全文获取类型
收费全文 | 781篇 |
免费 | 86篇 |
国内免费 | 197篇 |
出版年
2024年 | 1篇 |
2023年 | 13篇 |
2022年 | 23篇 |
2021年 | 32篇 |
2020年 | 34篇 |
2019年 | 21篇 |
2018年 | 32篇 |
2017年 | 38篇 |
2016年 | 38篇 |
2015年 | 28篇 |
2014年 | 34篇 |
2013年 | 72篇 |
2012年 | 50篇 |
2011年 | 62篇 |
2010年 | 55篇 |
2009年 | 44篇 |
2008年 | 57篇 |
2007年 | 66篇 |
2006年 | 85篇 |
2005年 | 72篇 |
2004年 | 53篇 |
2003年 | 43篇 |
2002年 | 21篇 |
2001年 | 14篇 |
2000年 | 17篇 |
1999年 | 9篇 |
1998年 | 8篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1982年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有1064条查询结果,搜索用时 15 毫秒
41.
It is known that electromyostimulation (EMS) alone or superimposed over voluntary contraction (EV) can effectively improve muscle strength. However, the effect of this type of training on the ability to control force production at submaximal levels is unknown. The authors examined the effects of EV training on steadiness in force production of knee extensors and flexors in older adults. Forty participants, including 20 men and 20 women, 60-77 years of age, were randomly allocated into a control group (CG) and an electromyostimulation superimposed over voluntary contraction (EVG) group. The EVG performed 30 bilateral isometric knee extension and flexion contractions per session, 3 training sessions per week, for 6 weeks. The variations in force production, expressed in absolute (standard deviation [SD]) and relative (coefficient of variation [CV]) terms, were assessed in isometric contractions at 5%, 15% and 25% maximal voluntary contraction (MVC) levels. Results indicated that MVC increased in knee extension and flexion in EVG (p < .05) after the training; steadiness CV also improved at 15% MVC in knee flexion (p < .05) but no significant changes were found in knee extension and steadiness SD. The training-induced changes in MVC were not correlated to steadiness CV that might indicate different mechanisms underlying these adaptations. 相似文献
42.
43.
The objective of this study investigated cognitive impairments and their correlations with fractional anisotropy (FA) and mean diffusivity (MD) in patients with neuromyelitis optica (NMO) without visible lesions on conventional brain MRI during acute relapse. Twenty one patients with NMO and 21 normal control subjects received several cognitive tests to assess cognitive function. Head diffusion tensor imaging (DTI) of all patients with NMO were collected with a 3-T MR system. Correlations of cognitive test scores and whole brain FA and MD were examined by voxel-based analysis. Region-of-interest analysis was applied to the significantly correlated regions which the most frequently appeared. We found that NMO patients without visible brain lesions had significantly impaired learning and memory, decreased information processing speed, and damaged attention compared with normal control subjects. These impaired cognitive domains were significantly correlated with FA and MD in local regions of corpus callosum, anterior cingulate and medial frontal cortex. In corpus callosum of NMO patients, mean FA was significantly lower and mean MD higher than normal control subjects. Our findings suggest that cognitive impairments in learning and memory, information processing speed and attention occur in NMO patients without visible brain lesions during acute relapse. The impairments in immediate and short-term memory in NMO patients may be due to information encoding deficits in the process of information acquisition. The corpus callosum of such patients may have local microscopic damages that play a role in cognitive impairments during acute relapse. 相似文献
44.
This study investigated the effect of isoflavone aglycone (IA) on the learning and memory performance of senescence-accelerated mice, and explored its neural protective mechanism. Results showed that SAM-P/8 senescence-accelerated mice treated with IA performed significantly better in the Y-maze cognitive test than the no treatment control (P<0.05). The cortex AchE activity, serum SOD and GSH-Px activities were notably higher (P<0.05). MDA concentration and the β-secretase activity in the hippocampal tissue were both lower (P<0.05). Additionally, the number of hippocampal neurons was increased and cell morphology was significantly improved. Data suggested that IA could indirectly increase concentration of the cholinergic neural transmitter Ach through regulation of AchE, therefore improving the central cholinergic function and enhancing the learning and memory ability. By reducing the β-secretase activity, IA could decrease the formation and deposition of insoluble Adebris, relieve the resulted toxicity and damage to neurons, and thereby effectively protect the nervous system. 相似文献
45.
To explore the relationship between parental phubbing (PP) and adolescent online hostility and its' psychological mechanism, 689 Chinese adolescents were recruited to complete a paper-and-pencil questionnaire. We took cyber flaming (CF) as an overall category for hostile online communication to investigate the relationship between PP and CF and the mediating role of perspective-taking (PT) in this relationship and examined whether there is a sex difference in this process. After controlling the average daily online time, the results showed that PP predicted adolescent CF positively. The relationship between PP and CF was partially mediated by PT. The effect of PP on PT was moderated by sex, with the result being significant only for boys. Related findings and future directions were discussed. 相似文献
46.
研究采用运动橡胶手错觉范式,操纵了“控制”和“社会效价”两个变量,通过行为实验探讨了控制和社会效价对身体拥有感的影响。结果发现,与“被动控制”条件相比,“主动控制”条件产生了更强的拥有感; 与“不利”条件相比,“有利”条件产生了更强的拥有感。且“控制”和“社会效价”的交互作用显著:无论哪种控制条件,有利条件下的拥有感都显著高于不利条件下的拥有感; 无论哪种效价条件,主动控制条件下的拥有感均显著高于被动控制条件下的拥有感。该结果表明,控制和社会效价是产生身体拥有感的条件。研究结果为提高假肢佩戴者对假肢的心理接纳程度提供了有益的训练途径。 相似文献
47.
先前研究发现远距离规则能够被内隐地习得和迁移,表明内隐学习获得的知识是底层的抽象规则,那么这一抽象规则的习得和迁移是否会受到先前知识经验的限制?研究采用汉语声调的远距离水平映射规则为材料,通过创设不符合平仄知识经验的任意声调水平映射规则,在控制组块和重复结构等表面特征的条件下,探讨先前知识经验是否限制了远距离水平映射规则的内隐学习和迁移。结果发现相对于符合平仄知识经验的汉语声调水平映射规则,被试不能够内隐地习得和迁移任意声调的水平映射规则,表明先前知识经验在远距离水平映射规则内隐学习过程中发挥着重要作用。 相似文献
48.
Li Fugui Mu Weiqi Li Siying Li Xue Zhang Jianxin Chen Chen Zhou MingJie 《Applied research in quality of life》2022,17(4):2041-2058
Applied Research in Quality of Life - Is the Easterlin paradox lost, or has it been regained? Scholars have started to debate this topic in recent years. This paper explores the association between... 相似文献
49.
Correction to: Trends of Positive Youth Development Publications (1995–2020): A Scientometric Review
Qi Shaojie Hua Fengrui Zhou Zheng Shek Daniel T. L. 《Applied research in quality of life》2022,17(1):447-448
Applied Research in Quality of Life - A Correction to this paper has been published: https://doi.org/10.1007/s11482-020-09905-3 相似文献
50.