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   1286590篇
  免费   100815篇
  国内免费   2365篇
耳鼻咽喉   18537篇
儿科学   44532篇
妇产科学   35179篇
基础医学   183605篇
口腔科学   33708篇
临床医学   112432篇
内科学   259723篇
皮肤病学   28461篇
神经病学   100875篇
特种医学   51675篇
外国民族医学   667篇
外科学   197247篇
综合类   27882篇
现状与发展   2篇
一般理论   381篇
预防医学   96339篇
眼科学   28189篇
药学   96069篇
  7篇
中国医学   2897篇
肿瘤学   71363篇
  2018年   13503篇
  2017年   10287篇
  2016年   11318篇
  2015年   12949篇
  2014年   17845篇
  2013年   26842篇
  2012年   37002篇
  2011年   38977篇
  2010年   23328篇
  2009年   22265篇
  2008年   37220篇
  2007年   39780篇
  2006年   39908篇
  2005年   38856篇
  2004年   37892篇
  2003年   36727篇
  2002年   36023篇
  2001年   64095篇
  2000年   66616篇
  1999年   56543篇
  1998年   15211篇
  1997年   13839篇
  1996年   14249篇
  1995年   13515篇
  1994年   12804篇
  1993年   11821篇
  1992年   44602篇
  1991年   43498篇
  1990年   42244篇
  1989年   40137篇
  1988年   36912篇
  1987年   36255篇
  1986年   33630篇
  1985年   32292篇
  1984年   24141篇
  1983年   20278篇
  1982年   11728篇
  1981年   10695篇
  1980年   9517篇
  1979年   21347篇
  1978年   14822篇
  1977年   12534篇
  1976年   11694篇
  1975年   12626篇
  1974年   14664篇
  1973年   14120篇
  1972年   12945篇
  1971年   11732篇
  1970年   11055篇
  1969年   10025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.
The present letter to the editor is in response to the research “Outcomes of curative liver resection for hepatocellular carcinoma in patients with cirrhosis” by Elshaarawy et al in World J Gastroenterol 2021; 13(5): 424–439. The preoperative assessment of the liver reserve function in hepatocellular carcinoma (HCC) patients with cirrhosis is crucial, and there is no universal consensus on how to assess it. Based on a retrospective study, Elshaarawy et al investigated the impact of various classical clinical indicators on liver failure and the prognosis after hepatectomy in HCC patients with cirrhosis. We recommend that we should strive to explore new appraisal indicators, such as the indocyanine green retention rate at 15 min.  相似文献   
3.
4.
5.
6.
7.
8.
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   
9.
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   
10.
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