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The low Ma.h number limit of non-isentropic ma.netohydrodyna.ic equa.ions with la.ge tempera.ure va.ia.ions in bounded doma.ns

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Science China.Ma.hema.ics 2024年第4期67卷 787-818页

作者： Min Lia.g Ya.bin ou School of Ma.hema.ics Renmin University of ChinaBeijing 100872China

This pa.er verifies the low Ma.h number limit of the non-isentropic compressible ma.netohydrodyna.ic(MHD)equa.ions with or without the ma.netic diffusion in a.three-dimensiona. bounded doma.n when the tempera.ure va.ia.ion is la.ge but *** uniform estima.es of strong solutions a.e esta.lished in a.short time interva. independent of the Ma.h number,provided tha. the slip bounda.y condition for the velocity a.d the Neuma.n bounda.y condition for the tempera.ure a.e imposed a.d the initia. da.a.is well-prepa.ed.

关键词： low Ma.h number limit non-isentropic compressible ma.netohydrodyna.ic equa.ions la.ge tempera.ure va.ia.ions bounded doma.ns

High-throughput screening of single-a.om ca.a.ysts confined in monola.er bla.k.phosphorus for efficient nitrogen reduction rea.tion

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Na.o Resea.ch 2024年第4期17卷 2360-2367页

作者： Xia.-Ya. Li Ma.yi Dua. Pengfei ou Depa.tment of Electrica. a.d Computer Engineering University of TorontoTorontoOntario M5S 1A4Canada School of Physics a.d Electronic Engineering Sichuan Normal UniversityChengdu 610101China Depa.tment of Chemistry Northwestern UniversityEvanstonIL 60208USA

The discovery of meta.-nitrogen centers a. the a.tive sites for electrolysis ha. a.oused significa.t interest in utilizing single-a.om ca.a.ysts for nitrogen reduction rea.tion(NRR).Properly designed na.ostructured ca.a.ysts tha. strongly intera.t with nitrogen molecules(N_(2))ca. promote a.sorption a.d a.tiva.ion,thereby resulting in efficient ca.a.ysts with high sta.ility,a.tivity,a.d *** this study,using density functiona. theory ca.cula.ions,we selected monola.er bla.k.phosphorus(BP)a. the substra.e a.d screened a.series of single-a.om tra.sition meta.s confined in tri-coordina.ed a.d tetra.coordina.ed a.tive centers(without a.d with N dopa.ts)to electro-ca.a.yze *** a.result,we ha.e identified two promising ca.dida.es(Hf_(1)-N_(1)P_(2)-1 a.d Tc_(1)-N_(4)),which exhibit not only low overpotentia.s of 0.56 a.d 0.49 V but a.so high thermodyna.ic a.d electrochemica. sta.ility,a. well a. good selectivity towa.ds NRR over the competing hydrogen evolution *** a.so demonstra.e the a.ility of Hf_(1)-N_(1)P_(2)-1 a.d Tc_(1)-N_(4) to a.tiva.e a.d hydrogena.e N_(2) by dona.ing electrons a.d regula.ing cha.ge *** study not only predicts new BP-ba.ed promising ca.a.ysts but a.so provides guida.ce for the ra.iona. design of high-performa.ce NRR electroca.a.ysts under a.bient conditions.

关键词： N_(2) electroreduction rea.tion single-a.om ca.a.ysts bla.k.phosphorus density functiona. theory high-throughput ca.cula.ions

Block.Ba.is for Modula. Coinva.ia.ts of Pseudo-Reflection Groups

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a.gebra.Colloquium 2024年第1期31卷 41-48页

作者： k. ou School of Sta.istics a.d Ma.hema.ics Yunna. University of Fina.ce a.d Economics Kunming 650221China

We investiga.e the block.ba.is for modula. coinva.ia.ts of finite pseudo-reflection *** a.e pa.ticula.ly interested in the ca.e of a.subgroup G of the pa.a.olic subgroups of GLn(q)which genera.izes the Weyl groups of ... 详细信息

关键词： modula. inva.ia.t theory pseudo-reflection group block.ba.is coinva.ia.t

Development of a.convolutiona. neura. network.ba.ed geomecha.ica. upsca.ing technique for heterogeneous geologica. reservoir

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Journa. of Rock.Mecha.ics a.d Geotechnica. Engineering 2024年第6期16卷 2111-2125页

作者： Zhiwei Ma.Xia.ya. ou Bo Zha.g Ea.th a.d Environmenta. Sciences Division Los Alamos National LaboratoryLos AlamosUSA Civil a.d Environmenta. Engineering University of AlbertaEdmontonCanada

Geomecha.ica. a.sessment using coupled reservoir-geomecha.ica. simula.ion is becoming increa.ingly importa.t for a.a.yzing the potentia. geomecha.ica. risk. in subsurfa.e geologica. ***,a.robust a.d efficient geomecha.ica. upsca.ing technique for heterogeneous geologica. reservoirs is la.k.ng to a.va.ce the a.plica.ions of three-dimensiona.(3D)reservoir-sca.e geomecha.ica. simula.ion considering deta.led geologica. ***,we develop convolutiona. neura. network.CNN)proxies tha. reproduce the a.isotropic nonlinea. geomecha.ica. response ca.sed by lithologica. heterogeneity,a.d compute upsca.ed geomecha.ica. properties from CNN *** CNN proxies a.e tra.ned using a.la.ge da.a.et of ra.domly genera.ed spa.ia.ly correla.ed sa.d-sha.e rea.iza.ions a. inputs a.d simula.ion results of their ma.roscopic geomecha.ica. response a. *** tra.ned CNN models ca. provide the upsca.ed shea. strength(R^(2)>0.949),stress-stra.n beha.ior(R^(2)>0.925),a.d volumetric stra.n cha.ges(R^(2)>0.958)tha. highly a.ree with the numerica. simula.ion results while sa.ing over two orders of ma.nitude of computa.iona. *** is a.ma.or a.va.ta.e in computing the upsca.ed geomecha.ica. properties directly from geologica. rea.iza.ions without the need to perform loca. numerica. simula.ions to obta.n the geomecha.ica. *** proposed CNN proxyba.ed upsca.ing technique ha. the a.ility to(1)bridge the ga. between the fine-sca.e geocellula. models considering geologica. uncerta.nties a.d computa.iona.ly efficient geomecha.ica. models used to a.sess the geomecha.ica. risk. of la.ge-sca.e subsurfa.e development,a.d(2)improve the efficiency of numerica. upsca.ing techniques tha. rely on loca. numerica. simula.ions,lea.ing to significa.tly increa.ed computa.iona. time for uncerta.nty qua.tifica.ion using numerous geologica. rea.iza.ions.

关键词： Upsca.ing Lithologica. heterogeneity Convolutiona. neura. network.CNN) a.isotropic shea. strength Nonlinea. stressestra.n beha.ior

Pixel-level cra.k.segmenta.ion of tunnel lining segments ba.ed on a. encoder–decoder network

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Frontiers of Structura. a.d Civil Engineering 2024年第5期18卷 681-698页

作者： Sha.k.0}g Hou Zhiga.g ou Yuequn HUa.G Ya.ru LIU Sta.e k.y La.ora.ory of Hydroscience a.d Engineering Tsinghua UniversityBeijing 100084China China.Renewa.le Energy Engineering Institute Beijing 100120China Sta.e k.y La.ora.ory of Stimula.ion a.d Regula.ion of Wa.er Cycles in River Ba.ins China Institute of Water Resources and Hydropower ResearchBeijing 100038China Huna. Provincia. Wa.er Resources Development&Investment Co. Ltd.Changsha 410007China

Regula. detection a.d repa.r for lining cra.k. a.e necessa.y to gua.a.tee the sa.ety a.d sta.ility of *** development of computer vision ha. grea.ly promoted structura. hea.th *** study proposes a.novel encoder–decoder structure,Cra.k.ecNet,for sema.tic segmenta.ion of lining segment cra.k. by integra.ing improved VGG-19 into the U-Net *** ima.e a.quisition equipment is designed ba.ed on a.ca.era.3-dimensiona. printing(3DP)bra.k.t a.d two la.er ra.gefinders.a.tunnel concrete structure cra.k.TCSC)ima.e da.a.set,conta.ning ima.es collected from a.double-shield tunnel boring ma.hines(TBM)tunnel in China.wa. *** da.a.preprocessing opera.ions,such a. brightness a.justment,pixel resolution a.justment,flipping,splitting a.d a.nota.ion,2880 ima.e sa.ples with pixel resolution of 448×448 were *** model wa. implemented by Pytorch in PyCha.m processed with 4 NVIDIa.TITa. V *** the experiments,the proposed Cra.k.ecNet showed better prediction performa.ce tha. U-Net,Terna.sNet,a.d *** pa.er a.so discusses GPU pa.a.lel a.celera.ion effect a.d the cra.k.ma.imum width qua.tifica.ion.

关键词： tunnel lining segment cra.k.detection sema.tic segmenta.ion convolutiona. neura. network encoder-decoder structure

Enta.gled photons ena.led ultra.a.t stimula.ed Ra.a. spectroscopy for molecula. dyna.ics

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Light(Science & a.plica.ions) 2024年第8期13卷 1615-1622页

作者： Jia.a. Joel Fa. Zhe-Yu ou Zhedong Zha.g Depa.tment of Physics City University of Hong KongKowloonHong Kong SARChina City University of Hong k.ng Shenzhen Research InstituteShenzhenGuangdongChina

Qua.tum enta.glement ha. emerged a. a.grea. resource for studying the intera.tions between molecules a.d *** propose a.new scheme of stimula.ed Ra.a. sca.tering with enta.gled photons.a.qua.tum ultra.a.t Ra.a. spectroscopy is developed for condensed-pha.e molecules,to monitor the exciton popula.ions a.d *** results a.e obta.ned,showing a. enta.glement-ena.led time-frequency sca.e not a.ta.na.le by cla.sica. *** Ra.a. signa. presents a. unprecedented selectivity of molecula. correla.ion functions,a. a.result of the Hong-ou-Ma.del *** work.suggests a.new pa.a.igm of using a. unconventiona. interferometer a. pa.t of spectroscopy,with the potentia. to unveil a.va.ced informa.ion a.out complex ma.eria.s.

关键词： ma.eria.s spectroscopy selectivity

Side-Cha.nel Lea.a.e a.a.ysis of Inner Product Ma.k.ng

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Computers, Ma.eria.s & Continua 2024年第4期79卷 1245-1262页

作者： Yuyua. Li La.g Li Yu ou College of Computer Science a.d Technology Hengyang Normal UniversityHengyang421002China Huna. Provincia. k.y La.ora.ory of Intelligent Informa.ion Processing a.d a.plica.ion Hengyang Normal UniversityHengyang421002China

The Inner Product Ma.k.ng(IPM)scheme ha. been shown to provide higher theoretica. security gua.a.tees tha. the Boolea.Ma.k.ng(BM).This scheme a.ms to increa.e the a.gebra.c complexity of the coding to a.hieve a.higher level of *** previous work.unfolds when certa.n(a.versa.ia. a.d implementa.ion)conditions a.e met,a.d we seek.to complement these investiga.ions by understa.ding wha. ha.pens when these conditions devia.e from their expected *** this pa.er,we investiga.e the security cha.a.teristics of IPM under different *** a.versa.ia. condition,the security properties of first-order IPMs obta.ned through pa.a.etric cha.a.teriza.ion a.e preserved in the fa.e of univa.ia.e a.d biva.ia.e *** implementa.ion condition,we construct two new polynomia. lea.a.e functions to observe the nonlinea. lea.a.e of the IPM a.d connect the security order a.plifica.ion to the nonlinea. *** observe tha. the security of IPMis a.fected by the degree a.d the linea. component in the lea.a.e *** a.dition,the compa.ison experiments from the coefficients,signa.-to-noise ra.io(SNR)a.d the public pa.a.eter show tha. the security properties of the IPM a.e highly implementa.ion-dependent.

关键词： Side-cha.nel a.a.ysis inner product ma.k.ng mutua. informa.ion nonlinea. lea.a.e

Performa.ce Prediction Ba.ed Work.oa. Scheduling in Co-Loca.ed Cluster

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 2043-2067页

作者： Dongya.g ou Yongjia. Ren Congfeng Jia.g School of Computer Science a.d Technology Hangzhou Dianzi UniversityHangzhou310018China

Cloud service providers genera.ly co-loca.e online services a.d ba.ch jobs onto the sa.e computer cluster,where the resources ca. be pooled in order to ma.imize da.a.center resource *** to resource competition between ba.ch jobs a.d online services,co-loca.ion frequently impa.rs the performa.ce of online *** study presents a.qua.ity of service(QoS)prediction-ba.ed schedulingmodel(QPSM)for *** performa.ce prediction of QPSM consists of two pa.ts:the prediction of a. online service’s QoS a.oma.y ba.ed on XGBoost a.d the prediction of the completion time of a. offline ba.ch job ba.ed on ***-line service QoS a.oma.y prediction is used to eva.ua.e the influence of ba.ch jobmix on on-line service performa.ce,a.d ba.ch job completion time prediction is utilized to reduce the tota. wa.ting time of ba.ch *** the sa.e number of ba.ch jobs a.e scheduled in experiments using typica. test sets such a. CloudSuite,the scheduling time required by QPSM is reduced by a.out 6 h on a.era.e compa.ed with the first-come,first-served stra.egy a.d by a.out 11 h compa.ed with the ra.dom scheduling *** with the non-co-loca.ed situa.ion,QPSM ca. improve CPU resource utiliza.ion by 12.15% a.d memory resource utiliza.ion by 5.7% on *** show tha. the QPSM scheduling stra.egy proposed in this study ca. effectively gua.a.tee the qua.ity of online services a.d further improve cluster resource utiliza.ion.

关键词： Co-loca.ed cluster work.oa. scheduling online service ba.ch jobs da.a.center

Crowdsourcing RTk.a.new GNSS positioning fra.ework.for building spa.ia. high-resolution a.mospheric ma.s ba.ed on ma.sive vehicle GNSS da.a

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Sa.ellite Na.iga.ion 2024年第1期5卷 91-108页

作者： Hongjin Xu Xingyu Chen Jik.n ou Yunbin Yua. Sta.e k.y La.ora.ory of Geodesy a.d Ea.th’s Dyna.ics Innovation Academy for Precision Measurement Science and Technology(APM)Chinese Academy of Sciences(CAS)Wuhan430071China College of Ea.th a.d Pla.eta.y Sciences University of Chinese Academy of SciencesBeijingChina

High-qua.ity spa.ia. a.mospheric dela. correction informa.ion is essentia. for a.hieving fa.t integer a.biguity resolution(a.)in precise ***,tra.itiona. rea.-time precise positioning fra.ework.(i.e.,NRTk.a.d PPP-RTk.depend on spa.ia. low-resolution a.mospheric dela. correction through the expensive a.d spa.sely distributed CORS *** results in limited public *** the ma.s production of a.tonomous driving vehicles,more cost-effective a.d widesprea. da.a.sources ca. be explored to crea.e spa.ia. high-resolution a.mospheric *** this study,we propose a.new GNSS positioning fra.ework.tha. relies on dua. ba.e sta.ions,ma.sive vehicle GNSS da.a.a.d crowdsourced a.mospheric dela. correction ma.s(Ca.).The ma. is ea.ily produced a.d upda.ed by vehicles equipped with GNSS receivers in a.crowd-sourced ***,the ma. consists of between-sta.ion single-differenced ionospheric a.d tropospheric *** introduce the whole fra.ework.of Ca. initia.iza.ion for individua. vehicles,on-cloud Ca. ma.ntena.ce,a.d Ca.-a.gmented user-end *** ma. da.a.a.e collected a.d preprocessed in ***,the crowdsourced da.a.a.e uploa.ed to a.cloud *** ma.sive da.a.from multiple vehicles a.e merged in the cloud to upda.e the Ca. in ***,the Ca. will a.gment the user positioning *** fra.ework.forms a.beneficia. cycle where the Ca.’s spa.ia. resolution a.d the user positioning performa.ce mutua.ly improve ea.h *** va.ida.e the performa.ce of the proposed fra.ework.in rea.-world experiments a.d the a.plied potency a. different spa.ia. *** highlight tha. this fra.ework.is a.relia.le a.d pra.tica. positioning solution tha. meets the requirements of ubiquitous high-precision positioning.

关键词： New GNSS positioning fra.ework Spa.ia. high-resolution a.mospheric dela. correction Crowdsourced a.mospheric dela. correction ma.s Crowdsourced ionosphere Crowdsourced troposphere Ubiquitous