OneDonOne

6 ms·

1.
by OneDonOne 2mo ago
Again, Smaller radiator = bigger heat pump + more batteries and solar panels Satellites have a mass and power budgets. Your scheme only looks at temperature. If you want to build infinitely large AI Data satellites, go ahead.
2.
by OneDonOne 2mo ago
See: SNAP-10A BES-5 (oops, sorry 'bout that Canada!) TOPAZ-I Kiwi, Phoebus, and NRX (Mars here we come!) RD-0410 (Dossvidanya Solar System!) SP-100 TOPAZ-II Kilopower
3.
by OneDonOne 2mo ago
The Caltech Concept is just that — a concept. No prototype, no tests, no manufacturing, no results. When they achieve this order of magnitude improvement on a prototype scale, that's when we should take them seriously.
4.
by OneDonOne 2mo ago
It just goes to show magical thinking isn't just an American thing.
5.
by OneDonOne 2mo ago
Ah yes. The heat pump. My response: Carnot's theorem and refridgeration cycles rear their head. Your heat pump still needs power to pump heat uphill., negating any savings from a smaller radiator. And what happens when you shrink a rad
6.
by OneDonOne 2mo ago
> Ok, there are at least two bad assumptions there. > First, it assumes the radiator is at the same temperature as the GPU. But radiators become dramatically more effective as temperature increases, with radiated power increasing as t
7.
by OneDonOne 2mo ago
This reminds me of the railgun. Basic math and physics tells us that not only would the (very expensive) barrels wear out very quickly, but that it would have had to be fitted on on a nuclear-powered pocket battlecruiser. Worse, the technol
8.
by OneDonOne 2mo ago
If the "physics" tells you that your satellite cannot radiate heat away from your nVidia GPU cluster because each H100 needs 1.1 meter square of radiator, then opinions do not matter. The same applies to power supply and bandwidth
9.
by OneDonOne 2mo ago
This borders on science fiction. 88,000-and 1-million satellite clusters (as claimed in your link) are hard to take seriously, especially with the possibility of Kessler Syndrome. Also: 1. How do you cool your chips? Vacuum is a thermal ins
10.
by OneDonOne 2mo ago
Yes indeed, you are correct. My mistake.
11.
by OneDonOne 2mo ago
The ball is not microscopic, but the tolerances required to make the ball spherical and fit into the socket are.
12.
by OneDonOne 2mo ago
They do. The micro-precision subculture required to (in order): 1. Powder prep your tungsten carbide 2. Form said powder 3. Thermally prepare the resulting slurry using a vacuum forming furnace 4. Finish it with diamond lap grinders, lappin
13.
by OneDonOne 3mo ago
It is not the pen, it is the pen tip . Ballpoint pen tips are microscopic tungsten carbide ball held inside ultra-thin steel sockets. So you need cutting tolerances precise to 0.001 millimeters. If the socket is a fraction of a micron too
14.
Sandy Petersen on how Quake ruined id Software(xcancel.com)
4 points by OneDonOne 3mo ago|0 comments
15.
by OneDonOne 5mo ago
How does that change the fact that solar panels cannot be manufactured without high quality coal? (0) And doesn't that undermine the "cement for nuclear power" argument? (0) https://www.researchgate.net/public
16.
by OneDonOne 5mo ago
By that logic solar power should also be banned, due to the amount of coal required per panel (0) both for reduction and Czochralski process. And remember, solar panel factories don't run on solar power. (0) https://co2coali
17.
by OneDonOne 5mo ago
The LCOE may be triple, but the LFSCOE [0] (full system cost, not just cost of generation) however of solar, is triple that of nuclear in Texas, and 15x that in Germany. Notice that 1. Solar Irradiance per location is actually taken into co
18.
by OneDonOne 5mo ago
Stupid question from a foreign newbie. What separates a code monkey from a domain expert? Can you use infosec and embedded systems as two examples please?
19.
by OneDonOne 6mo ago
I see Germany now has the third highest price for industrial electricity in Europe. Why is that then?
20.
by OneDonOne 6mo ago
Has Germant's Energewiende helped with solving this energy issue?
21.
by OneDonOne 6mo ago
An excellent source for this architecture is Mitch Alsup and his Usenet posts going back to the late 1980s (he still posted regularly in the 2020s.)
22.
by OneDonOne 6mo ago
Not only are electric trucks are unprofitable, it means you switch your dependency from Middle-Eastern fossil fuels to Chinese rare earths. At least we can make biofuels from sugarcane
23.
by OneDonOne 6mo ago
The overbuilding that is required for stable electricity from the sun or wind makes that a non-starter. It is no wonder that when Germany tried this, they deindustrializrd, with some of the world's highest electricity prices. That shou
24.
by OneDonOne 6mo ago
Solar power is not infinite. Abd as long as you are using the same amount of energy/power to obtain the energy you wsnt to use, the pyshical limits of the size of the solar plant, time it takes to produce said energy, and other factors
25.
by OneDonOne 6mo ago
> Even during WWII Germany had to synthesize much of its hydrocarbon fuel. Germany [0], as well as Apartheid South Africa (SASOL), and now China, synthesized that fuel from coal. Which is itself a fossil fuel. [0] https://warh
26.
by OneDonOne 6mo ago
Good for the Chinese. The rest of us do not have the upfront capital to purchase these trucks. And there is still the matter of fertilizer, concrete, bulk chemicals etc. And solar panels. There is a very good reason why solar psnel factorie
27.
by OneDonOne 6mo ago
One of those dependencies w.r.t large solar panel buildouts, will be charcoal. [0] And lots of it. [0] https://www.researchgate.net/publication/335083312_Why_do_we...
28.
by OneDonOne 6mo ago
By feedstock, I mean the hydrocarbons that are required for the bulk chemicals, fertilizers, plastics, rubbers, detergents, pharmaceuticals etc. that we take for granted. And you still need trucks for last mile haulage.
29.
by OneDonOne 6mo ago
Modern civilization requires semiconductors, concrete, asphalt, fertilizer, and plastics to function. Never mind aviation and marine fuel to function. All of these require hydrocarbons. As long as that is the case, renewable power will cont
30.
by OneDonOne 6mo ago
And how will renewables like solar and wind wirk with Class 8 trucks, shipping, aviation or process heat or as feedstock? How have they worked in Germany, which has shut down her nuclear plants and Russian hydrocarbons? Please - tell us.

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