SEJeff

86 ms·

961.
by SEJeff 7y ago
*with the help of Pakistan
962.
by SEJeff 7y ago
Elon recently stated the phased array antennas for Starlink will be the most advanced phased array antennas in the world. That's saying something as the AESA radars in the newer jets use phased array radars + antennas.
963.
by SEJeff 7y ago
Which are paper rockets until they actually launch, land, and refly successfully.
964.
by SEJeff 7y ago
The SM-6 is anti-air and anti-ship. It has the option to add GPS guidance to it (SM-6 Block IA and the newer IIA), but it is much more expensive as a Tomahawk and is generally not used for this case. A Tomahawk is around $1.4 million per wh
965.
by SEJeff 7y ago
Yeah, DU has an incendiary property along with a "self sharpening" property. It doesn't mushroom as much when used as a sabot round as tungsten. My platoon sergeant in the US Army was a former tanker and we learned all about
966.
by SEJeff 7y ago
Yes, but not both. You have ground to air, ground to ground, ship to ground, ship to ship. For the most part (with some standouts that do multi-role such as the Tomahawk) each munition is specialized for a single role. The railgun is being
967.
by SEJeff 7y ago
This is precisely my point! As much as one might be morally against military research, it is well funded and bleeding edge. Case in point: I had to get a double bunionectomy when I was in the Army after spending a year in Iraq and got my fe
968.
by SEJeff 7y ago
So perfect for a railgun projectile? :) What is the hardest man-made substance?
969.
by SEJeff 7y ago
Wonderful description.
970.
by SEJeff 7y ago
It means taking out adversarial missiles or aircraft. When they're travelling so fast, they might not need any homing technology. The state of the art F22 Raptor has a top speed with afterburners of Mach 2 for reference. The railgun pr
971.
by SEJeff 7y ago
In the same vein, as an industry, pornography really improved computer storage density and video codecs whereas electronic trading really improved the tech to reduce networking latency. Virtually all engineering benefits from other engineer
972.
by SEJeff 7y ago
Do you not see that materials science from high performance cruise missiles might work its way through other uses of materials science such as structural engineering and bridges? Bridges can be used to hold tanks, does that mean all bridge
973.
by SEJeff 7y ago
But the US Military uses depleted uranium (the hardest material) for tank rounds, so they could make pretty hardy railgun projectiles.
974.
by SEJeff 7y ago
Really hard engineering pushing the limits of physics and materials science is fun, killing people is not.
975.
by SEJeff 7y ago
One of the problems with existing Navy "gun ships" is that explosive ordinance can be a hazard to sailors and has to be handled very carefully. Additionally, it has to be stored very carefully. One of the things a railgun hypothet
976.
US Navy's Railgun Now Undergoing Tests in New Mexico(thedrive.com)
156 points by SEJeff 7y ago|265 comments
977.
Nilometer: An ancient instrument used to measure the waters of the Nile(atlasobscura.com)
2 points by SEJeff 7y ago|0 comments
978.
Debunking myths of high performance computing and Linux containers(permalink.lanl.gov)
2 points by SEJeff 7y ago|0 comments
979.
by SEJeff 7y ago
This so much ^
980.
by SEJeff 7y ago
Tesla has CCS adapters though, so more EVs are still good for Tesla as well.
981.
by SEJeff 7y ago
In the US, Ionity has what, about 100 stations currently out of approximately 500 planned stations? There are 668 Tesla superchargers currently open in the US alone and 20 were opened this month alone per: https://supercharge.inf
982.
by SEJeff 7y ago
Go ahead and find the EVs that aren't Tesla that beat the 2012 Model S's 265 miles of range and are on the market right now. They don't exist. The 2020 Porsche Taycan (300 miles), 2020 Mercedes EQC (293 miles), 2019 Audi E-Tr
983.
by SEJeff 7y ago
Will big auto magically have a network to charge on, or a lot of patents on it? Tesla famously "open sourced" some of their patents, on electric drivetrain, but they also didn't open source their battery chemistry patents or
984.
by SEJeff 7y ago
That isn't an option for 90% of the country (in the US at least).
985.
by SEJeff 7y ago
> Chicxulub has been estimated as at least 20 billion Hiroshimas - and perhaps as much as four times that. That set fire to most of a hemisphere. And it still wasn't a complete obliteration/sterilisation event. Unless you were
986.
by SEJeff 7y ago
Horrible mental exercise... As localized as a 700 megaton nuke (compared to the 13-18 kiloton nuke that his Hiroshima). Reliable sources say that virtually everything within a 3 mile radius from the impact was heavily damaged in Hiroshima a
987.
by SEJeff 7y ago
We also have much cheaper and more reliable access to space. SpaceX and eventually Blue Origin will continue to push this down significantly. The one downside of this is that the same types of tools in space to deflect asteroids would be qu
988.
by SEJeff 7y ago
Yeah this is the most sensible reason against it. NTP is also responsible for some of the biggest traffic amplification DDoS events.
989.
by SEJeff 7y ago
Yeah I agree, but ptpv2 does support unicast and you can set offsets. It would be very challenging, but not impossible sans the very high res stuff where you need oscillators on the switches and routers, as you alluded to. It wouldn't
990.
by SEJeff 7y ago
I think it would be super interesting if they started offering IEEE 1588 v2 aka Precision Time Protocol, but it would be much harder to offer compared to ntp. What they're almost certainly doing here is just running a cable to the roof

More ›