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AdvanceintheStudiesandDevelopments
ontheResourcesofPistaciaChinensisBunge
LIUJie,YANGSong,SHAOSi-chang
(ChemistryDepartment,FuyangTeachersCollege,Fuyang236041,China)
Abstract:TheplantPistaciachinensisBungehasalreadycausedpeople'sgreatconcernandattention,becauseit'san
importantresourceofbiodieselandwidelyusedinmedicineandpesticide.Thispapermainlyreviewstheplantonfollowingaspects:morphology,distribution,chemicalcomponentsandthestudyofcomprehensiveutilization.Thedevelopingtrendandbroadapplicationprospectsofthisplantarealsodiscussed.
Keywords:PistaciachinensisBunge;chemicalcomponent;comprehensiveutilization(上接第15页)
EffectsofSecondaryElectronEmissionon
Non-collisionalSheath
ZHAOXiao-yun
(SchoolofPhysicsandElectronicScienceFuyangTeachersCollege,Fuyang,236041,China)
Abstract:Inthispaper,thebasicmodelofnon-collisionalplasmasheathisdeveloped.Theplasmaconsistsofelec-trons,positivelychargedionsandsecondaryelectronsfromthewall.Itisdiscussedthatsecondaryelectronemission(SEE)affectsthesheathstructureinsteadystateofonedimension.Thereareconclusionsthatthepotentialinthewallincreases
<Cc,thepotentialinthesheathincreaseswiththeSEEcoefficient,thesheathissheathofions.withtheSEEcoefficient.IfC
IfC<Cc,theelectricfieldisreverse,thereisaminimuminthesheathandthesheathisnotsheathofions.Andasforthewallconsistingofdifferentmaterialsforstationaryplasmathruster,itisdiscussedbrieflythatSEEaffectsthesheath.
Keywords:secondaryelectronemission(SEE);Bohmcriterion;sheath;potential