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  1. chemisttree

    Wuhan Coronavirus Containment Efforts

    I wouldn’t trust early data in recently infected areas. It takes a significant event, like unusual death rates, to diagnose a new respiratory death at the height of flu season. Over time the CFR will likely be in line with the ~2% rate of diagnosed cases unless mass testing is done like what...
  2. chemisttree

    Are microwave susceptors attenuated in viscoelastic mediums?

    Impedance is more than just the dielectric constant as I understand it. Impedance is frequency dependent, for example. Perhaps frequency dependent dielectric permittivity is the term you intend?
  3. chemisttree

    Are microwave susceptors attenuated in viscoelastic mediums?

    Probably reflective losses are significant. See here for example. I believe you need to impedance match the composite (to air) to get full absorption otherwise the RF reflects.
  4. chemisttree

    Preserving breast milk for jewelry

    Now it is polyvinyl alcohol made from hydrolyzing polyvinylacetate. It is referred to as a PVA glue.
  5. chemisttree

    Wuhan Coronavirus Containment Efforts

    Although that’s true in COVID-19, it isn’t always the case. Swine flu 2009 had this mortality distribution: https://www.cdc.gov/H1N1FLU/images/graphs/qa_graphC.gif
  6. chemisttree

    Are there microfibers of a different type?

    Microfiber has a definition that is not quite as binary as you might think. https://en.m.wikipedia.org/wiki/Microfiber
  7. chemisttree

    Wuhan Coronavirus Containment Efforts

    That is the best news I’ve heard since the beginning of this thing. If things get dire and you need something that I might be able to ship, PM me.
  8. chemisttree

    Wuhan Coronavirus Containment Efforts

    Yes, I believe one of the deaths was a cancer patient. I’ve seen firsthand what treatment does to the immune system. I said,” # of critical cases ratio to total cases approaching 40%! Something is not right there. CFR is ~5%. Not right at all.”
  9. chemisttree

    Wuhan Coronavirus Containment Efforts

    It could be due to the superspreader’s contacts at church.
  10. chemisttree

    Wuhan Coronavirus Containment Efforts

    I think that’s what we’re seeing in China now where positive cases are being warehoused in military barracks and convention centers. Even those emergency hospitals look suspiciously like containment facilities rather than hospitals. https://www.taiwannews.com.tw/en/news/3870468...
  11. chemisttree

    Wuhan Coronavirus Containment Efforts

    During the 2009 swine flu outbreak, several countries (Australia, Great Britain and the US) promised to fulfill export orders and donations (US promised to export 10%) only to withdraw those offers until their own domestic needs were met. In the US there were manufacturing problems that...
  12. chemisttree

    Wuhan Coronavirus Containment Efforts

    Good luck! I have seen pictures of the shops in Milan with empty shelves. I’ve lived through that every time a hurricane threatens landfall close to San Antonio, Texas. What have you seen that you call “people going nuts” and “general hysteria?” Are you able to still go to work with the...
  13. chemisttree

    Wuhan Coronavirus Containment Efforts

    Springer Nature has made all of its COVID-19 reports available for free. https://www.springernature.com/gp/researchers/campaigns/coronavirus I don’t know how to value this.
  14. chemisttree

    Wuhan Coronavirus Containment Efforts

    I don’t think it’s overreaction. What I believe is going on is that during the height of flu season, we have a rapidly spreading, largely unknown thing. If the caseload stays manageable, if the population demographics are favorable and the CFR is about the same as the flu, if the R0 can be...
  15. chemisttree

    Wuhan Coronavirus Containment Efforts

    Ask the Chinese, the Italians, the Japanese, the South Koreans, Singapore. They are certainly a bit “worked up.” The flu can’t be stopped and no one even tries. We have a vaccine that sometimes works and even if it doesn’t completely work, it usually gives partial protection. You get sick...
  16. chemisttree

    Wuhan Coronavirus Containment Efforts

    I think it’s time to admit that containment has failed. The infuriating thing is that in practically the same breath as the PHEIC declaration, WHO recommended against travel restrictions from China. If you want to point to the instant that quarantine failed, it was back on Jan. 30th. “In...
  17. chemisttree

    Wuhan Coronavirus Containment Efforts

    Yes, I’m reading that now but not before. “Dr. Bonnie Henry said the woman in her 30s visited the Middle East country in January and returned to B.C. that same month. She was diagnosed after taking herself to hospital with flu-like symptoms, she added, but was sent home.”
  18. chemisttree

    First TED talk by a PF staff member

    Great job! Congratulations as well. Greg, shouldn’t there be a badge for something like this?
  19. chemisttree

    Cooking fumes and bio effects

    I think any process that produces acrylamide, like frying, will produce volatiles containing it. It should be done in a fume hood!
  20. chemisttree

    Wuhan Coronavirus Containment Efforts

    The CDC really needs to update this flowchart to be used by healthcare professionals for identifying potential COVID-19 cases. The bolded part should be “...tests negative for flu...” “For the evaluation of patients who may be ill with or who may have been exposed to 2019 Novel Coronavirus...
  21. chemisttree

    Wuhan Coronavirus Containment Efforts

    Italy’s numbers are startling. 18 new cases bringing their total to 39 with 2 deaths and 16 critical cases. # of critical cases ratio to total cases approaching 40%! Something is not right there. CFR is ~5%. Not right at all.
  22. chemisttree

    Wuhan Coronavirus Containment Efforts

    It has jumped from Iran into Lebanon and British Columbia via recent travel from Iran. What are the odds that two travelers had contact with these 18 cases? Iran probably has a much bigger problem than these numbers suggest. The BC case travelled to Iran and returned home back in January...
  23. chemisttree

    Wuhan Coronavirus Containment Efforts

    Thanks for the link. The story links back to the clinical trial index. Searching “chloroquine” in the scientific title field yields 15 trials underway. Should have answers by May.
  24. chemisttree

    Temperature variations in body regions

    There would be some pretty grim faces in that line, I imagine.
  25. chemisttree

    How can I measure the terrestrial tide on my place?

    I would have thought you could measure something like that with a gps signal?
  26. chemisttree

    Giving a jump start to a car - how does the circuit become complete?

    I always thought it was Brown’s gas being produced by the battery. There is a dead space above the acid level, about 1/2”, errr, 12.5mm high inside the case where the gas collects. It doesn’t float anywhere. As it is produced it exits via a vent nowadays. In the old days it exited through...
  27. chemisttree

    Giving a jump start to a car - how does the circuit become complete?

    It happened to me once. 70-something Chevy truck. I was working at Firestone as a GS at the time when a fella comes in and asks for a jump across the street at the K-Mart gas station. I go over and connect the cables just as I was taught, last connection being to his truck on the engine...
  28. chemisttree

    Wuhan Coronavirus Containment Efforts

    I think we’ll know more from the cruise ship passenger data if they release it.
  29. chemisttree

    Wuhan Coronavirus Containment Efforts

    My point only was that you have to exclude a massive set of data (Hubei) to make sense of it. What part of the data are you modeling that gives you the 10K cases before the first fatality? Does it include or exclude Hubei? I think the R0 is very fluid. When the virus is imported in large...
  30. chemisttree

    Wuhan Coronavirus Containment Efforts

    Tough to model China’s GIGO, eh?
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