--- Log opened Wed May 06 00:00:14 2020
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05:57 < kanzure> lnd "operational safety guide" https://github.com/lightningnetwork/lnd/blob/master/docs/safety.md
05:57 < kanzure> https://bitcoinops.org/en/newsletters/2020/05/06/
05:58 < fenn> .tw http://twitter.com/MIT_CSAIL/status/1258012073172271104
05:58 < saxo> @Grimezsz We are excited to announce that, effective today, we have changed the name of our lab to the MIT Computer Science and Æ Laboratory, or MIT CSÆL.🧝🏽‍♀️ (@MIT_CSAIL, in reply to tw:1257836061520101377)
05:59 < fenn> i, for one, welcome our elven overlords
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06:41 < nsh> .t https://twitter.com/LDNBitcoinDevs/status/1258006224005738498
06:41 < saxo> On Tuesday 26th May we will host a presentation by @KLoaec and @darosior on their Bitcoin vault design "Revault". We will host a Socratic Seminar the week before on Bitcoin vaults and @JeremyRubin's CheckTemplateVerify (CTV). https://www.meetup.com/London-Bitcoin-Devs/events/270480249/ (@LDNBitcoinDevs)
06:41 < nsh> cc kanzure
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08:49 < fenn> .tw http://twitter.com/krnsrksn/status/1254817085420711936
08:49 < saxo> Our paper about glowing plants is out in Nature Biotechnology today — but first, watch this: // 1/5 https://video.twimg.com/ext_tw_video/1254814935932166144/pu/pl/paFDqMhFI0Wq0eND.m3u8?tag=10 (@krnsrksn)
08:53 < fenn> supposedly visible to the naked eye and/or smartphone camera
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12:28 < L29Ah> what do you ppl think of aluminum linked to the alzheimer's disease?
12:37 < Llamamoe> I think that there's a fuckton of factors linked to Alzheimer's Disease and brushing up on the topic is beyond the amount of effort I'm willing to put into it
12:37 < Llamamoe> And the fact that you really don't want high aluminum levels in your bloodstream is obvious regardless
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12:42 < L29Ah> it's not obvious since aluminum antacids are widespread and give you a gram of aluminum per dose
12:42 < L29Ah> and apparently 0.5% make it into the bloodstream
12:43  * L29Ah reads https://pdfs.semanticscholar.org/e986/d90f0d8331895c16e477a4d48e0cb48ad047.pdf but the author's credentials are kinda worrying
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12:59  * adlai sighs
13:00  * Llamamoe pat adlai to remedy sighs
13:00 < adlai> for the benefit of people, if there are any such outside of my fertile, wild, imagination, who don't want to watch your fucking ext_tw_video, that is almost certainly a video about the crap burning up in the atmosphere tonight.
13:01 < adlai> they are named in honor of some dead guy, who probably didn't get burned up due to the prohibitive cost of launching his corpse to the necessary altitude.
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15:25 < L29Ah> what
15:25 < L29Ah> oh
15:25  * L29Ah just ignores video links
15:35 < jrayhawk> Tau and amyloid production are both insulin-dependent. Essentially anything that increases oxidative stress or inflammation will be "linked" to alzheimers.
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19:47 < fenn> adlai did you even read the bit about "glowing plants" in the description?
19:48 < fenn> it's a system for reporting arbitrary biochemical status in eukaryotes, and it also looks cool, and maybe you can buy a pet plant that glows in the dark
20:08 < kanzure> is it ultraviolet fluorescence only?
20:22 < lsneff> .title https://arstechnica.com/science/2020/05/microwave-thruster-makes-for-clean-burning-jet/
20:22 < saxo> Microwave thruster makes for clean-burning jet | Ars Technica
20:23 < lsneff> Looks like every scifi novel was right at once.
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22:40 < fenn> no it's emitting light
22:44 < fenn> lsneff this microwave plasma thruster makes no sense. it's just heating the air. why would that be more efficient that not heating it?
22:45 < lsneff> Maybe it's better at heating a specific spot?
22:45 < fenn> explain
22:46 < fenn> than*
22:47 < fenn> i mean it's cool that it has no moving parts, but i don't get why they would even think it's more efficient than a turbofan
22:47 < fenn> that just has to be a measurement error
22:48 < fenn> it's not even a convergent/divergent rocket nozzle, just a straight tube
22:48 < fenn> maybe plasma requires a different shape of thrust section but certainly a straight tube is not the best
22:50 < lsneff> Yeah, I don't know man
22:51 < lsneff> There are some very efficient superconducting magnatrons
22:51 < fenn> ideally the air coming out of the back of your jet engine is as cool as possible
22:52 < lsneff> Why's that?
22:52 < lsneff> So it doesn't oxidize the airframe?
22:53 < fenn> because thrust is a consequence of momentum. heat is momentum going in directions that you don't want
22:53 < lsneff> Oh, that's true
22:54 < lsneff> So, you'd want a long superconducting focusing tube that let's the plasma cool?
22:54 < fenn> if they're just heating the air, a simple resistor or electrical arc should do just as well
22:54 < fenn> i just really don't understand the point of the experiment
22:54 < lsneff> Arcjets are a thing, but I don't think anyone has figured out how to makr them viable for in atmo
22:55 < fenn> do the electrodes degrade?
22:55 < lsneff> Yes
22:55 < lsneff> Very badly
22:55 < fenn> doesn't seem that hard to remove the oxygen from the input stream
22:55 < lsneff> You have to use big chunks of graphite
22:55 < lsneff> How would you even do that?
22:56 < fenn> pressure swing adsorber (zeolite)
22:56 < fenn> there's probably some cute continuous process
22:57 < lsneff> That seems unnecessary, but maybe it's something people haven't thought about
22:57 < fenn> it does seem unnecessary
22:57 < fenn> a resistor embedded in some high temp ceramic should last forever
22:58 < lsneff> Yeah
22:58 < fenn> there are so many wacky high temperature alloys i can't keep track of them
22:58 < lsneff> The problem with that is the speed of the air over the resistor changes the thrust
22:58 < lsneff> At zero velocity, there'd be no thrust
22:59 < fenn> same with the microwave plasma thruster
22:59 < fenn> this is common to heat engines of all sorts. you have to compress the fluid before heating it in order to extract energy from the heating
22:59 < lsneff> Maybe it's possible to form some weird waveform that creates different pressures at different points along the thruster?
23:00 < lsneff> So you don't need initial compression?
23:00 < fenn> pulsejets are a thing
23:01 < lsneff> Yes
23:02 < lsneff> If we ever get power satellites, high-thrust electric propulsion will be very useful
23:02 < lsneff> Beaming electricity down to anything that needs it would be awesome
23:02 < adlai> fenn: "I've stopped reading, it's too unreliable"
23:03 < fenn> adlai: why are there quotes around your last line?
23:03 < adlai> those plants do sound cool, though! can they make an Aubrey-II-shaped one?
23:05 < adlai> because it's a quote from a collection of jokes about Go
23:07 < fenn> lsneff just use ground based dishes or phased arrays
23:08 < fenn> there are already short range electric airplanes using batteries
23:08 < fenn> and it's not that short really, a hundred km or something like that
23:09 < fenn> 500 miles?
23:18 < lsneff> There are some vtol airtaxi prototypes that can reach about 100 km I think
23:19 < lsneff> If they're autonomous and cheaper than owning a car, they'll completely change how cities work
23:22 < fenn> noisy
23:22 < fenn> you'll end up having to travel over roads because of liability if it crashes
23:23 < fenn> airmule looks cool
23:23 < fenn> they're actually flying a drone taxi in dubai already
23:24 < lsneff> There was a paper about a 3d printed metamaterial that blocks sound without blocking airflow a few months back
23:27 < lsneff> Helicopters aren't required to travel over roads
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--- Log closed Thu May 07 00:00:14 2020