Renmin University of China

About: Renmin University of China is a education organization based out in Beijing, Beijing, China. It is known for research contribution in the topics: China & Population. The organization has 11325 authors who have published 15498 publications receiving 238419 citations. The organization is also known as: Renmin University & People's University of China.

Unconventional anisotropic s-wave superconducting gaps of the LiFeAs iron-pnictide superconductor.

Abstract: We have performed high-resolution angle-resolved photoemission spectroscopy on Fe-based superconductor LiFeAs (T(c)=18 K). We reveal multiple nodeless superconducting (SC) gaps with 2Δ/k(B)T(c) ratios varying from 2.8 to 6.4, depending on the Fermi surface (FS). We also succeeded in directly observing a gap anisotropy along the FS with magnitude up to ~30%. The anisotropy is fourfold symmetric with an antiphase between the hole and electron FSs, suggesting complex anisotropic interactions for the SC pairing. The observed momentum dependence of the SC gap offers an excellent opportunity to investigate the underlying pairing mechanism.

Shared leadership: A state-of-the-art review and future research agenda

Abstract: The traditional “great man” approaches to leadership emphasize qualities of individual leaders for leadership success. In contrast, a rapidly growing body of research has started to examine shared leadership, which is broadly defined as an emergent team phenomenon whereby leadership roles and influence are distributed among team members. Despite the progress, however, the extant literature on shared leadership has been fragmented with a variety of conceptualizations and operationalizations. This has resulted in little consensus regarding a suitable overarching theoretical framework and has undermined developing knowledge in this research domain. To redress these problems, we provide a comprehensive review of the growing literature of shared leadership by: 1) clarifying the definition of shared leadership, 2) conceptually disentangling shared leadership from other theoretically overlapping constructs, 3) addressing measurement issues, and 4) developing an integrative framework of the antecedents, proximal and distal consequences, and boundary conditions of shared leadership. We end our review by highlighting several new avenues for future research.

Abusive supervision and subordinate supervisor-directed deviance: The moderating role of traditional values and the mediating role of revenge cognitions

Abstract: This study examined the link between abusive supervision and subordinate supervisor- directed deviance by focusing on the moderating role of traditionality and the mediating role of revenge cognitions directed towards supervisors. The results of analysing 283 supervisor-subordinate dyads in six private electronic companies and 222 supervisor-subordinate dyads in two state-owned oil and gas companies in the People's Republic of China showed that abusive supervision was positively related to revenge cognitions directed towards supervisors and to supervisor-directed deviance. In addition, traditionality moderated the above relationships such that they were stronger among low traditionalists than among high ones, while revenge cognitions mediated the main effect of abusive supervision and the interactive effect of abusive supervision and traditionality on supervisor-directed deviance.

Absence of superconductivity in single-phase CaFe 2 As 2 under hydrostatic pressure

Abstract: Recent high-pressure studies found that structural/magnetic phase transitions are very pressure sensitive in ${\text{CaFe}}_{2}{\text{As}}_{2}$ and that superconductivity can be achieved under modest pressure, although details of the sharpness and temperature of transitions vary between liquid medium and gas medium measurements. To better understand this issue, we performed high-pressure susceptibility and transport studies on ${\text{CaFe}}_{2}{\text{As}}_{2}$, using helium as the pressure medium. The signatures of the transitions to the low-temperature orthorhombic and collapsed tetragonal phases remained exceptionally sharp, and no signature of bulk superconductivity was found under our hydrostatic conditions. Our results suggest that superconductivity in ${\text{CaFe}}_{2}{\text{As}}_{2}$ is associated with a low-temperature, multicrystallographic-phase sample that is the result of nonhydrostatic conditions associated with the combination of a first-order structural phase transition and frozen liquid media.

Mechanism of arsenic poisoning on SCR catalyst of CeW/Ti and its novel efficient regeneration method with hydrogen

Abstract: Deactivation and regeneration of arsenic are studied on novel CeO2–WO3/TiO2 for selective catalytic reduction (SCR) of NOx with NH3. It is found that the activity and N2 selectivity of poisoned catalyst are inhibited immensely at the entire temperature range. The fresh, poisoned and regenerated catalysts are characterized using XRD, BET, XPS, H2-TPR, NH3-TPD, NO + O2-TPD, in situ Raman and in situ DRIFTS. The characterization results indicate that the poisoning of arsenic decrease BET surface area, surface Ce3+ concentration and the amount of Lewis acid sites and adsorbed NOx species but increase the reducibility and number of chemisorbed oxygen species. According to the in situ DRIFTS investigations, the adsorption of surface-adsorbed NH3 and NOx species is suppressed at low temperature, while the reactivity between surface-adsorbed NH3 and NO is prohibited at high temperature. A novel H2 reduction regeneration not only effectively removes arsenic from the poisoned catalysts, but promotes surface Ce3+/Ce4+ ratio and form new NOx adsorptive sites. However, it also affects the chemical properties of catalyst such as crystalline Ce2(WO4)3 forming, surface active oxygen species raise and loss of Bronsted acid sites.