全文获取类型
收费全文 | 1446714篇 |
免费 | 107659篇 |
国内免费 | 2503篇 |
专业分类
耳鼻咽喉 | 20504篇 |
儿科学 | 49169篇 |
妇产科学 | 39166篇 |
基础医学 | 206544篇 |
口腔科学 | 39103篇 |
临床医学 | 122707篇 |
内科学 | 294610篇 |
皮肤病学 | 32348篇 |
神经病学 | 115506篇 |
特种医学 | 55750篇 |
外国民族医学 | 661篇 |
外科学 | 216250篇 |
综合类 | 27834篇 |
现状与发展 | 1篇 |
一般理论 | 416篇 |
预防医学 | 114455篇 |
眼科学 | 32198篇 |
药学 | 107699篇 |
3篇 | |
中国医学 | 3031篇 |
肿瘤学 | 78921篇 |
出版年
2021年 | 11564篇 |
2019年 | 12677篇 |
2018年 | 18645篇 |
2017年 | 13555篇 |
2016年 | 14663篇 |
2015年 | 16597篇 |
2014年 | 22182篇 |
2013年 | 33390篇 |
2012年 | 47875篇 |
2011年 | 50299篇 |
2010年 | 28935篇 |
2009年 | 26576篇 |
2008年 | 46602篇 |
2007年 | 49660篇 |
2006年 | 49318篇 |
2005年 | 47916篇 |
2004年 | 45996篇 |
2003年 | 44283篇 |
2002年 | 43109篇 |
2001年 | 67586篇 |
2000年 | 70443篇 |
1999年 | 59550篇 |
1998年 | 15951篇 |
1997年 | 14307篇 |
1996年 | 14728篇 |
1995年 | 13920篇 |
1994年 | 13165篇 |
1993年 | 12122篇 |
1992年 | 46336篇 |
1991年 | 45065篇 |
1990年 | 43725篇 |
1989年 | 41445篇 |
1988年 | 38161篇 |
1987年 | 37415篇 |
1986年 | 34811篇 |
1985年 | 33453篇 |
1984年 | 25004篇 |
1983年 | 20958篇 |
1982年 | 12096篇 |
1981年 | 10981篇 |
1979年 | 22299篇 |
1978年 | 15464篇 |
1977年 | 13157篇 |
1976年 | 12312篇 |
1975年 | 13361篇 |
1974年 | 15629篇 |
1973年 | 15112篇 |
1972年 | 13911篇 |
1971年 | 12656篇 |
1970年 | 11916篇 |
排序方式: 共有10000条查询结果,搜索用时 750 毫秒
11.
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
12.
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
13.
Clinical & Experimental Metastasis - 相似文献
14.
15.
Xiumei Jiang Xiaowei Zhang Patrick Gray Jiwen Zheng Timothy R. Croley Peter P. Fu 《journal of environmental science and health part c-environmental carcinogenesis & ecotoxicology reviews》2019,37(2):116-131
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
16.
María C. Lanuza-López Sandra G. Martínez-Garza Jesús F. Solórzano-Vázquez Daniela Paz-Cervantes Claudia González-Ortega Israel Maldonado-Rosas 《Gynecological endocrinology》2020,36(9):829-834
AbstractOocyte maturation defect is a challenging situation in the management of infertility, the etiology may be related to endocrine causes, protocols used in ovarian stimulation, oocyte intrinsic defects or procedures in embryology laboratory. We report three Mexican females in treatment for primary infertility with non-mature oocytes after ovary stimulation and oocyte capture in whom a genetic diagnosis of TUBB8-oocyte maturation defect was revealed by exome sequencing. Two couples achieved pregnancies though oocyte donation after establishing the genetic etiology. Our results expand the role of TUBB8-disorders in patients of non-Asian ethnicity. Oocyte maturation defects of monogenic origin are a growing group of disorders that endocrinologists and reproductive medicine specialists should be aware in order to provide referral to genetics for establish a correct and opportune diagnosis. 相似文献
17.
Rupa Narayan MD Traci M. Blonquist MS Ashkan Emadi MD PhD Robert P. Hasserjian MD Meghan Burke BS Christopher Lescinskas BS Donna S. Neuberg ScD Andrew M. Brunner MD Gabriela Hobbs MD Hanno Hock MD PhD Steven L. McAfee MD Yi-Bin Chen MD Eyal Attar MD Timothy A. Graubert MD Christina Bertoli MSN Jenna A. Moran MSN Meghan K. Bergeron MSN Julia E. Foster MSN Aura Y. Ramos BSN Tina T. Som BSN Megan K. Vartanian BSN RN Jennifer L. Story LPN Kristin McGregor MS Molly Macrae BS Tanya Behnan BS Margaret C. Wey PhD Jessica Rae BSN Frederic I. Preffer PhD Patricia Lesho BA Vu H. Duong MD Mason L. Mann BA Karen K. Ballen MD Christine Connolly BS Philip C. Amrein MD Amir T. Fathi MD 《Cancer》2020,126(6):1264-1273
18.
19.
20.