简介:ToevaluatethepossibilityofusingGd-Si-Gealloysinmagneticrefrigerators,samplesofGd-Si-GealloysweremadeofdomesticGd.Themagnetocaloriceffectofsampleswasestimatedbymagneticentropychange(-ΔSm)calculatedfromM-HcurvesaccordingtoMaxwellrelation.ThefirstorderphasetransformationwasdestroyedduetotheimpuritiesinthecommercialGd,sothatnogiantmagnetocaloriceffectwasfound.ThesamplesmadeofpurifiedGdexhibitfirstorderphasetransformation,andthe-ΔSmisbasicallyconsistentwiththepublisheddataofAmeslaboratory,USA.ThisworkprovesthatGd-Si-GealloysmadeofdomesticGdcanbeutilizedinmagneticrefrigerators.
简介:Thephasesandmagnetocaloriceffectinthealloys(Gd1-xErx)5Si1.8Ge2.2withx=0,0.1,0.2and0.3wereinvestigatedbyX-raydiffractionanalysisandmagnetizationmeasurement.ThesamplesweresinglephasewiththemonoclinicGd5Si2Ge2-typestructure.WiththeincreaseofErcontent,theCurietemperature(Tc)decreasedobviouslyfrom253Kofthealloywithx=0to114Kwithx=0.3.Themaximummagneticentropychangedinthesamplesof(Gd1-xErx)5Si1.8Ge2.2withx=0.0,0.1,0.2and0.3were6.88,8.32,9.59and10.24J·kg-1·K-1respectivelyintheappliedfieldchangeof0~2.0T.
简介:Arrayprocessingistoprocessthesignalscarriedbythepropagatingwavesreceivedatanarrayofsensors.Whenthesignalspropagatethroughthepracticalrandomtime-variantmedium,theirwavefrontscanshowtheprogres-sivelossesofcoherencewithincreasingspatialseparation.Thesedecorrelationsofwavefrontsresultinanangularspreadinthewavenumberspectrumcenteredaboutthetruesignaldircction-of-arrival.Thispaperputstheemphasisuponthearrayprocessingoftheangular-spreadsignalwhichiscalledtheGeneral-izedDirectional(GD)signalandaimstomatcharrayprocessingtothissignalmodelintheenergysense.Inthispaper,wealsopresentamethodofthecom-putersimulationorthegeneralizeddirectionalsignalmodel.Someresultsofcomputersimulationexperimentsandlake-tcstsinXinanjiangRiveraregiven.
简介:ThespeciationanddistributionofGd(Ⅲ)inhumaninterstitialfluidwasstudiedbycomputersimulation,Meantimeartificialneuralnetworkwasappliedtotheestimationoflogβvaluesofcomplexes,Theresultsshowthattheprecipitatespecies,GdPO4andGd2(CO3)3,arethepredominantspecies.Amongsolublespecies,thefreeGd(Ⅲ)[Gd(HSA)],[Gd(OX)]andthentheternarycomplexesofGd(Ⅲ)withcirtratearemainspeciesand[Gd3(OH)4]becomesthepredominantspeciesattheGd(Ⅲ)totalconcentrationof2.2×10^-2mol/L.