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APHORISMS OF FAMOUS PEOPLE
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Aphorisms of famous people. Titus Lucretius Kar

Aphorisms of famous people

Free library / Aphorisms of famous people

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Titus Lucretius Kar. The most famous aphorisms

  • All life is a long struggle in the dark.
  • If the feelings are not true, then our whole mind will be false.
  • A drop wears away a stone.
  • Some wear out their lives for statues and glory.
  • There is nothing beyond the imagination of man.
  • Nothing can be created from nothing.

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See also Sections Winged words, phraseological units и Proverbs and sayings of the peoples of the world.

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A transistor that can be dissolved by sound and water 04.05.2021

Most of the old electronics end up in landfill, not for recycling. Partly because it's hard to separate and retrieve the valuable materials that make it up. To solve this problem, engineers from the American Duke University have developed the world's first fully recyclable printed electronics, which are decomposed into their constituent parts using a bath of water and sound waves.

Printed electronics are made using conductive inks to create thin and flexible electronic circuits. Recently, nanocellulose has been used as an experimental material. Nanocellulose is a biodegradable material that has been used in packaging for years. And although people have long known about the possibilities of its use as an insulator in electronics, no one has thought of using it in printing ink."

Experts have found a way to combine nanocellulose with ink by reducing it to a crystalline form and adding a little salt. These dielectric inks are then mixed with conductive ones made from graphene and semi-conductive ones made from carbon nanotubes. The result is carbon transistors that can be spray-printed onto a paper substrate at room temperature.

Tests have shown the capabilities of the transistor on the example of a paper sensor of lactic acid salts. It demonstrated rather high efficiency and remained stable for more than half a year.

The process of recycling a transistor begins with immersing the device in turn in baths of water and gentle exposure to sound waves. After processing the resulting solution in a centrifuge, almost 100% of graphene and carbon nanotubes are separated, which can then be used again in the printing process. And nanocellulose is sent for processing along with the paper backing.

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