Hydrates have peculiar crystal structure that one guest molecule is surrounded with a cage composed by water molecules. These water molecules are connected by hydrogen bonding each other, but there is no chemical bonding between the guest molecule and the water molecules. In this paper I will mention the possibility of hydrate's application to solve environmental problems. The cage-like structure of hydrates can be utilized as an environmental pollutant gas separation method since in mixture hydrates the mole fraction of components in a hydrate phase is different from that in a gas phase. Firstly properties of hydrates concerning with the separation technology are summarized concisely. Then the separation technology with hydrates is introduced.

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The advanced treatment for the chips, industrial waste discharged from high speed grinding process (about 80ton/month), was investigated To confirm die separation technology of machine oil from chips, absorbing ahereateristics of kerosene for acetone vapor, absorption rate in bubbling layer and residence time in spray tower were measured Henry's constant and Sh-Re relations were calculated Residence time in spray tower of 200mm diameter and 2m height with three spraying nozzle was investigated

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The cross flow plate heat exchanger manufactured easily by only folding plates was considered. This heat exchanger can be manufactured without waste. Forming heat transfer surface into wavy, dimpled, or etc. by rolling make heat transfer improved. In this paper, the heat transfer surface is shaped into crossing wavy surface. Changing the angle of the apex, measurement of local coefficient of heat transfer and pressure loss and visualization of flow were made. The effect of shape of wave was made clear.

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Transient thermal stresses of a particle reinforced rectangular plate of a functionally graded material FGM during the fabrication process are analyzed. The model assumes that soft-ductile particles are distributed in a brittle matrix. We used thermo-elastic-plastic constitutive equation for a particle-reinforced composite taking temperature change and damage process into consideration. The effects of the particle distribution parameter and the maximum initial particle volume fraction on the stresses are discussed.

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