Sentences with phrase «sonar signals»

Killer whales, for instance, are known to swim away from areas where they have encountered sonar signals of about 142 decibels, a sound level lower than currently allowed by the U.S. Navy for its ships, Tyack said, referring to a 2014 study in The Journal of the Acoustical Society of America that determined the mammals» likely response.

That's because there are insufficient data to determine how the ill effects of noise created by ships, sonar signals, and other activities interact with other threats, including pollution, climate change, and the loss of prey due to fishing.

«These are the first direct measurements of individual responses for any baleen whale species to these kinds of mid-frequency sonar signals,» said Brandon Southall, SOCAL - BRS chief scientist from SEA, Inc., and an adjunct researcher at both Duke and the University of California Santa Cruz.

Why do the executives think it's a good idea to send out a sonar signal that attracts all the giant animals to a major city?

It's the most directional sonar signal measured in a living species, the researchers report November 9 in PLOS ONE.

The ship is equipped with a SeaBeam system, which bounces a sonar signal off the ocean floor while tracing a back - and - forth swath over the area like a lawnmower.

Some 15 minutes later, they came back with disheartening news: the sonar signal was a collection of plastic water bottles that must have been dumped overboard from a modern boat.

Director Brad Peyton competently stages most of the action, from George breaking out of his sanctuary, to a canister retrieval in Wyoming, led by scarred mercenary Burke (a briefly used Joe Manganiello), that turns awry, to the film culminating in mass destruction of Chicago as the three animals, well, rampage to get to the sonar signal at the top of the Wydens» skyscraper headquarters and Davis safely crashes a helicopter.

Observation and analysis of sonar signal generation in the bottlenose dolphin (Tursiops trucatus): evidence for two sonar sources.

Not exact matches

A fascinating new technology developed by a group at MIT uses Wi - Fi signals like sonar to detect human shapes.

Toss the Deeper Smart Sonar PRO + into the water, and it broadcasts its own Wi - Fi signal (which is more dependable than a Bluetooth connection) to connect to your smartphone or tablet and transmit detailed data from up to 330 feet away.

When these bacteria are placed inside an animal, an ultrasound detector can pick up those signals and reveal the microbes» location, much like sonar waves bouncing off ships at sea, explains study coauthor Mikhail Shapiro, a chemical engineer at Caltech.

He also believes that it underscores calls from marine biologists to explore how sonar produced by military and commercial ships could garble low - frequency signals sent by sea mammals.

«Scientists design bacteria to reflect «sonar» signals for ultrasound imaging: New technology may one day allow doctors to image therapeutic bacterial cells in patients.»

However, only sonar or visual evidence from a robotic submarine can confirm that the signals are from the missing Boeing 777.

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One can argue that such low - strength signals differ dramatically from the very harmful sonar that has been shown to significantly - and morbidly - affect large marine mammals like whales and seals.

Since cetaceans use sonar for navigation, it may have scrambled their own signals, effectively leaving them in the dark, leading to mass strandings.

A fascinating new technology developed by a group at MIT uses Wi - Fi signals like sonar to detect human shapes.