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Rh/CeO_(2) composites prepared by combining dealloying with calcination as an efficient catalyst for CO oxidation and CH4 combustion

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Journal of Rare Earths 2022年第4期40卷 636-644,I0005页

作者： Dong Duan Chunxi hao Gege He Yang wen Zhanbo Sun School of Physics MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed MatterXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics Xi'an Jiaotong UniversityXi'an 710049China

In this paper,a series of Rh/CeO_(2) catalysts with three-dimensional porous nanorod frameworks and large specific surface area were prepared by chemical dealloying Al–Ce–Rh precursor alloys and then calcining in pure O_(2).The effects of the Rh content and calcination temperature on CO oxidation and CH_(4) combustion were studied,and the results reveal that the Rh/CeO_(2) catalysts produced by dealloying melt-spun Al_(91.3)Ce_(8)Rh_(0.7) alloy ribbons and then calcining at 500℃ exhibit the best catalytic activity,the reaction temperatures for the complete conversion of CO and CH_(4) are as low as 90 and 400℃,***,after 150 h of continuous testing at high concentrations of H2O and CO_(2),the nature of the catalyst is not irreversibly destroyed and can still return to its initial level of *** excellent catalytic activity is attributed to a portion of Rh being uniformly distributed on the CeO_(2) nanorod surface in the form of nanoparticles,forming strong Rh–CeO_(2) interfacial *** portion of Rh permeated into the CeO_(2) lattice,which results in a significant increase in the number of oxygen vacancies in CeO_(2),thus allowing more surface active oxygen to be adsorbed and converted from the gas ***,the catalytic reaction can proceed even in an oxygen-free environment due to the excellent oxygen storage performance of the Rh/CeO_(2) catalyst.

关键词： Al-Ce-Rh ribbon Dealloying Rh/CeO_(2)catalyst CO oxidation CH_(4)combustion Rare earths

Three-dimensional graphene and its composite for gas sensors

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Rare Metals 2021年第6期40卷 1494-1514页

作者： Meng hao wen Zeng Yan-Qiong Li Zhong-Chang Wang College of Materials Science and Engineering Chongqing UniversityChongqing 400030China School of Electronic and Electrical Engineering Chongqing University of Arts and SciencesChongqing 400030China International Iberian Nanotechnology Laboratory(INL) Avenida Mestre Jose VeigaBraga 4715-330Portugal

As a two-dimensional(2D)material,graphene shows excellent advantages in the field of gas sensors due to its inherent large specific surface area and unique electrical ***,in the practical application of gas detection,graphene sheet is easy to form irreversible agglomeration and has some limitations such as low sensitivity,long response time and slow recovery speed,which greatly reduce its gas sensing *** a gas sensing material,three-dimensional(3D)porous graphene has been extensively studied in recent years owing to its larger specific surface area and stable *** order to synthesize graphene with different three-dimensional structures,many methods have been ***,the synthesis and assembly of three-dimensional graphene and its composites were reviewed,with emphasis on the application of three-dimensional graphene and its composites in the field of gas *** challenges and development prospects of three-dimensional graphene materials in the application of gas sensors were briefly described.

关键词： Three-dimensional graphene Gas sensor Sensitivity Composites material

An analytical model of hot rolling force for a thick plate by combining globally optimal approximation yield criterion and egg-circular velocity field

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Journal of Iron and Steel Research International 2024年第3期31卷 647-659页

作者： Shun-hu Zhang Yi Zhang wen-hao Tian Yan Li Shagang School of Iron and Steel Soochow UniversitySuzhou 215021JiangsuChina

For the sake of solving the problem that it is difficult to be integrated for the Mises specific plastic power due to its nonlinearity,a new linear criterion,named the globally optimal approximation criterion,is constructed by the polygonal approximation to the Mises *** new criterion is proved to be the linear function of the principal stress componentsσ1,σ2 andσ3 and the trajectory of it on theπ-plane is a non-equiangular but equilateral dodecagon intersecting the Mises *** theoretical results of the current criterion described by the Lode stress parameters are in excellent accordance with the experimental ***,according to the trend that the metallic flow velocity between rollers aggrandizes gradually from the inlet to the outlet during the hot rolling of a thick plate,a biomimetic velocity field is proposed in which the horizontal velocity component fits the egg-circular curve *** velocity field and its simulated results agree quite ***,using the determined linear criterion,energy analysis of the constructed velocity field is utilized to obtain the interior deformation power,while the vector decomposition approach is utilized to obtain the frictional power and shear *** this basis,the overall power is obtained and the analytical solutions are generated for the rolling torque,rolling force and the coefficient of the stress state under different egg curves by minimizing the neutral ***,the parameter optimization of the characteristic parameterρwhich affects the slope of the egg-circular curve is carried out and the best egg-circular curve which can minimize the energy consumption is *** best agreement between the theoretical and observed values of rolling force and rolling torque is under this curve,and the mean relative errors of the rolling torque and rolling force are no more than 2.93%,while the maximum error is no more than 8.35%.

关键词： Yield criterion Plastic deformation Rolling force Velocity field Analytical solution

Activation mechanism of ammonium oxalate with pyrite in the lime system and its response to flotation separation of pyrite from arsenopyrite

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 271-282页

作者： Runpeng Liao Shuming wen Qicheng Feng Jiushuai Deng hao Lai State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Land Resource EngineeringKunming University of Science and TechnologyKunming 650093China Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources Kunming University of Science and TechnologyKunming650093China School of Chemical&Environmental Engineering China University of Mining&Technology(Beijing)Beijing 100083China Liuzhou China-Tin Nonferrous Design and Research Institute Co. Ltd.China Tin GroupLiuzhou 545006China

The activation properties of ammonium oxalate on the flotation of pyrite and arsenopyrite in the lime system were studied in this *** mineral flotation tests showed that the ammonium oxalate strongly activated pyrite in high alkalinity and high Ca^(2+)system,whereas arsenopyrite was almost *** mineral mixtures tests,the recovery difference between pyrite and arsenopyrite after adding ammonium oxalate is more than 85%.After ammonium oxalate and ethyl xanthate treatment,the hydrophobicity of pyrite increased significantly,and the contact angle increased from 66.62°to 75.15°and then to 81.21°.After ammonium oxalate treatment,the amount of ethyl xanthate adsorption on the pyrite surface significantly increased and was much greater than that on the arsenopyrite *** potential measurements showed that after activation by ammonium oxalate,there was a shift in the zeta potential of pyrite to more negative values by adding xanthate.X-ray photoelectron spectroscopy test showed that after ammonium oxalate treatment,the O 1s content on the surface of pyrite decreased from 44.03%to 26.18%,and the S 2p content increased from 14.01%to 27.26%,which confirmed that the ammonium oxalatetreated pyrite surface was more hydrophobic than the untreated ***,ammonium oxalate may be used as a selective activator of pyrite in the lime system,which achieves an efficient flotation separation of S-As sulfide ores under high alkalinity and high Ca2+concentration conditions.

关键词： pyrite arsenopyrite ammonium oxalate flotation separation

A modified supervised learning rule for training a photonic spiking neural network to recognize digital patterns

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Science China(Information Sciences) 2021年第2期64卷 202-210页

作者： Yahui ZHANG Shuiying XIANG Xingxing GUO Aijun wen Yue hao State Key Laboratory of Integrated Service Networks Xidian University State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of MicroelectronicsXidian University

A modified supervised learning rule which is suitable for training photonic spiking neural networks(SNN) is proposed for the first time. The proposed learning rule is independent of the time intervals between actual spike and desired spike or between presynaptic spike and postsynaptic spike. Based on the proposed supervised learning rule, 10 digital images are learned in photonic neural network which consists of 30 presynaptic neurons and 10 postsynaptic neurons. Presynaptic and postsynaptic neurons are photonic neurons based on vertical-cavity surface-emitting lasers with an embedded saturable absorber(VCSEL-SA).The results show that 10 digital images are recognized correctly in photonic SNN after enough ***, the effects of learning rate, the jitters of learning rate, initial weights distribution of SNN and bias current of postsynaptic neurons(VCSELs-SA) on the recognized error are examined carefully based on the proposed learning rule. To the best of our knowledge, such modified supervised learning rule has not yet been reported, which would contribute to training photonic neural networks, and hence is interesting for neuromorphic photonic systems and pattern recognition.

关键词： vertical-cavity surface-emitting laser modified supervised learning rule optical spiking neural networks learning system pattern recognition

Enhanced memory capacity of a neuromorphic reservoir computing system based on a VCSEL with double optical feedbacks

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Science China(Information Sciences) 2020年第6期63卷 164-175页

作者： Xingxing GUO Shuiying XIANG Yahui ZHANG Aijun wen Yue hao State Key Laboratory of Integrated Service Networks Xidian University State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of Microelectronics Xidian University

In this paper, a neuromorphic reservoir computing(RC) system with enhanced memory capacity(MC) based on a vertical-cavity surface-emitting laser(VCSEL) subject to double optical feedbacks(DOF)is proposed and investigated numerically. The aim of this study is to explore the MC of the proposed *** the purpose of comparison, the MC of the VCSEL-based RC system with single optical feedback(SOF)is also taken into account. It is found that, compared with the VCSEL-based RC system subject to SOF,enhanced MC can be obtained for the VCSEL-based RC system with DOF. Besides, the effects of feedback strength, injected strength, frequency detuning as well as injection current on the MC of the VCSEL-based RC system with DOF are considered. Moreover, the influence of feedback delays is also carefully ***, such proposed VCSEL-based RC system with DOF provides a prospect for the further development of the neuromorphic photonic system based on RC.

关键词： vertical-cavity surface-emitting laser nanophotonic reservoir computing memory capacity double feedback information processing

Numerical simulation of gas-liquid two-phase flow impacting fixed structure by CLSVOF/IB method based on OpenFOAM

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Journal of Hydrodynamics 2021年第6期33卷 1176-1189页

作者： wen-kang Meng Ching-hao Yu Jia Li Rui-dong An State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China

In this paper,a coupled level set and volume of fluid,immersed boundary(CLSVOF/IB)method is proposed and implemented into the interFoam solver of the OpenFOAM to simulate the gas-liquid two-phase flows,involving the gas-liquid and fluid-structure *** the volume of fluid(VOF)method,the multidimensional universal limiter with explicit solution(MULES)approach is used to restrain the volume *** approach for calculating the grid characteristic size for the level set(LS)initial function and the re-initialization equation is proposed in order to make it more applicable to non-uniform grids in the finite volume *** the proposed CLSVOF method,the continuous LS function is used to calculate the gas-liquid interface curvature so that the surface tension term can be calculated *** the immersed boundary(IB)method proposed in this paper,a virtual forcing term is introduced in the momentum equation to deal with the fluid-structure interface by defining a solid volume fraction,which is convenient for the three-dimensional numerical *** the present flow field solver,an improved scheme of the velocity predictor loop of the PIMPLE framework is also *** benchmark cases:the Zalesak’s notched disk and a circular bubble at equilibrium,are simulated first to examine the accuracy of the present CLSVOF ***,the effects of several gas-liquid two-phase flows on different fixed structures are *** simulation results are in good agreement with the published numerical and experimental results.

关键词： Volume of fluid(VOF)method level set(LS)method immersed boundary method gas-liquid interface fluid-structure interface

A Liquid–Solid Interface-Based Triboelectric Tactile Sensor with Ultrahigh Sensitivity of 21.48 kPa-1

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Nano-Micro Letters 2022年第6期14卷 28-38页

作者： Jingya Liu Zhen wen hao Lei Zhenqiu Gao Xuhui Sun Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123People’s Republic of China

Traditional triboelectric tactile sensors based on solid–solid interface have illustrated promising application prospects through optimization ***,the poor sensitivity and reliability caused by hard contact-electrification still poses challenges for the practical *** this work,a liquid–solid interface ferrofluid-based triboelectric tactile sensor(FTTS)with ultrahigh sensitivity is *** on the fluidity and magnetism of ferrofluid,the topography of microstructure can be flexibly adjusted by directly employing ferrofluid as triboelectric material and controlling the position of outward *** date,an ultrahigh sensitivity of 21.48 k Pa;for the triboelectric sensors can be achieved due to the high spike microstructure,low Young’s modulus of ferrofluid and efficient solid–liquid interface *** detection limit of FTTS of 1.25 Pa with a wide detection range to 390 k Pa was also *** addition,the oleophobic property between ferrofluid and poly-tetra-fluoro-ethylene triboelectric layer can greatly reduce the wear and tear,resulting in the great improvement of ***,a strategy for personalized password lock with high security level has been demonstrated,illustrating a great perspective for practical application in smart home,artificial intelligence,Internet of things,etc.

关键词： Ferrofluid Tactile sensor Triboelectric nanogenerator Microstructure Ultrahigh sensitivity

Synthesis, Crystal Structure and Biological Evaluation of 6'-Chloro-4'-methylene-3H-spiro[isobenzofuran-1,3'-isochroman]

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Chinese Journal of Structural Chemistry 2019年第1期38卷 89-94,3页

作者： PU Xiu-Ying XU wen-Jun YI Yun-Peng LI hao-wen LIANG Jian-Ping hao Bao-Cheng School of Life Science and Engineering Lanzhou University of Technology Key Laboratory of New Animal Drug Project of Gansu Province Key Laboratory of Veterinary Pharmaceutical Development Ministry of AgricultureInstitute of Husbandry and Pharmaceutical Sciences of CAAS

The title compound 6?-chloro-4?-methylene-3 H-spiro [isoben zofura-1,3?-isochroman], C_(17)H_(13)ClO_2, was prepared and characterized by IR, NMR, HRMS and single-crystal X-ray diffraction. This compound has a bisbenzannulated [5,5]-spiroketals skeleton. It crystallizes in orthorhombic, space group P212121 with a = 13.383(3), b = 7.6120(17), c = 13.793(3) ?, Z = 4, Dc= 1.275 g/cm^3, μ = 0.28 mm^(–1), F(000) = 592, wR = 0.1443 and R = 0.0557. The preliminary biological test showed that the title compound has good anti-bacterial activities in vitro.

关键词： 3H-spiro[isobenzofura-1,3'-isochroman] single-crystal structure anti-bacterial