简介:Today,themajoractivitiesininternationaltrade,investment,transnationalcorporationbusinessandhightechniquehappeninandbetweenNorthAmerica,EuropeandEastAsia.Thisemerging"NewTriangle"becomesquiteaphenomenonincurrentinternationalrelations.Withthisasthebackground,whatkindoftheorywillEuropeanregionalismadopt?Whataretheproblemsandchallengesonitstargetandprinciple?Moreover,whatinfluencesitmighthaveto"theNewTriangle"?Thesearetheproblemstowhichtheauthortriestofindanswersinthispaper.
简介:Howtocontrolmeltcompositionisthekeyforgettinghighqualityalloymelt.Thepapermadethefollowingefforts:(1)TheactivitycoefficientsinTi-15-3melthavebeencalculated.(2)Takingadvantageoftheactivitycoefficients,theevaporationlossesofcomponentsinTi-15-3meltduringISMprocesshavebeenstudied.Thecalculatedresultsshowthatthereisacriticalvacuumdegree(about1.33Pa)duringmeltingprocess.
简介:TheISMbandat2.4GHzhasmostlybeenusedorplannedforindoorsystems.Thisbandisalsoattractiveforoutdoorsystemsowingtotheeaseofthesystemdeployment,asnofrequencylicensesarerequired.Inthispaper,amultiplesuccessiveinternalmultireflectionmodelisusedtoestimatethecomplexelectricpermittivityat2.4GHzband.Toobtainthedata,measurementsareperformedat160MHzbandwidthcenteredabout2.4GHzusingavectornetworkanalyzer,whichprovidesinformationabouttheamplitudeandphaseoftransmissioncoefficient.Severalsamplesofeachmaterialaremeasuredandtheresultsvaryfromsampletosample.Ithasalsobeenfoundthatsomeobstacleshavepolarizationbehaviour.