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Technology (Not Science)

LynahFan said:
Agree with all of this. Just a nit that I don’t think anyone is contemplating 200-seat cabins. The most ambitious player today is Boom, and they’re looking at 55 to 75 seat cabins. Their sweet spot is really the NYC/BOS to LHR/LGW market, where it really would be possible to fly over for a lunch meeting and then return to sleep in your own bed that night.
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You're right, and I knew that, but yeah. especially at under 100 passengers the cost on this would be astronomical.
 
Interesting.

European Union member states and lawmakers reached a preliminary agreement on what they touted as the world's first comprehensive AI legislation on Friday.

This landmark deal aims to regulate artificial intelligence (AI) technologies, including ChatGPT and governments' use of AI in biometric surveillance.

According to the European Parliament the new deal sets a global precedent as the world's first AI law, with the EU poised to be the first major region to implement such laws.
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< Flashes compunerd bat signal. > Hype or truly transformative?

"The good thing about graphene is, not only can you make things smaller and faster and with less heat dissipation, you're actually using properties of electrons that are not accessible in silicon. So this is really a paradigm shift — it's a different way of doing electronics," said de Heer.
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That sounds... important.

Here's Nature to make me feel (more) stupid:

Abstract

Semiconducting graphene plays an important part in graphene nanoelectronics because of the lack of an intrinsic bandgap in graphene[SUP]1[/SUP]. In the past two decades, attempts to modify the bandgap either by quantum confinement or by chemical functionalization failed to produce viable semiconducting graphene. Here we demonstrate that semiconducting epigraphene (SEG) on single-crystal silicon carbide substrates has a band gap of 0.6 eV and room temperature mobilities exceeding 5,000 cm[SUP]2[/SUP] V[SUP]−1[/SUP] s[SUP]−1[/SUP], which is 10 times larger than that of silicon and 20 times larger than that of the other two-dimensional semiconductors. It is well known that when silicon evaporates from silicon carbide crystal surfaces, the carbon-rich surface crystallizes to produce graphene multilayers[SUP]2[/SUP]. The first graphitic layer to form on the silicon-terminated face of SiC is an insulating epigraphene layer that is partially covalently bonded to the SiC surface[SUP]3[/SUP]. Spectroscopic measurements of this buffer layer[SUP]4[/SUP] demonstrated semiconducting signatures[SUP]4[/SUP], but the mobilities of this layer were limited because of disorder[SUP]5[/SUP]. Here we demonstrate a quasi-equilibrium annealing method that produces SEG (that is, a well-ordered buffer layer) on macroscopic atomically flat terraces. The SEG lattice is aligned with the SiC substrate. It is chemically, mechanically and thermally robust and can be patterned and seamlessly connected to semimetallic epigraphene using conventional semiconductor fabrication techniques. These essential properties make SEG suitable for nanoelectronics.
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Kepler said:
< Flashes compunerd bat signal. > Hype or truly transformative?



That sounds... important.

Here's Nature to make me feel (more) stupid:
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For now, I would still call it hype. Not that it isn't possible, there are a huge amount of areas where graphene has demonstrated that it is an incredibly capable thing- even the number of areas where it works is astounding.

The problem is that nobody has figured out how to mass produce it.
 
MichVandal said:
For now, I would still call it hype. Not that it isn't possible, there are a huge amount of areas where graphene has demonstrated that it is an incredibly capable thing- even the number of areas where it works is astounding.

The problem is that nobody has figured out how to mass produce it.
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I thought this paper was exactly that: the way to do that to make them act like semiconductors?
 
Kepler said:
< Flashes compunerd bat signal. > Hype or truly transformative?



That sounds... important.

Here's Nature to make me feel (more) stupid:
Click to expand...

I was working in 2014 with a Cornell alum Purdue professsor on the use of graphene in high-end aerospace batteries - its combination of electrical and thermal properties is darn near magical.

He’s still working on it….at UCLA now.
 
Um.

Here is the panel afterwards:

108534065.jpg


Any of our SMEs care to speculate given that rip pattern and the apparent splitting of the surface from that honeycomb interior? I assume it is not solid because of weight? Is this a shear?

The airline denies it was lost midair, and says it actually ripped off after landing. Could the vibration of the landing do that? It is (er, was) right next to the landing gear.
 
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Kepler said:
Um.

Here is the panel afterwards:

108534065.jpg


Any of our SMEs care to speculate given that rip pattern and the apparent splitting of the surface from that honeycomb interior? I assume it is not solid because of weight? Is this a shear?

The airline denies it was lost midair, and says it actually ripped off after landing. Could the vibration of the landing do that? It is (er, was) right next to the landing gear.
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Anything’s possible, but if it was lost after landing, they should be able to produce the panel as proof. If it started coming apart in mid air, then it sure seems like continuous wind blowing past at 400-500 mph would tend to cause it to unzip a lot more violently than the momentary structural load imparted by landing or driving over a bump. The worst tornadoes are only like 300 mph, and the forces go as the square of speed.

Nearly all composite panels are constructed like this, with carbon/kevlar/glass fibers sandwiching a plastic lightweight honeycomb core. Pound for pound, that’s much stiffer and stronger than a panel made from just fiber and resin. Usual there are multiple layers of fiber cloth, whose resins meld together during the curing process. By far the most common failure mode is “delamination” where those layers of fiber peel apart from each other (or peel away from the core). There’s certainly evidence of that here, but again, you would see that after failure in almost any loading condition, so it’s non-specific as to the root cause.
 
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