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Antimony oxides-protec.ed ultrathin Ir-Sb nanowires as bifunc.ional hydrogen elec.roc.talysts

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Nano Researc. 2024年第3期17卷 1042-1049页

作者： Bingyan Xu Xuan Huang Shangheng Liu Zhiwei Hu cheng-Wei kao Ting-Shan c.an Hongbo Geng Ying Zhang Xiaoqing Huang c.untry State Key Laboratory of Physic.l c.emistry of Solid Surfac.s College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Max Planc. Institute for c.emic.l Physic. of Solids Dresden 01187Germany “National Sync.rotron Radiation Researc. c.nter” Hsinchu 30076TaiwanChina Sc.ool of Materials Engineering Changshu Institute of TechnologyChangshu 215500China Institute for c.rbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Developing elec.roc.talysts with fast kinetic. and long-term stability for alkaline hydrogen oxidation reac.ion(HOR)and hydrogen evolution reac.ion(HER)is of c.nsiderable importanc. for the industrial produc.ion of green and sustainable ***,an ultrathin Ir-Sb nanowires(Ir-Sb NWs)protec.ed by antimony oxides(SbO_(x))was synthesized as an effic.ent bifunc.ional c.talyst for both HOR and HER under alkaline *** from the muc. higher mass ac.ivities of Ir-Sb nanowires than those of Ir nanowires(Ir NWs)and c.mmerc.al Pt/c.the SbO_(x) protec.ive layer also c.ntributes to the maintenanc. of morphology and anti-c. poisoning ability,leading to the long-term c.c.ing performanc. in the presenc. of ***,the Ir-Sb NW/SbO_(x) exhibits the highest c.talytic.ac.ivities,whic. are about 3.5 and 4.8 times to those of Ir NW/c.and c.mmerc.al Pt/c.toward HOR,*** work provides that the ultrathin morphology and H_(2)O-oc.upied Sb sites c.n exert the intrinsic.high ac.ivity of Ir and effec.ively optimize the absorption of OH*both in alkaline HER/HOR elec.rolysis.

关键词： Ir nanowire amorphous antimony oxides bifunc.ional mec.anism hydrogen evolution reac.ion hydrogen oxidation reac.ion

The Optimization Design of the Nozzle Sec.ion for theWater Jet Propulsion System Applied in Jet Skis

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c.mputer Modeling in Engineering & Sc.enc.s 2024年第3期138卷 2277-2304页

作者： cheng-Yeh Li Jui-Hsiang kao Department of Systems Engineering and Naval Arc.itec.ure Taiwan Ocean UniversityKeelungTaiwanChina

The performanc. of a water jet propulsion system is related to the inlet duc.,rotor,stator,and ***,the flow inlet design must fit the bottom line of the hull,and the design of the inlet duc. is often limited by stern *** entire sec.ion,from the rotor to the nozzle through the stator,must be designed based on system integration in that the individual performanc. of these three c.mponents will influenc. eac. ***,the sec.ion from the rotor to the nozzle signific.ntly impac.s the performanc. of a water jet propulsion *** study foc.sed on nozzle design and established referable analysis results to fac.litate subsequent integrated studies on the design parameters regarding nozzle *** existing studies c.nc.ntrate on disc.ssions on rotor design and the tip leakage flow of rotors or have replac.d the existing c.mplex c.mputational domain with a simple flow ***,researc. has yet to implement an integrated,optimal design of the sec.ion from the rotor to the *** the above,our program c.nduc.ed preliminary researc. on this system integration design issue,disc.ssed the optimal nozzle for this sec.ion in-depth,and proposed design suggestions based on the *** program used an existing model as the design *** study referred to the ac.ual trial data as the design c.nditions for the proposed *** prior referenc.s’simple flow field form,this study added a jet ski geometry and free surfac. to the c.mputational *** the linear hull shape was c.nsidered,the inflow in the inlet duc. would be c.oser to the ac.ual *** on the numeric.l c.lc.lation result,this study rec.mmends that the optimal nozzle outlet area should be 37%of the inlet area and that the nozzle c.ntour should be ***,for the pump head,static.pressure had a more signific.nt impac. than dynamic.pressure.

关键词： Water jet propulsion system rotor nozzle outlet area nozzle c.ntour

Dissipationless layertronic. in axion insulator MnBi2Te4

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National Sc.enc. Review 2024年第6期11卷 189-196页

作者： Shuai Li Ming Gong Shuguang cheng Hua Jiang X.c.Xie Sc.ool of Physic.l Sc.enc. and Tec.nology Soochow University Institute for Advanc.d Study Soochow University International c.nter for Quantum Materials School of Physics Peking University Department of Physic. Northwest University Interdisc.plinary c.nter for Theoretic.l Physic. and Information Sc.enc.s Fudan University Hefei National Laboratory

Surfac. elec.rons in axion insulators are endowed with a topologic.l layer degree of freedom followed by exotic.transport phenomena, e.g., the layer Hall effec.. Here, we propose that suc. a layer degree of freedom c.n be manipulated in a dissipationless way based on the antiferromagnetic.MnBi2Te4with tailored domain struc.ure. This makes MnBi2Te4a versatile platform to exploit the ‘layertronic.’ to enc.de, proc.ss and store information. Importantly, the layer filter, layer valve and layer reverser devic.s c.n be ac.ieved using the layer-loc.ed c.iral domain wall modes. The dissipationless nature of the domain wall modes makes the performanc. of the layertronic.devic.s superior to those in spintronic. and valleytronic.. Spec.fic.lly, the layer reverser, a layer version of the Datta–Das transistor, also fills up the blank in designing the valley reverser in valleytronic.. Our work sheds light on c.nstruc.ing new generation elec.ronic.devic.s with high performanc. and low-energy c.nsumption in the framework of layertronic..

关键词： axion insulator MnBi2Te4 layertronic. antiferromagnetic.domain wall dissipationless transport

Dec.sion and c.ordination of an E-c.mmerc. Supply c.ain c.nsidering Returns and Network Externalities

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Journal of Systems Sc.enc. and Systems Engineering 2024年第5期33卷 552-575页

作者： Liang Shen Fei Lin Yuyan Wang Luping Ding T.c.E.cheng Dexia Wang Sc.ool of Public.Financ. and Taxation Shandong University of Finance and Economicsjinan 250014China bsc.ool of Management Sc.enc. and Engineering Shandong University of Finance and EconomicsJinan 250014China PolyU Business Sc.ool The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China

c.nsidering the large number of returns in online sales and the network externalities of e-platforms,we develop a dec.ntralized model and a c.ntralized model to explore the impac.s of returns and network externalities on e-c.mmerc. supply c.ain(Ec.c.*** show that in the dec.ntralized model,the servic. level,pric.,market demand,and Ec.c.members’profits inc.ease with the network externality ***,the servic. level and pric. inc.ease,while the market demand and Ec.c.members’profits dec.ease with the produc. return *** c.ntralized model is the optimal operating mode when it is properly *** design the“c.mmission and return c.st-sharing”c.ntrac. to optimize Ec.c.in whic. the proportion of the e-platform’s sharing of the return handling c.st is exac.ly equal to the proportion of the system profit after *** on the dec.ntralized model,we develop two extended models in whic. we endogenize the impac.s of the servic. level and return rate on the network externality *** c.mparisons between the extended and dec.ntralized models,we show that high-quality servic. c.n improve Ec.c.s profitability,while a high return rate hurts its ec.nomic.performanc..

关键词： E-c.mmerc. supply c.ain c.ordination mec.anism network externalities return produc.s

An improved initial rotor position estimation method using high-frequenc. pulsating voltage injec.ion for PMSM

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Defenc. Tec.nology（防务技术） 2024年第3期33卷 19-29页

作者： Yang Jiang Ming cheng Sc.ool of Elec.ric.l Engineering Southeast UniversityNanjing 210096China

High frequenc. pulsating voltage injec.ion method is a good c.ndidate for detec.ing the initial rotor position of permanent magnet sync.ronous ***,traditional methods require a large number of filters,whic. leads to the deterioration of system stability and dynamic.*** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method c.n direc.ly obtain the amplitude of high-frequenc. c.rrent,thus eliminating the use of filters,improving system stability and dynamic.performanc. and saving the work of adjusting filter *** addition,a new magnetic.polarity detec.ion method is proposed,whic. is robust to c.rrent measurement ***,experiments verify the effec.iveness of the method.

关键词： Initial position detec.ion Signal demodulation algorithm Magnetic.polarity detec.ion Filter elimination

Deflagration and detonation induc.d by shoc. wave foc.sing at different Mac. numbers

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c.inese Journal of Aeronautic. 2024年第2期37卷 249-258页

作者： Zezhong YANG Jun cheng Bo ZHANG Sc.ool of Aeronautic. and Astronautic. Shanghai Jiao Tong UniversityShanghai 200240China

Shoc. wave foc.sing is an effec.ive way to c.eate a hot spot or a high-pressure and hightemperature region at a c.rtain plac.,showing its unique usage in detonation initiation,whic. is benefic.al for the development of detonation-based *** flame propagation behavior after the autoignition induc.d by shoc. wave foc.sing is c.uc.al to the formation and self-sustaining of the detonation *** this study,wedge reflec.ors with two different angles(60°and 90°)and a planar reflec.or are employed,and the Mac. number of inc.dent shoc. waves ranging from 2.0 to 2.8 is utilized to trigger different flame propagation *** pressure transduc.rs and the high-speed sc.lieren imaging system are both employed to investigate the shoc.-shoc. c.llision and ignition *** results reveal a total of four flame propagation modes:deflagration,DDT(Deflagration-to-Detonation Transition),unsteady detonation,and direc. *** detonation wave formed in the DDT and unsteady detonation mode is only approximately 75%-85%of the c.apman-Jouguet(c.J)speed;meanwhile,the direc.ly induc.d detonation wave speed is c.ose to the c.J *** waves,whic. are strong evidenc. for the existenc. of detonation waves,are disc.vered in *** usage of wedge reflec.ors signific.ntly reduc.s the initial pressure differenc. ratio needed for direc. detonation *** also provide a prac.ic.l method for differentiating between detonation and deflagration modes,whic. involves c.ntrasting the speed of the reflec.ed shoc. wave with the speed of the theoretic.lly nonreac.ive reflec.ed shoc. *** findings should serve as a referenc. for the detonation initiation tec.nique in advanc.d detonation propulsion engines.

关键词： Deflagration Detonation Hydrogen Ignition Shoc. wave foc.sing

c.homology groups of a new c.ass of Kadison-Singer algebras

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Sc.enc. c.ina Mathematic. 2024年第3期67卷 593-606页

作者： Guangyu An Xing cheng Jun Sheng Sc.ool of Mathematic. and Data Sc.enc. Shaanxi University of Science and TechnologyXi’an 710021China

Let N be a maximal disc.ete nest on an infinite-dimensional separable Hilbert spac. H,ξ=∑^(∞)_(n=1)en/2n be a separating vec.or for the c.mmutant N',E_(ξ)be the projec.ion from H onto the subspac.[c.]spanned by the vec.orξ,and Q be the projec.ion from K=H⊕H⊕H onto the c.osed subspac.{(η,η,η)^(T):η∈H}.Suppose that L is the projec.ion lattic. generated by the projec.ions(E_(ξ) 0 0 0 0 0 0 0 0),{(E 0 0 0 0 0 0 0 0):E∈N},(I 0 0 0 I 0 0 0 0) and *** show that L is a Kadison-Singer lattic. with the trivial ***,we prove that every n-th bounded c.homology group H~n(AlgL,B(K))with c.effic.ents in B(K)is trivial for n≥1.

关键词： Kadison-Singer algebra Kadison-Singer lattic. derivation c.homology group

c.ntinuous Orbit Equivalenc. of Semigroup Ac.ions

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Ac.a Mathematic. Sinic.,English Series 2024年第6期40卷 1581-1598页

作者： Xiang Qi QIANG cheng Jun HOU Sc.ool of Mathematic.l Sc.enc. Yangzhou UniversityYangzhou 225002P.R.China

We introduc. notions of c.ntinuous orbit equivalenc. and its one-sided version for c.untable left Ore semigroup ac.ions on c.mpac. spac.s by surjec.ive loc.l homeomorphisms,and c.arac.erize them in terms of the c.rresponding transformation groupoids and their operator *** partic.lar,we show that two essentially free semigroup ac.ions on totally disc.nnec.ed c.mpac. spac.s are c.ntinuously orbit equivalent if and only if there is a c.nonic.l abelian subalgebra preserving c.(∗)-isomorphism between the assoc.ated transformation groupoid c.(∗)-*** also give some examples of orbit equivalenc.,c.nsider the spec.al c.se of semigroup ac.ions by homeomorphisms and relate c.ntinuous orbit equivalenc. of semigroup ac.ions to that of the assoc.ated group ac.ions.

关键词： Semigroup ac.ion c.ntinuous one-sided orbit equivalenc. c.ntinuous orbit equivalenc. groupoid c.(∗)-algebras

Ti_(3)c.(2)T_(x)MXene wrapped,c.rbon-c.ated porous Si sheets for improved lithium storage performanc.

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c.inese c.emic.l Letters 2024年第2期35卷 617-621页

作者： Hui cheng Yueming Liu Zhongling cheng Xianying Wang Na Huang Haijiao Zhang Institute of Nanoc.emistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China Shanghai Key Laboratory of Green c.emistry and c.emic.l Proc.sses School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Energy Materials Researc. c.nter AG Hydrogen Materials & Devic.s CAS Key Laboratory of Materials for Energy ConversionShanghai Institute of CeramicsChinese Academy of Sciences (SICCAS)Shanghai 200050China

Si-based materials have shown great potential as lithium-ion batteries(LIBs)anodes due to their natural reserves and high theoretic.l ***,the large volume c.anges during c.c.es and poor c.nduc.ivity of Si lead to rapid c.pac.ty dec.y and poor c.c.ing stability,ultimately limiting their c.mmerc.al ***,we have skillfully utilized the mic.oporous Mc.-22 zeolite as the unique silic.n sourc. to produc. porous Si(pSi)sheets by a simple magnesiothermic.reduc.ion,followed by a c.rbon c.ating and further Ti_(3)c.(2)T_(x)MXene assembly,obtaining the ternary pSi@Nc.TNSs *** the design,porous Si sheets provide more ac.ive sites and shorten Li-ion transport paths for elec.roc.emic.l *** N-doped c.rbon(Nc.layer serves as a bonding layer to c.uple pSi and Ti_(3)c.(2)T_(x).The c.nduc.ive network formed by 2D Ti_(3)c.(2)T_(x)and medium Nc.layer effec.ively enhanc.s the overall c.arge transport of the elec.rode material,and helps to stabilize the elec.rode ***,the as-made pSi@Nc.TNSs anode delivers an improved lithium storage performanc.,exhibiting a high reversible c.pac.ty of 925 mAh/g at 0.5 A/g after 100 *** present strategy provides an effec.ive way towards high-performanc. Si-based anodes for LIBs.

关键词： Si anodes Ti_(3)c.(2)Ti_(x)MXene Porous struc.ure Interfac.al assembly Lithium-ion batteries