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   2047524篇
  免费   152957篇
  国内免费   3135篇
耳鼻咽喉   29591篇
儿科学   64144篇
妇产科学   54348篇
基础医学   290866篇
口腔科学   58115篇
临床医学   178392篇
内科学   406099篇
皮肤病学   43861篇
神经病学   160071篇
特种医学   81417篇
外国民族医学   725篇
外科学   323186篇
综合类   42174篇
现状与发展   2篇
一般理论   579篇
预防医学   147225篇
眼科学   46125篇
药学   155442篇
  5篇
中国医学   4207篇
肿瘤学   117042篇
  2018年   20208篇
  2017年   15529篇
  2016年   17150篇
  2015年   19395篇
  2014年   26817篇
  2013年   40433篇
  2012年   55310篇
  2011年   58250篇
  2010年   34842篇
  2009年   33293篇
  2008年   56404篇
  2007年   60028篇
  2006年   60884篇
  2005年   59078篇
  2004年   57570篇
  2003年   55663篇
  2002年   54634篇
  2001年   107648篇
  2000年   111734篇
  1999年   94349篇
  1998年   23943篇
  1997年   21404篇
  1996年   21847篇
  1995年   20554篇
  1994年   19266篇
  1993年   17816篇
  1992年   73426篇
  1991年   71231篇
  1990年   69142篇
  1989年   66608篇
  1988年   61098篇
  1987年   59833篇
  1986年   55795篇
  1985年   53557篇
  1984年   39231篇
  1983年   33094篇
  1982年   18285篇
  1981年   16358篇
  1979年   34969篇
  1978年   23868篇
  1977年   20453篇
  1976年   18432篇
  1975年   20142篇
  1974年   23839篇
  1973年   22772篇
  1972年   21246篇
  1971年   19715篇
  1970年   18673篇
  1969年   17199篇
  1968年   15597篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
2.
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   
3.
4.
5.
6.
7.
8.
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