简介:摘要随着信息化建设的快速发展,信息技术在单位信息管理中得到深人应用,各行各业越来越依赖利用信息系统来加强单位信息管理。但是近年来,针对信息技术的网络攻击频繁发生,给信息保密安全带来严重威胁。基于此,本文主要对建立信息安全“四个体系”筑牢保密工作坚强防线进行分析探讨。
简介:Thenear-ultraviolet(n-UV)excitedblue-emittingSr2MgSi2O7:Eu2+phosphorsareusedforfluorescencelampandtricolorwhiteLEDs.Theeffectofnitrogen-dopedonthestructureofthehostandtheenhancementofphotoluminescenceisexperimentallyinvestigated.Theresultsshowthatastheamountofnitrogen-dopedvariesfrom0to0.6(at.),theluminousintensityisfoundtobeincreasedto169%,andthepartialreplacementofObyNresultsinachangeofthecrystalfieldbymodifyingthesymmetryofthecrystalstructure.Asaresult,withthenitrogen-dopedinsmallamount,theluminousintensity,chromaticitycoordinatesandthecolorpuritycanbeadjustedtoadesiredvalueintheapplications.