全文获取类型
收费全文 | 2142994篇 |
免费 | 165773篇 |
国内免费 | 7880篇 |
专业分类
耳鼻咽喉 | 28832篇 |
儿科学 | 69090篇 |
妇产科学 | 59122篇 |
基础医学 | 297666篇 |
口腔科学 | 60038篇 |
临床医学 | 186708篇 |
内科学 | 439354篇 |
皮肤病学 | 50014篇 |
神经病学 | 174417篇 |
特种医学 | 85770篇 |
外国民族医学 | 597篇 |
外科学 | 332646篇 |
综合类 | 47514篇 |
现状与发展 | 2篇 |
一般理论 | 664篇 |
预防医学 | 169198篇 |
眼科学 | 47070篇 |
药学 | 152057篇 |
5篇 | |
中国医学 | 4160篇 |
肿瘤学 | 111723篇 |
出版年
2018年 | 24399篇 |
2017年 | 18478篇 |
2016年 | 20640篇 |
2015年 | 23260篇 |
2014年 | 32275篇 |
2013年 | 48970篇 |
2012年 | 64078篇 |
2011年 | 68415篇 |
2010年 | 41523篇 |
2009年 | 39127篇 |
2008年 | 63438篇 |
2007年 | 67769篇 |
2006年 | 68209篇 |
2005年 | 66539篇 |
2004年 | 63086篇 |
2003年 | 61092篇 |
2002年 | 58776篇 |
2001年 | 98694篇 |
2000年 | 101906篇 |
1999年 | 85474篇 |
1998年 | 24851篇 |
1997年 | 22325篇 |
1996年 | 23019篇 |
1995年 | 22590篇 |
1994年 | 21230篇 |
1993年 | 19851篇 |
1992年 | 68946篇 |
1991年 | 66565篇 |
1990年 | 64481篇 |
1989年 | 61521篇 |
1988年 | 57067篇 |
1987年 | 56035篇 |
1986年 | 53310篇 |
1985年 | 51172篇 |
1984年 | 38838篇 |
1983年 | 32809篇 |
1982年 | 20257篇 |
1981年 | 18017篇 |
1980年 | 17064篇 |
1979年 | 35266篇 |
1978年 | 25264篇 |
1977年 | 21326篇 |
1976年 | 19802篇 |
1975年 | 21149篇 |
1974年 | 25050篇 |
1973年 | 23958篇 |
1972年 | 22444篇 |
1971年 | 20714篇 |
1970年 | 19227篇 |
1969年 | 18123篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
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
23.
24.
25.
26.
27.
Brittney H. Cotta Margaret F. Meagher Aaron Bradshaw Stephen T. Ryan Gerant Rivera-Sanfeliz 《Expert review of anticancer therapy》2019,19(4):301-308
Introduction: Percutaneous renal mass biopsy has evolved over the last decade with improvements on previous pitfalls including low tissue yield, high non-diagnostic rates, and complications. As understanding of tumor biology and natural history of renal cortical neoplasms has improved, percutaneous renal mass biopsy is poised to have an expanding role in an area characterized by individualized management and refined risk stratification.
Areas covered: This review summarizes the evolution of renal mass biopsy to its current state with respect to outcomes, indications, and clinical guidelines.
Expert opinion: With improved understanding of differential biological potential of renal cortical neoplasms combined with technical improvements in diagnostic yield and accuracy, utilization of renal mass biopsy is becoming an important adjunct to patient care in a broad range of clinical scenarios, including active surveillance, thermal ablation, and use of primary systemic therapy in localized and advanced settings. 相似文献
28.
María del Carmen Azorín Samper Marta Hernandorena Gonzlez Alberto Ibez Arias Sandra Díaz Sierra Marta Bertolo Domínguez Flix Checa Ayet 《The breast journal》2020,26(2):252-254
Breast pseudoaneurysms after a core needle biopsy are a rare complication with a low incidence. However, it is important to be aware of the possibility of complications that require treatment. 相似文献
29.
Breanne E. Kunstler Jill L. Cook Joanne L. Kemp Paul D. O’Halloran Caroline F. Finch 《Journal of Science and Medicine in Sport》2019,22(1):2-10
Objectives
To determine: (i) the behaviour change techniques used by a sample of Australian physiotherapists to promote non-treatment physical activity; and (ii) whether those behaviour change techniques are different to the techniques used to encourage adherence to rehabilitation exercises.Design
Cross-sectional survey.Method
An online self-report survey was advertised to private practice and outpatient physiotherapists treating patients with musculoskeletal conditions. The use of 50 behaviour change techniques were measured using five-point Likert-type scale questions.Results
Four-hundred and eighty-six physiotherapists responded to the survey, with 216 surveys fully completed. Most respondents (85.1%) promoted non-treatment physical activity often or all of the time. Respondents frequently used 29 behaviour change techniques to promote non-treatment physical activity or encourage adherence to rehabilitation exercises. A similar number of behaviour change techniques was frequently used to encourage adherence to rehabilitation exercises (n = 28) and promote non-treatment physical activity (n = 26). Half of the behaviour change techniques included in the survey were frequently used for both promoting non-treatment physical activity and encouraging adherence to rehabilitation exercises (n = 25). Graded tasks was the most, and punishment was the least, frequently reported technique used to promote non-treatment physical activity and encourage adherence to rehabilitation exercises.Conclusions
Respondents reported using similar behaviour change techniques to promote non-treatment physical activity and encourage adherence to rehabilitation exercises. The variability in behaviour change technique use suggests the behaviour the physiotherapist is promoting influences their behaviour change technique choice. Including the frequently-used behaviour change techniques in non-treatment physical activity promotion interventions might improve their efficacy. 相似文献30.
Widder Randolf A. Lappas Alexandra Rennings Corinna Hild Matthias Roessler Gernot F. Dietlein Thomas S. 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2020,258(11):2581-2581
Graefe's Archive for Clinical and Experimental Ophthalmology - The published online version contains mistake as the author's first name and last name have been interchanged as "Hild... 相似文献