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   4187601篇
  免费   307200篇
  国内免费   10240篇
耳鼻咽喉   58843篇
儿科学   140322篇
妇产科学   116863篇
基础医学   590275篇
口腔科学   117750篇
临床医学   384216篇
内科学   808323篇
皮肤病学   97176篇
神经病学   340011篇
特种医学   160730篇
外国民族医学   1623篇
外科学   629763篇
综合类   93847篇
现状与发展   9篇
一般理论   1656篇
预防医学   328694篇
眼科学   97425篇
药学   307317篇
  37篇
中国医学   8711篇
肿瘤学   221450篇
  2019年   32744篇
  2018年   47041篇
  2017年   36060篇
  2016年   40931篇
  2015年   45727篇
  2014年   63363篇
  2013年   95905篇
  2012年   128478篇
  2011年   135988篇
  2010年   81913篇
  2009年   77477篇
  2008年   126179篇
  2007年   134494篇
  2006年   135974篇
  2005年   133781篇
  2004年   129630篇
  2003年   123869篇
  2002年   118136篇
  2001年   193272篇
  2000年   198897篇
  1999年   168184篇
  1998年   49548篇
  1997年   43846篇
  1996年   43643篇
  1995年   42028篇
  1994年   38740篇
  1993年   36397篇
  1992年   131862篇
  1991年   127885篇
  1990年   124421篇
  1989年   120172篇
  1988年   110574篇
  1987年   108495篇
  1986年   101938篇
  1985年   97860篇
  1984年   73655篇
  1983年   62672篇
  1982年   37354篇
  1981年   33616篇
  1979年   66565篇
  1978年   47129篇
  1977年   40043篇
  1976年   37340篇
  1975年   39857篇
  1974年   47452篇
  1973年   45476篇
  1972年   42877篇
  1971年   39519篇
  1970年   37168篇
  1969年   34851篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
European Surgery - Treatment of pilonidal sinus disease (PSD) requires a tailored approach. A national guideline was published in 2014. The current status of surgical PSD therapy...  相似文献   
52.
In this paper we present a coupled Finite Element Method – Boundary Element Method (FEM-BEM) approach for the solution of the free-boundary axi-symmetric plasma equilibrium problem. The proposed method, obtained from an improvement of the Hagenow-Lackner coupling method, allows to efficiently model the equilibrium problem in unbounded domains by discretizing only the plasma region; the external conductors can be modelled either as 2D or 3D models, according to the problem of interest. The paper explores different iterative methods for the solution of the nonlinear Grad-Shafranov equation, such as Picard, Newton-Raphson and Newton-Krylov, in order to provide a robust and reliable tool, able to handle large-scale problems (e.g. high resolution equilibria). This method has been implemented in the FRIDA code (FRee-boundary Integro-Differential Axisimmetric – https://github. om/matteobonotto/ FRIDA), together with a suitable Adaptive Integration Technique (AIT) for the computation of the source term. FRIDA has been successfully tested and validated against experimental data from RFX-mod device, and numerical equilibria of an ITER-like device.  相似文献   
53.
54.
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   
55.
56.
Journal of Neuro-Oncology - Adjuvant radiation is often used in patients with low grade gliomas with high-risk characteristics with a recommended dose of 45–54&nbsp;Gy. We used the...  相似文献   
57.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36&nbsp;weeks gestational age)...  相似文献   
58.
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   
59.
60.
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