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   1280498篇
  免费   100211篇
  国内免费   2004篇
耳鼻咽喉   18501篇
儿科学   44694篇
妇产科学   35118篇
基础医学   182610篇
口腔科学   33736篇
临床医学   111372篇
内科学   258698篇
皮肤病学   28128篇
神经病学   100637篇
特种医学   51451篇
外国民族医学   661篇
外科学   197131篇
综合类   27245篇
现状与发展   1篇
一般理论   384篇
预防医学   95780篇
眼科学   27975篇
药学   95260篇
  2篇
中国医学   2453篇
肿瘤学   70876篇
  2018年   13322篇
  2017年   10118篇
  2016年   11068篇
  2015年   12557篇
  2014年   17419篇
  2013年   26567篇
  2012年   36481篇
  2011年   38551篇
  2010年   23125篇
  2009年   22051篇
  2008年   37002篇
  2007年   39616篇
  2006年   39807篇
  2005年   38736篇
  2004年   37846篇
  2003年   36662篇
  2002年   35989篇
  2001年   64110篇
  2000年   66640篇
  1999年   56528篇
  1998年   15192篇
  1997年   13792篇
  1996年   14231篇
  1995年   13490篇
  1994年   12801篇
  1993年   11807篇
  1992年   44567篇
  1991年   43515篇
  1990年   42259篇
  1989年   40153篇
  1988年   36924篇
  1987年   36256篇
  1986年   33633篇
  1985年   32314篇
  1984年   24165篇
  1983年   20258篇
  1982年   11710篇
  1981年   10659篇
  1980年   9479篇
  1979年   21331篇
  1978年   14806篇
  1977年   12510篇
  1976年   11694篇
  1975年   12622篇
  1974年   14669篇
  1973年   14125篇
  1972年   12961篇
  1971年   11732篇
  1970年   11055篇
  1969年   10033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.
3.
Anaplastic thyroid carcinoma (ATC) is an aggressive thyroid malignancy with high mortality rate. This malignancy arises in thyroid follicular cells either denovo or with an associated differentiated thyroid carcinoma component. Clinically, it usually presents as a rapidly enlarging mass, pain and locally compressive symptoms. Histopathologic variability and heterogeneity often pose diagnostic challenges, especially in scant and paucicellular specimens. This article describes the clinical, histopathologic and molecular features of ATC and also addresses the associated diagnostic limitations and challenges.  相似文献   
4.
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