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   1549419篇
  免费   108246篇
  国内免费   2372篇
耳鼻咽喉   20933篇
儿科学   53497篇
妇产科学   39665篇
基础医学   211590篇
口腔科学   37200篇
临床医学   133777篇
内科学   309567篇
皮肤病学   30354篇
神经病学   126236篇
特种医学   63211篇
外国民族医学   662篇
外科学   238949篇
综合类   31076篇
现状与发展   2篇
一般理论   542篇
预防医学   122500篇
眼科学   33158篇
药学   111433篇
  4篇
中国医学   3202篇
肿瘤学   92479篇
  2019年   10877篇
  2018年   35649篇
  2017年   27651篇
  2016年   30842篇
  2015年   15295篇
  2014年   20840篇
  2013年   31598篇
  2012年   49201篇
  2011年   64776篇
  2010年   44310篇
  2009年   36479篇
  2008年   61732篇
  2007年   66793篇
  2006年   47286篇
  2005年   48058篇
  2004年   47982篇
  2003年   47628篇
  2002年   44842篇
  2001年   65267篇
  2000年   67676篇
  1999年   57630篇
  1998年   16830篇
  1997年   15209篇
  1996年   15273篇
  1995年   14561篇
  1994年   13677篇
  1993年   12700篇
  1992年   45251篇
  1991年   44173篇
  1990年   42906篇
  1989年   40738篇
  1988年   37457篇
  1987年   36761篇
  1986年   34130篇
  1985年   32903篇
  1984年   24911篇
  1983年   21054篇
  1982年   12826篇
  1981年   11676篇
  1980年   10436篇
  1979年   21779篇
  1978年   15369篇
  1977年   13031篇
  1976年   12115篇
  1975年   13000篇
  1974年   15017篇
  1973年   14394篇
  1972年   13137篇
  1971年   11860篇
  1970年   11202篇
排序方式: 共有10000条查询结果,搜索用时 52 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.
9.
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   
10.
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   
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