Tetsuro Fukuda

Theoretical study on the effect of heterocycles reinforcing the layered structure

In order to elucidate the origin of different behaviors of amphiphiles at the air-water interface depending on the heterocycle incorporated, intralayer multipole-multipole electrostatic energy in a two-dimensional crystalline arrangement was calculated, simulating a monolayer. The calculated interaction energies well explain the actual behavior which shows the validity of this method in the molecular design of amphiphiles.

Operation of irrigation system and water management in low lying paddy area with creek network

Characteristics of the operation and management of irrigation systems were analyzed in the low lying paddy area with creek networks. The irrigation system in Kubota district was chosen as a suitable example for analyzing. The water use in the irrigation system is characterized by reuse of return flow from paddy fields to creeks utilizing those water storage functions. There is a time delay between the input water and run off in the creek network irrigation system. The complex tank model was, therefore, applied to analyze the system operation. It is clarified that the response of actual operation of the irrigation system due to rainfall depends on the drainage conditions affected by tidal phenomena of each block.