gene-h

8 ms·

31.
by gene-h 3y ago
NIF uses inefficient lasers because they were cheap to build at the time and because NIF is a science experiment. Lasers have gotten better. And lasers aren't the only way ICF fusion could be carried out, it may be possible to use ion
32.
by gene-h 3y ago
The work from Rochester mentioned briefly is probably the second best performing fusion experiment and this was done with a laser that's at least 29 years old. What the article doesn't mention is that the approach demonstrated cou
33.
by gene-h 3y ago
>There is some radiation with some designs, but the basic idea of fusing hydrogen into helium works without radioactivity. Per unit energy D-T fusion, the fusion reaction most likely to be viable near term, generates more neutrons than t
34.
by gene-h 3y ago
The power it can provide is much more reliable than power provided by solar panels on earth, so it's more economically valuable than power by solar panels on earth. It would provide power at night and if the right microwave transmit fr
35.
by gene-h 3y ago
Caltech's approach[0] is to make their satellite with solar panels on one side and a transmit antenna on the other, so pretty much the whole area of solar panels serves as a giant phased array transmit aperture. They claim that this ap
36.
Fluid Control Devices(miriam-english.org)
2 points by gene-h 3y ago|0 comments
37.
by gene-h 3y ago
Springs do not have to wear out. If springs are made from a material such as steel that has a fatigue limit and the stress they experience is less than the fatigue limit, they may be deformed forever. As for the answer, it appears to be yes
38.
by gene-h 3y ago
Really bright LEDs can be used for underwater optical communication up to 100 m[0]. I'd really like to see someone make this tech into an FPV system for RC subs. [0] https://optics.org/news/11/9/36
39.
by gene-h 3y ago
Powerlight technologies(formerly LaserMotive) has demonstrated power over fiber tech that can transmit hundreds of watts[0][1]. The intended application of this tech was for powering underwater remotely operated vehicles(ROV). The same amou
40.
by gene-h 3y ago
This is a much more exciting study than it originally seems. They appear to claim that an observed state of sodium at high pressure has bonds between core electrons. If you recall from your chemistry class, bonds were only known to occur be
41.
by gene-h 3y ago
The first 1TB microSD card was released in 2019[0]. It is disappointing that the time to double was about 4 years. [0] https://www.zdnet.com/article/micron-releases-worlds-first-1...
42.
by gene-h 3y ago
They used the Palomar observatory's Hale telescope to receive the signal. So it may be doable provided you have a 5.1 m aperture telescope at home
43.
by gene-h 3y ago
Sure.
44.
by gene-h 3y ago
RoboCo is a nice vehicle building game. https://roboco.co/ https://store.steampowered.com/app/1067220/RoboCo/ It has one of the best mechanism simulators I've seen in a game with all so
45.
by gene-h 3y ago
I am not referring to powder bed inkjet 3d printing, I am referring to making parts by inkjetting UV curable polymer. The 3D printer mentioned in the article, the cheap 3d printer previously made at MIT, and the phone case printer available
46.
by gene-h 3y ago
It is a shame that inkjet UV cure 3D printers haven't caught on with hobbyists. Inkjet 3D printers are awesome, the resolution is hard to beat, you can make parts with multiple materials as was shown in the article. Some can even print
47.
by gene-h 3y ago
More details in a poster here[0], a video presentation[1], and a paper[2]. The basic idea is to more efficiently use fission energy. When atoms split in fission, they fly apart VERY FAST. If these could be directed out, fission energy could
48.
by gene-h 3y ago
Electroadhesion could be used to hold objects on belts. Here on earth electroadhesive conveyors are sold as a way to move objects up steeper angles[0] [0] https://www.youtube.com/watch?v=zJu9hzZA-p0
49.
by gene-h 3y ago
I wouldn't be so worried about LLMs making guns. The SketchIT project found that it's very difficult to describe mechanical device to other humans using just text, images are needed too[0]. I'd also worry about the gun produc
50.
by gene-h 3y ago
I think the TL;DR is foxconn wants to assemble data center/a bunch of servers with Nvidia's chips which they call AI factories, but the marketing BS is strong.
51.
by gene-h 3y ago
It's not clear that this offers any advantage for how complex it is. The claimed advantage is being able to trade off speed for efficiency, but curves of both are fairly flat. For mud, at max efficiency it can travel at 25 mm/s an
52.
by gene-h 3y ago
This study[0] claims that is not viable as it would require 9% of forecast renewable production in 2050. Less net carbon emission can be produced if the electricity is used instead to displace coal plants and the plane run on conventional k
53.
by gene-h 3y ago
Why wouldn't operators of algorithms that produce novel inventions attempt to patent their output or even automate the process so that the patenting occurs with little to no human intervention? I'd argue we aren't very far fr
54.
by gene-h 3y ago
NIF was never made to generate power. NIF uses lasers which are less efficient, but were cheaper to build. We have better lasers. What is important about NIF's result is that they demonstrated 'burning' plasma. The yield migh
55.
by gene-h 3y ago
This study claims that it is unrealistic to have net-zero air travel fueled by hydrocarbons by 2050[0]. If the fuel is made from biomass, then increase in land use alone would nullify any benefits. If the fuel is made from renewable electri
56.
by gene-h 3y ago
The short of it is stereovision using hyperspectral thermal cameras, but the long answer is a bit more interesting. The problem with doing stereoimaging with thermal radiation is that almost all objects are glowing due to radiation emission
57.
by gene-h 3y ago
The space of possible combinations of just three different elements of the periodic table is huge. This is before you get into added dimensions of processing, ratios of each element to the others, different possible crystal structures, etc.
58.
by gene-h 3y ago
As far as I can tell the critical field, the maximum magnetic field it can withstand before turning into a regular conductor, is relatively low at 0.3 Tesla. In superconductors like YBCO, it's often more than 100 T. If critical field c
59.
by gene-h 3y ago
This isn't too different from how conventional high temperature superconductors are made.[0] A converted pottery kiln can be used to make them [0] https://www.greenoptimistic.com/make-superconductor-home/
60.
by gene-h 3y ago
Space suits are actually made from teflon coated glass fibers[0]. It's one reason why space suits are distinctively white and used because it's fire resistant. [0] https://en.wikipedia.org/wiki/Beta_cloth

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