Manual Modern Vacuum Physics

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Class 76 - वायु तत्व (Vacuum Energy) - Part 1

From the 3D simulations carried out at the Osaka University Institute of Laser Engineering, they also found that the density during the maximum compression of the bubble reaches several hundred thousand to one million times solid density. At this density, something no larger than a lump sugar would weigh a few hundred kilograms. The energy density at the bubble center was found to be about one million times higher than that at the sun.

These astonishing numbers have been thought to be impossible to achieve on Earth. Their research results were published in Physics of Plasmas.

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    Shipped from UK. Established seller since Electrons are emitted from the source thanks to a voltage applied across it and the drain, while the gate controls the electron flow across the cavity. In their paper published online today in Applied Physics Letters , Meyyappan and colleagues estimate that their nano vacuum tube operates at frequencies up to 0.

    The team's device isn't the first attempt at miniaturizing the vacuum tube.

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    Contrary to previous work, however, the researchers do not need to create a "proper" vacuum: The separation of the source and drain is so small that the electrons stand very little chance of colliding with atoms in the air. This is a huge benefit, says Meyyappan, because it opens the door to mass production.

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    • Still, she cautions, the nano vacuum tube is more of a "proof of concept" than a working device, since its operational requirements do not yet match modern transistors. As one example, about 10 volts is needed to switch the device on, whereas modern transistors operate at about 1 volt; in this respect, the nano vacuum tube isn't compatible with modern circuits.

      (PDF) Modern Vacuum Physics | Carlos David Ramos Vilchis -

      Even so, the potential is great, says Meyyappan. The new vacuum tube's inherent immunity to radiation could save the military and NASA a lot of time and money, while its faster operation makes it a rare candidate for so-called terahertz technology. Sitting between the microwave and infrared regions of the electromagnetic spectrum, the terahertz region can pick out the "fingerprints" of certain molecules.

      The technology could therefore be used at airports to safely scan for illicit drugs, for instance. So are vacuum tubes poised to make a comeback?

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      Meyyappan thinks so. By Jeffrey Mervis Sep. By Jocelyn Kaiser Sep. By Meredith Wadman Sep.