简介:ELNet是一种新型网络学习平台,基于Portlet并集成于eXoPortal.ELNet体现了下一代E-Learning平台的思想和技术框架,实现了教育信息化的信息集成,提供了统一的信息访问渠道、强大的内容管理能力、协作及共享、个性化的应用服务和安全性保障等功能.
简介:ItseemsthatthewritingofarticlesInEnglishIsextremelyuneasyforstudentsofsecondfan-guaaelearning.AuditIsdifficultInatleastthreeaspects:l.ThestudentsnndItbardtochoose‘enougll’wordsorphrasesorexpressionstocomposea‘good’writing.
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:现代生物学实验技术是生物科学专业研究生的必修课程之一。教学改革的目的是突出以教师引导为主线、以拓展学生的视野并与国际接轨为主体、通过充分运用课堂讲授和E-learning教学平台系统的各自优势,培养学生的创新意识和创新能力,培养学生综合运用基本的生物学实验技术并设计课题的能力。
简介:BaFe12O19fiberswaspreparedviaanaqueoussol-gelprocessusingFe(OH)(HCOO)2synthesizedinlaboratoryandBa(CH3COO)2astheoriginalmaterialsandcitrateasthechelate.Therheologicalbehaviourofspinnablesolwascharacterizedonrheometer,andthedevelopmentofgelfiberstobariumferritefiberswasstudiedbyIR,TGandXRD.MorphologyobservationofthefiberswasgivenonSEM,andthediameteroftheobtainedfiberswasbetween5and10μmcorrespondingtodifferentadditives.Theadditivesaffectedthesurfacetensionoftheprecursorsolwhichhadcloserelationtothemicrostructureoffibers.Sucroseandhydroxyethyliccellulosecouldimprovethesurfacetensionwhilediethanolamineandhexadecylaminereducethatoftheprecursorsol.Andusingdiethanolamineorhexadecylamineasanadditive,well-structuredBaFe12O19fiberscouldbeobtained.