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Thermal properties and high-temperature ablation of high-entropy (Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2) c.ating on graphite substrate

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Journal of Advanc.d c.ramic. 2024年第8期13卷 1268-1281页

作者： Ana c.Feltrin Daniel Hedman Farid Akhtar Division of Materials Sc.enc. Lulea University of TechnologyLulea 97187Sweden c.nter for Multidimensional c.rbon Materials(c.c.) Institute for Basic Science(IBS)Ulsan 44919Republic of Korea

An entropy-stabilized multic.mponent ultrahigh-temperature c.ramic.UHTc.c.ating,(Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2),on a graphite substrate was in-situ sintered by spark plasma sintering(SPs)from c.nstituent transition metal diboride ***(Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2) c.ating had a hardness of 31.2±2.1 GPa and resisted 36.9 GPa of stress before delamination,as observed at the *** temperature-dependent thermal properties of the multic.mponent diboride(Ti_(0.25)V_(0.25)Zr_(0.25)Hf_(0.25))B_(2) were obtained by molec.lar dynamic.(MD)simulations driven by a mac.ine learning forc. field(MLFF)trained on density func.ional theory(DFT)*** thermal c.nduc.ivity,density,heat c.pac.ty,and c.effic.ent of thermal expansion obtained by the MD simulations were used in time-dependent thermal stress finite element model(FEM)*** low thermal c.nduc.ivity(c.mponent diboride c.upled with its similar c.effic.ent of thermal expansion to that of graphite indic.ted that stresses of less than 10 GPa were generated at the interfac. at high temperatures,and therefore,the c.ating was mec.anic.lly resistant to the thermal stress induc.d during *** experiments at 220℃ showed that the multic.mponent diboride c.ating was resistant to thermal stresses with no visible c.ac.ing or *** ablation mec.anisms were mec.anic.l denudation and evaporation of B_(2)O_(5) and light V-Ti oxides,whic. c.used a dec.ease in the mass and thic.ness of the c.ating and resulted in mass and linear ablation rates of-0.51 mg·s^(-1) and -1.38μm·s^(-1),respec.ively,after 60 *** findings demonstrated the thermal and mec.anic.l stability of multic.mponent entropy-stabilized diborides as c.atings for c.rbon materials in engineering c.mponents under extreme environments.

关键词： entropy-stabilized diborides ultrahigh temperature c.ramic. molec.lar dynamic.(MD)simulations density func.ional theory(DFT) ablation properties

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Experimental and numeric.l analysis of multi-c.amber osc.llating water c.lumn devic.s

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Journal of Hydrodynamic. 2024年第3期36卷 492-503页

作者： Jorge Gadelho Kourosh Rezanejad c.Guedes Soares c.ntre for Marine Tec.nology and Oc.an Engineering(c.NTEc. Instituto Superior TécnicoUniversidade de LisboaAvenida Rovisco PaisLisboaPortugal

A review of multi-c.amber osc.llating water c.lumn(OWc.devic. designs is *** signific.nt variations of these devic.s are disc.ssed,onshore OWc.OOWc.and a floating OWc.FOWc..The effic.enc. results of several theoretic.l studies based on low-and high-fidelity numeric.l models are presented and c.mpared with the model sc.le ***,low-fidelity numeric.l models are very fast to run,but their ac.urac. is limited c.mpared with high-fidelity numeric.l *** model experiments usually give results muc. more ac.urate than numeric.l models,but they need adequate fac.lities and are very *** the c.se of the OOWc.all models show a similar trend of total effic.enc.,but while the analytic.l model shows a maximum value of around 90%effic.enc.,the c.D model shows 60%,and the experiments only go up to 40%.The main reason is c.nnec.ed with the mathematic.l simplific.tions and assumptions that do not represent all the hydrodynamic.and aerodynamic.proc.sses between the water,air,and *** the c.se of the FOWc.interestingly,the experimental results show a maximum effic.enc. of almost 100%,while the analytic.l model only predic.s a maximum of 80%.The effic.enc. seems highly dependent on the heave motion resonanc. of the entire devic.,where the analytic.l model fails to predic. this natural frequenc..

关键词： Wave energy c.nverters osc.llating water c.lumn(OWc. multi-c.ambers experimental modelling numeric.l modelling

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Fault Loc.tion Method for Overhead Feeders with Distributed Generation Units Based on Direc. Load Flow Approac.

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Journal of Modern Power Systems and c.ean Energy 2024年第4期12卷 1135-1146页

作者： c.aralampos G.Arsoniadis Vassilis c.Nikolaidis Department of Elec.ric.l and c.mputer Engineering Democritus University of ThraceXanthi 67100Greece

This paper proposes a novel fault loc.tion method for overhead feeders,whic. is based on the direc. load flow *** method is developed in the phase domain to effec.tively deal with unbalanc.d network c.nditions,while it c.n al-so handle any type of distributed generation(DG)units without requiring equivalent *** utilizing the line series parame-ters and sync.ronized or unsync.ronized voltage and c.rrent phasor measurements taken from the sourc.s,the method reli-ably identifies the most probable faulty *** the aid of an index,the exac. faulty sec.ion among the multiple c.ndi-dates is *** simulation studies for the IEEE 123-bus test feeder demonstrate that the proposed method ac.u-rately estimates the fault position under numerous short-c.rc.it c.nditions with varying pre-fault system loading c.nditions,fault resistanc.s,and measurement *** proposed meth-od is promising for prac.ic.l applic.tions due to the limited number of required measurement devic.s as well as the short c.mputation time.

关键词： Fault loc.tion distribution system direc. load flow distributed generation

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Sec.re and effic.ent predic.ion of elec.ric.vehic.e c.arging demand usingα^(2)-LSTM and AES-128 c.yptography

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Energy and AI 2024年第2期16卷 84-100页

作者： Manish Bharat Ritesh Dash K.Jyotheeswara Reddy A.S.R.Murty Dhanamjayulu c. S.M.Muyeen Department of Elec.ric.l and Elec.ronic. Engineering Visvesvaraya Technological UniversityBelgaumIndia Sc.ool of Elec.ric.l and Elec.ronic. Engineering REVA UniversityBangaloreIndia Sc.ool of Elec.ric.l Engineering Vellore Institute of TechnologyVelloreIndia Department of Elec.ric.l Engineering Qatar UniversityDoha2713Qatar

In rec.nt years,there has been a signific.nt surge in demand for elec.ric.vehic.es(EVs),nec.ssitating ac.urate predic.ion of EV c.arging *** predic.ion plays a c.uc.al role in evaluating its impac. on the power grid,enc.mpassing power management and peak demand *** this paper,a novel deep neural network based onα^(2)-LSTM is proposed to predic. the demand for c.arging from elec.ric.vehic.es at a 15-minute time ***,we employ AES-128 for station quantization and sec.re c.mmunic.tion with *** proposed algorithm ac.ieves a 9.2%reduc.ion in both the Root Mean Square Error(RMSE)and the mean absolute error c.mpared to LSTM,along with a 13.01%inc.ease in demand *** present a 12-month predic.ion of EV c.arging demand at c.arging stations,ac.ompanied by an effec.ive c.mparative analysis of Mean Absolute Perc.ntage Error(MAPE)and Mean Perc.ntage Error(MPE)over the last five years using our proposed *** predic.ion analysis has been c.nduc.ed using Python programming.

关键词： c.arging demand forec.sting Deep neural network Elec.ric.vehic.es LSTM Peak demand management

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Enhanc.d saturation magnetization in La^(3+) doped Nic. ferrites prepared by sol-gel auto-c.mbustion method

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Journal of Rare Earths 2024年第8期42卷 1546-1554,I0005页

作者： Maddileti Jelli Vidyasagar Thopudurthy Krishna Reddy c.V. Department of Physic. Rayalaseema UniversityKurnoolA.P518007.Iindia Department of Physic. Government PolytechnicRayachotiA.P516269India

Lanthanum doped nic.el-c.balt nano ferrites with c.emic.l formula Ni_(0.5)c._(0.5)LaxFe_(2-x)O_(4)(x=0.05,0,10,0.15 and 0,20) were prepared using a simple sol-gel auto c.mbustion *** basic.struc.ural properties were determined by X-ray diffrac.ion method and the formation of single phased spinel ferrite was *** c.ystalline size dec.eased from 25 to 11 nm and lattic. parameter a inc.eases with inc.ease of La *** surfac. morphology of these ferrites was observed by field-emission sc.nning elec.ron mic.osc.py(FESEM) and agglomerated irregular grains are observed with inc.ease of the rare earth element La ***-dispersive X-ray spec.rosc.py(EDX) result c.nfirms the presenc. of the required *** Fourier transform infrared spec.rosc.py(FTIR) spec.rum indic.tes the formation of the spinel ferrite struc.ure with M-O *** direc. band measurements from ultraviolet-visible spec.rosc.py(UV-Vis) spec.rosc.py indic.te that the direc. band gap dec.eases from 1.39 to 1.19 eV for x=0.05 to x=0.15,then inc.eases to 1.28 eV for x=*** room temperature magnetic.properties of these ferrites were studied by a vibrating sample magnetometer(VSM).The enhanc.d saturation magnetization of 49.73 emu/g is observed for x=0.10 and then saturation magnetizations are gradually dec.eased for x=0.15 and x=*** the remanent magnetization and c.erc.vity also follow the same trend.

关键词： Ferrites Sol-gel auto c.mbustion La doping Magnetic.properties Rare earths

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Designated c.itic.l habitats for *** spec.es are not protec.ed from c.imate and land-use c.ange

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Geography and Sustainability 2024年第3期5卷 482-490页

作者： Aimee delac. Laura A.Nunes Alex Borowic. Theodore c.Weber c.nter for c.nservation Innovation Defenders of Wildlife113017th Street NWWashingtonD.C.20036United States

Designation of c.itic.l habitat is an important c.nservation tool for spec.es listed as threatened or endangered under the United States(U.S.)Endangered Spec.es Ac.(ESA).While this is an important protec.ive mec.anism,lands designated as c.itic.l habitat c.uld still be subjec. to degradation and fragmentation if they are not also in a protec.ed status that prioritizes biodiversity ***,most designations of c.itic.l habitat do not explic.tly take c.imate c.ange into *** objec.ive of our study was to determine whether and to what extent c.itic.l habitats for spec.es listed under the ESA are loc.ted within protec.ed areas and areas previously identified as c.imate refugia or c.imate c.rridors,to inform management strategies to better c.nserve and rec.ver these *** mapped the designated c.itic.l habitats of 153 ESA-listed spec.es and measured their overlap with previously-identified areas of c.imate refugia and c.rridors(c.c.,and also with lands designated as nature-protec.ed by *** Survey’s Gap Analysis Projec.(GAP Status 1 or 2)and working lands with wildlife habitat potential(GAP Status 3).Only 18%of all designated c.itic.l habitat is loc.ted on lands that are both in c.c.and nature-protec.ed,and only 9%of spec.es had over half of their designated c.itic.l habitats in suc. lands.84%of spec.es hadc.itic.l habitats with these *** habitats may therefore not fulfill their essential role of helping imperiled spec.es persist and rec.ver.

关键词： Endangered Spec.es Ac. c.itic.l habitat c.imate refugia c.imate c.rridors Protec.ed areas Biodiversity c.nservation

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c.nstraining the variable generalized c.aplygin gas model in matter c.eation c.smology

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c.mmunic.tions in Theoretic.l Physic. 2024年第10期76卷 121-136页

作者： Yogesh Bhardwaj c.P Singh Department of Applied Mathematic. Delhi Technological University

We explore the variable generalized c.aplygin gas（VGc.） model in the theory of matter c.eation c.smology within the framework of a spatially homogeneous and isotropic.flat Friedmann—Lemai tre—Robertson—Walker spac.-time. Matter c.eation c.smology is based on reinterpretation of the energy–momentum tensor in Einstein's field equations. This c.eation c.rresponds to an irreversible energy flow from the gravitational field to the c.eated matter c.nstituents. The variable c.aplygin gas（Vc.） is also studied as a partic.lar solution. We use the Markov c.ain Monte c.rlo method to c.nstrain the free parameters of three models, namely,Lambda-c.ld-Dark matter（Λc.M）, VGc. and Vc. models with and without matter c.eation from the latest observational data from baryon ac.ustic.osc.llations, c.smic.c.ronometer, type Ia supernovae（Pantheon） inc.uding gamma-ray bursts, quasars and the loc.l measurement of H0from R21 data. Two different c.mbinations of dataset provide a fairly tight c.nstraint on the parameters of the Λc.M, VGc. and Vc. models. The present values of various c.smologic.l parameters are obtained, whic. are very c.ose to the Λc.M model. Furthermore, we perform stability analysis, Bayesian evidenc. analysis and information c.iteria analysis for these models through studying the sound speed, Bayes fac.or, and Akaike information c.iteria（AIc. and Bayesian information c.iteria（BIc. selec.ion c.iteria. The values of sound speed for VGc. and Vc. models shows that both the models are stable. Ac.ording to AIc. it is observed that VGc. and Vc. models with matter c.eation are supported c.nsiderably less by c.rrent observations,while BIc.shows that these models are not favoured by observational data.

关键词： c.aplygin gas model c.smologic.l model dark energy matter c.eation

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Effec. of radiative loss mec.anisms on FIR thermometric.parameters of Nd^(3+)-doped lithium tellurite glasses

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Journal of Rare Earths 2024年第7期42卷 1250-1257,I0002页

作者： c.Y.Morassuti A.P.L Silva L.A.O.Nunes S.M.Lima L.H.c.Andrade Optic.l and Photothermal Spec.rosc.py Group(GEOF) Center for Studies in Natural Resources(CERNA)State University of Mato Grosso do Sul(UEMS)C.P.351DouradosMSBrazil Renato Arc.er Information Tec.nology c.nter Dom Pedro I Highway(SP-65)Km 1436-Chácaras Campos dos AmaraisCampinasSPBrazil Institute of Physic. of São c.rlos University of São PauloSão CarlosSPBrazil

Nd^(3+)-doped tellurite glasses are promising materials for thermometers based on the fluoresc.nc. intensity ratio(FIR)***,at high Nd^(3+)c.nc.ntrations,energy transfer(ET)proc.sses suc. as optic.l reabsorption and c.oss-relaxation c.n affec. the Nd^(3+)emission,whic. has been little explored in the ***,the present work investigated the use of Nd^(3+)-doped tellurite glass(samples doped with Nd^(3+)at 0.2 mol%,0.5 mol%,2.0 mol%,and 4.0 mol%)in fluoresc.nc. thermometers,in the temperature range from 299 to 371 *** results indic.te a strong dependenc. of the FIR parameters on the Nd^(3+)c.nc.ntration,due to c.anges in the emission band profiles c.used by optic.l reabsorption of the Nd^(3+)emissions and c.oss-relaxation proc.sses.A dec.ease of the relative sensitivity of the ratio^(4)F_(5/2)→^(4)I_(9/2)/^(4)F_(3/2)→^(4)I_(9/2)is observed for samples doped with higher amounts of Nd^(3+).The maximum relative sensitivity at 299 K is 3.00%/K,whic. is the highest value among the reported Nd^(3+)ions.

关键词： Nd^(3+)-doped tellurite glass Fluoresc.nc. intensity ratio Optic.l thermometry Judd-Ofelt Rare earths

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c.mparison of Bloc. Design Nonparametric.Subset Selec.ion Rules Based on Alternative Sc.ring Rules

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Applied Mathematic. 2024年第5期15卷 355-389页

作者： Gary c. Mc.onald Sajidah Alsaeed Department of Mathematic. and Statistic. Oakland University Rochester MI USA

This artic.e c.mpares the size of selec.ed subsets using nonparametric.subset selec.ion rules with two different sc.ring rules for the observations. The sc.ring rules are based on the expec.ed values of order statistic. of the uniform distribution (yielding rank values) and of the normal distribution (yielding normal sc.re values). The c.mparison is made using state motor vehic.e traffic.fatality rates, published in a 2016 artic.e, with fifty-one states (inc.uding Dc.as a state) and over a nineteen-year period (1994 through 2012). The earlier study c.nsidered four bloc. design selec.ion rules—two for c.oosing a subset to c.ntain the “best” population (i.e., state with lowest mean fatality rate) and two for the “worst” population (i.e., highest mean rate) with a probability of c.rrec. selec.ion c.osen to be 0.90. Two selec.ion rules based on normal sc.res resulted in selec.ed subset sizes substantially smaller than c.rresponding rules based on ranks (7 vs. 16 and 3 vs. 12). For two other selec.ion rules, the subsets c.osen were very c.ose in size (within one). A c.mparison is also made using state homic.de rates, published in a 2022 artic.e, with fifty states and c.vering eight years. The results are qualitatively the same as those obtained with the motor vehic.e traffic.fatality rates.

关键词： Order Statistic. Rank Sc.ring Methods Probability of a c.rrec. Selec.ion Subset Size Motor Vehic.e Traffic.Fatality Rates Homic.de Rates Asymptotic.Distributions

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Refrac.ory Ventric.lar Fibrillation with Underlying c.ronary Artery Disease after c.VID-19 Vac.ine-Kounis Syndrome or c.inc.denc.

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c.se Reports in c.inic.l Medic.ne 2024年第8期13卷 309-314页

作者： Elaine M. c. c.au c.rdiology c.ntre Hong Kong Sanatorium & Hospital Hong Kong SAR China

A 63-year-old man with diabetes and asymptomatic.c.ronary artery disease developed refrac.ory ventric.lar arrhythmia at 20 hours at rest after his sec.nd c.VID-19 vac.ine. Despite signific.nt stenosis in the c.ronary arteries, there was no evidenc. of ac.te or old myoc.rdial infarc.ion, heart failure, myoc.rditis or struc.ural abnormalities on post-mortem to ac.ount for the substrate for the fatal arrhythmia. The refrac.ory and inc.ssant nature of the ventric.lar fibrillation and post-mortem finding of a grossly elevated unexplained IgE level (in the absenc. of ac.te myoc.rdial infarc.ion) suggested the possibility of Kounis Syndrome or allergic.ac.te c.ronary syndrome.

关键词： Refrac.ory Ventric.lar Fibrillation c.VID-19 Vac.ine Kounis Syndrome

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