全文获取类型
收费全文 | 1329892篇 |
免费 | 104646篇 |
国内免费 | 5056篇 |
专业分类
耳鼻咽喉 | 19142篇 |
儿科学 | 45230篇 |
妇产科学 | 35540篇 |
基础医学 | 187746篇 |
口腔科学 | 34493篇 |
临床医学 | 117056篇 |
内科学 | 265375篇 |
皮肤病学 | 28645篇 |
神经病学 | 103188篇 |
特种医学 | 53468篇 |
外国民族医学 | 672篇 |
外科学 | 202902篇 |
综合类 | 37048篇 |
现状与发展 | 20篇 |
一般理论 | 381篇 |
预防医学 | 100090篇 |
眼科学 | 28853篇 |
药学 | 100218篇 |
57篇 | |
中国医学 | 5706篇 |
肿瘤学 | 73764篇 |
出版年
2021年 | 10569篇 |
2019年 | 10646篇 |
2018年 | 14795篇 |
2017年 | 11596篇 |
2016年 | 12430篇 |
2015年 | 14887篇 |
2014年 | 20185篇 |
2013年 | 29744篇 |
2012年 | 41027篇 |
2011年 | 43297篇 |
2010年 | 26642篇 |
2009年 | 24913篇 |
2008年 | 40122篇 |
2007年 | 42401篇 |
2006年 | 42425篇 |
2005年 | 40847篇 |
2004年 | 39435篇 |
2003年 | 38164篇 |
2002年 | 37085篇 |
2001年 | 64820篇 |
2000年 | 67168篇 |
1999年 | 56886篇 |
1998年 | 15401篇 |
1997年 | 14001篇 |
1996年 | 14421篇 |
1995年 | 13685篇 |
1994年 | 12943篇 |
1993年 | 11917篇 |
1992年 | 44682篇 |
1991年 | 43593篇 |
1990年 | 42335篇 |
1989年 | 40221篇 |
1988年 | 36988篇 |
1987年 | 36329篇 |
1986年 | 33709篇 |
1985年 | 32384篇 |
1984年 | 24229篇 |
1983年 | 20355篇 |
1982年 | 11807篇 |
1981年 | 10769篇 |
1979年 | 21408篇 |
1978年 | 14890篇 |
1977年 | 12591篇 |
1976年 | 11745篇 |
1975年 | 12683篇 |
1974年 | 14715篇 |
1973年 | 14171篇 |
1972年 | 12981篇 |
1971年 | 11766篇 |
1970年 | 11097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 对比研究朝鲜淫羊藿酸性多糖酯化还原前后的理化特性,并探讨其改善油酸诱导的肝癌HepG2细胞脂质堆积活性的差异。方法 采用高效凝胶渗透色谱法测定朝鲜淫羊藿酸性多糖(EFPA)的均一性和分子量,高效液相色谱法测定EFPA和酯化还原后朝鲜淫羊藿酸性多糖(EFPA-R)的单糖组成;采用油酸(OA)处理HepG2细胞诱导建立脂质蓄积模型,不同浓度EFPA与EFPA-R(10、30、100、300 μg·mL-1)分别和OA共同作用于细胞24 h,采用CCK-8试剂盒测定细胞存活率,油红O染色观察细胞内脂滴蓄积情况,并采用试剂盒测定细胞内总胆固醇(TC)、甘油三酯(TG)含量。结果 EFPA为成分均一的多糖组分,分子量为125.8 kDa,由甘露糖、葡萄糖、半乳糖、葡萄糖醛酸和阿拉伯糖组成,摩尔比为1.7∶7.4∶1.4∶1.8∶1.0,葡萄糖占比最大,EFPA-R由甘露糖、葡萄糖、半乳糖和阿拉伯糖组成,摩尔比为0.8∶10.6∶2.1∶1.0;在10-300 μg·mL-1范围内,EFPA和EFPA-R对HepG2细胞的抑制作用较弱,作为给药浓度;与空白组相比,模型组细胞中TC、TG含量显著升高(P < 0.01),细胞内红色脂滴显著增多,与模型组相比,EFPA可显著降低细胞中TC、TG含量(P < 0.01),明显减少细胞内红色脂滴(P < 0.05或P < 0.01),EFPA-R干预后细胞则无明显变化。结论 EFPA可明显改善HepG2细胞脂质堆积情况,且呈现剂量依赖性,而半乳糖醛酸(GalA)的存在可能是其抑制HepG2细胞脂质蓄积的关键因素。 相似文献
4.
5.
6.
7.
8.
9.
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
10.
A Coupled FEM-BEM Approach for the Solution of the Free-Boundary Axi-Symmetric Plasma Equilibrium Problem
下载免费PDF全文
![点击此处可从《Communications In Computational Physics》网站下载免费的PDF全文](/ch/ext_images/free.gif)
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