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Reliance Communications has made full repayment of two loans amounting to $1 billion (around Rs 6,000 crore), during the quarter ended June 30.The repayments have been from the company's rupee resources.

Sci - Tech
 

New device fires low-frequency sound waves to scare birds away from planes

Tuesday - Jan 22, 2013, 01:10am (GMT+5.5)
[+] Text [-]

London - A new device is using infrasound, below the range of human hearing, to scare birds away from airports.

The trial version of the Avian Infrasound Non-lethal Denial System, developed by Technology International, based in Laplace, Louisiana, has a passive infrasound detector that listens for an approaching flock, and activates a series of rotary subwoofers that generate high-intensity, but low-frequency sound. It worked well in tests, the New Scientist reported.

Abdo Husseiny, the firm’s CEO, explained that thunderstorms also emit lots of infrasound, which may be why birds are naturally averse to it.

Husseiny added that the system could also be used to keep pigeons away from public squares, or divert flocks away from wind turbines.

The device should be commercially available within two years, he said.





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