Study on the deformation of nanocrystalline cobalt

A study was carried out on the deformation of nanocrystalline cobalt. For cold-rolled nanocrystalline cobalt, the X-ray diffraction peaks narrowed instead of broadened on deformation. The results of transmission electron microscopy showed that grain size (17.8?nm on average) was not increased. The results can be explained in terms of the production and activity of vacancies and vacancy clusters.     

Interfacial structure in SiC/Si3N4 composite whiskers

Abstract

High-resolution TEM techniques have been used to investigate the interfacial structure in SiC/Si₃N₄ composite whiskers grown by a vapour–liquid–solid process. On one side of the whisker a coherent interface with the relationship of (111)β-SiC∥(102) α-Si₃N₄ has been observed, on the other side the interface is (111)β-SiC∥(114)α-Si₃N₄.     

Low-temperature mechanical properties of Ce68Al10Cu20Co2 bulk metallic glass

Although it is well known that traditional metals and alloys will become brittle at low temperatures, the effect of low temperature on the mechanical properties of bulk metallic glasses (BMGs) is yet to be fully understood. In this research, the mechanical properties of Ce₆₈Al₁₀Cu₂₀Co₂ BMG are investigated at low temperatures. It is found that the yield strength of the Ce-based BMG increases significantly with the decrease of temperature. The elastic moduli of the BMG also increase monotonically with the drop of temperature, indicating the continuous stiffening of the BMG, while both Poisson's ratio and global plasticity decline at low temperatures. It is considered that the stiffer atomic bonds of the Ce-based BMG at low temperatures result in the increase of strength, and the higher energy required for nucleation of shear bands also leads to the increase in yield strength.     

工作记忆内容对无意视盲的改善作用

无意视盲是注意捕获失败的一种现象.研究发现:工作记忆内容对视觉注意的引导可以影响视觉注意的捕获.本研究以此为基础探讨了工作记忆内容能否影响无意视盲.本研究采用了静态无意视盲典型范式,通过两个实验分别探讨了工作记忆对无意视盲的引导作用以及在不同知觉负荷下引导作用的自动性,进而研究工作记忆内容对无意视盲的改善作用.实验1结果表明,当非期望刺激与工作记忆内容属于同一类别时,对非期望刺激的觉察率显著高于当非期望刺激与工作记忆内容不属于同一类别的情况,说明在纯语义的水平上工作记忆内容可以引导视觉注意捕获,进而改善无意视盲.实验2发现,当知觉负荷由低到高变化时,非期望刺激与工作记忆内容同类属时,觉察率无显著变化,说明工作记忆内容对无意视盲引导不受知觉负荷的调节,是一种自动化的过程.     

感染后咳嗽患儿血微量元素分析与黄芪注射液联合甘草合剂治疗研究

分析儿童感染后咳嗽的临床特点以及与外周血微量元素的关系,观察黄芪注射液联合甘草合剂治疗儿童感染后咳嗽的疗效。对自2006年1月至2008年6月在德州市妇幼保健院儿科门诊治疗的75例感染后咳嗽患儿行外周血微量元素测定,与40例健康小儿微量元素对比,并将75例患儿随机分为两个治疗组进行临床观察：实验组39例,口服黄芪注射液...     

个人自立对注意偏向影响的眼动研究

通过使用基于眼动的罗夏墨迹测验图观察任务与新异/自我观点观察任务来探究个人自立对注意偏向的影响。结果发现:(1)除了第四张图片以外,个人自立高分组在观察其他9张罗夏墨迹测验图时的眨眼率都显著或边缘显著的高于低分组;(2)个人自立高分组在观察两张新异/自我语句图片时进行新异/自我观点回视的次数都要显著多于低分组;(3)在观察第1张新异/自我语句图时,个人自立低分组对自我观点的注意明显多于新异观点。     

英国视角下的对印“仁慈专制”统治——一个经典问题的再思考

马克思关于英国在印度的殖民统治客观上具有"二重性"的论断是一个经典命题.英国对印度实行的"仁慈专制"统治,本身就是建立在"二重性"理论上的,19世纪末20世纪初达到顶峰,之后推行的改革措施也必须遵行专制和仁慈并行的路径.这种二重性本质上是英国自由主义自身的悖论,也是东方主义话语体系下以印度为"他者"建构英国民族性的方法之一,所以其客观效果也就不难理解了.     

Rural-urban differences in generation of Chinese and Western exemplary persons: The case of China

Chinese adolescents in urban cities (Beijing, Chengdu) and rural towns (Wei Shan Zhuang, Zheng Xing) generated Chinese and Western exemplary persons and rated the values these exemplary persons represent. The results showed that the tendency to differentiate Chinese culture from Western culture was greater among urban ( vs rural) Chinese. Specifically, only urban Chinese consistently attributed Chinese moral values (more than other types of values) to self-generated Chinese exemplary persons and Western moral values (more than other types of values) to self-generated Western exemplary persons. Because urban Chinese have more frequent exposure to foreign cultures, our results suggest that frequent exposure to foreign cultures can lead to enhanced perceptions of cultural differences.     

流畅感理论综述及其运用——由网游引发的若干思考

流畅感,也有人译作沉浸,指的是一种暂时性、主观的经验,当人们在进行活动的时候如果完全的投入情境中,就是进入一种沉浸的状态。在网络游戏中也有可能产生这样的状态,而这也是许多人会对网络游戏不可自拔的着迷的原因。我们以网络游戏中体验到的流畅感为例,探讨如何将这种体验迁移到教学或者工作当中,实现流畅感理论的应用。     

Maximum Likelihood Methods in Treating Outliers and Symmetrically Heavy-Tailed Distributions for Nonlinear Structural Equation Models with Missing Data

By means of more than a dozen user friendly packages, structural equation models (SEMs) are widely used in behavioral, education, social, and psychological research. As the underlying theory and methods in these packages are vulnerable to outliers and distributions with longer-than-normal tails, a fundamental problem in the field is the development of robust methods to reduce the influence of outliers and the distributional deviation in the analysis. In this paper we develop a maximum likelihood (ML) approach that is robust to outliers and symmetrically heavy-tailed distributions for analyzing nonlinear SEMs with ignorable missing data. The analytic strategy is to incorporate a general class of distributions into the latent variables and the error measurements in the measurement and structural equations. A Monte Carlo EM (MCEM) algorithm is constructed to obtain the ML estimates, and a path sampling procedure is implemented to compute the observed-data log-likelihood and then the Bayesian information criterion for model comparison. The proposed methodologies are illustrated with simulation studies and an example. The research described herein was fully supported by a grant (CUHK 4243/03H) from the Rearch Grants Council of the Hong Kong Special Administration Region. The authors are thankful to the Editor, the Associate Editor, and anonymous reviewers for valuable comments which improve the paper significantly, and are grateful to ICPSR and the relevant funding agency for allowing the use of their data. Requests for reprints should be sent to S. Y. Lee, Department of Statistics, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong.