Objective:To study the content change of the main components of the essential oil from Houttuynia cordata Thunb. during daytime, and to ascertain the optimal harvesting time.
目的研究鱼腥草挥发油中主要化学成分在一天中日照时间段的含量变化情况，确定适宜的采收时间。
The optimal harvesting problem for a semi-linear age-dependent time-varying population system is discussed.
讨论了年龄相关的半线性时变种群系统的最优捕获控制问题。
The optimal harvesting problem for a semi-linear age-dependent time-varying population system is discussed.
讨论了年龄相关的半线性时变种群系统的最优捕获控制问题。
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