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Physics, Astronomy & Cosmology / Re: Is there a substance where entropy decreases at higher temperature?
« on: 17/12/2022 16:42:12 »
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It has been argued that the failure of the Nazi nuclear program was due to the insistence of someone in authority (I forget who) that graphite could not be used as a moderator, so any reactor experiments had to be carried out with heavy water. The only bulk source was the Rjukan hydroelectric plant, sabotaged by a remarkable group of patriots and adventurers.I personally believe the German scientists did a good bit of subdifuge, the Nazis by the end of the war where under the impression a nuclear weapon was impossible with uranium, most was sent for high density impactors for guns, some was shipped to Japan for the same purpous. They spent a vast fortune developing wacky weapons but gave up on the bomb.
Now there's a "what if" for you!
This might amuse those of a mathematical persuasion.I believe it is possible with roman numerals.
We have a novelty advent calendar. For anyone brought up in a different faith, it counts down the days from 1 to 25 December. Ours consists of two numbered wooden cubes which you can rearrange to display every integer from 25 to zero.
What numbers are painted on each cube?
"what ifs" are utterly pointless in retrospect. What if the big bang never happened?Not really, it's called learning from you mistakes. What if Europe aligned into a common defence collective would that stop invasion by soviet aggression such as Hungary succumbed to.
30/25 > 1, so it's a net energy source, and potentially worth developing if you can harvest the surplus and use it to start another event. Slight problem that this is a pulse process rather than a continuous burn, but the internal combustion engine seems to have survived and still competes with turbines.If that's how you measure it, that's how you measure it.
The cavity magnetron certainly made airborne radar a lot more compact, but the Nazis had a perfectly serviceable system too. The European theater was quite different from the Pacific, as I outlined in reply #3 above.What if the uranium that was stockpiled and withheld from the Germans by an enteprising mining manager in South Africa was sunk en route to the US by the wolf packs that where not destroyed. What if Japanese u boats sunk the indionapolis en route to the Marianas rather on the return leg?
Why this enthusiasm for using NRI research machines for power generation the efficiency is about 0.01% and the fuel extremely expensive ?It all comes dow do you define efficiency, energy in the fuel, energy in the pulse, eneryin the total operation, energy generated or energy in the entire set up versus energy harvested.
Lasers can theoretical turn microwave to photon, there are filters that can change infra red to blue, as seen in confinement fusion.
I was going to suggest the same, but can’t find an example of optical to microwave redshift. Haven’t had a lot of time, will give so e thought next week.
Yes, they can be worthwhile if you want to set up a society in the forests without any human intervention, then it is one of the only few choices.You would need to cut the trees down 1st.
I'm missing something? Well, the original claim of this entire thread was that it took 2560 kg of CO2 to make 1 kW of solar panels:Strange, other people like Michael Moore say different. If only there was some sort of government or European industry standard.
https://www.linkedin.com/pulse/rapid-fall-solars-embodied-carbon-chris-worboys
That is probably very close to the truth. Obviously it was decades ago, but the link between the part of the brain functioning whilst playing computer games and asleep must be very close.If I play too much computer games I dream in colour of playing the computer game in the colour of the computer game.
And then in the Dream state of playing the Computer Game,
Sounds like some sort of field that becomes activated somehow, producing a particle.A "particle" that is everywhere all the time isn't very particulate, is it?But a particle that could be anywhere at any time but only interacts at one point and one time, is neatly described by Schrodinger and Planck, properly understood.
As shown last night, the winner will be the referee, and the cup will be awarded to the highest bidder.No, that was Qatar in Europe Alan.
Unless you have hydroelectric electricity gas is always far cheaper.Actually, no.
Right now gas is about 8-10p/kWh, whereas night rate electricity is 8-19 p/kWh depending on the tariff.
When used in conjunction with heat pumps, the electricity delivers far more heat.
The point is, they should be running the night rate flat out, even if it means going well above 18C. The heat will leak away slightly faster at a higher temperature, but the cost of heating is a third of the day rate. Depending on the insulation they should set the night rate thermostat to 25C or higher, and even run fan heaters on the cheap rate to get the temperature up. Any electricity used on the day rate means they messed up.WTF
Hi.You could make your own doppler machine, various moving parts to stretch the frequency. But as you state this would be measuring radio waves rather than light directly.I don't know whether you have the capabilities, or more to the point whether it would work but you could try slowing light down.Yes we could, we could put the light in a dense medium. However, this affects the wavelength and speed only. The frequency of oscillations would be unchanged.
It's the frequency, or "the speed of oscillation" if you prefer, that makes it so hard to directly measure the oscillation in the E field. We don't seem to have a lot of equipment that can respond to such rapid fluctuations in the E field.
However we could try something similar. In fact, you've made a first class suggestion when I think about. We don't need to change the speed, we can just change the frequency.
Emit some visible light, then get in space rocket and move fast. The light should have a relativistic Doppler shift and then all we have to observe is the oscillation in the E field of some radio waves (which we can more or less do to everyones satisfaction, just stick a pole in the air to act as an radio antenna and directly measure an oscillating current flow).
Best Wishes.
The incompetence in those threads is high. One general idea is to use off-peak electricity to mostly warm up your house. The overnight cost of electricity is a third, so heat the main living areas well above the normal living temperature, and only run the heat pump during the day to stop it falling too much- using the house as a thermal battery. They're doing more like the opposite, heating the house to a lower temperature overnight and then trying to warm it up higher during the day on the expensive electricity! Madness!