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63 results found displaying 49-51
      
Jesse Bang
 USA
Active sonar cancellation Printer Friendly Version
Perhaps if we can outfit submarine hulls with two layers instead of one, we might be able to cancel out the reflected waves. I have already measured out how thick the gap between the hulls should be: x(lambda)/4; where x is any odd integer. In this way, we will recieve reflection where the waves have the least energy, which is at the equilibrium.
The first layer should be any kind of material able to transmit 66% of wave energy and reflect 33%. 66% of the wave energy is transferred into the gap between the hulls, where it is then reflected yet again through the first layer. This accounts for 66% of 66% of the initial wave energy. since it most nearly matches that of the originally reflected 33%, and since the spacing is correct so that dephasing might occur, most of the waves will be cancelled, creating a much, much weaker sonar signal. It might be small enough to even avoid detection by sonar systems aboard submarines. If no such material is available, perhaps ordinary steel with holes would work.
Of course there is the significant problem of not knowing the wavelengths of the many thousands of sonar devices on submarines throughout the world.
Reward: the navy's recognition of a feasible technology 

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61°

      
Tristan Strever
 South Africa
Magnetic transport Printer Friendly Version
Like magnetic poles repel each other, right?. What if we were to have pavements or "magnetic ways" that were the same magnetic pole as a magnetic skateboard. People will be able to hover and move by leaning forward and stop by leaning backwards.
No fuel or energy is consumed either. Surely we could use this concept for motor vehicles on highways?
Reward: I would like to be involved in the R&D if someone were to do this. 

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49°

      
Derek
 Canada
Fast Transport of Packages Printer Friendly Version
If anyone has ever played the PC game Grim Fandango, there is a machine which sends messages through the DOD building. I think we could expand that idea to have a virtual network of package delivery systems. You would simply put the package into the containter, close the lid and enter where you want the package to go. This would release the package into a very large tube which would push the package to its destination via vacuum. There would be sensors that detect where the package is going, so that when it gets very close (and there is no package between it and the destination, a cushion is released, stopping the package, which is then lifted using a rising platform to where the person at the other destination can get it. The cushion would then be detracted to let other packages flow. The package would be tracked using the FedEx like system (perhaps using GPS technology?) which tracks its packages. The first system would connect major centres, which then would have subsystems to join the major cities in those general areas. Finally a third subsystem might be used to connect the smaller cites in the area, although at this point the current system (e.g. UPS coming to your door using their brown vans) would suffice. So the package would simply go around the globe to major centres, and then put into a different system of package tubes which serves the local area, and so on until it reaches its destination.
Realistically, this is a very long term idea, but in the nearer future it would make sense to connect the hubs that all the package companies fly to with these tubes.
Reward: Less pollution in the air from jets flying packages is ... priceless. 

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50°

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