Evidence for microcrystallites in icosahedral AlMnSi

Abstract

An analysis of extended X-ray absorption fine structure (EXAFS) measurements at the Mn K-edge of the α-crystalline and icosahedral (i) phases of MnAlSi indicates that the icosahedral cage of Mn atoms that is part of the common structural unit in both phases retains its cubic distortion in the i-phase. Neither a quasicrystalline nor a randomly connected icosahedron (icosahedral glass) model is in agreement with this experimental result. A model that is consistent with the new EXAFS results and other properties of the i-phase of MnAlSi is one in which ～40 Å crystallites of the α-phase are oriented icosahedrally along the threefold directions of the structural unit.     

Los efectos placebo en la psicología experimental y clínica

RESUMEN

Este trabajo comienza planteando que el término “placebo” se ha convertido en un cajón de sastre en el que los autores engloban diferentes, y a menudo opuestas y dispares, concepciones. Después de destacar la atención creciente a los efectos placebo en la psicología actual y la tendencia a la convergencia entre distintos enfoques en psicoterapia, la autora aborda las divergencias y dificultades para definir placebo aludiendo a concepciones de diferentes autores y centrándose en el planteamiento de Grünbaum (1985). Avia coincide con Brody (1985) en que el problema de nuestro desconocimiento sobre qué sea placebo afecta, recíprocamente, a nuestra falta de conocimiento sobre lo que debe considerarse terapia, ofreciendo algunas reflexiones en torno a posibles explicaciones de este fenómeno y destacando la débil frontera que separa éstas de las explicaciones sobre ciertas variables cognitivas. La autora concluye la presentación de este dossier afirmando que será a partir de la elaboración teórica y el trabajo de investigación como podremos profundizar en el conocimiento del fenómeno placebo.     

The relationship of the family social environment, peer influences, and peer relationships to altruistic orientation in Chinese children

This study investigated the correlation between the family social environment, peer influences, and peer relationships to altruistic orientation in Chinese children. Results in the present study showed that (a) altruistic orientation measured by the Child Altruism Inventory (H. K. Ma & M. C. Leung, 1991) was directly associated with a positive family social environment, (b) altruistic orientation was directly associated with positive peer influences and was inversely associated with negative peer influences, and (c) altruistic orientation was directly associated with perceived prosocial behavior of one's best friend and inversely associated with perceived antisocial behavior of one's best friend. The findings suggested that a good family social environment, positive peer influences, and good peer relationships tended to increase altruistic orientation.     

心理学的方法学探讨——心理的模糊性及模糊统计试验评注

本文以实验心理的某些试验模式为范例,初步评注了心理的模糊性及其处理手段—模糊集(合)的含义,同时,对心理的随机性作了相应的说明。其次,解说了模糊统计(或集值统计)的特点及某些实现的具体方法。最后,作了一个初步的比较试验。     

职业紧张与组织对策分析:LISREL建模

本研究以职业紧张的认知中介理论为出发点 ,分析了管理措施、个体控制感和职业紧张之间的相互关系 ,并在此基础上 ,运用 L isrel建模方法 ,提出了职业紧张的组织参与对策、目标设置对策和领导支持对策。     

管理者工作压力高阶因素结构分析

本研究通过对浙江省七家企业的中层管理者工作压力的调查 ,分析了管理者工作压力体验的因素构成 ,揭示了工作压力体验评价的三个维度 :心理、生理和情绪维度 ,并以此为基础确定了工作压力的评价量表。比较不同职能部门、不同知识水平的管理者的工作压力体验 ,发现工作压力体验与工作的生产介入程度有密切联系 ,生产介入程度越深 ,工作压力越大 ;另一方面 ,知识水平也影响着管理者的工作压力 ,学历较低 (如初中学历 )的管理者由于不能满足工作的技术发展要求 ,其工作压力体验显著高于学历较高的管理者。     

高原低氧对脑功能的影响

本文报告了海拔4,000米左右低氧对脑功能的影响,并观察了高原现场驾驶汽车劳动6小时后脑功能的变化。所用测试指标如下:视觉机能(颜色分辨、深度觉、视觉疲劳和视觉注意稳定性等测验);听觉机能(听阈测验、听觉疲劳、声音强度辨别阈和声源定向等测定);记忆联想和演算能力测定;反应时和手脚协同活动反应;驾驶追踪动作和汽车穿桩实验等多种综合指标。结果表明,一些指标有影响,另一些指标没有影响。总的看来,海拔4,000米左右的高原现场对人的感觉机能和脑功能没有明显的影响。     

学生团体主题统觉测验研究

对日本版团体主题统觉测验进行了研究,产生了中国版的团体主题统觉测验,被试分别自小学、初中、高中、大学人２７９２名,在此基础上产生了各学龄阶段的常模,研究表明,该测验的信度和效度都比较高,可以在我国各类学校推广使用。     

中国人眼光谱相对视亮度函数的研究

问 题 人眼对光谱各波长的灵敏度,是产生一种阈限反应或主观相等亮度所需要的辐射能量的倒数。它们原称光谱视亮度,现在我们称之为光谱相对视亮度。即使是等能光谱,各波长引起的相对视亮度也很不相同。具体测量时除绝对阈限法外,一般常用匹配法:使人眼将不同波长的光谱色光分别和一个固定强度的白色标准光作亮度匹配,达     

Formal vs. Informal Use of Television and Sex-Role Stereotyping in Hong Kong

This study examines the relationship between media use and gender stereotyping in Hong Kong, where Western liberal thoughts meet Chinese traditional and patriarchal norms. Although mainstream media studies center on the general impact of television on sex-role stereotyping, this study distinguishes the formal use of television for information from the informal use for entertainment, the latter of which is often neglected, but the impact is far more encompassing. A baseline survey on gender equality commissioned by the Hong Kong Government with 2,020 successful face-to-face interviews was conducted and the sample was of the Equal Probability of Selection Method (EPSEM) type provided by the Census and Statistics Department. The participants are all Chinese from all class strata (51.5% below HK$10,000; 39.4% between HK$10,000 and HK$24,999; and 19.1% above HK$25,000 with US$1 HK$7.8). The BSRI measurement was modified to gauge the gender-role stereotype. The results show that despite influence by Western culture, gender stereotyping of the public in Hong Kong still exists. In particular, the self-reported functional television for entertainment (rather than for information) as well as exposure to entertainment programs on television have reinforced the female stereotypes, and females have a lower cultural awareness toward male stereotypes.