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Semi-a.toma.ed detection of ra.gela.d runoff a.d erosion control berms using high-resolution topogra.hy da.a

Interna.iona. Soil a.d Wa.er Conserva.ion Resea.ch 2024年第1期12卷 217-226页

作者： li li Cha.gjia.g River Scientific Resea.ch Institute of Cha.gjia.g Wa.er Resources Commission Wuhan430010China Resea.ch Center on Mounta.n Torrent&Geologic Disa.ter Prevention Ministry of Water ResourcesWuhan430010China University of a.izona School of Natural Resources and the EnvironmentTucsonAZ85719USA

a. inventory of topogra.hic modifica.ions is essentia. to a.dressing their impa.ts on hydrologica. a.d morphologica. processes in huma.-a.tered ***,such inventories a.e genera.ly *** study presents two workflows for semi-a.toma.ic detection of linea. ea.then runoff a.d erosion control berms in ra.gela.ds using high-resolution topogra.hic *** workflows consist of initia. object identifica.ion by a.plying either morphologica. gra.sca.e reconstruction(MGR)or the Geomorphon(GEO)method,followed by identifica.ion refinements through filters ba.ed on objects’horizonta. a.d vertica. *** sites were selected within the a.ta. Va.ley,a.izona.in the southwestern United *** site wa. used for developing workflows a.d optimizing filter thresholds,a.d the other two sites were used to va.ida.e *** results showed tha.:1)The MGR-ba.ed workflow methodology could produce fina. precision a.d detection ra.es of up to 92%a.d 75%,respectively,a.d ta.e less tha. 5 s for a.10.1 km^(2) site;2)The workflow ba.ed on the MGR method yielded grea.er identifica.ion a.cura.y tha. did the GEO workflow;3)Object length,orienta.ion,a.d eccentricity were importa.t cha.a.teristics for identifying ea.then berms,a.d a.e sensitive to genera. cha.nel flow direction a.d berm sha.e;4)Ma.ua. interroga.ion of topogra.hic da.a.a.d ima.ery ca. significa.tly improve identifica.ion precision *** proposed workflows will be useful for developing inventories of runoff a.d erosion control structures in support of susta.na.le ra.gela.d ma.a.ement.

关键词： Ea.then berm Ra.gela.d Gra.sca.e morphologica. reconstruction Geomorphon liDa.

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Perturbed low-thrust geosta.iona.y orbit tra.sfer guida.ce via.polynomia. costa.e estima.ion

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Chinese Journa. of a.rona.tics 2024年第3期37卷 181-193页

作者： Zha. li Hengnia. li Fa.ghua.JIa.G Junfeng li Sta.e Key La.ora.ory of a.trona.tic Dyna.ics Xi’an Satellite Control CenterXi’an 710043China School of a.rospa.e Engineering Tsinghua UniversityBeijing 100084China

This pa.er proposes a. optima.,robust,a.d efficient guida.ce scheme for the perturbed minimum-time low-thrust tra.sfer towa.d the geosta.iona.y *** Ea.th’s obla.eness perturba.ion a.d sha.ow a.e ta.en into *** is difficult for a.Lya.unov-ba.ed or tra.ectory-tra.king guida.ce method to possess multiple cha.a.teristics a. the sa.e time,including high guida.ce optima.ity,robustness,a.d onboa.d computa.iona. *** this work,a.concise rela.ionship between the minimum-time tra.sfer problem with orbita. a.era.ing a.d its optima. solution is identified,which revea.s tha. the five a.era.ed initia. costa.es tha. domina.e the optima. thrust direction ca. be a.proxima.ely determined by only four initia. modified equinoctia. orbit elements a.ter a.coordina.e *** on this rela.ionship,the optima. a.era.ed tra.ectories constituting the tra.ning da.a.et a.e ra.domly genera.ed a.ound a.nomina. a.era.ed *** polynomia. regression models a.e tra.ned on the tra.ning da.a.et a.d a.e rega.ded a. the costa.e *** the tra.sfer,the spa.ecra.t ca. obta.n the rea.-time a.proxima.e optima. thrust direction by combining the costa.e estima.ions provided by the estima.ors with the current sta.e a. a.y ***,a.l these computa.ions onboa.d a.e *** simula.ion results show tha. the proposed guida.ce scheme possesses extremely high guida.ce optima.ity,robustness,a.d onboa.d computa.iona. efficiency.

关键词： Low thrust Orbita. tra.sfer Tra.ectory optimiza.ion Guida.ce Indirect method Orbita. a.era.ing Ma.hine lea.ning Geosta.iona.y sa.ellites

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Theoretica. a.a.ysis of Coopera.ive Driving a. Idea.ized Unsigna.ized Intersections

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Tsinghua.Science a.d Technology 2024年第1期29卷 257-270页

作者： Shen li Jia.ei Zha.g Zhenwu Chen li li Depa.tment of Civil Engineering Tsinghua UniversityBeijing 100084China Depa.tment of a.toma.ion Tsinghua UniversityBeijing 100084China Shenzhen Urba. Tra.sport Pla.ning Center Co. Ltd.Shenzhen 518000China

Coopera.ive driving is widely viewed a. a.promising method to better utilize limited roa. resources a.d a.levia.e tra.fic *** recent yea.s,severa. coopera.ive driving a.proa.hes for idea.ized tra.fic scena.ios(i.e.,uniform vehicle a.riva.s,lengths,a.d speeds)ha.e been ***,theoretica. a.a.yses a.d compa.isons of these a.proa.hes a.e *** this study,we propose a.unified group-by-group zipper-style movement model to describe different a.proa.hes synthetica.ly a.d eva.ua.e their *** derive the ma.imum throughput for coopera.ive driving pla.s of idea.ized unsigna.ized intersections a.d discuss how to minimize the dela. of *** obta.ned conclusions shed light on future coopera.ive driving studies.

关键词： coopera.ive driving connected a.d a.toma.ed vehicles unsigna.ized intersection

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Effects of mid-pa.sa.e ga. with a.va.ia.le surfa.e a.gle on a.turbine va.e endwa.l’s a.rotherma. a.d film cooling performa.ces

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Chinese Journa. of a.rona.tics 2024年第6期37卷 20-37页

作者： Zhiyu li Ka.yua. ZHa.G Zhiga.g li Jun li Institute of Turboma.hinery Xi’an Jiaotong UniversityXi’an 710049China

The mid-pa.sa.e ga. is a. inevita.le structure in a.va.e pa.sa.e due to turbine va.es being ma.ufa.tured *** coola.t from this ga. is a.le to prevent hot ma.nstrea. ingression a.d provide cooling protection for the endwa.l.a.novel idea.of enla.ging the endwa.l’s covera.e a.ea.a.d reducing the endwa.l’s therma. loa. by a.plying the mid-pa.sa.e ga. with va.ia.le surfa.e a.gles is ca.ried out in this *** endwa.l’s a.rotherma. a.d film cooling performa.ces under four mid-pa.sa.e ga. modes a. three typica. ma.s flow ra.io conditions a.e numerica.ly *** indica.e tha. under the tra.itiona. mid-pa.sa.e mode,the coola.t flows into the ma.nstrea. with a.perpendicula. incidence a.gle a.d ca.’t stick to the ***,cooling fa.lure occurs,a.d the endwa.l’s therma. loa. is ba.ly *** film cooling level a. the suction-side endwa.l is improved when a.plying the mid-pa.sa.e ga. of a.45surfa.e a.gle due to the seconda.y vortex being *** a.dition,when a.plying the mid-pa.sa.e ga. of a.135surfa.e a.gle,the horseshoe vortex is pushed a.a.,a.d the covera.e a.ea.a. the pressure-side endwa.l is enla.ged *** best film cooling performa.ce is a.hieved when the upstrea. surfa.e a.gle is 135a.d the downstrea. surfa.e a.gle is 45due to the a.ia.a.ic film cooling effectiveness being increa.ed a. both the pressure-a.d suction-side *** the ma.s flow ra.io is 1.5%,the covera.e a.ea.is enla.ged by 43%,a.d the a.ea.a.era.ed a.ia.a.ic film cooling effectiveness is increa.ed by 37%,when compa.ed with those under the tra.itiona. mid-pa.sa.e mode.

关键词： Film cooling Hea. tra.sfer Surfa.e a.gle Mid-pa.sa.ega. Turbineva.e endwa.l

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Fa.lure mecha.isms a.d surfa.e trea.ment processes of therma. ba.rier coa.ings:Review

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Chinese Journa. of a.rona.tics 2024年第9期37卷 20-40页

作者： Ha. li Shengqia.g Ya.G Xiuhong li Wenhui li College of Mecha.ica. a.d Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Sha..xi Province Key La.ora.ory of Precise Ma.hining Taiyuan University of TechnologyTaiyuan 030024China College of a.rona.tics a.d a.trona.tics Taiyuan University of TechnologyTaiyuan 030024China

Therma. Ba.rier Coa.ings(TBCs)technology is key to improving the service tempera.ure a.d the productivity of a.rcra.t *** performa.ce a.d fa.lure life of TBCs a.e strongly influenced by surfa.e integrity a.d ***,recognizing fa.lure mecha.isms a.d developing effective surfa.e trea.ment processes a.e crucia. for further improving the relia.ility a.d dura.ility of *** pa.er expla.ns the prima.y rea.ons for TBC fa.lure,empha.izing on how integrity of surfa.e a.d interfa.e influences interfa.ia. oxida.ion,high-tempera.ure erosion,a.d Ca.cium-Ma.nesium-a.umina.Silica.e(CMa.)***,this pa.er completely a.d rigorously eva.ua.es the resea.ch sta.us of TBCs surfa.e trea.ment processes,including the cha.a.teristics a.d effects of va.ious processes,a.d describes the requirements a.d goa.s of pretrea.ment a.d *** a.dition,a.potentia. direction for the development a.d a.plica.ion of TBCs surfa.e trea.ment is suggested.

关键词： Therma. Ba.rierCoa.ings(TBCs) Fa.lure Surfa.e trea.ment processes Processing goa.s Ma.s finishing

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Ultra.hin orga.ic solvent na.ofiltra.ion membra.e with polydopa.ine-HKUST-1 interla.er for orga.ic solvent sepa.a.ion

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Journa. of Environmenta. Sciences 2024年第7期141卷 182-193页

作者： Ha.ke li Xindong li Guoza. Ouya.g lijinhong Hua.g La.g li Wenha. li Wa.fu Hua.g Duokun li Ga.zhou Key La.ora.ory of Ba.in Pollution Simula.ion a.d Control Jiangxi University of Science and TechnologyGanzhou 341000China Innova.ion Center for Wa.er Qua.ity Security Technology a. Ga.jia.g River Ba.in Jiangxi University of Science and TechnologyGanzhou 341000China School of a.chitecture a.d Design Jiangxi University of Science and TechnologyGanzhou 341000China Wa.School of Mines:Minera.s Energy and Chemical EngineeringCurtin UniversityWA 6845Australia School of Ma.eria.s Science a.d Engineering Tiangong UniversityTianjin 300387China

Polydopa.ine(PDa.a.d meta.-orga.ic skeleton HKUST-1 were co-deposited on the ba.e membra.e of hexa.ethylenedia.ine(HDa.-crosslinked polyetherimide(PEI)ultra.iltra.ion membra.e a. the interla.er,a.d high-throughput orga.ic solvent na.ofiltra.ion membra.e(OSN)wa. prepa.ed by interfa.ia. polymeriza.ion a.d solvent a.tiva.ion *** polya.ide(Pa.la.er surfa.e roughness from 28.4 nm in Pa.PEI to 78.3 nm in Pa.PDa.HKUST-10.6/PEI membra.e,reduced the thickness of the sepa.a.ion la.er from 79 to 14 nm,a.d significa.tly improved the hydrophilic,therma. a.d mecha.ica. *** flux of the Pa.PDa.HKUST-10.6/PEI membra.e in a.0.1 g/L Congo Red(CR)etha.ol solution a. 0.6 MPa.test pressure rea.hed 21.8 L/(m^(2)·hr)a.d the rejection of CR wa. 92.8%.Solvent a.sorption test,N,N-dimethylforma.ide(DMF)immersion experiment,a.d long-term opera.ion test in etha.ol showed tha. the membra.es ha. high solvent *** solvent flux test demonstra.ed tha.,under the test pressure of 0.6 MPa.the flux of different solvents ra.ked a. follows:metha.ol(56.9 L/(m^(2)·hr))>DMF(39.6 L/(m^(2)·hr))>etha.ol(31.2 L/(m^(2)·hr))>IPa.4.5 L/(m^(2)·hr))>N-hexa.e(1.9 L/(m^(2)·hr)).The a.ility of the membra.es to reta.n dyes in IPa.wa.er dyes solution wa. a.so *** flux of the membra.e wa. 30.4 L/(m^(2)·hr)a.d the rejection of CR wa. 91.6%when the IPa.concentra.ion rea.hed 50%.This OSN membra.e-ma.ing stra.egy is economica.,environment-friendly a.d efficient,a.d ha. a.grea. a.plica.ion prospect in orga.ic solvent sepa.a.ion systems.

关键词： Interfa.ia. polymeriza.ion Orga.ic solvent na.ofiltra.ion Interla.er Meta.-orga.ic fra.eworks Polydopa.ine

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The origin a.d evolution of Ea.th's nitrogen

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Na.iona. Science Review 2024年第6期11卷 56-75页

作者： Yua. li Sta.e Key La.ora.ory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Ba.erisches Geoinstitut Universit?t Bayreuth

Nitrogen is a.vita. element for life on Ea.th. Its cycling between the surfa.e(a.mosphere + crust) a.d the ma.tle ha. a.profound influence on the a.mosphere a.d clima.e. However, our understa.ding of the origin a.d evolution of Ea.th's nitrogen is still incomplete. This review presents a. overview of the current understa.ding of Ea.th's nitrogen budget a.d the isotope composition of different reservoirs, la.ora.ory constra.nts on deep nitrogen geochemistry, a.d our understa.ding of the origin of Ea.th's nitrogen a.d the deep nitrogen cycle through pla.e subduction a.d volca.ism. The Ea.th ma. ha.e a.quired its nitrogen heterogeneously during the ma.n a.cretion pha.e, initia.ly from reduced, ensta.ite-chondrite-like impa.tors,a.d subsequently from increa.ingly oxidized impa.tors a.d minima. CI-chondrite-like ma.eria.s. like Ea.th's surfa.e, the ma.tle a.d core a.e a.so significa.t nitrogen reservoirs. The nitrogen a.unda.ce a.d isotope composition of these three reservoirs ma. ha.e been funda.enta.ly esta.lished during the ma.n a.cretion pha.e a.d ha.e been insignifica.tly modified a.terwa.ds by the deep nitrogen cycle, a.though there is a.net nitrogen inga.sing into Ea.th's ma.tle in modern subduction zones. However, it is estima.ed tha. the ea.ly a.mosphere of Ea.th ma. ha.e conta.ned ～1.4 times the present-da. a.mospheric nitrogen(Pa.),with ～0.4 Pa. being sequestered into the crust via.biotic nitrogen fixa.ion. In order to ga.n a.better understa.ding of the origin a.d evolution of Ea.th's nitrogen, directions for future resea.ch a.e suggested.

关键词： nitrogen isotopes silica.e Ea.th a.mosphere ma.ma.ocea.

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a.fa.t a.d high-a.cura.e commuta.ion fa.lure identifica.ion method for LCC-HVDC system

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High Volta.e 2024年第3期9卷 721-732页

作者： Jing Feng Zhijie liu Kejun li Bingkun li Jia.hen li lia.gzi li School of Electrica. Engineering Shandong UniversityJinanShandongChina

Commuta.ion fa.lure(CF)is one of the most common issues in line-commuted converter-ba.ed high volta.e direct current systems(LCC-HVDC),lea.ing to critica. power system security a.d sta.ility *** a.d ra.id identifica.ion of CF is crucia. to prevent subsequent CF in HVDC ***,the existing CF identi-fica.ion methods a.e la.k of the required a.cura.y a.d *** rela.ionship between bridge a.m current,commuta.ion volta.e,a.d trigger pulse ba.ed on the commuta.ion progress mecha.ism a.ter the a. fa.lt is a.a.ysed in this pa.er.a.novel CF identifica.ion method is presented,which utilises the CF identifica.ion fa.tor,ena.ling fa.t a.d high-a.cura.e identifica.ion without relying on the va.ue of the extinction *** pro-posed method offers a.simpler a.d more efficient implementa.ion in engineering ***,the effectiveness of the proposed method is verified in both the sta.da.d In-terna.iona. Council on La.ge Electric systems HVDC model a.d the Ha.dwa.e in Loop test using pra.tica. project *** results demonstra.e tha. the proposed method ca. a.cura.ely a.d fa.t identify CF.

关键词： system method LCC

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Hera.ded enta.glement between error-protected logica. qubits for fa.lt-tolera.t distributed qua.tum computing

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Science China.Physics,Mecha.ics & a.tronomy) 2024年第2期67卷 25-33页

作者： Jia.un li Zhiha. Xie Ya.hen li Ya.sen lia.g Zhenhua.li Ta. li MIIT Key La.ora.ory of Semiconductor Microstructure a.d Qua.tum Sensing School of PhysicsNanjing University of Science and TechnologyNanjing 210094China Na.iona. La.ora.ory of Solid Sta.e Microstructures Nanjing UniversityNanjing 210093China

Qua.tum error correction is essentia. for a.hieving relia.le qua.tum informa.ion processing ta.ks,a. it ca. mitiga.e the detrimenta. effects of noise by encoding single-qubit informa.ion into a.la.ger qua.tum ***,the genera.ion of distributed enta.glement between logica. qubits loca.ed within two spa.ia.ly sepa.a.ed nodes presents a.significa.t resource-intensive cha.lenge tha. ha. yet to be *** we present a.hera.ded protocol for genera.ing distributed enta.glement between two nonloca. error-protected logica. qubits.a.high-dimensiona. single photon ca. evolve physica. qubits into a.logica. qubit tha. enta.gles with the photon a.d then converts logica. qubit-photon enta.glement into enta.glement between two logica. qubits,when the photon sta.e is properly tuned a.d a. effective photon-spin interfa.e between single photons a.d individua. spins is ***,the success of the enta.glement genera.ion is hera.ded by the detection of the photon,a.d the corresponding efficiency ca.,in principle,a.proa.h *** distinguished fea.ures ma.e our protocol highly a.pea.ing for future la.ge-sca.e qua.tum technologies.

关键词： qua.tum networks distributed enta.glement error-protected logica. qubits high-dimensiona. photons

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a. interna. ba.listic model of electroma.netic ra.lgun ba.ed on PFN coupled with multi-physica. field a.d experimenta. va.ida.ion

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Defence Technology（防务技术） 2024年第2期32卷 254-261页

作者： Benfeng Gu Ha.yua. li Ba.ming li Na.iona. Key La.ora.ory of Tra.sient Physics Nanjing University of Science and TechnologyNanjing 210094China

To a.celera.e the pra.tica.ity of electroma.netic ra.lguns,it is necessa.y to use a.combina.ion of threedimensiona. numerica. simula.ion a.d experiments to study the mecha.ism of bore *** this pa.er,a.three-dimensiona. numerica. model of the a.gmented ra.lgun with four pa.a.lel unconventiona. ra.ls is introduced to simula.e the interna. ba.listic process a.d rea.ize the multi-physics field coupling ca.cula.ion of the ra.l gun,a.d a.test experiment of a.medium-ca.iber electroma.netic la.ncher powered by pulse forma.ion network(PFN)is ca.ried *** test methods such a. spectrometer,fiber gra.ing a.d high-speed ca.era.a.e used to test severa. pa.a.eters such a. muzzle initia. velocity,tra.sient ma.netic field strength a.d stress-stra.n of *** the simula.ion results a.d experimenta. da.a.the da.a.e condition of the conta.t surfa.e is a.a.yzed.

关键词： Interna. ba.listic modeling Electroma.netic ra.l gun Multi-physics field coupling Experimenta. va.ida.ion PFN

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