Xing Zhou

© 2017 American Ceramic Society.Nano- and microscale CeO2-ZrO2 shape memory ceramics are promising materials for smart micro-electro-mechanical systems, sensing, actuation and energy damping applications, but the processing science for scalable production of such small volume ceramics has not yet been established. Herein, we report a modified sol-gel method to synthesize highly monodisperse spherical CZ particles with diameters in the range of ~0.8-3.0 μm. Synchrotron X-ray micro-diffraction confirmed that most of the particles are single crystal after annealing at 1450°C. Having a monocrystalline structure and a small specimen length scale, the particles exhibit significantly enhanced shape memory and superelasticity properties with up to ~4.7% compression being completely recoverable. Highly reproducible superelasticity through over five hundred strain cycles, with dissipated energy up to ~40 MJ/m3 per cycle, is achieved in the CZ particles containing 16 mol% ceria. This cycling capability is enhanced by ten times compared with our first demonstration using micropillars. Furthermore, the effects of cycling and testing temperature on superelasticity have been investigated.

© 2016 AIP Publishing LLC.We present evidence for breathing modes in magnetron sputtering plasmas: periodic axial variations of plasma parameters with characteristic frequencies between 10 and 100 kHz. A set of azimuthally distributed probes shows synchronous oscillations of the floating potential. They appear most clearly when considering the intermediate current regime in which the direction of azimuthal spoke motion changes. Breathing oscillations were found to be superimposed on azimuthal spoke motion. Depending on pressure and current, one can also find a regime of chaotic fluctuations and one of stable discharges, the latter at high current. A pressure-current phase diagram for the different situations is proposed.

A small but growing body of research suggests that witnessing mistreatment affects third-party observers’ attitudes and behaviors. Based on the framework of belief in a just world theory, this study examines perverse secondary victimization which is particularly pervasive in negative workplace gossip from a third-party perspective but has nonetheless received little attention in organizational research. We present a moderated mediation model and hypothesize that third-party observers’ deservingness judgment would mediate the effect of observed negative workplace gossip and interact with their just world beliefs in predicting their unfavorable reactions toward the target. Additionally, an observer’s BJW would exacerbate the positive relationship between observed negative workplace gossip and deservingness judgment, that is, third-party observers with high BJW are more susceptible to victim derogation bias and consider that the target of gossip deserved the victimization experience to maintain their worldview. Data were collected from 210 full-time employees through online questionnaires and the empirical results supported the hypotheses. The study discusses the theoretical and practical implications of the findings.

Cyberloafing is prevalent in the workplace and research has increasingly focused on its antecedents. This study aims to extend the cyberloafing literature from the perspective of perceived overqualification among civil servants. Drawing on equity theory, we examined the effect of POQ on cyberloafing, along with the mediating role of harmonious passion on the POQ–cyberloafing relationship and the moderating role of the need for achievement on strengthening the link between POQ and harmonious passion. Using time-lagged data from a sample of 318 civil servants in China, we found that POQ was positively related to cyberloafing; harmonious passion mediated this relationship; the need for achievement moderated the effect of POQ on harmonious passion as well as the indirect effect of POQ on cyberloafing via harmonious passion. Based on the findings, we discussed theoretical and managerial implications and provided future research avenues.