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The "Crown of Nobles" Noble Gas Tube Display (2024)
21–30 of 38 posts
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#22If you're into gas displays, there's also the plasma toroid (not globe). People have be filling it with different gasses to get different colors. https://www.youtube.com/watch?v=iXqbCmTt1Yg https://www.aliexpress.com/item/1005007446864488.html
I wonder how this one works: https://youtube.com/watch?v=xlcywgEMuGI
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#23It’s nice to see this guy getting some attention for a different reason. Maybe something good will come out of this whole debacle.
It took some digging to figure out what the debacle was. Is this it? https://vuink.com/post/penool-enguoha-d-dtvguho-d-dvb/mjrath...
Also the top story on HN right now: https://news.ycombinator.com/item?id=46990729
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#24If you're into gas displays, there's also the plasma toroid (not globe). People have be filling it with different gasses to get different colors. https://www.youtube.com/watch?v=iXqbCmTt1Yg https://www.aliexpress.com/item/1005007446864488.html
A few safety PSAs on these: 1. This puts out a fair amount of UVC light. Most people are not familiar with this hazard because the atmosphere filters it, but even a modest flux can degrade your eye lenses and give you cataracts. Get a set of safety glasses that explicitly say they block UVC if playing with this for more than a minute or two cumulative. Normally you would use borosilicate glass to filter it, but I wou…
Seems too inexpensive to be made of quartz to transmit the UVC. Typical glass will absorb it, possibly fluorescing a bit in the visible.
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#25Earlier quoted context omitted.
A few safety PSAs on these: 1. This puts out a fair amount of UVC light. Most people are not familiar with this hazard because the atmosphere filters it, but even a modest flux can degrade your eye lenses and give you cataracts. Get a set of safety glasses that explicitly say they block UVC if playing with this for more than a minute or two cumulative. Normally you would use borosilicate glass to filter it, but I wou…
Unless its quartz glass or something wouldn't it be blocking pretty much all of the UVC?
Yes I'd wager they're soda lime and ought to filter it. In absence of knowing the material, it's a hazard that can be mitigated with cheap PPE. Everyone can make their own choice, as long as it's informed.
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#26If you're into gas displays, there's also the plasma toroid (not globe). People have be filling it with different gasses to get different colors. https://www.youtube.com/watch?v=iXqbCmTt1Yg https://www.aliexpress.com/item/1005007446864488.html
I wonder how this one works: https://youtube.com/watch?v=xlcywgEMuGI
Those looks like LED strips inside of frosted tubes. The connectors on the bottom are similar to 3 prong connectors used in LED strips.
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#27I purchased one of the Lumora gas displays and it works well. Simple enough to build yourself (laser cut, 3d print) if you have the gas filled tubes. Fun to have my kids guess what color a gas will glow.
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#28Earlier quoted context omitted.
It took some digging to figure out what the debacle was. Is this it? https://vuink.com/post/penool-enguoha-d-dtvguho-d-dvb/mjrath...
Also the top story on HN right now: https://news.ycombinator.com/item?id=46990729
Posted half an hour after my comment. That is oddly specific timing.
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#29> [xenon is] great for in-space propulsion because it’s fairly heavy (so you get more ooomph per atom) More specifically, for a given exhaust velocity and grid spacing, the space charge limited thrust density (thrust/area) of an ion engine scales as the square of the mass/charge ratio of the ions. So you really want heavy singly charged ions. This is completely unlike thermal rockets, where you want low molecular wei…
BepiColombo [0] uses 581 kg of Xe gas for its electric propulsion. I remember reading at the time this was being built that it consumed a measurable portion of the global xenon production for that year. This post reminded me to look that up, and it seems to be only ~1% of the ~50 tons, which is quite a bit less than I remember but still quite significant for a single application to use a non-trivial amount of the supply.
[0]https://sci.esa.int/web/bepicolombo/-/60642-bepicolombo-mtm-...
Re: The "Crown of Nobles" Noble Gas Tube Display (2024)
#30> [xenon is] great for in-space propulsion because it’s fairly heavy (so you get more ooomph per atom) More specifically, for a given exhaust velocity and grid spacing, the space charge limited thrust density (thrust/area) of an ion engine scales as the square of the mass/charge ratio of the ions. So you really want heavy singly charged ions. This is completely unlike thermal rockets, where you want low molecular wei…
BepiColombo [0] uses 581 kg of Xe gas for its electric propulsion. I remember reading at the time this was being built that it consumed a measurable portion of the global xenon production for that year. This post reminded me to look that up, and it seems to be only ~1% of the ~50 tons, which is quite a bit less than I remember but still quite significant for a single application to use a non-trivial amount of the sup…
Given that ~100 million tons of oxygen are produced annually, extracting all the xenon from that air would yield about 170 tons/year. So there's a bit of room for growth.
The BepiColombo number is similar, I think, to the amount of xenon made annually in nuclear reactors (where it occurs in spent fuel as the result of fission.)