Donald Mitchell

@DonaldM38768041

Research Scientist, Author. (Caltech, Bell Labs, Princeton University, Microsoft Research)

Vrijeme pridruživanja: kolovoz 2019.

Medijski sadržaj

  1. 2. velj

    This was OSI, and it had at least one elegant theoretical idea, which was the protocol stack -- a logical layers of how you go from copper wires to network applications.

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  2. 2. velj

    Came across some of my old CCITT/OSI books. I think the theory of the OSI stack is still taught in the classroom, but I suspect a lot of the lore will be forgotten.

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  3. 30. sij
    Odgovor korisniku/ci

    Wheeler's other book is also quite nice.

  4. 29. sij

    To make things more complex, this roiling plasma conducts electricity, generating and absorbing magnetic fields.

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  5. 19. sij

    In 1947, Convair and Aerojet believed that H3 would be an excellent rocket fuel for the MX-774 ICBM, superior to ordinary liquid H2. They attempted to reproduce a published method for synthesizing it, but the experiment failed.

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  6. 19. sij

    Helge Kragh has written an excellent history of this controversial molecule, including early theoretical predictions of its structure.

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  7. 18. sij

    Working on some deep problems.

  8. 15. sij

    I like the limited muted color palette of the ceder trees behind my house, dusted with snow.

  9. 15. sij

    Glycerin and dry potassium permanganate ignite when mixed. But if they are dissolved in water, after a few minutes the solution instantly solidifies. (I edited out the minutes of me pouring the liquid back and forth)

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  10. 14. sij

    I always look forward to his videos reviewing advanced computer-graphics papers.

  11. 13. sij

    It snowed last night

  12. 11. sij

    A two-foot pipe with thick copper walls has very little electrical resistance, which makes it a perfect demonstrator for Lenz's law. Dropping a spherical neodymium magnet, induced electric currents generate an opposing magnetic force that slows its fall.

  13. 11. sij

    This is a fun chemistry channel on YouTube. His video about silver is particularly pretty:

  14. 11. sij

    Talking about burning magnesium, I decided to light a small ribbon of it. Random factoid: magnesium is the most common metal in the universe.

  15. 11. sij

    One other detail, this is a photo of a spark chamber. You can see just to the right of me, a row of sparks from a cosmic ray going thru the charged plates and causing a discharge by ionizing the air.

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  16. 11. sij

    This was a CDC 6638 file system, also called an 808 disk drive. We also had one at the University of Minnesota. 72 platters, 26 inches in diameter, stored about 150 Mb. It had very fast transfer speeds for the time.

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  17. 11. sij

    The main control room and one of the monitors seen all around the site.

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  18. 11. sij

    The first two stages of the accelerator, a Cockroft-Walton generator (something like a million volts) inside a Faraday cage. Next a linear accelerator fed a small booster ring, which in turn fed the main ring.

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  19. 11. sij

    The Neutrino Lab, and a cooling pond.

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  20. 11. sij

    Fermilab used about $500,000 of electricity a year, in 1977 dollars. I thought I had a photo of the giant capacitor bank used to provide surges of power, but I found one online.

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