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   17059篇
  免费   3113篇
  国内免费   280篇
耳鼻咽喉   845篇
儿科学   713篇
妇产科学   294篇
基础医学   846篇
口腔科学   513篇
临床医学   2233篇
内科学   4031篇
皮肤病学   588篇
神经病学   1668篇
特种医学   700篇
外科学   4068篇
综合类   247篇
现状与发展   2篇
一般理论   1篇
预防医学   1062篇
眼科学   640篇
药学   488篇
中国医学   26篇
肿瘤学   1487篇
  2024年   103篇
  2023年   551篇
  2022年   243篇
  2021年   540篇
  2020年   848篇
  2019年   355篇
  2018年   848篇
  2017年   757篇
  2016年   940篇
  2015年   890篇
  2014年   1217篇
  2013年   1364篇
  2012年   845篇
  2011年   777篇
  2010年   924篇
  2009年   1076篇
  2008年   727篇
  2007年   649篇
  2006年   644篇
  2005年   472篇
  2004年   412篇
  2003年   360篇
  2002年   315篇
  2001年   283篇
  2000年   196篇
  1999年   256篇
  1998年   307篇
  1997年   309篇
  1996年   342篇
  1995年   308篇
  1994年   207篇
  1993年   154篇
  1992年   184篇
  1991年   197篇
  1990年   127篇
  1989年   177篇
  1988年   148篇
  1987年   121篇
  1986年   123篇
  1985年   127篇
  1984年   102篇
  1983年   97篇
  1982年   88篇
  1981年   57篇
  1980年   66篇
  1979年   60篇
  1978年   63篇
  1977年   55篇
  1975年   64篇
  1972年   52篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
ObjectiveThe objective of the study is to evaluate cardiac risk factors and risk scores for prediction of coronary artery disease (CAD) and adverse outcomes in an emergency department (ED) population judged to be at low to intermediate risk for acute coronary syndrome.MethodsInformed consent was obtained from consecutive ED patients who presented with chest pain and were evaluated with coronary computed tomography angiography (cCTA). Cardiac risk factors, clinical presentation, electrocardiogram, and laboratory studies were recorded; the Thrombolysis in Myocardial Infarction (TIMI) and Global Registry of Acute Coronary Events (GRACE) scores were tabulated. Coronary computed tomography angiography findings were rated on a 6-level plaque burden scale and classified for significant CAD (stenosis ≥ 50%). Adverse cardiovascular outcomes were recorded at 30 days.ResultsAmong 250 patients evaluated by cCTA, 143 (57%) had no CAD, 64 (26%) demonstrated minimal plaque (< 30% stenosis), 26 (10%) demonstrated mild plaque (< 50% stenosis), 9 (4%) demonstrated moderate single vessel disease (50%-70% stenosis), 2 (1%) demonstrated moderate multivessel disease, and 6 (2%) demonstrated severe disease (> 70% stenosis). Six patients developed adverse cardiovascular outcomes. Among traditional cardiac risk factors, only age (older) and sex (male) were significant independent predictors of CAD. Correlation with CAD was poor for the TIMI (r = 0.12) and GRACE (r = 0.09-0.23) scores. The TIMI and GRACE scores were not useful to predict adverse outcomes. Coronary computed tomography angiography identified severe CAD in all subjects with adverse outcomes.ConclusionAmong ED patients who present with chest pain judged to be at low to intermediate risk for acute coronary syndrome, traditional risk factors are not useful to stratify risk for CAD and adverse outcomes. Coronary computed tomography angiography is an excellent predictor of CAD and outcome.  相似文献   
152.
153.
This article outlines the importance of assessing both within-child and environmental strengths for children and adolescents admitted to residential treatment facilities (RTFs). Discussed are the theoretical underpinnings behind strength-based assessment, as well as a number of organizations and initiatives that aim at raising the bar for children's care, creating a holistic viewpoint. Assessments such as the BASC-2, ASEBA, and Vineland-II are well-established measures that have moved to meet these demands, and measures like the BERS-2, RSCA, and DESSA have an overt strengths orientation. The CASA and the DCASC are omnibus strengths measures that can be utilized to fill the “intake gap.”  相似文献   
154.
155.
156.
157.
158.
159.
160.

Introduction  

With the resurgence of resurfacing hip arthroplasty complications such as femoral neck fracture and thinning have been identified. We therefore conducted a radiological and biomechanical evaluation of factors affecting femoral neck resorption following resurfacing hip arthroplasty (RHA).  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