iiinova — where your digital self keeps evolving

Gary Turner @dtaguy.bsky.social · 07/09/2026

I posted a short thread as an add-on to Adam's, too: bsky.app/profile/dtag...

Gary Turner @dtaguy.bsky.social · 05/09/2026

Those reference standards were chosen because the Sound INTENSITY Level in W per square meter at 1 meter is numerically the same as the Sound Pressure Level. The 11 dB is due to the area of a sphere of radius 1 m = 12.57 square meters. Log10(12.57) = 1.099 Bel or 11 dB. /End

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Gary Turner @dtaguy.bsky.social · 05/09/2026

For example, it turns out that for an omnidirectional point source with a Sound Power Level of 40 dB radiating into free space (as in an anechoic chamber), the Sound Pressure Level at 1 meter would be approximately 29 dB, an ~11 dB difference. /5

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Gary Turner @dtaguy.bsky.social · 05/09/2026

Sound Power Level, on the other hand, is relative to a standard power level of 1E-12 Watts, or 1 pW. /4

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Gary Turner @dtaguy.bsky.social · 05/09/2026

But Sound Pressure Level is relative to the reference sound pressure in air, commonly taken as 20E-6 Pascals, or 20 microPa. So it's a unit of pressure, and it corresponds to the amplitude of a sound wave, relative to the threshold of human hearing. /3

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Gary Turner @dtaguy.bsky.social · 05/09/2026

Common usage makes it especially confusing, since both Sound Pressure Level and Sound Power Level are abbreviated SPL and expressed in dB. But the two have different UNITS. Not dB; dB is a logarithmic difference (a ratio) and is unitless. /2

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Gary Turner @dtaguy.bsky.social · 05/09/2026

Sound Power Level vs. Sound Pressure Level: David Wong has a nice explanation of the difference on that other site: x.com/Engineer_Won... and here: air-fanta.com/blogs/all/th... Let me expand on it a bit. 🧵/1

x.com

Adam Wong (@Engineer_Wong) on X

One device actually has two decibel numbers. The smaller one makes it into the specs; the larger one makes it into your ears once you plug it in. I break it all down in this article. 👇 https://t.co/75...

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Gary Turner @dtaguy.bsky.social · 24/08/2026

People born too late to have seen this in 1966 probably find it hard to understand how-boggling it was. Most folks then found it astonishing. Especially for me having grown up on Robert Heinlein, and then being a part of this mission as my first full-time job.

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Gary Turner @dtaguy.bsky.social · 14/07/2026

Absolutely brilliant, Nukit!

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Gary Turner @dtaguy.bsky.social · 20/06/2026

I do all that, too, AP on a smart switch, but sometimes it fails to turn on. That's when I've taken data with wall condnstn only, so the nebulizer and mix fan already on. I nip in (whole body) and turn on the AP, out in <20sec, and after only a few 6-second intervals, log data is steeper strt line.

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Gary Turner @dtaguy.bsky.social · 20/06/2026

Not sure how you test, but when I've had this issue, I find I can quickly open the door to my chamber, a small bathroom, adjust, and get back out. I take data every 6 seconds, so I can see any glitches and count only data after they've gone. I was surprised how little the disturbance was.

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Gary Turner @dtaguy.bsky.social · 17/06/2026

I wonder which changed the most; flow or efficiency. I'm guessing efficiency, 'cause the reduction is greatest at the lowest setting.

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Gary Turner @dtaguy.bsky.social · 02/05/2026

What is that real world data?

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Gary Turner @dtaguy.bsky.social · 08/04/2026

Not to disparage the brilliant if unromantic folks at Langley, but the ones who actually built the things were at private companies like Boeing who repurposed a secret earth surveillance wet film camera + kinescope to work for the moon. They got no naming rights & not much glory. Lotsa fun tho!

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Gary Turner @dtaguy.bsky.social · 07/04/2026

The Ranger crater looks pretty symmetrical so not a shallow angle impact. Not surprising since it didn't orbit but just went straight in.I don't know how they de-orbited the LOs.

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Gary Turner @dtaguy.bsky.social · 07/04/2026

Does anybody know what a Lunar Orbiter or Ranger crash site would look like? Size/shape of crater? Would anything of the spacecraft remain? @inverting-vision.bsky.social?

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Gary Turner @dtaguy.bsky.social · 03/04/2026

Nice sleuthing! Hard to believe how bad TV was then. Gonna be so much better quality this time around.

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Gary Turner @dtaguy.bsky.social · 20/03/2026

Increase(d) *urine* volume?

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Gary Turner @dtaguy.bsky.social · 17/03/2026

I agree. I got very good log-linear results with a ratio of room size/CADR about 6x smaller than in this paper by using intervals of 6 seconds vs their 60 seconds. Typically 20 points of so. And I can measure wall deposition just before turning on the purifier. bsky.app/profile/dtag...

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Gary Turner @dtaguy.bsky.social · 17/02/2026

Or the other way around. Unless, of course, a used spleen would actually fix the wiring. 🤣

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Gary Turner @dtaguy.bsky.social · 08/02/2026

I'm all for it. I post rarely, but I post on 🦋 first, then on X. If love to see the IAQ crowd all on 🦋.

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Gary Turner @dtaguy.bsky.social · 02/02/2026

Well, I saw it and I have a morbid fear of catching meals. 😀

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Gary Turner @dtaguy.bsky.social · 25/01/2026

Yeah. I was just bein' testy. 🥴

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Gary Turner @dtaguy.bsky.social · 25/01/2026

Sadly, this post proves no information at all. The ALT text is not live in the image and no source is given. A tiny 2" fan with a tiny HEPA filter meets the definition here, but would have no measurable effect on the aerosol in a room.

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Gary Turner @dtaguy.bsky.social · 09/01/2026

Investment casting (list wax) is used for jet engine turbine blades. I've used it for jewelry.

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Gary Turner @dtaguy.bsky.social · 05/01/2026

I agree, and it's a big pain, but Xitter is unlikely to reform and could decide any time to algo against fans or clean air or science. I keep on here because it can be fixed and it can grow.

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Gary Turner @dtaguy.bsky.social · 05/01/2026

"So a PASSPORT, or a Real ID, are required to fly. We'll just refer to this as a PASSPORT, because we're confident that you know what we mean and it's easier for us."

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Gary Turner @dtaguy.bsky.social · 28/12/2025

OK; I'm stupid. Please explain how I should interpret the circled items. Or are they just red-circled herrings?

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Gary Turner @dtaguy.bsky.social · 18/12/2025

Thanks for your reply, but Chrome link just goes to DLs I've done on my phone from Chrome. The ResearchGate link offers View (abridged version) or Download gives a message that it's unable to DL and suggests checking net connection. But that's OK at 150mbs. Could you send me a copy?

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Gary Turner @dtaguy.bsky.social · 18/12/2025

Where did this paper come from? No journal, no identification of author's affiliation, no data, no tables, no figures. Just assertions.

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Gary Turner @dtaguy.bsky.social · 17/12/2025

It's endorsed by a company that sells only HEPAs (good ones, but only HEPAs). Just use a generic term like high-CADR air purifier. Also, noise is not considered in the calculation, but it's critical for user acceptance.

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Gary Turner @dtaguy.bsky.social · 17/12/2025

This calculator unnecessarily limits air purifiers to HEPA units, often not the most cost-effective kind. Air purifier = HEPA is like beverage = red wine, so eat only dishes that go with red wine. The calculator uses CADR, the right measure but applies to PC-fan-furnace-filter purifiers as well.

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Gary Turner @dtaguy.bsky.social · 16/10/2025

Good. Thanks. I sometimes go to technical seminars in classrooms at a local college and never see masks, purifiers, or UVC. When I asked about CADR in one of their auditoriums, I got the usual "We meet all requirements..." Which tells me they didn't know the CADR and didn't care.

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Gary Turner @dtaguy.bsky.social · 16/10/2025

I didn't see any masks. How is the air quality in a room like that?

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Gary Turner @dtaguy.bsky.social · 24/09/2025

Agreed. But I'll still push for "high CADR", or perhaps "high-CADR/HEPA" since I expect that if air purifiers do become widely adopted, they won't be HEPA, and using only the HEPA term may delay that day.

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Gary Turner @dtaguy.bsky.social · 24/09/2025

I am glad to see you were not intentionally blocked. I agree with your statement, except I think a better term than HEPA is "high CADR", since CADR is a metric while HEPA is only a standard for single-pass efficiency.

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Gary Turner @dtaguy.bsky.social · 05/09/2025

Yes. Accent on ADDITIVE air cleaners.

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Gary Turner @dtaguy.bsky.social · 28/08/2025

🧚🏽‍♀️👍🏽🩷🥰🙏🏽

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Gary Turner @dtaguy.bsky.social · 23/08/2025

Cooler because it's paint, not because it's black, right?

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Gary Turner @dtaguy.bsky.social · 17/08/2025

And less effect with high-wing than low-wing. Would depend a lot on on runway length and width. But right next to the conveyer it's a 60mph headwind.

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Gary Turner @dtaguy.bsky.social · 17/08/2025

I think it takes off even easier than without the conveyer because the conveyer is dragging a headwind. But it would feel weird because that wind would die out very quickly with altitude

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Gary Turner @dtaguy.bsky.social · 05/08/2025

Don't care. Either way, we need to protect.

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Gary Turner @dtaguy.bsky.social · 04/08/2025

I assume a typo. I think you meant: Near-field->respirator masks, Car-field->air filtration.

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Gary Turner @dtaguy.bsky.social · 02/08/2025

Right, caught me. I do know the mercury line, but thought I saw 255 and didn't want to misquote. Then my typo and now I can't find the ephemeral 255. Good thing I don't handle nuclear codes.

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Gary Turner @dtaguy.bsky.social · 01/08/2025

Same website says 555 nm, so more dangerous than 222, but OK if mounted properly. Also claims ozone-free which is good. I like the fans for updraft feed, which is the right way. If the pictures are any guide, the visible blue light would be unpleasant for some rooms. Approval is great.

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