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argon-argon dating
氩-氩年代测定
利用中子活化法使样品中的39K经过39K(n,p)39Ar反应转化为39Ar,然后用质谱计测定其40Ar/39Ar的比值,代替通常在钾-氩法中的40Ar/40K比值,计算岩石或矿物的地质年龄。
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normal domain
normal domain of attraction
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normal dynamical system
normal education
normal eigenvalue problem
normal electron demand
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normal electron tunneling
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normal elliptic integral
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