In this paper we formulate an epidemic model with chronological age and infectious age structure.
本文根据流行病的传染过程和机理建立了具有年龄和病程结构的流行病模型。
In order to accurately simulate the labor age structure, this paper USES the OLG method and establishes a recursion model that relatively impairs the age changes.
为了更准确地模拟职工年龄结构的变化，本文采用OLG方法，建立年龄变化相对稳定的职工人数递推模型。
Consistence between isotopic model age of lead ore and intrusion age of quartz porphyry shows close relations among structure movements, magmatism and mineralization in Stage of Yenshan.
矿石铅同位素模式年龄和石英斑岩体侵入年龄的一致性反映燕山期构造、岩浆和成矿作用的密切关系。
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