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   1306137篇
  免费   102218篇
  国内免费   2121篇
耳鼻咽喉   18672篇
儿科学   45286篇
妇产科学   35658篇
基础医学   185883篇
口腔科学   34170篇
临床医学   114089篇
内科学   264262篇
皮肤病学   28508篇
神经病学   103734篇
特种医学   52166篇
外国民族医学   661篇
外科学   200610篇
综合类   27513篇
现状与发展   1篇
一般理论   405篇
预防医学   98118篇
眼科学   28475篇
药学   97060篇
  3篇
中国医学   2474篇
肿瘤学   72728篇
  2019年   9699篇
  2018年   13832篇
  2017年   10518篇
  2016年   11496篇
  2015年   13102篇
  2014年   18197篇
  2013年   27649篇
  2012年   38137篇
  2011年   40412篇
  2010年   24147篇
  2009年   23046篇
  2008年   38667篇
  2007年   41554篇
  2006年   41661篇
  2005年   40682篇
  2004年   39632篇
  2003年   38391篇
  2002年   37606篇
  2001年   64261篇
  2000年   66714篇
  1999年   56736篇
  1998年   15539篇
  1997年   14048篇
  1996年   14493篇
  1995年   13707篇
  1994年   12980篇
  1993年   11953篇
  1992年   44690篇
  1991年   43641篇
  1990年   42356篇
  1989年   40221篇
  1988年   36994篇
  1987年   36332篇
  1986年   33690篇
  1985年   32408篇
  1984年   24328篇
  1983年   20387篇
  1982年   11904篇
  1981年   10861篇
  1979年   21403篇
  1978年   14902篇
  1977年   12601篇
  1976年   11765篇
  1975年   12660篇
  1974年   14725篇
  1973年   14172篇
  1972年   13000篇
  1971年   11768篇
  1970年   11075篇
  1969年   10044篇
排序方式: 共有10000条查询结果,搜索用时 156 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.
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   
8.
Cancer Causes & Control - Congenital malformations are strong risk factors for childhood cancer. Our objective was to determine whether cancer survival differs by birth defect status among...  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