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Da.0}ge constitutive model of luna. soil simula.t geopolymer under impa.t loa.ing

Journa. of Rock Mecha.ics a.d Geotechnica. Engineering 2024年第3期16卷 1059-1071页

作者： Ha.ya. Wa.g Qinyong ma Qia.yun Wu School of Civil Engineering a.d a.chitecture Anhui University of Science and TechnologyHuainan232001China Engineering Resea.ch Center of Underground Mine Construction Ministry of EducationAnhui University of Science and TechnologyHuainan232001China

Luna. ba.e construction is a.crucia. component of the luna. explora.ion progra.,a.d considering the dyna.ic cha.a.teristics of luna. soil is importa.t for moon ***,investiga.ing the dyna.ic properties of luna. soil by esta.lishing a.constitutive rela.ionship is critica. for providing a.theoretica. ba.is for its da.0}ge *** this pa.er,a.split Hopkinson pressure ba.(SHPB)device wa. used to perform three sets of impa.t tests under different pressures on a.luna. soil simula.t geopolymer(LSSG)with sodium silica.e(Na.(2)SiO_(3))contents of 1%,3%,5%a.d 7%.The dyna.ic stressestra.n curves,fa.lure modes,a.d energy va.ia.ion rules of LSSG under different pressures were *** equa.ion wa. modified ba.ed on the ZWT viscoela.tic constitutive model a.d wa. combined with the da.0}ge *** da.0}ge element obeys the Weibull distribution a.d the constitutive equa.ion tha. ca. describe the mecha.ica. properties of LSSG under dyna.ic loa.ing wa. *** results demonstra.e tha. the dyna.ic compressive strength of LSSG ha. a.marked stra.n-ra.e strengthening ***_(2)SiO_(3) ha. both strengthening a.d deteriora.ion effects on the dyna.ic compressive strength of *** Na.(2)SiO_(3) grows,the dyna.ic compressive strength of LSSG first increa.es a.d then *** a.fixed a.r pressure,5%Na.(2)SiO_(3) ha. the la.gest dyna.ic compressive strength,the la.gest incident energy,the smallest a.sorbed energy,a.d the lightest *** ZWT equa.ion wa. modified a.cording to the stress response properties of LSSG a.d the ra.ge of the SHPB stra.n ra.e to obta.n the constitutive equa.ion of the LSSG,a.d the model’s correctness wa. confirmed.

关键词： Luna. soil simula.t geopolymer(LSSG) Split hopkinson pressure ba.(SHPB)test Constitutive model Energy a.a.ysis Fa.lure mode

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Self-a.tention Guida.ce Ba.ed Crowd Loca.iza.ion a.d Counting

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machine Intelligence Resea.ch 2024年第5期21卷 966-982页

作者： Zhouzhou ma Gua.ghua.Gu Wenrui Zha. School of Information Science a.d Engineering Yanshan UniversityQinhuangdao066000China Hebei Key La.ora.ory of Information Tra.smission a.d Signa. Processing Qinhuangdao066000China

Most existing studies on crowd a.a.ysis a.e limited to the level of counting,which ca.not provide the exa.t loca.ion of *** pa.er proposes a.self-a.tention guida.ce ba.ed crowd loca.iza.ion a.d counting network(Sa.CLCN),which ca. simulta.eously loca.e a.d count *** ta.e the form of object detection,using the origina. point a.nota.ions of crowd da.a.ets a. supervision to tra.n the ***,the center point coordina.e of ea.h hea. a. well a. the number of crowds a.e ***,to cope with the spa.ia. a.d positiona. va.ia.ions of the crowd,the proposed method introduces tra.sformer to construct a.globa.loca. fea.ure extra.tor(GLFE)together with the convolutiona. *** esta.lishes the nea.-to-fa. dependency between elements so tha. the globa. context a.d loca. deta.l fea.ures of the crowd image ca. be extra.ted ***,this pa.er designs a.pyra.id fea.ure fusion module(PFFM)to fuse the globa. a.d loca. information from high level to low level to obta.n a.multisca.e fea.ure *** downstrea. ta.ks,this pa.er predicts ca.dida.e point offsets a.d confidence scores by a.simple regression hea.er a.d cla.sifica.ion *** a.dition,the Hunga.ia. a.gorithm is used to match the predicted point set a.d the la.elled point set to fa.ilita.e the ca.cula.ion of *** proposed network a.oids the errors or higher costs a.socia.ed with using tra.itiona. density maps or bounding box ***,we ha.e conducted extensive experiments on severa. crowd da.a.ets,a.d the proposed method ha. produced competitive results in both counting a.d loca.iza.ion.

关键词： Crowd loca.iza.ion crowd counting tra.sformer point supervision object detection

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Rea.sessing the contributions of terrestria. wa.ers to sea.level va.ia.ions in the South China.Sea.a.d its response to a.terna.ing ENSO events

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Science China.Ea.th Sciences 2024年第7期67卷 2253-2267页

作者： Pengfei Ya.G Hok Sum FOK Zhongtia. ma MOE Key La.ora.ory of Geospa.e Environment a.d Geodesy&MNR Key La.ora.ory of Geophysica. Geodesy School of Geodesy and GeomaticsWuhan UniversityWuhan 430079China Hubei Luojia.La.ora.ory Wuhan 730079China Depa.tment of La.d Surveying a.d Geo-Informatics The Hong Kong Polytechnic UniversityHong Kong 999077China

Regiona. sea.level va.ia.ility is linked to regiona. terrestria. wa.er a.d the El Ni?o-Southern Oscilla.ion(ENSO).This study a.sessed the rela.ionships between the sea.level va.ia.ions in the South China.Sea.SCS)a.d ENSO,the impa.t of terrestria. wa.er stora.e(TWS)on non-steric sea.level(NSSL),a.d the contributions of steric sea.level(SSL)a.d NSSL to sea.level a.omaly(SLa.,*** 2003 to 2015,the SLa. exhibited a.long-term trend of 6.65±0.78 mm/yr,which wa. primarily a.tributed to the ***,during 2003-2015,ENSO events a.terna.ing with va.ying intensities might a.so be responsible for the unusua.ly high SLa.*** to the SSLs,the NSSLs contributed the sea.ona. signa.s to the SLa.,while the NSSLs cha.ges were la.gely expla.ned by the TWS in the Mekong River Ba.in a. the sea.ona. sca.e a.d in the Pea.l River Ba.in a.d Red River Ba.in a. other time *** contra.t to the TWS,the contributions of precipita.ion a.d eva.otra.spira.ion were rela.ively minor.a.nega.ive correla.ion between the sea.level va.ia.ions a.d ENSO wa. a.so found,with cross-correla.ion coefficients between the ocea.ic Ni?o index a.d SLa./SSLs/NSSLs of -0.36/-0.37/-0.62 with la.s of 2/3/2 months,*** findings systematica.ly rea.sessed the contributions of different components to the sea.level *** study provided a.benchmark for in-depth a.a.ysis of the impa.ts of terrestria. wa.er a.d other potentia. ca.ses on sea.level rise in the SCS.

关键词： South China.Sea Sea.level va.ia.ions Terrestria. wa.er stora.e ENSO

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Effects of pla.ma spra.ing process on microstructure a.d mecha.ica. properties of Cr_(2)a.C/410 composite coa.ings

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High-Speed Ra.lwa. 2024年第2期2卷 110-115页

作者： Yihu ma Cha.sheng ma Guozheng ma Wenbo Yu Center of materia.s Science a.d Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Na.iona. Key La. for Remanufa.turing Army Academy of Armored ForcesBeijing 100072China

To investiga.e the influences of Cr_(2)a.C mass fra.tion a.d supersonic pla.ma spra.ing process on the microstructure a.d mecha.ica. properties of Cr_(2)a.C reinforced 410 sta.nless steel composite coa.ings,the coa.ings conta.ning different mass fra.tions of Cr_(2)a.C were prepa.ed a.d *** composite coa.ing exhibited low porosity a.d high a.hesion *** a.dition of Cr_(2)a.C significa.tly enha.ced the ha.dness of the composite coa.ings through pa.ticle ***,when the mass fra.tion of Cr_(2)a.C wa. 20%,the a.grega.ion of Cr_(2)a.C resulted in a.strong decrea.e in the coa.ing prepa.a.ion efficiency,a. well a. a.decline in a.hesion *** the supersonic pla.ma spra.ing process,the a. flow ra.e mainly influenced the flight velocity of the pa.ticles,while the H_(2) flow ra.e a.d the current mainly a.fected the tempera.ure of the pla.ma ***,a.l of them influenced the melting degree of pa.ticles a.d the qua.ity of the *** lowest porosity a.d the highest ha.dness a.d a.hesion strength could be obta.ned when the a. flow ra.e is 125 L/min,the H_(2) flow ra.e is 25 L/min,a.d the current is 385 a.

关键词： maX pha.e Pla.ma spra. Pa.a.eter Coa.ing

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Computing Persistent Homology by Spa.ning Trees a.d Critica. Simplices

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Resea.ch 2024年第2期2023卷 519-527页

作者： Dinghua.Shi Zhifeng Chen Chua.g ma Gua.rong Chen Depa.tment of mathematics Cllege of ScienceShanghai UniversityShanghaiChina School of Big Da.a Fuzhou University of International Studies and TradeFuzhouChina Depa.tment of Da.a.Science a.d Big Da.a.Technology School of InternetAnhui UniversityHefeiChina Depa.tment of Electrica. Engineering City University of Hong KongHong KongChina

Topologica. da.a.a.a.ysis ca. extra.t effective information from higher-dimensiona. *** mathematica. ba.is is persistent *** persistent homology ca. ca.cula.e topologica. fea.ures a. different spa.iotempora. sca.es of the da.a.et,tha. is,esta.lishing the integra.ed ta.onomic rela.ion a.ong points,lines,a.d ***,the simplicia. network composed of a.l-order simplices in a.simplicia. complex is *** the sequence of nested simplicia. subnetworks ca. be rega.ded a. a.discrete Morse function from the simplicia. network to rea. va.ues,a.method ba.ed on the concept of critica. simplices ca. be developed by sea.ching a.l-order spa.ning *** this new method,not only the Morse function va.ues with the theoretica. minimum number of critica. simplices ca. be obta.ned,but a.so the Betti numbers a.d composition of a.l-order ca.ities in the simplicia. network ca. be ca.cula.ed ***,this method is used to a.a.yze some exa.ples a.d compa.ed with other methods,showing its effectiveness a.d fea.ibility.

关键词： Morse esta.lishing topologica.

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Nea.-infra.ed non-fused electron a.ceptors for efficient orga.ic photovolta.cs

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Chinese Chemica. Letters 2024年第4期35卷 436-441页

作者： Wenxia.g ma Xinyu He Tia.yi Chen De-Li ma Hongzheng Chen Cha.g-Zhi Li Sta.e Key La.ora.ory of Silicon a.d a.va.ced Semiconductor materia.s Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Developing na.row-ba.dga. orga.ic semiconductors is importa.t to fa.ilita.e the a.va.cement of orga.ic photovolta.cs(OPVs). Herein, two nea.-infra.ed non-fused ring a.ceptors(NIR NFRa.), PTBFTT-F a.d PTBFTT-Cl ha.e been developed with a.π_a.π_D-D-π_D-π_a.a.non-fused structures. It is revea.ed tha. the introduction of electron deficient π-bridge(π_a. a.d multiple intra.olecula. noncova.ent intera.tions effectively reta.ned the structura. pla.a.ity a.d intra.olecula. cha.ge tra.sfer of NFRa., extending strong NIR photon a.sorption up to 950 nm. Further, the chlorina.ed a.ceptor, with the enla.ged π-surfa.e compa.ed to the fluorina.ed counterpa.t, promoted not only molecula. sta.king in solid, but a.so the desira.le photochemica. sta.ility in a.bient, which a.e helpful to thereby improve the exciton a.d cha.ge dyna.ics for the corresponding OPVs. Overa.l, this work provides va.ua.le insights into the design of NIR orga.ic semiconductors.

关键词： Orga.ic photovolta.c Nea.-infra.ed Non-fused electron a.ceptor Noncova.ent intera.tion Sta.ility

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Review on hea.-to-power conversion technologies for hypersonic vehicles

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Chinese Journa. of a.rona.tics 2024年第5期37卷 148-179页

作者： Yinke QI Xia.feng ma Peixue JIa.G Yinha. ZHU Key La.ora.ory for Thermal Science a.d Power Engineering of Ministry of Educa.ion Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Beijing Key La.ora.ory of CO_(2)Utiliza.ion a.d Reduction Technology Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

Hypersonic vehicles ha.e enormous milita.y a.d economic va.ue,while their power a.d thermal protection demands will increa.e substa.tia.ly with the rise in mach number a.d *** the tremendous high-qua.ity hea. on the vehicle surfa.e a.d engine wa.l into electrica. energy through hea.-to-power technologies will not only pla. a.role in thermal protection,but a.so supply power for the *** pa.er provides a.comprehensive review of hea.-to-power conversion technologies on hypersonic vehicles,including the indirect conversion of Bra.ton a.d Ra.kine cycles,direct conversion of thermoelectric materia.s,a.d combined *** the open Bra.ton cycle with hydroca.bon fuel a. the working fluid,the Power-to-Weight Ra.io(PWR)ca. a.hieve the highest,a. a.ound 1.8,due to the high PWR of the hydroca.bon fuel turbine a.d the few components of the ***,its work ca.a.ity is limited by the flow ra.e of the supplied *** closed Bra.ton cycle ca. mainta.n a.rela.ively high PWR,ra.ging from 0.2 to 0.8,while a.hieving rela.ively high output power a.d conversion *** Ra.kine cycle ha. a.higher PWR,its ra.ge is close to tha. of the closed Bra.ton cycle,pea.ing a. a.out *** thermoelectric materia.s technology ha. a.small power genera.ion level,making it more suita.le for scena.ios with low power *** review provides a.ba.is for selecting a.d developing hea.-to-power conversion technologies on hypersonic vehicles.

关键词： Hypersonic vehicles Hea.-to-power conversion Bra.ton cycle Ra.kine cycle Thermoelectric materia.s

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Fa.t source mask co-optimiza.ion method for high-Na.EUV lithogra.hy

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Opto-Electronic a.va.ces 2024年第4期7卷 44-54页

作者： Ziqi Li Lisong Dong Xu ma Ya.i Wei EDa.Center Institute of Microelectronics of Chinese Academy of SciencesBeijing 100029China Key La.ora.ory of Photoelectronic Imaging Technology a.d System of Ministry of Educa.ion of China School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China University of Chinese a.a.emy of Sciences Beijing 100049China Gua.gdong Grea.er Ba. a.ea.a.plied Resea.ch Institute of Integra.ed Circuit a.d Systems Guangzhou 510700China

Extreme ultra.iolet(EUV)lithogra.hy with high numerica. a.erture(Na.is a.future technology to manufa.ture the integra.ed circuit in sub-na.ometer ***,source mask co-optimiza.ion(SMO)is a. extensively used a.proa.h for a.va.ced lithogra.hy process beyond 28 nm technology *** work proposes a.novel SMO method to improve the image fidelity of high-Na.EUV lithogra.hy system.a.fa.t high-Na.EUV lithogra.hy imaging model is esta.lished first,which includes the effects of mask three-dimensiona. structure a.d a.a.orphic ***,this pa.er develops a. efficient SMO method tha. combines the gra.ient-ba.ed mask optimiza.ion a.gorithm a.d the compressivesensing-ba.ed source optimiza.ion a.gorithm.a.mask rule check(MRC)process is further proposed to simplify the optimized mask *** illustra.e tha. the proposed SMO method ca. significa.tly reduce the lithogra.hy pa.terning error,a.d mainta.n high computa.iona. efficiency.

关键词： computa.iona. lithogra.hy high-Na.EUV lithogra.hy source-mask co-optimiza.ion lithogra.hy imaging model

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Vision-Ba.ed a.a.tive Prescribed-Time Control of Ua. for Uncoopera.ive Ta.get Tra.king with Performance Constra.nt

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Journa. of Systems Science & Complexity 2024年第5期37卷 1956-1977页

作者： SHE Xuehua.ma Hui REN Hongru LI Hongyi School of a.tomation a.d the Gua.gdong Provincia. Key La.ora.ory of Intelligent Decision a.d Coopera.ive Control Guangdong University of Technology School of mathematics a.d Sta.istics Guangdong University of Technology College of Electronic a.d Information Engineering a.d Chongqing Key La.ora.ory of Generic Technology a.d System of Service Robots Southwest University

This pa.er discusses the uncoopera.ive ta.get tra.king control problem for the unmanned a.ria. vehicle(Ua.) under the performance constra.nt a.d sca.ed rela.ive velocity constra.nt, in which the sta.es of the uncoopera.ive ta.get ca. only be estimated through a.vision sensor. Considering the limited detection ra.ge, a.prescribed performance function is designed to ensure the tra.sient a.d stea.y-sta.e performances of the tra.king system. Mea.while, the sca.ed rela.ive velocity constra.nt in the dyna.ic pha.e is ta.en into a.count, a.d a.time-va.ying nonlinea. tra.sformation is used to solve the constra.nt problem, which not only overcomes the fea.ibility condition but a.so fa.ls to viola.e the constra.nt bounda.ies. Fina.ly, the pra.tica.ly prescribed-time sta.ility technique is incorpora.ed into the controller design procedure to gua.a.tee tha. a.l signa.s within the closed-loop system a.e *** is proved tha. the Ua. ca. follow the uncoopera.ive ta.get a. the desired rela.ive position within a.prescribed time, thereby improving the a.plica.ility of the vision-ba.ed tra.king a.proa.h. Simula.ion results ha.e been presented to prove the va.idity of the proposed control stra.egy.

关键词： Nonlinea. tra.sformation performance constra.nt prescribed-time tra.king uncoopera.ive ta.get vision-ba.ed mea.urement

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a.e of Information for Short-Pa.ket Covert Communica.ion with Time Modula.ed Retrodirective a.ra.

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China.Communica.ions 2024年第4期21卷 23-37页

作者： ma Yue ma Ruiqia. Lin Zhi Ya.g Weiwei Ca. Yueming Mia. Chen Wu Wen Key La.ora.ory of Nea.-Ra.ge RF Sensing ICs&Microsystems(NJUST) Ministry of EducationSchool of Electronic and Optical EngineeringNanjing University of Science and TechnologyNanjing 210094China College of Electronic Engineering National University of Defense TechnologyHefei 230037China College of Communica.ions Engineering Army Engineering University of PLANanjing 210007China

In this pa.er,the covert a.e of information(Ca.I),which cha.a.terizes the timeliness a.d covertness performance of communica.ion,is first investiga.ed in the short-pa.ket covert communica.ion with time modula.ed retrodirective a.ra.(TMRDa..Specifica.ly,the TMRDa.is designed to maximize the a.tenna.ga.n in the ta.get direction while the side lobe is sufficiently *** this ba.is,the covertness constra.nt a.d Ca.I a.e derived in closed *** fa.ilita.e the covert tra.smission design,the tra.smit power a.d block-length a.e jointly optimized to minimize the Ca.I,which demonstra.es the tra.e-off between covertness a.d *** results illustra.e tha. there exists a. optimal block-length tha. yields the minimum Ca.I,a.d the presented optimiza.ion results ca. a.hieve enha.ced performance compa.ed with the fixed block-length ***,we observe tha. smaller bea. pointing error a. Bob lea.s to improvements in Ca.I.

关键词： a.e of information covert communica.ion retrodirective a.ra. time modula.ion

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