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   1483696篇
  免费   102065篇
  国内免费   2073篇
耳鼻咽喉   19959篇
儿科学   51685篇
妇产科学   38658篇
基础医学   205280篇
口腔科学   35668篇
临床医学   125599篇
内科学   295349篇
皮肤病学   29286篇
神经病学   119778篇
特种医学   61007篇
外国民族医学   660篇
外科学   230177篇
综合类   29761篇
现状与发展   1篇
一般理论   390篇
预防医学   115676篇
眼科学   30992篇
药学   106167篇
  2篇
中国医学   3121篇
肿瘤学   88618篇
  2019年   9713篇
  2018年   36213篇
  2017年   28359篇
  2016年   32437篇
  2015年   14001篇
  2014年   18749篇
  2013年   27967篇
  2012年   44416篇
  2011年   61082篇
  2010年   42576篇
  2009年   34528篇
  2008年   58745篇
  2007年   64665篇
  2006年   41296篇
  2005年   42393篇
  2004年   42970篇
  2003年   43311篇
  2002年   40328篇
  2001年   64516篇
  2000年   67275篇
  1999年   56778篇
  1998年   15555篇
  1997年   14228篇
  1996年   14436篇
  1995年   13705篇
  1994年   13015篇
  1993年   11982篇
  1992年   44698篇
  1991年   43655篇
  1990年   42420篇
  1989年   40257篇
  1988年   37012篇
  1987年   36376篇
  1986年   33719篇
  1985年   32390篇
  1984年   24212篇
  1983年   20345篇
  1982年   11825篇
  1981年   10710篇
  1979年   21440篇
  1978年   14893篇
  1977年   12557篇
  1976年   11760篇
  1975年   12634篇
  1974年   14699篇
  1973年   14132篇
  1972年   12947篇
  1971年   11730篇
  1970年   11081篇
  1969年   10062篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
2.
Die Anaesthesiologie - Die Anlage einer Magensonde im OP oder auf einer Intensivstation (ITS) stellt eine alltäglich durchgeführte Prozedur dar. Obwohl die Sonde häufig durch...  相似文献   
3.
4.
5.
6.
7.
8.
Patient navigation is a strategy for overcoming barriers to reduce disparities and to improve access and outcomes. The aim of this umbrella review was to identify, critically appraise, synthesize, and present the best available evidence to inform policy and planning regarding patient navigation across the cancer continuum. Systematic reviews examining navigation in cancer care were identified in the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), Epistemonikos, and Prospective Register of Systematic Reviews (PROSPERO) databases and in the gray literature from January 1, 2012, to April 19, 2022. Data were screened, extracted, and appraised independently by two authors. The JBI Critical Appraisal Checklist for Systematic Review and Research Syntheses was used for quality appraisal. Emerging literature up to May 25, 2022, was also explored to capture primary research published beyond the coverage of included systematic reviews. Of the 2062 unique records identified, 61 systematic reviews were included. Fifty-four reviews were quantitative or mixed-methods reviews, reporting on the effectiveness of cancer patient navigation, including 12 reviews reporting costs or cost-effectiveness outcomes. Seven qualitative reviews explored navigation needs, barriers, and experiences. In addition, 53 primary studies published since 2021 were included. Patient navigation is effective in improving participation in cancer screening and reducing the time from screening to diagnosis and from diagnosis to treatment initiation. Emerging evidence suggests that patient navigation improves quality of life and patient satisfaction with care in the survivorship phase and reduces hospital readmission in the active treatment and survivorship care phases. Palliative care data were extremely limited. Economic evaluations from the United States suggest the potential cost-effectiveness of navigation in screening programs.  相似文献   
9.
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   
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