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   21297篇
  免费   1579篇
  国内免费   332篇
耳鼻咽喉   269篇
儿科学   659篇
妇产科学   477篇
基础医学   2671篇
口腔科学   253篇
临床医学   1923篇
内科学   3777篇
皮肤病学   349篇
神经病学   1435篇
特种医学   682篇
外国民族医学   5篇
外科学   2569篇
综合类   1116篇
现状与发展   3篇
一般理论   24篇
预防医学   3061篇
眼科学   515篇
药学   1449篇
  20篇
中国医学   450篇
肿瘤学   1501篇
  2024年   54篇
  2023年   263篇
  2022年   555篇
  2021年   817篇
  2020年   464篇
  2019年   627篇
  2018年   734篇
  2017年   565篇
  2016年   574篇
  2015年   703篇
  2014年   938篇
  2013年   1186篇
  2012年   1689篇
  2011年   1677篇
  2010年   1056篇
  2009年   839篇
  2008年   1214篇
  2007年   1306篇
  2006年   1208篇
  2005年   1020篇
  2004年   934篇
  2003年   868篇
  2002年   737篇
  2001年   381篇
  2000年   330篇
  1999年   278篇
  1998年   110篇
  1997年   108篇
  1996年   82篇
  1995年   79篇
  1994年   70篇
  1993年   47篇
  1992年   152篇
  1991年   141篇
  1990年   159篇
  1989年   175篇
  1988年   142篇
  1987年   142篇
  1986年   113篇
  1985年   102篇
  1984年   73篇
  1983年   57篇
  1982年   23篇
  1981年   30篇
  1980年   24篇
  1979年   45篇
  1975年   29篇
  1974年   21篇
  1973年   23篇
  1972年   21篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
声带运动障碍的病因和临床表现复杂多变,涉及多学科,从病因上分为神经源性和非神经源性。对于神经源性声带运动障碍的诊治,首先通过喉镜等检查明确有无声带运动障碍及严重程度,值得注意的是声带纵向张力变化障碍也属于运动障碍的范畴;然后采用喉肌电图(LEMG)检查进行定性分析,在确诊神经源性损伤后,进一步对神经损伤部位进行定位诊断并查找导致神经损伤的病因;同时根据喉部神经电生理评估结果,判断预后。最后综合上述的评估结果制定相应的治疗策略。  相似文献   
3.
4.
5.
6.
Facial motion is a primary source of social information about other humans. Prior fMRI studies have identified regions of the superior temporal sulcus (STS) that respond specifically to perceived face movements (termed fSTS), but little is known about the nature of motion representations in these regions. Here we use fMRI and multivoxel pattern analysis to characterize the representational content of the fSTS. Participants viewed a set of specific eye and mouth movements, as well as combined eye and mouth movements. Our results demonstrate that fSTS response patterns contain information about face movements, including subtle distinctions between types of eye and mouth movements. These representations generalize across the actor performing the movement, and across small differences in visual position. Critically, patterns of response to combined movements could be well predicted by linear combinations of responses to individual eye and mouth movements, pointing to a parts‐based representation of complex face movements. These results indicate that the fSTS plays an intermediate role in the process of inferring social content from visually perceived face movements, containing a representation that is sufficiently abstract to generalize across low‐level visual details, but still tied to the kinematics of face part movements.  相似文献   
7.
8.
This study deals with a series of operations to isolate the micro-cellulose from the palm tree spathe sheath by using a modified chemical method to take into account the low cost and the completion speed and its characterization using X-ray diffraction technique (XRD), infrared spectroscopy (FTIR) and scanning electron microscope coupled with element analyzer (SEM/EDX). The results showed that the extraction method succeeded in obtaining very pure microscopic fibers with a width of 2–10 μm with a crystallinity index equal to 79.21%, containing the two cellulose features Iβ and II, that, the conversion ratio of the first to the second was estimated at 32, 87%.  相似文献   
9.
10.

Objectives

The current study investigated the effects of two exercise interventions on cognitive function amongst breast cancer survivors.

Design

Pilot randomised-controlled trial.

Methods

Seventeen female cancer survivors (mean: 62.9 ± 7.8 years) were randomised into three groups: high-intensity interval training (HIIT, n = 6); moderate-intensity continuous training (MOD, n = 5); or wait-list control (CON, n = 6). The HIIT and MOD groups exercised on a cycle ergometer 3 days/week for 12-weeks. Primary outcomes were cognitive function assessments utilising CogState. Secondary outcomes were resting middle cerebral artery blood flow velocity, cerebrovascular reactivity and aerobic fitness (VO2peak). Data were analysed with General Linear Mixed Models and Cohen’s d effect sizes were calculated.

Results

All 17 participants who were randomised were available for follow-up analysis and adherence was similar for HIIT and MOD (78.7 ± 13.2% vs 79.4 ± 12.0%; p = 0.93). Although there were no significant differences in the cognitive and cerebrovascular outcomes, HIIT produced moderate to large positive effects in comparison to MOD and CON for outcomes including episodic memory, working memory, executive function, cerebral blood flow and cerebrovascular reactivity. HIIT significantly increased VO2peak by 19.3% (d = 1.28) and MOD had a non-significant 5.6% (d = 0.72) increase, compared to CON which had a 2.6% decrease.

Conclusions

This study provides preliminary evidence that HIIT may be an effective exercise intervention to improve cognitive performance, cerebrovascular function and aerobic fitness in breast cancer survivors. Considering the sample size is small, these results should be confirmed through larger clinical trials.  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