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   316131篇
  免费   19496篇
  国内免费   1182篇
耳鼻咽喉   3608篇
儿科学   10198篇
妇产科学   7082篇
基础医学   44482篇
口腔科学   12167篇
临床医学   26852篇
内科学   69957篇
皮肤病学   7587篇
神经病学   29101篇
特种医学   9218篇
外国民族医学   30篇
外科学   34870篇
综合类   2154篇
现状与发展   2篇
一般理论   144篇
预防医学   31561篇
眼科学   5509篇
药学   20850篇
中国医学   1165篇
肿瘤学   20272篇
  2023年   2094篇
  2022年   3235篇
  2021年   8528篇
  2020年   5521篇
  2019年   7774篇
  2018年   9698篇
  2017年   7293篇
  2016年   7497篇
  2015年   8511篇
  2014年   11386篇
  2013年   14722篇
  2012年   22540篇
  2011年   23377篇
  2010年   12357篇
  2009年   10993篇
  2008年   18457篇
  2007年   19071篇
  2006年   17509篇
  2005年   17397篇
  2004年   15997篇
  2003年   14578篇
  2002年   12063篇
  2001年   6185篇
  2000年   5979篇
  1999年   5535篇
  1998年   2739篇
  1997年   2281篇
  1996年   2055篇
  1995年   1751篇
  1994年   1715篇
  1993年   1497篇
  1992年   3306篇
  1991年   3090篇
  1990年   2833篇
  1989年   2807篇
  1988年   2546篇
  1987年   2334篇
  1986年   2216篇
  1985年   2088篇
  1984年   1563篇
  1983年   1308篇
  1982年   835篇
  1981年   725篇
  1980年   707篇
  1979年   1103篇
  1978年   750篇
  1977年   607篇
  1975年   652篇
  1974年   645篇
  1973年   637篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Journal of Medical Ultrasonics - Chronic liver disease is still a major problem because disease progression will ultimately lead to liver cirrhosis. Portal hypertension is the hallmark in advanced...  相似文献   
3.
4.
5.

Background

Hyperglycaemia is common in patients with acute brain injury admitted to an intensive care unit (ICU). Many studies have found associations between development of hyperglycaemia and increased mortality in hospitalised patients. However, the optimal target for blood glucose control is unknown. We want to conduct a systematic review with meta-analysis and trial sequential analysis to explore the beneficial and harmful effects of restrictive versus liberal glucose control on patient outcomes in adults with severe acute brain injury.

Methods

We will systematically search medical databases including CENTRAL, Embase, MEDLINE and trial registries. We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL, PubMed, EMBASE, Science Citation Index Expanded and CINAHL. Two authors will independently review and select trials and extract data. We will include randomised trials comparing levels of glucose control in our analyses and observational studies will be included to address potential harms. The primary outcomes are defined as all-cause mortality, functional outcome and health-related quality of life. Secondary outcomes include serious adverse events including hypoglycaemia, length of ICU stay and duration of mechanical ventilation, and explorative outcomes including intracranial pressure and infection. Trial Sequential Analysis will be used to investigate the risk of type I error due to repetitive testing and to further explore imprecision. Quality of trials will be evaluated using the Cochrane Risk of Bias tool, and quality of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.

Discussion

The results of the systematic review will be disseminated through peer-reviewed publication. With the review, we hope to inform future randomised clinical trials and improve clinical practice.  相似文献   
6.
7.
8.

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   
9.
10.
The regulation of food intake is a complex mechanism, and the hypothalamus is the main central structure implicated. In particular, the arcuate nucleus appears to be the most critical area in the integration of multiple peripheral signals.Among these signals, those originating from the white adipose tissue and the gastrointestinal tract are known to be involved in the regulation of food intake.The present paper focuses on adiponectin, an adipokine secreted by white adipose tissue, which is reported to have a role in the control of feeding by acting centrally. The recent observation that adiponectin is also able to influence gastric motility raises the question of whether this action represents an additional peripheral mechanism that concurs with the central effects of the hormone on food intake. This possibility, which represents an emerging aspect correlating the central and peripheral effects of adiponectin in the hunger-satiety cycle, is discussed in the present paper.  相似文献   
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