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   1277712篇
  免费   99986篇
  国内免费   1988篇
耳鼻咽喉   18454篇
儿科学   44394篇
妇产科学   35080篇
基础医学   182379篇
口腔科学   33636篇
临床医学   111324篇
内科学   258288篇
皮肤病学   28061篇
神经病学   100442篇
特种医学   51295篇
外国民族医学   660篇
外科学   196602篇
综合类   27075篇
现状与发展   1篇
一般理论   378篇
预防医学   95724篇
眼科学   27891篇
药学   94856篇
  2篇
中国医学   2422篇
肿瘤学   70722篇
  2018年   13158篇
  2017年   9997篇
  2016年   10934篇
  2015年   12407篇
  2014年   17210篇
  2013年   26315篇
  2012年   36122篇
  2011年   38159篇
  2010年   22861篇
  2009年   21877篇
  2008年   36742篇
  2007年   39379篇
  2006年   39604篇
  2005年   38564篇
  2004年   37695篇
  2003年   36538篇
  2002年   35898篇
  2001年   64063篇
  2000年   66546篇
  1999年   56472篇
  1998年   15145篇
  1997年   13767篇
  1996年   14213篇
  1995年   13470篇
  1994年   12792篇
  1993年   11815篇
  1992年   44604篇
  1991年   43512篇
  1990年   42248篇
  1989年   40153篇
  1988年   36932篇
  1987年   36267篇
  1986年   33646篇
  1985年   32305篇
  1984年   24158篇
  1983年   20282篇
  1982年   11729篇
  1981年   10703篇
  1980年   9526篇
  1979年   21356篇
  1978年   14837篇
  1977年   12551篇
  1976年   11709篇
  1975年   12637篇
  1974年   14675篇
  1973年   14120篇
  1972年   12954篇
  1971年   11732篇
  1970年   11050篇
  1969年   10031篇
排序方式: 共有10000条查询结果,搜索用时 31 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.
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   
8.
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   
9.
10.
Gold nanoparticles (Au NPs) hold great promise in food, industrial and biomedical applications due to their unique physicochemical properties. However, influences of the gastrointestinal tract (GIT), a likely route for Au NPs administration, on the physicochemical properties of Au NPs has been rarely evaluated. Here, we investigated the influence of GIT fluids on the physicochemical properties of Au NPs (5, 50, and 100?nm) and their implications on intestinal epithelial permeability in vitro. Au NPs aggregated in fasted gastric fluids and generated hydroxyl radicals in the presence of H2O2. Cell studies showed that GIT fluids incubation of Au NPs affected the cellular uptake of Au NPs but did not induce cytotoxicity or disturb the intestinal epithelial permeability.  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