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   2286983篇
  免费   167240篇
  国内免费   3356篇
耳鼻咽喉   31604篇
儿科学   75604篇
妇产科学   65757篇
基础医学   336495篇
口腔科学   64521篇
临床医学   205136篇
内科学   443843篇
皮肤病学   48467篇
神经病学   181379篇
特种医学   87160篇
外国民族医学   602篇
外科学   338896篇
综合类   48159篇
现状与发展   4篇
一般理论   823篇
预防医学   179955篇
眼科学   52253篇
药学   171303篇
  7篇
中国医学   4091篇
肿瘤学   121520篇
  2018年   22768篇
  2016年   19167篇
  2015年   22256篇
  2014年   30747篇
  2013年   46977篇
  2012年   64204篇
  2011年   68630篇
  2010年   40132篇
  2009年   38301篇
  2008年   65551篇
  2007年   70561篇
  2006年   70894篇
  2005年   69485篇
  2004年   66881篇
  2003年   64303篇
  2002年   63019篇
  2001年   100034篇
  2000年   102480篇
  1999年   86854篇
  1998年   24992篇
  1997年   22432篇
  1996年   22886篇
  1995年   21719篇
  1994年   20462篇
  1993年   18967篇
  1992年   69974篇
  1991年   69019篇
  1990年   67737篇
  1989年   65638篇
  1988年   61145篇
  1987年   60040篇
  1986年   57274篇
  1985年   54524篇
  1984年   41098篇
  1983年   35791篇
  1982年   21433篇
  1981年   19294篇
  1979年   39439篇
  1978年   28325篇
  1977年   24063篇
  1976年   22554篇
  1975年   24589篇
  1974年   29436篇
  1973年   28658篇
  1972年   27207篇
  1971年   25364篇
  1970年   23760篇
  1969年   22707篇
  1968年   21281篇
  1967年   18955篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
1.
2.
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   
3.
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   
4.

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   
5.
6.
7.
8.
9.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
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