全文获取类型
收费全文 | 768篇 |
免费 | 85篇 |
国内免费 | 197篇 |
专业分类
1050篇 |
出版年
2024年 | 1篇 |
2023年 | 13篇 |
2022年 | 23篇 |
2021年 | 32篇 |
2020年 | 36篇 |
2019年 | 21篇 |
2018年 | 32篇 |
2017年 | 38篇 |
2016年 | 37篇 |
2015年 | 28篇 |
2014年 | 34篇 |
2013年 | 58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 | 71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1050条查询结果,搜索用时 0 毫秒
941.
If it goes up, must it come down? Chronic stress and the hypothalamic-pituitary-adrenocortical axis in humans 总被引:3,自引:0,他引:3
The notion that chronic stress fosters disease by activating the hypothalamic-pituitary-adrenocortical (HPA) axis is featured prominently in many theories. The research linking chronic stress and HPA function is contradictory, however, with some studies reporting increased activation, and others reporting the opposite. This meta-analysis showed that much of the variability is attributable to stressor and person features. Timing is an especially critical element, as hormonal activity is elevated at stressor onset but reduces as time passes. Stressors that threaten physical integrity, involve trauma, and are uncontrollable elicit a high, flat diurnal profile of cortisol secretion. Finally, HPA activity is shaped by a person's response to the situation; it increases with subjective distress but is lower in persons with posttraumatic stress disorder. 相似文献
942.
Chinese kindergartners’ automatic processing of numerical magnitude in Stroop-like tasks 总被引:2,自引:0,他引:2
Using Stroop-like tasks, this study examined whether Chinese kindergartners showed automatic processing of numerical magnitude. A total of 36 children (mean age 5 5 years 10 months) were asked to perform physical size comparison (i.e., “Which of two numbers is bigger in physical size?”) and numerical magnitude tasks (i.e., “Which of two numbers is bigger in numerical magnitude?”) on 216 number pairs. These number pairs varied in levels of congruence between numerical magnitude and physical size (for Stroop effect) and numerical distance (for distance effect). On the basis of analyses of response time and error rates, we found that Chinese kindergartners showed automatic processing of numerical magnitude. These results are significantly different from previous studies’ findings about the onset age (ranging from around the end of first grade to third grade) for automatic processing of numerical magnitude. 相似文献
943.
本文在研读大量原始资料的基础上,对卫理公会华西教区在成都办的《青年问题》月刊做了全面分析,内容包括该刊的创办历史、组织机构、内容特色与经营管理,并对其历史价值做了实事求是的评价。 相似文献
944.
Adult visual experience promotes recovery of primary visual cortex from long-term monocular deprivation 下载免费PDF全文
Prolonged visual deprivation from early childhood to maturity is believed to cause permanent visual impairment. However, there have been case reports of substantial improvement of binocular vision in human adults following lifelong visual impairment or deprivation. These observations, together with recent findings of adult ocular dominance plasticity in rodents, led us to re-examine whether adult primary visual cortex (V1) is capable of any recovery following long-term monocular deprivation starting in development. Using mice as a model, we find that monocular deprivation from early development to mature ages (well past the critical period) severely impaired binocular vision by reducing the amplitude of responses elicited by stimulation of the deprived eye. Surprisingly, we find little effect on nondeprived eye responses. Restoration of binocular vision in mature adults yields modest but significant improvement of visual responses in V1. Remarkably, we find that when binocular vision is followed by occlusion of the nondeprived eye, visual responses in V1 recover almost fully, as measured by visual evoked potential amplitude, spatial frequency threshold, and single-unit activity. We conclude that adult V1 can recover from long-term deprivation when provided with an optimal regimen of visual experience. 相似文献
945.
946.
本研究运用结构性观察方法对两组4岁儿童与父母在四种活动中的互动进行了分析与比较。一组儿童为书面数符号测查高分者,二组儿童为书面数符号测查低分者。85对父母一儿童对子参加了4个各有15分钟的共同活动,阅读、数学题、纸和积木,并完成一个微型问卷。结果表明,在这些活动中包含了多种数学知识学习和多种以父母为主导的互动策略;两组对子之间在数学事件频次上无差异,但一组父母更多地运用了一些积极策略,二组父母更多地运用了一些消极策略;二组中有更多儿童对互动表现出消极回应和注意力问题。两个组的父母在家中与儿童一起进行诸如阅读和做数学题的共同活动的频次与质量上表现出差异。 相似文献
947.
948.
网络使用线索对不同动机使用者上网欲望的诱发作用 总被引:2,自引:0,他引:2
以67名信息获取性动机者和54名人际情感性动机者为被试,以基于实景照片的网络信息获取线索、网络情感满足线索和负性情绪线索为刺激材料,采用线索暴露范式探讨了网络使用线索对网络使用者上网欲望的相对影响。实验结果表明,网络信息获取线索仅对信息获取性动机者的上网欲望具有显著的诱发作用,而情感满足线索和负性情绪线索仅对人际情感性动机者的上网欲望具有显著的诱发作用。该研究为解释人际情感性动机者的病理性互联网使用行为特征提供了实验证据。 相似文献
949.
A qualitative exploration of alcohol use among student sportspeople: A social identity perspective 下载免费PDF全文
Research indicates that university student sportspeople are a high‐risk subgroup for hazardous alcohol consumption. Adopting a social identity perspective, we explored the social and psychological processes linking sports participation and alcohol use. Twenty‐two individual semi‐structured interviews were conducted with UK student sportspeople (male: 12; female: 10). A deductive thematic analysis identified three core themes: social identification and sports group membership, identity processes in (alcohol) behaviours and sport context‐specific significance of alcohol. Results suggest that the consumptive practices among student sportspeople were strategic activities underpinned by social identity processes, and which served to provide a positive sports experience at the group level. Our findings highlight the interactions between the sport environment, the social structure of sport participation and the multipurpose function of alcohol in this context. We discuss the implications of these results in support of a social identity approach to sport‐related drinking. 相似文献
950.