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.
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<egg|z|egg>
!wpn Iskierka, UmbralRaptor, whitequark, et alii
* Qboid
gives Iskierka, UmbralRaptor, whitequark, et alii a trombone
<egg|z|egg>
Aliis? Should be dative right
<UmbralRaptor>
!wpn egg|z|egg
* Qboid
gives egg|z|egg an alpha motor
<egg|zzz|egg>
UmbralRaptor: a turbine where the working fluid is α particles
<UmbralRaptor>
I'm going to assume that for some reason we have 2 electrons for every alpha, and they keep on recombining on us, so it's not really a plasma.
<egg|zzz|egg>
UmbralRaptor: from the methods section of the TRAPPIST paper: ""Initial assessment of the system’s long-term stability. We investigated the longterm evolution of the TRAPPIST-1 system using two n-body integration packages: Mercury52 and WHFAST57. We started from the orbital solution produced in Table 1, and integrated over 0.5 million years (Myr). This corresponds to roughly 100 million orbits for planet
<egg|zzz|egg>
b. We repeated this procedure by sampling a number of solutions within the 1σ intervals of confidence. Most integrations resulted in the disruption of the system on a 0.5-Myr timescale.""
<egg|zzz|egg>
uh, that's perhaps too many quotes
<UmbralRaptor>
The compiler will disrupt that line on a 0.5 s timescale.
<egg|zzz|egg>
UmbralRaptor: I should try replicating this stuff, this seems right up principia's alley; problem is finding the solutions fitting the observations
<egg|zzz|egg>
UmbralRaptor: that's a 68 dof minimization problem
<egg|zzz|egg>
UmbralRaptor: and I don't know how to do these things
<egg|zzz|egg>
can somebody around here into high-dimensional minimization problems
<egg|zzz|egg>
?
<UmbralRaptor>
Uh, something like ameoba simplex might be simplest?
<egg|zzz|egg>
???
<egg|zzz|egg>
"We used two different minimization techniques: Levenberg–Marquardt55 and
<egg|zzz|egg>
Nelder–Mead"
<egg|zzz|egg>
apparently that's the second one?
* egg|zzz|egg
never did any minimization
<UmbralRaptor>
The "best" way involves baysian methods I don't understand presently. But the idea is that you run a solution with some set of parameters, you vary each parameter seperately, and then you look at which ones minimized things and go that way.
* egg|zzz|egg
is a mathematician, not an astronomer (dammit jim)
<egg|zzz|egg>
UmbralRaptor: how do you avoid local minima
<egg|zzz|egg>
I've heard about simulated annealing/simulated quantum annealing at some point
<UmbralRaptor>
egg|zzz|egg: with that? You don't for the most part. There are things with guessing step size based on slope, and kicking around the solution a bit, but local minima are a problem.
<UmbralRaptor>
IIRC
<UmbralRaptor>
Not sure on the details of how annealing type things work.
<UmbralRaptor>
Slowly reducing the step size, but using random directions?
<egg|zzz|egg>
"Nevertheless, most descriptions of SA assume the original acceptance function, which is probably hard-coded in many implementations of SA." whistles
<UmbralRaptor>
...
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<egg|zzz|egg>
!wpn GreeningGal
* Qboid
gives GreeningGal a flipped peculiar explosion which vaguely resembles a geodesic
<UmbralRaptor>
Several pieces of debris travel along space-like trajectories.
<GreeningGalaxy>
prof is even offering a grade deal on the next quiz to give people a second chance
<GreeningGalaxy>
I wonder if there were any other perfect scores
<egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a squeeze cadmium principle
<egg>
!wpn e_14159
* Qboid
gives e_14159 a principal fuse
<UmbralRaptor>
!wpn egg
* Qboid
gives egg a nefarious δ-function
* egg
slaps the nefarious """function""" with a Fourier transform
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<egg>
(it's actually a tempered distribution!)
<egg>
!wpn regex
* Qboid
gives regex a cadmium rotor
<egg>
Qboid likes cadmium today
<UmbralRaptor>
Qboid is trying to poison us.
<UmbralRaptor>
!wpn regex
* Qboid
gives regex an iron check
<egg>
UmbralRaptor: getting a principia config for the TRAPPIST-1 system sounds like a lot of work :-\
<egg>
but then it would be fun to have it
<egg>
but essentially it means replicating the computations from that paper >_>
<GreeningGalaxy>
YIL K*∫δ(x,n0)dx over a bound including n0 is equal to K, even though multiplying a peak with infinite height and zero width by a finite constant is dubious.
<egg>
GreeningGalaxy: YIL?
<egg>
ah, yesterday
<egg>
GreeningGalaxy: it only makes sense if you consider them as tempered distributions
<egg>
otherwise it's just voodoo for physicists
<GreeningGalaxy>
yeah
<egg>
GreeningGalaxy: I have some lecture notes about those if you want
<egg>
they're on github
<GreeningGalaxy>
all the real "delta functions" I deal with in electronics are non-ideal and make perfect sense. They're just a very short pulse with a very large bandwidth.
<GreeningGalaxy>
(in the GHz with avalanche transistors, as it turns out :D )
<GreeningGalaxy>
busy taking my own lecture notes now (ostensibly), will look at that later. IRC is enough of a distraction already
<egg>
it starts with some postprocessed prose, then it turns into raw notes of Trubowitz's silliness
<GreeningGalaxy>
its just circuit analysis though so I'm already zzz
<egg>
including annotations when he starts whistling in the middle of a calculation
<GreeningGalaxy>
heh
<egg>
Lemma "Your life in Fourier land depends on it"
<egg>
the lemmata aren't numbered, so when I refer to it later in the notes it's "the lemma your life depends on" >_>
<GreeningGalaxy>
I had a multivariable prof who was just awesome. He has this great British-Chinese accent, and occasionally stops in the middle of a lecture to talk about the Forces of Darkness, or his research (SQUID)
<egg>
2nd part is the Fourier transform and how it applies to Schwartz space, also relevant
<egg>
GreeningGalaxy: Trubowitz sometimes recited a poem in the middle of the lecture though
<egg>
I imported a package to properly typeset verse
<egg>
in math lecture notes
<egg>
there's To A Skylark in there
<soundnfury>
Through The Fourier Transform, And What GreeningGalaxy Found There
<GreeningGalaxy>
"So you go out wolking on fohrce fieold, okay? wolk, wolk, wolk, wolk. And as you go out wolking, okay, you're pooping! So you're just pooping along, "
<GreeningGalaxy>
(this was our intro to loop integrals)
<egg>
GreeningGalaxy: from an equation in those notes "There's no analogy, just differentiate the damn function!"
<GreeningGalaxy>
heh
<egg>
there are *two* poems by Percy Shelley in there
<egg>
(The other is The Moon)
<GreeningGalaxy>
"There's no analogy" [muffled sobs from physicists]
<egg>
... and there's some Wordsworth
<egg>
"In this course there are only three things you can do"
<egg>
"You can answer in German" "α Betrag im Quadrat plus β Betrag im Quadrat equals one" "That's English"
<UmbralRaptor>
o_O
<egg>
UmbralRaptor: oh the Trubowitz lectures are something to behold
<egg>
there's also the recurring "Who do you gotta call" "Leibniz"
<UmbralRaptor>
For legal or mathematical advice?
<egg>
except once it's the chain rule that's needed, so "Who do you gotta call" "chain rule, but it's not a name" "just call it Chain's rule"
<UmbralRaptor>
(...and why did I tyop that as methematical?)
<egg>
"We're doing this the French way. This is a 5-tuple, the way Bourbaki would write it. To them, mathematics is just a long string of symbols."
<egg>
"Find classical Waldo, and find quantum Waldo"
<egg>
"Actually let's call the Hamiltonian W" (for Waldo)
<egg>
(fortunately he didn't actually do that)
<egg>
(He did have a white chalk H and a red chalk H at some point though)
<egg>
poking bofh because silly notation ^
<soundnfury>
egg: Actually, Bourbaki probably wouldn't write it at all; it'd probably be one of his collaborators :P
<kmath>
<AshleyCsanady> Toronto man charged with witchcraft (yes really). And yes it IS in the Criminal Code but only if you're a fake witc… https://t.co/GodKAUpoly
<kmath>
<charlieabarto> @antumbral @FioraAeterna @merrittk Is software really open source if only one person on earth knows how to build it? (7zip)
<egg>
UmbralRaptor built part of it at some point
<egg>
Norgg used to build it though, so it's not that bad
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<TonyC_>
Hello.
<TonyC_>
could anyone here point me to any famous anti-space exploration advocates ? I need some counter-arguments for a pro-space speech i'm writing and I need to quote some people
Thomas is now known as Thomas|AWAY
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<egg>
bofh LOS
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<egg>
bofh AOS
<bofh>
AOS?
<UmbralRaptor>
TonyC_: in general, or in specifics? I'd me tempted to look at objections to eg: 90 day report (1990?), integrated plan c. 1970, Constellation
<UmbralRaptor>
egg: well, tests anyway
<whitequark>
egg: badly
<TonyC_>
UmbralRaptor, I'm writing a speech related to space advocacy, and i need to oppose counter arguments to the ideas i expose to counter them, and i need quotes ("bloke" said that space exploration is bad because "stuff" but i disagree because "arguments")
<regex>
"english school teacher" > "millenial parade" > "paunchy old white guy"
* egg
isn't really getting it
<egg>
but technical > human talking heads >_>
<regex>
hosted
<regex>
ESA > Space-X > ULA
<regex>
anything's really better than ULA though
<egg>
regex: do ULA use statute miles downrange and nautical miles of altitude
<regex>
I don't recall but most likely
<regex>
just like Space-X uses "miles per hour"
<egg>
yeah >_<
<regex>
after playing so much KSP that confuses the fuck out of me
<soundnfury>
regex: I thought they used km/h?
<soundnfury>
also, techcast has m/s nowadays ^_^
<regex>
Space-X? Nope
<ferram4>
Welcome to America, where we use the BEST units, believe me.
<Qboid>
ferram4: stratochief left a message for you in #RO [29.03.2017 17:36:58]: "I've done a dozen launches with that newest FAR, no trouble or odd behaviour at all"
<egg>
ferram4: I think we're going to have this conversation every time a falcon is launched :-p
<egg>
ferram4: also we're probably periodically going to have the conversation of "how would I go about integrating ballistic reentry" until I get off my arse and get around to it
<kmath>
<DJSnM> Let me be clear, there's no way the metal would have melted, in that short time, but paint could be lost and air can glow. Probably fine.
<ferram4>
...also, metal glows real nice when it's still solid.
<egg>
yup
<egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor an expander reactor
<egg>
!wpn ferram4
* Qboid
gives ferram4 a partially-ordered wrench
<egg>
!wpn Iskierka
* Qboid
gives Iskierka a long unit nib
<soundnfury>
!wpn egg
* Qboid
gives egg an arsenic scalar
<egg>
Iskierka: see, it keeps giving you pens and nibs
<egg>
payload deployed
<bofh>
currently craving questionably decyanidated ORD vending machine ""Italian"" amaretto cookies
<egg>
bofh: O_o
<bofh>
really should just buy a bottle of benzaldehyde and sprinkle it on rice thins or something
<egg>
bofh: °o̤o̤°
<bofh>
egg: so like the ingredients say "apricot kernels (20%)" and I ate way too many of them at once and then got both a headache and tachycardia that I *noticed*
<bofh>
which is IMO very disturbing
<bofh>
so I feel like I shouldn't eat those
<egg>
but didn't you do that already a week ago or something?
<bofh>
yeah, and now I'm getting cravings for them :P
<egg>
write a paper on the addictive properties of cyanide
<egg>
maybe you can get posthumously published in Nature
<bofh>
so the reality is I like how benzaldehyde tastes a lot
<bofh>
it's completely orthogonal to the actual cyanide
<egg>
benzaldehyde on rice thins seems a bit *too* deconstructed to me
<kmath>
<DJSnM> @hey_ghis @SpaceX The first landed booster was special, now this is the first reused booster so it's even more special.
<bofh>
ooh, wow.
<egg>
EtOH?
<egg>
ethanol?
<soundnfury>
yup
* egg
systematically slaps bofh with the IUPAC
<egg>
bofh: but what solvent would you use then
<egg>
bofh: you *probably* want something nontoxic right
<soundnfury>
ehh, it'll be fine. Slap it in some THF.
<egg>
bofh: Wikipedia on the page for benzaldehyde helpfully says it's soluble in liquid ammonia
<bofh>
egg: so its solubility in just water is 300mg/100mL
<egg>
bofh: I see no issues with that as a flavouring agent >_>
<egg>
bofh: I remember in lycée [erm, translating school names is hard, that would be equivalent to Gymnasium I think] getting a beaker of water and a beaker of ammonia solution mixed up
<egg>
bofh: so cleverly I took a good sniff of one to figure out which one it was
<egg>
the "chrono" bit is important, got some non-chrono tablets at some point, that's a bit hard on the liver
<egg>
(gradual release)
<egg>
bofh: also when I do get headaches, a funny thing is that the only thing that works is ibuprofen, never had any luck with paracetamol
<bofh>
paracetamol is hot garbage
<bofh>
like I'm at the point where I'm convinced the only thing it's good for is causing liver failure
<egg>
:D
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<egg>
bofh: tbh accidentally breathing chlorine seems quite bad as far as gases to accidentally breathe go
<egg>
!wpn
* Qboid
gives egg a principal tetrode
<egg>
!wpn GreeningGalaxy
* Qboid
gives GreeningGalaxy a solderless 666 timer
<egg>
Let him that hath understanding count the number of the timer; for it is the number of an engineer; and his number is six hundred threescore and six.
<egg>
(though the number of the actual timer is five hundred twoscore and fifteen right)