简介:黑龙江巩佳梦:我非常喜欢16期里那篇《猫狗情怀》,这让我想起与小白(我的爱猫)在一起时的快乐时光--我写作业的时候,它总是躺在我双腿上睡觉,冬天还会钻到我被窝里缩在我身边。不幸的是,它的生命已经走到了尽头。直到它离去,我
简介:TheJOURNALOFANCIENTCIVILIZATIONS(JAC)ispublishedannuallybytheInstitutefortheHistoryofAncientCivilizations(NortheastNormalUniversity,Changchun,JilinProvince,ThePeople’sRepublicofChina).
简介:DifferentfromthePalaceMuseuminBeijing,thebuildingsatShenyangPalacehaveuniquenationalandlocalcharacteristics.DominatedbythearchitecturalstyleoftheManpeople,wholivedinNortheastChina,theyincludedthearchitecturalstructureanddecorationmethodsoftheMongolian,Tibetan,Hanandotherethnicgroups.
简介:TheextendedcanonicalNoetheridentitiesandcanonicalfirstNoethertheoremderivedfromanextendedactioninphasespaceforasystemwithasingularLagrangianareformulated.UsingthesecanonicalNoetheridentities,itcanbeshownthattheconstraintmultipliersconnectedwiththefirst-classconstraintsmaynotbeindependent,soaquerytoaconjectureofDiracispresented.BasedonthesymmetrypropertiesoftheconstrainedHamiltoniansysteminphasespace,acounterexampletoaconjectureofDiracisgiventoshowthatDirac'sconjecturefailsinsuchasystem.WepresenthereadifferentwayratherthanCawley'sexamplesandother'sonesinthatthereisnolinearizationofconstraintsintheproblem.Thisexamplehasafeaturethatneithertheprimaryfirst-classconstraintsnorsecondaryfirst-classconstraintsaregeneratorsofthegaugetransformation.