Henan University of Technology

About: Henan University of Technology is a education organization based out in Zhengzhou, China. It is known for research contribution in the topics: Catalysis & Starch. The organization has 7648 authors who have published 6503 publications receiving 73067 citations. The organization is also known as: Hénán Gōngyè Dàxué.

Rodlike Sb2Se3 Wrapped with Carbon: The Exploring of Electrochemical Properties in Sodium-Ion Batteries.

Abstract: One-dimensional Sb2Se3/C rods are prepared through self-assembly by inducing anisotropy, and their corresponding sodium storage behaviors are evaluated, presenting excellent electrochemical performances with superior cycling stability and rate capability. Sb2Se3 delivers a high initial charge capacity of 657.6 mA h g–1 at a current density of 0.2 A g–1 between 2.5 and 0.01 V. After 100 cycles, the reversible capacity of Sb2Se3/C is still retained at 485.2 mA h g–1. Even at a high rate current density of 2.0 A g–1, the charge capacity is still retained at 311.5 mA h g–1. Through the analysis of cyclic voltammetry and in situ electrochemical impedance spectroscopy, the in-depth understanding of high rate performances is explored effectively. Briefly, the sodium storage performance of Sb2Se3/C is observably enhanced, benefiting from the 1D structure and the introduction of a carbon layer with robust structure stability and conductivity.

Direct CP Violation in Charmless Three-body Decays of $B$ Mesons

Abstract: Direct $CP$ violation in charmless three-body hadronic decays of $B$ mesons is studied within the framework of a simple model based on the factorization approach. Three-body decays of heavy mesons receive both resonant and nonresonant contributions. Dominant nonresonant contributions to tree-dominated and penguin-dominated three-body decays arise from the $b\ensuremath{\rightarrow}u$ tree transition and $b\ensuremath{\rightarrow}s$ penguin transition, respectively. The former can be evaluated in the framework of heavy meson chiral perturbation theory with some modification, while the latter is governed by the matrix element of the scalar density $⟨{M}_{1}{M}_{2}|{\overline{q}}_{1}{q}_{2}|0⟩$. Resonant contributions to three-body decays are treated using the isobar model. Strong phases in this work reside in effective Wilson coefficients, propagators of resonances, and the matrix element of scalar density. In order to accommodate the branching fraction and $CP$ asymmetries observed in ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, the matrix element $⟨K\ensuremath{\pi}|\overline{s}q|0⟩$ should have an additional strong phase, which might arise from some sort of power corrections such as final-state interactions. We calculate inclusive and regional $CP$ asymmetries and find that nonresonant $CP$ violation is usually much larger than the resonant one and that the interference effect between resonant and nonresonant components is generally quite significant. If nonresonant contributions are turned off in the ${K}^{+}{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}$ mode, the predicted $CP$ asymmetries due to resonances will be wrong in sign when confronted with experiment. In our study of ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, we find that ${\mathcal{A}}_{CP}({\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}})$ should be positive in order to account for $CP$ asymmetries observed in this decay. Indeed, both BABAR and LHCb measurements of ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ indicate positive $CP$ asymmetry in the $m({\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ region peaked at ${m}_{\ensuremath{\rho}}$. On the other hand, all theories predict a large and negative $CP$ violation in ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$. Therefore, the issue with $CP$ violation in ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ needs to be resolved. Measurements of $CP$-asymmetry Dalitz distributions put very stringent constraints on the theoretical models. We check the magnitude and the sign of $CP$ violation in some (large) invariant mass regions to test our model.