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.     

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.     

Sample Size Calculation for Estimating or Testing a Nonzero Squared Multiple Correlation Coefficient

The problems of hypothesis testing and interval estimation of the squared multiple correlation coefficient of a multivariate normal distribution are considered. It is shown that available one-sided tests are uniformly most powerful, and the one-sided confidence intervals are uniformly most accurate. An exact method of calculating sample size to carry out one-sided tests (null hypothesis may involve a nonzero value for the multiple correlation coefficient) to attain a specified power is given. Sample size calculation for computing confidence intervals for the squared multiple correlation coefficient with a specified expected width is also provided. Sample sizes for powers and confidence intervals are tabulated for a wide range of parameter configurations and dimensions. The results are illustrated using the empirical data from Timm (1975) Timm, N. H. 1975. Multivariate analysis with applications in education and psychology, Belmont, CA: Wadsworth.  [Google Scholar] that related scores from the Peabody Picture Vocabulary Test to four proficiency measures.     

The Influence of Number of Categories and Threshold Values on Fit Indices in Structural Equation Modeling with Ordered Categorical Data

This study examines the unscaled and scaled root mean square error of approximation (RMSEA), comparative fit index (CFI), and Tucker–Lewis index (TLI) of diagonally weighted least squares (DWLS) and unweighted least squares (ULS) estimators in structural equation modeling with ordered categorical data. We show that the number of categories and threshold values for categorization can unappealingly impact the DWLS unscaled and scaled fit indices, as well as the ULS scaled fit indices in the population, given that analysis models are misspecified and that the threshold structure is saturated. Consequently, a severely misspecified model may be considered acceptable, depending on how the underlying continuous variables are categorized. The corresponding CFI and TLI are less dependent on the categorization than RMSEA but are less sensitive to model misspecification in general. In contrast, the number of categories and threshold values do not impact the ULS unscaled fit indices in the population.     

海德格尔与世界问题的发生:一个"Topology"的标画

本文着重指出：是“无人称句”唤醒了海德格尔对思想的源初惊讶——而这是目前国内的海学研究还没有关注的,即“无人称句”(Eswehet,Esgibt Welt)所指引的问题。但本文不在于论证与展开海氏对这个问题的具体解决,而在于从海德格尔的现象学解释学方法勾勒出世界问题的“拓扑学”(Topology),即首先显示了他对传统世界观哲学的“拆毁”,然后他把世界问题“还原”到无人称句上,最后用形式指示方式“重建”本几的成事的世界。     

Impact of face masks on perceptions of black and white targets during the COVID-19 pandemic

Although the use of face masks was widespread during the COVID-19 pandemic, their impact on social perceptions is unclear. Notably, research that has investigated the influence of masks on personality attributions has focused on a small set of characteristics with a focus on predominantly White targets, and only few studies examining more diverse groups. Because the race of targets has been found to impact impression formation processes in significant ways, it is important to examine diverse racial targets along with a wider range of personality traits. The goal of the present research therefore was to explore how face masks impact a variety of trait attributions for both White and Black targets. Our results indicate that masking faces has positive implications (i.e., more trustworthy, warm, competent, and less threatening) for White but not Black targets. Notably, both White and Black targets with masks compared to without masks were perceived as more attractive, but the effect was smaller for Black targets. Because COVID-19 continues to be a public health emergency of international concern, with infections and deaths occurring around the world and with mask mandates still being implemented in a variety of contexts, knowing how people differentially respond to targets of different races wearing masks remains relevant and important.     

累积环境风险与大学生自伤的关系:情绪调节策略的作用

通过两个子研究分别考察累积环境风险与大学生自伤行为间的关系模式,并探讨注意分散与认知重评两种情绪调节策略对高风险大学生自伤意图的缓解作用。研究1在1066名大学生中采用问卷调查,探索累积环境风险对大学生自伤行为的作用及模式。基于研究1的结果,研究2选取符合高风险背景的62名大学生为被试,采用实验室实验对两种情绪调节策略的作用予以考察。本研究结果表明：累积环境风险对男女大学生自伤行为均有显著的正向作用,且均符合非线性“正加速模式”,但男生群体随累积风险数量增加而引发的自伤行为增长速度明显快于女生。对于高环境风险背景下的大学生,注意分散和认知重评两种策略均能降低其自伤倾向性与自伤认同,但不能降低其自伤意念。这提示应重视对经历了高环境风险的大学生进行情绪调节策略等方面的干预,以减少其采取自伤行为的倾向性。     

养育是一种幸福的体验吗？养育倦怠述评

养育倦怠指的是由于父母角色和长期的养育压力而导致的一组负性症状,具体包括与父母角色相关的极度耗竭感、与子女的情感疏远和父母角色的低效能感。学者们采用风险-资源平衡模型来对养育倦怠进行解释,并围绕其测量、前因变量和后果变量开展了一系列的研究。未来的研究应当重点关注以下问题：澄清养育倦怠的概念内涵,发展科学的测量与评价工具;重视养育倦怠与后果变量之间的关系及其作用机制;充分关注文化因素在养育倦怠研究中的地位和作用。     

同伴侵害对留守青少年主观幸福感的影响:自尊和社会支持的作用

采用追踪设计,对贵州省487名留守青少年进行间隔6个月的两次追踪调查,考察同伴侵害对男女留守青少年主观幸福感的影响以及自尊、教师支持和朋友支持在其中的作用。结果表明：（1）同伴侵害不仅能显著负向预测半年后留守青少年的主观幸福感,还能通过自尊的中介作用间接预测主观幸福感;（2）朋友支持可以显著缓解同伴侵害对男女留守青少年主观幸福感的消极影响：当朋友支持较低时,同伴侵害对男女留守青少年主观幸福感的消极作用显著,当朋友支持较高时则不存在显著影响;（3）教师支持可以显著缓解同伴侵害对留守女生主观幸福感的直接作用：相对于高教师支持的女生,同伴侵害对主观幸福感的影响在低教师支持的女生中更强;教师支持还可以调节留守女生同伴侵害与自尊之间的关系：相对于低教师支持的女生,同伴侵害对自尊的影响在高教师支持的女生中更显著。     

PSYCHOBASIC: A BASIC dialect for the control of psychological experiments with the Commodore-64 and DELA interfacing

A modified version of BASIC for the control of psychological experiments is presented. PSYCHOBASIC runs on Commodore-64 computers with DELA interfacing, and it is based on Commodore BASIC. New commands control digital and analog input and output, centisecond timers, and counters. A control panel, which is displayed on the screen at all times, gives the status of many PSYCHOBASIC components. The interpreted nature of PSYCHOBASIC, as well as the control panel, makes the system easy to learn and use. The PSYCHOBASIC system is less expensive than equivalent systems for IBM-PC computers. A sample PSYCHOBASIC program is given.