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   1380688篇
  免费   104520篇
  国内免费   2232篇
耳鼻咽喉   20023篇
儿科学   47367篇
妇产科学   37260篇
基础医学   196397篇
口腔科学   37410篇
临床医学   117756篇
内科学   283533篇
皮肤病学   31332篇
神经病学   108745篇
特种医学   53518篇
外国民族医学   662篇
外科学   208952篇
综合类   27628篇
现状与发展   1篇
一般理论   406篇
预防医学   106102篇
眼科学   30260篇
药学   102084篇
  2篇
中国医学   2960篇
肿瘤学   75042篇
  2019年   11525篇
  2018年   17214篇
  2017年   12375篇
  2016年   13165篇
  2015年   14906篇
  2014年   20032篇
  2013年   30542篇
  2012年   43775篇
  2011年   46236篇
  2010年   26848篇
  2009年   24647篇
  2008年   43139篇
  2007年   46180篇
  2006年   45954篇
  2005年   44825篇
  2004年   43180篇
  2003年   41733篇
  2002年   40717篇
  2001年   66687篇
  2000年   69675篇
  1999年   58761篇
  1998年   15533篇
  1997年   14002篇
  1996年   14439篇
  1995年   13639篇
  1994年   12908篇
  1993年   11930篇
  1992年   45494篇
  1991年   44285篇
  1990年   42933篇
  1989年   40714篇
  1988年   37381篇
  1987年   36722篇
  1986年   34101篇
  1985年   32710篇
  1984年   24439篇
  1983年   20504篇
  1982年   11841篇
  1981年   10794篇
  1979年   21608篇
  1978年   14995篇
  1977年   12694篇
  1976年   11879篇
  1975年   12858篇
  1974年   14936篇
  1973年   14412篇
  1972年   13204篇
  1971年   12011篇
  1970年   11306篇
  1969年   10279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