Henan Normal University

About: Henan Normal University is a education organization based out in Xinxiang, China. It is known for research contribution in the topics: Catalysis & Ionic liquid. The organization has 10863 authors who have published 11077 publications receiving 166773 citations.

Exclusive radiative B-meson decays within the aligned two-Higgs-doublet model

Abstract: In the aligned two-Higgs-doublet model, the alignment of Yukawa matrices in flavour space guarantees the absence of tree-level flavour-changing neutral currents, while allowing at the same time for new sources of CP violation, implying potentially large effects in many low-energy processes. In this work we study the constraints from exclusive radiative B → V γ decays, where V denotes a light vector meson. The current experimental data on the CP-averaged branching ratios and the direct CP and isospin asymmetries are analyzed. It is found that, while the branching ratios and direct CP asymmetries do not constrain the parameter space much further compared to the inclusive B → X s,d γ decays, complementary constraints can be obtained from the isospin asymmetries Δ(K*γ) and Δ(ργ). In addition, correlations between the various observables in exclusive B → V γ and inclusive B → X s,d γ decays are investigated in detail, and predictions are made for several so far unmeasured observables.

Single non-noble-metal cobalt atom stabilized by pyridinic vacancy graphene: An efficient catalyst for CO oxidation

Abstract: The low operating temperature, high efficiency and noble-metal-free are the goal of the ideal catalysts. In present study, an efficient noble-metal-free catalyst for CO oxidation with a single cobalt atom incorporated with pyridinic nitrogen graphene (Co-N 3 -gra) is proposed. The catalytic activity for CO oxidation via various mechanisms on the Co-N 3 -gra catalyst is investigated using the first-principles method. It is found that the CO oxidation occurs preferably following the Langmuir-Hinshelwood mechanism (CO + O 2 → OOCO → CO 2 + O) with an energy barrier of 0.86 eV for the rate-limiting step of OOCO formation. Our findings prove that the activity of noble-metal-free Co-N 3 -gra catalyst is comparable to or even higher than some other single noble-metal-graphene based catalysts.