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   4058篇
  免费   278篇
  国内免费   3篇
耳鼻咽喉   68篇
儿科学   137篇
妇产科学   73篇
基础医学   611篇
口腔科学   73篇
临床医学   527篇
内科学   660篇
皮肤病学   38篇
神经病学   311篇
特种医学   240篇
外国民族医学   1篇
外科学   726篇
综合类   37篇
一般理论   1篇
预防医学   309篇
眼科学   40篇
药学   246篇
中国医学   2篇
肿瘤学   239篇
  2023年   35篇
  2022年   41篇
  2021年   67篇
  2020年   69篇
  2019年   91篇
  2018年   79篇
  2017年   73篇
  2016年   95篇
  2015年   94篇
  2014年   125篇
  2013年   158篇
  2012年   205篇
  2011年   236篇
  2010年   138篇
  2009年   108篇
  2008年   206篇
  2007年   211篇
  2006年   212篇
  2005年   176篇
  2004年   167篇
  2003年   138篇
  2002年   150篇
  2001年   90篇
  2000年   87篇
  1999年   60篇
  1998年   34篇
  1997年   35篇
  1992年   46篇
  1991年   41篇
  1990年   51篇
  1989年   50篇
  1988年   55篇
  1987年   46篇
  1986年   52篇
  1985年   56篇
  1984年   53篇
  1983年   35篇
  1982年   29篇
  1981年   29篇
  1979年   32篇
  1977年   33篇
  1976年   26篇
  1975年   28篇
  1974年   28篇
  1973年   33篇
  1972年   29篇
  1971年   26篇
  1970年   35篇
  1969年   35篇
  1968年   27篇
排序方式: 共有4339条查询结果,搜索用时 0 毫秒
51.
neurogenetics - Monoamine neurotransmitter disorders present predominantly with neurologic features, including dystonic or dyskinetic cerebral palsy and movement disorders. Genetic conditions that...  相似文献   
52.
53.
54.
55.
The study investigated the quality of interactions between childcare providers and toddlers during a lunch in childcare centres. Meals in childcare centres are semi-structured adult-led situations where the children not only eat, but are also provided with opportunities for implicit learning and interactions. Participants were 13 toddlers aged about 18 months in 11 different childcare centres in a Norwegian municipality. Video recordings were analysed for organization and structure, relational climate and childcare provider–child interactions, weighting provider sensitivity, language support and facilitated exploration. Findings indicated good quality regarding the organization of meals and relational climate in about half of the centres. Sensitivity, language support and facilitated exploration showed low quality across the different centres and are a cause for concern. Implications of the findings are discussed.  相似文献   
56.
European Child & Adolescent Psychiatry - The Incredible Years Teacher Classroom Management (IY TCM) programme has shown promise in reducing behaviour problems among high-risk children in...  相似文献   
57.
58.
The CNAP technology (CNSystems Medizintechnik AG, Graz, Austria) allows continuous noninvasive arterial pressure waveform recording based on the volume clamp method and estimation of cardiac output (CO) by pulse contour analysis. We compared CNAP-derived CO measurements (CNCO) with intermittent invasive CO measurements (pulmonary artery catheter; PAC-CO) in postoperative cardiothoracic surgery patients. In 51 intensive care unit patients after cardiothoracic surgery, we measured PAC-CO (criterion standard) and CNCO at three different time points. We conducted two separate comparative analyses: (1) CNCO auto-calibrated to biometric patient data (CNCObio) versus PAC-CO and (2) CNCO calibrated to the first simultaneously measured PAC-CO value (CNCOcal) versus PAC-CO. The agreement between the two methods was statistically assessed by Bland–Altman analysis and the percentage error. In a subgroup of patients, a passive leg raising maneuver was performed for clinical indications and we present the changes in PAC-CO and CNCO in four-quadrant plots (exclusion zone 0.5 L/min) in order to evaluate the trending ability of CNCO. The mean difference between CNCObio and PAC-CO was +0.5 L/min (standard deviation?±?1.3 L/min; 95% limits of agreement ?1.9 to +3.0 L/min). The percentage error was 49%. The concordance rate was 100%. For CNCOcal, the mean difference was ?0.3 L/min (±0.5 L/min; ?1.2 to +0.7 L/min) with a percentage error of 19%. In this clinical study in cardiothoracic surgery patients, CNCOcal showed good agreement when compared with PAC-CO. For CNCObio, we observed a higher percentage error and good trending ability (concordance rate 100%).  相似文献   
59.
This study explores country- and gender-stratified educational differences in depression among older adults from 10 European countries. We examine inequalities in both absolute (prevalence differences) and relative (odds ratios) terms and in bivariate and multivariate models. We use cross-sectional, nationally representative data from the generations and gender survey. The analysis comprises 27,331 Europeans aged 60–80. Depression is measured with a seven-item version of the Center for Epidemiologic Studies Depression scale. Findings show considerable between-country heterogeneity in late-life depression. An East–West gradient is evident, with rates of depression up to three times higher in Eastern European than in Scandinavian countries. Rates are about twice as high among women than men in all countries. Findings reveal marked absolute educational gaps in depression in all countries, yet the gaps are larger in weaker welfare states. This pattern is less pronounced for the relative inequalities, especially for women. Some countries observe similar relative inequalities but vastly different absolute inequalities. We argue that the absolute differences are more important for social policy development and evaluation. Educational gradients in depression are strongly mediated by individual-level health and financial variables. Socioeconomic variation in late-life depression is greater in countries with poorer economic development and welfare programs.  相似文献   
60.
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