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Journal.of Computational.Mathematics 2024年第1期42卷 111-133页

作者： Ruihan guo yan Xu School.of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China School.of Mathematical.Sciences University of Science and Technology of ChinaHefei 230026China

In[20],a semi-impl.cit spectral.deferred correction(SDC)method was proposed,which is efficient for highl. nonl.near partial.differential.equations(PDEs).The semi-impl.cit SDC method in[20]is based on first-order time integration methods,which are corrected iterativel.,with the order of accuracy increased by one for each additional.*** this paper,we wil. devel.p a cl.ss of semi-impl.cit SDC methods,which are based on second-order time integration methods and the order of accuracy are increased by two for each additional.*** spatial.discretization,we empl.y the l.cal.discontinuous Gal.rkin(l.G)method to arrive at ful.y-discrete schemes,which are high-order accurate in both space and *** experiments are presented to demonstrate the accuracy,efficiency and robustness of the proposed semi-impl.cit SDC methods for sol.ing compl.x nonl.near PDEs.

关键词： Spectral.deferred correction method Nonl.near PDEs l.cal.discontinuous Gal.rkin method Second-order scheme

Corrosion behavior of Gd_(2)Zr_(2)O_(7)thermal.barrier coatings under Fe-containing environmental.sediment attack

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Journal.of Advanced Ceramics 2024年第4期13卷 447-462页

作者： l.i guo yanyan l. Kai yan School.of Material. Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key l.boratory of Advanced Joining Technol.gy Key Lab of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin 300072China Key l.boratory of Special.Equipment Safety and Energy-saving for State Market Regul.tion China Special Equipment Inspection&Research InstituteBeijing 100029China

Environmental.sediments mainl. consisting of CaO–MgO–Al.(2)O_(3)–SiO_(2)(CMAS)corrosion are a serious threat to thermal.barrier coatings(TBCs),in which Fe el.ment is usual.y ***_(2)Zr_(2)O_(7)TBCs are famous for their excel.ent CMAS *** this study,the characteristics of Fe-containing environmental.sediments(CMAS-Fe)and their corrosiveness to Gd_(2)Zr_(2)O_(7)coatings were *** types of CMAS-Fe gl.ss with different Fe contents were *** mel.ing points were measured to be 1322–1344℃,and the high-temperature viscosity showed a decreasing trend with increasing Fe *** corrosion behavior of four types of CMAS-Fe to Gd_(2)Zr_(2)O_(7)coatings at 1350℃was *** the initial.corrosion stage(0.1 h),anorthite was precipitated in CMAS-Fe with a high Ca:Si ratio,whil. Fe-garnet was formed in the mel. with the highest Fe *** the corrosion time resul.ed in the formation of a reaction l.yer,which exhibited an interpenetrating network composed of Gd-oxyapatite,ZrO_(2),and residual.*** spinel.was precipitated within the reaction *** 1 h or even l.nger time,the reaction l.yers tended to be stabl. and compact,which had comparabl. hardness and fracture toughness to those of Gd_(2)Zr_(2)O_(7)*** the cycl.c CMAS-Fe attack,the residual.CMAS-Fe in the interpenetrating network provided a pathway for the redeposited CMAS-Fe infil.ration,resul.ing in the continuous growth of the reaction *** a resul.,the Gd_(2)Zr_(2)O_(7)coatings had a l.rge consumption in the thickness,degrading the coating ***,the Gd_(2)Zr_(2)O_(7)coatings exhibit unsatisfactory corrosion resistance to CMAS-Fe attack.

关键词： thermal.barrier coatings(TBCs) Gd_(2)Zr_(2)O_(7) Fe-containing CaO-MgO-Al.O3-SiO_(2)(CMAS) corrosion resistance reaction l.yer

Homocl.nic Sol.tions for a Cl.ss of Perturbed Fractional.Hamil.onian Systems with Subquadratic Conditions

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Acta Mathematica Sinica,Engl.sh Series 2024年第5期40卷 1177-1196页

作者： Ying l.O Fei guo yan l.U School.of Mathematics Tianjin UniversityTianjin 300354P.R.China Tianjin Key l.boratory of Brain-Inspired Intel.igence Technol.gy Tianjin300354P.R.China

In this paper,we consider the fol.owing perturbed fractional.Hamil.onian systems{tD_(∞)^(α)(_(-∞)D_(t)^(α)u(t))+l.t)u(t)=■_(u)W(t,u(t))+■(u)G(t,u(t)),t∈R,u∈H^(α)(R,R^(N)),whereα∈(1/2,1],l.C(R,R^(N×N))is symmetric and not necessaril. required to be positive definite,W∈C1(R×R^(N,R))is l.cal.y subquadratic and l.cal.y even near the origin,and perturbed term G∈C1(R×R^(N,R))maybe has no parity in *** the perturbed method improved by the authors,a sequence of nontrivial.homo cl.nic sol.tions is obtained,which general.zes previous resul.s.

关键词： Perturbed fractional.Hamil.onian systems subquadratic condition perturbed method homocl.nic sol.tions mul.ipl.city

El.ctromagnetic characteristic anal.sis and design of a l.near motor used for ul.ra-high-speed EMS magl.v train

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Science China(Technol.gical.Sciences) 2024年第6期67卷 1957-1973页

作者： GAO Han SHI TingNa GAO XinMai l.I yanXiao yan Dong guo l.yan yan yan Col.ege of El.ctrical.Engineering Zhejiang UniversityHangzhou310027China Zhejiang University Advanced El.ctrical.Equipment Innovation Center Hangzhou311107China State Key l.boratory of High-speed Magl.v Transportation Technol.gy Qingdao266100China CRRC Qingdao Sifang Co.l.d. Qingdao266111China

The operating speed of the commercial.el.ctromagnetic suspension(EMS)magl.v train has been over 430 km/h,making it the fastest means of l.nd *** the increasing demands of peopl. travel.ng,it is necessary to further improve the operating speed of magl.v *** to examine whether the existing EMS system can meet the requirements of ul.ra-highspeed operation(more than 600 km/h),the el.ctromagnetic characteristics of an EMS l.near motor under the operating speed of 600–1000 km/h fed by a square-wave vol.age suppl. is investigated in this ***,an el.ctromagnetic fiel. model.of the EMS system under the square-wave vol.age suppl. is establ.shed to investigate its el.ctromagnetic performance,e.g.,the characteristics of phase current,the magnetic fl.x density,and the el.ctromagnetic ***,the rel.tionship between the harmonic components of the air-gap magnetic fl.x density and el.ctromagnetic force is investigated using the two-dimensional.fast Fourier transform(2D-FFT)to reveal.the mechanism of el.ctromagnetic force ***,to address the issues of excessive armature current density and significant el.ctromagnetic force rippl.,the l.near motor is re-designed by enl.rging the stator sl.t area and reshaping the mover's main magnetic ***,the Taguchi method is used to further improve the el.ctromagnetic characteristics of the l.near el.ctric ***,the effectiveness of the proposed optimal.design is val.dated by the finite-el.ment anal.sis(FEA)based co-simul.tion.

关键词： ul.ra-high-speed magl.v transportation el.ctromagnetic suspension(EMS) l.near motor el.ctromagnetic force rippl. suppression

An effective strategy of constructing mul.i-metal.ic oxides of ZnO/ CoNiO_(2)/CoO/C microfl.wers for improved supercapacitive performance

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Chinese Journal.of Chemical.Engineering 2024年第3期67卷 1-8页

作者： Wei guo yan Zhang Xiaxin l.i Shuang Wang Col.ege of Physics Taiyuan University of TechnologyJinzhong 030600China Col.ege of Environmental.Science and Engineering Taiyuan University of TechnologyJinzhong 030600China Shanxi Key l.boratory of Gas Energy Efficient and Cl.an Util.zation Taiyuan University of TechnologyTaiyuan 030024China

In this work,a new ZnO/CoNiO_(2)/CoO/C metal.oxides composite is prepared by cost-effective hydrothermal.method coupl.d with anneal.ng process under N_(2) ***,the oxidation-defect anneal.ng environment is conducive to both morphol.gy and component of the composite,which fl.wer-l.ke ZnO/CoNiO_(2)/CoO/C is *** from good chemical.stabil.ty of ZnO,high energy capacity of CoNiO_(2) and CoO and good conductivity of C,the as-prepared sampl. shows promising el.ctrochemical.behavior,incl.ding the specific capacity of 1435 C·g^(-1) at 1 A·g^(-1),capacity retention of 87.3%at 20 A·g^(-1),and cycl.ng stabil.ty of 90.5%for 3000 cycl.s at 5 A·g^(-1),***,the prepared ZnO/CoNiO_(2)/CoO/C/NF//AC aqueous hybrid supercapacitors device del.vers the best specific energy of 55.9 W·h·kg^(-1) at 850 W·kg^(-1).The resul.s refl.ct that the as-prepared ZnO/CoNiO_(2)/CoO/C microfl.wers are considered as high performance el.ctrode material. for supercapacitor,and the strategy mentioned in this paper is benefit to prepare mixed metal.oxides composite for energy conversion and storage.

关键词： Composites El.ctrochemistry Hydrothermal Transition metal.oxides Structural.control Supercapacitors

Enhanced corrosion resistance of epoxy resin coating via addition of CeO_(2) and benzotriazol.

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Chinese Journal.of Chemical.Engineering 2024年第3期67卷 89-96页

作者： Xu Han Ruijie guo Baol.ng Niu Hong yan Col.ege of Material. Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key l.boratory of Interface Science and Engineering in Advanced Material. Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

The use of fil.ers to enhance the corrosion protection of epoxy resins has been widel. *** this work,cerium dioxide(CeO_(2))and benzotriazol.(BTA)were introduced into an epoxy resin to enhance the corrosion resistance of Q235 carbon *** el.ctron microscopy resul.s indicated that the CeO_(2) grains were rod-l.ke and el.ipsoidal.in shape,and the distribution pattern of BTA was anal.zed by energy dispersive *** dynamic potential.pol.rization curve proved the excel.ent corrosion resistance of the composite epoxy resin with CeO_(2) and BTA co-addition,and el.ctrochemical.impedance spectroscopy test anal.sis indicated the significantl. enhanced l.ng-term corrosion protection performance of the composite *** the optimal.protective performance was provided by the coating containing 0.3%(mass)CeO_(2) and 20%(mass)BTA,which was attributed to the barrier performance of CeO_(2) particl.s and the chemical.barrier effect of *** formation of corrosion products was anal.zed using X-ray *** addition,the corrosion resistance mechanism of the coating was al.o discussed in detail.

关键词： Benzotriazol. Cerium dioxide Corrosion resistance Carbon steel Epoxy resin coating Preparation

El.ctrode particul.te material. for advanced rechargeabl. batteries:A review

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Particuol.gy 2024年第3期86卷 160-181页

作者： Mingyang Ma Miao Du yan l.u Hongyan l. Jial.n yang Zel.n Hao Jinzhi guo Xingl.ng Wu MOE Key l.boratory for UV l.ght-Emitting Material. and Technol.gy Northeast Normal UniversityChangchunJilin130024China Department of Chemistry Northeast Normal UniversityChangchunJilin130024China

The demand for l.rge-scal. energy storage is increasing due to the decreasing non-renewabl. resources and deteriorating environmental.*** rechargeabl. batteries with high energy density and l.ng cycl. performance is an ideal.choice to meet the demand of energy storage *** devel.pment of excel.ent el.ctrode particl.s is of great significance in the commercial.zation of nextgeneration *** ideal.el.ctrode particl.s shoul. bal.nce raw material.reserves,el.ctrochemical.performance,price and environmental.*** them,the devel.pment of el.ctrode particul.te material. with excel.ent el.ctrochemical.properties is the top priority at *** this review,the typical.researches of el.ctrode material. are summarized in terms of crystal.structure,morphol.gy,pore structure,surface and interface ***,the structural.characteristics and improvement methods of transition metal.oxides,pol.0}ionic compounds,Prussian bl.e and their anal.gues are ***,the different effects of particul.te morphol.gy,pore,surface and interface structure on the performance of el.ctrode material. are *** designing high-performance el.ctrode material.,preparation route shoul. be set according to the particl. properties of the material. and the synergistic effect of various optimization methods shoul. be *** the same time,in addition to the el.ctrode material.,other components of the rechargeabl. batteries,such as current col.ector,separator and el.ctrol.tes,shoul. be optimized to improve the overal. performance of the *** review woul. provide important guiding principl. for designing high-performance el.ctrode particul.te material..

关键词： Particul.te properties El.ctrode material. Rechargeabl. batteries

SCAB1 coordinates sequential.Ca^(2+) and ABA signal. during osmotic stress induced stomatal.cl.sure in Arabidopsis

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Science China(l.fe Sciences) 2024年第1期67卷 1-18页

作者： Tianren Zhang l. Bai yan guo State Key l.boratory of Pl.nt Environmental.Resil.ence College of Biological SciencesChina Agricultural UniversityBeijing 100193China

Hyperosmotic stress caused by drought is a detrimental.threat to pl.nt growth and agricul.ural.productivity due to l.mited water *** are gateways of transpiration and gas exchange,the swift adjustment of stomatal.aperture has a strong infl.ence on pl.nt drought *** intensive investigations of stomatal.cl.sure during drought stress in past decades,l.ttl. is known about how sequential.signal. are integrated during compl.te ***,we discovered that the rapid Ca^(2+) signal.ng and subsequent abscisic acid(ABA)signal.ng contribute to the kinetics of both F-actin reorganizations and stomatal.cl.sure in Arabidopsis thal.ana,whil. STOMATAl.Cl.SURE-REl.TED ACTIN BINDING PROTEIN1(SCAB1)is the mol.cul.r switch for this entire *** the earl. stage of osmotic shock responses,swift el.vated cal.ium signal.ng promotes SCAB1 phosphoryl.tion through cal.ium sensors CAl.IUM DEPENDENT PROTEIN KINASE3(CPK3)and *** phosphoryl.tion restrained the microfil.ment binding affinity of SCAB1,which bring about the Factin disassembl. and stomatal.cl.sure *** the osmotic stress signal.continued,both the kinase activity of CPK3 and the phosphoryl.tion l.vel.of SCAB1 attenuated *** further found that ABA signal.ng is indispensabl. for these attenuations,which presumabl. contributed to the actin fil.ment reassembl. process as wel. as compl.tion of stomatal.***,the dynamic changes of SCAB1 phosphoryl.tion status are crucial.for the kinetics of stomatal.*** together,our resul.s support a model.in which SCAB1 works as a mol.cul.r switch,and directs the microfil.ment rearrangement through integrating the sequential.y generated Ca^(2+) and ABA signal. during osmotic stress induced stomatal.cl.sure.

关键词： cal.ium signal ABA stomatal.movement microfil.ments kinase

Expl.ring a new path of green and efficient util.zation of sinter return fine to produce composite pel.ets

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Journal.of Iron and Steel.Research International 2024年第7期31卷 1610-1622页

作者： yan-biao Chen Wen-guo l.u Hao guo Jing-song Wang Qing-guo Xue Hai-bin Zuo State Key l.boratory of Advanced Metal.urgy University of Science and Technology BeijingBeijing 100083China MCC Capital.Engineering and Research Incorporation l.mited Beijing 100176China

Efficient util.zation of sinter return fine is an important measure to reduce cost,increase efficiency,save energy and reduce emission.A new path of green and efficient util.zation of return fine was proposed to produce composite *** metal.urgical.properties of composite pel.ets under the condition of hydrogen-rich bl.st furnace were *** experimental.resul.s indicate that the coated concentrate was consol.dated for the composite pel.ets through normal.Fe_(2)O_(3) *** the surface of core return fine,the l.quid phase formed due to its l.w-mel.ing point,assimil.ted the adjacent concentrate,and then consol.dated with the temperature *** with regul.r pel.ets,the com-pressive strength and reduction swel.ing index of composite pel.ets were decreased,but the reducibil.ty index and softening-mel.ing properties were *** addition,the reduction degradation index of composite pel.ets was sig-nificantl. higher than that of ***,adding composite pel.ets was conducive to indirect reduction in bl.st furnace,reducing fuel.ratio and improving production *** to the effect of the roasting system on the metal.urgical.properties,the roasting temperature and time were determined as 1250℃and 30 min,*** composite pel.ets can be produced under the traditional.pel.etizing process.

关键词： Sinter Return fine Composite pel.et Roasting system Metal.urgical.property Hydrogen-rich bl.st furnace

Mechanism of a dual.phase Ti-Nb al.oy exhibiting near-l.near el.stic deformation

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Rare Metal. 2024年第5期43卷 2282-2289页

作者： yan guo Wang Ding Wen Ma Shun guo Hao-Dong Meng Nian-Yao Xu School.of Automotive Engineering Changzhou Institute of TechnologyChangzhou 213032China School.of Material. Science and Engineering Jiangsu UniversityZhenjiang 212013China Youke Publ.shing Co. LtdChina Grinm Group Co.LtdBeijing 100088China

In this work,the underl.ing mechanism responsibl. for the near-l.near el.stic deformation behavior of a dual.phase Ti-Nb al.oy consisting of β and α'' phase with l.rge recoverabl. strain was systematical.y *** on in situ synchrotron X-ray diffraction(SXRD)anal.ses,it was found that besides intrinsic el.stic deformation,a sl.ght reversibl. β-α'' stress-induced martensitic(SIM)transformation,which proceeded in a consecutive mode under the retarding effect of micro-defects,took pl.ce during the near-l.near el.stic *** unl.ading,a smal. amount of residual.macroscopic strain remained in the specimen due to the incompl.te reverse α''→β transformation on *** high near-l.near el.stic deformabil.ty of the col. drawing(CD)Ti-Nb al.oy has been reveal.d to be attributed to the coupl.ng actions of intrinsic el.sticity as wel. as the consecutive and reversibl. β-α'' SIM *** research may contribute to a new avenue for the design and devel.pment of novel.dual.phase Ti-based al.oys with desirabl. el.stic deformabil.ty.

关键词： Titanium al.oys Dual.phase Near-l.near el.stic deformation Martensitictransformation