A novel clock period selection algorithm is proposed.

Application of the optimal-cycle-selected model for product innovation in the avoidance of risk related with accelerated innovation;

In the view of the economic theory of demand elasticity and intertemporal choice, there is an urgent need to establish petroleum reserve in China.

Intertemporal choice have drawn the researchers attentions and have made much progress.

Then, from the perspective of quality growth and intertemporal choice, this paper uses empirical study tools to find that how the quality growth\'s velocity and the intertemporal substitution influences consumer behavior and the accurate role.

Growth variation of Picea koraiensis and early selection;

On the basis of review of sexual improvement,the paper discusses the possibility for clone improvement and corresponding key issues,such as establishing of breeding groups,determining of early selection age and improving of clone propagation.

By sixyear investigation into survival rate of forestation,growth,primary form quality and character,adaptability and ability to insectresistance and diseaseresistance,their status of heredity and variance have been primarily mastered,which provides scientific foundation for early selection of heredityimproved of poplar.