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.
Technicalfool_ is now known as TechnicallySleeping
awang has joined #kspacademia
egg|phone|egg has joined #kspacademia
<Greys>
why is it that gas pressure gets to have domain units but temperature has to all be science degrees?
<egg|phone|egg>
!wpn whitequark
* Qboid
gives whitequark a blue pen which strongly resembles a measure
<UmbralRaptor>
Well, plasma temperatures are sometimes measured in keV…
<Iskierka>
also definitions of temperature become arguable. Using the fundamental thermodynamic definition can allow a point where you pass infinity degrees into negative degrees
<whitequark>
you can also measure temperature in nJ/GB
<soundnfury>
yeah, if you take k = 1, then temperature is in, uh... energy_unit * nat?
<soundnfury>
oh, / nat, right
<soundnfury>
Iskierka: surely the way to deal with that is to just always work in inverse temperature (nats per joule) instead
<Iskierka>
energy is simpler as there's never an inversion of defined behaviour
<soundnfury>
UmbralRaptor: it's a _correct use_ of entropy
* soundnfury
gives UmbralRaptor a Gibbs paradoc
<whitequark>
"1 Kelvin of ambient temperature requires one to thermalize about 76.5594 picoJoules of ordered energy for every teraByte of subsystem correlation-information created"
<whitequark>
this is a pretty nutty concept. i love it
<egg|phone|egg>
!Wpn -add:adj thermal
<Qboid>
egg|phone|egg: Adjective added!
e_14159 has joined #kspacademia
<soundnfury>
How do you describe the effect of a weapon that operates by directly dumping large amounts of entropy into its target?
<soundnfury>
Ludicrous Gibbs.
<whitequark>
lol
<soundnfury>
if #kspacademia wrote a scifi novel, would literally every in-universe weapon be called a Gauss rifle?
<UmbralRaptor>
Only if we can have several very different weapons that can semi-legitimately use that name.
<soundnfury>
I'm fairly sure we can, which is the point
<soundnfury>
man, after listening to Beethoven symphonies all day, the Mozart Haffner just sounds so... _tame_.
<soundnfury>
(although that's partly because this recording is too slow.)
<FluffyFoxeh>
can't listen to music right now anyway because I'm on my phone and my earbuds are broken
<soundnfury>
awww, poor you! (todo: learn how to express sympathy without sounding sarcastic)
<FluffyFoxeh>
lol
<soundnfury>
(from the greetings-fellow-carbon-based-lifeforms-i-also-enjoy-respiring-oxygen files)
* Ellied
imagines soundnfury as a member of Mobile Task Force Tau-5 ("Samsara")
<soundnfury>
"you see... it is a pun"
<G-Mobile>
any'a yall worked with object databases before?
<soundnfury>
or as slartibartfast might have phrased it "it's a kind of joke you see; I'm not very good at them myself but I'm told they can be rather effective"
<Ellied>
I have exactly one gripe with this album, and it's that the pauses at the end of tracks are too short. It's so intense, I need a good second or two to cool down before I'm ready to go again. :P
<G-Mobile>
science has gone too far
<G-Mobile>
oat milk
ferram4 has quit [Ping timeout: 383 seconds]
<egg|phone|egg>
!Wpn котя
* Qboid
gives котя a lambda infinity
<egg>
!wpn whitequark
* Qboid
gives whitequark a rhenium tensor
<egg>
!wpn Fiora
* Qboid
gives Fiora a toasted vanadium pig
<Fiora>
wah
<egg>
!wpn bofh
* Qboid
gives bofh a thulium impenetrability condition
<bofh>
FINALLY, someone else got around to applying BFGS to the iteration step in a quantum chemistry *SCF/CAHF implementation.
<bofh>
"...A dramatic speed-up is provided by the well-known Quasi-Newton Method[20]..." no shit :P
<bofh>
hopefully the age of everyone using variations of I Can't Believe It's Not Gradient Descent for literally everything are starting to come to an end...
<egg>
bofh: tbh principia has only Bisect as a root finder :-p, so that's not even I Can't Believe It's Not Gradient Descent
<bofh>
egg: well okay but I'm pretty sure that any optimizations done in Principia *prolly* correspond to extremely simple Lagrange multipliers with nice structure anyhow :P
<egg>
!acr -add:CERES Computational Emulator of Rare Earth Systems
<Qboid>
egg: I added the explanation for this acronym.
<egg>
bofh: mostly the largest cost in Principia is "evaluating the чебышёв polynomials that describe the ephemeris"
<egg>
it used to be that and plotting, but version чебышёв made plotting fast
<bofh>
wait, *evaluating* those?
<bofh>
like Clenshaw's Algorithm is pretty damn fast
<egg>
yes, they're in the right hand side of the differential equation, so we evaluate a lot of them
<egg>
and some of them have obnoxiously high degree
<egg>
I was pondering making them constant-low-degree, variable timespan, instead of the current "9 steps, lowest degree with a small residual" (which comes from a paper by Newhall on an early DE)
<bofh>
9 steps seems a tad excessive?
<egg>
bofh: in which direction?
<egg>
our step is 10 min
<bofh>
oh, no, that may be required.
<bofh>
I was thinking it might be a bit too excessive but I was also assuming your timestep was much smaller than it is so :P
<egg|phone|egg>
Bofh: well for Venus I think 9 is small
<egg|phone|egg>
Moons are a mess
<egg|phone|egg>
That's our problem in a nutshell, moons are a mess
egg|cell|egg has joined #kspacademia
<egg|cell|egg>
Bofh: e.g., how do you deal with the Jovian system while in leo
egg|phone|egg has quit [Ping timeout: 183 seconds]
<G-Mobile>
if there were a solar system like ours but the only planets were an earth like object and another earth like object at the first planet's L3, with no other objects in the system that earth A could see, would it's inhabitants be able to infer the existence of earth B from earth A's own orbital parameters?
<G-Mobile>
also are lagrange points labelled in order of discovery? seems weird
<G-Mobile>
looking at an earth/moon lagrange graphic; L3 is actually inside the moon's orbit? So earth B would have to be inside of it's natural orbit to actually be at L3, and likewise earth A would be pulled inward towards bL3, which would probably cause an exargerated elipse as they move in and out through the orbit
<G-Mobile>
the question would be how much of an impact this would have
<G-Mobile>
wait, the earth-sun L3 is outside of earth's orbit?
<G-Mobile>
is the earth-moon L3 inside the moon's orbit because the mass ratio is closer to 1?
<G-Mobile>
or, was I lied to by a graphic
<egg|cell|egg>
L3 is slightly outside always? also positive Ляпунов exponent but long Ляпунов time
<G-Mobile>
do all mathematicians learn cyrillic?
<G-Mobile>
so graphic lied; opposite conclusions, if you start with symmetric positioning and equal but rotated orbits, they'd be pulled outward by L3, and actually because the elipticalitisms would be opposite, when one earth is closer the other is further, so the gravitational strength would kind of wash out
egg|cell|egg has quit [Read error: Connection reset by peer]
<G-Mobile>
assuming there's an equilibrium point and that the force is significant, each planet would find itself to have a higher perihelion than would otherwise be predicted?
<egg|work|egg>
<G-Mobile> do all mathematicians learn cyrillic? <<< perhaps they don't, but they should
<G-Mobile>
so this other graphic depicts the asteroids we're tracking what with the greeks and the trojans, and then there's the hildas for L3, but the hildas are entirely inside jupiter's orbit and then there's one green dot up out past the orbit, the hildas are being pulled up from the asteroid belt where the trojans and greeks are established into the lagrange. I'd still think that given millions of years there would be asteroids up in L3
<kmath>
<ctrlcreep> A false negative is when no demons are detected inside of your body. A false positive is when the priest mistakenly exorcises your soul
<kmath>
<scattermoon> So what I take from this is the more developers you add to a project, the greater your chance to summon a demon. https://t.co/h3I5NwkoYM
<APlayer>
egg: A question, as a person who never tires Principia. Is there any kOS compatibility regarding the flight planner? I.e. may I read and write to the flight planner data using kOS?
<APlayer>
never tried* Principia
BPlayer has joined #kspacademia
APlayer has quit [Ping timeout: 204 seconds]
APlayer has joined #kspacademia
APlayer has quit [Ping timeout: 383 seconds]
egg|phone|egg has joined #kspacademia
egg|phone|egg has quit [Remote host closed the connection]
* Qboid
gives bofh a postorder Lambert interferometer
<egg>
!wpn Fiora
* Qboid
gives Fiora an isochoric yxala
<egg>
!wpn Ellied
* Qboid
gives Ellied a central walnut
ferram4 has quit [Read error: Connection reset by peer]
<egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a Euclidean exception
* UmbralRaptor
explodes in a cloud of toroids.
<G-Mobile>
Many of the toroid are destroyed, some are entangled due to the circumstance of their creation, most of the rest collapse into spheres, by a few establish hydrostatic equilibrium and start fusing hydrogen
<G-Mobile>
but a few*
<egg>
UmbralRaptor: why are you using the flat torus
<G-Mobile>
I wonder how fast a toroid star would have to spin
<UmbralRaptor>
egg|work|egg: Non-mathematical authorship is wild.
* Ellied
did something sort of silly.
<Ellied>
I got fed up with shitty laptop chargers breaking so I opened my toughbook up and have been working on replacing the charging connector with a BNC jack.
<Ellied>
it's been a little gory so far but I think it'll work
<Ellied>
replacing the low-voltage wire on the charger brick with another BNC jack worked just fine.
<Iskierka>
this sounds like a very Ellied thing to do
<egg>
Ellied: so you can plug MHV in it?
<Ellied>
egg: aaaaaaaa
<Ellied>
it would be fun to design a laptop power supply that would just accept whatever voltage/polarity/frequency through an MHV jack in the side of the machine
awang has quit [Read error: Connection reset by peer]
<Ellied>
like between 2 and 2000 volts or something
awang has joined #kspacademia
<whitequark>
Ellied: NICE
<whitequark>
reminds me of minecraft
<Ellied>
wait, definitely SHV and not MHV
<Ellied>
it would be really fun if you could make the rectifier crazy fast, so it could run on RF power supplies. Someone: "Are you seriously using the APS RF to charge your laptop" Me: "Yes"
<Ellied>
it would be completely hilarious to have a laptop where you could just plug it into an arbitrary power connector on a patch panel and probably have it work
<Ellied>
especially since that would often involve a BNC to SHV cable with the SHV end in the laptop
<egg>
!wpn котя
* Qboid
gives котя a plutonium breadboard
<APlayer>
Ellied: Reminds me of people who didn't have fitting adapter cables and came up with a combination of them. The contraption was meant to power a camera and involved an intermediate HDMI adapter.
BPlayer has quit [Read error: Connection reset by peer]
<egg>
UmbralRaptor: do you feel like eggsplaining physics to a confused cat on the fora https://forum.kerbalspaceprogram.com/index.php?/topic/162200-wip122-and-13-principia%E2%80%94version-ces%C3%A0ro-released-2017-09-20%E2%80%94n-body-and-extended-body-gravitation-axial-tilt/&page=33&tab=comments#comment-3185134
<UmbralRaptor>
Now is bad, maybe in 5 hours?
APlayer has quit [Ping timeout: 204 seconds]
icefire has joined #kspacademia
<Ellied>
oh man joke circuit diagrams are my favorite thing in the world
<Ellied>
many of my older designs have a component labeled "watermelon" in them somewhere
<bofh>
Nice! Got any good pics of joke circuit diagrams?
<egg>
UmbralRaptor: well, she was about to, but in doing so she broke an assertion within Principia
<UmbralRaptor>
hrm
<egg>
UmbralRaptor: (she was just standing on the ground and jumping, principia then noticed her and drove her along her geodesic and into the ground)
<egg>
UmbralRaptor: also she looks really happy about this state of affairs
<UmbralRaptor>
Anyway, I took a shot at a reply.
<egg>
UmbralRaptor: yeah, I think the momentum change thing is mostly people misunderstanding
<egg>
UmbralRaptor: in the limit as m->0 the same thing happens to the test mass, and the planet isn't nudged, and both simulations aim for that
<UmbralRaptor>
egg: You should post that quote by ferram4?
<egg>
which?
<ferram4>
Are they asking for planets to loose momentum despite the fact that it almost certainly will fall below what can be represented with double-precision floating point numbers?
<ferram4>
Also, lose, not loose
<SnoopJeDi>
Cry "malloc()!" and let slip the momenta of war
<SnoopJeDi>
man, tom7's SIGBOVIK submission from this year is really good. I dug up the link for an obscure reason, but now I'm just re-watching it.
<SnoopJeDi>
Compilers are insane.
<Iskierka>
he says "we don't have interrupt" and I'm just waiting to see him have the code self-edit sections to become needed instructions outside range at runtime
<SnoopJeDi>
You will be rewarded
<Iskierka>
I did use that trick to have a programmable music box on one of the simplest CPUs possible, using it in x86 is much scarier :p
<Iskierka>
but all I did was increment a load address for the note, and then if no note existed edited it to be a save instruction later after reading the desired note
<egg>
Iskierka: oh you're a space unicorn on the fora too
<Iskierka>
... I don't remember putting it on the KSP fora but I've put it in most places I thought of
* egg
clicks on Iskie's profile ends up on a palaeobiology thread on the fora, and remembers that the fora are a silly place
<egg>
UmbralRaptor: don't go there, it's a silly place
<egg>
UmbralRaptor: they say terrible things about you
* egg
pets UmbralRaptor's feathers
<Iskierka>
SnoopJeDi, does he at some point manage to format it in LaTeX just to make it as silly as possible?
<SnoopJeDi>
I wish!
<egg>
...and that tiger person replies to you and the point has slingshotted around them without any transfer of insight...
* egg
stabs the fora
CPlayer has quit [Read error: Connection reset by peer]
<Qboid>
7d 0h 0m 0s left to event #11: 「みちびき4号機」／H-IIAロケット35号機 [at 2017-10-09 22:00:00]. Say '!kountdown 11' for details
<Fiora>
i dont wanna be stabbed
<Iskierka>
provided a follow-up
<egg>
Fiora: you're safe, hold on to that i tho :-p