Environmental News

Discussion in 'Environmental Discussion' started by tochatihu, Oct 22, 2015.

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  1. tochatihu

    tochatihu Senior Member

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    Chicxulub 65 million years ago at least contributed to extinction event, maybe some big volcanics at same time, or maybe it was primary cause.

    There have been other more recent impacts, causing large craters, that have not upended biology. It's all very confusing. Chicxulub is 180 km diameter. See also Popigai Siberia (100 km, 35.7 Mya) and Chesapeake Bay US (85 km, 35.5 Mya). More controversially, Ancylus Lake Sweden that may be a 1600 km diameter crater (!) formed 6500 years ago. I've no idea how folks could have slept through that one. Plus tsunami and megafires and all the rest of it. Again, there is major disagreement over whether it is an impact structure.

    Point is that Chicxulub impactor was not unique (although it's hit point seems to have uniquely bad aspects). It is for asteroid hunters (robotic telescopes) to announce the next event hopefully long enough in advance to make a trajectory change.

    It would be the greatest clickbait headline ever. Unless "ET - for sure this time" takes top spot.

    As we await our fate :eek: read about this:

    Nördlinger Ries - Wikipedia
     
    #821 tochatihu, Mar 31, 2019
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  2. tochatihu

    tochatihu Senior Member

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    #822 tochatihu, Mar 31, 2019
  3. bisco

    bisco cookie crumbler

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    that's good, cause things were pretty average on the least coast this winter.
     
    #823 bisco, Apr 1, 2019
  4. Raytheeagle

    Raytheeagle Senior Member

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    Record snowfalls in the Sierras on te best coast;).

    60 feet of snow in 60 days in some locations, which is on par with what the Donner Party experienced:eek:.

    Let’s hope for different results (y).
     
    #824 Raytheeagle, Apr 1, 2019
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  5. tochatihu

    tochatihu Senior Member

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    Y'know what's weird? There are even craters on Venus. Even that heckuva thick atmosphere is not enough for serious incoming rocks.
     
    #825 tochatihu, Apr 2, 2019
  6. bisco

    bisco cookie crumbler

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    let's not build there
     
    #826 bisco, Apr 2, 2019
  7. Trollbait

    Trollbait It's a D&D thing

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    If we built there, most likely the buildings will be lighter than air craft sitting about halfway down in the atmosphere. With warning, they could move out of the way.
     
    #827 Trollbait, Apr 2, 2019
  8. bisco

    bisco cookie crumbler

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    thermophiles take over centralia, pa
     
    #828 bisco, Apr 2, 2019
  9. bisco

    bisco cookie crumbler

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    'shell to leave u.s. refining lobby over climate disagreement'
     
    #829 bisco, Apr 2, 2019
  10. hill

    hill High Fiber Member

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    Some of us actually get yelled out for turning lights off when others leave the room. Turn off the PC? Printer? Cable box at night? WW III. Nothing more ridiculous than hearing the hum of the central air running, only to find the slider door open - so the dogs can come & go with ease.
    .
     
    #830 hill, Apr 2, 2019
  11. bisco

    bisco cookie crumbler

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    there's that, too. :cool:
     
    #831 bisco, Apr 2, 2019
  12. fuzzy1

    fuzzy1 Senior Member

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    Indications here that:
    (1) the Ethiopian Airlines pilot did initially follow Boeing's recommended recovery procedure, but when that failed, gave up and turned the automatic trim system back on and made the situation worse;
    (2) forces on the stabilizer may become too great to manually turned the trim wheel;
    (3) pilot manuals for 737 and others craft long ago contained a more extensive procedure for overcoming this great force, but it has since been deleted from the manuals.

    Doomed 737 MAX’s pilots apparently followed Boeing’s emergency directions | The Seattle Times
     
    #832 fuzzy1, Apr 3, 2019
  13. bisco

    bisco cookie crumbler

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    i wouldn't call that pilot error. even the old roller coaster technique shouldn't be necessary in a properly designed plane, should it?

    'boeing states overhaul will take longer than expected'

    'faulty sensor linked to u.s. repair facility the day previous to lion air crash'

    'grand jury subpoena shows extent of criminal probe into max 737 certification'
     
    #833 bisco, Apr 3, 2019
    Last edited: Apr 3, 2019
  14. fuzzy1

    fuzzy1 Senior Member

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    I don't believe anyone is calling that particular scenario a pilot error. The deletion from the manual makes it more of a manufacturer documentation and training course error, at minimum.
     
    #834 fuzzy1, Apr 3, 2019
  15. tochatihu

    tochatihu Senior Member

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    As we're getting out ahead of official crash investigation here, another report claims that AoA sensor (left-side one connected to MCAS) was damaged in Ethiopian. Facts to follow later we hope.
     
    #835 tochatihu, Apr 3, 2019
  16. bisco

    bisco cookie crumbler

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    they are investigating possible repairs prior to crash
     
    #836 bisco, Apr 3, 2019
  17. bisco

    bisco cookie crumbler

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    i still don't think planes should be designed like this, but maybe i don't know enough about aerodynamics, and it's the best that can be done.
     
    #837 bisco, Apr 3, 2019
  18. bisco

    bisco cookie crumbler

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    i wonder if there was a big sign when boarding that said:

    'this plane tends to nose up, so we installed sensors and software to make it nose down in some instances.
    in case of too much nosing down, pilots can override the software and nose up. in most cases.'

    i wonder if any boarders would balk
     
    #838 bisco, Apr 3, 2019
  19. tochatihu

    tochatihu Senior Member

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    Going way back to my @596 here. It is now established that problematic nitrogen does come from the sewage-treatment plant:

    Coral study traces excess nitrogen to Maui wastewater treatment facility: Nutrient pollution has been blamed for algal blooms and degradation of coral reefs along Maui's west coast -- ScienceDaily

    When Supreme Court hears this case they will learn something about nitrogen biogeochemistry and stable isotopes. I think that's nifty even though their ruling cannot be predicted.
     
    #839 tochatihu, Apr 3, 2019
  20. tochatihu

    tochatihu Senior Member

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    "... it's the best that can be done." @837. I suggest that sentence becomes true after adding an additional phrase:

    "at a particular price point."
     
    #840 tochatihu, Apr 3, 2019
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