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?
<UmbralRaptor> Anyway, today in math shenanigans https://twitter.com/fermatslibrary/status/960154478224793600
<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
<UmbralRaptor> o_O
<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
<bofh> Ellied: you've confusing wavelength & velocity.
<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)
<egg|cell|egg> UmbralRaptor:aargh cold
<UmbralRaptor> egg|cell|egg: reduced CCD noise! \o/
<egg|cell|egg> Any idea what to stare at wsw?
<UmbralRaptor> M30?
<egg|cell|egg> Windy tho so would not be ideal for imagery
<egg|cell|egg> Uh
<egg|cell|egg> That's next to the sun
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<UmbralRaptor> Oops
<egg|cell|egg> And firmly underground
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<egg|cell|egg> Or is it a neutrino source
<UmbralRaptor> Not especially.
<UmbralRaptor> Uh, try Herschel?
<egg|cell|egg> Too low too south
<egg|cell|egg> Too cold, going back in
<egg|cell|egg> Stab wind
<egg|cell|egg> It's because of the wind that the sky is clear of course
<egg|cell|egg> Can't win
<UmbralRaptor> Currently the sky is badly dewed over here.
<UmbralRaptor> So bad that it's dripping.
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* UmbralRaptor pokes capacitance problems with an ∫.
<UmbralRaptor> Apparently nested cylinders are way better than parallel plates?
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<UmbralRaptor> 🦉🦉🦉
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<kmath> <rclarke> As the other three turtles were led away by the secret police, Michelangelo realised the true implications of being a Party dude.
<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
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