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   1276570篇
  免费   99897篇
  国内免费   1988篇
耳鼻咽喉   18425篇
儿科学   44373篇
妇产科学   35005篇
基础医学   182208篇
口腔科学   33664篇
临床医学   111202篇
内科学   258035篇
皮肤病学   28030篇
神经病学   100343篇
特种医学   51221篇
外国民族医学   660篇
外科学   196543篇
综合类   27045篇
现状与发展   1篇
一般理论   377篇
预防医学   95635篇
眼科学   27881篇
药学   94762篇
  2篇
中国医学   2422篇
肿瘤学   70621篇
  2018年   13137篇
  2017年   9970篇
  2016年   10914篇
  2015年   12381篇
  2014年   17179篇
  2013年   26242篇
  2012年   36051篇
  2011年   38086篇
  2010年   22822篇
  2009年   21830篇
  2008年   36666篇
  2007年   39274篇
  2006年   39534篇
  2005年   38460篇
  2004年   37612篇
  2003年   36469篇
  2002年   35825篇
  2001年   64006篇
  2000年   66515篇
  1999年   56439篇
  1998年   15134篇
  1997年   13759篇
  1996年   14203篇
  1995年   13462篇
  1994年   12776篇
  1993年   11798篇
  1992年   44567篇
  1991年   43476篇
  1990年   42238篇
  1989年   40127篇
  1988年   36907篇
  1987年   36248篇
  1986年   33631篇
  1985年   32292篇
  1984年   24142篇
  1983年   20273篇
  1982年   11727篇
  1981年   10698篇
  1980年   9518篇
  1979年   21347篇
  1978年   14823篇
  1977年   12537篇
  1976年   11695篇
  1975年   12624篇
  1974年   14664篇
  1973年   14118篇
  1972年   12948篇
  1971年   11730篇
  1970年   11052篇
  1969年   10025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.
Collagens are the most abundant proteins in the extracellular matrix. They provide a framework to build organs and tissues and give structural support to make them resistant to mechanical load and forces. Several intra‐ and extracellular modifications are needed to make functional collagen molecules, intracellular post‐translational modifications of proline and lysine residues having key roles in this. In this article, we provide a review on the enzymes responsible for the proline and lysine modifications, that is collagen prolyl 4‐hydroxylases, 3‐hydroxylases and lysyl hydroxylases, and discuss their biological functions and involvement in diseases.  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