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    Vertical wind turbine with two concentric rotors

    Hello. For a long time, I wanted to build a wind turbine prototype that would have two concentric rotors. The design was inspired by an automotive torque converter, used with automatic transmissions. This device would have an external rotor that would be coupled to one generator and an internal...
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    Synthetic fibers (rope) that absorb water and shorten

    Hello. I have an engineering idea, an invention. I want to make a watering valve for plants that opens the water when the soil moisture content is too low. I am looking for a material that (1) would not rot, and (2) absorb water and contract at a significant rate to open a valve (millimeter...
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    Two eccentric flywheels run on same axis

    I was asked to build an experimental setup for one of my friends and I did it successfully. The setup included two eccentric flywheels, spinning in opposite directions on the shafts of two stepper motors that were facing each other. I 3D printed a pair of identical eccentric flywheels and...
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    Intense light igniting a mixture of fuel and air

    Homework Statement We are working on a project for a class. I was given a part of the project where focused light is used to burn off carbohydrates. I want to know names of the following values so I can look them up and their relationships. Energy required to start combustion at atmospheric...
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    Where would I shop for safe to drink lab alcohol?

    Hello. I am performing some biochemical process where the end product is going to be intended for human consumption. I am curious where I can buy large quantities of ethanol that is safe for drinking. I don't want to use the liquor store corn alcohol because it has some impurities...
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    FLUXGATE magnetometer - how it works

    Assuming that I am looking at an 'ideal' fluxgate magnetometer. I am feeding this transformer an ideal sine wave. The secondary winding output and the primary winding input are fed into two channels of an oscilloscope. A magnetic field from the outside (like earth magnetic field) is...
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    Lear physics with mathematics.

    Hello I would like to know if there are any good textbooks that can teach mathematics in relationship to physics or explain the usage of popular physical formulæ. I am a hobbyist and I need to have a better understanding of the Calculus problems that I am dealing with while I am working on...
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    Entropy and electromagnetic radiation

    I don't understand this: According to what modern physicists believe to be true, there is entropy that slowly converts all energy of the universe into heat that cannot do any work. Than this heat is radiated as infrared light into space. Correct? Besides infrared heat radiation, start also...
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