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   1412600篇
  免费   105357篇
  国内免费   2287篇
耳鼻咽喉   20178篇
儿科学   48100篇
妇产科学   38269篇
基础医学   202103篇
口腔科学   38382篇
临床医学   119163篇
内科学   287598篇
皮肤病学   31756篇
神经病学   111598篇
特种医学   54455篇
外国民族医学   661篇
外科学   211466篇
综合类   27723篇
现状与发展   1篇
一般理论   399篇
预防医学   112245篇
眼科学   31639篇
药学   105597篇
  2篇
中国医学   2986篇
肿瘤学   75923篇
  2019年   11655篇
  2018年   17197篇
  2017年   12536篇
  2016年   13502篇
  2015年   15251篇
  2014年   20558篇
  2013年   31281篇
  2012年   44542篇
  2011年   47010篇
  2010年   27353篇
  2009年   25193篇
  2008年   43960篇
  2007年   47051篇
  2006年   46981篇
  2005年   45615篇
  2004年   44086篇
  2003年   42550篇
  2002年   41592篇
  2001年   67489篇
  2000年   70381篇
  1999年   59430篇
  1998年   15775篇
  1997年   14190篇
  1996年   14596篇
  1995年   13799篇
  1994年   13071篇
  1993年   12039篇
  1992年   46307篇
  1991年   45035篇
  1990年   43720篇
  1989年   41465篇
  1988年   38169篇
  1987年   37421篇
  1986年   34839篇
  1985年   33448篇
  1984年   24999篇
  1983年   21006篇
  1982年   12114篇
  1981年   11020篇
  1979年   22343篇
  1978年   15491篇
  1977年   13192篇
  1976年   12336篇
  1975年   13383篇
  1974年   15653篇
  1973年   15137篇
  1972年   13924篇
  1971年   12680篇
  1970年   11930篇
  1969年   10977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.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
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