Search found 181 matches
- Sun Jul 12, 2009 6:00 pm
- Forum: Design
- Topic: How to remove heat from a copper wire magnet?
- Replies: 27
- Views: 22158
Power dissipation ??
Just curious-- How much power must this dissipate, and what stagnation temperature must it tolerate ?? Can you co-wind some coolant tubing with the coil ? Could you manage with foil or laminates to transfer heat to the mountings ?? Can you break the windings into sections, and remove heat at their t...
- Sat Jul 11, 2009 6:47 pm
- Forum: Implications
- Topic: Implications for Good
- Replies: 68
- Views: 43200
Throttling a polywell...
Bit difficult to answer before 'break-even', but does a polywell prefer to run at constant power, or would it tolerate rapid throttling between low and full power ? There's a lot of peak-power stations that generate expensive but essential power using eg methane & LPG. IIRC, they run on gas-turbines...
- Mon Jul 06, 2009 11:51 am
- Forum: Theory
- Topic: Do Thermal Neutrons Irradiate Their Shielding Water?
- Replies: 16
- Views: 12193
Heavy water...
http://en.wikipedia.org/wiki/Heavy_water
http://en.wikipedia.org/wiki/Girdler_sulfide_process
Except you want the stripped, deutron-free water...
Probably cheaper to junk the reactor from time to time !!
http://en.wikipedia.org/wiki/Girdler_sulfide_process
Except you want the stripped, deutron-free water...
Probably cheaper to junk the reactor from time to time !!
- Mon Jul 06, 2009 11:41 am
- Forum: Theory
- Topic: Does PB11 produce neutrinos?
- Replies: 10
- Views: 5910
Neutrino sensing...
IIRC, there are some rare nuclear isotopes which *may* have a seasonal modulation superimposed on their decay rate. ( There's only a few with half-life in potentially sensitive range, the data rate is very low, the sources of error and interference multiple etc etc ;-) Very, very tentatively attribu...
- Tue Jun 30, 2009 6:46 pm
- Forum: Design
- Topic: Some sci-fi questions
- Replies: 35
- Views: 23416
A bit of googlin' found...
Handbook of Isotopes in the Cosmos: Hydrogen to Gallium By Donald D. Clayton Around p55... http://books.google.co.uk/books?id=22xouHMCc8MC&lpg=PA56&ots=2aP28upOxq&dq=stellar%20boron&pg=PA55 Watch that mega-wrap... My take on it is that Li/Be/B are under-represented because they're destroyed by few m...
- Mon Jun 01, 2009 11:58 pm
- Forum: Implications
- Topic: Polywell and Ionocraft
- Replies: 20
- Views: 43582
Noise...
Um, from what little I've seen of ion-lifters, they *hiss* like electrostatic machines. http://en.wikipedia.org/wiki/Electrostatic_generator http://www.coe.ufrj.br/~acmq/electrostatic.html If scaled, they may resemble cranky HV switchgear, and spit StElmo's Fire all over the neighbourhood. FWIW, eve...
- Fri May 29, 2009 11:14 pm
- Forum: News
- Topic: WB-8 Coming
- Replies: 79
- Views: 48655
Slightly OT...
From long, long ago, when 'Scientific American' was worth reading, I remember an article on 'very high magnetic fields'. IIRC, they ran gamut of cunning field-poles for 'ordinary' electromagnets, pulsed coils, explosive compression and SC systems. Problem with SC was, as this thread states, charging...
- Sun May 10, 2009 11:33 pm
- Forum: General
- Topic: Is Cold Fusion the Answer to America's failing Auto Industry
- Replies: 4
- Views: 17404
Flash Steam...
"And do we really want cars with a bunch of 600 psi or better boilers running in our roads?" Um, would be okay if 'flash steam', when there'd only be ounces of water under high pressure in a thin tube, not pots of it like a power-station. When the tube size is small, you have the counter-intuitive s...
- Sun May 10, 2009 10:52 pm
- Forum: General
- Topic: Ancient Hindu Flying Machines
- Replies: 4
- Views: 2279
ROFL !!
Looks a bit like eg Chinese 'Dragons' and South American 'Feathered Snakes' where each snarl and feather-line has deep ritual significance... Heraldry & Iconography, in other words... IMHO, it's Sanskrit FanFic, their equivalent of StarWars' Technical Manual, complete with HandWavium tiles and Unobt...
- Sun May 10, 2009 10:12 pm
- Forum: General
- Topic: Dim Sun Anyone?
- Replies: 311
- Views: 102530
Slightly OT: Earth's mag field reversals. Also tidal ranges
http://www.physorg.com/news159704651.html “We have found a mechanism that gives simple explanations of many features of the reversals of Earth’s magnetic field,” François Pétrélis of Ecole Normale Supérieure told PhysOrg.com. “In particular, it explains the existence and the shape (slow phase follow...
- Wed Apr 29, 2009 1:51 am
- Forum: Design
- Topic: alternating current
- Replies: 17
- Views: 15256
That's not AC...
That sounds suspiciously like un-smoothed DC... IMHO, not a good idea unless you can run system reliably in pulsed mode at 50 (60) or eg 440 Hz to simplify switching. ( Don't some electric trains run on lower frequencies ??) Hmm: But I must wonder if such un-smoothed DC *could* be used by 'skimming'...
- Sun Apr 19, 2009 12:38 am
- Forum: Theory
- Topic: Centrifugal Forces
- Replies: 2
- Views: 2574
Bump...
Apologies for bump, but question set me to wonder...
Is this a significant issue ? Is it even an issue ?? Sorry, I don't know enough about plasmas to ask a more detailed question...
Is this a significant issue ? Is it even an issue ?? Sorry, I don't know enough about plasmas to ask a more detailed question...
- Sun Mar 22, 2009 1:35 am
- Forum: Theory
- Topic: Magnetic Monopoles
- Replies: 10
- Views: 6326
Vanishingly rare...
http://en.wikipedia.org/wiki/Magnetic_monopole
Elsewhere, I found a comment that magnetic monopoles must not exceed 1 in 10^29 nucleons else we'd have noticed their effects...
A perhaps whimsical comment argued, "Sure, they exist-- But the first Galactic-centre black holes swept them up"...
Elsewhere, I found a comment that magnetic monopoles must not exceed 1 in 10^29 nucleons else we'd have noticed their effects...
A perhaps whimsical comment argued, "Sure, they exist-- But the first Galactic-centre black holes swept them up"...
- Wed Mar 18, 2009 3:54 pm
- Forum: Theory
- Topic: polywell reactor for booster rocket applications?
- Replies: 60
- Views: 34285
Test-ban treaties...
"... nothing more has been officially heard about them" IIRC, NERVA and related projects fell victim to various test-ban treaties. One spin-off from those nuclear aircraft studies was a direct-cycle nuclear ram-jet proposal. Come armageddon, a dozen of these would go critical, launch on boosters, th...
- Wed Mar 18, 2009 12:19 am
- Forum: Theory
- Topic: polywell reactor for booster rocket applications?
- Replies: 60
- Views: 34285
Semi-OT...
Hi, here's a link with some info on nuclear powered aircraft designs. There's enough info in thumbnails to tease, but google may find more on a specific design without buying an UpShip data CD... http://www.up-ship.com/drawndoc/drawndocair.htm And Reaction Engine's home page... http://www.reactionen...