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Joined 1 year ago
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Cake day: June 10th, 2023

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  • It is a pretty good article but I have some nitpicks:

    They say both that you cannot decide in a vacuum and fast fashion uses synth materials to make disposable clothing. I think given these two ideas, the carbon usage for one garment of wool vs one garment of nylon should include all the “waste” garments produced as well. Since, when you buy from a company that practices this, the impact is from the whole process, as they are keen to point out. That includes the sweatshop to landfill garments.

    Personally I like not wearing a microplastics generator.

    I am also curious about hemp clothing.







  • I do have to admit, after getting concussed I also appeared to freeze but I was thinking hard of what the right word is to say next.

    That said, probably anyone in concussion recovery should be on leave from legislating. The brain will heal more slowly, and your work will be of poor quality.

    That’s all before getting into the actual politics of having a gerentocracy.

    I know a lot of people have talked a out adding an age limit, but it seems to me most of the ancient ones are skating by on incumbent effect. If we had term limits it would resolve that. Alternatively something like the Virginia Gubernatorial rules where you cannot hold the position successively.



  • I am an engineer that has worked in the space industry my entire career, and here are my thoughts:

    GOES and METEOR weather satellites transmit images publicly that are NOT real time, but are downlinked, processed, and uplinked for public broadcast. This is pretty simple and saves a lot of processing power on the spacecraft side. That’s important because the biggest constraints on spacecraft processing are: power budget, radiation hardiness, and thermal.

    I was able to find an image of the actual satellite in assembly. From this we can guess that there is probably not more than a square meter of solar on-board, so we can give it a round 1300W of power. I couldn’t find any orbital parameters(If Gunter doesn’t have it, who does?), but given it’s main task is as an imager, we can assume LEO, and so this 1300W isn’t going to be constant since the spacecraft will most likely be eclipsed part of the time.

    Generous 1000W average solar flux, generous 25% panel efficiency, 250W/h.

    So lets look at rad hard processors. They have to be either shielded or run multiple and do voting, though even that isn’t fully acceptable as some SEU (single event upset) can cause permanent damage and leave you down a voting member. The latest and greatest RAD5545 advertises 5.6 giga-operations per second (GOPS) at 20 watts, so if we assume (artlessly, and likely incorrectly) a linear power usage, the 80 TOPS of the WJ-1A should need some 280kW. So we know they aren’t using a typical rad-hard CPU topology for their AI models. I see that Corel/Google advertise 2 TOPS per watt on their edge TPUs (Tensor Processing Unit).

    So assume a large ASIC (application specific integrated circuit) at the same efficiency of 2TOPS/W, with 4x multiples for voting and we get a far more reasonable 160W. Still a LOT of power on orbit for such a small spacecraft, but actually possible.

    So for thermal limits, do they run the TPU only on the dark side in place of their on-board heater? The have some white panels that might be radiators, but it’s hard to say.

    Hard to say from these fluff articles. I really want to hear:

    • What’s the efficiency on the TPU?
    • How did they make it rad-hard, and how long do they expect it to last?
    • What models do they run on the edge?
    • What is their downlink budget? Can they pull full imagery if they want it or are they limited to ML analysis only?

    I expect to see more ML in space, but to be honest I did not expect it to be in such a small form factor.