简介：LetRbeafinitechainringwithmaximalidealγandresiduefieldF,andletγbeofnilpotencyindext.ToeverycodeCoflengthnoverR,atowerofcodesC=(C:γ0)(C:γ)(C:γi)(C:γt-1)canbeassociatedwithC,whereforanyr∈R,(C:r)={e∈Rn|re∈C}.UsinggeneratorelementsoftheprojectionofsuchatowerofcodestotheresiduefieldF,wecharacterizecycliccodesoverR.ThischaracterizationturnstheconditionforcodesoverRtobecyclicintooneforcodesovertheresiduefieldF.Furthermore,weobtainacharacterizationofcycliccodesovertheformalpowerseriesringofafinitechainring.

简介：让G是为一套素数的一个可分离的组，让N是G的正常亚群，并且让是我特性(即，无法缩减的部分特性)N。我们为G的我特性的数字获得一个必要、足够的条件在上拿可能的最大的|G:N||G:N|

简介：LetRbeasimpleArtinianring,Mm×n（R）bethesetofallm×nmatricesoverR.GLn（R）bethesetofalln×ninvertiblematricesoverR.LetATbethetransposematrixofA∈Mm×n（R）.BytheWedderburn-Artintheorem,RbeisomorphictoatotalmatrixringMs×s（D）overadivisionringD.Letα→（α）DbeanisomorphismofRontoMs×s（D）,ifX=

简介：IntermsofERBEandISCCPdata.andmeasured/calculatedsurfacenetradiation,computationisperformedoftheclimaticcharacteristicsofANR(atmosphericnetradiation)acrossChinaalongsidewiththediscussionandrelationstoothertwokindsofradiationandcontributingfactors.EvidencesuggestsahighlinearcorrelationofANRwithatmosphere-absorbedshortwaveradiation.wherebycanbeestablishedageneralexpressionforANR,whichdecreasesmoresharplyasafunctionofaltitudeandincreasesslightlywithlatitudeinsummer,andchangesuniformlyinwinter.Eventually,acomparisonismadeofthefindingspresentedinthispaperandliteraturesregardingtheANRpatternandmagnitudes,indicatingtheirgreatdifference.

简介：Basedonmonthlyrainfalldatafrom80stationsofChinafortheperiodofJanuary1951—February1985analysedintermsofthemaximumentropyspectrumandEEOF(extendedempiricalorthogonalfunction)techniques,thespatialandtemporalfeaturesofquasi-biennialoscillation(QBO)intherainfallareinvestigatedinadetailedmanner,withsomeresultsofinterestacquired.HighlyevidentistheQBOinrainfalloverChina,especiallythemidandlowerreachesoftheChangjiangRiver,theNEsideoftheQinghai-XizangPlateau,NorthChina,thesouthernpartofNEChina,areassouthoftheChangjiangRiverandoftheNanlingmountainregion,andmostofXinjiang.ThespatialwavedescribedbythefirstandsecondeigenvectorsofEEOFforeasternChinaisatypeofwavetravellingfromNEtoSW,indicatingthecycleofpatterns(inthesouthtonorthdirection):dryness(D)-wetness(W)-dryness(D)→southernW-northernslightD→W-D-W→southernD-northernslightW→D-W-Dagain,withthefloodedregionbetweentheChangjiangandHuangheRiversfortheD-W-DoccurrenceandwiththeChangjiangRiverasthedivisionforthesouthernW-northernslightDhappening.Thethirdandfourtheigenvectorsshowastandingwave-likefeatureforthesameeasternpart,indicatingthecycleofD-W-D→transition→W-D-W→transition→D-W-D,again,wherethetransitionmeansthegeneralweakeningofdroughtandfloodingandtheirsubsequentreversaldevelopment.Theamplitudesofthetimecoefficientsofthefirsttwoeigenvectorsareoppositeinthetrendoftheirchangestothoseofthenexttwoandshowaperiodof10—14years.

简介：ThediagnosticmodelofthecumulusconvectionproposedbyYanaietal.(1973)wasappliedtotheatmosphereovertheTibetanPlateau,andusedtoestimatetheverticalmassflux,entrainmentanddetrainment,excesstemperatureandmoisture,liquidwatercontent,andcondensationandprecipitationratesofhighlandcloudclusters.TheresultsillustratedthatincloudsovertheTibetanPlateau,thewatervaporcondensationrate,liquidwatercontent,andefficiencyoftheraingenerationprocessarelessthanthoseinthetropics(representedbytheMarshallIslandsregion).Therefore,thecondensationallatentheatreleasedovertheTibetanPlateau,overall,ismuchsmallerthanthatinthetropics.Thewatervaporandliquidwaterdetrainmentfromshallownonprecipitatingcumulusclouds,andtheirentrainmentintodeepcumulusclouds,serveasagrowingmechanismforthedeepprecipitatingcumulustowersovertheTibetanPlateau.Itshouldbenotedthatthereisastrongerdetrainmentofliquidwater

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简介：DuetofastdevelopmentofChinesesteelindustry,continuousadjustmentofproduct,improvementofquality,researchofvalue-addedproduct,RHtechnologyissignificantlydeveloped.MoreandmoresteelplantsarecoveredwithRHfacilities.RHratioisgrowingrapidlyaswell.Overpastdecade,throughassimilatingadvancedforeigntechnologiesandfurtherrefiningthem,ChineselargescalesteelplantsmasterthetechnologyofRHproduction,operation,maintenanceandmakeitmorewidespread.RHfunctionsarewellappliedandimproved.RHismorewidelyeffectivelyputintouse.Throughindependentinnovation,RHcoredevicesandtechnology,suchasRHvacuumpump,oxygentoplance,vacuumvesselpreheatinglance,ladleliftingdeviceetc.haverealizedlocalization.Thedevelopmentofequipmentdesign,softwaredesign,equipmentmanufacturingtechnology,equipmentmounting,testtechnologyandEPCmanagementmakesequipmentconfigurationmoreflexible,equipmentmorefunctionalandstable,easiertooperateandmaintain.Italsoguaranteeshighlyeffectiveandlowenergyconsumptionproductionandqualityofsteel,reachesinternationaladvancedlevel,lowersthecostofRHconstructionandoperation,makesafter-sakeservicemoreconvenient.HowtocontinuouslyoptimizeanddevelopRHprocess,equipmentandcontroltechnology,inordertomeettheneedsofproductwithmorereasonableandeconomicprocess,exploitpotentialities,buildmoreeffective,lowercost,lowerenergyconsumption,protectingenvironmentRHfacilitieswillbethekeypointoffutureRHtechnologydevelopmentinChina.

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简介：Hygienesupervisionandcontroloverthemanufacturingplantssupplyingflightfood,thecabinservicedepartmentofAirChinaandfoodsupplyonaircrafthavebeenimplementedbytheBeijingAirportHealthandQuarantineBureau.Fifty—threespecificproblemsofvariouskindshavebeendetectedina12monthexperimentalperiodfromAugustof1991toAugustof1992.Thispaperhasdiscussedthelegalbasis,supervisionunit,workproceduresandworkcontentofsupervisionandcontroloveraircatering.

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简介：ＴＨＥＳＴＵＤＹＯＦＴＨＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＢＯＵＮＤＡＲＹＬＡＹＥＲＯＶＥＲＨＩＬＬＴＥＲＲＡＩＮＨａｏＷｅｉｆｅｎｇ（郝为锋），ＬｉｕＫａｉ（刘凯）（ＭｅｔｅｏｒｏｌｏｇｉｃａｌＣｏｌｌｅｇｅｏｆＡｉｒＦｏｒｃｅ，Ｎａｎｊｉｎｇ２...

简介：ThestrontiummodifiedwasteFCCcatalystwaspreparedbymagneticstirringmethodandcharacterizedbyXraydiffractometry(XRD),UV-Visdiffusereflectancespectrometry(DRS),X-rayphotoelectronspectroscopy(XPS)andscanningelectronmicroscopy(SEM).Meanwhile,itsphotocatalyticdenitrogenationperformancewasevaluatedintermsofitsabilitytodegradetheN-containingsimulationoilundervisiblelight.Amixtureofstrontiumnitratesolution(withaconcentrationof0.5mol/L)andwasteFCCcatalystwascalcinedat400℃for5hpriortotakingpartinthephotocatalyticdenitrogenationreaction.ThetestresultsshowedthatthephotocatalyticdegradationrateofpyridinecontainedinsimulationoilinthepresenceofthestrontiummodifiedFCCcatalystcouldreach92.0%undervisiblelightirradiationfor2.5h.

简介：Inanymodernsocietyundertheroleoflaw,thecourt,astheorganoftrials,invariablyhasitsauthorityrecognizedbytheconstitutionandlaws,anauthoritythatthegeneralpublicacceptsasamatterofcourse.Sentencesandrulingspassedbythecourtrepresentrecognitionoftherelevantlegalmattersinaccordancewiththelaw,andtheirexecutionisguaranteedbythecompulsorypowerofthestate.Nevertheless,judgesarehumanbeingsand,

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简介：Thewave-seabedinteractionissueisofgreatimportanceforthedesignoffoundationaroundmarineinfrastructures.Mostpreviousinvestigationsforsuchaproblemhavebeenlimitedtouncoupledoronewaycoupledmethodsconnectingtwoseparatedwaveandseabedsubmodelswiththecontinuityofpressuresattheseabedsurface.Inthisstudy,astronglycoupledmodelwasproposedtorealizebothwaveandseabedprocessesinasameprogramandtocalculatethewavefieldsandseabedresponsesimultaneously.Theinformationbetweenwavefieldsandseabedfieldswerestronglysharedandthusresultsinamoreprofoundinvestigationofthemechanismofthewave-seabedinteraction.Inthisletter,thewaveandseabedmodelswerevalidatedwithpreviousexperimentaltests.Then,asetofapplicationofpresentmodelwerediscussedinpredictionofthewave-inducedseabedresponse.Numericalresultsshowthewave-inducedliquefactionareaofcoupledmodelissmallerthanthatofuncoupledmodel.

简介：AlthoughChina’scoreinterestsintheMiddleEastareeconomic,theseareinterwovenwithitsotherinterestsincludingthoseintheareasofpolitics,strategy,securityandoverseasinterests.Becauseofthesignificantgapbetweenitsinterestsanditsinfluence,ChinashouldadoptanewstrategyintheMiddleEast,onethatisdifferentfromthosethatotherpowershaveemployedintheregion.