简介：Inthispaper,weintroducethenotionofexcellentextensionsofrings.LetFbeanexcellentextensionofanArtinalgebra∧,weprovethat∧satisfiestheGorensteinsymmetryconjecture(resp.,finitisticdimensionconjecture,Auslander-Gorensteinconjecture,Nakayamaconjecture)ifandonlyifsodoesF.Asaspecialcaseofexcellentextensions,whenGisafinitegroupwhoseorderisinvertiblein∧actingon∧and∧isG-stable,weprovethatiftheskewgroupalgebra∧GsatisfiesstrongNakayamaconjecture(resp.,generalizedNakayamaconjecture),thensodoes∧.

简介：NorthwestElectricPowerDesignInstitute(NWEPDI)wasestablishedin1956.Theinstituteundertakestheengineeringexploration,surveyanddesignofthermalelectricpowerplant,conventionalislandofnuclearpowerplant,powertransmissionandsubstationprojects,designofthe1stand2ndclasspressurevessels,electricpowersystemplanning,environmentalprotectionengineeringmonitoring,assessmentanddesign,variousindustrialandcivilarchitecturaldesignandthescicntificresearchandtechnicaldevelopmenttasksofcorrespondingspecialities.Theinstituteis

简介：NearlyoneinfiveU.S.workersclaimstobeinexcellenthealth——despitebeingoverweight,smoking,drinkingtoomuchorneverexercising,accordingtoanewlypublishedsurvey.Inthenationwidestudyof1,450employedadultsreleasedbyOxfordHealthPlansInc.,17percentdescribedtheirhealthasexcellentbutdisplayednot-so-excellenthabits.Ofthosepeople,55percentsaidtheywereatleast25pounds(11kg)overweight,choolardenfgh31percentsmoked,21percentdrankatleastthreeglassesofalcoholaday,29per...

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简介：IntroductionExtensiveReading,asthenameindicates,isaguideforstudentsintothevastseaofknowledge.Readingdemonstratestostudentsthatthereisnoendinlearningknowledge.However,readingandlanguagelearningbasedontextbooksisfarfromenoughbecausetheknowledgefromthemistoonarrow,thevocabularyistoolimitedandthecontentsarenotcurrentenoughinthesetimesofinformationexchange.Throughoutmyteachingexperiments,Ihavefoundthatnewspaperclippingscanbecomeaverygoodwaytobringmorebenefitstostudents’learningthanIexpected.Itcanbroadenthestudents’horizons,

简介：Inthisarticle,weshowthatifXisanexcellentsurfacewithrationalsingularities,theconstantsheafQeisadualizingcomplex.IncoefficientZe,wealsoprovethattheobstructionforZetobecomeadualizingcomplex,liesonthedivisorclassgroupsatsingularpoints.Asapplications,westudytheperversesheavesandtheweightsof-adiccohomologygroupsonsuchsurfaces.

简介：Asimpleroutetosynthesizethepolyaniline(PANI)nanofiberswithdiameterabout150nmwasreported.Inthisstrategy,thePANInanofiberswerefabricatedbyelectrochemicaldepositionbyusingtwo-electrodeconfigurationin0.01Manilineand0.01MH2SO4electrolytes.Theas-preparedmaterialswerecharacterizedbyscanningelectronmicroscopy(SEM),infraredspectroscopy(FTIR),Ramanspectroscopyandthermogravimetricanalysis(TGA).TheelectrochemicalpropertiesofthePANInanofiberselectrodeassupercapacitormaterialswereinvestigated.ThePANInanofiberselectrodeshowedhighcapacitanceof485F·g-1at0.1A·g-1,andthedecreaseinthespecificcapacitanceisabout3.5%in1000cycles.TheresultsindicatethatthePANInanofiberselectrodeshowshighstabilityandretainsitselectrochemicalcapacitancepropertyover1000cycles,suggestingPANInanofibershavepromisingapplicationsinhigh-performancesupercapacitors.

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简介：Inthepresentstudy,themarketneedsforthedevelopmentofsteelplateswithexcellentheataffectedzone(HAZ)toughnessareanalyzed,andthemechanismofthedecreaseintheHAZtoughnessduringhigh-heatinputweldingisdiscussed.TheimportantcountermeasureforimprovingtheHAZtoughnessistoemploythetechnologyofoxidemetallurgy,namely,tomakeuseoffineinclusionparticlesforimprovingthemicrostructureofHAZ.TheprogressandtheoriesofoxidemetallurgytechnologiesdevelopedintheNipponSteelCorporation(NSC),theJFESteelCorporationandtheKobeSteelGroupareillustrated.SteelplatesdevelopedbythesethreecompanieswithexcellentHAZtoughnessareintroduced.

简介：AnovelInGaAs/InAlAscoupledquantumwellstructureisproposedforlargefield-inducedrefractiveindexchangewithlowabsorptionloss.Inthecaseoflowappliedelectricfieldof15kV/cmandlowabsorptionloss(±≤100cm-1),alargefield-inducedrefractiveindexchange(fortransverseelectric(TE)mode,△n=0.012;fortransversemagnetic(TM)mode,△n=0.0126)isobtainedinthestructureattheoperationwavelengthof1.55μm.Thevalueislargerbyoveroneorderofmagnitudethanthatinarectangularquantumwell.Theresultisveryattractiveforsemiconductoropticalswitchingdevices.

简介：Inrecentyears,theconcernaboutenvironmentalprotectionisincreasingonaworldscale.MajormanufacturersofhomeappliancesandOAequipmenthaveintroducedso-called'greenprocurementschemes'forreducingenvironmentallyharmfulsubstancesinmanufacturingprocessandendproducts.Undersuchbackground,anewtypeofchromate-freeorganiccompositecoatedelectro-galvanizedsteelsheetwithhighconductivitywasdevelopedbyBaosteel,whichmeetstheEURoHSDirective(RestrictionoftheHazardousSubstances)andotherrelatedlawsandregulationsonenvironmentalsafety.Italsoprovidesexcellentsurfaceelectricalconductivity,corrosionresistance,fingerprintresistance,solventresistance,coatingadhesion,heatresistance,formabilityandotherspecialpropertiestomeetthedemandofmanufacture’sprocessofOAmachine.Comparedwithpreviouslydevelopedanti-fingerprintingcoatedelectro-galvanizedsteelsheet,thisnewlydevelopedproducthasagoodbalancebetweenhighcorrosionresistance(timeto5%whiterustinsaltspraytestis120hforflatpaneland72hforworkedpotion)andconductivity(surfaceelectro-resistivityinaccordancewithLOREASTislessthan0.1milliohm)duetothespecialdesignofcoating’sstructure.Besides,Italsoprovidesthepropertiesofgroundingandshieldingagainstelectromagneticwaves.Theevaluationofsurfaceperformancesofnewproductshowedthatitiscomparableorevenbetterthanthesimilarproducts.Currently,thenewlydevelopedproducthasbeencommercialized.Inthispaper,themajorpropertiesarediscussed,suchascorrosionresistance,surfaceelectricalconductivity,fingerprintresistance,solventresistance,coatingadhesion(ink/melaminealkydpaint),heatresistanceandformability.Furthermore,theapplicationisalsobrieflydescribed.

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简介：Hydrousrutheniumoxide（h-RuO2）nanoparticlesanditscompositewithmultiwalledcarbonnanotubes（h-RuO2/MWCNT）weresynthesizedbyasimplehydrothermalmethodandprovedtohavepotentialapplicationashybridsupercapacitormaterial.Theh-RuO2andh-RuO2/MWCNTwerecharacterizedfortheirphysico-chemicalpropertiesbyPXRD,BETsurfacearea,Raman,SEM-EDSandTEMtechniques.Theelectrochemicalperformanceofthematerialswereinvestigated,specificcapacitance（Cs）ofh-RuO2andhRuO2/MWCNTestimatedbytheircyclicvoltammetricstudieswerefoundtobe604and1585F/grespectivelyatascanrateof2mV/sinthepotentialrange0–1.2V.Further,thisvaluewasfoundtobenearlythreetimeshigherthanthatofpureh-RuO2.Anasymmetricsupercapacitor（AS）devicewasfabricatedbyemployingh-RuO2/MWCNTasthepositiveelectrodeandactivatedcarbonasthenegativeelectrode.ThedeviceexhibitedCsof61.8F/gatascanrateof2mV/s.Further,thedeviceshowedexcellentlongtermstabilityfor20,000cycleswith88%capacitanceretentionatahighcurrentdensityof25A/g.

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简介：Inthispaper,carbonmicrospherepreparedbyhydrothermaltreatmentwasactivatedbyKHCO3athightemperature,andemployedasthecatalystforVO2+/VO2+redoxreactionforvanadiumredoxflowbattery(VRFB).CarbonmicrospherecanbeetchedbyKHCO3duetothereactionbetweenthepyrolysisproductsofKHCO3andcarbonatoms.Moreover,KHCO3activationcanbringmanyoxygenfunctionalgroupsoncarbonmicrosphere,furtherimprovingthewettabilityofcatalystandincreasingtheactivesites.Theelectrocatalyticpropertiesofcarbonmicrospherefromhydrothermaltreatmentareimprovedbyhightemperaturecarbonization,andcanfurtherbeenhancedbyKHCO3activation.Amongcarbonmicrospheresamples,theVO2+/VO2+redoxreactionexhibitsthehighestelectrochemicalkineticsonKHCO3activatedsample.ThecellusingKHCO3activatedcarbonmicrosphereasthepositivecatalystdemonstrateshigherenergyefficiencyandlargerdischargecapacity,especiallyathighcurrentdensity.TheresultsrevealthatKHCO3activatedcarbonmicrosphereisanefficient,low-costcarbon-basedcatalystforVO2+/VO2+redoxreactionforVRFBsystem.

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