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   1393577篇
  免费   108144篇
  国内免费   2516篇
耳鼻咽喉   19918篇
儿科学   47439篇
妇产科学   37136篇
基础医学   197311篇
口腔科学   36101篇
临床医学   122530篇
内科学   281775篇
皮肤病学   29548篇
神经病学   110901篇
特种医学   55854篇
外国民族医学   660篇
外科学   215062篇
综合类   28735篇
现状与发展   2篇
一般理论   543篇
预防医学   106638篇
眼科学   30475篇
药学   103069篇
  4篇
中国医学   2585篇
肿瘤学   77951篇
  2019年   11120篇
  2018年   15640篇
  2017年   11825篇
  2016年   12833篇
  2015年   14697篇
  2014年   20642篇
  2013年   31543篇
  2012年   43666篇
  2011年   46229篇
  2010年   27387篇
  2009年   25999篇
  2008年   43929篇
  2007年   47110篇
  2006年   47035篇
  2005年   46122篇
  2004年   44963篇
  2003年   43358篇
  2002年   42556篇
  2001年   65067篇
  2000年   67379篇
  1999年   57598篇
  1998年   16564篇
  1997年   14894篇
  1996年   15277篇
  1995年   14512篇
  1994年   13637篇
  1993年   12657篇
  1992年   45268篇
  1991年   44169篇
  1990年   42824篇
  1989年   40725篇
  1988年   37510篇
  1987年   36854篇
  1986年   34250篇
  1985年   32981篇
  1984年   24929篇
  1983年   21032篇
  1982年   12736篇
  1981年   11730篇
  1980年   10389篇
  1979年   21903篇
  1978年   15414篇
  1977年   13053篇
  1976年   12141篇
  1975年   13039篇
  1974年   15079篇
  1973年   14504篇
  1972年   13205篇
  1971年   11988篇
  1970年   11270篇
排序方式: 共有10000条查询结果,搜索用时 62 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