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   974篇
  免费   39篇
  国内免费   21篇
  1034篇
  2024年   6篇
  2023年   23篇
  2022年   31篇
  2021年   22篇
  2020年   34篇
  2019年   37篇
  2018年   28篇
  2017年   36篇
  2016年   32篇
  2015年   15篇
  2014年   69篇
  2013年   148篇
  2012年   13篇
  2011年   49篇
  2010年   41篇
  2009年   65篇
  2008年   49篇
  2007年   59篇
  2006年   48篇
  2005年   43篇
  2004年   30篇
  2003年   29篇
  2002年   18篇
  2001年   21篇
  2000年   20篇
  1999年   13篇
  1998年   10篇
  1997年   5篇
  1996年   3篇
  1995年   6篇
  1994年   11篇
  1993年   4篇
  1992年   3篇
  1991年   1篇
  1990年   7篇
  1989年   2篇
  1988年   2篇
  1985年   1篇
排序方式: 共有1034条查询结果,搜索用时 15 毫秒
41.
炎症性肠病(IBD)病程迁延反复,影响患者生活质量,耗费卫生资源。虽然传统药物如5-氨基水杨酸、糖皮质激素、免疫抑制剂等仍是目前治疗主流,但是大量有关发病机制的研究以及循证医学的发展对IBD的治疗产生了积极的推进作用。IBD的治疗正步入免疫调节的生物学时代,多种新型生物制剂的出现为IBD的治疗提供了新的策略和选择。现就目前IBD药物治疗现状以及最新进展进行综述,以期对临床IBD治疗提供参考。  相似文献   
42.
流行病学数据的更新表明阿尔茨海默病(A D )已成为全球健康问题。早期应用生物标志物的AD新诊断标准广泛应用和临床试验不断失败的鲜明反差提示AD治疗的艰巨性。AD和其他慢性疾病的共病研究不断深入。生活方式干预作为非药物治疗备受重视。  相似文献   
43.
探讨实施卫生部所颁发的手足口病诊疗与防控指南存在的难点.通过实践,依据指南,笔者将近几年工作中所遇到处理各种肠道病毒感染病例存在的问题加以分析,列出实施指南存在诸多临床及非临床的影响因素,包括:(1)上报、隔离引起的矛盾;(2)诊断、治疗、转诊引起的矛盾;(3)处理肠道病毒71型(EV71)感染、疱疹性咽峡炎等与手足口病的矛盾.较多的矛盾令基层医院依照目前的指南难以良好地开展工作,期待更完善的指南以及各地医疗主管部门制定切合实际的、可行的、各种具体的防控预案.  相似文献   
44.
《Body image》2014,11(4):331-336
This study examined the moderating effect of body surveillance on the relationship between fat stereotype endorsement and body dissatisfaction in normal weight women. Participants (N = 225) completed online measures of fat stereotyping, body surveillance, body dissatisfaction, and internalized thin ideals. After accounting for thin ideals, body surveillance moderated the relationship between fat stereotypes and body dissatisfaction. Contrary to hypotheses, higher fat stereotype endorsement predicted lower body dissatisfaction in women with higher body surveillance. Conversely, higher fat stereotype endorsement predicted greater body dissatisfaction in women with lower body surveillance. Thus, endorsing fat stereotypes appears protective against body dissatisfaction in normal weight women who extensively engage in body surveillance. For women who hold fat stereotypes and report high body surveillance, we propose that downward appearance comparison may create a contrast between themselves and the people with overweight whom they denigrate, thus improving body dissatisfaction.  相似文献   
45.
《Body image》2014,11(4):488-500
Social comparison (i.e., body, eating, exercise) and body surveillance were tested as mediators of the thin-ideal internalization-body dissatisfaction relationship in the context of an elaborated sociocultural model of disordered eating. Participants were 219 college women who completed two questionnaire sessions 3 months apart. The cross-sectional elaborated sociocultural model (i.e., including social comparison and body surveillance as mediators of the thin-ideal internalization-body dissatisfaction relation) provided a good fit to the data, and the total indirect effect from thin-ideal internalization to body dissatisfaction through the mediators was significant. Social comparison emerged as a significant specific mediator while body surveillance did not. The mediation model did not hold prospectively; however, social comparison accounted for unique variance in body dissatisfaction and disordered eating 3 months later. Results suggest that thin-ideal internalization may not be “automatically” associated with body dissatisfaction and that it may be especially important to target comparison in prevention and intervention efforts.  相似文献   
46.
观察Narcotrend监测下右美托咪定联合丙泊酚靶控输注用于冠心病患者非心脏手术麻醉诱导时对血流动力学的影响.合并冠心痛行非心脏手术患者40例,随机分为两组:Dex组(n=20,患者在诱导前静脉泵注右美托咪定0.5μg/kg,15min内输注完毕),对照组(n=20,等量生理盐水,方法同Dex组).记录给药前后及诱导期间患者的血流动力学变化.对照组在气管插管即刻以及气管插管3min后血流动力学指标值均高于插管前,气管插管5min后平均动脉压(MAP)低于插管前(P<0.05),Dex组无明显差异.麻醉诱导前15min静脉注射0.5μg/kg右美托咪定可以使冠心病患者丙泊酚靶控输注诱导期间血流动力学更加平稳.  相似文献   
47.
经皮肺活检对肺部病变的诊断价值   总被引:1,自引:0,他引:1  
经皮肺活检技术应用已有100多年历史。随着影像技术的不断进步,目前已发展成为肺部疾病的重要诊断技术。本文综述了经皮肺活检对肺部病变的诊断价值。并探讨和比较了不同引导技术的特点,以及适应症、并发症及其处理。  相似文献   
48.
To investigate everyday memory, more and more studies rely on virtual‐reality applications to bridge the gap between in situ approaches and laboratory settings. In this vein, the present study was designed to assess everyday‐like memory from the virtual reality‐based Human Object Memory for Everyday Scenes (HOMES) test (Sauzéon et al., 2012 , Exp. Psychol., 59, 99) in ageing and in Alzheimer's disease (AD). Two aims motivated this study: the first was to assess multiple processes of episodic memory (EM) functioning embedded within contexts closely related to real life in ageing and AD using the multi‐trial free‐recall paradigm, and the second aim was to evaluate the mediating effects of executive functioning (EF), EM, and subjective memory complaints (SMCs) on age differences in the HOMES measures and in AD. To this end, the HOMES test and neurocognitive tests of EF and EM were administered to 23 younger adults, 23 older adults, and 16 patients with AD. The results were: firstly, compared to young adults, elderly adults presented only free‐recall decline that almost disappeared in recognition condition whereas AD patients exhibited a poor clustering, learning, and recognition performance, and also a high amount of false recognition; secondly, age differences as well as AD related deficits on the HOMES test were mediated by both memory and EF measure while those observed on false memory indices were only mediated by EM measure; thirdly, the HOMES indices are related to SMCs even when episodic or EF measures are controlled. Overall, the results supported the fact that the VR‐based memory test is an appropriate device to capture age‐related differences as well as the AD effect with respect to both in situ and laboratory settings.  相似文献   
49.
Antepartum Foetal surveillance is the most vital epoch of investigation during the pregnancy period. This surveillance would provide an opening to plan and manage the Foetus during Intrapartum and Antepartum stages of pregnancy. Moreover, it will help to identify high risk Foetuses during pregnancies which are complicated by maternal health conditions like diabetes mellitus, intrauterine growth restriction, etc. The foetal electrocardiogram (fECG) signal can be detected in the course of pregnancy from the Antepartum stage. Generally, fECG signal analysis is not carried out for Foetal surveillance. Rather, the traditional methodologies like phonocardiogram, etc. are being utilized. The reason is the unavailability of an effective methodology for providing good quality fECG signal. The proposal of a hybrid tactic called Bayesian Deep Belief Network (BDBN) for fECG signal enhancement is presented in this article. The proposed BDBN technique involves Baye’s filtering methodology in amalgamation with Deep Belief Network. The Baye’s filtering was employed to eliminate undesired signal components. Deep learning (DL) technique was utilized with Deep belief network (DBN) to extract high quality fECG signal. The methodology resulted with good quality fECG signal which is indeed valuable for timely Physician analysis.  相似文献   
50.
The aim of this meta-analysis was to evaluate the effects of disease education or pulmonary rehabilitation programs assisted with telephone support on physical capacity and quality of life (QOL) in chronic obstructive pulmonary disease (COPD) patients. A systematic search of PubMed, Embase, Web of Science and The Cochrane Library was conducted until May 2017. Randomized controlled trials (RCTs) examining the effects of telephone-assisted intervention versus a control group on exercise tolerance and QOL in patients with COPD were included. Two independent authors assessed the methodological quality of the trials using the Cochrane risk of bias tool. A meta-analysis was conducted with the Revman5.3 to quantify the effects of telephone-assisted interventions on walking capacity and QOL. In total, 10 studies involving 1037 participants were included. Due to the effect of telephone-assisted interventions, statistically significant results were found on Saint-George’s Respiratory Questionnaire (SGRQ) symptom scores [standard mean difference (SMD) ?.18, 95% confidence interval (CI) ?.33, ?.03, p-value .02)], SGRQ impact scores [SMD ?.35, 95% CI ?.60, ?.10, p-value .006)], SGRQ activity scores [SMD ?.30, 95% CI ?.45, ?.15, p-value < .0001)], SGRQ total score [SMD ?.36, 95% CI ?.51, ?.21, p-value < .00001)]. The effects on 6-min walk test (6MWT) and all Chronic Respiratory Questionnaire (CRQ) subscales were not significant (p > .05) based on the insufficient evidence. In conclusion, the role of telephone-assisted interventions in the management of COPD remains equivocal. Some encouraging results were seen with regard to SGRQ symptom, SGRQ impact, SGRQ activity and SGRQ total score. We believe that more methodologically rigorous large-scale randomized controlled trials are necessary to answer this study question.  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