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   1414949篇
  免费   107739篇
  国内免费   2407篇
耳鼻咽喉   20249篇
儿科学   48717篇
妇产科学   37951篇
基础医学   201029篇
口腔科学   40334篇
临床医学   121615篇
内科学   287899篇
皮肤病学   31445篇
神经病学   112043篇
特种医学   55389篇
外国民族医学   682篇
外科学   213255篇
综合类   28223篇
现状与发展   2篇
一般理论   426篇
预防医学   110637篇
眼科学   30640篇
药学   103273篇
  2篇
中国医学   3021篇
肿瘤学   78263篇
  2021年   11202篇
  2019年   12061篇
  2018年   17277篇
  2017年   13027篇
  2016年   13788篇
  2015年   15775篇
  2014年   21841篇
  2013年   32097篇
  2012年   45145篇
  2011年   47705篇
  2010年   27753篇
  2009年   26148篇
  2008年   43906篇
  2007年   47121篇
  2006年   46645篇
  2005年   45970篇
  2004年   44713篇
  2003年   42874篇
  2002年   40443篇
  2001年   67345篇
  2000年   69714篇
  1999年   59312篇
  1998年   16344篇
  1997年   14747篇
  1996年   15150篇
  1995年   14265篇
  1994年   13568篇
  1993年   12541篇
  1992年   46275篇
  1991年   45182篇
  1990年   43777篇
  1989年   41656篇
  1988年   38348篇
  1987年   37561篇
  1986年   34935篇
  1985年   33543篇
  1984年   25040篇
  1983年   21003篇
  1982年   12167篇
  1981年   11100篇
  1979年   22053篇
  1978年   15278篇
  1977年   12892篇
  1976年   12002篇
  1975年   13049篇
  1974年   15107篇
  1973年   14554篇
  1972年   13322篇
  1971年   12077篇
  1970年   11438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.
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