自我概念、自立人格与师范生教师职业成熟度的关系

采用师范生教师职业成熟度问卷、田纳西自我概念量表和青少年学生自立人格量表对986名师范生进行调查,考察自我概念、自立人格对师范生教师职业成熟度的影响。结果表明:(1)师范生的自我概念与其自立人格、教师职业成熟度及其职业态度和职业能力均存在显著的正相关;师范生的自立人格与其教师职业成熟度、职业态度和职业能力也存在显著正相关;(2)师范生的自我概念主要通过影响其自立人格间接地正向预测教师职业能力;自我概念不仅可以直接显著地正向预测教师职业成熟度和职业态度,还可以通过影响个体的自立人格进而间接地正向预测教师职业成熟度和教师职业态度。这一结果表明自立人格在自我概念影响教师职业能力的关系中起着完全中介作用,而在自我概念影响教师职业成熟度和教师职业态度的关系中起着部分中介作用。     

An EM algorithm for fitting two-level structural equation models

Maximum likelihood is an important approach to analysis of two-level structural equation models. Different algorithms for this purpose have been available in the literature. In this paper, we present a new formulation of two-level structural equation models and develop an EM algorithm for fitting this formulation. This new formulation covers a variety of two-level structural equation models. As a result, the proposed EM algorithm is widely applicable in practice. A practical example illustrates the performance of the EM algorithm and the maximum likelihood statistic.We are thankful to the reviewers for their constructive comments that have led to significant improvement on the first version of this paper. Special thanks are due to the reviewer who suggested a comparison with the LISREL program in the saturated means model, and provided its setup and output. This work was supported by National Institute on Drug Abuse grants DA01070, DA00017, and a UNH 2002 Summer Faculty Fellowship.     

弱智儿童视觉-动作控制的实验研究

该研究探讨了弱智儿童视觉-动作控制能力。弱智儿童被试30人,平均年龄13.5岁,平均智商53.9。实验结果与正常人的结果作了比较。结果显示,弱智儿童的视觉-动作控制能力只相当五六岁正常儿童的水平,远落后于正常中青年及老年的水平。这表明,智力缺陷与发展水平对人的视觉-动作控制能力有明显影响。     

The Love equation for the normal loading of a rigid cone on an elastic half-space: no need for a modification

A new schematic diagram is presented which shows the displacement paths of surface particles within the contact circle when a rigid cone is loaded normally on an elastic half-space. With the help of this diagram and the information available in the literature, it is argued here that a modification made to the Love equation in 1999 is unnecessary and incorrect. It is also shown that the modification results in an incorrect expression for the surface radial displacement outside the contact circle. Therefore, it is suggested that the modification be dropped forthwith.     

Effects of loading modes on densification efficiency of spark plasma sintering: sample study of zirconium carbide consolidation

Theoretical studies on the densification kinetics of the new spark plasma sinter-forging (SPS-forging) consolidation technique and of the regular SPS have been carried out based on the continuum theory of sintering. Both modelling and verifying experimental results indicate that the loading modes play important roles in the densification efficiency of SPS of porous ZrC specimens. Compared to regular SPS, SPS-forging is shown to be able to enhance the densification more significantly during later sintering stages. The derived analytical constitutive equations are utilised to evaluate the high-temperature creep parameters of ZrC under SPS conditions. SPS-forging and regular SPS setups are combined to form a new SPS hybrid loading mode with the purpose of reducing shape irregularity in the SPS-forged specimens. Loading control is imposed to secure the geometry as well as the densification of ZrC specimens during hybrid SPS process.     

How age affects memory task performance in clinically normal hearing persons

The main objective of this study is to investigate memory task performance in different age groups, irrespective of hearing status. Data are collected on a short-term memory task (WAIS-III Digit Span forward) and two working memory tasks (WAIS-III Digit Span backward and the Reading Span Test). The tasks are administered to young (20–30 years, n = 56), middle-aged (50–60 years, n = 47), and older participants (70–80 years, n = 16) with normal hearing thresholds. All participants have passed a cognitive screening task (Montreal Cognitive Assessment (MoCA)). Young participants perform significantly better than middle-aged participants, while middle-aged and older participants perform similarly on the three memory tasks. Our data show that older clinically normal hearing persons perform equally well on the memory tasks as middle-aged persons. However, even under optimal conditions of preserved sensory processing, changes in memory performance occur. Based on our data, these changes set in before middle age.     

Rotation to Simple Loadings Using Component Loss Functions: The Oblique Case

Component loss functions (CLFs) similar to those used in orthogonal rotation are introduced to define criteria for oblique rotation in factor analysis. It is shown how the shape of the CLF affects the performance of the criterion it defines. For example, it is shown that monotone concave CLFs give criteria that are minimized by loadings with perfect simple structure when such loadings exist. Moreover, if the CLFs are strictly concave, minimizing must produce perfect simple structure whenever it exists. Examples show that methods defined by concave CLFs perform well much more generally. While it appears important to use a concave CLF, the specific CLF used is less important. For example, the very simple linear CLF gives a rotation method that can easily outperform the most popular oblique rotation methods promax and quartimin and is competitive with the more complex simplimax and geomin methods. The author would like to thank the editor and three reviewers for helpful suggestions and for identifying numerous errors.     

听障学生与正常学生性别角色识别的比较研究

本研究采用内隐联想测验(IAT),对听障学生和正常学生进行了性别角色识别的比较研究,旨在探究性别角色识别的内隐认知特点及群体差异性。实验表明,听障学生的相容辨别和不相容辨别的反应时都显著高于正常学生,而准确率都低于正常学生,这说明听障学生性别角色识别的认知发展滞后于正常学生。本文认为,性别角色识别是一种内隐社会认知,是各类学生性意识发展的认知基础,教育者应通过各种有效途径,保证各类学生从小时候起就正确地进行性别角色的识别和扮演,以促进其性心理和性道德健康地发展。     

汉语聋生与健听生口语叙事和书面叙事发展特征的比较研究

以小学3-5年级的汉语聋生为被试,考察其口语叙事与书面叙事的发展特征,并与健听生比较,揭示聋生叙事发展特征的特异性。结果发现：（1）无论口语叙事还是书面叙事,聋生和健听生在宏观结构上表现相当,但聋生在微观结构上表现较差。（2）在宏观结构和平均句长上,无论健听生还是聋生,书面叙事得分均显著好于口语叙事;（3）在词汇密度上,健听生在口语叙事和书面叙事上的表现相当,但聋生的词汇密度在口语叙事下表现较差。（4）在词汇丰富性和词汇密度指标上,聋生和健听生存在年级间发展特征的差异。研究结果对聋生的叙事教学有重要启示。     

Attachment, Behavioral Inhibition, and Anxiety Disorders Symptoms in Normal Adolescents

The current study examined relationships between attachment style, behavioral inhibition, and anxiety disorders symptoms not only relying on youths' self-report but also including the parents' point of view. A large group of young adolescents aged 11–15 years and their parents (N = 280) completed measures of attachment style and behavioral inhibition and the Revised Children's Anxiety and Depression Scale, a questionnaire designed to measure symptoms of anxiety disorders in terms of the Diagnostic and Statistical Manual of Mental Disorders. Highly similar results were found for child and parent report. That is, attachment style and behavioral inhibition were found to be interrelated with insecure attachment being associated with higher levels of behavioral inhibition. Furthermore, adolescents who were classified as insecurely attached and/or high on behavioral inhibition displayed higher levels of anxiety disorders symptoms. Finally, attachment status and behavioral inhibition both accounted for a unique proportion of the variance of anxiety disorders symptomatology.