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.
<egg>
we need more #floatingpointwithatlas
<bofh>
Fiora: ooh. that'll be interesting/amusing. and actually handy.
<Fiora>
regular reminder that the ppc 750CL has an FMA that is neither single nor double precision, but somewhere in between
<Fiora>
#floatingpointwithdolphin
<egg>
Fiora: you have a pet dolphin?
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<Fiora>
lol
<egg>
Fiora: hmm, atelier seems to be a playstation-only thing though? :-\
<Fiora>
it's on Vita and PS3, and Sophie/Firis are on Steam
<Fiora>
(as well as PS4)
<Fiora>
PS Now also has 4 or so of the more recent games
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<egg>
I have no consoles, so I guess that would leave me with sophie & firis
<Fiora>
ps now runs on PC too, but yeah
<Fiora>
ps3s are pretty cheap nowadays though!
<Fiora>
and have enough good exclusives to be worth it
<Fiora>
and, well, 5 of the PS3 atelier games *do* apparently now work (with some bugs) on RPCS3....
<Fiora>
at full speed
<Fiora>
anyways atelier sophie is a game about a budding young alchemist who meets a jaded old sentient book that sasses her.
<egg>
Fiora: "have enough good exclusives to be worth it", tbh in the past year or two I haven't played much of anything except the occasional bit of KSP or KSP+RSS (not counting when I'm just starting KSP to test principia), so that's not much of a factor :-p
<Fiora>
see, I just have to get you playing some of the wonderful RPGs on the PS3 :P
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<Technicalfool>
how did a photo of a shark bite turn into an argument about glide ratios?
<Iskierka>
"Most shark bites are within 100 feet of land ... because that's where the people are." "Most plane crashes are on the ground" -> stuff about how planes might crash
<Technicalfool>
and unless it's certain specific types of fighter planes that have about the glide ratio of a brick, the downvoted guy there is right :P
<Iskierka>
Even bad fighters are usually around 6-8, and that would be me
<Technicalfool>
as I recall, the procedure for engine failure in an F15 is "eject".
<Technicalfool>
(though I only know that second-hand from a USAF mechanic)
<Technicalfool>
I do like the description of an aircraft with a 1:3 glide ratio though. One that's in about 20 seperate pieces.
<Iskierka>
I suspect the F-15 should glide reasonably but it may be that it has insufficient provisions for the power loss. The controls certainly look like they'd be heavy and totally useless without hydraulics
<Iskierka>
Apparently an F-16 has done dead-stick though, but single-engine may have put in some provisions for it
<Technicalfool>
I'm reminded of those pictures of a fighter jet demonstrating succintly the "anything will fly if you throw it hard enough" principle by landing with one wing.
<Iskierka>
That was in fact an F-15, though had full engine functionality
<Technicalfool>
indeedy. Lots of thrust, plus I guess body lift.
<Technicalfool>
those things are pretty much billion-dollar lawn darts anyway. Point nose in desired direction, engage throttle.
<Iskierka>
amusingly on the L/D, even the apollo CM did slightly more than 1/3 during reentry
<Technicalfool>
pfheh
<Iskierka>
might've even been half during below-hypersonic ballistic phase
<Iskierka>
so a literal brick can do more than this guy thinks
<Technicalfool>
this shall have to be tested. Who's volunteering to attach control surfaces and servos to a housebrick?
<bofh>
Iskierka: are we talking about orbital insertion of teapots?
<Iskierka>
we might have been earlier
<bofh>
also 1:14 seems a bit high for a brick
<bofh>
I mean I'm pretty sure that's better than a 777, which while having an infamously crappy glide ratio, still shouldn't be higher than that of a brick
<bofh>
Oh no that one was 1:17
<bofh>
nevermind
<bofh>
also rofl I suspect that if one attached control surfaces to a brick they'd be able to get > 1:17 from it.
<egg|zzz|egg>
!wpn bofh
* Qboid
gives bofh an Artinian git-rebase
<egg|zzz|egg>
bofh: the orbital teapot question seems interesting though
<bofh>
Getting a cubesat into a solar orbit sounds slightly tricky.
<bofh>
At least one >1au out
<egg|zzz|egg>
bofh: well, you'd probably have to gravity assist yourself with badgers somehow?
<bofh>
Yes, but where would one find an orbiting badger?
<egg|zzz|egg>
bofh: so I guess you could eject yourself with the Moon without too much difficulty, then you'd have to assist yourself with the Earth repeatedly?
<Iskierka>
bofh, 747 is 17:1
<Iskierka>
other way around
<bofh>
Iskierka: ohh, I see. okay, so that brick value now makes much more sense.
<Iskierka>
it does, though I'm pretty sure you could do better with control
<bofh>
Oh, I'm still pretty certain you could get it down to below 1:10 or so.
<Iskierka>
1:14 might even be just the average distance it tends to travel due to wind and tumble
<bofh>
True. And yeah, an uncontrolled brick would likely tumble a bunch.
<bofh>
egg|zzz|egg: wouldn't a single moon ejection work? then just do a Mars grav assist.
<bofh>
I guess it ultimately boils down to how much hydrazine our teapot has.
<egg|zzz|egg>
bofh: so yes, if you can get enough from the moon to lob you to Mars
<egg|zzz|egg>
bofh: to lob you to Mars *in a trajectory that allows for cheap enough capture* of course
<bofh>
Point. I don't *think* that's possible without first doing an earth grav assist or 5, yeah.
* egg|zzz|egg
stares at rvalue references, parameter packs, and std::forward
<bofh>
having fun there?
<egg|zzz|egg>
bofh: :-p
<egg|zzz|egg>
bofh: so plenty of things in the principia libs that were solving quadratic equations or doing things that depended on quadratic equations returned a vector of solutions
<egg|zzz|egg>
bofh: we made a BoundedArray (an std::array with a size), which ~doubled performance in the code we were poking at (because mallocing all those arrays is silly)
<egg|zzz|egg>
bofh: now I'm writing a constructor so you can say return {solution1, solution2} or return {} rather than return {{solution1, solution2}, 2}
<egg|zzz|egg>
or return {{}, 0} :-p
<egg|zzz|egg>
bofh: it's fairly straightforward, it's just that the construct where you take an Args&&... args and initialize the array with {std::forward<Args>(args)...} is infinitely confusing
<egg|zzz|egg>
aarghs
<APlayer>
How does one calculate the closest approach between two objects orbiting the same body, as shown in KSP's map view?
<egg|zzz|egg>
bofh: and now it all happily happens on the stack instead of allocating a container for two solutions
<egg|zzz|egg>
bofh: will afknomz, you might want to take APlayer's question and tell tales of root finding :D
<APlayer>
You guys don't have to "handle" me as if you were a support center. ;-) If you need to eat or whatever, just do so, I can wait. :-)
<egg|zzz|egg>
APlayer: but we're in different timezones so bofh might not be eating, and bofh likes numerics too :D
<bofh>
heh. I do have more meetings to run to in 10 mins tho, but will be around in an hour. Will try to get some fun stories in first tho.
<APlayer>
Just highlight me whenever you can adn want to answer. I'll be around for at least the next hour.
<APlayer>
And if I'm gone, just ;tell me.
<egg|zzz|egg>
or !tell
* egg|zzz|egg
pets the redundant bots
<APlayer>
We're aerospace interested people, and redundancy is essential in aerospace. :P
<egg|zzz|egg>
!wpn котя
* Qboid
gives котя a floating point dodecahedron
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<kmath>
<FioraAeterna> like my Atelier cosplay? not a girl? regular reminder that atelier has Many Extremely Good Boys and you should cosp… https://t.co/arvlapwLPu
<soundnfury>
!wpn Sarbian
* Qboid
gives Sarbian a neon egg
* egg|zzz|egg
fluoresces at Sarbian
<Fiora>
solle is extremely good. 80% of his role in the game is to sass you
<Iskierka>
Technicalfool, the stupid person got stupider
<egg|zzz|egg>
so uh, the shirt I'm wearing right now seems a bit similar to his amusingly
<Sarbian>
I really should have a look at the Atelier games one of those days. It s one of the JRPG franchise I never tried
<soundnfury>
hmm. Why does every twitter page redirect me to their mobile site?
* soundnfury
looks under the desk at tower PC
<Fiora>
he's eternally disappointed that you aren't completing your quests, aren't filing your paperwork on time, and no, you can't have his sweets. he made them. not for you.
<soundnfury>
nope, definitely still not a 'phone…
<Sarbian>
soundnfury: you have a strange browser id ?
<egg|zzz|egg>
soundnfury: it's only a phone when you're not looking under the desk
<soundnfury>
Sarbian: I don't think so. It even reports as firefox now rather than iceweasel
<soundnfury>
egg|zzz|egg: nah, that'd be if I were using a quantum computer shirley?
<BPlayer>
soundnfury: What's your screen resolution?
<soundnfury>
BPlayer: 1680x1050
<soundnfury>
(and yes, 1050 is TRWTF.)
<BPlayer>
Either that's a twitter thing, or your browser thinks it is a handheld media. I have no other explanation.
<BPlayer>
Oh well. I've got to go now. See you tomorrow!
<Qboid>
U+0522 CYRILLIC CAPITAL LETTER EN WITH MIDDLE HOOK (Ԣ)
<Sarbian>
So it s a photo about a shark bite and the comments are about gliding distances. Ok, fine.
<egg|zzz|egg>
Sarbian: are about gliding *and* full of daftness
<Iskierka>
"Most shark bites are within 100 feet of land ... because that's where the people are." "Most plane crashes are on the ground" -> stuff about how planes might crash
<Iskierka>
including this trump-without-money thinking that planes just magically fall out of the sky if their engines stop
<Iskierka>
like wtf do you think those wings are doing. If the engines were holding it up they'd be pointing up
<Sarbian>
Iskierka: Or on towers.
<Iskierka>
it does say most. Some happen in the air
<Sarbian>
I am just make sure you are 100% precise ;)
<Sarbian>
err, that was not English. Sry
<Sarbian>
I am just making sure ...
<Fiora>
aren't *all* plane crashes on the ground? or ocean, i suppose
<Fiora>
like, a crash requires the ground
<Iskierka>
unless two crash into each other
<Fiora>
good point. that's.... terribly rare though
<Iskierka>
Has happened, though
<UmbralRaptor>
Just don't crash into the skybox.
<Fiora>
plus, the ground eventually interposes a short while later.
<UmbralRaptor>
Or more seriously, a building? >_>
<Fiora>
buildings are extensions of the ground!
<Fiora>
this all boils down to the classic theory of flight: throw yourself at the ground and miss
<Iskierka>
some flights have crashed on the moon then
<kmath>
<bcrypt> for those claiming this isn't possible: a key point of his talk was that it will be soon as a result of the cancer… https://t.co/NeQxyBP76m
<SnoopJeDi>
err, should have linked top of thread I guess, but gist is "targeted treatments open up a lot of threat surface area for human genome"
<Qboid>
[#374] title: $ are not allowed in filename of a filegroup | Ultimately any character can be part of a filename. We should probably allow that.... | https://github.com/bazelbuild/bazel/issues/374
<UmbralRaptor>
!acr -add:eROSITA extended ROentgen Survey with an Imaging Telescope Array
<Qboid>
UmbralRaptor: I added the explanation for this acronym.
<egg|zzz|egg>
UmbralRaptor: also, I made myself a cyrillic layout so I can type the names of Чебышёв, котя, and эта хуйня :-p
<UmbralRaptor>
(That one's the fault of a Max Planck institute, not NASA)
<egg|zzz|egg>
MPE?
<UmbralRaptor>
Yay
<egg|zzz|egg>
!seen teabot
<Qboid>
egg|zzz|egg: I haven't seen the user teabot yet.
<egg|zzz|egg>
Iskierka: btw, чебышёв will fix the history plotting performance horror, see the last comment on #1487
<Qboid>
[#1487] title: Terrible framerate in map view | I am running an RP-0/RO save with principia, and upon entering orbit where my trajectories are displayed, the framerate drops to nearly unplayable levels. Is there a fix?... | https://github.com/mockingbirdnest/principia/issues/1487
<Iskierka>
woo
<SnoopJeDi>
ffs, put doc pull request into scipy, had to clean up language/typo due to request....and then the person says "this is a bug anyway let's keep the issue open"
<SnoopJeDi>
WHY DID YOU ASK FOR CHANGES THEN
<SnoopJeDi>
...nevermind, it was merged AND kept open I'm an idiot
<egg|zzz|egg>
bofh: that book by Encke still uses ☊ for the longitude of the ascending node, rather than the modern Ω
<egg|zzz|egg>
bofh: sadly ☊ is not a legal identifier in C++ :-\
<Sarbian>
Cherry ? ;)
<egg|zzz|egg>
!u ☊
<Qboid>
U+260A ASCENDING NODE (☊)
<egg|zzz|egg>
:D
<Sarbian>
Still a cherry
<bofh>
Damn. That would be outright convenient.
<SnoopJeDi>
Perhaps there's a solution: use ? :P
<UmbralRaptor>
Sarbian: head of the dragon.
<egg|zzz|egg>
Sarbian: the modern Ω is used because it resembles ☊
<egg|zzz|egg>
UmbralRaptor: headphones of the dragon
<egg|zzz|egg>
SnoopJeDi: bofh: so the daft thing is, ? is allowed in an identifer
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<egg|zzz|egg>
identifier even
* egg|zzz|egg
pokes WG 21 with a pointed stick
<SnoopJeDi>
daft, yes. surprising... ¯\_(ツ)_/¯
<soundnfury>
egg|zzz|egg: is an identifer an identifier for an aquifer?
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<UmbralRaptor>
Is ¯\_(ツ)_/¯ a valid identifier?
<SnoopJeDi>
\ might be problematic?
<SnoopJeDi>
and () actually
<egg|zzz|egg>
UmbralRaptor: of course not, that would be silly. ¯＼_（ツ）_／¯ is, though.
<soundnfury>
SnoopJeDi: I'm sure we can find some mathematical brack- dammit ninjas
<SnoopJeDi>
!wpn soundnfury
* Qboid
gives soundnfury an irrelevant lobster-like 2N3906
<SnoopJeDi>
(I'm in the midst of a very slow MGSV playthrough right now)
<SnoopJeDi>
bofh, this pleases me
<egg|zzz|egg>
I feel like UmbralRaptor should jump in with some astrophysics-based metal gear jokes
<SnoopJeDi>
unlike the Cell article I was reading, which was biochemically kinda cool but of course popsci ran with "if rats can't smell they don't get fat because metabolism"
<SnoopJeDi>
which to be clear has some cool stuff in it, but from a quick skim it seems like they're shooting from the hip as far as the weight difference is concerned (see fig 5A)
<SnoopJeDi>
like those two trends are almost in lockstep for comparable intake which says to me that the vertical separation is an anomaly (particularly for N<20)
<SnoopJeDi>
also see fig 3C which has an impressively large errorbar for activity lol
<SnoopJeDi>
definitely still a good paper but not one you can draw super useful generalizations about weight control from. so naturally this is EXACTLY what coverage did
<SnoopJeDi>
(converts make the best zealots, weight control science is the hill I will die on)
<UmbralRaptor>
???
<SnoopJeDi>
!u ???
<Qboid>
U+1F5E1 DAGGER KNIFE (?)
<Qboid>
U+1F5E1 DAGGER KNIFE (?)
<Qboid>
U+1F5E1 DAGGER KNIFE (?)
<SnoopJeDi>
I concur.
<FluffyFoxeh>
lol
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<bofh>
rofl
Snoozee is now known as Majiir
<Majiir>
!wpn egg|zzz|egg
* Qboid
gives egg|zzz|egg a descriptive gazebo
<Majiir>
!wpn
* Qboid
gives Majiir an iron
* egg|zzz|egg
stares at the gazebo
<Majiir>
Describe it!
<egg|zzz|egg>
Majiir: it's a descriptive gazebo; it describes *you*
<Iskierka>
the geometry of the gazebo describes the entire state of the universe
<egg|zzz|egg>
UmbralRaptor: is the gazebo flat
<UmbralRaptor>
The Friedman Gazebo
<UmbralRaptor>
Given inflation, perhaps the gazebo is actually a bouncy castle.
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<Ellied>
Work I do at school: Designing and building a new low-cost counter board for Raspberry Pi-based science.
<Ellied>
Work I do at Argonne: Putting a resistor in a box.
<SnoopJeDi>
Sounds like national labs yep
<Ellied>
Someone got bitten by a capacitor and then a 300-volt battery (the same person? who knows) yesterday ish, so electrical safety has been incredibly tight.
<SnoopJeDi>
lmao "bitten by a capacitor" is brilliant
<egg|zzz|egg>
*chomp*
<Ellied>
*SNAP*
<Ellied>
They're getting all on our case because our experiment involves an 11-volt bias on a semiconductor junction
<Ellied>
they had a complete shutdown of electrical work because of that, so the APS didn't shut down today like it was scheduled to in a rare move to make up for lost time, and we couldn't start setting up our experiment.
<SnoopJeDi>
Yea, it's frustrating when the safety stuff gets in the way of experiments, because you know you don't really want it any other way
<SnoopJeDi>
but...time is precious at a facility :/
<Ellied>
my prof and our beamline scientist had a conversation that was directly from an SCP article too
<SnoopJeDi>
didn't realize you were doing APS stuff though Ellied that's neato
<SnoopJeDi>
(I know almost nothing about APS as a machine)
<Ellied>
"One of the laser chillers has been causing trouble." "oh?" "Yeah, keeps oscillating a little, and there's this black gunk that collects in the tubes. I don't know what it is, but we have to clean it out every time we shut down to make sure it doesn't get clogged. Since there's no shutdown today like was originally planned, it might start to act up, so keep an eye on it." "Okay."
<SnoopJeDi>
O_O
<Ellied>
like, oh hi, didn't now the APS was part of SCP-1730