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Hear how engineers and technologists are creating for good out in the world.

 

AOPA's Air Safety Institute released its 24th annual Joseph T. Nall Report (PDF) this week, including for the first time a review of helicopter accident causes. Overall, accident rates for non-commercial fixed-wing aircraft climbed from 6.30 per 100,000 hours in 2010 to 6.54 in 2012 due to flight time decreasing while accident counts remained level in that period.

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As the series has grown and attracted lucrative television contracts and global sponsors, it has allowed teams with bigger budgets to use superior technology to eliminate human error.

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Offshore wind energy could add 4.2 million megawatts to the generating capacity of the U.S., according to the National Renewable Energy Laboratory, but the U.S. market has stalled almost completely, hindered by regulatory uncertainties, political opposition, litigation and a lack of available financing.

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An engineering professor has developed a new highly efficient and low cost light emitting diode that could help spur more widespread adoption of the technology.

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Researchers have wired four perovskite solar cells in series to enhance the voltage and directly photo-charged lithium batteries with 7.8% efficiency.

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About a quarter of all drinking water is lost on its way to consumers. A new type of online platform equipped with networked measuring devices, sensors, and pumps, promises to provide the information needed to improve efficiency.

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Clinical Chemistry: Chip-based devices could help save donor lungs and patient lives

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Debate around spectrum sharing for next generation communications systems continues, following a recommendation by the industry group Wi-Fi Alliance to withhold certification of LTE-Unlicensed equipment. Licensed and unlicensed spectrum management is a critical concern ahead of an expected boom in data needs and connected devices by 2020.

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if a person sells two items one at 10% loss and other at 10% gain what is his loss or gain percentage? please give the explanation..

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