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Scientists convert sound into light
Livermore, Calif. (UPI) Mar 16, 2009 U.S. scientists say they have, for the first time, changed high frequency sounds into light by reversing a process that converts electrical signals to sound. The Lawrence Livermore National Laboratory researchers said their new tool enhances the way computer chips, LEDs and transistors are build. Commonly used piezo-electric speakers, such as those found in a cell phone, operate at low frequencies that human ears can hear, the scientists from LLNL and the Nitronex Corp. said. But by reversing that process, lead researchers Michael Armstrong, Evan Reed and Mike Howard used a very high frequency sound wave -- about 100 million times higher frequency than what humans can hear -- to generate light. "This process allows us to very accurately 'see' the highest frequency sound waves by translating them into light," Armstrong said. The complex research appears in the journal Nature Physics. Related Links Stellar Chemistry, The Universe And All Within It
Analysis: Oil and Gas Pipeline Watch
Washington DC (UPI) Apr 29, 2009Iran is not excluded entirely from emerging as a possible natural gas supplier to the Western-backed Nabucco pipeline, U.S. representatives said. Turkey has a key role to play as an important energy hub in the European drive to diversify regional natural resource transit options, Czech officials said. The Calgary-based TransCanada Corp. began its permit process for an Alaska gas pipeline by submitting plans to a U.S. energy commission for review. |
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