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

Scott Robinson spr at earthlink.net
Sun Jun 14 19:58:02 EDT 2020 

I am told by a rock'n'roll drummer that they lose hearing in their right 
ears, since the cymbal is on that side.

/scott

On 6/14/20 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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>>>>>>
>>>>>> -- 
>>>>>> Michael Hanz - KC4TOS
>>>>>>
>>>>>> ______________________________________________________________
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>>>>>
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>>>
>>
> 
> -- 
> Michael Hanz - KC4TOS
> 
> 
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