Nanocrystallization effect on the surface electron work function of copper and its corrosion behaviour

The effect of grain size at micro- and nanoscale on the surface electron stability of copper as reflected by the electron work function (EWF) was investigated. In the ambient environment, the surface reactivity increases with decreasing grain size in the micron range, but decreases when entering the nanometre range. When in a solution with associated passivation, grain refinement enhances resistance to corrosion. However, the situation is reversed when no passivation is involved. In the former case, the improved surface stability and corrosion behaviour caused by nanocrystallization can be attributed to the formation of a more protective passive film. In the latter case, nanocrystallization accelerates material dissolution resulting from enhanced activity of surface electrons at high-density grain boundaries. The correlation between EWF and the corrosion behaviour, as well as the mechanisms involved, are discussed.     

Group Cohesion,Achievement Motivation,and Motivational Outcomes among Female College Students

Embedded in the theory of group cohesion and the expectancy-value model of achievement choice, the purpose of this study was to examine the predictive strengths of group cohesion on students’ motivation (expectancy-related beliefs and subjective task values) and motivational outcomes (exercise choice and class attendance) in college physical activity classes. Participants were 121 females enrolled in aerobics classes who completed questionnaires assessing group cohesion, motivational constructs, and exercise choice. Group cohesion constructs were significantly associated with motivation and motivational outcomes. These findings provide insight into how to design environments to promote motivation in physical activity classes.     

卡片数量和卡片比率对经典四卡问题解决的影响

两个实验分别操纵四卡问题中四类卡片(P、-P、Q、-Q)的数量或Q卡与-Q卡之间的比率,以探讨四类卡片的数量关系对经典四卡问题解决的影响,从而间接推断被试解决经典四卡问题时所采用的策略。实验一等比率地增加P卡、-P卡、Q卡、-Q卡的数量,结果发现,等比率地增加P卡、-P卡、Q卡、-Q卡的数量,使得P卡和Q卡被选择的比率减小,而-P卡和-Q卡被选择的比率不存在显著变化。实验二按不同比率操纵Q卡和-Q卡的数量,结果发现,当Q卡和-Q卡出现的比率不同时,Q卡数目越多,Q卡被选择的平均比率越小,但没有影响到P、-P卡和-Q卡被选择的比率。这些结果表明被试解决经典四卡问题时采用了"匹配偏向"策略。     

焦虑中的安全行为及其影响

安全行为是个体用于预防或者减轻恐惧后果的行为, 它被认为是焦虑障碍维持的重要机制之一, 也会对焦虑的暴露治疗产生干扰。安全行为与焦虑水平、焦虑相关的认知偏差存在联系, 错误归因假说、注意资源偏离假说和行为信息假说对这种联系做出了解释。此外, 安全行为的使用会削弱焦虑暴露治疗的效果、提高暴露的接受性。未来研究应对安全行为做出更清晰的界定和准确的测量, 进一步改进研究设计, 借鉴第三代行为治疗的理论解释安全行为与焦虑的关系; 同时还需要考察安全行为的双重作用, 开发聚焦于安全行为的治疗方案并评估其效果。     

Normative data on a battery of neuropsychological tests in the Han Chinese population

In order to develop normative data of a battery of neuropsychological tests in the mainland Chinese population, we examined the performance of 15 neuropsychological tests in 465 healthy subjects (231 males and 234 females) in a population‐based cohort study. The years of education were ranged between 1 and 23 years, and ages were ranged between 16 and 75 years old. The 15 neuropsychological tests cover five domains of neurocognitive functions including attention and speed of information processing, memory and learning, verbal function, visual constructive abilities, and executive function. We also assessed the effects of gender, age, educational attainment on the performance of these neuropsychological tests. The results showed that, as expected, educational attainment and age are the two main factors affecting performance in these tests. Educational attainment has the strongest predictive effect on all tests, while the majority of tests selected in this study are also affected by age at examination to varying degrees. The presented normative data will be useful for future studies in related clinical research, and be of value in transcultural neuropsychological studies.     

Reading performance in middle-aged adults with declines in accommodation

The present study investigated the effects of presbyopia on the reading ability of middle-aged adults in a Japanese reading context, using the rapid serial visual presentation paradigm. Japanese words, each consisting of three characters, were sequentially presented at the same location on a display screen. Participants were instructed to read the words aloud as accurately as possible, irrespective of their order within the sequence. Experiment 1 showed that the reading performance for the presbyopes was far worse for the near-viewing (35?cm) than for the far-viewing (70?cm) conditions when the words were presented at 0.4° in character size. Experiment 2 investigated in detail the effect of luminance contrast on reading at a viewing distance of 35?cm. The minimums of the exposure durations within which the participants could read the words above 89.9?% correct (minimum exposure duration) were 498?ms/word for the presbyopes and 134?ms/word for the nonpresbyopes, both of which values were obtained at 100?% contrast. The critical contrast??that is, the contrast that doubled the minimum exposure duration that had been obtained at 100?% contrast??was considerably higher for the presbyopes (39.2?%) than for the nonpresbyopes (16.4?%). However, the reading performance for the presbyopes was improved more than threefold when the contrast was increased to 100?% in both experiments. Thus, our results provide psychophysical evidence for the dependency of presbyopes?? reading on viewing distance and luminance contrast.     

Influence of personality traits on parasocial relationship with sports celebrities: A hierarchical approach

Using the 3M Model of Motivation and Personality as a theoretical framework, this study develops a three‐level hierarchy of personality traits predictive of fans' parasocial relationship with sports celebrities. Specifically, the findings show that parasocial relationship with sports celebrities is determined positively by materialism (the elemental trait), negatively by self‐esteem (the compound trait) and positively by interest in sports spectatorship (the situational trait). Practical and academic implications are provided. Copyright © 2012 John Wiley & Sons, Ltd.     

高一学生的错题管理行为

在三次团体焦点访谈基础上自编高中生错题管理行为调查问卷,对内蒙古某中学110位高一学生被试的错题管理行为进行了调查。结果表明:(1)高一学生被试普遍认识到了错题对于学习的影响,从情感上不回避错题,但对错题的价值认识不足,尤其缺乏良好的错题管理的意识与系统的错题管理策略;(2)学优生在错题管理观念与态度上显著优于普通生;(3)学优生与普通生在错题管理行为与策略上不存在显著差异。在某些管理行为上,前者显著优于后者;在个别管理策略的使用上,后者却显著优于前者。     

北京都城隍庙考

北京都城隍庙始建于元,迄今730余年.随着时局的变迁,如今的都城隍庙只有后殿"寝祠"幸存,旧日恢弘的建筑、庄严的祭礼,以及商贾云集的庙市早已淡出了人们的记忆.本文试图对都城隍庙从多个角度进行考证梳理,力求建立起一个对都城隍庙进行整体认知的构架.