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>
So I finally figured out how the hell you can mistranslate "斯特拉迪瓦里" as "Stella Bottom Tile".
<bofh>
(the answer is "you treat the last 3 hanzi as if they're words and not part of a transliterated name & then translate naively)
<bofh>
+"*
<Ellied>
my ex got an email from the Washington DC transit system that appeared to be in Chinese, but returned nonsense when fed to Google Translate. I guessed wildly that it was Basic Latin UTF-8 that had been mis-decoded as UTF-16, and that turned out to be right. :0
<Ellied>
I probably don't want to know what lead to that happening by accident.
<bofh>
So I once stumbled upon, uh
<bofh>
So take Russian, encode it in cp1252, then decode cp1252 bytes to "UTF-8", so you get a bunch of nonsense double-byte sequences.
<bofh>
I'm likewise not sure how in the everliving heck that happened.
<egg|anbo|egg>
UmbralRaptor: well just type it in?
<egg|anbo|egg>
UmbralRaptor: google translate even does a transliteration thingy so if you don't have an appropriate input method you can transliterate and it backtransliterates
<egg|anbo|egg>
UmbralRaptor: yeah okay that's some langdet fail >_>
<egg|anbo|egg>
I've had success occasionally with OCRing some CJK ideographs with goggles
<egg|anbo|egg>
or was it translate directly? dunno
<UmbralRaptor>
egg: it failed to transliterate, also. =\
<egg|anbo|egg>
UmbralRaptor: hm you're on mobile?
<UmbralRaptor>
Yeah
<egg|anbo|egg>
dunno if it transliterates there
<egg|anbo|egg>
UmbralRaptor: but you can just set your keyboard to russian
<UmbralRaptor>
egg|anbo|egg: yeah. Hunting and pecking on a soft keyboard is Fun. Especially given the amount of space taken up by keyboard+image+Google translate
<kmath>
YouTube - Mushihime-sama Futari Ultra Mode Last Boss
<bofh>
I believe I've heard the last attack described as being "harder to dodge than literal rain in a thunderstorm"; I've never managed to get far enough to even get to it.
<SnoopJeDi>
bullet hell is a fascinating genre
<bofh>
it's funny since conceptually it's simple, imagine the geodesics along a funnel, the bullets travel along such paths, except one is clockwise and the other counterclockwise.
<SnoopJeDi>
ah yea I've seen that sort of pattern before. really high density?
<bofh>
yep, and because the two sets travel in opposite directions they interlock at random, it's trivial to get accidentally boxed in
<bofh>
and you have to read both at the same time, which is nigh-impossible.
e_14159 has quit [Ping timeout: 186 seconds]
e_14159 has joined #kspacademia
<UmbralRaptor>
That feels like the sort of thing that needs to be deterministic.
<UmbralRaptor>
Or at least planned so maximally bad RNG doesn't autokill?
* UmbralRaptor
is still amused at bullet movement being described with geodesics.
<kmath>
<mcclure111> We sat and marveled at the still beauty of the trees of the forest. We did not know how quickly we lived, we did no… https://t.co/L8HdxFEDkK
<kmath>
<DesertBus> Good morning @DesertBus ! Let's get this day 3 on the road! #DB2017 #Coffee #coffeecoffeecoffee #redpandablep https://t.co/KaVPluhLey
ferram4 has quit [Read error: Connection reset by peer]
ferram4 has joined #kspacademia
icefire has joined #kspacademia
<soundnfury>
!wpn
* Qboid
gives soundnfury a Sumerian reversed hydrochlorofluorocarbon with a motor attachment
<soundnfury>
I guess the 'reversed' means structural isumerism?
<kmath>
<sciencescanner> @Dereklowe When mouth-pipetting 880 ammonia (yes, really) a classmate who got a mouthful was told to immediately ta… https://t.co/oDo1ZpmYVX
<bofh>
there are so many things terrifying about that but let's start with "mouth-pipetting 0.880 ammonia"
<kmath>
<sciencescanner> @Dereklowe Be breathed out louds of ammonium chloride precipitate before sluicing with LOTS of water - and emerged… https://t.co/Md5qk7Lpiy
<kmath>
<hikari_no_yume> okay so idea I had the other day but forgot to type out game æsthetic: heraldrypunk sci-fi game themed around countries’ heraldic devices
<UmbralRaptor>
All hail the Amerilluminati?
<SnoopJeDi>
praise be?
APlayer has quit [Ping timeout: 383 seconds]
APlayer has joined #kspacademia
<APlayer>
;seen ellied
<kmath>
APlayer: ellied (~ellie@lpc-121-178.lpc-south-classroom.depaul.edu) was last seen posting in #kspacademia 19 hours and 27 minutes ago
<UmbralRaptor>
Yay, Twidere update to support 280. (with numbers, rather than ＴＨＥ ＯＲＢ)
<FluffyFoxeh>
yeah who thought that orb thing was a good idea, it makes the limit seem fuzzy when it isn't
<UmbralRaptor>
Also, Ｔｈｅ Ｏｒｂ has rather few fill levels shown, so it might mislead you.
kmath has quit [Remote host closed the connection]
kmath has joined #kspacademia
<bofh>
19:59 < FluffyFoxeh> yeah who thought that orb thing was a good idea
<bofh>
I'm starting to suspect that Twitter lately won't implement something *unless* it is a fucking awful idea in at least some capacity.
<egg|anbo|egg>
!wpn UmbralRaptor, bofh, whitequark, et al.
* Qboid
gives UmbralRaptor, bofh, whitequark, et al. a Bekenstein quill
<UmbralRaptor>
The quill vanishes in a burst of Hawking Radiation.
<bofh>
LOL
<egg|anbo|egg>
C∞ cat
<Iskierka>
so I think I just gave my laptop an aneurysm
<egg|anbo|egg>
Ꙩ_ꙩ
<Iskierka>
something was using 100% of a processor, went asking the offenders to terminate, accidentally got dbus and it turns out that's not easy to restart and essential for almost everything. Including being able to log out or turn off gracefully
egg|cell|egg has joined #kspacademia
egg|phone|egg has quit [Read error: Connection reset by peer]
egg|phone|egg has joined #kspacademia
<UmbralRaptor>
Oops
egg|cell|egg has quit [Ping timeout: 183 seconds]
APlayer has quit [Ping timeout: 207 seconds]
<egg|anbo|egg>
UmbralRaptor: M31! also the pleiades!
<egg|anbo|egg>
also it's cold so I'm back inside with anbocat
<egg|anbo|egg>
but the skies here are much beter than zurich's
APlayer has joined #kspacademia
<egg|anbo|egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a fluorine cabbage which strongly resembles a gasket
<bofh>
!wpn egg|anbo|egg
* Qboid
gives egg|anbo|egg an antimony classmethod
<Ellied>
hi, still alive, just been contradancing this weekend
<bofh>
contradancing?
<Ellied>
APlayer: first off, you're probably measuring infinity in reverse because your multimeter is applying less voltage to test than the band gap of the body diode (this is common; most of my meters always measure diodes as OL both ways)
<APlayer>
Let me switch to my phone, just a second
<Ellied>
bofh: traditional American set dancing. see also: square dancing, line dancing
BPlayer has joined #kspacademia
<BPlayer>
Okay, done
<Ellied>
these dance weekends are with folks who've taken it to a pretty high level, and I'm just learning now (my family's been into it for many years), so it was a lot to tackle, but I had a wonderful time. The music was fantastic, played by a fairly new avant-garde dance band
<BPlayer>
Okay, so I figured I'd probably fail to "activate" a diode with the current a multimeter supplies, but does that result in infinite resistance or measurably high resistance?
<Ellied>
usually quite large, to the extent that the meter can't see anything.
<Ellied>
diode forward leakage currents are usually nA-µA
<BPlayer>
So beyond the 16 MOhms I got
<BPlayer>
But that does not explain what happens when I charge or discharge the gate
<BPlayer>
In particular I am wondering about the extremely slow response
<Ellied>
I wouldn't take that measurement literally; my guess is the meter was assuming you were giving it an ohmic load (you weren't; it was more like a constant-current load) and was seeing a few µA of leakage
<Ellied>
the slow response is indeed odd
<BPlayer>
I currently have the MOSFET and a multimeter right in front of me, is there anything I may try to help you identify what's happening?
APlayer has quit [Ping timeout: 383 seconds]
<BPlayer>
May the MOSFET leak the gate charge slowly so that in effect it took very long to fully charge up?
<Ellied>
Does the meter happen to have a "diode test" function?
<Ellied>
I could see the gate charge leaking out and turning it *off* over the course of 30-60 seconds, but connecting the gate directly to the negative rail with a load from drain to ground should turn it on very fast
<BPlayer>
It has a diode sign as a secondary... Uh, option? Along with the resistance measurement
<Ellied>
aha, there we go. Use that, and probe between source and drain (both ways)
<BPlayer>
Not sure what exactly that means, I always just turn it into that position and measure resistance
<Ellied>
does the screen show units? see if you can do anything while it's set like that to make it change from Ω to V
<Ellied>
Er, I'm assuming this is a digital meter. Is that right?
<BPlayer>
Oh yes, I can make it show V
<BPlayer>
It is a digital meter indeed
<BPlayer>
So, one way it shows 0.6V, the other is "0L", whatever that means in this context
<BPlayer>
I always assumed this is infinity, but apparently I am wrong
<Ellied>
Great. The way that shows 0.6V will have the + lead attached to the drain and the - lead attached to the source.
<BPlayer>
So I am measuring the internal diode?
<Ellied>
OL means "the meter tried the highest voltage it had available and still got no current, so it gave up" in this context.
<Ellied>
yup.
<BPlayer>
Ah; got it
<Ellied>
(if you get OL while measuring voltage, stop doing whatever you're doing; if you get OL while measuring current, then stop doing that and try measuring a small current to make sure you haven't blown the fuse)
<Ellied>
OL with the resistance/diode setting is nothing to worry about, that's just the default open-circuit state
<BPlayer>
Now, I recall a MOSFET test tutorial recommending to charge the gate with the multimeter's positive lead. Does that make sense?
<BPlayer>
Ah, got it (the OL thing)
<Ellied>
err, a little. In this case, since it's a P-channel, I'd put the - lead to the gate and the + to the source, then measure source to drain (the way that gave you OL when the gate was discharged)
<Ellied>
naturally you'll want to avoid touching the gate after charging it so you don't draw off the charge
<BPlayer>
Drain-Source is 0.6 V, Source-Drain is 0 v
<egg|anbo|egg>
!wpn Ellied
* Qboid
gives Ellied a projection
<BPlayer>
I guess that makes sense
<BPlayer>
!wpn egg
* Qboid
gives egg an astatine group
<BPlayer>
Touching gate and Source while the measurement (whatever it is) is 0 V makes it reset to OL too
<BPlayer>
(This was an implicit question as to what I am even measuring in volts here :P)
<Ellied>
So in that dial setting, the meter is putting the battery voltage across the probes, through a sizable resistor
<Ellied>
In either case, it's measuring the voltage across/current through the probes. In Ω mode, it's calculating the resistance for you; in diode mode, it's just giving you the voltage across the probes
<Ellied>
so that constant-voltage components, like diodes, can have their barrier potential measured
<Ellied>
e.g. if you put a germanium diode across, you'd get ~0.3V, because germanium has a lower band gap
* soundnfury
gives Ellied a geranium diode
<soundnfury>
(yeah, it's an old joke. Sue me)
<BPlayer>
The band gap thing is something else I would like to learn more about, but not right now
<Ellied>
with LEDs, you can use this to find out what color they are, although most meters can't manage blues because the barrier voltage is about 3V and a couple of batteries can't get high enough above that without boosting it up, so they'll just OL you
<BPlayer>
Ah, okay
<Ellied>
The really expensive fancy meters in my department use 9V batteries and I think can manage most realistic semiconductor junctions (barring cases with many in series; I don't think it boosts)
<Ellied>
The newer cheaper ones we have don't go over about 2.5V
<BPlayer>
But isn't there also this kind if diode which is just white but has a red (or green or yellow) colored filter around it?
<Ellied>
not generally, no
<BPlayer>
s/diode/LED/
<Qboid>
BPlayer meant to say: But isn't there also this kind if LED which is just white but has a red (or green or yellow) colored filter around it?
<Ellied>
I mean maybe, but the way white LEDs work is they're a blue LED with some yellowish phosphor wrapped around it that produces most of the visible spectrum, between the blue from the actual diode junction and the green-yellow-red from the phosphor
<BPlayer>
Well, maybe not white but some other color
<BPlayer>
The point being that not every diode's color is entirely dependant on the material it is made from
<soundnfury>
BPlayer: right but filters won't help you because the diode light is monochromatic
<soundnfury>
(barrier voltage * electron charge = hf, I think)
<Ellied>
yes, the ideal case of an LED is truly monochromatic. A few factors do spread the spectrum a little, but not much.
<soundnfury>
which is why if you want it to be white you need a phosphor to re-radiate
<BPlayer>
But I mean, there are those diodes which are just physically and visibly colored red, aren't there? How does that work?
<Ellied>
Those are actually red-emitting junctions
<Ellied>
the filter is redundant, mostly just helps you keep track of colors
<BPlayer>
Ah, okay then
<soundnfury>
Ellied: it might also serve as a diffuser
<Ellied>
that too
<soundnfury>
(I mean, not that it _needs_ to be coloured for that, but why not)
<BPlayer>
Life consists of learning new goodies every day :D
<Ellied>
With (older) green ones, the direct light is very very yellow-green, so they *try* to get it a tad greener with the filter, which I guess must spread the spectrum out a little and let through the green bits of the spread more. If you overdrive an old green LED, it'll get much yellower
<Ellied>
(newer green LEDs are InGaN, same as blue, just doped differently. They're much brighter/more efficient, and the color is more towards blue than yellow, but much closer to what we see as "true" green than the older ones)
<BPlayer>
Is it possible to mix the materials that make yellow-green and blue-green LEDs? (Well, I do see t coming that the answer is "No", so take this as "Why can't you mix...?")
<Ellied>
well I mean, you can sort of do that, but spectrally speaking you've just put two separate sources of two different colors very close together
<Ellied>
color mixing works to our eyes because we're only able to differentiate color by comparing the responses of three different color-biased receptors
<Ellied>
To a spectrograph, yellow-green light is a completely different thing than yellow and green light together
<soundnfury>
BPlayer: you can't just stick both dopants on one piece of silicon, 'cause then the voltage across the junction will be the lower barrier voltage and the other junction won't conduct at all
<soundnfury>
(not _quite_ true, because there's _some_ resistance, but still)
<Ellied>
you can see this if you look at various light sources through a diffraction grating. purple/magenta LEDs are a blue LED stuck to some red phosphor, so you can see two separate blobs of light in the grating, one blue and one red
<BPlayer>
So use lots of one and very little of the other?
<Ellied>
contrast to a UV LED, which might appear similar to those, but is in fact a single color centered at about 395 nm for most common ones
<Ellied>
I don't really know enough about semiconductor doping to say what's possible and what's not in terms of band-gap gaming
<BPlayer>
Ellied: Got it, but I think for most applications it does not matter what a spectrograph says, because you care about what that guy opersting this machine sees?
<Ellied>
if the LEDs are used as indicators, sure
<soundnfury>
BPlayer: the other case where what Ellied's talking about matters is when you use the LEDs for illumination
<soundnfury>
because then when the light reflects off objects it _really_ shows
<soundnfury>
(this is the "red things look black under streetlamps" effect in another guise)
<BPlayer>
I can't see a use case if green LEDs for illumination :P
<Ellied>
early "white" LEDs were simply a red, blue, and green LED in the same package with a diffuser. It looks fine if you just look at it, but when it shines on things they look weird
<soundnfury>
... haunted house? v0v
<BPlayer>
In that case weird effects seem desirable
<soundnfury>
heh, fair point
<Ellied>
nowadays, phosphors give much better spectrum coverage, nearly comparable to incandescent or daylight as far as our eyes are concerned, although there's some deficiency in the blue-green and basically nothing shorter than 450nm
<Ellied>
compared to blackbody light sources, those LEDs will also appear very difficient in red, since blackbodies put out tons of red/IR and LEDs hardly any, but that doesn't seem to bother most people
<BPlayer>
Also, is this somehow related so seeing individual RGB components when blinking or skimming very fast over a surface illuminated with white light from a beamer (eg. whiteboard and a blank image from a beamer on it)
<BPlayer>
?*
<Ellied>
I assume by beamer you mean the machine we call a projector in the US?
<BPlayer>
Uh, those that project a computer image onto a wall, whiteboard or similar?
<Ellied>
that's probably related, but it also could[citation needed] be some kind of multiplexing (e.g. the projector only has one color lit at a time and just cycles through them very fast to appear continuous)
<soundnfury>
could just be a shadow mask thing?
<BPlayer>
Heh, never realised that was a "false" English word
<Ellied>
lots of LED matrix displays are multiplexed, so if you look at them while you're chewing something crunchy, they appear to wiggle
<Ellied>
often they'll only have one row (or segment, if it's a segmented display) on at one time, and just scan across them very fast
<BPlayer>
It's like we call Denims "Jeans", a mobile phone "Handy" or a happy ending "Happy End"
<Ellied>
jeans is in common use here, denims not so much
<Ellied>
I think of denims as a group term for jeans and jackets made of the same material
<BPlayer>
Well, yes, historically it refers to the material
<BPlayer>
But German is still weird for using certain totally English sounding and looking words, which in fact are just a lie, haha
<Ellied>
("very fast" in the aforementioned case usually means "as fast as the poor microcontroller driving the thing can manage" which, given that it has to shift out all three colors of the whole row and then flick the latch on for long enough for you to see, might not be more than a couple kHz)
<soundnfury>
BPlayer: what does "Oldtimer" mean to you? :P
<BPlayer>
In German, that's a car older than perhaps 30 or so years
<soundnfury>
yup, thought so
<BPlayer>
Since we are talking English, it refers to a person who is... Well, an oldtimer
<Ellied>
I rather suspect that there are more specialized ICs available which will accept image data and handle the shifting/latching/multiplexing themselves at very high speed, but I haven't looked for or seen such yet
<BPlayer>
Ellied: But I mean something different. Ever experienced that when you quickly glance from one direction into another and there is a projector (AKA beamer) light in your way, you can ver clearly and distinctly see red, green and blue specks?
* Ellied
needs to have a look at [INTERFACE NAME HERE]-to-HUB75 converters
<Ellied>
I can't recall. Maybe?
<BPlayer>
Try to do it on purpose next time you are at a presentation or something
<Ellied>
what you're describing sounds like it must be multiplexed; different machines are likely to function different ways
<BPlayer>
I see it on every single projector, I don't recall ever not seeing that
<Ellied>
the projectors in the classrooms here don't do that AFAIR, but they do have a weird thing where purple (presumably blue and red) and green are handled separately (occasionally failing separately) and polarized orthogonally
<BPlayer>
Perhaps it's something specific to the projectors used at our school or in Germany, but I doubt we have different ones than anyone else
<BPlayer>
Oh, let's not talk about projectors failing. I've accumulated such an amount of stories and experiences with that, it's almost time to write a novel and publish it
<Ellied>
hehe
<BPlayer>
Some of the failures were very interesting indeed. I remember one projector which was broken for months, it would totally disort colors with a vignette-shaped pattern. I.e. it looked a lot like someone made a vignette shaoed selection in PS, and shifted the color hue by about 90 deg in one direction on the center part and 90 deg in the other direction on the outer parts
<Ellied>
usually one of them just takes longer to warm up, so the projection will come up, but purple.
<Ellied>
heh
<BPlayer>
But hey, the content was still visible, so we kept using it. No idea what lazy person finally decided to repair it
BPlayer has quit [Ping timeout: 207 seconds]
APlayer has joined #kspacademia
<APlayer>
Damn (probably) my router for (probably) occasionally randomly restarting
<bofh>
"OAVs > 1 were obtained for 19 compounds, among which ethyl (2S)-2-methylbutanoate (fruity; OAV 1700000), ethanethiol (rotten onion; OAV 480000), and 1-(ethylsulfanyl)ethane-1-thiol (roasted onion; OAV 250000) were the most potent, followed by methanethiol (rotten, cabbage; OAV 45000), ethane-1,1-dithiol (sulfury, durian; OAV 23000), and ethyl 2-methylpropanoate (fruity; OAV 22000). Aroma simulation and
<bofh>
omission experiments revealed that the overall ...
<bofh>
... odor of durian pulp could be mimicked by only two compounds, namely, ethyl (2S)-2-methylbutanoate and 1-(ethylsulfanyl)ethane-1-thiol, when combined in their natural concentrations."
<bofh>
like I mean come on, when one of your odorants is *literally* ethyl mercaptan...
<bofh>
Also from personal experience (don't ask) 1-(ethylsulfanyl)ethanethiol does *not* smell like roasted onion, it's closer to, erm, very very very well-rotted garlic.
<APlayer>
Reminds me of that chemistry class when the teacher intriduced butyric acid. "It smells like pineapple!" all the descriptions say.
<APlayer>
"Pineapple smell" is now an euphemism for me
<bofh>
Butyric Acid smells like a mix of rancid butter & rancid vomit as far as I'm concerned.
<whitequark>
lol
<APlayer>
Apparently it is the compound responsible for the smell of pineapples, when the concentration is low
<APlayer>
Long story short, the concentration was not low enough
<soundnfury>
IIRC my chem textbook at school described it as smelling like rancid butter
<soundnfury>
since I have never smelled butyric acid _or_ rancid butter, I couldn't say :/
<APlayer>
It smells like vomit
<bofh>
Doesn't surprise me, that's an oddly common phenomenon. Indole for instance smells like jasmine flowers at low concentration and faeces at high ones.
<bofh>
I'm actually curious what happens there, is it binding to two separate odor receptors at different binding constants, or is it signal transduction thru the same one receptor just at different activation thresholds differing neuronal effects occur?
<bofh>
brb pubmed
<bofh>
soundnfury: if you can find gingko fruit (which might be tricky now since it would've prolly all fallen about a month ago or so), crush one up, they apparently have very nontrivial butyric acid concentrations in them.
<APlayer>
And the chemistry room had no windows, so the smell lasted for the whole lesson
<soundnfury>
bofh: I'll pass, thanks
* APlayer
throws a gingko fruit at bofh
* bofh
dodges
<bofh>
!wpn APlayer
* Qboid
gives APlayer a multimeter
<APlayer>
Thanks, I already have one, though :D
<APlayer>
!wpn bofh
* Qboid
gives bofh a Лидов–古在 cabbage
<bofh>
great, just what I needed, moar sulfhydryls.
<soundnfury>
APlayer: does the one Qboid gave you have a diode tester?
<APlayer>
Is "gingko-fruit" an existing wpn?
* UmbralRaptor
perturbs the cabbage with a ninth planet.
<bofh>
APlayer: <shrug> poke egg|anbo|egg?
<UmbralRaptor>
ginko… fruit?
<soundnfury>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a defective interferometer
<bofh>
they do form seeds (I'm not sure if it's a true fruit - the outer layers are the ovary itsself), but the fertilization occurs via motile sperm like in ferns, instead of via pollen.
<bofh>
Huh.
<APlayer>
It is attractive in appearance, but contains butyric acid (also known as butanoic acid) and smells like rancid butter or vomit when fallen.
* UmbralRaptor
thought that they worked like ferns for some reason.
<APlayer>
Wikipedia on the fruit ^
<UmbralRaptor>
hrm
<bofh>
They do and don't, apparently.
<APlayer>
Anyway, soundnfury, you don't necessarily need to smell butyric acid, if you smelled vomit. It's absolutely the same.