There are so many Isolated Islands (inhabited islands) in the world, including Japan. However, at present islanders, there have been faced with the decline of industries, serious concerns of rapid aging and very low birthrate without children and water scarcity issues etc. It can be said that these situations are under the environment which shows a microcosm of Japanese and/or world survival society in the near future. In this paper, the experimental data on the reduction of the mixed water (seawater & rainwater) salinity by the sound wave when changing the volume ratio were first shown, taking into the characteristics of the Isolated Islands. Next, the main analysis result on the water qualities of mixed water with which sound wave was irradiated was shown and the consideration mainly based on the WHO drinking water quality standards was carried out. Finally, through a simple water quality improvement apparatus using small hydroelectric power, a consideration regarding a possibility of the purification of the water (to be a drinking water) based on the solar circulation energy (regenerative type's natural energy) such as small hydropower utilization, natural sunlight utilization, natural gravity utilization, natural oscillation utilization has been described in the paper.
[abstFig src='/00280003/08.jpg' width=""300"" text='Arbitrary attitude hovering' ] The quad tilt rotor helicopter (QTRH), a tilt-rotor aircraft prototype, has fixed wings for long-range high-speed flight. Its rotor-tilt mechanism controls 4 rotor-tilt angles independently and controls its roll and pitch angles similarly to a multirotor helicopter. It controls yaw angle by thrust vectoring and moves forward and backward by tilting its rotors. Rotor-tilting maneuvers are the initial stage of flight-mode transition between helicopter and fixed-wing modes.
[abstFig src='/00280003/09.jpg' width=""300"" text='Thrust vectoring mechanisms for WRH' ] A quad rotor helicopter (QRH) is a radio controlled (RC) aircraft that tilts its attitude to generate a horizontal force component to move in a certain direction. Using autonomous control, the attitude control system tilts the airframe against disturbances, such as wind. Thus, the attitude of a flying QRH is always slanted. In this study, three types of deflecting thruster were compared to maintain the position and horizontal attitude of the QRH. The extra thrusters are tilted to generate a thrust against disturbances without causing the airframe to incline. It is suitable for precise measurements for which the airframe posture should remain horizontal.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.