UmbralRaptor changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> … one of the other grad students just compared me to nomal O_o | <ferram4> I shall beat my problems to death with an engineer.
<UmbralRaptor> Apparently the moon is way lower than I thought.
* UmbralRaptor does not low at the moon.
<egg> UmbralRaptor: please do not alter the path of the moon as it would interfere with principia releases
<UmbralRaptor> egg: but it would be really convenient to move the path of totality through Fairfax!
<egg> UmbralRaptor: so um as long as you keep the conjunctions at the same time I guess I'm fine
<egg> but with the very-third-body movement seems hard to find another orbit with the same conjunctions?
<UmbralRaptor> (The whole GMU thing means my eclipse viewing is going from "winging a day trip to KC or Rolla" to "probably not, unless someone else has plans I can ride on")
<Ellied> UmbralRaptor: you should scamper down to southern IL and join the DePaul physics department :D
<Ellied> wait just kidding, we're going to Perryville, MO
<bofh> Why there given totality should be over southern IL even?
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<egg|zzz|egg> zzz
<UmbralRaptor> The birds have spoken.
<bofh> https://youtu.be/kOKBL1XHcB0 venting acetylene into a *WOODEN SHED*?!?
<kmath> YouTube - CSB Safety Video: Dangers of Flammable Gas Accumulation
<Ellied> bofh: shrug
<Ellied> about the first one
<bofh> ...I was about to say
* UmbralRaptor stares at schedules and driving times.
* UmbralRaptor stares at how long it's taken to get various things done related to moving.
* UmbralRaptor stabs things.
<Ellied> :(
<UmbralRaptor> Pretty much. Load stuff onto the moving truck: 11th or 12th. Drive out to PA: ?-13th or 14th. EPRV conference: 14-17th. Unload truck/apartment move in: 18th.
<bofh> That sounds "fun".
<UmbralRaptor> Oh, right. Not listed: PA -> VA drive: 17th or 18th.
<UmbralRaptor> Yeah.
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<egg|zzz|egg> !wpn bofh
* Qboid gives bofh a superheterodyne observable-like factor
<kmath> <Newpa_Hasai> Proposal: we should call Sci-Hub "the other bird website" ??️
<egg|zzz|egg> !wpn whitequark
* Qboid gives whitequark a commutative expansion
<egg|zzz|egg> whitequark: how are the cats
<whitequark> egg|zzz|egg: the kitten got sick but has since got better too
<whitequark> vet said to, so we had to inject it with a lot of shit
<whitequark> antihistamines, spasmolytics, vitamins and buffer solution
<whitequark> it's interesting how much easier than humans animals tolerate injections
<whitequark> subq? not even ever an issue. im? painful but not even close to creating a fear response
<egg|zzz|egg> yeah
<egg|zzz|egg> whitequark: is the kitten still as smol as it was?
* egg|zzz|egg wonders whether it's smol because it's a kitten or is just smol
<whitequark> not quite as smol
<egg|zzz|egg> whitequark: also where does the spelling "smol" come from, I'm pretty sure I got that from you
<whitequark> weird twitter i think
<egg|zzz|egg> whitequark: is there such a thing as non-weird twitter
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<egg|zzz|egg> !u ″
<Qboid> U+2033 DOUBLE PRIME (″)
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<Sarbian> Let me share my failure to estimate object size from specs : https://twitter.com/Sarbian/status/893817621241634816
<kmath> <Sarbian> That new PC case looked smaller in the catalog... #OnSale #CompulsiveBuyer #MassiveFail https://t.co/n4KbO5iQq1
<Thomas> looks like a mini fridge
<Sarbian> And it s nearly the size of one :(
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<soundnfury> !u ›
<Qboid> U+203A SINGLE RIGHT-POINTING ANGLE QUOTATION MARK (›)
<soundnfury> !u ’
<Qboid> U+2019 RIGHT SINGLE QUOTATION MARK (’)
<soundnfury> !u ′
<Qboid> U+2032 PRIME (′)
<egg|zzz|egg> !u u+2034
<Qboid> U+2034 TRIPLE PRIME (‴)
<soundnfury> 0x2032 == 8242 == 2 * 13 * 317 is most definitely composite.
* soundnfury is disappointed in the Unicode consortium
<egg|zzz|egg> is it a Grothendieck prime though
<egg|zzz|egg> Fiora: on the subject of exciting rocket fuel chemistry, I assume you've seen this wonderful video? https://www.youtube.com/watch?v=gsTLJuQa4VM&feature=youtu.be&t=72
<kmath> YouTube - clf3
<egg|zzz|egg> !wpn bofh
* Qboid gives bofh an ones-complement tensor
<soundnfury> Iskierka: I mean, he's right. The representation gap on CS _does_ result from biological differences [from a population statistics perspective] between the sexes
<soundnfury> This is not the same as claiming women are less qualified than men (as the Vice article puts it); that's a statement about _individuals_.
<soundnfury> instead, there are _fewer_ women than men capable of working in the field (note that it's capability, not qualifications, that really matters), and of those who are, fewer of them _want_ to, because of differences in psychology of motivation
<soundnfury> really, on this issue it's those who reject the idea of there ever being mental differences between the sexes who are the science deniers
<soundnfury> </rant>
<soundnfury> (we now return to your regularly scheduled pictures of Grothendieck cats)
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<icefire> clf3 is a horrible, horrible substance
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<Fiora> okay, sure, clf3 is bad
<Fiora> but what about clf5
<Fiora> that's even more fun
<egg|zzz|egg> Fiora: oh they wanted to use it in Clementine iirc?
<Fiora> i still cannot believe that someone was like
<egg|zzz|egg> nay Clementine 2
<Fiora> chlorine trifluoride is great
<Fiora> LETS FLUORINATE IT
<egg|zzz|egg> :D
<Fiora> AT HIGH TEMPERATURES AND PRESSURES
<Fiora> and not only that, they discovered a catalyst
<bofh> Nickel Difluoride iirc?
<Fiora> yup
<Fiora> nickel(II) fluoride
<bofh> I'm still amused at the series of Fluorine Oxides, it's as if someone kept asking A.G. Streng "that's good, but can you add *moar* Oxygens?"
<bofh> I don't think I was able to find a synthesis of O5F2 but let me check again.
<bofh> They're great if you want to violently explode things at cryogenic temperatures.
<bofh> also that video is nothing short of hilarious/horrifying.
<egg|zzz|egg> Fiora: I like that in that video they disappointedly say "not much happened, there was no explosion" after the clean leather sample
<bofh> egg|zzz|egg: OHH THAT'S WHAT THEY SAY
<egg|zzz|egg> and then the conclusion "with a leather suit you have about 7 seconds to get out"
<bofh> but now you have exposed skin and that seems like not an improvement :P
<egg|zzz|egg> also, the start of the video says its staff training at COGEMA
<egg|zzz|egg> what does their staff do
<bofh> COGEMA?
<Qboid> bofh: [COGEMA] => COmpagnie GÉnérale des MAtières nucléaires
<bofh> Welp
<bofh> That wasn't quite the answer I wanted.
<egg|zzz|egg> !g COGEMA
<Qboid> egg|zzz|egg: https://en.wikipedia.org/wiki/Areva_NC [Areva NC - Wikipedia] (15900 results found, took 0.62s)
<egg|zzz|egg> bofh: ^
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<bofh> yeah I kind of figured from the "MAtières nucléaires" bit
<bofh> by "that wasn't quite the answer I wanted" I meant "oh god, I did not want to hear that it's a department that works with nuclear shit" :P
<egg|zzz|egg> :D
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<kmath> <anisotropi4> @FioraAeterna Highlights for me are the jazz flute noodling and the commentors' apparent disappointment that dry leather doesn't explode
<bofh> egg|zzz|egg: the jazz flute makes it
<bofh> oh, 12BN6 came in in one piece. time to use it in some terrible audio effects circuitry >:D
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* UmbralRaptor totally misread that as B12N6, and assumed bofh was going to explode something.
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<egg|zzz|egg> UmbralRaptor: cat!
<egg|zzz|egg> UmbralRaptor: hm, https://github.com/pdn4kd doesn't list all your affiliations, it's missing NAFO :-p
<UmbralRaptor> NAFO doesn't lend itself to github repos.
<egg|zzz|egg> UmbralRaptor: also https://en.wikipedia.org/wiki/ANBO_I
<UmbralRaptor> o_O
<UmbralRaptor> Is it good for surveying cows?
<UmbralRaptor> Unrelated, apparently a bunch of Fiora's followers need to be introduced to John Clarke and Derek Lowe :D
* UmbralRaptor stabs Twitter. Let me reply to the lucky 10k without tagging in people who already know!
<egg|zzz|egg> UmbralRaptor: you can but you need to uncheck it from the list afaict
<UmbralRaptor> Done.
<UmbralRaptor> stabbity
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<Fiora> UmbralRaptor: i'm surprised, because i've been told about 1829361 times to read "things i won't work with"
<Fiora> to the point where i am actively bitter about it
<Fiora> because it's fairly clear 98% of people interested in chemistry literally have only read that one blog
<UmbralRaptor> Hrm. Looks like there was only one in the replies.
* UmbralRaptor 's mind is going?
<Technicalfool> https://www.youtube.com/watch?v=71wPKALp7X8 Sarbian - I'm sure you wouldn't be that mean to Manley. Would you?
<kmath> YouTube - How Does Launching From Equator Help Rockets?
<Technicalfool> (he's referring to the "Mechjeb developer" calling him stupid)
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<Sarbian> Technicalfool: I am watching. I feel I won't like that
<Technicalfool> heh, he's on about there being no method in mechjeb to combine manouevers, that he knows of. But the dev will surely correct him and call him stupid.
<Sarbian> If only that button had been added 13 days ago.
<Qboid> [05090] title: Merge pull request #915 from abortz/merge-nodes... by sarbian | Additions: 16 | Deletions: 0 | https://github.com/MuMech/MechJeb2/commit/050907227723442192bf566bb151be45ed4ff549
<Technicalfool> pffheh. Well, 13 days isn't a huge amount of time and he might have been compling that video for a while, to be fair.
<Technicalfool> or even, compiling.
<Technicalfool> Shall I tell him, or is there about to be a snarky response in the Youtube comments section? :P
<kmath> <Sarbian> @DJSnM Hey @DJSnM , it s already here (in the dev build). You were too stupid to find it ;) https://t.co/lAS1RVz9oU
<Technicalfool> hah
<Sarbian> Crap, double mention
<Technicalfool> well, that was stupid.
<Technicalfool> (I'll hide now)
<egg|nomz|egg> Sarbian: :D
<egg|nomz|egg> Sarbian: also, on a un kountdown ici now
* egg|nomz|egg is pas sicuro which Sprache er speaks
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<egg> !kd next
<Qboid> egg: ID: 0 | Name: H-2A • Michibiki 3 | Time: 2017-08-11 07:00:00 | Unixtime: 1502434800 | Left: 5d 10h 56m 44s
<Qboid> egg: Description: A Japanese H-2A rocket, designated H-2A F35, will launch the Michibiki 3 navigation spacecraft, the third member of Japan’s Quasi-Zenith Satellite System.
<egg> Sarbian: ^
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<Sarbian> I am not awake at that time ;p
<egg> Sarbian: hm
<egg> Sarbian: it gives UTC+2 though afaict
<egg> (which might be a bug)
<egg> Sarbian: also, "il est 5 heures, Paris s'éveille"
<egg> Thomas: can you indicate the timezone of the time you give? it's very convenient for Sarbian or you or me, but for others on this channel UTC+2 without mention of the timezone might be confusing
<Thomas> It is "DateTime.UtcNow" so shouldn't it be UTC-0?
<Sarbian> egg: for me it's "il est 5 heures et j'ai encore 4H de sommeil"
<egg> Thomas: oookay so then there's a bug in the date *parsing*
<Thomas> ?
<egg> Thomas: please use DateTimeOffset
<egg> DateTime doesn't know whether noon is in Saigon or in Bourg-en-Bresse
<egg> DateTimeOffset contains its offset from UTC
<egg> (also add e_14159 and Stratege to the logical disjunction above they're in CEST too)
<e_14159> egg: Now find a regex accepting a username in this channel iff they're on CEST.
<egg> aaaa
<Thomas> Hmm, I dont quite understand the difference between using DateTimeOffset and using DateTime and just treating all times as UTC times
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<bofh> 18:16 <@Fiora> because it's fairly clear 98% of people interested in chemistry literally have only read that one blog
<bofh> what kind of really irks me are the folks that not only have only read that one blog, but only that one column on that blog
<bofh> since they don't seem to care about any of the (quite fascinating honestly) med-chem posts on there it seems.
<egg> !wpn bofh
* Qboid gives bofh a rubidium 555 timer
<egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a tellurium labeled gluon
<kmath> <sigfig> when ur cities are just too damn tall and you can't get gps signal any other way https://t.co/bkAjhK7mBJ
<egg> synchronous orbit with a молня-like inclination!
<egg> !kd next
<Qboid> egg: ID: 0 | Name: H-2A • Michibiki 3 | Time: 2017-08-11 07:00:00 | Unixtime: 1502434800 | Left: 5d 9h 23m 26s
<Qboid> egg: Description: A Japanese H-2A rocket, designated H-2A F35, will launch the Michibiki 3 navigation spacecraft, the third member of Japan’s Quasi-Zenith Satellite System.
<egg> it's this one ^
<UmbralRaptor> Seems a bit eggcentric also?
<egg> UmbralRaptor: well yes
<egg> UmbralRaptor: there would be no point in the молняlike inclination otherwise
<egg> (that Cyrl custom layout was a worthwile time investment :-p)
<UmbralRaptor> bofh: The Alzheimer's results there are depressing, though.
<kmath> <MicroSFF> The killer drones assessed the others' capabilities and ran simulations. "You'll win." "Marginally." "Is it worth it?" "Disengaging." "Bye."
<bofh> UmbralRaptor: Alzheimer's is depressing, full stop.
<bofh> 21:33 * Qboid gives bofh a rubidium 555 timer
<bofh> I have one of those, it's called an FE-5680A
<bofh> it's amazingly stable as a 10MHz sinewave reference.
<UmbralRaptor> bofh: yeah, but that there apparently have been huge treatment efforts with basically no successes.
<bofh> UmbralRaptor: like that's what I've meant. we have no fundamental idea what is going on at a low level or why, and for all we know once symptoms/pathology sets in it's too late to do much.
<UmbralRaptor> ah
<kmath> <everyonesai> https://t.co/0e3FDKkQLv
<egg> bofh: I will have a question about type safety, abstractions, and tangent bundles soon
<bofh> egg: so not qualified to answer about the first, prolly not about the second, totally okay about the third :P
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<bofh> 21:33 < bluecat> or does anyone know where to buy a copy of that game thats like set but over Z2 instead of Z3 and is like 6 component vectors
<bofh> 22:06 < mlbaker> bluecat: battletoads?
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<egg> bofh: I feel like I'm missing context
<bofh> egg: that's all the context there is. I'm mostly just marvelling at the utter non-sequitor of an answer that "battletoads" is there.
* UmbralRaptor guesses that despite the name, the game has nothing in common with Setesh?
<bofh> Fiora: ahh. also rofl the Battletoads logo in the style of Chrono Cross.
<egg> bofh: so the question pertains to #1506
<Qboid> [#1506] title: A tale of tangent bundles | We bungled them up. | https://github.com/mockingbirdnest/principia/issues/1506
<bofh> okay, few mins
<Qboid> [8aa5e] title: that was embarrassing by Robin Leroy | Additions: 9 | Deletions: 6 | https://github.com/mockingbirdnest/Principia/commit/8aa5e56ba7ed384fc92b43d05849c0116e59be72
<egg> bofh: background: we have RigidMotion, which can transform DegreesOfFreedom (a Position and a Velocity) from one reference frame to another (at a fixed time). It is possible to access the orthogonal map of the RigidMotion (what happens to the basis alone), because I think that makes sense/is well-defined/something. It is all too easy to transform a Velocity by that and get a Velocity (extracted from DegreesOfFreedom) in
<egg> the right frame although it's not the right velocity (because that velocity shouldn't transform linearly)
<bofh> Oh, so RigidMotion is just a Galilean Transform?
<egg> bofh: it's the derivative of a RigidTransformation
<bofh> ...right. Derivative, hurr.
<egg> bofh: includes a free proof that angular velocities makes sense in the comments because why not :-p https://github.com/mockingbirdnest/Principia/blob/master/physics/rigid_motion.hpp#L61-L64
<bofh> that was actually going to be exactly my next question so :P
<bofh> !u ??
<Qboid> U+1D598 MATHEMATICAL BOLD FRAKTUR SMALL S (?)
<Qboid> U+1D52C MATHEMATICAL FRAKTUR SMALL O (?)
<egg> bofh: what was your question exactly?
<bofh> why is it true for certain that angular velocity vectors lie in the tangent space here
<egg> ah :D
<egg> bofh: also, crap, that's a bold s and a non-bold o, what have I done
<bofh> Yeah, I did !u to make sure I wasn't hallucinating the non-bold o
<bofh> :P
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<egg> bofh: well I guess that's an issue I'll need to fix :-p Anyway the question is whether there's some operation that I should forbid or some algebraic structure that's almost-but-not-quite a vector or something that I cuold have so I don't do that by mistake
<egg> which seems tricky: DegreesOfFreedom is the tangent bundle of Position, and tangent vectors are vectors surely...
<egg> and the orthogonal_map of the RigidMotion does make sense on vectors, that's what happens to e.g. a displacement
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<Fiora> are there any notable common metals that are reacted with by methyl ethyl ketone, cyclohexane, tetrahydrofurane, or acetone
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<egg> Fiora: tetrahydrofuran seems non-pretty with a bunch of stuff http://www.quickcutgasket.com/pdf/Chemical-Resistance-Chart.pdf Al, Bronze, Cast Bronze, Cast Fe, even questionable with carbon steel according to http://www.balseal.com/sites/default/files/tr60c_020707132612.pdf
<bofh> THF is nasty, yes.
<Fiora> oh. unfun
<Fiora> i was hoping to use it as a 3d printer nozzle cleaner
<bofh> Acetone is good, but will react over time with crappy grades of steel (it *is* mildly acidic), but should be okay with cleaning. Same with MEK.
<Fiora> which means it has to be okay with... nickel, stainless steel, brass, I think?
<Fiora> and possibly aluminum
<Fiora> ... huh. it reacts with cast iron, but not steel??
<bofh> by stainless you mean SAE 3xx series (if you know)
<Fiora> basically THF is the only chemical i can pick up at home depot that will dissolve polylactic acid
<bofh> Ahh.
<Fiora> MEK does nothing
<bofh> Oh, right, you can pick up THF at the home despot.
<Fiora> it's in PVC pipe cleaner
<bofh> yep.
<Fiora> which is part THF, part acetone, part cyclohexane, part MEK
<bofh> what %?
<Fiora> it varies and the MSDS doesn't specify exact
<Fiora> on a particular brand:
<bofh> (I only care about the first. cyclohexane won't be a problem, I store Sodium Metal in it)
<Fiora> MEK: 4-14%, THF 5-15%, cycleohexane 2-17%, acetone: 60-80%
<Fiora> a different brand: acetone 20-40%, MEK 20-40%, THF 15-35%, CH 10-30%
<Fiora> ez weld: 0-25% acetone, 20-85% MEK, 5-15% CH, 5-12% THF
<Fiora> pvc pipe cleaner is quite possibly the nastiest shit that ordinary consumers are likely to have ever used
<bofh> Yeah, that stuff's fairly nasty.
<bofh> It's not quite Pirhana Sol'n Nasty, but most people (mercifully) won't be using that.
<bofh> My fav "feature" of THF on its own is forming explosive peroxides over time (but so will most ethers)
<bofh> Anyway that should all be fine if you clean it off quickly assuming that there's no Al. I recall Al + THF is nasty but not how.
<egg> bofh: those compatibility charts get weird; it is questionable to store tomato pulp in stainless 302 or 304
<Fiora> that's interesting because, so like