简介:Airpressureistheforceexertedonyoubytheweightoftinyparticlesofair(airmolecules).Althoughairmoleculesareinvisible,theystillhaveweightandtakeupspace.Sincethere’salotof"empty"spacebetweenairmolecules,aircanbecompressedtofitinasmallervolume.
简介:1.IntroductionThisarticlepresentsindetailthehistory,evolutionandreorganizationoftheBigFouralongwithpresentingthefutureofthefirms.Asweallknow,theBigFouristhenamegiventothetopfourprofessionalconsultancyfirmsoftheworldnamelyPwC(PriceWaterhouseCoopers),KPMG,ErnstandYoungandDeloitte.Thesefirmsprovideaudit,accounting,taxation,financialandotherprofessionalconsultancytotheclients(beingbusinessesandcompanies).ThediscussionsbelowisthehistoryofthesefirmsincludingthereasonofformationoftheBigFourandtheirjourneytowardsbeingbigfour.2.TheHistoryoftheBigFour–TheBigEightThisnamewasgiventotheeighttopmostauditandaccountingfirmsoftheworldinthebeginningofthetwentiethcentury.BeforetheirevolutionastheBigFour,theBigEightcomprisedofthefollowingaccountingandauditingfirms
简介:Tokeepthesecrecyperformancefrombeingbadlyinfluencedbyuntrustedrelay(UR),amulti-URnetworkthroughamplify-and-forward(AF)cooperativeschemeisputforward,whichtakesrelayweightandharmfulfactorintoaccount.Anonzero-sumgameisestablishedtocapturetheinteractionamongURsanddetectionstrategies.Secrecycapacityisinvestigatedasgamepayofftoindicatetheuntrustedbehaviorsoftherelays.Themaximumprobabilitiesofthebehaviorsofrelayandtheoptimalsystemdetectionstrategycanbeobtainedbyusingtheproposedalgorithm.
简介:Objective:Toexaminefactorsoftheyouthphysicalactivitypromotion(YPAP)modelthatareassociatedwithChineseinternationalstudents'meetingPArecommendations(MPAR).Methods:Atotalof649(females=320,males=329)Chineseinternationalcollegestudentsparticipatedinthestudy.ThisstudywasconductedintheUnitedStates(US.)betweenJuneandAugustin2011.Participantscompletedanonlinesurveyregardingtheirdemographic,PA,predisposing,enabling,andreinforcingfactors.Results:Logisticnested-regressionanalysissuggestedthatbeingmale,havingahigherbodymassindex,perceivedcompetence,self-efficacy,attitude,andenjoymentallincreased(p<0.001)theparticipants'oddsofMPAR.Exceptlanguagebarriers,alloftheenablingandreinforcingfactorspredictedMPARindirectlythroughthepredisposingfactors(p<0.001).Conclusion:UnderstandingfactorsthatinfluencePAamongChineseinternationalstudentsisanimportantstepintheprocessofpromotingtheirlong-termhealthandwellbeing.Designingprogramthataddresstheidentifiedkeyfactorsmayhelpcollegesanduniversitiesachievethisgoal.