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.

Pair production of a 125 GeV Higgs boson in MSSM and NMSSM at the ILC

Abstract: In light of the recent LHC Higgs search data, we investigate the pair production of a SM-like Higgs boson around 125 GeV in the MSSM and NMSSM. We first scan the parameter space of each model by considering various experimental constraints, and then calculate the Higgs pair production rate in the allowed parameter space. We find that in most cases the dominant contribution to the Higgs pair production comes from the gluon fusion process and the production rate can be greatly enhanced, maximally 10 times larger than the SM prediction (even for a TeV-scale stop the production rate can still be enhanced by a factor of 1.3). We also calculate the chi(2) value with the current Higgs data and find that in the most favored parameter region the production rate is enhanced by a factor of 1.45 in the MSSM, while in the NMSSM the production rate can be enhanced or suppressed (sigma(SUSY)/sigma(SM) varies from 0.7 to 2.4).

Alkylthiol surface engineering: an effective strategy toward enhanced electrocatalytic N2-to-NH3 fixation by a CoP nanoarray

Abstract: Electrosynthesis of NH3 from N2 addresses the need for renewable electricity storage and provides a promising alternative to the Haber–Bosch process Unfortunately, it is hindered by sluggish kinetics and low faradaic efficiency (FE) due to the strong NN triple bond and competing proton reduction Herein, we propose that the surface engineering of a CoP nanoarray supported on a titanium mesh using hydrophobic octadecanethiol (C18@CoP/TM) is an effective strategy to enhance the electrocatalytic activity of the CoP nanoarray supported on a titanium mesh for ambient N2-to-NH3 conversion Such C18@CoP/TM offers an NH3 yield of 144 × 10−10 mol s−1 cm−2 and a FE of 1403% in 01 M Na2SO4, surpassing its CoP/TM counterpart (0783 × 10−10 mol s−1 cm−2, 583%) Moreover, C18@CoP/TM also shows steady NH3 yield and FE in a six-cycle test with high durability Density functional theory calculations reveal that modifying CoP with a C18 layer leads to a regulated surface electronic structure, which further promotes the catalytic formation of NH3

Intrinsically Low Thermal Conductivity in BiSbSe3: A Promising Thermoelectric Material with Multiple Conduction Bands

Abstract: Bi2Se3, as a Te-free alternative of room-temperature state-of-the-art thermoelectric (TE) Bi2Te3, has attracted little attention due to its poor electrical transport properties and high thermal conductivity. Interestingly, BiSbSe3, a product of alloying 50% Sb on Bi sites, shows outstanding electron and phonon transports. BiSbSe3 possesses orthorhombic structure and exhibits multiple conduction bands, which can be activated when the carrier density is increased as high as ≈3.7 × 1020 cm−3 through heavily Br doping, resulting in simultaneously enhancing the electrical conductivities and Seebeck coefficients. Meanwhile, an extremely low thermal conductivity (≈0.6–0.4 W m−1 K−1 at 300–800 K) is found in BiSbSe3. Both first-principles calculations and elastic properties measurements show the strong anharmonicity and support the ultra-low thermal conductivity of BiSbSe3. Finally, a maximum dimensionless figure of merit ZT ∼ 1.4 at 800 K is achieved in BiSb(Se0.94Br0.06)3, which is comparable to the most n-type Te-free TE materials. The present results indicate that BiSbSe3 is a new and a robust candidate for TE power generation in medium-temperature range.

An Efficient Broadband Slotted Rectenna for Wireless Power Transfer at LTE Band

Abstract: A compact and broadband rectifying antenna (rectenna) which consists of a novel slotted antenna and an efficient rectifying circuit is presented for wireless power transfer at LTE-2300/2500 band. Three different broadband antennas have been investigated and compared. It is found that the newly designed antenna which combines the annular slot radiation patch and a slotted ground plane (GP) has the widest bandwidth and the best matching characteristic. A new broadband dual-stub matching network is proposed to maximize the transmission of wireless power and enhance the reliability of the rectifier when the input power and load varies. In addition, the ground of the rectifier is directly connected to the GP of the antenna for compactness and low energy loss. The proposed designs have been simulated, fabricated, and tested. The results indicate that the proposed receiving antenna performs well at LTE band with a wide bandwidth from 2 to 3.1 GHz. The maximum efficiency of the proposed rectenna reaches 70% at 2.5 GHz under the input power of 5 dBm. Furthermore, the rectenna remains at a relatively efficient power conversion when the load varies in a wide range from 2 to 20 $\text{k}\Omega $ under different low input power, which is of great significance when the ambient radio frequency(F) signal is weak. Therefore, the rectenna is potentially applicable to a wide range of low-power electronic devices by harvesting RF energy at LTE band.

Diphoton signal of the light Higgs boson in natural NMSSM

Abstract: The natural Next-to-Minimal Supersymmetric Standard Model (nNMSSM) is featured by predicting one $CP$-even Higgs boson satisfying ${m}_{{h}_{1}}\ensuremath{\lesssim}120\text{ }\text{ }\mathrm{GeV}$ and Higgsinos lighter than about 300 GeV, and consequently, the cross section for dark matter (DM)-nucleon scattering in this scenario is usually quite large. We study the diphoton signal of the light Higgs boson in nNMSSM by considering the tight constraints from the latest LUX and PandaX-II experiments, and we conclude that the optimal value of the signal rate at 8 TeV LHC is greatly reduced in comparison with earlier predictions. For example, previous studies indicated that the rate may exceed 120 fb for ${m}_{{h}_{1}}\ensuremath{\simeq}80\text{ }\text{ }\mathrm{GeV}$, while it is at most 25 fb if the lightest neutralino in the scenario is fully responsible for the measured DM relic density. We also investigate the case of ${m}_{{h}_{1}}\ensuremath{\simeq}98\text{ }\text{ }\mathrm{GeV}$, which is hinted by the excesses of the large electron proton collider analysis on $Z\overline{b}b$ signal and the compact muon solenoid analysis on the diphoton signal. We conclude that nNMSSM can simultaneously explain the excesses at the $1\ensuremath{\sigma}$ level without violating any known constraints.