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   1393580篇
  免费   105873篇
  国内免费   2082篇
耳鼻咽喉   20432篇
儿科学   48483篇
妇产科学   37796篇
基础医学   199818篇
口腔科学   37576篇
临床医学   121085篇
内科学   279063篇
皮肤病学   31468篇
神经病学   112454篇
特种医学   56156篇
外国民族医学   660篇
外科学   213978篇
综合类   27591篇
现状与发展   1篇
一般理论   412篇
预防医学   102188篇
眼科学   30584篇
药学   102819篇
  2篇
中国医学   2601篇
肿瘤学   76368篇
  2019年   10316篇
  2018年   15696篇
  2017年   12171篇
  2016年   13733篇
  2015年   14830篇
  2014年   19802篇
  2013年   31005篇
  2012年   42146篇
  2011年   45063篇
  2010年   26749篇
  2009年   24426篇
  2008年   43714篇
  2007年   46675篇
  2006年   46673篇
  2005年   45498篇
  2004年   44258篇
  2003年   43112篇
  2002年   42339篇
  2001年   67834篇
  2000年   71421篇
  1999年   59213篇
  1998年   16327篇
  1997年   14711篇
  1996年   14974篇
  1995年   14077篇
  1994年   13399篇
  1993年   12384篇
  1992年   45118篇
  1991年   43955篇
  1990年   42675篇
  1989年   40603篇
  1988年   37310篇
  1987年   36717篇
  1986年   34011篇
  1985年   32848篇
  1984年   24693篇
  1983年   20747篇
  1982年   12231篇
  1981年   11162篇
  1979年   21725篇
  1978年   15220篇
  1977年   12940篇
  1976年   12035篇
  1975年   12972篇
  1974年   14994篇
  1973年   14399篇
  1972年   13161篇
  1971年   11969篇
  1970年   11271篇
  1969年   10213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