Capitalizing on the ability of human bones to conduct sound underwater, France Telecom R&D, in partnership with the French communications company Amphicom, has invented what it claims is a "world first." Comprising a buoy fitted with a GSM phone relay, and an underwater terminal, the company's system allows telephone communication with an undersea diver. The terminal, hard wired to the buoy, is equipped with a telephone-like dial pad and special mouthpiece. A buzzer and flashing light alert the diver to incoming calls. Sound waves from the surface transit through the system to the mouthpiece. When the diver bites down on the mouthpiece, the vibrations propagate to the ear via the skull, which acts as a resonance chamber. Conversely, the diver can talk back in half duplex mode. Presently under test by archeologists excavating the presumed site of ancient Egypt's Alexandria lighthouse, the underwater communication system is scheduled for commercialization by the end of this year. France Telecom, meanwhile, is looking at ways to eliminate the wire link between buoy and submerged terminal. Call Manuel Lesaicherre at +33 1 44 44 93 93 or e-mail manuel. email@example.com.
A bold, gold, open-air coupe may not be the ticket to automotive nirvana for every consumer, but Lexus’ LF-C2 concept car certainly turned heads at the recent Los Angeles Auto Show. What’s more, it may provide a glimpse of the luxury automaker’s future.
The complexity of diesel engines means optimizing their performance requires a large amount of experimentation. Computational fluid dynamics (CFD) is a very useful and intuitive tool in this, and cold flow analysis using CFD is an ideal approach to study the flow characteristics without going into the details of chemical reactions occurring during the combustion.
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