jabl

53 ms·

811.
by jabl 4y ago
Good point. Maybe there's competition from alternative patternings. Like camouflage type patterns for hunters / preppers / military cosplayers. Or high-viz colors for people who worry about safety wrt. various kinds of accide
812.
by jabl 4y ago
Maybe the adaptation would require significantly more advanced visual processing with attendant increase in weight, size, and energy consumption, making it not worth it?
813.
by jabl 4y ago
The usual district heating pipes around here have an inner pipe where the actual hot water is pumped, then about 10cm of some yellowish insulation material (polyurethane?), and then an outer pipe to protect the insulation. AFAIU heat losses
814.
by jabl 4y ago
"Pre composites", doesn't that mean, well, aluminum? That's not particularly hard to work with, no? With composites, well, you can slap together some repair relatively easily, but for more complicated stuff, well you&#x2
815.
by jabl 4y ago
Hypothetically, couldn't they have made a design with both engines right beside each other, and fuel tanks, and pylons for weapons and drop tanks on the outside of the "engine box"?
816.
by jabl 4y ago
Yeah, wikipedia says the Phoenix weighed about 450kg, three times as much as an AMRAAM. And given that the latest versions, like you mention, have a range very close to the Phoenix, and the AMRAAM has been continually developed (presumably
817.
by jabl 4y ago
The author of that piece has a long lecture about NYC steam heating at https://www.youtube.com/watch?v=nkgM0qCy5o4 . Very interesting!
818.
by jabl 4y ago
> A lot of our modern use of energy is inefficient-by-design: the system is designed to 'use as much energy as possible'. Obviously not. Systems are generally designed for lowest total cost of ownership. If fuel is cheap and ca
819.
by jabl 4y ago
The trend in district heating systems is towards lower temperatures. Lower temperatures means that more of the waste heat in the power plant can be extracted, lower heat losses in the piping, and also if using heat pumps then lower temperat
820.
by jabl 4y ago
Yes. There are heat pumps capable of producing steam up to 200C. They are meant for industrial applications, and I think they're a relatively new development so not much used yet.
821.
by jabl 4y ago
Huh, that's surprising. I looked it up and indeed you're correct. Well, oof. Though to be fair I don't now how much of an impediment that is for actually implementing very wide decoders in practice. Hopefully not too bad.
822.
by jabl 4y ago
> In RISC-V, you only need the first two bits of each instruction to determine whether it's a 16 bit or 32 bit instruction Isn't it one bit in the beginning(?) of each 16-bit instruction? So a 32-bit instruction has this inform
823.
by jabl 4y ago
Well, that's what CHERI does, more or less.
824.
by jabl 4y ago
Hypothetically, sure. One can imagine a system getting rid of virtual memory, and instead using e.g. some kind of capability system to prevent programs from reading memory they're not allowed to. In reality, there's so much softwa
825.
by jabl 4y ago
One wonders how many WWII planes were lost in 'freak' accidents like these during the war, the cause never being investigated thoroughly since, heck, there was massive carnage going on all the time in the skies and as long as the
826.
by jabl 4y ago
From reading Ignition, a book about the development of liquid rocket fuels, there was quite a lot of research into using peroxide as an oxidizer. But turns out it's really hard to make it behave during storage.
827.
by jabl 4y ago
I think this came up at a recent panel discussion https://www.climateresolve.org/reflecting-sunlight/ tl;dr: Not an issue. We're not talking about painting roads bright white, it's more like a change from dar
828.
by jabl 4y ago
If the lifetime of a roof is ~20-30 years, in that time we won't have 'solved' climate change, so exceedingly unlikely that you'll need to repaint it for climate reasons at least.
829.
by jabl 4y ago
You know, playing Russian roulette is perfectly safe. I've done it multiple times[1], and look, I'm still here and well. [1] No, not really.
830.
by jabl 4y ago
What's the status of zheap? https://wiki.postgresql.org/wiki/Zheap seems to claim it has been rebased on top of 14.1, but generally progress seems slow? Also https://cybertec-postgresql.github.io/z
831.
by jabl 4y ago
> Intel is demonstrating the capabilities of their fab services including the ip blocks they have available. Oh yes, absolutely. (I was going to mention that earlier, but the edit timer had expired.) But yes, splitting fab service into a
832.
by jabl 4y ago
> No solution to this other than a fixed length encoding. Micro-op caching enters the room. I mean, seriously, micro-op caching has been extensively used for over 20 years, including on ARM64 designs although Apple M1 doesn't have i
833.
by jabl 4y ago
This. I wonder why so many seem so eager to engage in the fantasy that Intel (and AMD) are planning to jump ship to ARM or RISC-V. Yes, ISA's matter, to a point. And yes, ARM64 and RISC-V are much closer to 'best practice' IS
834.
by jabl 4y ago
> Is x86 at the end of the road? No. AMD and Intel are the oligopolistic providers for an unbelievably vast software ecosystem that practically rules all computing outside embedded (and some legacy mainframes here and there), are they go
835.
by jabl 4y ago
> Apple has a perpetual license so they don't have to pay a thing and can do what they want with it. "Everybody" knows that Apple has an ARM architectural license, but AFAIU the terms haven't been disclosed. Presumabl
836.
by jabl 4y ago
I highly doubt that. WWII fighters didn't have the thrust/weight ratio or vectored thrust etc. to pull something like this off. Also due to the much lower thrust/weight ratio energy management was more important in WWII than
837.
by jabl 4y ago
There is a maneuver called 'notching' which is turning perpendicular to an incoming radar guided missile to try to make a doppler radar lose lock. Often used in conjunction with diving to the deck in order to force the missile to
838.
by jabl 4y ago
Well, the R-37M is an absolute monster missile at 600kg, even bigger than the AIM-54 Phoenix at around 450kg. For comparison the AMRAAM is about 150kg. So even if, hypothetically, Russia could sort out their issues with actually producing t
839.
by jabl 4y ago
You can actually conveniently count to 12 with one hand. Use the tip of the finger, the first and second finger joints * 4 fingers = 12. Then use the thumb as the pointer to keep track. A base-12 number system would be advantageous because
840.
by jabl 4y ago
> A lot of the WW2 planes had turrets a separate gunner would control, In WWII unescorted bomber losses were quite catastrophic even with gun turrets pointing in every conceivable direction like the B-17. Ultimately it was long range es

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