Readit Newsjnovacho commented on A startup’s quest to store electricity in the ocean techcrunch.com/2025/10/22... · Posted by u/rbanffy
How exactly are they pushing the brine against the ~50BAR pressure differential?
How does this differ from Rufus [0] or Balena Etcher [1]?
[0] https://rufus.ie/en/
[1] https://etcher.balena.io/
From the Introduction: "Each satellite may carry traffic for dozens of independent networks through an array of on-board transponders, each covering a diameter of thousands of kilometers (at most a third of Earth’s surface)".
Can someone help me understand the use of "diameter" in this sentence. I am guessing it refers to the satellite's signal coverage of the Earth's surface. If that's the case, wouldn't something like arc degrees be a better measure? I just can't figure out how "diameter" can be used to describe a coverage arc or area.
They mean the intersection between the cone produced by the satellite and "illuminated" surface. If the antenna beam is normal to the sphere, it will produce a disk which has an diameter.
jnovacho commented on I ditched Docker for Podman codesmash.dev/why-i-ditch... · Posted by u/codesmash
> Privileged ports in rootless mode not working? Good! That's security working as intended. A reverse proxy setup is a better architecture anyway.
So, how are you supposed to run the proxy inside the container? Traefik for example? Genuinely curious.
Hi @danybittel, could you explain a bit more about the polarization filter you used to filter our the content and only let through the obstacles?
I am interested to know how it works.
Thanks.
Virtually any LCD screen will produce polarized light. This is the core working principle of those screens. So if you use a polarized filter (sunglasses for example) it will completly block the image coming from the screen.
You can see the effect here: https://www.reddit.com/r/mildlyinteresting/comments/crvpil/t...
I believe this will not work with OLED screens though, but I do not have one to test this.
jnovacho commented on Navy demonstrates multi-day solar UAS flight navair.navy.mil/news/Navy... · Posted by u/bookofjoe
This was envisioned by the movie Interstellar where the opening scene shows them chasing an old autonomous Indian Air Force drone that had been flying for years, ostensibly after that agency ceased to exist. I'm sure it's been in other media as well but that's what comes to mind here.
Anyway, it should be interesting to see where this goes in the future.
This was the central theme of https://www.youtube.com/watch?v=IjJmTeBSEzU
jnovacho commented on Show HN: I made a tool to generate photomosaics with your pictures pictiler.com... · Posted by u/jakemanger
How exactly does this work? The example I chose is a mosaic of photos, over which is overlayed the original image with alpha set to 50%.
So it does not use the submitted photos as tiles, right?
jnovacho commented on I hacked my washing machine nexy.blog/2025/07/27/how-... · Posted by u/JadedBlueEyes
I know nothing about US 240V power circuits — what plugs do you use, could you get by with a Euro system?
I use Eve Energy smart plugs, which seems to be supported in Home Assistant through the matter integration. Local first, no bullshit remote account requirements, good quality, around 40€ / USD 45.
I believe that US 240V is 2 hots, neutral, and ground.
EU 240V is one hot, one neutral and ground.
EU 400V (380V) is 3 hots, neutral and ground.
None of this is cross-compatible.
I don't think the Journalist who wrote the article understood the technical details, but from digging a little at their website I think what's going on is they're moving heavy brine up and down, all of it equalized with local pressure.
Despite them describing it as pumped hydro, I think its better framed as a cousin of the "chunk of concrete suspended over a mine shaft" style gravity battery. Replace the mineshaft with water and the concrete with salt.
So if there is any leak in the system, it will kill local wildlife right, like the brine pools under ice in Antarctica.