Some engineering researches on the experiments of the physical properties of the peat and on the sounding explorations of the peaty area,in Hokkaido,Japan,1.

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• The sound scattering cross section of a cylinder and a submarine model in water.
• Short-range deep-water transmission.
• The transmission of sound waves in shallow water.
• Refraction of sound by the sound channel in the ocean.
• The model experiments of the radar cross section of the aircraft by the ultrasonic wave in air.

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