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Recent progress of two-dimensional metal-base catalysts in urea oxidation reaction

Rare Metals 2024年第8期43卷 3607-3633页

作者： Qi-Xiang Huang fang Wang Yong Liu Bi-Ying Zhang fang-ya guo Zhong-Qiu Jia Hao Wang Tian-Xiang yang Hai-Tao Wu Feng-Zhang Ren Ting-Feng Yi School of Materials Science and Engineering Henan University of Science and Technology School of Environmental Engineering and Chemistry Luoyang Institute of Science and Technology Henan Province International Joint Laboratory of Materials for Solar Energy Conversion and Lithium Sodium Based Battery School of Chemistry and Life Sciences Suzhou University of Science and Technology School of Materials Science and Engineering Northeastern University

Urea oxidation reaction(UOR) is an auxiliary water electrolysis hydrogen production technology developed in recent years to replace oxygen evolution reaction and reduce energy consumption,which can produce hydrogen more efficiently by low theoretical potential,reduce the average cost of electrochemical hydrogen production,and is a frontier research hotspot for renewable hydrogen ***-dimensional(2D) nanomaterials as electrocatalysts have many favorable potential,such as it can effectively reduce the resistivity of materials and increase the specific surface area with *** paper reviews the application of 2D materials in UOR in alkaline *** a cross-sectional comparison of various material performance data including overpotential,Tafel slope,electrochemical active surface area(ECSA) and it stability test was conducted,which could illustrate the differences between materials composed of different *** addition,the main challenges hindering the progress of research on 2D materials in urea electrocatalysis processes and promising materials in this field in future are summarized and *** is believed that this review will contribute to designing and analyzing highperformance 2D urea electrocatalysts for water splitting.

关键词： Water splitting Urea oxidation reaction Two-dimensional Transition metal compounds Nobleon-noble metals

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Analysis on Dissociation of Pyramidal I Dislocation in Magnesium by Generalized-Stacking-Fault Energy

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 876-882页

作者： Qun Zu ya-fang guo Xiao-Zhi Tang Institute of Engineering Mechanics Beijing Jiaotong University

The generalized-stacking-fault energies are calculated to illustrate the dissociation of〈c＋a〉dislocation on pyramidal I plane in *** c surfaces of {1011} plane and its adjacent planes {3034} and {3032} are presented using Liu embedded-atom-method potential method,and one possible dissociation path of 1/3{1123} dislocation on {1011} plane with minimum energy is ***,another two reasonable dissociation paths of 1/3{1123} dislocation successively on {3034} and {3032} planes are also ***,based on molecular dynamics simulations of magnesium single crystals under c-axis compression,the possible slip path is further examined and discussed.

关键词： Generalized-stacking-fault energies (GSFEs) Molecular dynamics (MD) 〈c + a〉 slip Dissociation Magnesium

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Cone-beam computed tomography noise reduction method based on U-Net with convolutional block attention module in proton therapy

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Nuclear Science and Techniques 2024年第7期35卷 89-100页

作者： Xing-Yue Ruan Xiu-fang Li Meng-ya guo Mei Chen Ming Lv Rui Li Zhi-Ling Chen Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai201800China University of Chinese Academy of Sciences Beijing100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai201210China Department of Radiation Oncology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai200025China Shanghai Key Laboratory of Proton therapy Shanghai201801China

Cone-beam computed tomography(CBCT)is mostly used for position verification during thetreatrment ***,severe image artifacts in CBCT hinder its direct use in dosecalculation and adaptive radiation therapy re-planning for proton *** this study,animproved U-Net neural network named CBAM-U-Net was proposed for CBCT noise reductioninproton therapy which is a GBCT denoised U-Net network with convolutional block *** datasets contained 20 groups of head and neck *** CT images wereregistered to CBCT images as ground *** original CBCT denoised U-Net network,sCTU-Net,was trained for model performance *** synthetic CT(SCT)images generated byCBAM-U-Net and the original sCTU-Net are called CBAM-SCT and U-Net-SCT images,*** HU accuracies of the CT,GBCT,and SCT images were compared using fourmetrics:mean absolute error(MAE),root mean square error(RMSE),peak signal-to-noise ratio(PSNR),and structure simila rity index measure(SSIM).The mean values of the MAE,RMSE,PSNR,and SSIM of CBAM-SCT images were 23.80 HU,64.63 HU,52.27 dB,and 09919,respectively,which were superior to those of the U-Net-SCT *** evaluate dosimetricaccuracy,the range accuracy was compared for a single-energy proton *** r-index passrates ofa 4 cm X 4 cm scanned field and simple plan were calculated to compare the effects of thenoise reduction capabilities of the original U-Net and CBAM-U-Net on the dose ***-U-Net reduced noise more effectively than sCTU-Net,particularly in *** proposed a CBAM-U-Net model for CBCT noise reduction in proton *** tothe excellent noise reduction capabilities of CBAM-U-Net,the proposed model provided relativelyexplicit information rega rding patient ***,it maybe be used in dose calculation andadaptive treatment planning in the future.

关键词： Proton therapy Cone-beam CT CBAM-U-Net γ-index

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A molecular dynamics investigation of the deformation mechanism and shape memory effect of epoxy shape memory polymers

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Science China(Physics,Mechanics & Astronomy) 2016年第3期59卷 89-95页

作者： Hua yang Zheng Dao Wang ya fang guo Xing Hua Shi Institute of Engineering Mechanics Beijing Jiaotong University State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

Following deformation, thermally induced shape memory polymers(SMPs) have the ability to recover their original shape with a change in temperature. In this work, the thermomechanical properties and shape memory behaviors of three types of epoxy SMPs with varying curing agent contents were investigated using a molecular dynamics(MD) method. The mechanical properties under uniaxial tension at different temperatures were obtained, and the simulation results compared reasonably with experimental data. In addition, in a thermomechanical cycle, ideal shape memory effects for the three types of SMPs were revealed through the shape frozen and shape recovery responses at low and high temperatures, respectively, indicating that the recovery time is strongly influenced by the ratio of E-51 to 4,4'-Methylenedianiline.

关键词：形状记忆效应形状记忆聚合物分子动力学变形机理环氧二氨基二苯甲烷温度变化形状记忆性能

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Molecular Dynamics Simulations of the Orientation Effect on the Initial Plastic Deformation of Magnesium Single Crystals

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Acta Metallurgica Sinica(English Letters) 2016年第3期29卷 301-312页

作者： Qun Zu ya-fang guo Shuang Xu Xiao-Zhi Tang Yue-Sheng Wang Institute of Engineering Mechanics Beijing Jiaotong University School of Science Wuhan University of Technology

Molecular dynamics simulation is employed to study the tension and compression deformation behaviors of magnesium single crystals with different *** angle between the loading axis and the basal direction ranges from 0° to 90°.The simulation results show that the initial defects usually nucleate at free surfaces,but the initial plastic deformation and the subsequent microstructural evolutions are various due to different loading *** tension simulations exhibit the deformation mechanisms of twinning,slip,crystallographic reorientation and basal/prismatic *** twinning,crystallographic reorientation and basal/prismatic transformation can only appear in the crystal model loaded along or near the a-axis or *** the compression simulations,the basal,prismatic and pyramidal slips are responsible for the initial plasticity,and no twinning is ***,the plastic deformation models affect the yield strengths for the samples with different *** maximum yield stresses for the samples loaded along the c-axis or a-axis are much higher than those loaded in other directions.

关键词： Molecular dynamics simulations Magnesium Plastic deformation Orientation

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Weighted Composition Operators That Preserve Frames On Weighted Hardy Spaces

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Acta Mathematica Sinica,English Series 2024年第7期40卷 1645-1654页

作者： ya Li Dong Rui Liu guo Xiang Lu School of Mathematical Sciences and LPMC Nankai UniversityTianjin300071P.R.China School of Statistics and Mathematics Zhongnan University of Economics and LawWuhan430073P.R.China

In this paper, we characterize weighted composition operators that preserve frames on the weighted Hardy spaces in the unit disk. In particular, we obtain the symbol properties of the bounded invertible weighted composition operators. Moreover, we establish the equivalence between bounded invertible operators and frame-preserving operators. Furthermore, we show that weighted composition operator preserves frames if and only if it preserves the Riesz bases property. Additionally,we investigate the weighted composition operators that preserve tight or normalized tight frames on the Dirichlet space.

关键词： Weighted composition operators Weighted Hardy spaces frames invertible

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Teukolsky-like equations with various spins in spherically symmetric spacetime

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Chinese Physics C 2024年第8期48卷 213-223页

作者： ya guo Hiroaki Nakajima Wenbin Lin School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Mathematics and Physics University of South ChinaHengyang 421001China

We study wave equations with various spins on the background of a general spherically symmetric *** obtain the unified expression of the Teukolsky-like master equations and the corresponding radial equations with the general *** also discuss the gauge dependence in the gravitational-wave equations,which have appeared in previous studies.

关键词： gravitational wave effective one-body dynamics Teukolsky equation wave equations Klein-Gordon equation Weyl equation Maxwell equation

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Bald Eagle Search Optimization Algorithm Combined with Spherical Random Shrinkage Mechanism and Its Application

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Journal of Bionic Engineering 2024年第1期21卷 572-605页

作者： Wenyan guo Zhuolin Hou fang Dai Xiaoxia Wang Yufan Qiang Department of Applied Mathematics School of ScienceXi'an University of TechnologyXian 710054ShaanxiChina

Over the last two decades,stochastic optimization algorithms have proved to be a very promising approach to solving a variety of complex optimization *** eagle search optimization(BES)as a new stochastic optimization algorithm with fast convergence speed has the ability of prominent optimization and the defect of collapsing in the local *** avoid BES collapse at local optima,inspired by the fact that the volume of the sphere is the largest when the surface area is certain,an improved bald eagle search optimization algorithm(INMBES)integrating the random shrinkage mechanism of the sphere is ***,the INMBES embeds spherical coordinates to design a more accurate parameter update method to modify the coverage and dispersion of the ***,the population splits into elite and non-elite groups and the Bernoulli chaos is applied to elite group to tap around potential solutions of the *** non-elite group is redistributed again and the Nelder-Mead simplex strategy is applied to each group to accelerate the evolution of the worst individual and the convergence process of the *** results of Friedman and Wilcoxon rank sum tests of CEC2017 in 10,30,50,and 100 dimensions numerical optimization confirm that the INMBES has superior performance in convergence accuracy and avoiding falling into local optimization compared with other potential improved algorithms but inferior to the champion algorithm and ranking *** three engineering constraint optimization problems and 26 real world problems and the problem of extracting the best feature subset by encapsulated feature selection method verify that the INMBES’s performance ranks first and has achieved satisfactory accuracy in solving practical problems.

关键词： Bald eagle search optimization algorithm Spherical coordinates Chaotic variation Simplex method Encapsulated feature selection

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Anti-corrosive and highly reversible zinc metal anode enabled by the phenolic resin coating

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Rare Metals 2024年第5期43卷 2115-2124页

作者： ya-Ping Wang ya-Di yang Shu-Qi Duan Li Wang Jia-Shuo guo An-Qiang Pan School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Key Laboratory of Special Functional Materials for Ecological Environment and Information(Hebei University of Technology).Ministry of Education Tianjin 300130China Key Laboratory for New Type of Functional Materials in Hebei Province Hebei University of TechnologyTianjin 300130China School of Materials Science and Engineering Central South UniversityChangsha 410083China

Aqueous zinc-ion batteries have attracted much attention due to their high theoretical capacity,low cost high safety,and ***,challenges such as dendrite growth and side reactions severely hinder the electrochemical performance of the Zn anode,leading to low Coulombic efficiency(CE)or even short circuits Herein,phenolic resin(PF)is used as a protective coating on the surface of the zinc metal *** PF layer can greatly improve the corrosion resistance of the Zn electrode in the ***,this artificial electrode/electrolyte interphase also elevates the nucleation barrier and restrains Zn^(2+)2D diffusion,regulating the zinc deposition/dissolution *** a result,PF@Zn symmetric cells exhibit superior performance than that of bare Zn symmetric cells,achieving a stable and dendrite-free cycle of 1400 ***,the carbon nanotube MnO_(2)||PF@Zn(CNT/MnO_(2)||PF@Zn)full cell also delivers a long cycle life with a high-capacity retention of about 180.0 m Ah·g^(-1)after 1400 cycles,far exceeding that of bare Zn *** work provides a facile strategy for achieving a dendrite-free and rechargeable zinc anode.

关键词： Rechargeable aqueous batteries Zn metal anode Phenolic resin Anti-corrosion

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Fabrication of Molecularly Imprinted Electrospun Nanofibers with Mono-amidoxime Functional Ligand for Efficient Decontamination of Toxic Organophosphates

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Chinese Journal of Polymer Science 2024年第4期42卷 446-456页

作者： Lan Wang Peng Jiang ya-Lin Niu Jun-Peng Cao Tian-Ying guo Key Laboratory of Functional Polymer Materials Ministry of EducationInstitute of Polymer ChemistryCollege of Chemistry and Frontier Science Center for the Creation of New Organic SubstancesNankai UniversityTianjin300071China

There is an urgent imperative to discover practical and efficacious artificial catalysts for the expeditious decontamination of toxic organophosphates. Herein, we propose a novel molecularly imprinted approach utilizing electrospun fiber scaffolds. Specifically, an amidoxime-based functional polymer (PMAOX) has been synthesized, which contains amidoxime groups that can act as nucleophiles and ligands for the formation of catalytic active sites. This polymer was blended with polyacrylonitrile (PAN), a well-processable material, to prepare a nanofiber mat using electrospinning techniques. Then, the amidoxime side groups on fiber surface were further cross-linked after the molecular coordination of templates to complete the molecularly imprinting process. This approach can not only enhance the content of functional molecularly imprinted polymers without affecting structural stability, but also combines surface MI technology to fully expose and leverage the advantages of active sites. The as prepared molecularly imprinted electrospun nanofibers MIF-Zn-PMAOX/PAN-6/4 catalyzes the degradation of paraoxon with a half-life of 32 min, and MIF-Ag-PMAOX/PAN catalyzes the degradation of parathion with a half-life of 18 min. The maximum catalytic rate evidence rate enhancements nearly 3700-fold of the self-hydrolysis. Thus, the mono-amidoxime based molecularly imprinted fibers demonstrate the versatility and superiority as self-detoxifying for organophosphates.

关键词： Organophosphateshydrolysis Electrospinning Molecular imprinting

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