全文获取类型
收费全文 | 1310184篇 |
免费 | 103655篇 |
国内免费 | 4268篇 |
专业分类
耳鼻咽喉 | 18798篇 |
儿科学 | 44727篇 |
妇产科学 | 35291篇 |
基础医学 | 186264篇 |
口腔科学 | 34016篇 |
临床医学 | 115058篇 |
内科学 | 263591篇 |
皮肤病学 | 28774篇 |
神经病学 | 102352篇 |
特种医学 | 52838篇 |
外国民族医学 | 667篇 |
外科学 | 199780篇 |
综合类 | 32175篇 |
现状与发展 | 5篇 |
一般理论 | 380篇 |
预防医学 | 97850篇 |
眼科学 | 28809篇 |
药学 | 98541篇 |
20篇 | |
中国医学 | 4815篇 |
肿瘤学 | 73356篇 |
出版年
2019年 | 10356篇 |
2018年 | 14432篇 |
2017年 | 11172篇 |
2016年 | 12233篇 |
2015年 | 14206篇 |
2014年 | 19287篇 |
2013年 | 28270篇 |
2012年 | 38851篇 |
2011年 | 40951篇 |
2010年 | 24730篇 |
2009年 | 23312篇 |
2008年 | 38374篇 |
2007年 | 40956篇 |
2006年 | 41080篇 |
2005年 | 39969篇 |
2004年 | 38720篇 |
2003年 | 37678篇 |
2002年 | 36862篇 |
2001年 | 64827篇 |
2000年 | 67150篇 |
1999年 | 56942篇 |
1998年 | 15467篇 |
1997年 | 14079篇 |
1996年 | 14436篇 |
1995年 | 13654篇 |
1994年 | 12949篇 |
1993年 | 11919篇 |
1992年 | 44680篇 |
1991年 | 43593篇 |
1990年 | 42334篇 |
1989年 | 40201篇 |
1988年 | 36968篇 |
1987年 | 36292篇 |
1986年 | 33678篇 |
1985年 | 32317篇 |
1984年 | 24158篇 |
1983年 | 20274篇 |
1982年 | 11735篇 |
1981年 | 10710篇 |
1979年 | 21357篇 |
1978年 | 14826篇 |
1977年 | 12536篇 |
1976年 | 11697篇 |
1975年 | 12627篇 |
1974年 | 14666篇 |
1973年 | 14122篇 |
1972年 | 12950篇 |
1971年 | 11731篇 |
1970年 | 11051篇 |
1969年 | 10028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.
目的分析细棒、PEEK棒固定对寰枢关节稳定性的影响。方法采用6具新鲜成人枕骨(occipital bone,Oc)~颈椎C4节段进行测试,模拟以下手术及固定状态:①完整状态;②损伤状态:枢椎齿状突II型骨折;③坚强固定:寰枢椎均采用普通椎弓根螺钉固定,直径3.5 mm钛棒连接;④PEEK棒:直径3.5 mm的PEEK棒连接;⑤细棒:直径2.0 mm钛棒连接。采用重复测量实验设计,在完整、损伤和不同的固定状态下,通过脊柱试验机对标本分别施加1.5 N·m的前屈/后伸、左/右侧弯和左/右轴向旋转的纯力偶矩。采用Optotrak三维运动测量系统连续采集标本运动,分析寰枢椎之间角度运动范围和中性区。结果采用直径3.5 mm的钛棒,2.0 mm的细棒以及3.5 mm的PEEK棒固定后,在前屈、后伸、侧弯和旋转方向上均显著减小了固定节段的运动范围(P<0.05)。直径3.5 mm和2.0 mm的棒固定后的运动范围,在各个方向上无显著性差异。PEEK棒固定的运动范围仅在侧弯方向上大于坚强固定(P=0.005),其他方向无显著性差异。3种固定方式在屈伸、侧弯和旋转方向上均显著减小了固定节段的中性区(P<0.05)。各种固定方式之间相比较,无显著性差异(P>0.05)。结论在寰枢关节采用直径2.0 mm的细棒固定,与坚强固定的稳定性相当。采用直径3.5 mm的PEEK棒固定,在前屈、后伸、旋转方向上与坚强固定的稳定性相当,在侧弯方向上弱于坚强固定。 相似文献
3.
4.
5.
6.
7.
8.
Raymond J. Chan RN PhD Vivienne E. Milch MBBS MHPol Fiona Crawford-Williams PhD Oluwaseyifunmi Andi Agbejule BRadTherapy Ria Joseph MNutrDiet Jolyn Johal BND Narayanee Dick BSc Matthew P. Wallen PhD Julie Ratcliffe PhD Anupriya Agarwal MBBS Larissa Nekhlyudov MD Matthew Tieu PhD Manaf Al-Momani BPharm Scott Turnbull PhD Rahul Sathiaraj MPH Dorothy Keefe MBBS MD Nicolas H. Hart PhD 《CA: a cancer journal for clinicians》2023,73(6):565-589
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.
A Coupled FEM-BEM Approach for the Solution of the Free-Boundary Axi-Symmetric Plasma Equilibrium Problem 下载免费PDF全文
M. Bonotto D. Abate P. Bettini & F. Villone 《Communications In Computational Physics》2022,31(1):27-59
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.
Clinical & Experimental Metastasis - 相似文献