This paper is mainly concerned with optimal harvesting policy for three competing species with age-dependent and diffusion.
本文主要研究具有扩散和年龄结构的三种群竞争系统的最优收获策略问题。
2
Some policy recommendations were put forward to facilitate clean technology adoption and diffusion in China regarding current environmental regulation framework.
针对我国目前的环境监管现状，本文为制定有助于清洁技术采纳和扩散的环境政策提出相应建议。
3
Then the environmental policy will directlyinfluence the decision-making in R&D. Endogenous technology in R&D will beexogenous variables in diffusion.