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201.
利用停止信号任务考察了202名一至六年级小学生抑制能力的发展趋势。被试完成一个视觉上的图形判断任务,在25%的试次中,呈现一个声音信号要求被试抑制反应。以无停止信号下的反应时来衡量反应执行能力,用停止信号反应时(SSRT)来衡量反应抑制能力。结果发现,反应抑制能力随着年龄增长而提高,具体表现为五六年级儿童的抑制能力优于三四年级和一二年级学生的抑制能力。对于反应执行能力,三四年级与一二年级没有差异,而五六年级的成绩显著优于其他年级。结果表明,五六年级儿童的反应执行能力和反应抑制能力都有显著发展。 相似文献
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Fracture behavior of Cu–Ni laminate composites has been investigated by tensile testing. It was found that as the individual layer thickness decreases from 100 to 20 nm, the resultant fracture angle of the Cu–Ni laminate changes from 72° to 50°. Cross-sectional observations reveal that the fracture of the Ni layers transforms from opening to shear mode as the layer thickness decreases while that of the Cu layers keeps shear mode. Competition mechanisms were proposed to understand the variation in fracture mode of the metallic laminate composites associated with length scale. 相似文献
204.
Baolong Zheng Ying Li Weizong Xu Yizhang Zhou Suveen N. Mathaudhu Yuntian Zhu 《Philosophical Magazine Letters》2013,93(8):457-464
Nanocrystalline (nc) Mg powder was synthesized via cryomilling. Extension twins were identified with high-resolution transmission electron microscopy in the cryomilled powders and the study presents the first evidence of twinning in unalloyed nc Mg. The formation of twins in the nc Mg is attributed to a high strain rate, the low (cryogenic) temperature and high local shear stresses present around the grain boundaries during deformation by cryomilling. 相似文献
205.
刘筑 《医学与哲学(人文社会医学版)》2013,34(4):86-88
受条件、环境等因素影响,基层医院的骨科医生成长艰难,然而他们却承担了大量的医疗任务,他们所承受的工作压力非常大,这个问题应当引起社会各界的广泛关注,因为基层医院骨科医生的专业技能与广大人民群众的生命安全和身体健康息息相关. 相似文献
206.
旨在探讨基于持续幸福理论的感恩、助人和追求目标的主观幸福感干预方法在国内工作场所中的有效性。采用随机分组安慰剂控制的方式,将3家企业的140名员工随机分为3个干预组、1个安慰剂控制组和1个空白对照组,进行持续一周的干预,并分别在干预前、干预结束时和干预结束2周后对被试的主观幸福感进行测试。结果发现记录感恩能够显著提升生活满意度;助人行为能够显著提升生活满意度、积极情绪,且能降低消极情绪;追求目标能显著提升生活满意度和降低消极情绪。结果表明上述三种干预方法能有效提高工作场所人员的主观幸福感。 相似文献
207.
Machery Edouard Stich Stephen Rose David Alai Mario Angelucci Adriano Berniūnas Renatas Buchtel Emma E. Chatterjee Amita Cheon Hyundeuk Cho In-Rae Cohnitz Daniel Cova Florian Dranseika Vilius Lagos Ángeles Eraña Ghadakpour Laleh Grinberg Maurice Hannikainen Ivar Hashimoto Takaaki Horowitz Amir Hristova Evgeniya Jraissati Yasmina Kadreva Veselina Karasawa Kaori Kim Hackjin Kim Yeonjeong Lee Minwoo Mauro Carlos Mizumoto Masaharu Moruzzi Sebastiano Olivola Christopher Y. Ornelas Jorge Osimani Barbara Romero Carlos Lopez Alejandro Rosas Sangoi Massimo Sereni Andrea Songhorian Sarah Sousa Paulo Struchiner Noel Tripodi Vera Usui Naoki del Mercado Alejandro Vázquez Volpe Giorgio Vosgerichian Hrag Abraham Zhang Xueyi Zhu Jing 《印度哲学研究理事会杂志》2017,34(3):517-541
Journal of Indian Council of Philosophical Research - This article examines whether people share the Gettier intuition (viz. that someone who has a true justified belief that p may nonetheless fail... 相似文献
208.
Various definitions and different approaches for assessing the complex construct of parental involvement (PI) have led to inconsistent findings regarding the impact of PI on child development. To date, limited information is available regarding the measurement invariance of PI measures across time and groups (e.g., children’s gender, ethnicity, and socio-economic status), leaving a concern that group differences in PI might reflect item bias instead of true differences in PI. The present study aimed to obtain a set of optimal items for measuring PI from kindergarten through the elementary school years and investigate whether they could be used for parents from different groups. A Rasch measurement model was implemented to investigate item difficulty, step calibrations, and measurement invariance (differential item functioning; DIF, here). The results from the Early Childhood Longitudinal Study, Kindergarten Class of 1998–1999 data set showed that 20 items can be used to measure three dimensions of PI—namely school/home involvement, family educational investment, and family routines—across four time points. Administrative time, children’s gender, ethnicity, and social economic status showed different levels of effect on item difficulty for half of these items. Practitioners and researchers should be cautious when using these items and are suggested to freely estimate the item parameters of DIF items as well as add more items to the PI scale to improve reliability. 相似文献
209.
210.
Three experiments with 88 college-aged participants explored how unlabeled experiences—learning episodes in which people encounter objects without information about their category membership—influence beliefs about category structure. Participants performed a simple one-dimensional categorization task in a brief supervised learning phase, then made a large number of unsupervised categorization decisions about new items. In all three experiments, the unsupervised experience altered participants’ implicit and explicit mental category boundaries, their explicit beliefs about the most representative members of each category, and even their memory for the items encountered during the supervised learning phase. These changes were influenced by both the range and frequency distribution of the unlabeled stimuli: mental category boundaries shifted toward the middle of the range and toward the trough of the bimodal distribution of unlabeled items, whereas beliefs about the most representative category members shifted toward the modes of the unlabeled distribution. One consequence of this shift in representations is a false-consensus effect (Experiment 3) where participants, despite receiving very disparate training experiences, show strong agreement in judgments about representativeness and boundary location following unsupervised category judgments. 相似文献