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   1408183篇
  免费   105169篇
  国内免费   2269篇
耳鼻咽喉   20150篇
儿科学   48011篇
妇产科学   38039篇
基础医学   201499篇
口腔科学   38310篇
临床医学   118791篇
内科学   286557篇
皮肤病学   31585篇
神经病学   111249篇
特种医学   54375篇
外国民族医学   661篇
外科学   211026篇
综合类   27686篇
现状与发展   1篇
一般理论   397篇
预防医学   111795篇
眼科学   31551篇
药学   105251篇
  2篇
中国医学   2958篇
肿瘤学   75727篇
  2019年   11355篇
  2018年   17158篇
  2017年   12498篇
  2016年   13450篇
  2015年   15206篇
  2014年   20277篇
  2013年   30987篇
  2012年   44360篇
  2011年   46765篇
  2010年   27113篇
  2009年   24896篇
  2008年   43777篇
  2007年   46907篇
  2006年   46855篇
  2005年   45476篇
  2004年   43970篇
  2003年   42451篇
  2002年   41495篇
  2001年   67386篇
  2000年   70302篇
  1999年   59342篇
  1998年   15679篇
  1997年   14105篇
  1996年   14543篇
  1995年   13754篇
  1994年   13025篇
  1993年   12004篇
  1992年   46254篇
  1991年   44995篇
  1990年   43684篇
  1989年   41430篇
  1988年   38157篇
  1987年   37401篇
  1986年   34810篇
  1985年   33439篇
  1984年   24988篇
  1983年   20994篇
  1982年   12103篇
  1981年   11014篇
  1979年   22335篇
  1978年   15489篇
  1977年   13189篇
  1976年   12332篇
  1975年   13379篇
  1974年   15646篇
  1973年   15126篇
  1972年   13911篇
  1971年   12671篇
  1970年   11925篇
  1969年   10973篇
排序方式: 共有10000条查询结果,搜索用时 31 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