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ZnIn_2S_4 flowerlike microspheres embedded with carbon quantum dots for efficient photocatalytic reduction of Cr(Ⅵ)

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Chinese Journal of Catalysis 2018年第12期39卷 1901-1909页

作者： Baibai Liu Xinjuan Liu Lei Li Jianwei Li Can Li Yinyan Gong Lengyuan Niu Xinsheng Zhao chang q.sun Institute of Coordination Bond Metrology and Engineering(CBME) College of Materials Science and EngineeringChina Jiliang UniversityHangzhou 310018ZhejiangChina Chongqing Key Laboratory of Extraordinary Coordination Bond and Advanced Materials Techniques(EBEAM) Yangtze Normal UniversityChongqing 408100China School of Physics and Electronic Engineering Jiangsu Normal UniversityXuzhou 221116JiangsuChina School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Development of efficient heterostructured photocatalysts that respond to visible light remains a considerable *** herein show the synthesis of ZnIn2S4/carbon quantum dot hybrid photocatalysts with flowerlike microspheres via a facile solvothermal *** ZnIn2S4/carbon quantum dot flowerlike microspheres display enhanced photocatalytic and photoelectrochemical activity compared with that of pure *** a content of only 0.5 wt%carbon quantum dots,93%of Cr(VI)is reduced under visible‐light irradiation at 40 *** a co‐catalyst,the carbon quantum dots improve the light absorption and lengthen the lifetime of charge carriers,consequently enhancing the photocatalytic and photoelectrochemical activity.

关键词： ZnIn2S4 Carbon quantum dots Flowerlike microspheres Co‐catalyst Photoelectronchemical

Strain tears and pressure stiffen the phonon band of graphene

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Strain tears and pressure stiffen the phonon band of graphen...

CORRELATION BETWEEN THE ELASTIC AND THE VIBRONIC BEHAVIOR OF NANOSTRUCTURED TITANIA AND THEIR PRESSURE,SIZE,AND TEMPERATURE DEPENDENCE

第十三届全国物理力学学术会议

作者： X.X.Yang Y.Wang J.W.Li chang q.sun Department of Physics Jishou University Institute for quantum Engineering and Micro-Nano Energy Technology Faculty of MaterialsOptoelectronic and PhysicsXiangtan University College of Physics and Electronic Engineering Jiangsu Normal University School of Electrical and Electronic Engineering Nanyang Technological University

We present an analytical solution to reconcile the vibration frequency shifts of graphene under the stimuli of the uniaxial-strain and pressure from the perspectives of bond order-length-strength(BOLS)correlation and the response of the BOLS to the applied *** duplication of measurements clarified that:(i)the pressure-stiffening of phonons results from bond compression and work hardening;(ii)

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Journal of Advanced Dielectrics 2011年第4期1卷 407-416页

作者： X.J.LIU L.K.PAN Z.sun Y.M.CHEN X.X.YANG L.W.YANG Z.F.ZHOU chang q.sun Engineering Research Center for Nanophotonics&Advanced Instrument Ministry of Education Department of Physics East China Normal University Shanghai 200062P.R.China Institute for quantum Engineering and Micro-Nano Energy Technology Key Laboratory of Low-Dimensional Materials and Application Technology and Faculty of Materials and Optoelectronic Physics Xiangtan University Hunan 411105P.R.China School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

Correlation bet ween the elastic and the vibronic behavior of TiO_(2) and their responses to thevariation of crystal size,applied pressure,and measuring temperature has been investig ated basedon the bond order-length-strength correlation *** reproduction of themeasurements clarified that.(i)the elastic modulus(B)and the Raman shifts(△ω)are stronglycorrelated and we can know either one of the B or the △ω from the other;(i)the under-coordination induced cohesive energy loss and the energy density gain in the surface up to skindepth determines the size effect;(ii)bond expansion and bond weakening due to thermalvibration originat es the thermally softened elastic modulus and the Raman shifts;and(iv)bondcompression and bond strengthening results in the mechanically stiffened elastic modulus and theRaman *** the developed premise,one can predict the changing trends of the concernedproperties with derivatives of quantitative information of the atomic cohesive energy,bindingenergy density,Debye tempera ture,and nonlinear compressibility of the specimen.

关键词： TiO_(2)nanostructures elasticity Ramanshift pressure temperature

New groups of solutions to the Whitham-Broer-Kaup equation

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Applied Mathematics and Mechanics(English Edition) 2020年第11期41卷 1735-1746页

作者： Yaji WANG Hang XU q.sun State Key Lab of Ocean Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Australian Research Council Centre of Excellence for Nanoscale BioPhotonics School of ScienceRMIT UniversityMelbourneVIC 3001Australia

The Whitham-Broer-Kaup model is widely used to study the tsunami *** classical Whitham-Broer-Kaup equations are re-investigated in detail by the generalized projective Riccati-equation method.20 sets of solutions are obtained of which,to the best of the authors’knowledge,some have not been reported in *** analysis of the planar dynamical systems is then used to show different phase portraits of the traveling wave solutions under various parametric conditions.

关键词： Whitham-Broer-Kaup equation travelling wave bifurcation analysis projective Riccati-equation method

Fluid flow driven along microchannel by its upper stretching wall with electrokinetic effects

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Applied Mathematics and Mechanics(English Edition) 2018年第3期39卷 395-408页

作者： Hang XU I.POP q.sun Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration State Key Lab of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong University Department of Mathematics Babe§-Bolyai University Particulate Fluids Processing Centre Department of Chemical EngineeringThe University of Melbourne

We develop a mathematical model to describe the flow in a microchannel driven by the upper stretching wall of the channel in the presence of electrokinetic effects. In this model, we avoid imposing any unphysical boundary condition, for instance, the zero electrostatic potential in the middle of the channel. Using the similarity transformation, we employ the homotopy analysis method （HAM） to get the analytical solution of the model. In our approach, the unknown pressure constant and the integral constant related to the electric potential are solved spontaneously by using the proper boundary conditions on the channel walls, which makes our model consistent with the commonly accepted models in the field of fluid mechanics. It is expected that our model can offer a general and proper way to study the flow phenomena in microchannels.

关键词： microchannel electrokinetic effect stretching wall electro-viscous flowmodel

Rules essential for water molecular undercoordination

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Chinese Physics B 2020年第8期29卷 33-47页

作者： chang q.sun School of EEE Nanyang Technological UniversitySingapore 639798

A sequential of concepts developed in the last decade has enabled a resolution to multiple anomalies of water ice and its low-dimensionality,*** concepts include the coupled hydrogen bond(O:H–O)oscillator pair,segmental specific heat,three-body coupling potentials,quasisolidity,and *** anomalies include ice buoyancy,ice slipperiness,water skin toughness,supercooling and superheating at the nanoscale,*** shows consistently that molecular undercoordination shortens the H–O bond and stiffens its phonon while undercoordination does the O:H nonbond contrastingly associated with strong lone pair“:”polarization,which endows the low-dimensional water ice with *** supersolid phase is hydrophobic,less dense,viscoelastic,thermally more diffusive,and stable,having longer electron and phonon *** equal number of lone pairs and protons reserves the configuration and orientation of the coupled O:H–O bonds and restricts molecular rotation and proton hopping,which entitles water the simplest,ordered,tetrahedrally-coordinated,fluctuating molecular crystal covered with a supersolid *** O:H–O segmental cooperativity and specific-heat disparity form the soul dictate the extraordinary adaptivity,reactivity,recoverability,and sensitivity of water ice when subjecting to physical *** is recommended that the premise of“hydrogen bonding and electronic dynamics”would deepen the insight into the core physics and chemistry of water ice.

关键词： hydrogen bonding molecular crystals structural transitions in nanoscale materials liquid-liquid transitions

PLASTIC DEFORMATION BEHAVIOR OF ELECTROFORMED COPPER LINER OF SHAPED CHARGE AT DIFFERENT STRAIN RATES

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Acta Metallurgica Sinica(English Letters) 2003年第1期16卷 72-77页

作者： H.Y.Gao W.H.Tian A.L.Fan q.sun Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China 210 Institute Beijing 100081 China

The paper deals with different plastic deformation behavior of electroformed copper liner of shaped charge, deformed at high strain rate (about 1×107s-1) and normal strain rate (4×10-4s-1). The crystallographic orientation distribution of grains in recovered slugs which had undergone high-strain-rate plastic deformation during explosive detonation was investigated by electron backscattering Kikuchi pattern technique. Cellular structures formed by tangled dislocations and sub-grain boundaries consisting of dislocation arrays were detected in the recovered slugs. Some twins and slip dislocations were observed in specimen deformed at normal strain rate. It was found that dynamic recovery and recrystallization take place during high-strain-rate deformation due to the temperature rising, whereas the conventional slip mechanism operates during deformation at normal strain rate.

关键词： electroformation electron backscattering Kikuchi pattern cellular dislocation structure ultra-high-strain-rate deformation dynamic recovery and recrystallization

Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Forging

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Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 265-277页

作者： L.B.Tong J.H.Chu D.N.Zou q.sun S.Kamado H.G.Brokmeier M.Y.Zheng School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055China School of Materials Science and Engineering.Harbin Institute of Technology Harbin 150001China College of Materials Science and Engineering.Jilin University Changchun 130025China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan Institute of Materials Science and Engineering Clausthal University of TechnologyAgricolastrasse 638678 Clausthal-Zellerfeld.Germany

In this study,the mechanical properties and damping capacities of cast Mg-5.5 Zn-0.6 Zr(weight percent,ZK60)alloys have been simultaneously improved by a facile multi-directional forging(MDF)processing,and the mechanisms of microstructure evolution and texture modification are systematically *** activation of tension twinning occurs during the initial MDF stage,due to the coarse-grained structure of the as-cast *** increasing MDF passes,the continuous dynamic recrystallization(CDRX)results in a fine equiaxed-grain *** typical non-basal texture is formed in the as-MDFed alloy for 6 passes,with the(0001)planes inclined 60°–70°to forged direction and 10°–20°to transverse direction,respectively.A good balance between the strength(~194.9 MPa)and ductility(~24.9%)has been achieved,which can be ascribed to the grain refinement,non-basal texture and fine precipitate *** damping capacity is remarkably improved after MDF processing,because the severe deformation increases the dislocation density,which effectively enlarges the sweep areas of mobile dislocations.

关键词： Mg alloy Multi-directional forging Microstructure Texture evolution Mechanical properties Damping capacity

A Verifiable Trust-Based CP-ABE Access Control Scheme for Cloud-Assisted Renewable Energy Systems

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Computers, Materials & Continua 2025年第1期82卷 1211-1232页

作者： Jiyu Zhang Kehe Wu Ruomeng Yan Zheng Tian Yizhen sun Yuxi Wu Yaogong Guo Department of Control and Computer Engineering North China Electric Power UniversityBeijing102206China State Grid Information&Communication Company of Hunan Electric Power Corporation Changsha410118China State Grid Hunan Electric Power Corporation Chenzhou Power Supply Branch Chenzhou423000China

Renewable Energy Systems(RES)provide a sustainable solution to climate warming and environmental pollution by enhancing stability and reliability through status acquisition and analysis on cloud platforms and intelligent processing on edge servers(ES).However,securely distributing encrypted data stored in the cloud to terminals that meet decryption requirements has become a prominent research ***,managing attributes,including addition,deletion,and modification,is a crucial issue in the access control scheme for *** address these security concerns,a trust-based ciphertext-policy attribute-based encryption(CP-ABE)device access control scheme is proposed for RES(TB-CP-ABE).This scheme effectivelymanages the distribution and control of encrypted data on the cloud through robust attribute key *** introducing trust management mechanisms and outsourced decryption technology,the ES system can effectively assess and manage the trust worthiness of terminal devices,ensuring that only trusted devices can participate in data exchange and access sensitive ***,the ES system dynamically evaluates trust scores to set decryption trust thresholds,thereby regulating device data access permissions and enhancing the system’s *** validate the security of the proposed TB-CP-ABE against chosen plaintext attacks,a comprehensive formal security analysis is conducted using the widely accepted random oraclemodel under the decisional q-Bilinear Diffie-Hellman Exponent(q-BDHE)***,comparative analysis with other schemes demonstrates that the TB-CP-ABE scheme cuts energy/communication costs by 43%,and scaleswell with rising terminals,maintaining average latency below 50ms,ensuring real-time service *** proposed scheme not only provides newinsights for the secure management of RES but also lays a foundation for future secure energy solutions.

关键词： Access control renewable energy systems(RES) ciphertext-policy attribute-based encryption(CP-ABE) security