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   1438698篇
  免费   102930篇
  国内免费   2400篇
耳鼻咽喉   20768篇
儿科学   50665篇
妇产科学   39987篇
基础医学   203315篇
口腔科学   38548篇
临床医学   123702篇
内科学   286533篇
皮肤病学   31957篇
神经病学   110055篇
特种医学   60301篇
外国民族医学   748篇
外科学   220495篇
综合类   28020篇
现状与发展   1篇
一般理论   378篇
预防医学   109494篇
眼科学   31567篇
药学   106069篇
  4篇
中国医学   2540篇
肿瘤学   78881篇
  2018年   16338篇
  2017年   13501篇
  2016年   13818篇
  2015年   16740篇
  2014年   20988篇
  2013年   29190篇
  2012年   44761篇
  2011年   42123篇
  2010年   24667篇
  2009年   25212篇
  2008年   38344篇
  2007年   41550篇
  2006年   42058篇
  2005年   48660篇
  2004年   49236篇
  2003年   43887篇
  2002年   38736篇
  2001年   67154篇
  2000年   67787篇
  1999年   60610篇
  1998年   15536篇
  1997年   13965篇
  1996年   14441篇
  1995年   13744篇
  1994年   13007篇
  1993年   11986篇
  1992年   49695篇
  1991年   48815篇
  1990年   47779篇
  1989年   45437篇
  1988年   41817篇
  1987年   41070篇
  1986年   38290篇
  1985年   36331篇
  1984年   26944篇
  1983年   22585篇
  1982年   12523篇
  1981年   11267篇
  1979年   24412篇
  1978年   16776篇
  1977年   14013篇
  1976年   12991篇
  1975年   14732篇
  1974年   17324篇
  1973年   16426篇
  1972年   15289篇
  1971年   14090篇
  1970年   13233篇
  1969年   12154篇
  1968年   11063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.
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