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   1959562篇
  免费   149564篇
  国内免费   3291篇
耳鼻咽喉   27130篇
儿科学   60946篇
妇产科学   55487篇
基础医学   288940篇
口腔科学   56315篇
临床医学   178945篇
内科学   375956篇
皮肤病学   41144篇
神经病学   158597篇
特种医学   75001篇
外国民族医学   419篇
外科学   288784篇
综合类   46473篇
现状与发展   4篇
一般理论   805篇
预防医学   159622篇
眼科学   45253篇
药学   145131篇
  6篇
中国医学   3434篇
肿瘤学   104025篇
  2018年   19383篇
  2016年   16581篇
  2015年   19207篇
  2014年   26947篇
  2013年   41325篇
  2012年   55930篇
  2011年   59382篇
  2010年   34519篇
  2009年   32904篇
  2008年   56114篇
  2007年   60429篇
  2006年   59919篇
  2005年   58763篇
  2004年   56892篇
  2003年   54598篇
  2002年   52951篇
  2001年   83549篇
  2000年   85072篇
  1999年   72020篇
  1998年   21010篇
  1997年   19193篇
  1996年   19467篇
  1995年   18264篇
  1994年   17287篇
  1993年   16225篇
  1992年   58939篇
  1991年   57817篇
  1990年   56330篇
  1989年   54504篇
  1988年   50896篇
  1987年   50034篇
  1986年   47592篇
  1985年   45424篇
  1984年   34936篇
  1983年   30308篇
  1982年   18510篇
  1981年   16923篇
  1979年   34361篇
  1978年   25157篇
  1977年   20992篇
  1976年   19388篇
  1975年   21125篇
  1974年   25875篇
  1973年   25189篇
  1972年   24041篇
  1971年   22271篇
  1970年   21202篇
  1969年   20188篇
  1968年   18563篇
  1967年   16862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