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No antennae radiate all the power fed to them!
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No antennae radiate all the power fed to them!
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No antennae radiate all the power fed to them!
rickman wrote in :
Hmmm... All things emit energy according to their temperature and their surface emissivity. All things also absorb energy according to their surface emissivity. Both processes are going on at all times. So an object loses or gains heat depending on its temperature and the temperature of the environment. That delta temperature sets the rate along with the surface emissivity. Ok, that works for me. I guess the rate of change is exponential just as energy loss in a fading note from a stretched string, roughly reaching equilibrium when it can't lose more energy to ambient conditions. About warming of superconductors out there, I may be wildly underestimating the effect of a difference of 77K. What's I'd thought of was that if a supeconductor can only operate at a very low temperature, its thermal emission will be low; perhaps so low that it might take very little input (from whatever, I know not what, and especially so if its emissivity is high making absorbtion easy) to balance that and stop it staying cold enough. My difficulty comes from not being sure whether a difference of 77K means the same thing at cryogenic temperatures as it does around room temperature, because it's not an infinite continuum of temperature. I was thinking that because it is so cold, that small amounts of heat lost from other equipment, might find their way to a superconductor and cause bother in the absence of forced cooling. I can't really imagine any use of superconductors in space that would not include the risk of local heat sources. |
No antennae radiate all the power fed to them!
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No antennae radiate all the power fed to them!
"Brian Reay" wrote in message
... I doubt the casual reader would give his muddled nonsense the time of day, especially if they read the other stuff he posts. Although you try to lay the blame at my door, there can be no doubt that it is from your own keyboard that the gratuitous abuse originates. |
No antennae radiate all the power fed to them!
On 11/3/2014 4:24 AM, Lostgallifreyan wrote:
wrote in : It would be called a scene from The Big Bang Theory; a speaker covered with plastic wrap with a water and corn starch mixture. That's no answer. It describes a method already decribed by me, not a result, let alone a conclusion. I've thought about it a bit though, last night waiting to sleep. I'm guessing that the static patterns formed are not the standing wave itself, but redistributions of the particles in the fluid into nodes in the wave due to differences in pressure. Uh... "The Big Bang Theory" is a television show... -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
No antennae radiate all the power fed to them!
Jerry Stuckle wrote in news:m37qbe$pgl$1@dont-
email.me: Uh... "The Big Bang Theory" is a television show... I discovered that much. But only after I'd searched a bit for Faraday waves. |
No antennae radiate all the power fed to them!
Jerry Stuckle wrote in news:m37qbe$pgl$1@dont-
email.me: Uh... "The Big Bang Theory" is a television show... Btw, I don't watch TV. :) I just got done telling the TV license people that too. Every two years or so they decide not to beleive me despite the fact that any time they visited over 15 years, the cut cable has been plastered by the same old paint on the outside front wall every time. I'm fine with radio (and first thought that Big Bang thing might have been a movie. I don't see many of those either. The last several show series I have came off eBay on disks.) |
No antennae radiate all the power fed to them!
On 11/3/2014 8:53 AM, Lostgallifreyan wrote:
Jerry Stuckle wrote in news:m37qbe$pgl$1@dont- email.me: Uh... "The Big Bang Theory" is a television show... Btw, I don't watch TV. :) I just got done telling the TV license people that too. Every two years or so they decide not to beleive me despite the fact that any time they visited over 15 years, the cut cable has been plastered by the same old paint on the outside front wall every time. I'm fine with radio (and first thought that Big Bang thing might have been a movie. I don't see many of those either. The last several show series I have came off eBay on disks.) I don't watch The Big Bang Theory, but I do enjoy some of the old shows. The 60's "Man from U.N.C.L.E." is on Sunday nights now. And we enjoy a movie now and then. At around $50 for two to go to a movie (parking, admission, popcorn, drinks) here, we don't go to many theater movies. Although I wish we had seen "Gravity" in 3D. Saw it on HBO a couple of weeks ago and, while I didn't think the story was that good, the special effects were great. Would have been even better in 3D. -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
No antennae radiate all the power fed to them!
Jerry Stuckle wrote in news:m38235$pqa$1@dont-
email.me: Although I wish we had seen "Gravity" I so want that one! It's one of the few on my imaginary list of must haves. Add to that all the Doctor Who shows since series four of the new ones, plus the Tom Baker and Jon Pertwee shows, and the last series of House. Last time I saw a movie in a thetre, it was Matrix II (packed) and a week earlier, Johnny English (empty but for two people other than me). Johnny English was the better show. :) |
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