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   1318626篇
  免费   102587篇
  国内免费   2113篇
耳鼻咽喉   18939篇
儿科学   45556篇
妇产科学   35765篇
基础医学   187298篇
口腔科学   34321篇
临床医学   115599篇
内科学   267093篇
皮肤病学   28679篇
神经病学   104297篇
特种医学   52889篇
外国民族医学   661篇
外科学   203730篇
综合类   27451篇
现状与发展   1篇
一般理论   414篇
预防医学   98377篇
眼科学   28629篇
药学   97290篇
  2篇
中国医学   2466篇
肿瘤学   73869篇
  2019年   9997篇
  2018年   14216篇
  2017年   10764篇
  2016年   11722篇
  2015年   13377篇
  2014年   18738篇
  2013年   28187篇
  2012年   39239篇
  2011年   41405篇
  2010年   24677篇
  2009年   23439篇
  2008年   39609篇
  2007年   42322篇
  2006年   42570篇
  2005年   41425篇
  2004年   40484篇
  2003年   39172篇
  2002年   38281篇
  2001年   64318篇
  2000年   66721篇
  1999年   56742篇
  1998年   15644篇
  1997年   14162篇
  1996年   14509篇
  1995年   13746篇
  1994年   13048篇
  1993年   12028篇
  1992年   44730篇
  1991年   43631篇
  1990年   42359篇
  1989年   40249篇
  1988年   37027篇
  1987年   36352篇
  1986年   33731篇
  1985年   32395篇
  1984年   24276篇
  1983年   20422篇
  1982年   11896篇
  1981年   10833篇
  1979年   21416篇
  1978年   14884篇
  1977年   12589篇
  1976年   11729篇
  1975年   12647篇
  1974年   14697篇
  1973年   14135篇
  1972年   12960篇
  1971年   11741篇
  1970年   11057篇
  1969年   10031篇
排序方式: 共有10000条查询结果,搜索用时 46 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