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   1486895篇
  免费   105393篇
  国内免费   2635篇
耳鼻咽喉   21206篇
儿科学   52142篇
妇产科学   41262篇
基础医学   210050篇
口腔科学   39455篇
临床医学   128230篇
内科学   296828篇
皮肤病学   32806篇
神经病学   114967篇
特种医学   62129篇
外国民族医学   748篇
外科学   227312篇
综合类   28249篇
现状与发展   1篇
一般理论   397篇
预防医学   112881篇
眼科学   32369篇
药学   108845篇
  5篇
中国医学   2618篇
肿瘤学   82423篇
  2018年   18085篇
  2017年   14862篇
  2016年   15198篇
  2015年   18237篇
  2014年   22936篇
  2013年   31656篇
  2012年   48594篇
  2011年   45826篇
  2010年   26523篇
  2009年   26910篇
  2008年   41274篇
  2007年   44398篇
  2006年   44659篇
  2005年   51969篇
  2004年   53399篇
  2003年   47296篇
  2002年   40458篇
  2001年   67371篇
  2000年   67927篇
  1999年   60825篇
  1998年   15814篇
  1997年   14163篇
  1996年   14629篇
  1995年   13907篇
  1994年   13147篇
  1993年   12102篇
  1992年   49787篇
  1991年   48883篇
  1990年   47825篇
  1989年   45476篇
  1988年   41857篇
  1987年   41102篇
  1986年   38318篇
  1985年   36366篇
  1984年   26985篇
  1983年   22608篇
  1982年   12562篇
  1981年   11292篇
  1979年   24421篇
  1978年   16788篇
  1977年   14027篇
  1976年   12997篇
  1975年   14732篇
  1974年   17329篇
  1973年   16427篇
  1972年   15298篇
  1971年   14091篇
  1970年   13236篇
  1969年   12159篇
  1968年   11066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