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   1390226篇
  免费   108058篇
  国内免费   2511篇
耳鼻咽喉   19912篇
儿科学   47349篇
妇产科学   37118篇
基础医学   196780篇
口腔科学   36072篇
临床医学   122120篇
内科学   280633篇
皮肤病学   29535篇
神经病学   110682篇
特种医学   55812篇
外国民族医学   660篇
外科学   214829篇
综合类   28713篇
现状与发展   2篇
一般理论   543篇
预防医学   106280篇
眼科学   30367篇
药学   102983篇
  4篇
中国医学   2584篇
肿瘤学   77817篇
  2019年   11116篇
  2018年   15635篇
  2017年   11817篇
  2016年   12825篇
  2015年   14691篇
  2014年   20634篇
  2013年   31518篇
  2012年   43623篇
  2011年   46191篇
  2010年   27361篇
  2009年   25981篇
  2008年   43886篇
  2007年   47076篇
  2006年   46992篇
  2005年   46073篇
  2004年   44925篇
  2003年   43324篇
  2002年   42518篇
  2001年   65039篇
  2000年   67352篇
  1999年   57573篇
  1998年   16552篇
  1997年   14886篇
  1996年   15268篇
  1995年   14497篇
  1994年   13557篇
  1993年   12551篇
  1992年   45179篇
  1991年   44137篇
  1990年   42782篇
  1989年   40688篇
  1988年   37447篇
  1987年   36826篇
  1986年   34203篇
  1985年   32954篇
  1984年   24883篇
  1983年   20956篇
  1982年   12669篇
  1981年   11655篇
  1980年   10307篇
  1979年   21825篇
  1978年   15356篇
  1977年   12986篇
  1976年   12094篇
  1975年   12993篇
  1974年   15039篇
  1973年   14478篇
  1972年   13195篇
  1971年   11977篇
  1970年   11266篇
排序方式: 共有10000条查询结果,搜索用时 156 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.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome.  相似文献   
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