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Impurity formation mech.nism of silicon carbide crystals smelted by Ach.son process

Journal of Iron and Steel Research.International 2024年第6期31卷 1367-1375页

作者： dong Feng h.ng-qiang Ru Xu-dong Luo Jie-gang You Ling zhang Sch.ol of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Institute of Advanced CeramicsSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819LiaoningChina Liaoning Institute of Science and Tech.ology Benxi 117004LiaoningChina

In order to furth.r promote th. application of SiC refractories in modern steel metallurgy,th. occurrence forms and formation mech.nism of impurities in SiC crystals smelted by Ach.son process were *** tech.iques of inductively coupled plasma-atomic emission spectrometry,X-ray diffraction,and scanning electron microscopy were combined to examine th. types and occurrence forms of impurities in smelted SiC *** results sh.wed th.t th. main impurities in th. SiC are free Si,free C,oxides(CaO·Al_(2)O_(3)·2SiO_(2),3Al_(2)O_(3)·2SiO_(2),CaO·SiO_(2) and SiO_(2))and alloy ph.ses(Fe_(x)Si_(y),Fe_(x)Si_(y)Ti_(z) and Fe_(x)Al_(y)Si_(z)).Th. formation process of impurities during th. smelting of SiC can be described as follows:At h.gh.temperature,th. SiO_(2) and Fe,Ti related oxide impurities present in th. raw materials are reduced to Si,Fe,and Ti metal *** th. reduction process,th. free Si,Fe_(x)Si_(y) and Fe_(x)Si_(y)Ti_(z) are precipitated from th. melt during *** Si primarily exists in aggregated form with.n th. SiC crystal,wh.le th. alloy ph.se is predominantly found at th. interface between SiC and free Si,with.Fe_(x)Si_(y)Ti_(z) embedded with.n *** th. end of th. cooling process,oth.r impurity oxides such.as Al_(2)O_(3),CaO,and some unreduced SiO_(2) solidify to form calcium-aluminum-silicate glass ph.ses,predominantly located between SiC *** remaining C from th. reaction is mainly dispersed as free C with.n th. SiC crystal and at th. interface between SiC and free Si.

关键词： Impurity element Formation mech.nism Smelted SiC crystal SiC refractory Occurrence form

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Research.on Regional Differences and Influencing Factors of Ch.na's Carbon Emissions

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Journal of Systems Science and Information 2024年第2期12卷 161-190页

作者： Likang zhang Jich.ng dong Zh. dong Sch.ol of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Tech.ology and Engineering Center for Space Utilization Chinese Academy of SciencesBeijing 100045China

Th.s paper studies th. regional differences,dynamic evolution and influencing factors of regional carbon emission intensity(CEI)in 262 cities and 5 regional urban agglomerations(UAs)in *** Dagum Gini coefficient is used to analyze th. intra-regional and inter-regional differences in carbon emissions,and th. temporal evolution of th. absolute differences of CEI among regions is analyzed by means of kernel density estimation(KDE).Th. paper provides an in-depth.study on th. spatial difference and temporal evolution of CEI in Ch.nese cities and major strategic *** Moran index and LISA’s test,th. spatial correlation of carbon emission in prefecture-level cities is tested,and its spatial agglomeration ch.racteristics are *** is found th.t Ch.na’s CEI is decreasing year by year,presenting a spatial pattern of“low in th. south.but h.gh.in th. north..Based on th. calculation of carbon emission intensity at th. urban level,th.s paper conducts LDMI factor decomposition research.on carbon emission intensity at th. national and key regions,and analyzes th. impact of th. impact factors on carbon emission *** research.results provide a path.for Ch.na’s green development at th. city level and urban agglomeration level,and a th.oretical support for different regions and cities to introduce emission and carbon reduction policies.

关键词： carbon emission intensity regional differences industrial structure

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Ch.rge qubits based on ultra-th.n topological insulator films

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Frontiers of ph.sics 2024年第3期19卷 71-81页

作者： Kexin zhang h.go V.Lepage Ying dong Crispin h.W.Barnes Research.Center for Quantum Sensing Intelligent Perception Research InstituteZhejiang LabHangzhou 311121China Cavendish.Laboratory Department of PhysicsUniversity of CambridgeCambridge CB30HEUnited Kingdom

We study h.w to use th. surface states in a Bi2Se3 topological insulator ultra-th.n film th.t are affected by finite size effects for th. purpose of quantum *** demonstrate th.t:(i)surface states under th. finite size effect can effectively form a two-level system wh.re th.ir energy levels lie in between th. bulk energy gap and a logic qubit can be constructed,(ii)th. qubit can be initialized and manipulated using electric pulses of simple forms,(iii)two-qubit entanglement is ach.eved th.ough.a√SWAP operation wh.n th. two qubits are in a parallel setup,and(iv)alternatively,a Floquet state can be exploited to construct a qubit and two Floquet qubits can be entangled th.ough.a Controlled-NOT *** Floquet qubit offers robustness to background noise since th.re is always an oscillating electric field applied,and th. single qubit operations are controlled by amplitude modulation of th. oscillating field,wh.ch.is convenient experimentally.

关键词： topological insulator quantum computing nanodevices

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Effect of Composite Composition on th. Contact Angle of B_(4)C-xTiB_(2)/Cu

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Journal of Wuh.n University of Tech.ology(Materials Science) 2024年第5期39卷 1116-1120页

作者： h. dong zhang Xin zhang Jinyong LEI Liwen State Key Laboratory of Advanced Tech.ology for Materials Synth.sis and Processing Wuhan University of TechnologyWuhan 430070China h.bei Key Laboratory of Th.ory and Application of Advanced Materials Mech.nics Wuhan University of TechnologyWuhan 430070China

Th. wetting beh.vior of molten Cu on th. B_(4)C-xTiB_(2)ceramic composites was investigated in th.s *** results sh.w th.t th. contact angle of molten Cu alloy on B_(4)C-TiB_(2)ceramic composites is linear with.th. composition rate of TiB_(2)or B_(4)C wh.le th. temperature is in th. range of 1300 to 1350℃,consistent with.th. expectation of th. commonly used th.oretical ***,a nonlinear relationsh.p between th. contact angle and th. composition rate unexpectedly occurred at temperatures ranging from 1400 to 1500℃.Th. big difference of th. contact angles between th. molten metal and th. components in th. composites was found to be th. key *** result identifies th.t th. commonly used th.oretical meth.d only works at a limited difference of th. contact angle of th. liquid on th. different ph.ses in th. composites,and fails at a big difference.

关键词： wetting B_(4)C-TiB_(2) composites interfacial reaction

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A state-of-th.-art review of th. development of self-h.aling concrete for resilient infrastructure

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Frontiers of Structural and Civil Engineering 2024年第2期18卷 151-169页

作者： dong LU Xi JIANG Yao zhang Sh.owei zhang Guoyang LU Zh.n LENG Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Laboratory of Fire Safety School of Safety Engineering and Emergency ManagementShijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Arch.tecture and Civil Engineering City University of Hong KongHong Kong 999077China

Th. brittleness of cement composites makes cracks almost inevitable,producing a serious limitation on th. lifespan,resilience,and safety of concrete *** address th.s brittleness,self-h.aling concrete h.s been developed for regaining its mech.nical and durability properties after becoming cracked,th.reby promising sustainable development of concrete *** paper provides a compreh.nsive review of th. latest developments in self-h.aling *** begins by summarizing th. meth.ds used to evaluate th. self-h.aling efficiency of ***,it compares strategies for ach.eving h.aling *** th.n discusses th. typical approach.s for developing self-h.aling ***,critical insigh.s are proposed to guide future studies on th. development of novel self-h.aling *** review will be useful for research.rs and practitioners interested in th. field of self-h.aling concrete and its potential to improve th. durability,resilience,and safety of concrete infrastructure.

关键词： resilient infrastructure sustainable concrete self-h.aling cracks

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Effect of Mn Addition and h.at Treatment on th. Corrosion Beh.viour of Mg-Ag-Mn Alloy

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Acta Metallurgica Sinica(English.Letters) 2024年第4期37卷 665-677页

作者： You Lv Yupeng zhang Xi Liu Zeh.a dong Xiaorong Zh.u Xinxin zhang Key Laboratory of Material Ch.mistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China h.bei Engineering Research.Centre for Biomaterials and Medical Protective Materials Huazhong University of Science and TechnologyWuhan430074China Corrosion and Protection Centre Department of MaterialsThe University of ManchesterManchesterM139PLUK

Th. h.gh.corrosion sensitivity and th. potential bio-toxicity of Mg-Ag alloys limit th.ir wide applications for th. production of implanted devices. In th. present work, Mn is added into th. Mg-Ag alloy to optimize its corrosion beh.viour. Th. corrosion beh.viour of Mg-Ag-Mn alloys is investigated with.th. underlying microstructural factors examined. Th. Mg-Ag alloy with.2 wt% Mn exh.bits th. h.gh.st corrosion resistance after post-casting h.at treatment at 440 ℃. Th. addition of Mn results in α-Mn ph.se with.th. incorporation of Fe, wh.ch.suppresses th. cath.dic activity of impurity Fe. Furth.r, h.at treatment of th. cast alloys h.mogenizes th. distribution of Ag and promotes th. precipitation of α-Mn ph.se. Th. former removes Ag segregations as potential cath.des;th. latter promotes a more uniform distribution of cath.des and, th.refore, prevents localized corrosion.

关键词： Mg-Ag alloy Mn addition Post-casting h.at treatment Cath.dic activity Corrosion mech.nism

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Investigation of non-uniform leading-edge tubercles in compressor cascade:Based on multi-objective optimization and data mining

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Ch.nese Journal of Aeronautics 2024年第7期37卷 134-152页

作者： Jiezh.ng dong Wuli Ch. h.oguang zhang Bo LUO Tianyuan JI Ziyun zhang Sch.ol of Power and Energy Northwestern Polytechnical UniversityXi’an 710129China

Corner stall receives noticeable attention in th. aeroengine field as an important ph.nomenon in h.gh.y-load ***-uniform leading-edge tubercles,as an effective meth.d to delay stall,are introduced into th. *** th.s paper,th. sh.pe of leading-edge tubercles was controlled by a th.rd-order Fourier *** judge corner stall,a more precise stall indicator for compressor cascade with.flow control meth.ds was ***,th. total kinetic energy of th. secondary flow at large incidence was adopted as a parameter for stall evaluation to save computing *** results of multiobjective optimization reveal th.t th. loss coefficient exh.bited negligible variation at design incidence,wh.le th. total kinetic energy of secondary flow sh.wed a significant reduction at large incidence,resulting in a substantial increase in stall *** th. optimal profiling cases,th. stall incidencewas delayed from 7.9°to 11.6°.Th. major purpose of th. research.is to provide proper design guidelines for nonuniformleading-edge tubercles and uncover th. flow controlmech.nisms of leading-edge ***,th. geometric features th.t meet different optimization objectives were extracted th.ough.geometric analysis near th. Pareto Front and th.ough.Self-OrganizingMap(SOM)dataminingmeth.ds in th. optimization ***,flow field analysis reveals th. flow control mech.nism of leading-edge *** convex-concave-convex structure at th. 0%-70%blade h.igh. region can form two branch.s of leading-edge vortex pairs th.t are opposite in th. rotation direction to th. passage *** two branch.s of leading-edge vortex pairs mixed with.th. leading-edge separation vortex to form two stronger mixed vortices,wh.ch.can effectively suppress th. development of passage vortex and delay stall incidence.

关键词： Corner stall Non-uniform leading-edge tubercles Stall indicator Stall evaluation parameter Mixed vortex

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Impact of h.(2)S on h.^(0)capture performance over nitrogen-doped carbon microsph.re sorbent:experimental and th.oretical insigh.s

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Frontiers of Ch.mical Science and Engineering 2024年第3期18卷 89-100页

作者： Guopei zhang Xiaoyang zhang Xiangwen Xing Xiangru Kong Lin Cui dong Yong National Engineering Laboratory for Reducing Emissions from Coal Combustion Shandong UniversityJinan250061China Bingtuan Energy Development Institute Shihezi UniversityShihezi832000China

A nitrogen-doped carbon microsph.re sorbent with.a h.erarch.cal porous structure was synth.sized via aggregation-h.droth.rmal *** h.^(0)adsorption performance of th. nitrogen-doped carbon microsph.re sorbent was tested and compared with.th.t of th. coconut sh.ll activated carbon prepared in th. *** effect of h.(2)S on h.^(0)adsorption was also *** nitrogen-doped carbon microsph.re sorbent exh.bited superior mercury removal performance compared with.th.t of coconut sh.ll activated *** th. absence of h.(2)S at a low temperature(≤100℃),th. h.^(0)removal efficiency of th. nitrogen-doped carbon microsph.re sorbent exceeded 90%.Th.s value is significantly h.gh.r th.n th.t of coconut sh.ll activated carbon,wh.ch.is approximately 45%.h.(2)S significantly enh.nced th. h.^(0)removal performance of th. nitrogen-doped carbon microsph.re sorbent at h.gh.r temperatures(100–180℃).Th. h.erarch.cal porous structure facilitated th. diffusion and adsorption of h.(2)S and h.^(0),wh.le th. nitrogen-containing active sites significantly improved th. adsorption and dissociation capabilities of h.(2)S,contributing to th. generation of more active sulfur species on th. surface of th. nitrogen-doped carbon microsph.re *** formation of active sulfur species and h.S on th. sorbent surface was furth.r confirmed using X-ray ph.toelectron spectroscopy and h.^(0)temperature-programmed desorption *** functional th.ory was employed to elucidate th. adsorption and transformation of h.^(0)on th. sorbent surface.h.(2)S adsorbed and dissociated on th. sorbent surface,generating active sulfur species th.t reacted with.gaseous h.^(0)to form h.S.

关键词： nitrogen-doped carbon microsph.re h.(2)S h.^(0)removal adsorption mech.nism

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Synth.sis and Modulation of Low-Dimensional Transition Metal Ch.lcogenide Materials via Atomic Substitution

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Nano-Micro Letters 2024年第9期16卷 49-94页

作者： Xuan Wang Akang Ch.n XinLei Wu Jiatao zhang Jich.n dong Leining zhang Key Laboratory of Cluster Science Ministry of Education of ChinaBeijing Key Laboratory of Photoelectronic and Electrophonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of Chemistry Chinese Academy of SciencesBeijing 100190People’s Republic of China

In recent years,low-dimensional transition metal ch.lcogenide(TMC)materials h.ve garnered growing research.attention due to th.ir superior electronic,optical,and catalytic properties compared to th.ir bulk *** controllable synth.sis and manipulation of th.se materials are crucial for tailoring th.ir properties and unlocking th.ir full potential in various *** th.s context,th. atomic substitution meth.d h.s emerged as a favorable *** involves th. replacement of specific atoms with.n TMC structures with.oth.r elements and possesses th. capability to regulate th. compositions finely,crystal structures,and inh.rent properties of th. resulting *** th.s review,we present a compreh.nsive overview on various strategies of atomic substitution employed in th. synth.sis of zero-dimensional,one-dimensional and two-dimensional TMC *** effects of substituting elements,substitution ratios,and substitution positions on th. structures and morph.logies of resulting material are *** enh.nced electrocatalytic performance and ph.tovoltaic properties of th. obtained materials are also provided,emph.sizing th. role of atomic substitution in ach.eving th.se ***,ch.llenges and future prospects in th. field of atomic substitution for fabricating low-dimensional TMC materials are summarized.

关键词： Transition metal ch.lcogenides Atomic substitution Ion exch.nge Low-dimensional materials Controllable synth.sis

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Effect of wire mesh.casing treatment on axial compressor performance and stability

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Ch.nese Journal of Aeronautics 2024年第3期37卷 60-76页

作者： Ming zhang Jiaming zhang Jiah.o h. Xu dong Dakun SUN Xiaofeng SUN Sch.ol of Energy and Power Engineering Beihang UniversityBeijing 100191China Beih.ng h.ngzh.u Innovation Institute Yuh.ng Hangzhou 310023China National Key Laboratory of Science and Tech.ology on Aero-Engine Aero-Th.rmodynamics Beihang UniversityBeijing 100191China

In th.s paper,a kind of Wire Mesh.Casing Treatment(WMCT)is proposed to improve th. stable operating range of th. *** contrast to th. traditional circumferential groove,as for WMCT,a layer of wire mesh.is laid on th. surface of th. circumferential *** studies were conducted on th. low-speed axial flow compressor,including th. groove width.axial location,and mesh.*** optimum axial location for WMCT is related to its groove width.A h.gh.r wire mesh.count results in a smaller compressor stall margin *** simulations were carried out to study th. effect of WMCT on th. flow structure of th. *** wire mesh.in th. WMCT h.s a certain flow resistance,wh.ch.restricts th. flow into and out of th. *** to th. WMCT,th. flow parameter in th. tip region of th. rotor is less sensitive to ch.nges in th. operating conditions of th. *** WMCT causes th. rotor tip blade loading to sh.ft backward,inh.biting th. formation of spill forward of th. leakage flow,and th.s improving th. stability of th. *** flow resistance on th. groove surface is a new degree-of-freedom for th. casing treatment designer.

关键词： Axial compressor Wire mesh.casing treatment Tip clearance flow Stall margin Blade loading

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