简介:Writealettertoyourfriend,tellingherthemeasurestakentoimprovethestandardofEnglishinyourschool.DearSusan,Howareyougettingon?IthasbeenalongtimesinceIlastwrotetoyou.Pleasesendmyregardstoyourfamily.Ihopeyouareingoodhealth.
简介:InthispaperwemainlydiscussthatSAGBIbasisundercompositionofpolynomials.Poly-nomialcompositionistheoperationofreplacingthevariablesofapolynomialwithotherpolynomials.Themainquestionofthispaperis:DoesthereexistsadecisionprocedurethatwilldeterminewhetberagivencompositioncommuteswithSAGBIbasiscomputationunderagiventermordering?Wewillgiveabetteranswer(usingelementaryrationalrowtransformationsofmatrice).
简介:Theeffectsofpolishingonproximatecompositions,physico-chemicalcharacteristics,mineralcompositionsandantioxidantpropertiesofthericefloursobtainedfromthreedifferentpigmentedricevarieties(Chak-haoAngangba,Chak-haoAmubiandChak-haoPoireiton)wereinvestigated.Thericevarietiesweresignificantly(P<0.05)differentinthecontentsofthetestcharacteristics.Lipids,ash,minerals,phytochemicals(phenolicacidsandflavonoids)and2,2-diphenyl-1-picrylhydrazyl(DPPH)activityofricefloursweredecreasedafterpolishing(9%degreeofmilling),whileamylosecontentandlightnesswereincreased.X-raydiffractionpatternofricefloursexhibitedA-typecrystallinepatternwithreflectionsat15.1o,17.1o,18.2oand23.0o.Pastingpropertiesandtransitiontemperaturesweredecreasedafterpolishingtreatment.Polishingresultedinchangesinthecrystallinity,enthalpyandmorphologyofriceflours.
简介:Compositionistheoperationofreplacingvariablesinapolynomialwithotherpolynomials.Themainquestioninthispaperis:whendoescompositioncommutewithuniversalGroebnerbasiscomputation?Weprovethatthishappensiffthecompositionissinglevariable.ThishasanaturalapplicationinthecomputationofuniversalGroebnerbasesofcomposedpolynomials.
简介:NecessaryandsufficientconditionsareestablishedforacompositionoperatorCf=fotobeboundedorcompactontheBers-typespaceHaandthelittleBers-typespaceHaTheboundednessandcompactnessofthecompositionoperatorConA()arecharacterized,whichgeneralizethecaseofConHa.
简介:<正>Inthispaper,westudycompositionoperatorsonaBanachspaceofanalyticfunctions,denotedbyX,whichincludestheBlochspace.ThisspacearisesnaturallyasthedualspaceofanalyticfunctionsintheBergmanspaceL_a~1(D)whichadmitanatomicdecomposition.Wecharac-terizethefunctionswhichinducecompactcompositionoperatorsandthosewhichinduceFredholmoperatorsonthisspace.Wealsoinvestigatewhenacompositionoperatorhasaclosedrange.
简介:Forworkflow-basedservicecompositionapproach,therelationsbetweentheWebserviceQoSandenvironmentsareusuallynotconsidered,sothattheinformationaboutQoSforcompositeserviceselectionisinaccurate.Itmakestheselectedcompositeserviceinefficient,orevenunexecutable.Toaddressthisproblem,anovelservicecompositionapproachbasedonproductionQoSrulesisproposedinthispaper.Generally,itisverydifficulttodirectlyanalyzehowdifferentkindsofenvironmentfactorsinfluencetheWebserviceQoS.Weadopt'black-box'analysismethodofoptimizingcompositeservices,discoveringtheknowledgesuchas'theQoSofoneWebservicewillbehigherinspecificenvironments'.Inourapproach,theexecutioninformationofthecompositeserviceisrecordedintoalogfirst,whichwillbetakenasthebasisofthesubsequentstatisticalanalysisanddatamining.Then,thetimelyQoSvaluesoftheWebservicesareestimatedandtheproductionQoSrulesbeingusedtoqualitativelyexpressthedifferentperformancesoftheWebserviceQoSindifferentenvironmentsaremined.Atlast,weemploytheminedQoSknowledgeoftheWebservicestooptimizethecompositeserviceselection.Extensiveexperimentalresultsshowthatourapproachcanimprovetheperformanceofselectedcompositeservicesonthepremiseofassuringtheselectingcomputationcost.