Comparison of quasicrystalline (T2) and crystalline (R) structures in AlCuLi using high-resolution X-ray diffraction

Abstract

A high-resolution X-ray scattering experiment has been performed on quasicrystalline (T2) and crystalline (R) phases of AlCuLi alloys. Peak widths determined from the diffraction profile of the R phase are found to scale with momentum transfer G, similar to the strain-broadening effect seen in conventional crystals with small unit cells. A narrowing of peak widths on annealing is also observed. On the other hand, diffraction peak widths in I-phase samples obtained by rapid solidification are found to scale with phason momentum G ₁, similar to that observed in large faceted crystals. Thermal annealing of the I phase is found to have no effect on peak widths. Our findings are discussed in the light of models for crystals and quasicrystals.     

伍连德与早期中俄陆路口岸出入境动物检疫

从档案资料中发现,伍连德在东三省防疫总处工作期间,对我国出入境动物检疫的发展起到了积极的促进作用.在他的大力推动下,黑河道立兽疫检验所和满洲里、海拉尔獭皮消毒检验所得以建立,使得黑龙江省成立了第一个由中国政府掌管的出入境动物检验机构,并且将旱獭的捕猎和贸易引入了科学规范的监管道路.通过对一手资料的挖掘和梳理,论述了伍连德先生在中国出入境动物检疫机构和制度的建立以及人才引进方面所做出的努力,进一步拓展和丰富了对伍连德先生的研究成果.     

Event-related brain potentials: report order and task switch on multidimensional stimuli identification

An experiment was conducted to evaluate the effect of order of reporting stimulus dimension in multidimensional stimulus identification using a switch-task paradigm. Participants were required to identify each two-dimensional symbol by pushing the corresponding buttons on the keypad on which there were two columns representing the two dimensions, part and shape. The two orders of report were Order Part/Shape and Order Shape/Part. There was a task cue prior to each presentation of a symbol indicating the particular report order the participants should perform. The cue changed randomly. Both behavioral data and event-related potentials were recorded from 12 college students. Analysis of behavioral data showed switch cost indicated by increase in response time was greater for Order Shape/Part, a less appropriate order of reporting dimensional values, than Order Part/Shape (88 msec. vs 9 msec. for response time for the first stimulus dimension; 96 msec. vs -1 msec. for response time total). Neural activities under Order Shape/Part and Order Part/Shape were different, and it seems plausible that participants put more effort into selection and showed more related semantic activation in Order Shape/Part than in Order Part/ Shape which fits the Chinese adjective-then-noun language habit.     

Hemispheric competition in left-handers on bimanual reaction time tasks

The authors examined possible differences in left- and right-handers on bimanual reaction times to centralized visual stimuli. Eighty participants (n = 40 in each group of left- and right-handers) were tested on unimanual and bimanual reaction time (RT) tasks. Consistently across the 2 groups, the dominant-hand RT was faster, on average, than the nondominant-hand RT, and unimanual RTs were faster than bimanual RTs. However, RT differences between hands revealed a higher percentage of dominant-hand-led trials in right-handers than in left-handers, despite similar absolute RT differences in the 2 groups. On the basis of those findings, the authors conclude that hand dominance does not generally determine which hand leads in a bimanual task and that left-handers have stronger between-hemisphere competition than right-handers do.     

A structural model of acculturation and mental health status among Chinese Americans

This study examined the role of acculturation and its direct and indirect impact on depressive symptom severity through various correlates, including socioeconomic status (SES), stress, social support, personality negativity, and physical health perception. Using structural equation modeling, the proposed model was tested with 983 employed Chinese Americans from a representative community sample, the majority of whom were immigrants. The results demonstrated that acculturation, correlated with SES, contributed to depressive symptom severity only through indirect pathways. Higher acculturation was found associated with higher stress that in turn contributed to more elevated depressive symptoms. On the other hand, higher acculturation was also found strongly correlated with higher SES, which was associated with lower depressive symptoms directly or indirectly through several mediators. Better support, lower personality negativity, better health perception, and lower stress were found mediating the relationship between higher SES and lower depressive symptom severity. The simultaneous multigroup analysis showed that the final model was comparable for both men and women with very few differences.     

Investigating the visual span in comparative search: the effects of task difficulty and divided attention

In three experiments, participants' visual span was measured in a comparative visual search task in which they had to detect a local match or mismatch between two displays presented side by side. Experiment 1 manipulated the difficulty of the comparative visual search task by contrasting a mismatch detection task with a substantially more difficult match detection task. In Experiment 2, participants were tested in a single-task condition involving only the visual task and a dual-task condition in which they concurrently performed an auditory task. Finally, in Experiment 3, participants performed two dual-task conditions, which differed in the difficulty of the concurrent auditory task. Both the comparative search task difficulty (Experiment 1) and the divided attention manipulation (Experiments 2 and 3) produced strong effects on visual span size.     

Jungian Analysis of the Chinese Mythological Image of Sun Wukong

This paper examines the symbolism of the cultural image Sun Wukong (the Monkey King), a Chinese legendary hero, and how it influenced an eight-year-old boy’s psychic development. Through an analysis of Sun Wukong’s life from his birth to attaining Buddhahood, a three-phase healing process is identified in Sun Wukong’s tale and the psychotherapeutic process: “naming and initiating,” “nurturing and taming,” and “transforming and transcending,” proposed by Dr. Heyong Shen. Sandplay visually highlighted these key clinical changes in conscious awareness and developmental behaviour influencing the boy’s individuation process. Images found either in cultural traditions or spontaneously emerging from the unconscious in individuals are of significance in human life, offering pathways to psychic healing and development. Further, myths and cultural resources used in clinical work demonstrate that having cultural competency is invaluable in Jungian analysis. Pathogenic and health-maintenance factors of culture can be explored in future clinical practice and research.     

儿童运动行距预测能力的发展及影响因素

采用计算机软件控制实验,以三种不同运动速度、四种不同运动行距组合呈现的光点运动为刺激物,每次光点在暴露运动一段行程后进入遮蔽,要求儿童判断光点到达目标位置时按键反应。主要结果表明：（１）儿童运动行距预测能力的发展表现为５─８岁和１２─１９岁两个加速期及８─１２岁一个过渡期的发展模式。但在过渡期内,儿童的预测误差偏向有显著变化;（２）客体运动速度对儿童运动行距预测操作精度有显著影响,慢速下精度较高;（３）客体运动行距、被试性别并不影响儿童的行距预测操作;（４）５岁、１２岁与１９岁儿童多倾向于超前反应。     

抑郁者操作任务中目标设立与自我评价的特点

参加研究的被试包括：抑郁性神经症组（２０人）,抑郁症组（１３人）,正常对照组（２９人）。所有被试在完成独粒钻石棋作业的前后对其作业目标进行了估计,并在作业后对操作的满意程度进行了评价,对影响操作者的因素进行了归因,研究所得到的主要结果为（１）抑郁者在操作任务前的目标设立与正常人或抑郁者相似。（２）实际作业成绩与效能感得分相关,（３）抑郁症,抑郁性神经症相被试消极的自我归因倾向明显高于正常组。     

FOK判断等级及其准确性的实验研究

通过实验集中控制了ＦＯＲ判断等级及其准确性的影响因素。实验以中文字串为学习材料,使用组内设计的实验方法研究了被激活信息的量和强度对ＦＯＤ等级及准确性的影响。实验结果表明：ＦＯＫ判断的等级是由被激活信息的总量决定;的,和被激活信息的正确与否无关;ＦＯＤ判断的准确性是由被激活信息的强度决定的;且二者是在内联系的。