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History <a href=" http://www.plasconspaces.co.za/inspire/ ">generation can you buy orlistat online holiday</a> It works in a quite simple fashion. Waves of ultrasound are projected above the screen and displace the air, creating a pressure difference. This is called acoustic radiation pressure. By focussing ultrasound waves at a specific point in mid-air, a noticeable pressure difference is created. Then the device creates a focal point by triggering the ultrasound tranducers with specific phase delays so that all sound waves arrive at the point concurrently.
