ridgeguy

13 ms·

121.
by ridgeguy 3y ago
It is at least possible that the gear collapsed due to an attempt to turn onto a taxiway too sharply, at too high a speed. I'll wait for the investigation results. https://avherald.com/h?article=515e3618&opt=0
122.
by ridgeguy 3y ago
Some of the instrumentation wire harnesses were wrapped in foil, which got ripped off by air currents driven by the exhaust plume. Foil wraps shield against heating by IR radiation from the plume. It's cheap but effective.
123.
by ridgeguy 3y ago
Fabulous, thanks. Great to learn how ASML gets around wavelength and numeric aperture limits - just gotta see a different angle on the problem!
124.
by ridgeguy 3y ago
It's potentially against the law.
125.
by ridgeguy 3y ago
Difference between USAF and USN landing techniques: https://www.youtube.com/shorts/KLAOPg6AxFM
126.
by ridgeguy 3y ago
Piker. A rich, truly obsessive audiophile wouldn't use copper, but rather 6nines annealed silver wire for those speakers.
127.
by ridgeguy 3y ago
Moisture in machines can be a very expensive issue. https://en.wikipedia.org/wiki/2008_Andersen_Air_Force_Base_B...
128.
A Cosmic Christmas Tree(nasa.gov)
2 points by ridgeguy 3y ago|0 comments
129.
by ridgeguy 3y ago
This: https://wiki.c2.com/?NamShubOfEnki
130.
by ridgeguy 3y ago
Wow. Toxoplasmosis? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3035534/
131.
by ridgeguy 3y ago
Thomas Piketty would like a word.
132.
by ridgeguy 3y ago
This report reminded me of the Seven Suns artifact in A. C. Clarke's The City and the Stars [1]. OK, this is planets, not stars, but it's cool that Clarke anticipated this apparently stable configuration. [1 https://en
133.
by ridgeguy 3y ago
And if you're in the D.C. area, Gravely Point is the place for this. Feels like you can count the rivets for planes on either departure or landing.
134.
by ridgeguy 3y ago
We may be of a similar age cohort. I vividly recall my parents' mounting anxiety as three of our neighborhood kids were stricken and put in iron lungs. One died (age 4), two recovered (ages 5 & 6) after around 6 months in hospital.
135.
by ridgeguy 3y ago
Starship re-entering over Puerto Rico: https://twitter.com/eliassob/status/1725871782186381474
136.
by ridgeguy 3y ago
There are cheap handheld thermal conductivity testers that will immediately distinguish diamond from moissanite and other stimulants.
137.
by ridgeguy 3y ago
No, U235 weapons can be the 'cannon' type. That was the type of bomb used on Hiroshima.
138.
by ridgeguy 3y ago
Find My came to the rescue when my wife unknowingly dropped her phone during a pullover to take some pix. The turnout was on New Priest Grade, the best way to Yosemite from our home. Next morning, after the frenzied "Where's my ph
139.
by ridgeguy 3y ago
Alternate, works for me. https://archive.ph/u3HmK
140.
by ridgeguy 3y ago
You may be thinking of nitromethane.
141.
by ridgeguy 3y ago
Wikipedia says no efforts to measure the mass of 33 Polyhymnia have been made since 2012. The scientist who estimated its mass at that time regarded the result as nonphysical and in error. Couldn't this mass be much more accurately est
142.
by ridgeguy 3y ago
I'll speculate this is phase-controlled microwave cooking. Microwave power transistors are now cheap at high power levels. If you have an array of such emitters, you can synthesize beams that can deposit energy in small, local volumes.
143.
by ridgeguy 3y ago
They would be decoupled from immediate earthquake effects, but not from subsequent tsunamis. Had there been such a ship moored off the Tohoku region of Japan in 2011, there would have been less than an hour to mitigate damage. Not even enou
144.
by ridgeguy 3y ago
The prices of synthetic stones have been eroding rapidly [1] as more makers come online. I'm aware of two factories ex-USA, one with ~700 CVD systems, the other with ~900 systems. Each system yields raw material for ~25 1+ct finished g
145.
by ridgeguy 3y ago
On the other hand, the Swedes.... https://en.wikipedia.org/wiki/Surströmming
146.
by ridgeguy 3y ago
Energy is (1/2) (mass) (speed)^2. That ^2 term is important.
147.
by ridgeguy 3y ago
Yeah, the materials issues dominate design basics. They've looked at HfC and HfCN as nuclear engine materials (m.p. ~3950°C), pretty exotic. I feel like if designers would drop their effort to wring out the last increment of Isp from n
148.
by ridgeguy 3y ago
It's the high temperature and the lower exhaust molecular weight. Specific impulse (Isp) is how much force you get from each mass unit of propellant you exhaust. So an engine with Isp = 300 gives 300lbs force for every pound of exhaust
149.
by ridgeguy 3y ago
Could be, and good idea. If they're processing in a vacuum to avoid N2 and/or O2 and/or H2O chemistry, then a dry inert gas might be useful. Heating above 100°C to drive off H2O, followed by a purge with dry Ar might give the
150.
by ridgeguy 3y ago
I've looked briefly at the materials synthesis (first part of their Supplementary Materials section). I agree with you, the synthesis is trivial. The 10e-5 vacuum is easily reached with a turbopump backed by a mechanical pump, nothing

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