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Cake day: June 15th, 2023

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  • megopie@lemmy.blahaj.zonetopics@lemmy.world•Hong Kong housing complex.
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    4 months ago

    I mean, NYC has a fairly healthy level of pedestrian traffic in most areas. Times Square is mostly just full of tourists. I’m not as familiar with Tokyo but my understanding is a a lot of the more dense areas have a sort of 2/3 level layout of commercial, but there is level interconnects or they’re set up in conjunction with transit. So like, there are fairly large underground commercial strips at subway level, or sky bridges between blocks for 2nd story commercial.




  • megopie@lemmy.blahaj.zonetopics@lemmy.world•Hong Kong housing complex.
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    4 months ago

    I don’t think that the first level would be enough TBH. Like; it would probably have to be 2 or 3 stories of commercial to serve just the bare minimum needs of that volume of people, and now half your commercial is off street level, complicating pathing from public transit.

    Also, it’s tennis, what I assume is racket ball, a swimming pool and a couple basket ball court, so I think it’s actually a pretty good variety of activities, but still, not enough space for the volume of people, if all the blocks around it were the same density and had different varieties of activity, there still just wouldn’t be enough recreational space for the volume of people, even if the variety was absurd between them all.

    Like, maybe the density is warranted somewhere like hongkong where the government is largely funded by land sales, so maximizing the density is important for making the land sale valuable enough to fund social services, but like, there’s just not enough visible recreation and comercial, maybe they’ve got a strip underground by a subway station or something. I’d be curious how they make this work.


  • megopie@lemmy.blahaj.zonetopics@lemmy.world•Hong Kong housing complex.
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    4 months ago

    Not gonna lie, I don’t think that’s enough recreation space for the number of units there.

    And I don’t see any commercial space at all. That’s got to be enough units for several thousand people. Like, think about how much store space would be needed to make sure they could get all their groceries.




  • megopie@lemmy.blahaj.zonetoScience Memes@mander.xyz•🐙 Octopus is Octopus 🐙
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    6 months ago

    Octopodes, pronounced oc-top-o-dees, not oc-to-po-des. Like Hercules.

    Also, using the I ending to pluralize us endings comes out of an attempted prescriptive reform of English in the late 1800s to make it more like Latin. We still use es endings to pluralize us singulars most of the time, the places where we use I are ether direct usages of Latin words or remnants of that prescriptive push.



  • molten salt systems can be fail safe by having the coolant drain from parts of the system that can’t operate with solidified salt in them, even if they do, you can sends someone with a heating element to remelt the system at critical points before turning it on. It’s not like water where the coolant will physically expand and burst things when it freezes, water’s actually pretty weird in that regard, most things take up less volume when they freeze.

    I don’t know why they couldn’t do the same for an alpha class, but I suspect it’s because running the reactor without coolant in it would have caused a melt down, and if any coolant was left inside it when turned off, the control rods would have been frozen in place preventing it from being restarted. Perhaps in such a tightly sealed system, the shrinkage caused by cooling could have caused things to break as well.


  • Various common steels with a bunch of insulation around it usually, sometimes with a thin coating. The potassium/sodium/calcium nitrate mixes that are used with concentrated solar systems operating in range between 200 C and 600 C. So like, yah you don’t want to touch it, but it’s not gonna do much to steel. It can be somewhat corrosive, but, this is fairly easily mitigated by design.

    Molten salt for heat transfer and thermal storage is a pretty mature technology that goes way back before we started using it in concentrated solar systems.




  • I really like the concentrated solar systems that use molten salt, where rather than heating water directly, molten salt is heated and stored In large insulated tanks and tapped off to a heat exchanger to run the turbines, thus allowing power generation to match demand and continue at a constant rate even when light level very (such as at night).

    One interesting idea is to use a concentrated solar system to run an Einstein–Szilard refrigerator, or some other absorption refrigerator cycle.


  • Solar thermal has some distinct advantages when you start talking about really big instillations. Especially when considering power storage, molten salt systems can store heat and allow the generators to keep working even at night. Much cheaper than batteries at very large scales.

    Thermal solar systems are generally very efficient when the goal is heating something, not just generating power. So say, you want to run an ammonia plant without burning natural gas, or if you want to melt down metals for recycling. There are so many industrial applications where it’s a better way of doing it than using an electric heating element.


  • Yes, super critical CO2 turbines can work in such a system. As can sterling engines. Or thermoelectric solid state couples.

    Any system that uses a temperature differential to generate power can be used. It’s just a matter of what you care about in a given situation. Upfront cost, mechanical reliability, noise/vibration, and availability of needed components play in to what makes the most sense.