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   1381112篇
  免费   118521篇
  国内免费   6457篇
耳鼻咽喉   17247篇
儿科学   44336篇
妇产科学   37693篇
基础医学   189813篇
口腔科学   37321篇
临床医学   125608篇
内科学   286492篇
皮肤病学   32470篇
神经病学   114729篇
特种医学   57049篇
外国民族医学   274篇
外科学   217479篇
综合类   32250篇
现状与发展   3篇
一般理论   462篇
预防医学   110737篇
眼科学   29238篇
药学   96879篇
  5篇
中国医学   2363篇
肿瘤学   73642篇
  2018年   14486篇
  2017年   11431篇
  2016年   13593篇
  2015年   15198篇
  2014年   21415篇
  2013年   31677篇
  2012年   39266篇
  2011年   42083篇
  2010年   26127篇
  2009年   25438篇
  2008年   39214篇
  2007年   41791篇
  2006年   42839篇
  2005年   41327篇
  2004年   39438篇
  2003年   38373篇
  2002年   36155篇
  2001年   66733篇
  2000年   68553篇
  1999年   57259篇
  1998年   17256篇
  1997年   15482篇
  1996年   16463篇
  1995年   16586篇
  1994年   15458篇
  1993年   14455篇
  1992年   47551篇
  1991年   46168篇
  1990年   44342篇
  1989年   42164篇
  1988年   39127篇
  1987年   38432篇
  1986年   36195篇
  1985年   34975篇
  1984年   26671篇
  1983年   22402篇
  1982年   14123篇
  1981年   12711篇
  1980年   11928篇
  1979年   23749篇
  1978年   17259篇
  1977年   14549篇
  1976年   13323篇
  1975年   13884篇
  1974年   16266篇
  1973年   15587篇
  1972年   14347篇
  1971年   13164篇
  1970年   12003篇
  1969年   11217篇
排序方式: 共有10000条查询结果,搜索用时 562 毫秒
11.
12.
Purpose

This paper describes the design of a theory-informed pragmatic intervention for adolescent perinatal depression in primary care in Nigeria.

Methods

We conducted Focus Group Discussions (FGDs) among 17 adolescent mothers and 25 maternal health care providers with experience in the receipt and provision of care for perinatal depression. The Consolidated Framework for Implementation Research (CFIR) was used to systematically examine the barriers and facilitators affecting adolescent mothers' use of an existing intervention package for depression. The Theoretical Domain Framework (TDF) and the Capability, Opportunity, Motivation, Behaviour (COM-B) model were used to analyze the results of the data across the five CFIR domains.

Results

FGD analysis revealed that care providers lacked knowledge on approaches to engage young mothers in treatment. Young mothers had poor treatment engagement, low social support, and little interest in parenting. A main characteristic of the newly designed intervention is the inclusion of age-appropriate psychoeducation supported with weekly mobile phone calls, to address treatment engagement and parenting behaviours of young mothers. Also in the outer setting, low social support from relatives was addressed with education, “as need arises” phone calls, and the involvement of "neighborhood mothers”. In the inner settings, care providers’ behaviour is addressed with training to increase their capacity to engage young mothers in treatment.

Conclusion

A theory-based approach helped develop an age-appropriate intervention package targeting depression and parenting skills deficit among perinatal adolescents in primary maternal care and in which a pragmatic use of mobile phone was key.

  相似文献   
13.
14.
15.
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   
16.
17.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36 weeks gestational age)...  相似文献   
18.

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   
19.
20.
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