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.
<bofh>
I'unno I def. mentally categorize you as cat of all trades (but mostly cosplay & floating-point/compilers I think)
<SnoopJeDi>
bofh, heh, that thing you RT'd about the equifax is someone I sorta-know. The streams, they are crossing. (as if they hadn't many moons ago I suppose)
<UmbralRaptor>
TIL cilantro hummus is a thing >_<
<SnoopJeDi>
I'm rather fond of Panera's cilantro-lime hummus on their veggie sammich
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<UmbralRaptor>
…
<SnoopJeDi>
d-does that make me basic?
<UmbralRaptor>
Is that more like Dial, Irish Spring, Lever 2000, Dove, or something else?
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<SnoopJeDi>
HAH, I'd not even thought of that meaning of "basic"
<UmbralRaptor>
I mean, the pun is semi-intended, but not the main thrust of my complaint.
<SnoopJeDi>
my main complaint about cilantro is that it feels wasteful to not use it all if I buy a bunch
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<kmath>
<bofh453> Current mood: <@Newpa_Hasai> Is 2017 the series finale or something? <@jgerity> If it's not we're definitely poised mid-air over the shark.
<SnoopJeDi>
boy, I should probably learn some formal graph theory.
<SnoopJeDi>
omg "little group" is the most adorable term and I've never heard it before
<Ellied>
activity for the past hour: staring at windy.com with a blank expression on my face, occasionally attempting to eat food
<SnoopJeDi>
are you in FL Ellied?
<Ellied>
Thankfully no
<SnoopJeDi>
phew
<SnoopJeDi>
I have some family there and I'm a bit alarmed by how blasé my sister is being, but I suppose worry doesn't really help much
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<Ellied>
I have relatives with a house there, but it currently stands empty because the family has largely moved its operational base to Grand Rapids in anticipation of just this sort of thing
<Ellied>
Not sure if it's going to be standing much longer, we'll see.
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<Ellied>
the GFS puts the eye wall of Irma directly on top of Miami on Sunday afternoon, with winds at the city center of 340 mi/hr. I *really* hope that doesn't come to pass.
<UmbralRaptor>
Wait, 340 *miles per hour*?
<Ellied>
I think I'm reading that right?
<Ellied>
wait no
<UmbralRaptor>
kph?
<Ellied>
I'm silly but I partially blame this map for not putting a unit there
<UmbralRaptor>
Because 340 mph would be something like 1.4x the record.
<Ellied>
I don't know what that number is but the one next to it is 55kt
<Ellied>
!wa 55kt in m/s
<Qboid>
Ellied: convert 55 knots to meters per second: 28.29 m/s (meters per second)
<UmbralRaptor>
!wa 55 kt in ft/s
<Qboid>
UmbralRaptor: convert 55 knots to feet per second: 92.83 ft/s (feet per second)
<UmbralRaptor>
!wa 55 kt in kph
<Qboid>
UmbralRaptor: convert 55 knots to kilometers per hour: 101.9 km/h (kilometers per hour)
<UmbralRaptor>
!wa 55 kt in furlongs per fortnight
<Qboid>
UmbralRaptor: convert 55 knots to furlongs per fortnight: 170131 furlongs per fortnight
<Ellied>
ECMWF puts it at 57kt
<Ellied>
!wa 75 kt in m/s
<Qboid>
Ellied: convert 75 knots to meters per second: 38.58 m/s (meters per second)
<Ellied>
so uh, what dynamic pressure do skyscrapers stand up to?
<UmbralRaptor>
Not sure.
<bofh>
340mi/hr would beat the all-time *earth* record for cyclonic sustained winds by a wide margin. OTOH for gusts that's in the realm of plausible.
<Ellied>
yeah I think that number is actually the direction in degrees or something
<Ellied>
I don't usually into weather this much tbh
<UmbralRaptor>
I'd randomly guess 5 psi, but IANACivil Engineer.
<SnoopJeDi>
I hope more engagement in weather and climate science is a silver lining for this season
<SnoopJeDi>
because the fluency gap even for highly-trained scientists is...shocking.
<Ellied>
!wa 5 psi in Pa
<Qboid>
Ellied: convert 5 psi (pounds-force per square inch) to pascals: 34474 Pa (pascals)
<SnoopJeDi>
An even less helpful unit!
<Ellied>
!wa density of air at sea level
<Qboid>
Ellied: air | density | standard conditions | (sea level): 1.225 kg/m^3 (kilograms per cubic meter)
<kmath>
<jmnese> This is what it looks like when the eye of a Cat-5 passes over and the atmosphere loses ~10% of its weight - from t… https://t.co/AWQho4cWaT
<Ellied>
okay, so 5psi dynamic pressure at sea level is about 237 m/s wind. I think we're not going to see that in this hurricane, mercifully.
<Ellied>
hrm, does the average density of air gain anything meaningful by including the mass of the rain in it during a hurricane?
<kmath>
<CondensedPapers> Recombination of radiation defects in solid methane - neutron sources and cryo-volcanism on celestial bodies. https://t.co/gLlrhwYRfh
<SnoopJeDi>
jfc that plot
<SnoopJeDi>
not that I have any intuition for mmhg but jeez
<SnoopJeDi>
err, inches hg I guess
<bofh>
like it's more obvious in hPa
<bofh>
101.3 -> 91.7 (iirc) and back
<bofh>
kind of makes the 10% figure obvious instead of completely out of left field, too.
<SnoopJeDi>
yea
<SnoopJeDi>
It's gonna be a weird decade.
<SnoopJeDi>
(or more?)
<SnoopJeDi>
But I guess c'est la vie
<bofh>
"I'll take climate change for $500, Alex!"
<SnoopJeDi>
for a bit of comic relief: chemtrail lady also asked if hurricanes "move slower" nowadays because of climate change
<kmath>
<CanberraDSN> If you're coming out to see us any time, you can always ask the locals for directions. ??? #spacemenagerie… https://t.co/b64YeVDI9H
<SnoopJeDi>
I suggested that perhaps because our forecasting ability has gotten so much better, maybe it just feels like we get more advance notice, heh.
<bofh>
SnoopJeDi: that's actually by far the most likely answer
<SnoopJeDi>
It's hard to sort out how much of the question was legitimate and how much was nutter
<bofh>
man, the GOES-16 data for Harvey/Irma is nothing short of amazing in every way
<UmbralRaptor>
AANBO? ANABO?
<SnoopJeDi>
Although the guest oceanographer was very patient with my "this isn't my science-house I'm gonna put my feet on EVERYTHING" questions
<SnoopJeDi>
Most of the attendees were more the speed of "why is ice melt such a big deal sea level only rises a few mm lmao"
<SnoopJeDi>
but much much more benign and polite ofc
<bofh>
because fucking with salinity is very bad of you depend on oceanic currents for your region of the world to not freeze over, for starters.
<bofh>
if*
<SnoopJeDi>
albedo will getcha too
<SnoopJeDi>
("al-whatoh?")
<UmbralRaptor>
"Reduced temperature gradients mess with the jet stream, and seem to give more droughts and floods"
<bofh>
yep
<SnoopJeDi>
But then, that's the fluency gap
<SnoopJeDi>
Most people don't even know enough basic science to talk about something like the global energy balance. They can probably intuitively grasp it very quickly if you walk them through it, but they couldn't build it out of their own mental toolkit
<SnoopJeDi>
don't even know how to begin having the conversation, let alone have it intelligently
<UmbralRaptor>
This is one of those gaps that is literally incomprehensible to me because I watched lots of science documentaries, read Discover, etc as a kid,
<bofh>
^
<SnoopJeDi>
I feel like maybe I have more perspective on it than my peers because I used to be into conspiracy stuff because I thought it was neat
<SnoopJeDi>
I'm not sure I believed in any of it too deeply, but...it was fun!
<SnoopJeDi>
(and also I'm not terribly clever wrt peers hah)
<SnoopJeDi>
But even for really pretty sharp folks, a lot of them can't have much of a conversation past "well...carbon dioxide, you see!"
<SnoopJeDi>
At least in my personal experience
<UmbralRaptor>
Eh, that makes sense. My mother is into a lot of UFO type stuff for the entertainment.
<SnoopJeDi>
Certainly almost all of them would pick CO2 over H2O as a greenhouse gas
<Ellied>
does... does this paper cite /youtube comments/ on its first page
<Ellied>
what the actual fuck
<UmbralRaptor>
Ariχiv papers get *fun* on April 1st.
<SnoopJeDi>
More fun than Nomal \o/
<bofh>
rofl
<UmbralRaptor>
Other papers include spacetime distortion around Cthulhu's island, and necrobiological signatures from planets that underwent zombie apocalypses.
<Ellied>
disabling kwin's compositor *really* helps the overall speed of things in KDE
<Ellied>
replacing it with a lightweight like Compton provides some basic shadows to keep windows from running together
<bofh>
UmbralRaptor: LOL
<Ellied>
UmbralRaptor: I'm glad that first one was a joke but it couldn't have hurt to like, say it somewhere
<kmath>
<whitequark> One morning, when Gregor Samsa woke from uneasy dreams, he found all his code transformed in his source code repository into C++98.
<egg|zzz|egg>
is it C++98 with German identifiers though
<egg|zzz|egg>
whitequark: does the codebase have a rotten apple embedded in it
<egg|zzz|egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a metabotropic repeater
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<egg|zzz|egg>
!wpn Ellied
* Qboid
gives Ellied a cosmological Giger set
<egg|zzz|egg>
!wpn Iskierka
* Qboid
gives Iskierka a backward category
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<soundnfury>
!wpn egg|zzz|egg
* Qboid
gives egg|zzz|egg a neodymium cannon-like detector
<egg|zzz|egg>
bofh: silly C++ standard pedantry question: does memcpying into a union member make it the active member?
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<soundnfury>
egg|zzz|egg: don't know for sure about C++ but in C, while there's no phrase "active member" in the standard, the relevant footnote talks about "the member last used to store a value in the object"
<soundnfury>
and since memcpying is basically casting a pointer to (char *) and writing through it, that's storing a value
<soundnfury>
(it's always legal to access the object representation through a char *, thanks to §6.2.6.1)
<egg|zzz|egg>
soundnfury: yeah, but in C since C99 you can use unions to type pun anyway right?
<Iskierka>
egg, from kspo: if you have a single-impulse ascent from an airless body at 45 degrees, can it have a closed orbit that intersects the antipode of its starting point?
<Iskierka>
(my thought is that from symmetry it must be on an escape trajectory but don't trust my knowledge completely)
<Iskierka>
Question comes from what the optimal angle for hopping is, which is probably distance-dependent and doesn't remain at 45 degrees as on a flat plane
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<UmbralRaptor>
Iskierka: I'd guess yes (
<UmbralRaptor>
er
<UmbralRaptor>
yes in some cases, but would be very unsure in others.
<UmbralRaptor>
Also, 45 degrees smoothly dropping to 0 as distance approaches the circumference, I think?
<Iskierka>
I did later adjust to it might work with a VERY elliptical orbit so it's definitely not the optimal
<Iskierka>
Probably, but it's also probably not linear
<APlayer>
Hi, guys! I may have an interesting problem. Consider that you have two finite sets of nine numbers, each of the numbers can be an integer between 1 and 9 inclusive and sorted in ascending order. Now prove, or disprove, that no two sets exist that have a similar sum and product of all the numbers.
<APlayer>
Is this even possible?
<UmbralRaptor>
similar?
<Iskierka>
3^9 and 9^3*1^6 have same product for first easy case
<APlayer>
(Not) equal
<APlayer>
But different sums
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<APlayer>
What I need this for is basically a weird proramming hack in a weird language. I need to find out whether the set of nine numbers has all the numbers from 1 to 9 (the order does not matter) and so I compute a "checksum" using the sum and product
<APlayer>
And I wanted to know if there is a possibility that my checksum is flawed.
<APlayer>
But it is an interesting problem in itself and I don't even know how to approach it
<Iskierka>
not a formal proof but from the base set of 9 1s, the smallest sets that match multiplication (the more restrictive case) are 1^7*2^2 and 1^8*4. These have dissimilar sums as multiplying two numbers by two increases the value only by two, but one number twice by three
<Iskierka>
the same basic case of <n> numbers by <n> or one number by <n> times holds for all similar sets by multiplication and I doubt the sum increase can be matched
<UmbralRaptor>
So, 9 numbers that sum to 45 and multiply to 9!?
* UmbralRaptor
pokes punctuation with a factorial.
<APlayer>
I actually interpreted that as a factorial and it confused me
<APlayer>
Now it makes more sense :P
<APlayer>
Iskierka: That's pretty cool. I've got to learn such stuff
<APlayer>
Thanks!
<Iskierka>
the only base sets my brain is going to that you can make match would be a matched set of numbers as well
<APlayer>
Interesting, so, if the order does not matter, any set of data can be represented uniquely using only its total sum and products?
<Iskierka>
UmbralRaptor, don't know the equation for optimal angle but we came to the maximal area that an angle can reach given a curved universe returning to initial point and infinite velocity: http://flockdraw.com/63s2rs
<Iskierka>
an area 180-2*angle is inaccessible no matter how fast or how much nonsense your escape trajectory has
<UmbralRaptor>
o_O
<UmbralRaptor>
Please do not alter the universe's curvature.
<UmbralRaptor>
<_<
<Iskierka>
can you simplify the problem to the minimum-sized orbit that will intersect the desired point?
<Iskierka>
don't know how you get angle from that buut ...
<Iskierka>
or how to determine orbit intersects with sphere on a distance basis :D
<UmbralRaptor>
Maybe.
* UmbralRaptor
? the Kepler equation.
<bofh>
rofl
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<Iskierka>
google results for orbit intersects are largely doing first-principles on stuff like "minimum eccentricity to intersect"
<Iskierka>
rather than the general equation of "what are the two intersect points for these orbits"
* UmbralRaptor
strongly suspects that it requires a numeric solution in most cases.
<kmath>
<matthew_d_green> I'm not worried about this Equifax thing. I changed my SSN after the OPM hack, and now it has a letter and a special character.
<Iskierka>
I'm not sure of that because we only need the lateral displacement of the orbit at same height. We only need the Ap and Pe
<Iskierka>
it may be a numeric solution to solve the minimum value but a fairly easy one. There should be equations determining that displacement, surely?
<Iskierka>
actually I wonder if there's better solutions for the intersection of an ellipse and circle. We can then turn that ellipse into Ap+Pe ...
<bofh>
good news: Irma's weakened to category 4
<bofh>
bad news: Jose's strengthened to category 4
<bofh>
REALLY FUCKING BAD NEWS: Irma weakening was due to an eyewall replacement cycle. Likely to strengthen back up to category 5 with a much larger eye.
<kmath>
<Geo_GIF> GPS data show #Harveyflood was so large it flexed Earth's crust, pushing #Houston down by ~2 cm! #EarthScience… https://t.co/ubODJWzsP2
<Iskierka>
yeah I can't figure out how to make that solution :D
<Iskierka>
but it's definitely possible, the equation just gets too big
<Iskierka>
unless it turns out to be easier to go the other way, determine the two solutions from the distance, and fit the ellipse to it ...
<Iskierka>
this might work better, yes
<Iskierka>
WOLFRAM. I DON'T WANT YOU TO SOLVE THE ANGLE. I KNOW THAT. SOLVE THE a/b!
<Iskierka>
yeah this needs a numeric solution but it's a compact-enough equation
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* egg|zzz|egg
reads backlog
<egg|zzz|egg>
whitequark: isn't tungsten just Wolfram? (in de at least)
<kmath>
<skdh> Astrophysics taught me burnout is only the beginning. It's followed by an explosion, or total collapse, or turns you to a cold, hard remnant
<egg|zzz|egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a ham ТП-82
<egg|zzz|egg>
!u ᾰν
<Qboid>
U+1FB0 GREEK SMALL LETTER ALPHA WITH VRACHY (ᾰ)
<Qboid>
U+03BD GREEK SMALL LETTER NU (ν)
<egg|zzz|egg>
yeah, no need for that crap, χαρακτήρ παντοκράτωρ
<SnoopJeDi>
bofh, holy shit
<bofh>
UmbralRaptor: accurate
<egg|zzz|egg>
!wpn bofh
* Qboid
gives bofh a quintic resistor
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<egg|zzz|egg>
!wpn
* Qboid
gives egg|zzz|egg an asymmetric δ-function
<egg|zzz|egg>
!wpn Iskierka
* Qboid
gives Iskierka a sarcastic king
<SnoopJeDi>
!wpn -add:wpn snuggle
<Qboid>
SnoopJeDi: Weapon added!
<egg|zzz|egg>
!wpn -add:adj thoracic
<Qboid>
egg|zzz|egg: Adjective added!
* UmbralRaptor
introduces a fellow student to catterplot.
<egg|zzz|egg>
clearly you should call it the theorem of the constables
<soundnfury>
or maybe we should be _less_ silly than the French
<soundnfury>
(it's not much of a challenge, I know)
<soundnfury>
right, all this computer repair has made me hungry, time to get some dinner
<soundnfury>
biab
<egg|zzz|egg>
the word "constable" sounds eggstremely weird if you read it in french (insert a space between the n and the s and you have two french words, the first being a word that's etymologically cognate to cunt but semantically closer to idiot)
<egg|zzz|egg>
(and the adjective "stable" is placed correctly to qualify it)
<kmath>
<KeraunosObs> Pour mettre en perspective les dimensions actuelles de l'ouragan #Irma, qui a grossi ces dernières 24h. #Antilles https://t.co/hNHYPTK9VL
<soundnfury>
egg|zzz|egg: no, it's clearly a programming term: const-able.
<kmath>
<rayna0758> @RyanMaue @whec_rcaniglia At 392 miles long and 405 miles wide yes it is Stay Safe https://t.co/XnktTeLZdP
<bofh>
egg|zzz|egg: HOLY FUCK
<egg|zzz|egg>
I mean the pyrenees, côte d'azur, and most of brittany are ok :-p
<whitequark>
bofh: holy shit
<egg|zzz|egg>
bofh: I mean that's vaguely the same thing as saying it's as big as Texas, it's just that Texas is big (and I have a better idea of the size of France)
<egg|zzz|egg>
france is more circular too, so that matches the shape of the hurricane nicely
<bofh>
egg|zzz|egg: yeah, and same (well it's more it's still hard for me to have the intuition that Texas is the size of large European countries even though it totally is)
<bofh>
and yeah.
<egg|zzz|egg>
bofh: could also drop it on the iberic peninsula
<bofh>
no matter how you slice it, it's a huge cyclone
<kmath>
<NWSKeyWest> ***THIS IS AS REAL AS IT GETS******NOWHERE IN THE FLORIDA KEYS WILL BE SAFE*** ***YOU STILL HAVE TIME TO EVACUAT… https://t.co/5AnaYguVaG
<egg|zzz|egg>
bofh: yeah, but e.g. in FR no matter what it's for you just get a prescription, and go to the pharmacy with that; here it's *opens cabinet* *hands you a box*
<bofh>
ahh, weird, I'm used to the FR system
<egg|zzz|egg>
bofh: or even *opens cabinet* *cuts a blister pack to the right size for what he prescribed* *hands you that*
<egg|zzz|egg>
bofh: also TIL that povidone-iodine is an antiseptic that works against fungi and viruses, which sounds like magic
<bofh>
huh, interesting.
<bofh>
honestly not hugely surprised about fungi, but it working against viruses is neat.
<egg|zzz|egg>
bofh: dunno, fungi are tough
<egg|zzz|egg>
(but yes, viruses more so)
<egg|zzz|egg>
bofh: huh, sci-hub seems to just ask for another captcha when I've filled one? Ꙩ_ꙩ
<kmath>
<mnxmnkmnd> @whitequark i honestly didn't Get NWS panic until i went through a tornado and learned about the emergency messages… https://t.co/wpFmUUF5AS
* UmbralRaptor
assumed that tzetze is from Russia, but all of their volcanoes are on subduction zones…
* egg|zzz|egg
is confused by tzetze's bio
<UmbralRaptor>
They're weird.
<egg|zzz|egg>
yes the bio on the synapsid website is also unsettling
<egg|zzz|egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a long cotter pin
* UmbralRaptor
pokes things?
<UmbralRaptor>
So, TIL that you can do really nifty climate modeling with a few differential equations.
<UmbralRaptor>
Also, a mathematician will call 255 K close to 288 K.
<kmath>
<worddroppings> Remember kids, medical bills are more expensive when you don't have insurance. ER visit cost billed to insurance: $6800 Amount paid: $3800