简介:文章引入了(L,M)-fuzzy层次拓扑空间范畴,讨论了它与L-fuzzy层次拓扑空间范畴的关系,证明了(L,M)-fuzzy层次拓扑空间范畴、(L,M)-fuzzy层次邻域空间范畴、(L,M)-fuzzy层次闭包空间范畴以及(L,M)-fuzzy层次内部空间范畴等均是等价的。
简介:BaFe12O19fiberswaspreparedviaanaqueoussol-gelprocessusingFe(OH)(HCOO)2synthesizedinlaboratoryandBa(CH3COO)2astheoriginalmaterialsandcitrateasthechelate.Therheologicalbehaviourofspinnablesolwascharacterizedonrheometer,andthedevelopmentofgelfiberstobariumferritefiberswasstudiedbyIR,TGandXRD.MorphologyobservationofthefiberswasgivenonSEM,andthediameteroftheobtainedfiberswasbetween5and10μmcorrespondingtodifferentadditives.Theadditivesaffectedthesurfacetensionoftheprecursorsolwhichhadcloserelationtothemicrostructureoffibers.Sucroseandhydroxyethyliccellulosecouldimprovethesurfacetensionwhilediethanolamineandhexadecylaminereducethatoftheprecursorsol.Andusingdiethanolamineorhexadecylamineasanadditive,well-structuredBaFe12O19fiberscouldbeobtained.