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>
egg|anbo|egg: UmbralRaptor: simple: EM DASH: U+2014 -> UTF8: 0xE2 0x80 0x94 -> treat as ISO8859-1, convert to UTF8: 0xC3 0xA2 0xC2 0x80 0xC2 0x94 -> interpret as MS-CP1252: —.
<UmbralRaptor>
bofh: thanks. Also, aaaaaaaaa
<bofh>
Like that's fairly impressive but still not surprising levels of charset fuckery going on there, rofl.
<egg|laptop|egg>
bofh: I saw a chain with mac-roman a few months back
<egg|laptop|egg>
it has a nice flavour to it
<bofh>
egg|laptop|egg: I run into UTF-8 decomposed CP1251 more often than I'd like to nowadays for w/e strange reason.
<egg|laptop|egg>
!u —
<Qboid>
U+2014 EM DASH (—)
<bofh>
also wheretf did you run into a usage of MacRoman? (watch it be "PDF charset and/or a Type1 font".
<egg|laptop|egg>
I honestly don't remember, some weird document at work
<bofh>
+)*
<egg|laptop|egg>
the cat is jumping on things
<UmbralRaptor>
Including a portal from Normandy to Illinois?
<egg|laptop|egg>
O_o
<egg|laptop|egg>
I mean, it's possible: I haven't seen that black and white cat that ANBOcat was making weird noises at, and phl saw a similar cat in Zurich today...
<egg|laptop|egg>
clearly the cat just collapsed in Zurich so it's nowhere to be seen near ANBO
<UmbralRaptor>
egg|laptop|egg: more of a comment on what bofh's last line looked like, but that also works.
<kmath>
<mathgrrl> My son and I just 3D printed over 600 of these tessellating pentagons before we realized that they are not pentagons https://t.co/MVCpOZW7kt
<tawny->
haha
<UmbralRaptor>
egg|laptop|egg: sunbeam cat!
<egg|laptop|egg>
!wpn котя
* Qboid
gives котя an equation
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* UmbralRaptor
stares at W-α. Why would the E field above a square sheet of charge need i*natural log of something?
<UmbralRaptor>
(There's a better form with an atan, but still…)
<Ellied>
oh hey tawny, didn't see you there
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<tawny>
o/
<Ellied>
everyone, this is tawny, she's from the SCP wiki and heard from, uh, someone that this is where the cool KSP people hang out
<UmbralRaptor>
\o
<UmbralRaptor>
(Note, I'm only cool in terms of eg: U-J colors)
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<bofh>
!u 〆
<Qboid>
U+3006 IDEOGRAPHIC CLOSING MARK (〆)
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<egg|laptop|egg>
Sarbian: j'arriverai a paris dans l'apres-midi de mardi, et je pense que je resterai jusqu'a samedi midi
<e_14159>
Ellied: Wait, there are KSP people in here? :D
* APlayer
raises his hand
* e_14159
hands APlayer a blasphemy
<e_14159>
!wpn add blasphemy
* Qboid
gives add blasphemy a geodesic wave
<e_14159>
...
<APlayer>
LOL
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<UmbralRaptor>
e_14159: technically Principia is KSP related?
<kmath>
<fermatslibrary> Tupper's self-referential formula is a formula that visually represents itself when graphed at a specific location… https://t.co/164b4nBJqR
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<UmbralRaptor>
bofh: I didn't realize nukees was still around.
<e_14159>
UmbralRaptor: I thought egg|*|egg would've long implemented something sane instead :-)
<e_14159>
Something sane referring to KSP, not principia (which is also insane, but in a good way)
<UmbralRaptor>
!wa <egg|sanity|egg>
<Qboid>
UmbralRaptor: Seems that Wolfram is unable to understand that.
<egg|laptop|egg>
e_14159: hehe
* egg|laptop|egg
pets ANBOcat
<e_14159>
egg|laptop|egg: Wait, aren't you in Paris?
<egg|laptop|egg>
no, I'm in ANBO
<egg|laptop|egg>
taking the train to Paris on tuesday
<egg|laptop|egg>
UmbralRaptor: it's surprisingly harder to do afocal imaging with the Naglers than with the Huygens, Huygens-Mittenzwey and orthos
<e_14159>
egg|laptop|egg: Right. I was unable to decode French future forms.
<egg|laptop|egg>
:D
<egg|laptop|egg>
today in layers of french brokenness compensating each other: taxi confirms booking at 13:30 -> wrangle the SNCF site to try getting a ticket at 14:30 -> taxi says "oops I meant 15:30" -> sure, I still haven't managed to get the thing to work, I'll take the 16:30 train
<Ellied>
bofh: question - when selecting the length of an antenna, do you want to use the wavelength of the wave in air, or in the antenna material?
<soundnfury>
Ellied: wavelength in the antenna material
<soundnfury>
I think
<bofh>
antenna material, but the difference in these values is often so tiny it's irrelevant.
<soundnfury>
yeah it's basically the same because of skin effect, I think?
<Ellied>
ohh, is it
<Ellied>
I thought I remembered like ~2/3c for copper
<soundnfury>
I think that's group rather than phase velocity? Or something?
<Ellied>
hmm
<Ellied>
also, when is using a dipole preferable to a monopole?
<Ellied>
my intuition is that for cases where the circuit is isolated from ground (portable device especially) then a "monopole" antenna will really be a dipole with the body of the device acting as the other end, and doing it properly with a symmetrical antenna is a better idea, but I don't know if that's correct
<Ellied>
well, frequency's a constant, right? so slower wave should be shorter wavelength?
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<soundnfury>
Ellied: when you have a ground connection, the ground can act as the other leg, making your feed balance
<Ellied>
right
<soundnfury>
when you don't have a ground, indeed an unbalanced feed is a horrid thing. There's something called a "counterpoise" which is where you have a loading wire (possibly with inductors?) in place of the second leg
<Ellied>
what happens if you just stick another wire out there in-line with the existing antenna that's the same length and points in the opposite direction, attached to ground?
<Ellied>
er, not attached to ground
<Ellied>
attached to the chassis of the thing that isn't grounded but thinks it is
<soundnfury>
the ends of a dipole have large voltages on them
<soundnfury>
you don't want them attached to anything
<Ellied>
right, I meant the middle attached to the chassis
<soundnfury>
the middle is the feed point
<Ellied>
the feed is a differential pair, right? with one polarity going to each side?
<soundnfury>
yeah
<soundnfury>
although you can use an unbalanced coaxial feeder and then feed it with a 'balun'
<Ellied>
aha
<Ellied>
I think I was wondering basically what happens if you just don't use a balun and attach the coaxial line straight to the antenna
<soundnfury>
Bad things.
<Ellied>
gotcha
<soundnfury>
(specifically: you'd be unable to make the feed point look like 50 ohms resistive, which is what the radio wants to see)
<Ellied>
I'm hoping to play around with antenna designs a little bit with these dreadful FS1000 things. I managed to get about a block of range with the transmitter properly grounded and the receiver floating on a battery, both with quarter-wave whip antennas
<soundnfury>
you might want to play around in something like xnec2c (or other NEC port) to get a feel for how different antennas behave
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<Ellied>
hmm, looks interesting
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<egg|phone|egg>
UmbralRaptor :m42
<Qboid>
2d 0h 0m 0s left to event #23: Falcon Heavy [at 2018-02-06 18:30:00]. Say '!kountdown 23' for details
* UmbralRaptor
attaches egg|phone|egg to a trapezium.
<egg|phone|egg>
Very clear sky tonight because Northern wind
<egg|phone|egg>
Windy too
<egg|phone|egg>
But big mount
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<APlayer>
Okay, I think I have a problem. Is there anyone available willing to explain to me how Quaternion rotations work? I understand that Quaternions are a 4D version of complex numbers, but I can't relate this to 3D vector maths...
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<soundnfury>
APlayer: a pure imaginary unit quaternion is a point on the surface of a sphere
<APlayer>
Wouldn't that be some sort of 4D sphere, though?
<soundnfury>
nope, pure imaginary => real part is 0
<APlayer>
Ah
<APlayer>
Got it
<APlayer>
Why use a quaternion, then, even? Can I not just use a 3D vector for that?
<soundnfury>
3D vectors don't have a nice multiplication operator ;)
<APlayer>
Okay
<APlayer>
And the real part of the quaternion designates the "roll" of the vector?
<soundnfury>
Qu multiplication is well-behaved (specifically, Qus are a group)
<soundnfury>
uhhh, not actually sure
<egg|cell|egg>
UmbralRaptor : pretty trapezium
* UmbralRaptor
is mildly afraid of how many different ways multiplication could be defined for 4-vectors.
<APlayer>
Let's stick to dot products. ;-)
<soundnfury>
APlayer: I think Qu * is more like cross products (sort of)
<kmath>
<eevee> "yass, slay queen," we all chant in quiet deferent unison before Yass, the one who has finally reforged the legenda… https://t.co/cw0qC67f0p