简介:摘要:板块模型问题是高中物理问题中重点和难点问题,因为它可以涉及高中物理中的核心知识点和核心物理思想和方法。可以说,学懂了板块模型问题,也就掌握了高中物理的核心思想和方法。
简介:BymeansofthefrozentimeapproachandtheKroneckerproduct,twocriteriaofasymptoticstabilityarederivedforthelinear,timevariantdynamicsystemswitheithershorttimedelaysorwithweakfeedbackinvolvingarbitrarytimedelays,respectively.Itisfoundthattheasymptoticstabilityoftheseretardeddy-nainicsystemsisgovernedbythemaximalandminimalsingularvaluesofthecoeffi-cientmatricesandtheirtimederivatives.
简介:The32ndsessionoftheInternationalGeologicalCongress(IGC)willbeheldinFlorence,Italy,onAugust20-28,2004.ItwillbethesecondtimeforItalytohosttheIGC,thefirstoccasionhavingbeenthe2ndIGCsession,heldinBolognain1881.Intheintervening124years,Italiangeoscienceshavemadegreatprogressandhavegainedaleadingpositioninmanyfields.SituatednearthemiddleoftheMediterraneanSea,Florencewill