Plastic stability of bimetals composed of Ti-based metallic glass composite and pure titanium

The plastic stability of bimetals composed of a Ti-based metallic glass composite (MGC) and a pure titanium (PT) under tension has been investigated. The results reveal that the plastic stability of the MGC/PT bimetal is strongly dependent on the thickness fraction of the MGC: when the thickness fraction of the MGC decreases to a critical value, a homogeneous plastic deformation occurs in the MGC/PT bimetals, i.e. the strain localization and necking of the MGC is effectively suppressed. This unique phenomenon is explained using the normalized strain-hardening rate, and the quantitative relationship between the normalized strain-hardening rate of the MGC/PT bimetals and the thickness fraction of the MGC is thereby established.     

Size estimates of action-relevant space remain invariant in the face of systematic changes to postural stability and arousal

Perceptual estimates of action-relevant space have been reported to vary dependent on postural stability and concomitant changes in arousal. These findings contribute to current theories proposing that perception may be embodied. However, systematic manipulations to postural stability have not been tested, and a causal relationship between postural stability and perceptual estimates remains to be proven. We manipulated postural stability by asking participants to stand in three differently stable postures on a force plate measuring postural sway. Participants looked at and imagined traversing wooden beams of different widths and then provided perceptual estimates of the beams’ widths. They also rated their level of arousal. Manipulation checks revealed that the different postures resulted in systematic differences in body sway. This systematic variation in postural stability was accompanied by significant differences in self-reported arousal. Yet, despite systematic differences in postural stability and levels of arousal perceptual estimates of the beams’ widths remained invariant.     

Eavesdropping on character: Assessing everyday moral behaviors

Despite decades of interest in moral character, comparatively little is known about moral behavior in everyday life. This paper reports a novel method for assessing everyday moral behaviors using the Electronically Activated Recorder (EAR)—a digital audio-recorder that intermittently samples snippets of ambient sounds from people’s environments—and examines the stability of these moral behaviors. In three samples (combined N = 186), participants wore an EAR over one or two weekends. Audio files were coded for everyday moral behaviors (e.g., showing sympathy, gratitude) and morally-neutral comparison language behaviors (e.g., use of prepositions, articles). Results indicate that stable individual differences in moral behavior can be systematically observed in daily life, and that their stability is comparable to the stability of neutral language behaviors.     

A comparison of preference‐assessment methods

In Study 1, we evaluated preference stability across 4 preference‐assessment methods for 6 individuals, 5 of whom had autism spectrum disorder and 1 of whom had traumatic brain injury. We also measured participants’ problem behavior as a corollary measure during all assessment methods. The highest mean correlation coefficients and Kendall rank coefficients of concordance across administrations were observed for the paired‐stimulus and multiple‐stimulus‐without‐replacement methods. Lower correspondence across administrations was observed for the free‐operant and response‐restriction methods. Although differentially higher levels of problem behavior did not occur with a single method, lower levels were consistently observed with the free‐operant method. During Study 2, we evaluated the implications of lower coefficients on reinforcer efficacy by comparing an initially identified and an immediately identified high‐preference stimulus in a reinforcer assessment. Initially identified and immediately identified high‐preference stimuli were equally effective reinforcers, suggesting that fluctuations in preference do not necessarily affect reinforcer efficacy in practice.     

Infant sleep-wake behaviors at two weeks,three and six months

Although infant sleep-wake behavior presents several developmental changes during the first six months, literature lacks on reference values and few studies have explored the role of individual change and stability on infant sleep-wake behavior during the first six months. This study aimed (1) to describe infant sleep-wake behaviors during the 24-h period, day and night, at two weeks, three, and six months, (2) and to explore developmental changes and the role of individual change and stability on infant sleep-wake behaviors from two weeks to six months. Ninety-four primiparous mothers completed measures on infant sleep-wake behaviors at two weeks, three and six months. Significant developmental changes were found on infant sleep-wake behaviors from two weeks to six months. Two-week-old infants sleep 13.3 h, spend 8.7 h awake, awake 6.1 times, have 0.4 h of latency to sleep, and 3.2 h of longest sleep period. Three-month-old infants sleep 13.0 h, spend 9.2 h awake, awake 5.5 times, have 0.4 h of latency to sleep, and 5.2 h of longest sleep period. Six-month-old infants sleep 12.2 h, spend 10.0 h awake, awake 5.2 times, have 0.4 h of latency to sleep, and 5.6 h of longest sleep period. Significant individual change and stability were also found on infant sleep-wake behaviors from two weeks to six months. Despite significant developmental and individual changes, individual stability explains a significant amount of the variance on infant sleep-wake behaviors over the first six months of life.     

Stability and change in interests: A longitudinal examination of grades 7 through college

The joint issue of stability and change of interests in adolescence and early adulthood was investigated longitudinally over three years in three different grade cohorts. The patterns of structural stability, mean stability, rank order stability, and profile stability as well as how these patterns were moderated by gender were examined based on three cohorts of grades 7 and 8 (n = 3191), grades 9 and 10 (n = 6818), and grades 11 and 12 (n = 1078) using the Personal Globe Inventory-Short (Tracey, 2010). Results indicated that adherence to the RIASEC circular model was high and stable; there was a lack of appreciable change in interest means; interests were stable; interest crystallization, profile, and pattern were stable. While the results supported late adolescence and early adulthood being a stable period for interests in general, more changes were found among male and younger students. The implication of the current study was discussed along with its limitations and suggestions for future research.     

Are novice drivers competent to take over control from level 3 automated vehicles? A comparative study with experienced drivers

With level 3 automated vehicles poised to appear on the roads soon, takeover remains a major challenge. At present, the effect of manual driving experience on takeover performance is unknown. Therefore, a simulator study was conducted to investigate the influence of driving experience (novice and experienced) on takeover performance in different takeover time budgets (7 s and 5 s) and in combination with a visual secondary task (i.e., surrogate reference task). Data from 48 young and middle-aged participants consisting of 24 novice and 24 experienced drivers were used for this study. Researchers found that the overall stability of evasive maneuvers by novice drivers was considerably worse than that by experienced drivers. A detailed analysis showed that the influence of driving experience on takeover stability was mainly reflected in longitudinal control rather than lateral control. A significant interaction between driving experience and visual secondary task showed that the latter had a substantial impact on the takeover stability of experienced drivers but not on that of novice drivers. Researchers also found that rich manual driving experience cannot make the takeover process of experienced drivers more stable than that of novice drivers under conditions of eye-off-road. In addition, no significant difference was found between novice and experienced drivers in automation disengagement time, takeover time and minimum time to collision. Results indicate that novice drivers have poor takeover stability and weak adaptability, but their longitudinal collision risk is not deteriorated by the lack of manual driving experience.     

幸福感的稳态与跃迁：一个新的整合视角

以往的实证和理论研究对幸福感稳定性与变化性问题持有不同观点。设定点理论认为幸福感通常保持在设定点位置, 动态平衡理论(及其变式——主观幸福感稳态理论)进一步强调幸福感在围绕设定点的某个范围内波动而呈动态平衡状态, 享乐适应理论在动态平衡理论基础上从情绪适应的角度分析了幸福感维持稳定的原因, 这三个理论均强调幸福感维持在某个平衡水平。相反, 持续幸福理论强调幸福感是可以提升的, 能发生长期的变化。这些理论观点的差异本质在于如何看待幸福感的稳定性与变化性, 我们借用生物学中的“稳态”“稳态应激”概念及物理学中的“跃迁”思想, 认为幸福感不仅存在稳态, 也会出现稳态应激, 并可由此引起幸福感稳态的跃升。这一整合视角为幸福感研究提供了新的解释框架, 也对幸福感的持续提升有启发意义。     

负性生活事件与儿童反应性攻击性之间的关系:一个有多重中介变量的结构方程模型

以977名9~14岁学生为对象,探索负性生活事件与儿童反应性攻击性之间的关系。研究使用了反应性与主动性攻击性问卷、Rosenberg自尊量表、青少年生活事件量表、艾森克人格问卷(儿童版)–情绪稳定性维度问卷,建立了以自尊和情绪稳定性作为中介变量,描述负性生活事件与反应性攻击性之间关系的结构方程模型。结果发现,负性生活事件可直接影响儿童反应性攻击性的形成,同时还可以通过改变情绪稳定性来影响反应性攻击性,即当负性生活事件发生时,情绪状态会倾向于不稳定,进而提高反应性攻击性的水平。此外,负性生活事件也会通过降低自尊水平来提高情绪状态的不稳定性,从而提高反应性攻击性的水平。