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   1976319篇
  免费   150784篇
  国内免费   3321篇
耳鼻咽喉   27338篇
儿科学   61526篇
妇产科学   55884篇
基础医学   291146篇
口腔科学   56819篇
临床医学   181023篇
内科学   378691篇
皮肤病学   41394篇
神经病学   160087篇
特种医学   75523篇
外国民族医学   420篇
外科学   291629篇
综合类   46815篇
现状与发展   4篇
一般理论   818篇
预防医学   161323篇
眼科学   45693篇
药学   146010篇
  6篇
中国医学   3436篇
肿瘤学   104839篇
  2018年   19721篇
  2016年   16811篇
  2015年   19467篇
  2014年   27417篇
  2013年   41997篇
  2012年   56834篇
  2011年   60345篇
  2010年   35106篇
  2009年   33395篇
  2008年   56920篇
  2007年   61310篇
  2006年   60752篇
  2005年   59657篇
  2004年   57702篇
  2003年   55363篇
  2002年   53688篇
  2001年   83902篇
  2000年   85425篇
  1999年   72355篇
  1998年   21228篇
  1997年   19338篇
  1996年   19627篇
  1995年   18402篇
  1994年   17427篇
  1993年   16352篇
  1992年   59232篇
  1991年   58077篇
  1990年   56555篇
  1989年   54734篇
  1988年   51108篇
  1987年   50224篇
  1986年   47796篇
  1985年   45627篇
  1984年   35093篇
  1983年   30467篇
  1982年   18642篇
  1981年   17066篇
  1979年   34551篇
  1978年   25290篇
  1977年   21095篇
  1976年   19489篇
  1975年   21222篇
  1974年   25994篇
  1973年   25308篇
  1972年   24136篇
  1971年   22369篇
  1970年   21281篇
  1969年   20250篇
  1968年   18607篇
  1967年   16900篇
排序方式: 共有10000条查询结果,搜索用时 15 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