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NYarvin's profile
Norman Yarvin
Norman Yarvin
Norman Yarvin
@NYarvin

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Norman Yarvin

@NYarvin

yarchive.net/blog
Joined April 2013

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    1. Jude Gomila‏Verified account @judegomila Mar 7
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      0/n: Science and engineering twitter: far UVC 222nm lighting has potential for rapid, retrofittable, cheap, effective, human safe, multi situation deployment to stop spread of COVID-19. However, there are questions I have in order to figure out its applicability. Here goes...

      16 replies 47 retweets 256 likes
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    2. Emily / aiju‏ @the_aiju Mar 7
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      Replying to @judegomila

      I highly recommend this paper: https://onlinelibrary.wiley.com/doi/full/10.1111/php.12093 … One interesting point is that UV germicidal lamps were commonly used 1940-60 but the occasional eye injury made them fell out of favour compared to disinfectants.

      3 replies 3 retweets 8 likes
    3. Jude Gomila‏Verified account @judegomila Mar 7
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      Replying to @the_aiju

      254nm dangerous for eyes. 222nm reflects off eyes.

      1 reply 0 retweets 7 likes
    4. Emily / aiju‏ @the_aiju Mar 7
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      Replying to @judegomila

      Yeah, I saw from @RajBhakta’s link. I’m a bit surprised there is such a huge difference between the two wavelengths.

      1 reply 0 retweets 2 likes
    5. Jude Gomila‏Verified account @judegomila Mar 7
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      Replying to @the_aiju @RajBhakta

      due to reflection mechanics? yes, layers of cell material might be resonating to reflect that specific freq. I have been thinking of the evolutionary reasons for this or whether just an offshot of the cell arch. would love more papers on those mechanics

      1 reply 0 retweets 4 likes
    6. Jude Gomila‏Verified account @judegomila Mar 7
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      Replying to @judegomila @the_aiju @RajBhakta

      just like microwaves and food heating. unexpected! just like the secret notes on a guitar...

      2 replies 0 retweets 0 likes
    7. Emily / aiju‏ @the_aiju Mar 7
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      Replying to @judegomila @RajBhakta

      One paper claims an absorption depth issue, rather than reflectivity, to be the cause. https://onlinelibrary.wiley.com/doi/10.1111/phpp.12156 … Seems to contradict the safety on skin (not sure what to make of it)

      1 reply 0 retweets 3 likes
    8. Jude Gomila‏Verified account @judegomila Mar 7
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      Replying to @the_aiju @RajBhakta

      I suspect its both, where does it contradict? I seem to recall that paper just being counter intuitive.

      1 reply 0 retweets 1 like
    9. Emily / aiju‏ @the_aiju Mar 7
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      Replying to @judegomila @RajBhakta

      Well, it says volunteers had skin reddening and increased CPD levels (which increase skin cancer risk).

      1 reply 0 retweets 0 likes
      Norman Yarvin‏ @NYarvin Mar 7
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      Replying to @the_aiju @judegomila @RajBhakta

      The difference may be that the study claiming that it was safe included filtering to let through only 222 nm light. The raw excimer lamp produces other wavelengths too.

      6:16 PM - 7 Mar 2020
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      • Emily / aiju
      1 reply 0 retweets 1 like
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        2. Jude Gomila‏Verified account @judegomila Mar 7
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          Replying to @NYarvin @the_aiju @RajBhakta

          I think there is also def a max dosage and flux that is going to be dangerous to humans, what flux and dosage did they run it at? Ie if you put all the power of a nuke through this wavelength you will destroy most things...

          2 replies 0 retweets 0 likes
        3. Norman Yarvin‏ @NYarvin Mar 7
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          Replying to @judegomila @the_aiju @RajBhakta

          This is the 222 nm study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5552051/ … The mice got a total of "157 mJ/cm^2 in a 7 h period". But they also give numbers for "power density" in mJ/cm^2, which is a bad sign. (Power is measured in watts, not joules.)

          2 replies 0 retweets 1 like
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