[ARC5] AB5S Kung Flu Update, 13 June - source?
Richard Knoppow
1oldlens1 at ix.netcom.com
Sun Jun 14 18:55:47 EDT 2020
A special problem with the violin is bone conduction. The
instrument is held clamped under the jaw so a lot of its energy
is conducted right into the ear.
My deafness is probably genetic although I don't remember
much deafness in my family. No one really knows the source. I
suffer from distortion, can't distinguish words. Actually do
better with code. My high frequency response sitll goes out
pretty far but has deep holes in it. Not a middle ear problem,
have had that investigated. If the virus ever calms down I will
probably have cochlear implants. I am fed up with being deaf.
On 6/14/2020 3:25 PM, Michael Hanz wrote:
> There appears to be some correlation, Richard. I know that
> violinists and violists like myself have a higher incidence of
> left ear damage after a lifetime of playing. Some studies
> showed as much as 100dBA levels from the violin in the left
> ear, which explains my deterioration, though the response curve
> made my audiologist go nuts - it has several strange jagged
> peaks and valleys across the audio spectrum. My right ear is
> still fine to 14kHz. Go figure.
>
> The strange thing is that classical music doesn't have the
> ear-splitting steady intensity of rock - it has short SPL
> peaks, with valleys that are prolonged. The final bars of some
> great symphonies like Beethoven's 9th are at full bore triple
> forte,, but typically last less than a minute at that volume
> level. Anyway, today's violin students usually wear cotton or
> an ear plug in the left ear after they get to the point where
> they can play the instrument at a forte level.
>
> On 6/14/2020 4:45 PM, Richard Knoppow wrote:
>> I wonder if anyone has ever done a statistical study of the
>> disease rate among symphony musicians. Maybe its like hearing
>> tests among musicians and recording engineers, no one wants to
>> know. Many years ago I suggested doing a hearing survey at an
>> Audio Engineering Society convention, you would have thought I
>> had suggested eating babies. Too challenging to the ability
>> to make a living. I had my first audiogram when I applied for
>> a job at the telephone company years ago. It was perfect. Oh,
>> golly.
>>
>> On 6/14/2020 1:36 PM, Michael Hanz wrote:
>>> And as a member of a community symphony orchestra, what he
>>> said - in spades! Those pesky woodwinds and brass in the
>>> back rows...yow! :-)
>>>
>>> I've been able to do some chamber work with 2-3 other string
>>> players outside in masks on a nice day, but it's hard to blow
>>> a trumpet through a mask...
>>>
>>> - Mike
>>>
>>> On 6/14/2020 4:19 PM, Scott Robinson wrote:
>>>> ...and this illustrates why choral singing is unfortunately
>>>> one of the best ways to make others sick. This is a drag for
>>>> me, a choral singer the last 63 years.
>>>>
>>>> Stay healthy,
>>>>
>>>> Scott Robinson
>>>>
>>>>> On 6/14/2020 11:54 AM, Michael Hanz wrote:
>>>>>> That pretty much aligns with my view, Scott, with the
>>>>>> addition of information from an interesting study about
>>>>>> aerosols produced by simply "normal" talking, reported at
>>>>>> https://www.nytimes.com/2020/05/14/health/coronavirus-infections.html
>>>>>> (The National Academy of Sciences detailed report is at
>>>>>> https://www.pnas.org/content/117/22/11875 ).
>>>>>>
>>>>>> The gist of the article was:
>>>>>> "To see how many droplets are produced during normal
>>>>>> conversation, researchers at the National Institute of
>>>>>> Diabetes and Digestive and Kidney Diseases and the
>>>>>> University of Pennsylvania, who study the kinetics of
>>>>>> biological molecules inside the human body, asked
>>>>>> volunteers to repeat the words “stay healthy” several
>>>>>> times. While the participants spoke into the open end of a
>>>>>> cardboard box, the researchers illuminated its inside with
>>>>>> green lasers, and tracked bursts of droplets produced by
>>>>>> the speaker.
>>>>>>
>>>>>> The laser scans showed that about 2,600 small droplets
>>>>>> were produced _per second_ while talking. When researchers
>>>>>> projected the amount and size of droplets produced at
>>>>>> different volumes based on previous studies, they found
>>>>>> that speaking louder could generate larger droplets, as
>>>>>> well as greater quantities of them.
>>>>>>
>>>>>> Although the scientists did not record speech droplets
>>>>>> produced by people who were sick, previous studies have
>>>>>> calculated exactly how much coronavirus genetic material
>>>>>> can be found in oral fluids in the average patient. Based
>>>>>> on this knowledge, the researchers estimated that a single
>>>>>> minute of loud speaking could generate at least 1,000
>>>>>> virus-containing droplets."
>>>>>>
>>>>>> Here's a picture of the test setup:
>>>>>>
>>>>>>
>>>>>> That makes it even more than a courtesy to wear a mask,
>>>>>> especially since most coronavirus spreaders aren't even
>>>>>> aware when they are in the early stages of their
>>>>>> infection. The cloth masks are indeed not perfect, but
>>>>>> they are only intended to reduce the frequency of the much
>>>>>> larger droplets, not the much smaller virus which is
>>>>>> attached to them.
>>>>>>
>>>>>> - Mike KC4TOS
>>>>>>
>>>>>>
>>>>>> On 6/14/2020 2:00 PM, Scott Johnson wrote:
>>>>>>> I consider the primary reason for masks, or bandanas, or
>>>>>>> whatever, not to
>>>>>>> protect yourself, but to protect other from you. It is a
>>>>>>> courtesy, if you
>>>>>>> sneeze, cough, or slobber when you talk, it effectively
>>>>>>> prevents the aerosol
>>>>>>> from going further than the fabric. Not wearing anything
>>>>>>> in proximity to
>>>>>>> the public identifies one as careless and reckless. If
>>>>>>> you are in a high
>>>>>>> risk group, and truly worried about your own safety, then
>>>>>>> you shouldn't be
>>>>>>> exposing yourself needlessly. I have heard so many
>>>>>>> opinions, some that are
>>>>>>> diametrically opposed, and all from supposed experts.
>>>>>>> Don't care to hear
>>>>>>> any more. Common sense coupled with common decency should
>>>>>>> prevail. BTW, one
>>>>>>> of my engineers did a CFD model in Solidworks of a sneeze
>>>>>>> in a room with
>>>>>>> closed loop HVAC. It propogates and dissipates pretty
>>>>>>> much like a fart.
>>>>>>>
>>>>>>> Scott V. Johnson W7SVJ
>>>>>>> 5111 E. Sharon Dr.
>>>>>>> Scottsdale, AZ 85254-3636
>>>>>>> H (602) 953-5779
>>>>>>> C (480) 550-2358
>>>>>>> scottjohnson1 at cox.net
>>>>>>> scott.johnson at ieee.org
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From:arc5-bounces at mailman.qth.net
>>>>>>> <arc5-bounces at mailman.qth.net> On Behalf
>>>>>>> Of Hubert Miller
>>>>>>> Sent: Saturday, June 13, 2020 11:21 PM
>>>>>>> To:arc5 at mailman.qth.net
>>>>>>> Subject: Re: [ARC5] AB5S Kung Flu Update, 13 June - source?
>>>>>>>
>>>>>>> Generally good advice, but I question the non-cough
>>>>>>> non-sneeze 26 foot
>>>>>>> business, no matter what your doctor said.
>>>>>>> I have read several articles in the New York Times
>>>>>>> precisely on this
>>>>>>> question, and those articles are well informed, very well
>>>>>>> informed,
>>>>>>> frequently updated. Ask your doctor his source for his
>>>>>>> information. I recall
>>>>>>> now they also had an article comparing actual
>>>>>>> effectiveness of different
>>>>>>> kinds of masks, both homemade and commercial, and gave
>>>>>>> actual numbers
>>>>>>> compared to N95, and what thickness required even with
>>>>>>> homemade.
>>>>>>> Also, masks are dry material, so what is your informed
>>>>>>> reckoning of how long
>>>>>>> virus lives on them ?
>>>>>>> As for health professionals dying despite masks, well,
>>>>>>> you would have to
>>>>>>> know the extent of their exposure and their full suiting
>>>>>>> equipment to assign
>>>>>>> this to mask inefficiency.
>>>>>>> Don't forget UV exposure either, to kill virus. These
>>>>>>> parameters apply
>>>>>>> outside also.
>>>>>>> I found Elderberry anything to be pretty much sold out
>>>>>>> locally last time I
>>>>>>> shopped, but I'll take another look in the next days.
>>>>>>> -Hue Miller
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ______________________________________________________________
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>>>>>>>
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>>>>>>
>>>>>> --
>>>>>> Michael Hanz - KC4TOS
>>>>>>
>>>>>> ______________________________________________________________
>>>>>>
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>>>>>
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>>>
>>
>
> --
> Michael Hanz - KC4TOS
--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
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