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   2551238篇
  免费   197312篇
  国内免费   3871篇
耳鼻咽喉   34596篇
儿科学   84221篇
妇产科学   72229篇
基础医学   370206篇
口腔科学   74545篇
临床医学   232445篇
内科学   492825篇
皮肤病学   55185篇
神经病学   206216篇
特种医学   98661篇
外国民族医学   713篇
外科学   374861篇
综合类   59494篇
现状与发展   5篇
一般理论   1061篇
预防医学   205434篇
眼科学   58437篇
药学   190840篇
  9篇
中国医学   4481篇
肿瘤学   135957篇
  2018年   25223篇
  2016年   21634篇
  2015年   25066篇
  2014年   34567篇
  2013年   53085篇
  2012年   71780篇
  2011年   76267篇
  2010年   44700篇
  2009年   42899篇
  2008年   72436篇
  2007年   76951篇
  2006年   77278篇
  2005年   75338篇
  2004年   73517篇
  2003年   70459篇
  2002年   68620篇
  2001年   113909篇
  2000年   117247篇
  1999年   99591篇
  1998年   27915篇
  1997年   25396篇
  1996年   25669篇
  1995年   24733篇
  1994年   23123篇
  1993年   21782篇
  1992年   81555篇
  1991年   79640篇
  1990年   77700篇
  1989年   75258篇
  1988年   69845篇
  1987年   68737篇
  1986年   65608篇
  1985年   62995篇
  1984年   47523篇
  1983年   41410篇
  1982年   24478篇
  1981年   22067篇
  1980年   20797篇
  1979年   45472篇
  1978年   32312篇
  1977年   27226篇
  1976年   25562篇
  1975年   27182篇
  1974年   33143篇
  1973年   32206篇
  1972年   29953篇
  1971年   28106篇
  1970年   26127篇
  1969年   24746篇
  1968年   22722篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
4.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
5.

Objectives

Expedient extubation after cardiac surgery has been associated with improved outcomes, leading to postoperative extubation frequently during overnight hours. However, recent evidence in a mixed medical-surgical intensive care unit population demonstrated worse outcomes with overnight extubation. This study investigated the impact of overnight extubation in a statewide, multicenter Society of Thoracic Surgeons database.

Methods

Records from 39,812 patients undergoing coronary artery bypass grafting or valve operations (2008-2016) and extubated within 24 hours were stratified according to extubation time between 06:00 and 18:00 (day) or between 18:00 and 6:00 (overnight). Outcomes including reintubation, mortality, and composite morbidity-mortality were evaluated using hierarchical regression models adjusted for Society of Thoracic Surgeons predictive risk scores. To further analyze extubation during the night, a subanalysis stratified patients into 3 groups: 06:00 to 18:00, 18:00 to 24:00, and 24:00 to 06:00.

Results

A total of 20,758 patients were extubated overnight (52.1%) and were slightly older (median age 66 vs 65 years, P < .001) with a longer duration of ventilation (4 vs 7 hours, P < .001). Day and overnight extubation were associated with equivalent operative mortality (1.7% vs 1.7%, P = .880), reintubation (3.7% vs 3.4%, P = .141), and composite morbidity-mortality (8.2% vs 8.0%, P = .314). After risk adjustment, overnight extubation was not associated with any difference in reintubation, mortality, or composite morbidity-mortality. On subanalysis, those extubated between 24:00 and 06:00 exhibited increased composite morbidity-mortality (odds ratio, 1.18; P = .001) but no difference in reintubation or mortality.

Conclusions

Extubation overnight was not associated with increased mortality or reintubation. These results suggest that in the appropriate clinical setting, it is safe to routinely extubate cardiac surgery patients overnight.  相似文献   
6.
7.
8.
9.
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