tullianus

9 ms·

1.
by tullianus 8mo ago
Unfortunately this is not the case. The amplifiers on the transmit-side phased arrays are about 10% efficient (perhaps 12% on a good day), but the amps represent only ~half the power consumption of the transmit phased arrays. The beamformer
2.
by tullianus 2y ago
The current slate of Russian GPS jamming is not being done by satellites.
3.
by tullianus 2y ago
The jammer under discussion is not a satellite. It is a ground-based system that jams satellites. Did you read the article? There's even a photo of the system right at the top.
4.
by tullianus 2y ago
God I keep coming back to them using photos of twins for the children. Imagine taking this study. You're shown a photo of a kid. Does he look more like a John, Paul, George, or Ringo*? You click John. Two photos later you're
5.
by tullianus 2y ago
The paper is here: https://www.pnas.org/doi/10.1073/pnas.2405334121 No way does this replicate. * Calling p = 0.062 "marginally significant" (Study 1, child perceivers, adult targets) rings my alarm bell
6.
by tullianus 2y ago
That would have helped a lot! Using a high-conductance device to transport heat away from the hot side before switching to lower-conductance devices for heat rejection. All I can say is that my thermal philosophy wasn't as robust bac
7.
by tullianus 2y ago
Tried to use one of these in a space application once: cold side on the sensor, hot side attached directly to a radiator. Unfortunately the thermal conductance [W/°C] from the hot side back to the cold side was high enough (relative t
8.
by tullianus 2y ago
Yes, although in practice you will have issues sinking heat at 0K without using additional energy to do so, since that's below the radiation sink temperature of space (~2.73K).
9.
by tullianus 2y ago
Cerium is common in solar coverglass used in space, but I'm not sure I've heard of it being used for terrestrial applications.
10.
by tullianus 3y ago
It means "tornado," referencing the 1939 film "The Wizard of Oz." The Kansan protagonist is transported by a sudden tornado to a magical land called Oz.
11.
by tullianus 3y ago
"Affected" is a strong term. The line along which re-entry was predicted to occur is three times the circumference of the Earth (as you can see in the OP article), and a small fraction of that line passes through the borders of G
12.
by tullianus 3y ago
https://archive.is/K51TH
13.
by tullianus 3y ago
https://archive.is/ad0wU
14.
by tullianus 3y ago
Helmet-mounted rearview mirror. Looks like the little mirror they use at the dentist's office.
15.
by tullianus 3y ago
Only partly thanks to overall budget inaction in Congress. The bigger cause in my opinion is Congress proposing huge reductions in Mars Sample Return program funding or outright cancellation [1], which is currently supporting a lot of peop
16.
by tullianus 3y ago
You're describing a Control Moment Gyroscope (CMG), famously used on the ISS. They have very high torque output per unit power and mass/volume. They and reaction wheels (fixed axis of rotation) are convenient for spacecraft appl
17.
by tullianus 3y ago
Starlink is not a separate company from SpaceX
18.
by tullianus 3y ago
The people the DOJ claims are discriminated against (asylees and refugees) can't vote. The issue is SpaceX claiming they can only hire citizens (who can vote) and permanent residents (who can't vote).
19.
by tullianus 3y ago
A few, yes: https://en.wikipedia.org/wiki/Placentalia
20.
by tullianus 3y ago
https://archive.is/HWgCM
21.
by tullianus 3y ago
SpaceX (at least in my experience) requires design and manufacturing engineers to spend shifts on the production line to make sure there isn't low-hanging fruit in improving either the design or the manufacturing flow. If your manager
22.
by tullianus 4y ago
Counterfeit nutmegs (made of wood) were at minimum widely feared at some points in history: https://www.mentalfloss.com/article/94734/why-early-america-...
23.
by tullianus 4y ago
New players and stretchable diplomacy period length :)
24.
by tullianus 4y ago
I think this might be a strength of Diplomacy for current AI models - making contradictory plans with two different players is a perfectly normal human move, as is saying one thing and doing another, as is cooperating on round N and defecti
25.
by tullianus 4y ago
Two features that make Diplomacy particularly bad: 1. Length. An in-person game can last easily 12 hours, and is mentally exhausting. Getting 10 hours in and THEN getting screwed by your friend feels worse than a game with less time inves
26.
by tullianus 4y ago
The effect of downward-pointing black coatings on LEO satellites is higher spacecraft temperatures, but the cost of those higher temperatures is on spacecraft design/use, not on IR astronomy. Starlink satellites run screamingly hot ev
27.
by tullianus 4y ago
> However, the details of the Harvard interpretation do not stand up to scrutiny. There is no evidence that Kaczynski read most of the authors whom Chase and Corey cite as his influences, and there is some evidence that Kaczynski did not
28.
by tullianus 4y ago
Oh, there are plenty of US satellites with classified payloads/missions; I just mean that most classified US satellites DO have orbital elements listed in the Space Force catalog.
29.
by tullianus 4y ago
That capability was transferred to the Space Force recently. They make their data publicly available here: https://www.space-track.org/
30.
by tullianus 4y ago
Often you can figure out what spacecraft/rocket a piece of debris came from with a good catalogue of orbits and some math - these are labeled "Debris." Often you just can't - these are labeled "Unknown." The U

More ›