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   1295093篇
  免费   101438篇
  国内免费   2062篇
耳鼻咽喉   18801篇
儿科学   44963篇
妇产科学   35429篇
基础医学   184399篇
口腔科学   33891篇
临床医学   113296篇
内科学   261585篇
皮肤病学   28463篇
神经病学   102151篇
特种医学   51993篇
外国民族医学   660篇
外科学   199182篇
综合类   27336篇
现状与发展   2篇
一般理论   399篇
预防医学   97491篇
眼科学   28320篇
药学   96168篇
  2篇
中国医学   2445篇
肿瘤学   71617篇
  2018年   13644篇
  2017年   10332篇
  2016年   11323篇
  2015年   12866篇
  2014年   17879篇
  2013年   27197篇
  2012年   37410篇
  2011年   39539篇
  2010年   23633篇
  2009年   22587篇
  2008年   37914篇
  2007年   40639篇
  2006年   40827篇
  2005年   39778篇
  2004年   38942篇
  2003年   37638篇
  2002年   36883篇
  2001年   64316篇
  2000年   66782篇
  1999年   56690篇
  1998年   15409篇
  1997年   13960篇
  1996年   14375篇
  1995年   13618篇
  1994年   12866篇
  1993年   11862篇
  1992年   44700篇
  1991年   43618篇
  1990年   42359篇
  1989年   40255篇
  1988年   36998篇
  1987年   36357篇
  1986年   33720篇
  1985年   32398篇
  1984年   24248篇
  1983年   20311篇
  1982年   11779篇
  1981年   10763篇
  1980年   9549篇
  1979年   21394篇
  1978年   14882篇
  1977年   12581篇
  1976年   11734篇
  1975年   12666篇
  1974年   14713篇
  1973年   14190篇
  1972年   13019篇
  1971年   11754篇
  1970年   11089篇
  1969年   10055篇
排序方式: 共有10000条查询结果,搜索用时 328 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