I once met a person that never drank water, only soft drinks. It’s not the unhealthiness of this that disturbed me, but the fact they did it without the requisite paperwork.

Unlike those disorganised people I have a formal waiver. I primarily drink steam and crushed glaciers.

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Cake day: June 14th, 2023

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  • As a general rule I hold suspicion to any marketing that claims that using CO2 (or other products of burning) is environmental friendly. The products you get from burning fuels are supposed to be useless and of low value, otherwise they are not burning them efficiently.

    To turn CO2 into potassium carbonate (pearl ash) you will need a lot of energy. Where they get this energy from is far more important than where they got the CO2 from. I would not be surprised if it is more environmentally friendly to make the pearl ash through a different process and ignore the CO2 rather than trying to convert the CO2 into pearl ash.

    Background chemistry

    Fuels are chemicals with a lot of potential chemical energy stored in them. They are generally considered (at a minimum) flammable or “reactive” in some way.

    When we burn fuels we turn them into products with very little potential chemical energy, mainly CO2. You cannot burn CO2 and get energy out of it, it is a “stable” or “unreactive” chemical. It has very little chemical energy stored in it compared to the original fuel.

    The difference in stored chemical energy between the fuel (eg methane CH4) and the products (eg CO2) is turned into heat and then electricity (via steam turbines). If your products are still reactive then you have not used them to their full potential and you will not get as much heat out as you could (not to mention improperly burned products tend to be toxic, eg carbon monoxide).

    Now let’s look at potassium carbonate (K2CO3). It’s a somewhat reactive chemical, it’s not anywhere as stable as CO2, you can observe this by the fact it readily wants to react with other chemicals (caveman test: put it on your skin and it will sting). CO2 is very stable and does not want to do much (caveman test: put it on your skin and you won’t feel it).

    To make K2CO3 from CO2 you will require energy input. Turning an unreactive chemical into a reactive one is a bit like the reverse of burning something. This energy will probably come from burning more coal or gas. I suspect it will require more coal/gas than making the CO2 did, so net overall you will probably be releasing more CO2 than you capture and turn into K2CO3.

    Of course if they’re using renewal energy (solar) for this step then this could be a net positive.

    My level of trust in the honesty of product packaging and marketing is pretty low and if they don’t mention it then they obviously don’t think it’s important. 🤷

    EDIT: I’ll also add that “carbon capture” projects (things that claim to get rid of or make use of the CO2 from burning fuels) are universally disasters or scams.

    EDIT2: I’ve taking some simplification liberties with the chemistry here. Technically CO2 isn’t completely stable, you can do stuff like make weak acids in water with it, but I do not believe anyone has found a way for that to usefully use up what we emit from burning fuels.


  • WaterWaiverto3D Printing@lemmy.mlWeird PrusaSlicer error
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    15 days ago

    All of the the surface normals are backwards. This means your shoe is inside-out; instead of being a solid shoe in a vacuum it’s a shoe-shaped-hole inside a solid universe.

    By default blender renders all polys as double-sided so you mostly don’t notice (other than some lighting oddities near corners). Turn on backface culling if you want to check if your normals are the right way around or not.

    I often end up with some of my polys backwards because of the way I extrude and join parts of my models. I distinctly remember a bug in Gmax (old free version of 3DSmax) where the mirror tool would create polygons with some special, broken property where their normals would be correct in the editor, but completely wrong when exported :( much time and hassle was lost to that.




  • I was going to reply with “you can’t use barbed fittings at high pressures”, but I looked it up and found some claiming 150psi (10 atmospheres). Huh. Perhaps this did start life as a hydraulic cylinder that has had some parts lopped off.

    Not sure what the tube is filled with, but it looks like a lot of corrosion.

    I don’t think it’s built up corrosion. The pipe is steel and corrodes to red/brown iron oxide, as visible around the circumference at the end. The green colour in the filling is not an iron oxide. It might be a copper oxide, or some dye in the white material.



  • Anything odd with temperatures or power draws perhaps? nv-top shows both for me (but I run an AMD GPU + non-proprietary drivers), otherwise lm-sensors might be good.

    nvtop seems to show normal usage

    Neither the GPU nor CPU utilisation change at the 30 min mark? If one is pegged at 100% then it’s probably hard to work out what is going on. Running a singleplayer game staring at a wall and configured with limited framrate might let you run both the CPU and GPU at less than 100%, perhaps making it easier to see if one or the other suddenly changes.


  • The rough (frit) glaze surface would be the opposite of what you want in a HV bushing, because they would wick and store conductive water.

    Interestingly it’s on the both the top and the bottom. Perhaps this high surface area makes it more compatible with some specific glues; allowing you to stack a pile of these pieces together to make a full bushing? That might also explain why there is not hole in the middle, this could be a compression style bushing stack for holding wires up in the air off a surface.



  • Have not seen this mentioned anywhere else so I’ll add: this is a “board edge connector”. A whole PCB will plug into this socket, rather than a plastic connector on the end of some wires.

    Picture plugging a graphics card into a socket on a motherboard. It’s that type of connector. The PCB it will plug into will have exposed metal pads on a bit that juts out.




  • Probably double-sided prototyping PCBs. The double-sided ones tend to be green (FR4 fiberglass resin), the single-sided orange (FR2 paper phenolic-resin).

    Terminology varies, a lot of greymarket sellers use “veroboard”, “prototype board” and “breadboard” interchangeably.

    The glue between the copper pads and the board itself tend to better with the double-sided boards, I agree with you OP :) Although this isn’t universal, I’ve had some nasty bare copper boards on FR4 where the pads pop off when you try to solder to them; and some old FR2 boards with really well adhered pads. I’ve read somewhere that this might (?) be due to moisture in the PCB boiling off when you put the soldering iron to a pad and that baking the board in an oven first can help, but I have not tried that. I suspect a lot of it comes down to the quality of adhesive used between copper and substrate.




  • There are no changes to the nbn wholesale pricing of these speed tiers arising from the speed increases.

    Interesting, but how will this affect the price for end users? There are other fees charged to the ISPs too?

    I am suspicious because NBNco only mentions wholesale pricing in this article, not end user pricing. They would have modelled it and then chosen not to talk about it. They might not technically be the entity finally billing you, but they’re responsible for strong and direct impacts on what users pay.


  • WaterWaivertoGaming@beehaw.orgLet's discuss: Uplifting Games
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    2 months ago

    It’s a gorgeous game experience. Not to mention they put so many other gamedevs to shame with their technical accomplishments (especially in the expansion – flooding waves in a ringworld!).

    Don’t look up spoilers. Get yourself a copy and play it. Find somewhere to land your spaceship :)