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   1517049篇
  免费   117444篇
  国内免费   2998篇
耳鼻咽喉   21246篇
儿科学   50719篇
妇产科学   39760篇
基础医学   213813篇
口腔科学   38271篇
临床医学   135927篇
内科学   307656篇
皮肤病学   31157篇
神经病学   123459篇
特种医学   59243篇
外国民族医学   668篇
外科学   232608篇
综合类   30577篇
现状与发展   1篇
一般理论   687篇
预防医学   117436篇
眼科学   33993篇
药学   111109篇
  6篇
中国医学   2794篇
肿瘤学   86361篇
  2021年   12997篇
  2019年   14007篇
  2018年   18630篇
  2017年   14113篇
  2016年   15483篇
  2015年   17747篇
  2014年   25082篇
  2013年   37280篇
  2012年   52747篇
  2011年   55559篇
  2010年   32667篇
  2009年   30611篇
  2008年   52091篇
  2007年   55508篇
  2006年   55520篇
  2005年   54527篇
  2004年   52736篇
  2003年   50542篇
  2002年   49027篇
  2001年   66439篇
  2000年   68499篇
  1999年   58937篇
  1998年   18166篇
  1997年   16322篇
  1996年   16392篇
  1995年   15558篇
  1994年   14503篇
  1993年   13347篇
  1992年   46095篇
  1991年   44855篇
  1990年   43453篇
  1989年   41316篇
  1988年   38105篇
  1987年   37408篇
  1986年   34799篇
  1985年   33479篇
  1984年   25514篇
  1983年   21492篇
  1982年   13122篇
  1981年   12048篇
  1979年   22254篇
  1978年   15706篇
  1977年   13293篇
  1976年   12363篇
  1975年   13202篇
  1974年   15275篇
  1973年   14626篇
  1972年   13417篇
  1971年   12095篇
  1970年   11404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.
9.
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   
10.
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   
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