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   1355164篇
  免费   105429篇
  国内免费   2165篇
耳鼻咽喉   19314篇
儿科学   46652篇
妇产科学   36917篇
基础医学   194569篇
口腔科学   36086篇
临床医学   118799篇
内科学   273429篇
皮肤病学   29236篇
神经病学   108349篇
特种医学   54248篇
外国民族医学   700篇
外科学   206464篇
综合类   27571篇
现状与发展   2篇
一般理论   455篇
预防医学   102681篇
眼科学   29303篇
药学   99937篇
  2篇
中国医学   2605篇
肿瘤学   75439篇
  2019年   10449篇
  2018年   14710篇
  2017年   11165篇
  2016年   12327篇
  2015年   13965篇
  2014年   19262篇
  2013年   29379篇
  2012年   40424篇
  2011年   42574篇
  2010年   25736篇
  2009年   24447篇
  2008年   40612篇
  2007年   43319篇
  2006年   43540篇
  2005年   42290篇
  2004年   41198篇
  2003年   39815篇
  2002年   38929篇
  2001年   66261篇
  2000年   68810篇
  1999年   58495篇
  1998年   16185篇
  1997年   14627篇
  1996年   15001篇
  1995年   14173篇
  1994年   13424篇
  1993年   12476篇
  1992年   46103篇
  1991年   44905篇
  1990年   43561篇
  1989年   41431篇
  1988年   38029篇
  1987年   37370篇
  1986年   34735篇
  1985年   33320篇
  1984年   24900篇
  1983年   20921篇
  1982年   12167篇
  1981年   11110篇
  1979年   22015篇
  1978年   15188篇
  1977年   12894篇
  1976年   11985篇
  1975年   13020篇
  1974年   15100篇
  1973年   14507篇
  1972年   13351篇
  1971年   12097篇
  1970年   11347篇
  1969年   10287篇
排序方式: 共有10000条查询结果,搜索用时 203 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