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   1289754篇
  免费   100762篇
  国内免费   2035篇
耳鼻咽喉   18680篇
儿科学   45220篇
妇产科学   35381篇
基础医学   183255篇
口腔科学   33855篇
临床医学   112190篇
内科学   260964篇
皮肤病学   28277篇
神经病学   101156篇
特种医学   51760篇
外国民族医学   660篇
外科学   198838篇
综合类   27392篇
现状与发展   1篇
一般理论   380篇
预防医学   96257篇
眼科学   28556篇
药学   95818篇
  2篇
中国医学   2486篇
肿瘤学   71423篇
  2019年   9608篇
  2018年   13740篇
  2017年   10381篇
  2016年   11306篇
  2015年   12808篇
  2014年   17823篇
  2013年   27039篇
  2012年   37256篇
  2011年   39190篇
  2010年   23510篇
  2009年   22348篇
  2008年   37444篇
  2007年   40092篇
  2006年   40301篇
  2005年   39178篇
  2004年   38250篇
  2003年   36999篇
  2002年   36267篇
  2001年   64296篇
  2000年   66817篇
  1999年   56666篇
  1998年   15240篇
  1997年   13862篇
  1996年   14286篇
  1995年   13543篇
  1994年   12830篇
  1993年   11788篇
  1992年   44668篇
  1991年   43611篇
  1990年   42317篇
  1989年   40218篇
  1988年   36960篇
  1987年   36327篇
  1986年   33682篇
  1985年   32366篇
  1984年   24199篇
  1983年   20293篇
  1982年   11724篇
  1981年   10683篇
  1979年   21372篇
  1978年   14848篇
  1977年   12526篇
  1976年   11701篇
  1975年   12636篇
  1974年   14686篇
  1973年   14177篇
  1972年   13005篇
  1971年   11752篇
  1970年   11065篇
  1969年   10036篇
排序方式: 共有10000条查询结果,搜索用时 250 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.
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