Interfacial strengthening of β phase in a fully lamellar structure of TiAl alloy containing W

The strengthening of the β phase in two fully lamellar structures with different lamellar spacing of a Ti–48?at.%?Al–2?W?at.% alloy during creep deformation has been investigated. It was found that the β phase precipitates during aging treatments only within regions of α₂ lamellae following their dissolution. The strengthening of the β phase is more effective in the coarser lamellar structure, because the wider β precipitation zones, which replace the prior coarser α₂ lamellae, hinders dislocation motion stronger than the narrower ones.     

回到发生性-边缘性的终极境域——试论张祥龙先生对儒家“诗”“乐”之教的现象学阐释

在当代中国哲学界,张祥龙先生以其独有的现象学方法所重新发明的儒学思想——笔者将之称为现象学儒学——可谓独树一帜。张祥龙先生的现象学儒学至少有如下两点特色:(1)他极为重视现象学的境域发生分析方法,并将这一方法运用于本原或终极问题,导致他对本原或终极之物的境域发生性理解;(2)他尤为强调这种发生性终极境域的边缘性或边缘构成作用。张祥龙先生对于现象学尤其是现象学方法的这样一种独到、原初的理解,使得他能够发明或重新揭示出儒学的一些久已被遗忘或被遮蔽的思想维度,使其现象学儒学呈现出某种原发的力量。这尤其体现在他对儒家六艺的现象学阐释上。经过他的重新阐释,儒家六艺如诗乐的原初教化作用就体现为:营造并把我们带回到一个个具有原初解放与构成作用的边缘性纯境域,使人摆脱一切对象化的执着或束缚,从而解放人、拯救人,使得人生、国家和礼制在其中兴发更易,最终走向至善至美的境界。     

The Daily Motivators: Positive Work Events,Psychological Needs Satisfaction,and Work Engagement

This study examines the motivational effects of daily positive work events. Drawing on self-determination theory, we investigated the motivational mechanism of two clusters of commonly encountered positive work events—achievement and recognition events—from a within-person perspective. Specifically, we argue that achievement events and recognition events influence subsequent work engagement through satisfying different psychological needs. We tested our model using experience-sampling data from 200 full-time employees over eight workdays. As hypothesised, after controlling for positive affect as an additional mediator, both achievement and recognition events had positive effects on work engagement through psychological needs satisfaction. The results also revealed that achievement and recognition work events had differentiated effects in satisfying different psychological needs. These results shed light on the motivational function of positive work events above and beyond the affective mechanism and explicate the processes through which different types of positive work events relate to work engagement.     

论理学对中国“画气”说的影响

中国画学中以气论画的传统可以追溯到六朝时期,而真正形成具有丰富理论内涵的画气说则在两宋。画气说的形成具有明显的哲学背景,北宋以来的理学思潮是画气说形成的最直接因素。本文认为,理学对画学理论中气论的影响主要集中在三个方面,一是为画气说提供一个有机论的基础,在气机哲学的影响下,中国画学将表现对象活泼生机作为根本目的,这突出体现在山水画和花鸟画中;二是从审美体验角度,中国画学形成了“以气合气”的独特创作思想;三是在绘画艺术形式上,气势论成为一引人注意的理论,六朝时的气韵生动理论获得了新的发展。     

中小学教师的职业倦怠与工作压力、自尊和控制点的关系研究

本研究旨在探讨中小学教师的职业倦怠与工作压力、自尊和控制点的关系。用教师职业倦怠问卷、工作压力调查表、自尊量表和控制点量表对766名教师进行了问卷调查。结果发现：教师的职业倦怠与工作压力、自尊和控制点之间存在显著的相关关系;教师的工作压力、自尊、控制点分别对职业倦怠的情绪衰竭、非人性化、低成就感具有显著的预测作用。     

中文阅读及发展性阅读障碍眼动研究新进展

中文阅读眼动特征的评估参数主要包括注视点停留位置、眼跳、回视和注视时间等。基于眼动技术,并结合生理技术,研究者已揭示出正常读者中文阅读的多方面特点和规律。但对发展性阅读障碍的眼动研究,国内还没有开展起来。从上述两个角度出发,这里总结了正常读者中文阅读的眼动研究,并探讨了发展性阅读障碍者的眼动特征及机制。     

Be mindful in love: Exploring the interpersonal effects of spouse mindfulness on employee work and family outcomes

Mindfulness has received increasing attention from scholars and practitioners, and considerable research has demonstrated the intrapersonal effects of mindfulness at work or at home. Research to date, however, has overlooked potential interpersonal effects of mindfulness across the work and family domains. Drawing on the spillover-crossover model and the mindfulness literature, we investigate the effects of spouse mindfulness at home on employee work and family outcomes. We test our model using dyadic experience-sampling data collected from 125 focal employees and their spouses over 10 consecutive workdays. The results indicated that, at the within-person level, spouse mindfulness at home was positively associated with employee authentic emotional sharing at home, which, in turn, was positively associated with employee positive effect at home but negatively associated with employee negative affect at home. The results also indicated that spouse mindfulness at home had a positive indirect effect on family satisfaction at home and work engagement during the next morning through enhancing employee authentic emotional sharing at home. We discuss the implications of these findings and directions for the mindfulness research.     

Atomic geometry and energetics of carbon nanotube necking

Molecular mechanics simulations were performed to probe the incipient plastic deformation in carbon nanotubes (CNTs), which involves nucleation of Stone–Wales (SW) defects and spiral glide of 5/7 dislocation dipoles that lead to quantized necking through a stepwise reduction in tube diameter. Quantification of the strain-dependent energetics of dislocation glide reveals that such dislocation motions are energetically favoured at high tensile strain. Pre-existing dislocations critically affect subsequent nucleation and separation of SW defects, as manifested by the competing deformation modes of symmetric versus asymmetric necking. The results provide a quantitative basis for the dislocation dynamics simulations of superplastically deformed CNTs.     

Electron microscopy of grain boundaries: An application to RE-Fe-B (RE = Pr or Nd) magnetic materials

Abstract

To study the grain boundaries of the technologically important RE_13.75Fe_80.25B₆ (RE = Pr or Nd) permanent magnets, we developed a new method using small-angle dark-field imaging based on inner-potential differences at the grain boundaries, combined with high-resolution electron microscopy and nanoscale chemical analysis. In both the Pr- and Nd-based melt-quenched die-upset magnets we consistently observed a very thin Fe-rich amorphized intergranular phase at the boundaries, and this finding may have an impact on our understanding of the coercivity mechanism of these materials. Although the value of the method was demonstrated for transition metal-rare earth intermetallics, it may also be applied to grain-boundary studies in other materials.     

Two different types of shear-deformation behaviour in Au–Cu multilayers

Localised shear deformation of a material is usually identified as a particular feature of deformation inhomogeneity. Here, we show two different types of shear deformation-behaviour that occurred in Au–Cu multilayers subjected to microindentation load, namely, a cooperative-layer-buckling-induced shear banding in a nanoscale multilayer and a direct localised shearing across a layer interface along a shear plane in a submicron-scale multilayer. Theoretical analysis indicates that the formation of the two different types of shear deformation in the multilayers depends on a competition between the dislocation-pile-up-induced stress concentration at the layer interface and the barrier strength of the layer interface for glissile dislocation transmission.