--- Log opened Wed Jun 14 00:00:23 2023
--- Day changed Wed Jun 14 2023
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10:50 < docl> I wonder if aerographite and aerographene are two different things, or just different words for the same thing? this article indicates the latter: https://www.nature.com/articles/ncomms14982
10:51 < docl> however, there are two different wikipedia pages, and the aerographene page claims 120 g/m^3 instead of 180 g/m^3
10:52 < docl> likely there's a connotative distinction, with aerographene being the term adopted later and thus including more innovation in the production process
10:56 < muurkha> I think you're right
10:56 < muurkha> 180 is pretty fluffy!
10:56 < muurkha> if the pores are full of air, does it burn?
10:57 < docl> since it's fairly compressible, using it for vacuum balloons isn't immediately obviously possible. it occurs to me that a centrifugal design might be better, where the balloon rotates fast enough to self-evacuate. this doesn't need to be the whole structure, could be multilayer. a disc shape might be best
10:57 < muurkha> it occurs to me that combustible gases in air have not just an upper explosive limit but also a lower explosive limit
10:58 < muurkha> that does seem like it would work if you have enough power to overcome the viscous drag
10:58 < docl> seems like it would burn. unless you flood with helium. actually it shouldn't be particularly flammable if flooded with hydrogen
10:58 < muurkha> well, I mean 180 might be below the lower explosive limit for carbon
10:58 < docl> er, the surface would be, but not the interior without oxygen present
10:59 < muurkha> where the heat from oxidizing one parcel of the structure isn't enough to raise the temperature of the air in the adjoining parcels to the ignition point
11:00 < docl> oh, good point. combustible but not explosive maybe? flooding with hydrogen would undo that. you could flood with nitrogen maybe, and use heat or centrifugal force to rarify it
11:01 < muurkha> not even combustible in the normal sense
11:01 < muurkha> because if that's the case it wouldn't be able to sustain combustion
11:02 < docl> ahh. heat wouldn't stick around long enough to fuel the reaction continuously
11:02 < muurkha> it's an easy computation, divide the enthalpy of formation of CO₂ multiplied by the oxygen content of air by the specific heat of air, isn't that how you get the adiabatic flame temperature?
11:04 < docl> well, in the presence of a superinsulator you can get flames that drill inward. polyurethane foam insulation is a fire hazard in the presence of metal e.g.
11:05 < muurkha> I mean I guess the reaction rate is presumably nonzero even at room temperature, right?
11:05 < docl> you'd have an excess of oxygen in this material if flooded with air, I'm thinking
11:05 < muurkha> so you would expect aerographene in air to gradually convert into CO₂
11:05 < muurkha> but possibly not fast enough to care about
11:06 < docl> hmm, I wonder if that's the case? sp2 hybridized so it should match graphene or graphite
11:07 < muurkha> I mean, I'm pretty sure the graphite-oxygen-CO₂ equilibrium also favors 400ppm CO₂ over graphite and 20% oxygen
11:07 < docl> in a high UV / cosmic ray environment it's going to degrade though I'm thinking. since the energy wells are finite
11:07 < muurkha> it's just that it only happens at the surface of the graphite and so at ordinary temperatures it's not fast enough to care about
11:09 < docl> hmm. as this degrades and the co2 gets replaced by air, it gets lighter (unevacuated scenario) but you'll lose structural integrity due to the holes created
11:11 < docl> well, it's CO. maybe that reaction tends to reverse at some rate so there's an equilibrium. also maybe you can induse healing by flooding with more CO
11:11 < docl> *induce
11:15 < docl> scalable lighter than air platforms are a game change, perhaps world changer. you could have cities that cycle their parking location between e.g. Tokyo and New York every few weeks.
11:16 < docl> also lets you do permashade anywhere, permitting e.g. glaciers in the sahara (with windbreaks to limit the flow of warm air)
11:23 < docl> wrt viscous drag, I wonder if you can do a matrioska set of spinning structures one inside the other. innermost would be fastest, and each encounters only air drag against the one immediately outside it
11:24 < muurkha> I don't think you'll have holes
11:27 < muurkha> the matrioshka approach might work to prevent turbulence
11:27 < muurkha> but you might need an infeasible number of layers
11:30 < docl> perhaps the number of layers is lower at high altitude/low pressure? kind of sucks if it can't work near the ground, but you could still build stratospheric infrastructure
12:39 < kanzure> https://www.theguardian.com/science/2023/jun/14/synthetic-human-embryos-created-in-groundbreaking-advance
12:49 < alethkit> Oh, it's finally happening!
12:49 < alethkit> How's the ectogenesis coming along?
12:58 < kanzure> dunno, i think people shoud focus on using uterus personally
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13:14 < TMA> technologizing uteri worked well for Bene Tleilax (a piece of fictional evidence in support of kanzure)
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17:41 < hprmbridge> kanzure> "Vitrification and nanowarming enable long-term organ cryopreservation and life-sustaining kidney transplantation in a rat model" https://www.nature.com/articles/s41467-023-38824-8
17:43 < hprmbridge> kanzure> RNA programmable nucleases https://www.biorxiv.org/content/10.1101/2023.06.13.544871v1
17:50 < hprmbridge> kanzure> shulman podcast https://twitter.com/dwarkesh_sp/status/1669006870022062080
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18:04 < hprmbridge> Eli> Is it me or is antagonistic pleitropy kind of horsecrap?
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18:06 < hprmbridge> Eli> Women need breasts to feed their children, but breasts can get cancer. Are breasts an example of antagonistic pleitropy? You can go down this rabbit hole with any gene or body part
18:08 < hprmbridge> Eli> Can someone name something in humans that is 100% antagonistic pleitropy?
18:11 < hprmbridge> Eli> Google says testosterone is antagonistic pleitropy, but there are certain environments where high t is going to result in reduced fitness. So, there we are back to: it’s just contextual based on the environment.
18:11 < hprmbridge> Eli> With is literally just normal evolution without requiring new terminology
18:12 < muurkha> in chimpanzees, mammary hypertrophy is limited to when the mother is nursing
18:12 < hprmbridge> Eli> If we are going to use the antagonistic pleitropy term it should come with a big asterisk
18:13 < muurkha> *o
18:14 < hprmbridge> Eli> Isn’t there hypertrophy when humans are nursing? I lack the equipment to be an expert on the matter
18:21 < muurkha> yes, but also when they aren't, just less so
18:21 < hprmbridge> nmz787> It's more engorgement
18:21 < hprmbridge> nmz787> Log splitter acquired... https://cdn.discordapp.com/attachments/1064664282450628710/1118711937144987658/6e96296a-f797-4c3e-9089-069bdf609573.jpg
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22:02 < hprmbridge> nmz787> It works after cleaning the carb, replacing an o ring and adding an inline fuel filter https://cdn.discordapp.com/attachments/1064664282450628710/1118767540156502096/PXL_20230615_032525999.MP.jpg
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23:29 < fenn> https://old.reddit.com/r/SNPedia/comments/jrjppc/whats_happened_to_the_snpedia_community/
23:29 < fenn> crypto SNP blockchain encyclopedia when
23:29 < fenn> with AI(tm)
23:29 < fenn> but seriously i had no idea promethease was acquired by myheritage
23:31 < fenn> an open source database of genotype/phenotype correlations seems pretty damn important, whether it's "legal" or not
23:46 < hprmbridge> nmz787> I was just talking about how my snp data felt basically worthless after whatever health medical advice law crushed all the actually interesting data analysis on 23andme
--- Log closed Thu Jun 15 00:00:31 2023