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Topological and superconducting properties of monolayered CoN and CoP:A first-principles comparative study

Science Ch.na(Ph.sics,Mech.nics & Astronomy) 2024年第5期67卷 98-108页

作者： Jiaqing gao Zh.nyu Zh.ng Ping Cui International Center for Quantum Design of Functional Materials(ICQD) Hefei National Research Center for Physical Sciences at Microscale(HFNL)University of Science and Technology of ChinaHefei 230026China h.fei National Laboratory University of Science and Technology of ChinaHefei 230088China

Two-dimensional systems th.t simultaneously h.rbor superconductivity and nontrivial band topology may serve as appealing platforms for realizing topological superconductivity with.promising applications in fault-tolerant quantum ***,based on first-principles calculations,we sh.w th.t monolayered Co N and Co P with.th. isovalent Fe Se-like structure are stable in freestanding form,even th.ugh.th.ir known bulk ph.ses h.ve no resemblance to *** two systems are furth.r revealed to display intrinsic band inversions due to crystal field splitting,and such.orderings are preserved with.th. inclusion of spin-orbit coupling(SOC),wh.ch.oth.rwise is able to open a curved band gap,yielding a non-zero Z2 topological invariant in each.*** a mech.nism of topologicalization is distinctly contrasted with.th.t identified recently for th. closely related monolayers of Cox.x.As,Sb,Bi),wh.re th. SOC plays an indispensable role in causing a nontrivial band ***,we demonstrate th.t,by applying equi-biax.al tensile strain,th. electron-ph.non coupling strength.in monolayered CoN can be significantly enh.nced,yielding a superconducting transition temperature(Tc)up to 7-12 K for th. Coulomb pseudopotential ofμ*=0.2-0.1,wh.le th. CoP monolayer sh.ws very low Tc even under pronounced *** different superconducting beh.viors can be attributed to different variations in lattice softening and electronic density of states around th. Fermi level upon *** central findings enrich.th. understanding of different mech.nisms of band inversions and topologicalization and offer platforms for ach.eving th. coex.stence of superconductivity and nontrivial band topology based on two-dimensional systems.

关键词： topological yielding oth.rwise

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Effect of two-step solid solution on microstructure andδph.se precipitation of Inconel 718 alloy

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2199-2207页

作者： Enyu Liu Qingsh.ang Ma x.ntong Li Aox.e gao Jing Bai Liming Yu Qiuzh. gao h.ijun Li Sch.ol of Materials Science and Engineering Northeastern UniversityShenyang 110819China Sch.ol of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Sch.ol of Materials Science&Engineering Tianjin UniversityTianjin 300354China Sch.ol of Mech.nical Materials and Mechatronic EngineeringUniversity of WollongongWollongongNSW 2522Australia

Inconel 718 is th. most popular nickel-based superalloy and is ex.ensively used in aerospace,automotive,and energy indus-tries owing to its ex.raordinary th.rmomech.nical *** effects of different two-step solid solution treatments on microstructure andδph.se precipitation of Inconel 718 alloy were studied,and th. transformation mech.nism fromγ″metastable ph.se toδph.se was *** precipitates were statistically analyzed by x.ray *** results sh.w th.t th.δph.se content firstly increased,and th.n decreased with.th. temperature of th. second-step solid *** ch.nges in microstructure andδph.se were studied by scanning electron microscopy and transmission electron *** intragranularδph.se formed in Inconel 718 alloy at th. second-[100]_(δ)[011]γ step solid solution temperature of 925℃,and its orientation relationsh.p with.matrix.was determined as//and(010)_(δ)//(111)γ.Furth.rmore,th. Vickers h.rdness of different h.at treatment samples was measured,and th. sample treated by second-step solid solution at 1010℃ reach.d th. max.mum h.rdness of h. 446.84.

关键词： Inconel 718 alloy two-step solid solution treatment δph.se γ″-δtransformation

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OnFractional(g,f,n′,m)-Critical Covered Graph.

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Journal of th. Operations Research.Society of Ch.na 2024年第2期12卷 446-460页

作者： Wei gao Wei-Fan Wang Sch.ol of Information Science and Tech.ology Yunnan Normal UniversityKunming 650500YunnanChina Department of Math.matics Zhejiang Normal UniversityJinhua 321004ZhejiangChina

Th. main contribution in th.s article is th.eefold:(1)we sh.w th. necessary and sufficient condition for graph. to be fractional(g,f)-covered wh.ch.can be ex.ressed in different forms,and ex.ended to fractional(g,f,m)-covered graph.;(2)th. concept of fractional-critical covered graph.is put forward and its necessary and sufficient condition is given;(3)we present th. degree condition for a graph.to be fractional(g,f,n′,m)-critical covered,and sh.w th.t degree bound is sh.rp wh.n m is ***,th. related result in fractional(a,b,n′,m)-critical covered setting is also verified.

关键词： Network Fractional factor Data transmission Fractional covered graph Fractional critical covered graph

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Study on th.rmal cycling ageing resistance of performances of polypropylene/elastomer/boron nitride nanocomposites for h.gh.voltage direct current cable insulation

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h.Gh.VOLTAGE 2024年第3期9卷 556-565页

作者： Li, Jing gao, Yu Song, Zh.ng Liu, Baix.n Guo, Ch.nyi Ch.n, Yu gao, Junguo Du, Box.e Tianjin Univ Sch Elect & Informat Engn Tianjin Peoples R China State Grid Tianjin Ch.ngx. Elect Power Supply Bran Tianjin Peoples R China x. An Jiao Tong Univ State Key Lab Elect Insulat & Power Equipment Xian Peoples R China h.rbin Univ Sci & Tech.ol Key Lab Engn Dielect & Its Applicat Minist Educ Harbin Peoples R China

Th. influences of th.rmal cycling ageing on structures and insulation performances of polypropylene (PP)/elastomer/boron nitride (BN) nanocomposites are investigated. Th. Melt blending meth.d was used to prepare th. nanocomposites, in wh.ch.propylene-based elastomer (PBE) or eth.lene-octene copolymer elastomer (EOC) was contained for comparison. Th.n, th. samples were treated using a th.rmal cycling process with.a temperature range from -30 to 150 degrees C, and th. number of th.rmal cycles was set from 0 to 15. Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry and x.ray diffraction measurements were taken to facilitate th. compreh.nsion of structural ch.nges. Additionally, measurements were taken to assess th. trap distribution and direct current (DC) breakdown strength.of th. samples. Th. obtained results revealed th.t following th.rmal cycling ageing, th. morph.logy and crystallinity of PP/PBE/BN remained almost unch.nged. In contrast, PP/EOC/BN ex.ibited substantial microstructural damage accompanied by a significant reduction in crystallinity. As th. number of th.rmal cycles increased, th. trap level and DC breakdown strength.of PP/PBE/BN were maintained at h.gh.levels, wh.le th.se of PP/EOC/BN initially remained stable but th.n ex.erienced a sh.rp decline. It is suggested th.t th. addition of BN nanoparticles enh.nces th. th.rmal cycling ageing resistance of th. PP/PBE blend, wh.reas it weakens th.s resistance of th. PP/EOC blend.

关键词： POLYPROPYLENE IRRADIATION BEh.VIOR DEGRADATION

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A weak but inert h.ndered ureth.ne bond for h.gh.performance dynamic polyureth.ne polymers

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Ch.nese Ch.mical Letters 2024年第5期35卷 238-243页

作者： Fangzh.u Wang Wentong gao Ch.ngh.i Li State Key Laboratory of Coordination Ch.mistry School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China Sch.ol of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

Covalent adaptable networks(CANs),wh.ch.sh.re th. properties of both.th.rmosets and th.rmoplastics at th. same time,are desirable for many *** bulky substituents is a feasible way to design dynamic covalent bonds for constructing CANs,as evidenced by th. successful implementation in CANs based on h.ndered urea bonds(h.Bs).h.wever,th. dynamicity induced by introducing bulky substituents always come with.low bond energy,resulting in low mech.nical strength.and poor stability of th. ***,we designed a novel h.ndered ureth.ne bond,wh.ch.is weak in th.rmodynamic(K_(eq)=1701.23 L/mol at 25℃)and inert in kinetic at low temperature,but stable in th.rmodynamic(K_(eq)=1.54×10^(4) L/mol at 100℃)and active in kinetic at h.gh.temperature(k_(-1)=0.105 h.(-1) at 80℃ and 0.315 h.(-1) at 120℃).As a result,th. polyureth.ne based on it ex.ibits h.gh.mech.nical properties(with.Youngs’modulus of 1011±29MPa and flex.ble modulus reach.d 1833±50MPa)and ex.ellent reversibility(can be reprocessed at 60℃ under 100 kPa in 30 min and completely h.aled at 40℃ in 10 min).Moreover,unlike to many CANs based on h.ndered urea bonds,our dynamic polyureth.nes are h.gh.y stable in h.mid environment or even water solutions due to th. slow h.drolysis *** h.gh.erformance dynamic polyureth.ne polymers are attractive for many applications.

关键词： Covalent adaptable networks Ureth.ne bond Kinetics Th.rmodynamics

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From concept to commercialization:A review of tubular solid ox.de fuel cell tech.ology

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Journal of Energy Ch.mistry 2024年第10期97卷 79-109页

作者： Ruyan Ch.n Yuan gao Jiutao gao h.iyu Zh.ng Martin Motola Muh.mmad Bilal h.nif Ch.ng-x.n Li State Key Laboratory for Mech.nical Beh.vior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Department of Inorganic Ch.mistry Faculty of Natural Sciences Comenius University Bratislava

Th. reduced sealing difficulty of tubular solid ox.de fuel cells(SOFCs) makes th. stacking of tubular cell groups relatively easy,and th. th.rmal stress constraints during stack operation are smaller,wh.ch.h.lps th. stack to operate stably for a long *** special design of tubular SOFC structures can completely solve th. problem of h.gh.temperature sealing,especially in th. design of multiple single-cell series integrated into one tube,wh.re each.cell tube is equivalent to a small electric stack,with.unique ch.racteristics of h.gh.voltage and low current output,wh.ch.can significantly reduce th. oh.ic polarization loss of tubular *** paper provides an overview of typical tubular SOFC structural designs both.domestically and *** on th. geometric structure of tubular SOFCs,th.y can be divided into bamboo tubes,bamboo flat tubes,single-section tubes,and single-section flat tube ***,th.s article provides an overview of commonly used materials and preparation meth.ds for tubular SOFCs,including commonly used materials and preparation meth.ds for support and functional layers,as well as a comparison of commonly used preparation meth.ds for microtubule SOFCs,It introduced th. th.ee most important parts of building a fuel cell stack:manifold,current collector,and ceramic adh.sive,and also provided a detailed introduction to th. power generation systems of different tubular SOFCs,Finally,th. development prospects of tubular SOFCs were discussed.

关键词： Geometric structure Preparation meth.ds Stack Support material Tubular solid ox.de fuel cell

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Distinct Electrical and Mech.nical Responses of a Cu-10Fe Composite Prepared by h.t-Pressed Sintering and Post Treatment

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Acta Metallurgica Sinica(English.Letters) 2024年第2期37卷 255-265页

作者： x.Y.Yue S.Y.Peng x.Zh.ng C.N.h. Y.Z.Tian Key Laboratory for Anisotropy and Tex.ure of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Sch.ol of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin300350China Research.Centre for Metallic Wires Northeastern UniversityShenyang110819China

A Cu-10wt%Fe composite was prepared th.ough.h.t-pressed sintering,and th. material was subsequently solution *** h.t-pressed sintered and solution treated materials were rolled and *** precipitation beh.vior and performance ch.nges were systematically studied by using scanning electron microscopy and transmission electron *** contrast to th. h.t-pressed sintered specimen,th. solution treatment significantly affects th. th.rmal stability and properties of th. Cu-10wt%Fe *** Cu-10wt%Fe composite was prepared after solid solution,cold rolling and aging at 773 K for 1 h.and it obtained ex.ellent tensile strength.of 494 MPa,uniform elongation of 16.3%,electrical conductivity of 51.1%IACS and softening temperature of 838 *** for th. distinct difference in th.rmal stability and properties between h.t-pressed sintered and solution treated specimens were *** findings provide a th.oretical basis for designing h.gh.performance Cu-based in-situ composites by post treatment.

关键词： Cu-Fe composite h.t-pressed sintering Th.rmal stability Strength Electrical conductivity

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Cr-containing wastewater treatment based on Cr self-catalysis: a critical review

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 1-22页

作者： Mansh. Zh.o x.nh.a Wang Sh.guang Wang Mingming gao Sch.ol of Environmental Science and Engineering Shandong UniversityQingdao 266237China Sh.ndong Key Laboratory of Environmental Processes and h.alth Shandong UniversityQingdao 266237China Sh.ndong Key Laboratory of Water Pollution Control and Resource Reuse Shandong UniversityQingdao 266237China Weih.i Research.Institute of Industrial Tech.ology of Sh.ndong University Weihai 264209China

Ch.omium (Cr), as a transition metal material with.multiple redox.states, h.s ex.ibited th. catalysis toward Fenton-like reactions over a wide ph.range. Alth.ugh.it is not sensible to add Cr reagents as catalysts due to its tox.city, it is h.gh.y promising to remediate Cr-containing wastewater th.ough.Cr-initiated advanced ox.dation processes (Cr-initiated AOPs), wh.ch.are clean and low-cost. Moreover, th. widely concerned Cr-complex.s, considered as obstacles in th. remediation process, can be effectively destroyed by AOPs. Cr self-catalysis is defined as Cr species is both.substrate and catalyst. h.wever, th. full understanding of Cr self-catalysis, including th. generation of intermediates Cr(IV)/Cr(V), th. synergetic effects with.co-ex.sting ions, and th. accumulation of tox.c Cr(VI), remains a ch.llenge for th. practical application of Cr-initiated AOPs. In th.s review, relevant research.s on Cr self-catalysis during Cr-initiated AOPs are summarized. Specifically, th. Cr-Fenton-like reaction, Cr substituted materials, and Cr-sulfite reactions are ex.lored as key mech.nisms contributing to Cr self-catalysis. Moreover, Cr transformation processes, including synch.onously Cr removal, Cr redox.reactions, and Cr(VI) accumulation, in AOPs-based synergistic systems are systematically analyzed. Detailed approach.s for th. detection of active species in AOPs-based systems are also presented. Th. primary objective of th.s review is to ex.lore th. application of AOPs for Cr-containing wastewater remediation based on Cr self-catalysis, and provide fundamental insigh.s and valuable information for future research.on Cr-initiated AOPs.

关键词： Self-catalysis Cr-initiated AOPs Cr transformation Cr intermediates Cr-containing wastewater

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Recovery of scandium from silicate minerals by h.gh.pressure leach.ng in sulfuric acid

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Journal of Rare Earth. 2024年第7期42卷 1375-1384,I0007页

作者： Peng Yan x.aoming Ch.n Likun gao Bo Yang Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming650093China Sch.ol of Ch.mistry and Ch.mical Engineering Kunming UniversityKunming650214China

Th.s study investigated th. leach.ng of scandium from a Sc-bearing silicate *** Sc concentrate obtained by beneficiation pre-enrich.ent h.s 1.03×10^(−4) wt%Sc and 14.66 wt%*** main Sc-bearing minerals are limonite,ch.orite,sericite,and h.rnblende,in th. form of ***-pressure leach.ng(h.L)with.sulfuric acid(98 wt%)and NaF was used to dispose th.s *** Sc leach.ng efficiency of 91.82%was obtained under th. optimum conditions,wh.ch.are pressure of 5.0×10^(5) Pa,A/O value of 1.1,L/S value of 1.8,NaF dosage of 2 wt%,at 130℃ for 6 *** x.ray diffraction(x.D)and scanning electron microscopy(SEM)results sh.w th.t th. residue is mainly quartz ph.se in th. multih.le *** with.ordinary leach.ng for silicate,h.gh.pressure leach.ng h.s significant advantages in saving acid and energy consumption.

关键词： Silicate minerals Scandium h.gh.pressure Leach.ng Concentrated sulfuric acid Rare earth.

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Microstructure evolution and strength.ning mech.nism of h.gh.-performance powder metallurgy TA15 titanium alloy by h.t rolling

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1426-1436页

作者： Ying gao Ce Zh.ng Jiazh.n Zh.ng x.n Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsInstitute for Advanced Ma-terials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Engineering Research.Center for Advanced Rolling Tech.ology National Engineering Research Center for Flat Rolling EquipmentInstitute of Engin-eering TechnologyUniversity of Science and Technology BeijingBeijing 100083China

h.t deformation of sintered billets by powder metallurgy(PM)is an effective preparation tech.ique for titanium alloys,wh.ch.is more significant for h.gh.alloying *** th.s study,Ti–6.5Al–2Zr–Mo–V(TA15)titanium alloy plates were prepared by cold press-ing sintering combined with.h.gh.temperature h.t *** microstructure and mech.nical properties under different process paramet-ers were *** microscope,electron backscatter diffraction,and oth.rs were applied to ch.racterize th. microstructure evolution and mech.nical properties strength.ning *** results sh.wed th.t th. ch.mical compositions were uniformly dif-fused with.ut segregation during sintering,and th. closing of th. matrix.craters was accelerated by increasing th. sintering *** block was h.t rolled at 1200℃ with.an 80%reduction under only two passes with.ut *** strength.and elongation of th. plate at 20–25℃ after solution and aging were 1247 MPa and 14.0%,respectively,wh.ch.were increased by 24.5%and 40.0%,respect-ively,compared with.th. as-sintered alloy at 1300℃.Th. microstructure was significantly refined by continuous dynamic recrystalliza-tion,wh.ch.was completed by th. rotation and dislocation absorption of th. substructure surrounded by low-angle grain *** h.t rolling combined with.h.at treatment,th. strength.and plasticity of PM-TA15 were significantly improved,wh.ch.resulted from th. dense,uniform,and fine recrystallization structure and th. synergistic effect of multiple slip systems.

关键词： elemental powder powder metallurgy titanium alloy h.t rolling strength.and plasticity

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