Dynamic precipitation at elevated temperatures in a dual-phase AlCoCrFeNi high-entropy alloy: an in situ study

ABSTRACT

The effect of a possible phase transformation or precipitation of the face-centred cubic (FCC) phase on intermediate-temperature deformation of a dual-phase AlCoCrFeNi high-entropy alloy has been studied using in situ tensile testing at 550°C. Electron backscatter diffraction (EBSD) results showed localised precipitation of the FCC phase during the intermediate-temperature deformation. The overall fracture behaviour and crack propagation of the material was not altered much compared to the room-temperature behaviour, namely brittle trans-granular fracture. Deformation at higher temperatures (above 750°C) is suggested as a way to enhance the dynamic FCC phase precipitation, in order to improve the ductility or deformability of the alloy.     

Shear-horizontal surface waves in a half-space of piezoelectric semiconductors

We study the propagation of shear-horizontal waves near the surface of a piezoelectric semiconductor half-space of crystals of class 6 mm with the presence of a biasing electric field in the propagation direction. The three-dimensional equations of linear piezoelectric semiconductors are used. A transcendental equation that determines the dispersion relation is obtained and solved numerically. Results show that the semiconduction affects the wave speed and causes wave dispersion as well as attenuation, and that the waves can be amplified by the biasing electric field.     

诱导细胞凋亡：一个有希望的治疗恶性肿瘤的新模式

长期以来,人们一直被肿瘤的无限增殖所困惑。传统的肿瘤治疗也主要围绕这一认识展开。本文辩证分析了细胞的增殖与凋亡这一对矛盾,认为：肿瘤的本质应该是增殖与凋亡的失衡,诱导细胞凋亡将会成为肿瘤治疗的新模式     

The propagation of everyday prosociality in the workplace

Prosocial behaviors typically benefit those who perform them but can create mixed emotions in recipients. Yet, how does prosociality affect the well-being of those who merely observe it? The current study aimed to answer this question by experimentally prompting employees to perform prosocial acts at work (Givers), be the recipient of such acts (Receivers), or to do neither (Observers). Our focus was on everyday prosociality, which involves kind acts directed at those in one’s social circle, rather than at individuals in need. Social proximity to Givers, but not Receivers, positively predicted boosts in well-being. Indeed, social proximity to Receivers was associated with a nonsignificant trend toward decreased well-being. However, both social proximity to Givers and social proximity to Receivers predicted increases in prosocial behavior among Observers. These results suggest that prosocial behavior and its emotional benefits propagate through social networks, particularly for those in close social proximity to prosocial actors.     

Affinity propagation: An exemplar-based tool for clustering in psychological research

Affinity propagation is a message-passing-based clustering procedure that has received widespread attention in domains such as biological science, physics, and computer science. However, its implementation in psychology and related areas of social science is comparatively scant. In this paper, we describe the basic principles of affinity propagation, its relationship to other clustering problems, and the types of data for which it can be used for cluster analysis. More importantly, we identify the strengths and weaknesses of affinity propagation as a clustering tool in general and highlight potential opportunities for its use in psychological research. Numerical examples are provided to illustrate the method.