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   1365173篇
  免费   104520篇
  国内免费   2821篇
耳鼻咽喉   19393篇
儿科学   46841篇
妇产科学   37322篇
基础医学   193584篇
口腔科学   35784篇
临床医学   118601篇
内科学   277720篇
皮肤病学   29822篇
神经病学   108545篇
特种医学   54638篇
外国民族医学   679篇
外科学   208620篇
综合类   28594篇
现状与发展   1篇
一般理论   418篇
预防医学   100664篇
眼科学   29345篇
药学   101707篇
  5篇
中国医学   2901篇
肿瘤学   77330篇
  2019年   10864篇
  2018年   15304篇
  2017年   11590篇
  2016年   12658篇
  2015年   14427篇
  2014年   19905篇
  2013年   29986篇
  2012年   41251篇
  2011年   43335篇
  2010年   26140篇
  2009年   24781篇
  2008年   41172篇
  2007年   43957篇
  2006年   43963篇
  2005年   42697篇
  2004年   42040篇
  2003年   40676篇
  2002年   39955篇
  2001年   66492篇
  2000年   68983篇
  1999年   58441篇
  1998年   16104篇
  1997年   14505篇
  1996年   14855篇
  1995年   14113篇
  1994年   13324篇
  1993年   12313篇
  1992年   45732篇
  1991年   44607篇
  1990年   43197篇
  1989年   41065篇
  1988年   37776篇
  1987年   37046篇
  1986年   34463篇
  1985年   32999篇
  1984年   24717篇
  1983年   20761篇
  1982年   12073篇
  1981年   10971篇
  1979年   21739篇
  1978年   15124篇
  1977年   12791篇
  1976年   11939篇
  1975年   12929篇
  1974年   15037篇
  1973年   14480篇
  1972年   13251篇
  1971年   12055篇
  1970年   11341篇
  1969年   10310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.
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   
7.
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   
8.
9.
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