egg|nomz|egg 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> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer.
<bofh>
Like I figured. Again, very familiar with this, since I did similar stuff for spherical harmonics awhile back (and then again for Laguerre Polynomials more recently).
<bofh>
:P
<egg>
bofh: it's quite nice that in the end the coefficients are just (sign) (n+k|2)^k̲ / k!
<egg>
also a division by a power of 2 that phl dropped in the last step I suppose?
<bofh>
So I think that division gets cancelled out with a factor of the same power of two you get from converting Gamma(n+1/2) -> (2k-1)!!
pthag has quit [Ping timeout: 183 seconds]
<bofh>
let me write this down
<egg>
bofh: there is no Γ in the penultimate eggspression
<egg>
bofh: aaaah there's a leading 2^n in the Wikipedia formula
<bofh>
egg: yes but there is a 1/2^n in the penultimate eggspression that is the one I'm referring to and there's a leading 2^n in the initial expression
<egg>
yeah I forgot that 2^n in the initial eggspression
<egg>
so yeah, it's just (n+k|2)^k̲ / k! * sign
<bofh>
Yeah that matches what I remember.
Iskierka has quit [Ping timeout: 183 seconds]
<bofh>
oh nice I found my pictures from that museum of military reliefs we went to right after Arts et Métiers.
<bofh>
actually legitimately forgot we went there, rofl.
Iskierka has joined #kspacademia
<bofh>
rofl
<bofh>
"STOCKAGE DE 8 TANKS DE 1 TONNE DE CHLORE EN PHASE LIQUIDE"
<kmath>
<nuclearkatie> A song to the tune of Part of Your World (The Little Mermaid) by the amazing @anulikesstars ⏎ ⏎ Look at this nuke ⏎ Is… https://t.co/41t3oil9T2
<bofh>
egg: so I took a look at the original (as in before scaling down by 1/2) and nope, even on that the orange rectangle is blank. <shrug>
B787_300 has quit [Read error: Connection reset by peer]
<bofh>
oh are they flaring a bunch of stuff again?
<egg>
bofh: so the vapocracker didn't restart after the power issues on 22 July
<egg>
bofh: so they restarted it 22 August, and they warned that there would be a few days of noise and flaring
<egg>
and, well, from ANBO the sky was noticeably flickering in that direction :-p
<bofh>
Actually, yeah, a month makes sense for how long it takes to do maintenance & QA on one of those things (you kinda want to avoid being the next case for whatever the French CSB equivalent is :p).
<egg>
bofh: they tried restarting it on the 1st of August
<egg>
but that didn't work
* UmbralRaptor
can only think of azothothic orgies in relation to those now >_<
<egg>
!acr -add:INERIS Institut National de l'Environnement industriel et des RISques
<Qboid>
egg: I added the explanation for this acronym.
* UmbralRaptor
stares at NSF GRFP.
<UmbralRaptor>
NSF?
<UmbralRaptor>
GRFP?
<UmbralRaptor>
!acr -add:NSF National Science Foundation
<Qboid>
UmbralRaptor: I added the explanation for this acronym.
<UmbralRaptor>
!acr -add:GRFP Graduate Research Fellowship Program
<Qboid>
UmbralRaptor: I added the explanation for this acronym.
<egg>
!acr -add:BARPI Bureau d’Analyse des Risques et Pollutions Industriels
<Qboid>
egg: I added the explanation for this acronym.
<UmbralRaptor>
Tired: learning a foreign language to speak to people. Wired: learning a foreign language to watch safety videos.
<bofh>
UmbralRaptor: why not both? :P
<bofh>
(also I need more practise materials)
<egg>
!acr -add:DGPR Direction Générale de la Prévention des Risques
<Qboid>
egg: I added the explanation for this acronym.
<bofh>
I mean they prolly are the same as everywhere else? :p
<egg>
bofh: yes, but the CSB is just the CSB, it's not the BARPI (bureau of analysis of industrial risks and pollution) within the SRT (service of technological risks) of the DGPR (general direction for risk prevention) within a ministry whose name changes every few years
<egg>
bofh: and they put their reports in a database called ARIA (analysis, research, and information on accidents)
<egg>
bofh: the INERIS seems to be something unrelated
<bofh>
egg: I mean the CSB being its own thing as opposed to being something deep under the auspices of the EPA or the US State Dep't is actually very *unusual*, and also why they're so effective.
<egg>
also farm methanisation is probably the subject of a CSB video
<egg>
or five
<B787_300>
oh UmbralRaptor i will be visiting Udvar Hazy in about a month...
<egg>
bofh: yes, but it would be under the EPA or a department, here it's under one of three services of one of five general directions of a ministry, with a layer for each acronym
<egg>
an acronym for each layer, rather
<B787_300>
egg: do they have nested acrynyms?
<egg>
!acr -add:DGAC Direction Générale de l'Aviation Civile
<Qboid>
egg: I added the explanation for this acronym.
<egg>
B787_300: nah
<bofh>
I mean there seems to be more indirection in FR but weirdly it doesn't seem to result in the agencies being completely useless?
<B787_300>
awww those are more fun
<egg>
bofh: also they really like making up acronyms, see naming the database ARIA
<egg>
the CSB doesn't name the collection of its reports afaik :-p
<UmbralRaptor>
egg: Also VizieR, SIMBAD, etc?
<UmbralRaptor>
B787_300: hm. (I'm pondering poking around there tomorrow >_>)
<egg>
bofh: also there's the INERIS which seems to be completely independent from all that (although it is under the auspices of the same ministry)
<bofh>
egg: I mean ARIA is a damn good name, so,
<B787_300>
UmbralRaptor: i am just saying... i will be there on a monday because there are no late night Sun flights back to Dayton and there are none early enough so that i dont have to use a day of leave therefore i am spending the day there and visiting the Udvar
<egg>
bofh: but the INERIS has its own director general, with four directions (chronic risks, accidental risks, ground and underground (or soil and bedrock?) risks, services to entreprises and certification)
* UmbralRaptor
has literally no idea if their Mondays will be full of meetings or not. >_>
<B787_300>
UmbralRaptor: i know, but this was just the FYI... more details will come as the time apparaches
<bofh>
I like how that third one is its own department.
<bofh>
~*~ Paris ~*~
snoopsith has joined #kspacademia
<egg>
bofh: see it's very simple, the ministry has a central administration of five general directions, six audit and inspection services (including three accident investigation bureaux, but those are for transportation), a number of services and higher education institutions, and shared or unique guardianship over a plethora of institutes https://fr.wikipedia.org/wiki/Minist%C3%A8re_de_l%27%C3%89cologie_(France)#Administration_c
<egg>
entrale
<egg>
bofh: the BARPI is in one of the three services of one of those five directions, whereas the INERIS is one of the institutes
<egg>
BEA?
<egg>
!acr -add:BEA Bureau d'Enquêtes sur les Accidents
<Qboid>
egg: I added the explanation for this acronym.
<bofh>
the French seem to be less adept wrt handling large quantities of liquid Bromine than the Russians, interestingly.
snoopsith has quit [Read error: -0x7880: SSL - The peer notified us that the connection is going to be closed]
egg|zz|egg has quit [Ping timeout: 202 seconds]
<egg|cell|egg>
Why am I not sleeping
<bofh>
because RKNG :p (also what is sleep)
<UmbralRaptor>
What sort of monster designs humans to have 3 6s of uptime?
<bofh>
good question, but if you ever find out, do let me know, I wish to yell at them. A lot.
<SilverFox>
do any yall work with the communications standard of SPI?
<SilverFox>
i'm just curious if it's possible to switch the receiving modes of it such that.. the modes are to read data when pin is High, Low, Rising, Falling, so can we not set it to be rising, then during the period of high, switch modes to falling, change the data, thus doubling the effective rate of data transfer?
SnoopJeDi has quit [Quit: Leaving]
<bofh>
egg: great, now I'm reading Numerical Methods for Special Functions again.
<egg|cell|egg>
Try reading the iers conventions instead so you read something new?
<kmath>
<whitequark> i couldn't get our cat to stop walking on my laptop, but i eventually managed to nag her into not walking on the ke… https://t.co/zO2QbFD9NG
<bofh>
egg|cell|egg: well, see, I'm trying to recall what the asymptotic form of the associated Legendre polynomials was & then got distracted by confluent hypergeometric functionx >_<
<bofh>
but yeah I prolly should read IERS instead.
<whitequark>
SilverFox: sure
<whitequark>
this wouldn't be SPI though
<whitequark>
it's called "DDR"
<whitequark>
I mean the trick where you transfer data at both clock edges is called DDR
<whitequark>
the thing about SPI is that you would typically latch data at rising edge and setup data at falling edge
<whitequark>
so if you do DDR SPI, you need another clock, 180° out of phase, that you will use for setup
<whitequark>
and it's easier to just double the clock rate instead of that
<SilverFox>
right
<SilverFox>
so i basically just came up with DDR
<SilverFox>
nice
<SilverFox>
only how many decades behind?
<SilverFox>
is it possible to just multiply the number of oscillating crystals you have at like, 2Mhz frequency, and just get like, 4 of em 90 degrees out of phase and then just scale from there?
<SilverFox>
an oscillating set of oscillating crystals
<SilverFox>
and then you operate at like, 8MHz instead of just 2
<SilverFox>
how difficult is it to phase them like that
<SilverFox>
could you have quad data rate that just reads at every point of the signal? one at low, rising, high, falling ?
<SilverFox>
QDR
<SilverFox>
WE CAN GO EVEN FURTHER BEYOND
<SilverFox>
have tri-state for each four states, a 12x data rate
<SilverFox>
RAID the RAM and take it to a new level
<SilverFox>
i believe this is called dual-channel
<whitequark>
SilverFox: um
<whitequark>
what do you think DDR4 is
<whitequark>
ok it's not quite as simple
<whitequark>
SilverFox: you can't use low and high as triggers
<whitequark>
you can, though, provide more clocks that are 90° out of phase
<whitequark>
or 45° out of phase
<whitequark>
DDR4 has three clocks, CK0, CK1 and CK2
<whitequark>
I think they made it faster than DDR3 not by adding yet another clock but by increasing clock rates
<whitequark>
actually, nevermind what I said
<whitequark>
DDR RAM doesn't use
<whitequark>
*doesn't use that
<whitequark>
not sure why
egg|cell|egg has quit [Remote host closed the connection]
egg|phone|egg has joined #kspacademia
<UmbralRaptor>
What *is* a Photon? We just don't know.
<bofh>
Well, if we quantize the electromagnetic field operator in a vacuum... *jazz hands*
* UmbralRaptor
may have been amused to see the question as a chapter title
<kmath>
<whitequark> i couldn't get our cat to stop walking on my laptop, but i eventually managed to nag her into not walking on the ke… https://t.co/zO2QbFD9NG
* bofh
meows at egg & Qboid
egg is now known as egg|zzz|egg
egg|zz|egg has quit [Ping timeout: 180 seconds]
SnoopSiTh has joined #kspacademia
SnoopJeDi has quit [Ping timeout: 183 seconds]
MuseumRaptor is now known as UmbralRaptor
pthag has quit [Remote host closed the connection]