Browsing by Author "Yan, J"

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    Correlates of Parent-Child Physiological Synchrony and Emotional Parenting: Differential Associations in Varying Interactive Contexts
    (Journal of Child and Family Studies, 2019-04-01) Han, ZR; Gao, MM; Yan, J; Hu, X; Zhou, W; Li, X
    © 2019, The Author(s). Objectives: Parent-child synchrony during interaction might possess important features that underlie parenting processes throughout development. However, little is known regarding the association between parent-child physiological synchrony and emotional parenting behaviors during middle childhood. The main goal of the study was to examine whether emotional parenting was positively or negatively associated with parent-child physiological synchrony for school-age children. Methods: Adopting a biopsychosocial perspective, we incorporated the interbeat interval (IBI) and behavioral observation data of 150 parent-child dyads (child M age = 8.77, SD= 1.80) to explore the patterns of moment-to-moment dyadic physiological synchrony and to investigate whether these patterns were associated with two emotional parenting behaviors (psychological control and psychological unavailability). Results: Our findings provided some initial evidence that in low to moderately stressful situations that mimic daily parent-child interaction, parent-child physiological synchrony was indicative of different emotional parenting behaviors in various parent-child interactive situations. Specifically, in the collaborative context (parent-child working together to complete a task), parent-child physiological synchrony was indicative of less psychological unavailability, whereas in the competitive context (parent-child resolving disagreement with each other), parent-child physiological synchrony was indicative of less psychological control. The study implications and future research directions are discussed. Conclusions: Overall, our findings suggested that dyadic physiological synchrony, indexed by parent-child moment-to-moment matching of IBI, was associated with fewer negative emotional parenting behaviors.
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    Electron-phonon coupling and thermal transport in the thermoelectric compound Mo3Sb7-xTex
    (Physical Review B - Condensed Matter and Materials Physics, 2015-12-07) Bansal, D; Li, CW; Said, AH; Abernathy, DL; Yan, J; Delaire, O
    © 2015 American Physical Society.Phonon properties of Mo3Sb7-xTex (x=0,1.5,1.7), a potential high-temperature thermoelectric material, have been studied with inelastic neutron and x-ray scattering, and with first-principles simulations. The substitution of Te for Sb leads to pronounced changes in the electronic structure, local bonding, phonon density of states, dispersions, and phonon lifetimes. Alloying with tellurium shifts the Fermi level upward, near the top of the valence band, resulting in a strong suppression of electron-phonon screening and a large overall stiffening of interatomic force constants. The suppression in electron-phonon coupling concomitantly increases group velocities and suppresses phonon scattering rates, surpassing the effects of alloy-disorder scattering and resulting in a surprising increased lattice thermal conductivity in the alloy. We also identify that the local bonding environment changes nonuniformly around different atoms, leading to variable perturbation strengths for different optical phonon branches. Changes in phonon group velocities and phonon scattering rates are quantified, highlighting the large effect of electron-phonon coupling in this compound.