
  1980年   230篇
  1979年   139篇
  1978年   150篇
  1977年   102篇
  1976年   124篇
  1975年   89篇
  1974年   115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.

Background  

There are no published utilities for the post-anesthesia state obtained by the standard gamble method (SG).  相似文献   
7.
8.
OBJECTIVE: Neighborhood sociodemographic characteristics may be important to the mental health of older adults who have decreased mobility and fewer resources. Our objective was to examine the association between neighborhood context and level of depressive symptomatology in older adults in a diverse geographic region of central North Carolina. METHODS: The sample included 2,998 adults 65 or older residing in 91 census tracts. Depressive symptoms were measured using the Center for Epidemiologic Studies-Depression scale (CES-D). Neighborhoods were characterized by five census-based characteristics: socioeconomic disadvantage, socioeconomic advantage, racial/ethnic heterogeneity, residential stability, and age structure. RESULTS: In ecologic level analyses, level of census tract socioeconomic disadvantage was associated with increased depressive symptoms. To determine whether neighborhood context was associated with depressive symptoms independently of individual characteristics, the authors used multilevel modeling. The authors examined the ability of each of five neighborhood (level 2) characteristics to predict a level 1 outcome (CES-D symptoms) controlling for the effects of individual (level 1) characteristics. Younger age, being widowed, lower income, and having some functional limitations were associated with increased depression symptoms conditional on census tract random effects. However, none of the neighborhood characteristics was significantly associated with depression symptoms, conditional on census tract random effects, either unadjusted or adjusted for individual characteristics. CONCLUSION: Any observed association between neighborhood sociodemographic characteristics and individual depressive symptoms in our sample may reflect the characteristics of the individuals who reside in the neighborhood rather than the neighborhood characteristics themselves. The use of multilevel modeling is important to separate these effects.  相似文献   
9.
This paper is a comprehensive review on the effect of bandaging, bracing, and neoprene sleeves on knee proprioception following anterior cruciate ligament (ACL) injury and reconstruction with a focus on studies that have measured joint position sense and threshold to detection of passive knee motion. Disruption of the ACL does not appear to alter joint position sense soon after injury, although there is evidence that in some subjects deterioration may occur over time. An ACL tear creates a deficit in the threshold to detection of passive knee motion soon after injury and in those with chronic tears. The magnitude of worsening is less then 1.0 degree of movement in flexion-extension and of questionable concern from a clinical and functional perspective. Application of a functional brace or neoprene sleeve to the ACL-deficient limb does not improve the threshold to detection of passive knee motion; however, application of an elastic bandage to a knee with an ACL tear improves joint position sense. Reconstruction of a torn ACL is associated with a deficit in the threshold to detection of passive knee motion, and during the first year of healing the use of a neoprene sleeve provides improvement. Two years following ACL reconstruction there is no deficit in the threshold to detection of passive knee motion and the use of a brace has no effect on this outcome.  相似文献   
10.
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