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   1312756篇
  免费   101472篇
  国内免费   2090篇
耳鼻咽喉   18752篇
儿科学   45293篇
妇产科学   35879篇
基础医学   186694篇
口腔科学   34220篇
临床医学   114789篇
内科学   264960篇
皮肤病学   28530篇
神经病学   104023篇
特种医学   52363篇
外国民族医学   660篇
外科学   202150篇
综合类   27476篇
现状与发展   2篇
一般理论   408篇
预防医学   98737篇
眼科学   28724篇
药学   97104篇
  2篇
中国医学   2528篇
肿瘤学   73024篇
  2019年   9822篇
  2018年   14055篇
  2017年   10604篇
  2016年   11557篇
  2015年   13147篇
  2014年   18348篇
  2013年   27760篇
  2012年   38520篇
  2011年   40669篇
  2010年   24256篇
  2009年   23132篇
  2008年   38997篇
  2007年   41769篇
  2006年   41838篇
  2005年   40781篇
  2004年   39775篇
  2003年   38503篇
  2002年   37653篇
  2001年   64323篇
  2000年   66796篇
  1999年   56737篇
  1998年   15506篇
  1997年   14089篇
  1996年   14525篇
  1995年   13725篇
  1994年   13030篇
  1993年   12027篇
  1992年   44779篇
  1991年   43656篇
  1990年   42386篇
  1989年   40264篇
  1988年   37059篇
  1987年   36382篇
  1986年   33754篇
  1985年   32411篇
  1984年   24267篇
  1983年   20410篇
  1982年   11903篇
  1981年   10858篇
  1979年   21427篇
  1978年   14931篇
  1977年   12636篇
  1976年   11779篇
  1975年   12711篇
  1974年   14733篇
  1973年   14171篇
  1972年   12995篇
  1971年   11773篇
  1970年   11096篇
  1969年   10056篇
排序方式: 共有10000条查询结果,搜索用时 10 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