Search found 1142 matches

by 93143
Sat Sep 09, 2023 4:10 am
Forum: General
Topic: X-ray mitigation in nuclear shaped charges
Replies: 0
Views: 921

X-ray mitigation in nuclear shaped charges

Anyone here know anything about Orion- or Casaba-Howitzer-style shaped charge design and how it scales (or doesn't) to the multi-megaton range? I'm trying to figure out if it's actually possible to get to Proxima Centauri in a human lifetime using the Orion concept. The yield-to-weight ratio of the ...
by 93143
Sat Aug 26, 2023 6:54 am
Forum: News
Topic: National Ignition Facility
Replies: 27
Views: 15921

Re: National Ignition Facility

Livermore was supposedly working on this in the '50s. Apparently the original idea was to use a large cave full of water with clean H-bombs; one bomb would run the turbines for a week. Eventually the project converged toward a much smaller bomb with a non-nuclear trigger in a purpose-built chamber. ...
by 93143
Tue Jul 25, 2023 10:08 pm
Forum: News
Topic: Helion Energy to demonstrate net electricity production by 2024
Replies: 660
Views: 104334

Re: Helion Energy to demonstrate net electricity production by 2024

Based on the interviews I've watched and my own engineering experience, I suspect a 30,000 foot view of a Helion plant is going to look something like this: https://photos.google.com/photo/AF1QipPGgN63lY5SyUDKgDRsHl3Q61muJLSK5cYaJumt I can't see that image. I tried to open it in a new tab, and it a...
by 93143
Thu Mar 16, 2023 3:35 am
Forum: News
Topic: The Sun
Replies: 9
Views: 2284

Re: The Sun

I can see both of those.
by 93143
Tue Mar 14, 2023 9:30 pm
Forum: News
Topic: The Sun
Replies: 9
Views: 2284

Re: The Sun

PolyGirl wrote:
Mon Mar 13, 2023 2:34 am
Nice Image!
The image in your post is broken for me.
by 93143
Thu Feb 02, 2023 4:19 am
Forum: News
Topic: World-first "impossible" rotating detonation engine fires up
Replies: 15
Views: 9610

Re: World-first "impossible" rotating detonation engine fires up

It isn't a new concept. My department was doing simulations of this technology over 15 years ago.

Good to see it's making progress...
by 93143
Wed Feb 01, 2023 12:00 pm
Forum: News
Topic: World-first "impossible" rotating detonation engine fires up
Replies: 15
Views: 9610

Re: World-first "impossible" rotating detonation engine fires up

And if you are interested you can give a look to the experiments going on in the next iteration of detonation engines, the "Oblique Detonation" engine. This has a theoretical ISP of 1800 and could give a practical ISP of 1500. That's an air-breathing concept. You aren't getting 15 km/s exhaust out ...
by 93143
Sun Dec 26, 2021 7:34 am
Forum: General
Topic: Happy Holidays!
Replies: 9
Views: 3048

Re: Happy Holidays!

Merry Christmas, everybody!
by 93143
Fri Nov 27, 2020 10:31 pm
Forum: News
Topic: Creating a magnetic field at a distance
Replies: 11
Views: 8090

Re: Creating a magnetic field at a distance

And Lentz (2020) explicitly suggested confined plasma as a gravitational source in his energy-condition-respecting superluminal soliton. It is an interesting theoretical paper but energy requirements for now are in the same range as Alcubierre drive, so it is out of our technological testing possib...
by 93143
Fri Nov 27, 2020 8:14 am
Forum: News
Topic: Creating a magnetic field at a distance
Replies: 11
Views: 8090

Re: Creating a magnetic field at a distance

I was thinking warp drive. I've often thought that if anything like the Woodward theory is possible, a very little confined plasma could in principle be excited to produce significant gravitational effects. And Lentz (2020) explicitly suggested confined plasma as a gravitational source in his energy...
by 93143
Wed Nov 25, 2020 2:04 pm
Forum: News
Topic: Creating a magnetic field at a distance
Replies: 11
Views: 8090

Re: Creating a magnetic field at a distance

Physical Review Letters: https://journals.aps.org/prl/abstract/1 ... 125.177204

Better?

Yes, it's paywalled, but you can at least read the abstract for free...
by 93143
Sun Dec 01, 2019 1:15 am
Forum: News
Topic: Dark matter theories
Replies: 35
Views: 44984

Re: Dark matter theories

F/m = GM/r²

M = 100000000000 kg
G = 0.0000000000667408 m³/kg·s²
r = 0.001 m

F/m = 6674080 N/kg

r = 1 m
F/m = 6.67408 N/kg
m = 70 kg
F = 467.1856 N = 105 lbf

These things could be really dangerous...
by 93143
Sat Oct 29, 2016 3:35 pm
Forum: General
Topic: boostrapping a mars colony
Replies: 71
Views: 42834

Re: boostrapping a mars colony

Technically the original 6502 was NMOS (as was the unlicensed clone in the Famicom/NES, if I'm not mistaken). The CMOS version was the 65C02, and it fixed a few bugs as well as tossing out the undocumented opcodes in favour of additional "real" opcodes. My experience, such as it is, is with the 5A22...
by 93143
Tue Aug 30, 2016 7:20 am
Forum: General
Topic: An Interesting SETI Candidate in Hercules
Replies: 6
Views: 6432

Re: An Interesting SETI Candidate in Hercules

https://en.wikipedia.org/wiki/Kardashev_scale

Is there a type of stellar maser that produces a single peak at ~11 GHz?
by 93143
Sat Aug 06, 2016 9:43 pm
Forum: General
Topic: Freon moderated reactor
Replies: 15
Views: 13308

Re: Freon moderated reactor

That is the big advantage of a NERVA style motor: it really doesn't care what type of "fuel" you push through it, as long as it doesn't interfere with the heating process. Since no one else has mentioned it, I'll just note that this is entirely untrue, for two separate reasons, neither of which has...