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   1414272篇
  免费   105612篇
  国内免费   2279篇
耳鼻咽喉   20198篇
儿科学   48150篇
妇产科学   38169篇
基础医学   202593篇
口腔科学   38361篇
临床医学   119435篇
内科学   287829篇
皮肤病学   31707篇
神经病学   111814篇
特种医学   54642篇
外国民族医学   661篇
外科学   211653篇
综合类   27720篇
现状与发展   1篇
一般理论   404篇
预防医学   112291篇
眼科学   31657篇
药学   105694篇
  2篇
中国医学   2967篇
肿瘤学   76215篇
  2019年   11466篇
  2018年   17363篇
  2017年   12657篇
  2016年   13603篇
  2015年   15392篇
  2014年   20461篇
  2013年   31234篇
  2012年   44852篇
  2011年   47291篇
  2010年   27355篇
  2009年   25111篇
  2008年   44200篇
  2007年   47439篇
  2006年   47328篇
  2005年   45950篇
  2004年   44378篇
  2003年   42847篇
  2002年   41831篇
  2001年   67413篇
  2000年   70341篇
  1999年   59373篇
  1998年   15692篇
  1997年   14121篇
  1996年   14551篇
  1995年   13761篇
  1994年   13033篇
  1993年   12010篇
  1992年   46271篇
  1991年   45011篇
  1990年   43692篇
  1989年   41441篇
  1988年   38158篇
  1987年   37403篇
  1986年   34815篇
  1985年   33445篇
  1984年   24991篇
  1983年   20997篇
  1982年   12107篇
  1981年   11015篇
  1979年   22334篇
  1978年   15490篇
  1977年   13190篇
  1976年   12332篇
  1975年   13380篇
  1974年   15646篇
  1973年   15131篇
  1972年   13910篇
  1971年   12673篇
  1970年   11927篇
  1969年   10977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.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
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