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In this paper,an equivalent canonical form VARTMA of multiple time series models is obtainedby using the polynomial matrix theory,which may lead to converting the parameter estimation problemof the simultaneous equations into that of the single equation in modeling.It it proved that a VARMAmodel can be turned into the unique VARTMA form by means of the equivalence transformation,andthe character of the transformed model is not changed at all. 相似文献
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用扭摆及静电音频内耗仪研究了CuO在100~160K的内耗行为,实验结果表明在该温区存在一激活能为0.2eV的弛豫峰,而CuO的介电行为研究也表明在此范围有一弛豫峰,激活能为0.21eV。实验还进一步说明高温超导材料在该温区的反常行为与CuO无关。 相似文献
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