Effect of couple stress at the interfaces of a nano-hole on the anti-plane electro-mechanical behavior

In piezoelectric nanocomposites, surface/interface plays an important role in determining the size-dependent behavior of media. Within the framework of couple stress, the effect of surface/interface around a nano-hole on the anti-plane electro-mechanical behavior is examined. By introducing a surface/interface model, the stress and electric displacement effects on the size-dependent behavior are both considered. The governing equations in piezoelectric materials are decoupled into the classical ones. The displacement and electric potential are expressed by Bessel functions. By satisfying the boundary conditions around the hole with the interface/surface effect, the expanded coefficients are obtained. Through analysis, it is shown that the mechanical and electrical fields drastically depend on the relative size of the hole with respect to the characteristic length of the material. The effects of couple stresses on the stress and electric field are also addressed. Comparison with the existing results is also given.     

Thermophysical properties of substantially undercooled liquid Ti-Al-Nb ternary alloy measured by electromagnetic levitation

The thermophysical properties of undercooled liquid alloys at high temperature are usually difficult to measure by experiment. Here, we report the specific heat of liquid Ti₄₅Al₄₅Nb₁₀ ternary alloy in the undercooled state. By using electromagnetic levitation technique, a maximum undercooling of 287?K (0.15 T _L) is achieved for this alloy. Its specific heat is determined to be 32.72?±?2.51?J?mol^?1 K^?1 over a broad temperature range of 1578–2010?K.     

Molecular dynamics simulations of the size effect of titanium single-crystal nanopillars orientated for double prismatic slips

An inverse “smaller is stronger” trend is predicted on the basis of molecular dynamics simulations of α-titanium (Ti) single-crystal nanopillars orientated for double prismatic slips when the nanopillars are less than 7?nm wide. This trend is attributed to a significant increase in the surface energy due to the nucleation and propagation of edge dislocations on the surface of the pillars.     

Global or Domain Specific Self-Esteem: Can it Predict Aggression Among Children and Adolescents?

The study examined whether self-esteem predicted aggression among children and adolescents. Through a multistage method of sampling, the study utilized 170 (N = 170) participants from primary (elementary) and secondary (high) schools across Trinidad. Participants completed a demographic questionnaire, The Culture Free Self Esteem Inventory (CFSEI), and the Direct and Indirect Aggression Scale (DIAS). Using hierarchical regression analyses, both global and domain specific measures of self-esteem were used as predictors of the three types of aggression: direct physical, direct verbal and indirect aggression. The results revealed that global self-esteem was a stronger predictor of aggression for children than domain specific self-esteem. However, domain specific self-esteem was a stronger predictor of aggression among adolescents. As it relates to aggression, the pathways to global self-esteem differed from domain specific self-esteem. Implications for the comparative use of multidimensional and global self-esteem were discussed, and recommendations for future research have been proposed.     

Investigating local and global effects of surface colours and contours in amodal completion

ABSTRACT

We studied interpretations of partly occluded shapes. Models that account for amodal completion mostly deal with local and global contour characteristics. In the current study, we were interested in the effects of colour on local and global contour completions. In our stimuli, local contour completions comprised simple linear extensions of the partly occluded contours, whereas global contour completions accounted for global shape regularities. Our stimuli were designed such that the visible surface colour could also be completed in a local or global fashion, being consistent or inconsistent with contour completions. We tested the preferred interpretations of the partly occluded shapes by using a sequential matching task. Participants had to judge whether a test shape could be a previously shown partly occluded shape. We found that interpretations of partly occluded shapes depend on both colour and contour characteristics. Additional time bin analyses revealed that for fast responses colour and contour completions already depend on the visible context of the partly occluded shapes, while for slow responses the congruency between colour and contour completions play a role as well.     

情绪劳动的效应、影响因素及作用机制

情绪劳动是指员工遵照一定的组织规则, 在工作场所与顾客互动过程中进行的情绪调节。研究证明情绪劳动对组织情境中一系列结果变量影响显著, 既有积极影响也有消极影响, 作用对象包括施动者员工、受动者顾客和规则制定者组织。情绪劳动与结果变量的关系受多个员工、工作和顾客特征变量的影响。资源保存理论为情绪劳动的作用机制提供了一种有力的解释。即时、短期与长期效应的整合、指向内部顾客的情绪劳动以及组织氛围的影响是未来研究值得关注的方向。     

Workplace spirituality buffers the effects of emotional labour on employee well-being

This research examines how workplace spirituality buffers the detrimental relationship between emotional labour and subjective well-being among two samples of service workers in the United States and southern China. Drawing on conservation of resources theory, we found that the negative relationship between surface acting and subjective well-being was moderated by workplace spirituality. Specifically, employees with high spirituality were buffered from the harmful effects of surface acting on subjective well-being, whereas employees with low spirituality were not. We found no evidence of a moderating effect on the relationship between deep acting and subjective well-being. These findings shed light on individual differences that influence the emotional labour process and expand our knowledge of cross-cultural similarities and differences in emotion management.     

The standard ontological framework of cognitive neuroscience: Some lessons from Broca’s area

Since cognitive neuroscience aims at giving an integrated account of mind and brain, its ontology should include both neural and cognitive entities and specify their relations. According to what we call the standard ontological framework of cognitive neuroscience (SOFCN), the aim of cognitive neuroscience should be to establish one-to-one mappings between neural and cognitive entities. Where such entities do not yet closely align, this can be achieved by reforming the cognitive ontology, the neural ontology, or both. In order to assess the limits and the possibilities of the SOFCN, we will examine a paradigmatic case study: the concept of Broca’s area, which indicates an alleged mapping between the left inferofrontal gyrus and the production of language. We review evidence showing that such a mapping does not hold, thus calling into question either the status of Broca’s area or the validity of the SOFCN. We then propose some strategies for addressing the issue and suggest that it may be solved within the SOFCN by adopting both of the following strategies: first, more accurately defining the relevant neural structures and second, switching the focus of neural ontology from structures to events, individuated by a where (neural structures) conjoint with a how (oscillatiory frequency).