338 results found displaying 49-51
    
gracken
 Ecuador
Protect Copyrighted CDs/DVDs Printer Friendly Version
CDs and DVDs that have a small re-writable part to write serial numbers for each customer, you could even make that a critical component of the program that would be encrypted. You could decrypt the CD/DVD with the serial number. This could also be incorporated to prevent unauthorized copying, which can be done with that current discs with many different programs.
Reward: one please 

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20°

    
nagu000in
 India
Detection of interrupted railway line Printer Friendly Version
The sound that is produced due to a train on a rail track is converted into electrical signals and any interruption in the track can be known far away by the variations in the signals.
Reward: for a happy journey 

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60°

    
acefreak
 USA
Jet Engine Energy Recycle Printer Friendly Version
The basic idea is to harness the energy created from the thrust of a commercial jet engine. You would place another turbine behind the main turbine that is propelling the jet forward, except this turbine will not be pushing it forward, instead it will be harnessing the energy created from the thrust of the main engine. As the main turbine is powered by the engine and is running, it creates a powerful stream of air that will turn the second turbine and still let the air flow through. It may lose a minuscule amount of thrust, so it will not make much of a difference in regards to power. Thus, as the second turbine turns, it will create energy that could be fed back into the plane to power anything, like possibly the electronics in the plane(A/C, lights, t.v., etc.).
Reward: Free travel on whatever airline uses this idea. 

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60°

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