简介:OnMarch26,2010anunderwaterexplosion(UWE)ledtothesinkingoftheROKSCheonan.TheofficialMultinationalCivilian-MilitaryJointInvestigationGroup(MCMJIG)reportconcludedthatthecauseoftheunderwaterexplosionwasa250kgnetexplosiveweight(NEW)detonationatadepthof69mfromaDPRK'CHT-02D'torpedo.KimandGitterman(2012a)determinedtheNEWandseismicmagnitudeas136kgatadepthofapproximately8mand2.04,respectivelyusingbasichydrodynamicsbasedontheoreticalandexperimentalmethodsaswellasspectralanalysisandseismicmethods.ThepurposeofthisstudywastoclarifythecauseoftheUWEviamoredetailedmethodsusingbubbledynamicsandsimulationofpropellersaswellasforensicseismology.Regardingtheobservedbubblepulseperiodof0.990s,0.976sand1.030swerefoundincaseofa136NEWatadetonationdepthof8musingtheboundaryelementmethod(BEM)and3Dbubbleshapesimulationsderivedfora136kgNEWdetonationatadepthof8mapproximately5mportsidefromthehullcenterline.Hereweshowthroughanalyticalequations,modelsand3Dbubbleshapesimulationsthatthemostprobablecauseofthisunderwaterexplosionwasa136kgNEWdetonationatadepthof8mattributabletoaROKlittoral'landcontrol'mine(LCM).
简介:本文通过叙述“11.26”地震谣传事件的形成及其在当地党委、政府有力指挥下,迅速予以平息,确保社会安定稳定。闸述了产生地震谣传事件的主要原因以及由此引发深思的若干问题:
简介:【摘要】《教育部关于进一步加强和改进师德建设的意见》中指出:加强和改进师德建设是全面贯彻党的教育方针的根本保证,教师是人类灵魂的工程师,是青少年学生成长的引路人。教师的思想政治素质和职业道德水平直接关系到大中小学德育工作状况和亿万青少年的健康成长,关系到国家的前途命运和民族的未来。《小学音乐新课程标准》强调德育教育在音乐学科教育环节的渗透,对学生道德、行为、人生观、世界观等的培养上,强调要改进教学方法,注重实践