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Plinz's profile
Joscha Bach
Joscha Bach
Joscha Bach
@Plinz

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Joscha Bach

@Plinz

FOLLOWS YOU. Artificial Intelligence, Cognitive Architectures, Computation. The goal is integrity, not conformity.

San Francisco, CA
bach.ai
Joined April 2009

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    1. George Musser‏Verified account @gmusser Mar 29
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      Replying to @Plinz @DrPascalMeier

      In this simple Stokes law calculation, the distance scales with 1/R², so larger droplets go farther (more inertia). So a lot depends on the size spectrum.

      2 replies 0 retweets 2 likes
    2. Joscha Bach‏ @Plinz Mar 29
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      Replying to @gmusser @DrPascalMeier

      Of course if you are hit by larger gobs you are also more prone to notice. When small droplets evaporate before they hit the floor, the virus may stay in the air and waft around for a while.

      1 reply 0 retweets 1 like
    3. Bob Kerns‏ @BobKerns Mar 29
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      Replying to @Plinz @gmusser @DrPascalMeier

      Also, Stokes's law assumes rigid spheres. Larger droplets may assume a more aerodynamic shape. Smaller ones may be carried further on air currents. I'd want to know more about both before relying heavily on the simple calculation if my life is on the line! (It may be—so I do!)

      2 replies 0 retweets 0 likes
    4. George Musser‏Verified account @gmusser Mar 30
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      Replying to @BobKerns @Plinz @DrPascalMeier

      Here’s a chart of the Stokes law calculation. Yes, Stokes law is an approximation and misses much. My main point, though, is that I think the 2m guideline is based on such a calculation, and it is very sensitive to assumptions about size and initial speed.pic.twitter.com/xCmTcebzJK

      3 replies 0 retweets 1 like
    5. Bob Kerns‏ @BobKerns Mar 30
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      Replying to @gmusser @Plinz @DrPascalMeier

      I would expect it to be based on measurements, together with some assumptions about dose-response. Here's a 1946 paper...https://www.evernote.com/l/AA-nLB2pBwdNuqPL5_146bOu3ofO8xbLP4U …

      1 reply 0 retweets 1 like
    6. Bob Kerns‏ @BobKerns Mar 30
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      Replying to @BobKerns @gmusser and

      As to dose-response, I think data is limited. Here's a study on that wrt influenza, but I expect it's disease-specific and dependent on the route of entry.https://www.sciencedirect.com/science/article/pii/S1755436510000605 …

      1 reply 0 retweets 0 likes
    7. Bob Kerns‏ @BobKerns Mar 30
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      Replying to @BobKerns @gmusser and

      Of course, the existence of studies doesn't demonstrate they were actually used in creating policy guidelines. But I think if you go to the trouble of finding the particle size distribution, you'd find studies covering the distances they travel.

      1 reply 0 retweets 0 likes
    8. Bob Kerns‏ @BobKerns Mar 30
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      Replying to @BobKerns @gmusser and

      It's reassuring (and interesting) that Stokes gives similar results. It just seems to me a superficial approach to something that needs more real-world data. But I hate scalars. I want an infection PDF across multiple dimensions! 😎

      1 reply 0 retweets 0 likes
    9. Bob Kerns‏ @BobKerns Mar 30
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      Replying to @BobKerns @gmusser and

      And right on cue, today's LA Times on apparent aerosol transmission in WA.https://www.latimes.com/world-nation/story/2020-03-29/coronavirus-choir-outbreak …

      1 reply 1 retweet 0 likes
    10. George Musser‏Verified account @gmusser Mar 30
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      Replying to @BobKerns @Plinz @DrPascalMeier

      How awful. What sets the time that aerosols are suspended? It’s not gravitational settling, I presume.

      2 replies 1 retweet 1 like
      Joscha Bach‏ @Plinz Mar 30
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      Replying to @gmusser @BobKerns @DrPascalMeier

      Yes, this is really worrying to me, and might explain why it was so hard to get the infection rate down in Wuhan. And why China blew disinfectants into their streets. You may have to wait until the air is sufficiently diluted, or until the virus becomes inactive?

      6:03 PM - 30 Mar 2020
      • 2 Retweets
      • 2 Likes
      • vakibs Hitesh Kaushal Mary L. Risk
      0 replies 2 retweets 2 likes

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