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APHORISMS OF FAMOUS PEOPLE
Free library / Aphorisms of famous people / Thomas Dewar

Aphorisms of famous people. Thomas Dewar

Aphorisms of famous people

Free library / Aphorisms of famous people

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Thomas Dewar. The most famous aphorisms

  • Most people believe in heredity until their children make complete fools of themselves.
  • Walk forward, looking around.
  • Sometimes a step forward requires a step back.
  • How wonderful it is that most of our problems never happen.
  • Few wake up famous. Most often they dream about how they will become famous, and then wake up.
  • Never open your mouth until you are sure that your brain is working.
  • Experience is what you get when you look for something completely different.
  • You can't leave footprints in the sand of time sitting.
  • The further you are from the problem, the less it is.
  • The less a person needs to say, the more words he needs to do it.

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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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Changing the state of matter with a flash of light 29.10.2018

In physics there is such a concept - charge density waves. We are talking about the distribution of charge in conductors, as a rule - in metals. It is uneven: somewhere there are more electrons, somewhere there are more positively charged ions. The phenomenon is associated with the structure of the crystal lattice and, in general, is well studied.

However, "not bad" in physics never means "not at all". This is exactly what a team of scientists from the SLAC National Accelerator Laboratory of the Department of Energy and the Massachusetts Institute of Technology has demonstrated by finding a simple and very fast way to invert these waves. A flash of laser light is used as a "switch".

As a test material, the experimenters used tantalum disulfide. Its crystal was irradiated coherently at a wavelength of 800 nm. The pulse duration was 80 femtoseconds. The area of ​​the irradiated sample was 150 x 150 micrometers, with a thickness of 50 nanometers.

As it turned out, under these conditions, the charge of the observed regions after each flash changes to the opposite, and after the next - back.

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