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A structural one-part epoxy adhesive with excellent adhesive properties and durability was developed for aluminum alloy, which is regarded as a material suitable for reducing the body weight of automobiles. As a result of investigations of surface treatment, the oxide layer, surface finishing, and adhesion properties of aluminum alloy, it was found that adhesion durability varies widely depending on the surface condition of the aluminum alloy. It was also learned that by subjecting the aluminum alloy to surface treatments such as etching, adhesion durability was greatly improved. It is expected that the use of aluminum alloy in automobiles will become widespread in the future. Undoubtedly, these adhesion technologies will become an extremely effective technique for joining automotive body panels made of aluminum alloy.

Hybrid laminar flow control (HLFC) is one of the most practically promising aircraft drag reduction technologies. We have investigated both numerically and experimentally aerodynamic characteristics of HLFC airfoil and wing at high subsonic, high Reynolds number conditions. In this paper we report the result of a wind tunnel test on drag characteristics of two-dimensional HLFC airfoils with porous and slot suction approach under some adverse factors against laminar flow, and a numerical analysis of the wind tunnel data, which is based on the boundary layer calculation with new transition prediction method allowed for the adverse factors and the Squire-Young drag formula.