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   1374756篇
  免费   106664篇
  国内免费   2188篇
耳鼻咽喉   19323篇
儿科学   47266篇
妇产科学   37019篇
基础医学   197573篇
口腔科学   36438篇
临床医学   119733篇
内科学   277083篇
皮肤病学   29496篇
神经病学   110565篇
特种医学   55096篇
外国民族医学   675篇
外科学   208623篇
综合类   27485篇
现状与发展   2篇
一般理论   457篇
预防医学   106732篇
眼科学   29533篇
药学   100771篇
  2篇
中国医学   2633篇
肿瘤学   77103篇
  2019年   10741篇
  2018年   15193篇
  2017年   11662篇
  2016年   12824篇
  2015年   14519篇
  2014年   20129篇
  2013年   30076篇
  2012年   41939篇
  2011年   44102篇
  2010年   26048篇
  2009年   25074篇
  2008年   41902篇
  2007年   44629篇
  2006年   44711篇
  2005年   43383篇
  2004年   41823篇
  2003年   40473篇
  2002年   39318篇
  2001年   66996篇
  2000年   69394篇
  1999年   59042篇
  1998年   16348篇
  1997年   14801篇
  1996年   15251篇
  1995年   14310篇
  1994年   13567篇
  1993年   12532篇
  1992年   46427篇
  1991年   45142篇
  1990年   43816篇
  1989年   41641篇
  1988年   38324篇
  1987年   37507篇
  1986年   34830篇
  1985年   33457篇
  1984年   24984篇
  1983年   21008篇
  1982年   12137篇
  1981年   11062篇
  1979年   22017篇
  1978年   15218篇
  1977年   12898篇
  1976年   11984篇
  1975年   12961篇
  1974年   15020篇
  1973年   14487篇
  1972年   13308篇
  1971年   12071篇
  1970年   11340篇
  1969年   10279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.
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