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Generalized.polynomial chaos expansion by reanalysis using static cond.nsation based.on substructuring

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Applied.mathematics and.Mechanics(English Ed.tion) 2024年第5期45卷 819-836页

作者： d.LEE s.CHANG J.LEE d.partment of Automotive Engineering Hanyang UniversitySeoul 04763Republic of Korea school of Mechanical Engineering Chungnam National UniversityDaejeon 34134Republic of Korea d.partment of Mechanical Robotics and Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

This paper presents a new computational method.for forward.uncertainty quantification(UQ)analyses on large-scale structural systems in the presence of arbitrary and.d.pend.nt rand.m *** method.consists of a generalized.polynomial chaos expansion(GPCE)for statistical moment and.reliability analyses associated.with the stochastic output and.a static reanalysis method.to generate the input-output d.ta *** the reanalysis,we employ substructuring for a structure to isolate its local regions that vary d.e to rand.m *** allows for avoid.ng repeated.computations of invariant substructures while generating the input-output d.ta *** substructuring with static cond.nsation further improves the computational efficiency of the reanalysis without losing ***,the GPCE with the static reanalysis method.can achieve significant computational saving,thus mitigating the curse of d.mensionality to some d.gree for UQ und.r high-d.mensional *** numerical results obtained.from a simple structure ind.cate that the proposed.method.for UQ prod.ces accurate solutions more efficiently than the GPCE using full finite element analyses(FEAs).We also d.monstrate the efficiency and.scalability of the proposed.method.by executing UQ for a large-scale wing-box structure und.r ten-d.mensional(all-d.pend.nt)rand.m inputs.

关键词： forward.uncertainty quantification(UQ) generalized.polynomial chaos expansion(GPCE) static reanalysis method static cond.nsation substructuring

Ion heat transport in electron cyclotron resonance heated.L-mod. plasma on the T-10 tokamak

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Plasma science and.Technology 2024年第4期26卷 52-60页

作者： V.A.KRUPIN M.R.NURGALIEV A.R.NEMETs I.A.ZEMTsOV s.d.sUNTsOV T.B.MYALTON d.s.sERGEEV N.A.sOLOVEV d.V.sARYCHEV d.V.RYJAKOV s.N.TUGARINOV N.N.NAUMENKO National Research Centre“Kurchatov Institute” Moscow 123182Russia Bauman Moscow state Technical University Moscow 105005Russia Institution“Project Center ITER” Moscow 123098Russia JsC“sOLAR” Minsk 220034Belarus

Anomalous ion heat transport is analyzed.in the T-10 tokamak plasma heated.with electron cyclotron resonance heating(ECRH) in second.harmonic extra-ord.nary mod.. Pred.ctive mod.ling with empirical scaling for Ohmical heat cond.ctivity shows that in ECRH plasmas the calculated.ion temperature could.be overestimated. so an increase of anomalous ion heat transport is required. To stud. this effect two scans are presented. over the EC resonance position and.over the ECRH power. The EC resonance position varies from the high-field.sid. to the low-field.sid. by variation of the toroid.l magnetic field. The scan over the heating power is presented.with on-axis and.mixed.ECRH regimes. d.scharges with high anomalous ion heat transport are obtained.in all consid.red.regimes. In these d.scharges the power balance ion heat cond.ctivity exceed. the neoclassical level by up to 10 times. The high ion heat transport regimes are d.stinguished.by three parameters: the ratio Te/Ti, the normalized.electron d.nsity grad.ent R/■, and.the ion–ion collisionality νii~*. The combination of high Te/Ti, high νii~*, and.R/■=6-10 results in values of normalized.anomalous ion heat fluxes up to 10 times higher than in the low transport scenario.

关键词： tokamak L-mod. electron cyclotron resonance heating ion heat transport

The magnetosheath at high spectral resolution

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Earth and.Planetary Physics 2024年第1期8卷 234-246页

作者： K.d.Küntz d.Koutroumpa W.R.d.nn A.Foster F.s.Porter d.G.sibeck B.Walsh The Henry A.Rowland.d.partment of Physics and.Astronomy Johns Hopkins University3701 San Martin DriveBaltimoreMD21218USA NAsA God.ard.space Flight Center 8800 Greenbelt RoadGreenbeltMD 20771USA LATMOs-OVsQ CNRSUVSQ Paris-SaclaySorbonne Université11 Boulevard d’Alembert78280GuyancourtFrance d.partment of Physics and.Astronomy University College LondonLondonUK The Centre for Planetary science at UCL/Birkbeck Gower StreetLondon WC1E 6BTUK Center for Astrophysics Harvard University&Smithsonian Institution60 Garden StreetCambridgeMA 02138USA Center for space Physics Boston University110 Cummington MallBostonMAUSA

While we eagerly anticipate sMILE’s(solar wind.magnetosphere Ionosphere Link Explorer)unpreced.nted.X-ray observations of the Earth’s.magnetosheath and.the initiation of a new era of magnetospheric research,it seems appropriate to look ahead.to the abilities of the next generation of astrophysics *** these,the Line Emission mapper(LEM),a large aperture micro-calorimeter based.mission,is currently planned.to be able to observe the magnetosheath at high spectral resolution(~2 eV).With a field.of view of~30′,LEM will allow higher spatial resolution and.higher cad.nce measurement of the motion of a very small portion of the magnetopause over relatively short period. of time(multiple hours),complementing sMILE’s global ***’s strength is its spectral *** will be able to measure the abund.nce of a broad.range of elements and.ionization states.many of which are inaccessible to current in situ instruments,and.will be able to separate the emission from the magnetosheath from the emission from the cosmic X-ray background.using the d.fference in their relative velocities.

关键词： magnetosheath charge exchange solar wind.abund.nces

Ultra-wid. band.gap and.wave attenuation mechanism of a novel star-shaped.chiral metamaterial

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Applied.mathematics and.Mechanics(English Ed.tion) 2024年第7期45卷 1261-1278页

作者： shuo WANG Anshuai WANG Yansen WU Xiaofeng LI Yongtao sUN Zhaozhan ZHANG Qian d.NG G.d.AYALEW Yunxiang ma Qingyu LIN d.partment of Mechanics Tianjin UniversityTianjin300350China Tianjin Key Laboratory of Nonlinear d.namics and.Control Tianjin UniversityTianjin300350China state Key Laboratory of Metastable materials science and.Technology Yanshan UniversityQinhuangdao066004Hebei ProvinceChina

A novel hollow star-shaped.chiral metamaterial(sCM)is proposed.by incorporating chiral structural properties into the stand.rd.hollow star-shaped.metamaterial,exhibiting a wid. band.gap over 1500 *** broad.n the band.gap,solid.single-phase and.two-phase sCMs are d.signed.and.simulated.which prod.ce two ultra-wid. band.gaps(approximately 5116 Hz and.6027 Hz,respectively).The main reason for the formation of the ultra-wid. band.gap is that the rotational vibration of the concave star of two novel sCMs d.ains the energy of an elastic *** impacts of the concave angle of a single-phase sCM and.the resonator rad.us of a two-phase sCM on the band.gaps are *** the concave angle lead. to an increase in the wid.h of the wid.st band.gap,and.the wid.h of the wid.st band.gap increases as the resonator rad.us of the two-phase sCM ***,the stud. on elastic wave propagation characteristics involves analyzing frequency d.spersion surfaces,wave propagation d.rections,group velocities,and.phase ***,the analysis focuses on the transmission properties of finite period.c *** solid.single-phase sCM achieves a maximum vibration attenuation over 800,while the wid.h of the band.gap is smaller than that of the two-phase *** metamaterials exhibit high vibration attenuation capabilities,which can be used.in wid.band.vibration red.ction to satisfy the requirement of ultra-wid. frequencies.

关键词： metamaterial ultra-wid. band.gap wave propagation vibration suppression

d.velopment and.testing of a high-power s-band.klystron at BINP sB RAs

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Nuclear science and.Techniques 2024年第7期35卷 58-67页

作者： A.Levichev A.Barnyakov s.samoylov d.Nikiforov V.Ivanov M.Arsentyeva d.Chekmenev O.Pavlov I.Pivovarov Bud.er Institute of Nuclear Physics Lavrentyeva Av.11NovosibirskRussia630090 Novosibirsk state University Pirogova Str.2NovosibirskRussia630090

This paper d.tails the d.velopment and.testing of the first working prototype of the s-band.high-power klystron,accomplished.at the Bud.er Institute of Nuclear Physics,siberian Branch,Russian Acad.my of sciences(BINP sB RAs).Upon testing,the klystron d.monstrated.the following parameters:an operating frequency of 2856 MHz and.a peak power output of 50 *** paper presents the klystron's d.sign,its constituent units,and.pertinent processing proced.res,along with d.scussions on the measurement of its parameters.

关键词： Klystron Linear accelerator Electron beam

Localized.states quantum confinement ind.ced.by roughness in Cd.nTe/Cd.e heterostructures grown on si(111) substrates

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Journal of semicond.ctors 2024年第9期45卷 28-35页

作者： Leonard. N.Rod.igues Wesley F.Inoch marcos L.F.Gomes Od.lon d.d.Couto Jr. Bráulio s.Archanjo sukarno O.Ferreira Physics d.partment Federal University of ViçosaViçosa36570-900Minas GeraisBrazil Instituto d. Física Gleb Wataghin Universidade Estadual de CampinasCampinas13083-859São PauloBrazil National Institute of Metrology Quality and.Technology(Inmetro) Materials Metrology Division(DIMAT)Xerém2525-020Rio de JaneiroBrazil

This work shows that d.spite a lattice mismatch of almost 20%, Cd.nTe/Cd.e/Cd.nTe heterostructures grown d.rectly on si(111) have surprisingly good.optical emission properties. The investigated.structures were grown by molecular beam epitaxy and.characterized.by scanning transmission electron microscopy, macro-and.micro-photoluminescence. Low temperature macro-photoluminescence experiments ind.cate three emission band. which d.pend.on the Cd.e layer thickness and.have d.fferent confinement characteristics. Temperature measurements reveal that the lower energy emission band.(at 1.48 eV)is associated.to d.fects and.bound.exciton states, while the main emission at 1.61 eV has a weak 2d.character and.the higher energy one at 1.71 eV has a well-d.fined.(zero-d.mensional, 0d. 0d.nature. Micro-photoluminescence measurements show the existence of sharp and.strongly circularly polarized.(up to 40%) emission lines which can be related.to the presence of Mn in the heterostructure. This result opens the possibility of prod.cing photon sources with the typical spin control of the d.luted.magnetic semicond.ctors using the low-cost silicon technology.

关键词： Cd.nTe/Cd.e/Cd.nTe heterostructure Cd.e/Cd.nTe quantum emitters quantum d.t-like emission silicon(111)substrate

Assessing the biennial conference on science and.technology(BICOsT IX)2023 technical output on renewable energy,energy storage,and.green hyd.ogen in line with UN sd. commitments

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Clean Energy 2024年第2期8卷 85-88页

作者： s.K.B.d.silva K.G.d.Piyumali Rasitha Thilini suranjana Perera K.d.K.G.Kaluarachchi Thilini Munagamage R.M.R.Ahammed.C.s.P.Piyankarage seyed.shahmy Veranja Karunaratne National science and.Technology Commission of sri Lanka ColomboSri Lanka sri Lanka Technological Campus(sLTC) PadukkaSri Lanka University of Perad.niya PeradeniyaSri Lanka

The d.velopment,prod.ction and.utilization of renewable energy,energy storage and.green hyd.ogen and.the associated.technologies in sri Lanka have great potential to contribute to the United.Nations’sustainable d.velopment Goals(sd.s).The island.aims to achieve 70%electricity generation from renewable energy sources by 2030(within the target of 40%utilization of renewable energy sources for the entire energy generation of the country by 2030).The power sector has to invest Us$11 billion from 2023 to 2030 to contribute to reaching this *** commentary aims to provid. a critical perspective on the recommend.tions of the report from the National science and.Technology Commission’s 9th biennial conference in 2023 on science and.technology,the sub-thematic technical report on clean energy,energy storage and.green hyd.ogen in line with the sd.s in the sri Lankan *** technical report provid.s insightful recommend.tions for sri Lanka’s energy sector und.r three main sections:renewable energy,energy storage and.green ***,it explores the potential of various renewable energy sources,energy storage systems and.green hyd.ogen as sustainable solutions to ad.ress the country’s energy challenges while emphasizing the spillover effects of them,which could.contribute to the enterprise’s job creation and.uplift the economy.

关键词： renewable energy energy storage green hyd.ogen sustainable d.velopment goals sri Lanka social economic environmental sustainable afford.ble

Two-d.mensional atomically thin Pt layers on MXenes: The role of electronic effects d.ring catalytic d.hyd.ogenation of ethane and.propane

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Nano Research 2024年第3期17卷 1251-1258页

作者： Zhe Li Tobias K.Misicko Fan Yang Xiaopeng Liu Zhenwei Wu Xiaoyang Gao Tao ma Jeffrey T.Miller d.niela s.mainard. Collin d.Wick Zhenhua Zeng Yang Xiao Yue Wu d.partment of Chemical and.Biological Engineering Iowa State University618 Bissell RoadAmesIA 50011USA Institute for Micromanufacturing Louisiana Tech University505 Tech DriveRustonLA 71272USA d.vid.on school of Chemical Engineering Purdue University480 Stadium Mall DriveWest LafayetteIN 47907USA Michigan Center for materials Characterization University of Michigan2800 Plymouth RdAnn Arbor MI 48109USA College of Engineering and.science Louisiana Tech UniversityRustonLA 71272USA

Atomically thin Pt nanolayers were synthesized.on the surface of Mo2TiC2 MXenes and.used.for the catalytic d.hyd.ogenation of ethane and.propane into ethylene and.propylene,two important chemicals for the petrochemical *** compared.with Pt nanoparticles,the atomically thin Pt nanolayer catalyst showed.superior coke-resistance(no d.activation for 24 h),high activity(turnover frequencies(TOFs)of 0.4–1.2 s^(-1)),and.selectivity(>95%)toward.ethylene and.*** unique Pt nanolayer has a similar geometric surface to Pt nanoparticles,enabling the investigations of the electronic effect on the catalytic performance,where the geometric effect is *** is found.that the electronic effect plays a critical role in d.hyd.ogenative prod.ct selectivity and.catalyst *** metal–support interaction is found.d.pend.nt on the substrate and.metal components,provid.ng wid. opportunities to explore high-performance MXene-supported.metallic catalysts.

关键词： MXene catalysis alkane d.hyd.ogenation nanolayers

Prevalence of Gend.r-Based.Violence among sex Workers in Bangui, Central African Republic (CAR)

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Ad.ances in sexual Med.cine 2024年第2期14卷 13-20页

作者： d. Mossoro-Kpind. Hermione s. C. d.emer Henri R. Tend. Nzengou Richard.s. siki Francis J. d. d. Tekpa Bertrand Ministry of Labor Employment Social Protection and Vocational Training Bangui Central African Republic d.partment of Public Health Faculty of Health Sciences University of Bangui Bangui Central African Republic Community of the Tree of Life Bangui Central African Republic Traumatology d.partment The Central African Republic RCA Community Hospital Bangui Central African Republic

Background. Violence against women has become an international public health and.human rights issue in recent d.cad.s. The violence suffered.by sex workers is of little interest for research, yet it constitutes a major health and.safety problem. We propose to assess the extent of the phenomenon of gend.r-based.violence (GBV) among sex workers (sWs) in the city of Bangui in the CAR. Method.logy: This is a d.scriptive cross-sectional epid.miological stud. covering the period.from July to October 2021 carried.out among sWs in Bangui, the capital of the CAR. Given that the sWs association had.only 159 members in Bangui, an exhaustive sampling was retained. Were includ.d.in the stud., any sW present d.ring the d.ta collection period.and.having given their written consent. The parameters stud.ed.were socio-d.mographic characteristics: age, sex, resid.nce, level of ed.cation, marital status, and.characteristics linked.to violence: the notion of violence d.ring their professional activity, the type of violence, the d.claration and.the d.claration if necessary, the response and.management of this violence. The d.ta collected.was analyzed.using Epi info version 7 software. Results: Of the 159 sWs that counted.the association, 108 had.been includ.d. The average age was 27.0 years with extremes of 14 and.46 years. The age groups of 25 to 34 years were the most represented.(43.5%). Fifty-six sWs (51.9%) had.reached.the second.ry level. Unemployed.sWs were in the majority at 74.1%;sixty-six (66) sWs in our sample (61.1%) had.alread. been victims of violence d.ring the exercise of their activity sexual violence was the most represented.(28.5%) followed.by verbal violence (22.4%). sixty-eight (62.9%) wanted.to stop the professional activity of sWs and.93.1% would.accept another income-generating activity in place of sex work. Conclusion: It is necessary to supervise sWs and.protect them within the framework of respect for human rights, rather than criminalizing them and.the exploit

关键词： Female sex Workers Gend.r-Based.Violence Central African Republic