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   1303266篇
  免费   101748篇
  国内免费   2092篇
耳鼻咽喉   18636篇
儿科学   45265篇
妇产科学   35570篇
基础医学   185879篇
口腔科学   34394篇
临床医学   113955篇
内科学   263139篇
皮肤病学   28354篇
神经病学   103275篇
特种医学   52183篇
外国民族医学   666篇
外科学   200044篇
综合类   27388篇
现状与发展   1篇
一般理论   426篇
预防医学   97655篇
眼科学   28857篇
药学   96745篇
  2篇
中国医学   2464篇
肿瘤学   72208篇
  2018年   13574篇
  2017年   10334篇
  2016年   11305篇
  2015年   12827篇
  2014年   17796篇
  2013年   27297篇
  2012年   37644篇
  2011年   39836篇
  2010年   23764篇
  2009年   22743篇
  2008年   38325篇
  2007年   41216篇
  2006年   41414篇
  2005年   40386篇
  2004年   39457篇
  2003年   38312篇
  2002年   37553篇
  2001年   64215篇
  2000年   66682篇
  1999年   56651篇
  1998年   15536篇
  1997年   14118篇
  1996年   14469篇
  1995年   13747篇
  1994年   13040篇
  1993年   12071篇
  1992年   44749篇
  1991年   43642篇
  1990年   42374篇
  1989年   40246篇
  1988年   37033篇
  1987年   36357篇
  1986年   33770篇
  1985年   32434篇
  1984年   24403篇
  1983年   20504篇
  1982年   12027篇
  1981年   10960篇
  1980年   9809篇
  1979年   21490篇
  1978年   14989篇
  1977年   12711篇
  1976年   11800篇
  1975年   12741篇
  1974年   14761篇
  1973年   14188篇
  1972年   13007篇
  1971年   11782篇
  1970年   11081篇
  1969年   10055篇
排序方式: 共有10000条查询结果,搜索用时 187 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