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   1703148篇
  免费   127772篇
  国内免费   2556篇
耳鼻咽喉   24376篇
儿科学   58359篇
妇产科学   46337篇
基础医学   251711篇
口腔科学   46580篇
临床医学   148816篇
内科学   333574篇
皮肤病学   38001篇
神经病学   131133篇
特种医学   66267篇
外国民族医学   714篇
外科学   259970篇
综合类   34558篇
现状与发展   1篇
一般理论   509篇
预防医学   129506篇
眼科学   38428篇
药学   128394篇
  3篇
中国医学   3262篇
肿瘤学   92977篇
  2018年   17087篇
  2017年   12927篇
  2016年   14258篇
  2015年   16072篇
  2014年   22341篇
  2013年   34294篇
  2012年   46802篇
  2011年   50139篇
  2010年   29755篇
  2009年   28271篇
  2008年   48082篇
  2007年   51432篇
  2006年   51994篇
  2005年   50510篇
  2004年   49377篇
  2003年   47563篇
  2002年   46912篇
  2001年   82527篇
  2000年   85842篇
  1999年   72358篇
  1998年   19597篇
  1997年   17587篇
  1996年   18267篇
  1995年   17126篇
  1994年   16206篇
  1993年   15102篇
  1992年   56968篇
  1991年   56389篇
  1990年   55331篇
  1989年   52949篇
  1988年   48857篇
  1987年   48113篇
  1986年   44897篇
  1985年   43052篇
  1984年   32103篇
  1983年   27074篇
  1982年   15549篇
  1981年   14237篇
  1979年   29322篇
  1978年   20627篇
  1977年   17455篇
  1976年   16454篇
  1975年   18078篇
  1974年   21301篇
  1973年   20338篇
  1972年   19005篇
  1971年   17614篇
  1970年   16500篇
  1969年   15268篇
  1968年   14087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.
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