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MeirG
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re: Piezoelectric scheme seeks to reap the wind while driving
MeirG   2/10/2010 8:31:50 PM
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Of course you need to burn gas to produce electrical energy. And that's also how electricity produced by a rotating generator is "harvested". No one yet did anything to circumvent Newton's law. So the question is one of overall efficiency. Which one's is higher, a Piezoelectric device or a rotating generator's. Also which is smaller, less expensive to manufacture, more reliable and less expensive to maintain.

N2Hmm
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re: Piezoelectric scheme seeks to reap the wind while driving
N2Hmm   12/3/2009 3:00:12 AM
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Gulton and Piezo Electric products tried doing something like this 20+ years ago. The problem was the ceramic material would fracture over time with the flexing of the material. You need a polarized material that is not as rigid.

pfiekowsky
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re: Piezoelectric scheme seeks to reap the wind while driving
pfiekowsky   12/3/2009 12:19:41 AM
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According to the article, and previous work, the energy is more-than free. You actually burn less gasoline. How does it conserve energy? Reduced heating of the wake and the airfoil skin. It reduces turbulence by absorbing the vibration energy on the skin. 30 years ago they talked about similar energy absorbing skins that allowed some fish and some submarines to go faster than a hard skin would allow. Very cool.

chandan_e
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re: Piezoelectric scheme seeks to reap the wind while driving
chandan_e   12/2/2009 7:36:44 PM
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The energy from this scheme is not free. It ultimately comes from the gasoline that powers the vehicle. If it produces 200 watts, you have to burn that much more gasoline.

Les Slater
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re: Piezoelectric scheme seeks to reap the wind while driving
Les Slater   12/2/2009 4:47:31 PM
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Neat, producing electrical power while reducing drag, a double win. Environmental power harvesting has great future potential.

teix
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re: Piezoelectric scheme seeks to reap the wind while driving
teix   12/2/2009 3:30:01 PM
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When we get 200W per square meter this energy is not result from an increase of energy consumption of the vehicle in the same amount?



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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