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   2895205篇
  免费   233278篇
  国内免费   5494篇
耳鼻咽喉   42733篇
儿科学   88423篇
妇产科学   78406篇
基础医学   409426篇
口腔科学   84135篇
临床医学   262155篇
内科学   561253篇
皮肤病学   58825篇
神经病学   242995篇
特种医学   116010篇
外国民族医学   1042篇
外科学   440286篇
综合类   72576篇
现状与发展   3篇
一般理论   1173篇
预防医学   233852篇
眼科学   69467篇
药学   216303篇
  4篇
中国医学   5374篇
肿瘤学   149536篇
  2018年   28620篇
  2016年   24546篇
  2015年   27884篇
  2014年   40243篇
  2013年   61448篇
  2012年   82736篇
  2011年   87209篇
  2010年   51338篇
  2009年   49078篇
  2008年   82749篇
  2007年   88645篇
  2006年   89278篇
  2005年   87149篇
  2004年   84358篇
  2003年   81459篇
  2002年   80184篇
  2001年   130024篇
  2000年   134513篇
  1999年   113912篇
  1998年   33484篇
  1997年   30559篇
  1996年   30133篇
  1995年   29136篇
  1994年   27448篇
  1993年   25577篇
  1992年   93027篇
  1991年   89791篇
  1990年   86903篇
  1989年   83724篇
  1988年   78023篇
  1987年   77026篇
  1986年   72877篇
  1985年   69946篇
  1984年   53449篇
  1983年   45717篇
  1982年   28242篇
  1981年   25247篇
  1980年   23765篇
  1979年   51274篇
  1978年   36327篇
  1977年   30605篇
  1976年   28599篇
  1975年   30334篇
  1974年   37522篇
  1973年   35869篇
  1972年   33638篇
  1971年   31078篇
  1970年   29404篇
  1969年   27646篇
  1968年   25149篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Cancer Causes & Control - Congenital malformations are strong risk factors for childhood cancer. Our objective was to determine whether cancer survival differs by birth defect status among...  相似文献   
22.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia.  相似文献   
23.
24.
Troppmair  Teresa  Egger  J.  Krösbacher  A.  Zanvettor  A.  Schinnerl  A.  Neumayr  A.  Baubin  M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall...  相似文献   
25.
26.
27.
28.
29.
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   
30.
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