[ARC5] AB5S Kung Flu Update, 13 June - source?

Michael Hanz aaf-radio-1 at aafradio.org
Sun Jun 14 18:25:29 EDT 2020 

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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>>>>>
>>>>> -- 
>>>>> Michael Hanz - KC4TOS
>>>>>
>>>>> ______________________________________________________________
>>>>> ARC5 mailing list
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>>>>
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>>
>

-- 
Michael Hanz - KC4TOS

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