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   1347211篇
  免费   103805篇
  国内免费   2186篇
耳鼻咽喉   19317篇
儿科学   45917篇
妇产科学   36472篇
基础医学   191781篇
口腔科学   36384篇
临床医学   116791篇
内科学   275097篇
皮肤病学   29548篇
神经病学   106645篇
特种医学   52870篇
外国民族医学   660篇
外科学   205709篇
综合类   27535篇
现状与发展   1篇
一般理论   408篇
预防医学   101893篇
眼科学   29252篇
药学   99665篇
  2篇
中国医学   2753篇
肿瘤学   74502篇
  2019年   10290篇
  2018年   15298篇
  2017年   11369篇
  2016年   12401篇
  2015年   14392篇
  2014年   19304篇
  2013年   29256篇
  2012年   42241篇
  2011年   44506篇
  2010年   25761篇
  2009年   24018篇
  2008年   41968篇
  2007年   44799篇
  2006年   44958篇
  2005年   43729篇
  2004年   42360篇
  2003年   40868篇
  2002年   39918篇
  2001年   65083篇
  2000年   67886篇
  1999年   57175篇
  1998年   15386篇
  1997年   13955篇
  1996年   14382篇
  1995年   13624篇
  1994年   12902篇
  1993年   11935篇
  1992年   44739篇
  1991年   43620篇
  1990年   42319篇
  1989年   40225篇
  1988年   36972篇
  1987年   36298篇
  1986年   33699篇
  1985年   32367篇
  1984年   24254篇
  1983年   20346篇
  1982年   11824篇
  1981年   10773篇
  1979年   21397篇
  1978年   14872篇
  1977年   12572篇
  1976年   11730篇
  1975年   12653篇
  1974年   14704篇
  1973年   14155篇
  1972年   12954篇
  1971年   11747篇
  1970年   11068篇
  1969年   10043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 exercise pressor reflex is a feedback mechanism engaged upon stimulation of mechano- and metabosensitive skeletal muscle afferents. Activation of these afferents elicits a reflex increase in heart rate, blood pressure, and ventilation in an intensity-dependent manner. Consequently, the exercise pressor reflex has been postulated to be one of the principal mediators of the cardiorespiratory responses to exercise. In this updated review, we will discuss classical and recent advancements in our understating of the exercise pressor reflex function in both human and animal models. Particular attention will be paid to the afferent mechanisms and pathways involved during its activation, its effects on different target organs, its potential role in the abnormal cardiovascular response to exercise in diseased states, and the impact of age and biological sex on these responses. Finally, we will highlight some unanswered questions in the literature that may inspire future investigations in the field.

  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