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   9275篇
  免费   899篇
  国内免费   11篇
耳鼻咽喉   59篇
儿科学   254篇
妇产科学   206篇
基础医学   1173篇
口腔科学   221篇
临床医学   1058篇
内科学   1854篇
皮肤病学   113篇
神经病学   712篇
特种医学   305篇
外科学   1695篇
综合类   226篇
一般理论   26篇
预防医学   978篇
眼科学   75篇
药学   642篇
中国医学   53篇
肿瘤学   535篇
  2023年   61篇
  2022年   65篇
  2021年   134篇
  2020年   130篇
  2019年   188篇
  2018年   214篇
  2017年   156篇
  2016年   178篇
  2015年   169篇
  2014年   255篇
  2013年   364篇
  2012年   562篇
  2011年   546篇
  2010年   302篇
  2009年   283篇
  2008年   541篇
  2007年   475篇
  2006年   448篇
  2005年   474篇
  2004年   438篇
  2003年   357篇
  2002年   348篇
  2001年   264篇
  2000年   283篇
  1999年   220篇
  1998年   96篇
  1997年   87篇
  1996年   106篇
  1995年   76篇
  1994年   87篇
  1993年   74篇
  1992年   155篇
  1991年   181篇
  1990年   127篇
  1989年   121篇
  1988年   138篇
  1987年   168篇
  1986年   138篇
  1985年   123篇
  1984年   83篇
  1983年   68篇
  1982年   48篇
  1980年   58篇
  1979年   76篇
  1978年   59篇
  1977年   67篇
  1976年   47篇
  1975年   51篇
  1974年   64篇
  1972年   52篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
(1) Background: The aim of this study was to evaluate the effectiveness of a three-component nutrition, sleep, and physical activity (PA) program on cardiorespiratory fitness, body composition, and health behaviors in overweight airline pilots. (2) Methods: A parallel group study was conducted amongst 125 airline pilots. The intervention group participated in a 16-week personalized healthy eating, sleep hygiene, and PA program. Outcome measures of objective health (maximal oxygen consumption (VO2max), body mass, skinfolds, girths, blood pressure, resting heart rate, push-ups, plank hold) and self-reported health (weekly PA, sleep quality and duration, fruit and vegetable intake, and self-rated health) were collected at baseline and post-intervention. The wait-list control completed the same assessments. (3) Results: Significant group main effects in favor of the intervention group were found for all outcome measures (p < 0.001) except for weekly walking (p = 0.163). All objective health measures significantly improved in the intervention group when compared to the control group (p < 0.001, d = 0.41–1.04). Self-report measures (moderate-to-vigorous PA, sleep quality and duration, fruit and vegetable intake, and self-rated health) significantly increased in the intervention group when compared to the control group (p < 0.001, d = 1.00–2.69). (4) Conclusion: Our findings demonstrate that a personalized 16-week healthy eating, PA, and sleep hygiene intervention can elicit significant short-term improvements in physical and mental health outcomes among overweight airline pilots. Further research is required to examine whether the observed effects are maintained longitudinally.  相似文献   
142.
ABSTRACT: The purpose of the current study was to determine whether a tropical ginger derived compound 1'-acetoxychavicol acetate (ACA), suppresses skin tumor promotion in K5.Stat3C mice. In a two-week study in which wild-type (WT) and K5.Stat3C mice were co-treated with either vehicle, ACA, galanga extract, or fluocinolone acetonide (FA) and tetradecanoyl phorbol acetate (TPA), only the galanga extract and FA suppressed TPA-induced skin hyperproliferation and wet weight. None of these agents were effective at suppressing pTyr705 Stat3 expression. However, ACA and FA showed promising inhibitory effects against skin tumorigenesis in K5.Stat3C mice. ACA also suppressed phospho-p65 NF-kappaB activation, suggesting a potential mechanism for its action.  相似文献   
143.
144.
This article provides a comprehensive literature review regarding side effects both minor and major associated with contrast agent injection. This includes a discussion of nephrogenic systemic fibrosis (NSF), which remains highly topical. Radiographers now commonly are responsible for injection of contrast agent in patients, in keeping with their extended role. Therefore it is incumbent on them to understand the agents they inject, the contra-indications for injection and any potential associated risks, so that they can act and react accordingly in a timely manner. The need for this knowledge was made very evident after the recent death of a patient from anaphylactic shock when there was a delay in mounting the appropriate procedure. This paper represents a synthesis of relevant articles and reflects on the results, before drawing appropriate conclusions particularly those of special relevance to radiographers.  相似文献   
145.
The research-related performance of universities, as well as that of individual researchers, is increasingly evaluated through the use of objective measures, or metrics, which seek to support or in some cases even replace more traditional methods of peer review. In particular there is a growing awareness in research communities, government organisations and funding bodies around the concept of using evaluation metrics to analyse research citations. The tools available for ‘citation analysis’ are many and varied, enabling a quantification of scientific quality, academic impact and prestige. However there is increasing concern regarding the potential misuse of such tools, which have limitations in certain research disciplines.This article uses ‘real world’ examples from radiography research and scholarship to illustrate the range of currently available citation analysis tools. It explores the academic debate surrounding their strengths and limitations, and identifies the potential impact of citation analysis on the radiography research community.The article concludes that citation analysis is a valuable tool for researchers to use for personal reflection and research planning, yet there are inherent dangers if it is used inappropriately. Whilst citation analysis can give objective information regarding an individual, research group, journal or higher education institution, it should not be used as a total substitute for traditional qualitative review and peer assessment.  相似文献   
146.
The purpose of this study was to determine the plasma, erythrocyte, and mononuclear blood cell (MBC) magnesium concentrations in patients with chronic, severe hypomagnesemia due to a chronic magnesium-wasting tubulopathy.

Six patients with Bartter's syndrome and five patients with magnesium-wasting tubulopathy were compared with normal subjects. We determined magnesium in plasma, erythrocytes, and MBCs.

Patients with chronic magnesium-wasting tubulopathy had a significantly lower plasma magnesium concentration than controls, but erythrocyte magnesium concentration and MBC magnesium concentration and content did not differ significantly between patients and controls.

Two disorders with chronic magnesium-wasting tubulopathies are associated with a low plasma magnesium concentration but normal erythrocyte and MBC magnesium.  相似文献   
147.
148.
149.
The aims of this study were to develop an eating disorder scenarios tool to assess the motivational interviewing (MI) skills of caregivers and evaluate the coding reliability of the instrument, and to test the sensitivity to change through a pre/post/follow-up design. The resulting Motivational Interview Scenarios Tool for Eating Disorders (MIST-ED) was administered to caregivers (n = 66) who were asked to provide oral and written responses before and after a skills-based intervention, and at a 3-month follow-up. Raters achieved excellent inter-rater reliability (intra-class correlations of 91.8% on MI adherent and 86.1% for MI non-adherent statements for written scenarios and 89.2%, and 85.3% for oral scenarios). Following the intervention, MI adherent statements increased (baseline = 9.4%, post = 61.5% and follow-up 47.2%) and non-MI adherent statements decreased (baseline = 90.6%, post = 38.5% and follow-up = 52.8%). This instrument can be used as a simple method to measure the acquisition of MI skills to improve coping and both response methods are adequate. The tool shows good sensitivity to improved skills.  相似文献   
150.
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