--- Log opened Sat Mar 28 00:00:35 2015
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02:15 < delinquentme> Carl -- You and 4 Friends are Invited to the Heroes of the Storm Closed Beta!
02:15 < yoleaux> 26 Mar 2015 05:06Z <kanzure> delinquentme: https://www.youtube.com/watch?v=bjRUee5S44w
02:15 < yoleaux> 27 Mar 2015 01:57Z <kanzure> delinquentme: nevermind
02:15 < delinquentme> kek.
02:15 < delinquentme> kanzure: https://www.youtube.com/watch?v=Cxov0BQ2fpE
02:15 < delinquentme> https://www.youtube.com/watch?v=7MzhpZ5tVQU
02:15 < delinquentme> this is good though
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06:41 < kanzure> 00:27 [freenode] DCC aborted receiving file STARTKEYLOGGER 0 0 0A سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ from MegaDork
06:41 < kanzure> MegaDork :(
06:41 < kanzure> i was hoping he was a real user
06:41 < kanzure> had good nick
06:59 < archels> .tr  سمَـَّوُوُحخ ̷̴̐خ ̷̴̐خ from Me
06:59 < yoleaux> archels: Sorry, that command (.tr) crashed.
07:07 < kanzure> bloop
07:17 < kanzure> "Also, it turns out senators have a hard time differentiating the APA (American Psychiatric Association, fighting tooth and claw against psychologist prescribers) from the APA (American Psychological Association, fighting tooth and claw for psychologist prescribers) and they end up freaking out and trying to figure out why the same people are lobbying for both sides and whether this is some kind of weird shrink mind game thing."
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10:08 < kanzure> "In regards of a suitable system, I was thinking of http://en.wikipedia.org/wiki/Lymnaea_stagnalis which is easy to culture, has big neurons and a well-defined, compact 20 kNeuron central ring ganglia (the scale bar is 1 mm) which is reasonably easy to prep: http://upload.wikimedia.org/wikipedia/commons/5/58/Lymnaea_stagnalis_central_ring_ganglia.jpg "
10:13 < kanzure> what happened to that dude that was trying to grow a potato in his stomach
10:15 < chris_99> lol
10:15 < chris_99> seriously
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10:42 < nmz787> kanzure: some irish dude?
10:43 < kanzure> i dunno
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11:08 < chris_99> nmz787, i did the calibration thing and now have SG graphs https://www.anfractuosity.com/projects/zymeter-simple/ theres a big bump which can only be due to yeasty foam i believe
11:26 < delinquentme> kanzure:nmz heath
11:26 < kanzure> hm?
11:26 < delinquentme> when you modify an object.... mutate it without redefining a new object
11:26 < delinquentme> that is referred to as what
11:26 < delinquentme> " in place "
11:26 < delinquentme> ?
11:26 < delinquentme> mutation ?
11:27 < kanzure> immutability/mutability is a property of some types in some type systems
11:27 < delinquentme> http://pandas.pydata.org/pandas-docs/dev/generated/pandas.DataFrame.drop.html
11:27 < delinquentme> this is whats making me ask
11:27 < delinquentme> dataframe.drop('RP1Imp', 1, inplace=True)
11:27 < delinquentme> vrs
11:28 < delinquentme> dataframe = dataframe.drop('RP1Imp', 1)
11:28 < kanzure> another related term you may be interested in is "idempotency"
11:28 < delinquentme> yeah i know about that
11:28 < kanzure> "A function with side effects is said to be idempotent under sequential composition (f; f) if, when called with the same argument twice, the second call returns the same value and has no side effects which can distinguish it from the first call."
11:29 < kanzure> inplace=True there is more about mutability in python i suppose
11:29 < delinquentme> yeap. if function is idempotent, you can call it multiple times and the output object remains static
11:29 < kanzure> some of the standard library functions in python are immutable, so all of their methods return new instances or whatever
11:29 < kanzure> whoops i mean some of the standard library types
11:30 < delinquentme> yeah but you're not answering my question.
11:31 < delinquentme> redefinition of an object by equation ... vrs mutation in place, without equation/re equating that object
11:32 < kanzure> usually the reasons why i choose in-place modification is related to "well copying this entire object would require way too much memory"
11:32 < kanzure> although sometimes i may still return "self" anyway because i like to pretend i am good at method chaining
11:33 < kanzure> maybe the word you are looking for is side-effect-free
11:34 < delinquentme> sure and human defined object creation / destruction vrs consigning to GC
11:34 < kanzure> that's quite verbose.
11:38 < delinquentme> loquacious even
11:39 < kanzure> let's not get carried away
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12:06 < delinquentme> Ok so #pydata  is being useless ... and #pandas isn't really a channel.  SO! I've got 2 dataframes which id like to merge .  I Need to get them aligned by timestamp.  What is the most efficient way to do this ?
12:08 < kanzure> is there a merge function?
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12:52 < delinquentme> KANZURAGI
12:52 < delinquentme> WHEN HANGOUT
12:52 < delinquentme> OH WAIT. KINDA R
12:52 < delinquentme> HA
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13:33 < nmz787> http://en.wikipedia.org/wiki/Inonotus_obliquus#Medicinal_use
13:33 < kanzure> .wik
13:33 < yoleaux> Search for an article on Wikipedia
13:33 < kanzure> bah
13:36 < nmz787> chris_99: ahh, so maybe you need some agitator to de-bubble it... then let it sit a few minutes, then sample... or maybe you want to sample right after turning off the agitator (if the yeast froth it fast enough to start affecting the gravity)
13:36 < chris_99> yeah that could work, i think i'm gonna play with ultrasound now though
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13:47 < nmz787> chris_99: would that be sensing from the bottom of the tank then, to avoid the foam? or would the foam be so much less dense that it wouldn't interfere with the signal? or is this ultrasound to break up the foam/de-bubble?
13:47 < chris_99> yeah at the bottom
13:47 < chris_99> the foam is all on the top
13:48 < nmz787> so that's just a normal robot-type ultrasound distance sensor then?
13:48 < chris_99> nah
13:48 < chris_99> it's a 2MHz one, and i'm gonna sample the output with a 100MHz ADC
13:49 < chris_99> and do processing with an FPGA
13:52 < fenn> *cough* overkill *cough*
13:53 < chris_99> heh
13:53 < kanzure> overkill? i knew that guy once.
13:54 < archels> chris_99: saw on your site that you built a cloud chamber---cool stuff.
13:54 < archels> I want to build one with a friend as well, any tips?
13:55 < chris_99> that didn't work properly for me alas, the peltier didn't seem to get the chamber cool enough
13:55 < chris_99> i bought a 400W one to try, but haven't got round to it yet
13:56 < chris_99> if you try that approach, it turns out server PSUs output ~50A so you can use those for it
13:56 < chris_99> and they're dirt cheap on ebay
13:56 < chris_99> like £17
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13:59 < nmz787> the PSU or the peltier?
13:59 < nmz787> PSU or TEC?
13:59 < chris_99> the PSU
14:02 < chris_99> http://www.tjinguytech.com/my-projects/HP47A
14:02 < chris_99> thats the type of PSU
14:02 < chris_99> i got
14:15 < archels> yeah, I have a couple of old ATX supplies
14:15 < archels> I read about stacking Peltiers
14:16 < archels> apparently you have to get different power grades and arrange them in a certain way to get the largest temperature differential
14:16 < chris_99> they won't give you a high amperage though
14:16 < chris_99> i've used them myself and had issues with them getting far too hot
14:16 < chris_99> (the cables)
14:16 < chris_99> yeah i think my setup was stacked iirc
14:17 < chris_99> it's hard to see but i'm pretty sure there are 2 red wires
14:19 < archels> oh, I think I have some that'll do 20A, possibly 2 * 20A at 12V
14:19 < archels> otherwise modern ATX supplies will do 4 * 20A for around €100
14:19 < archels> that's about a kilowatt, should get us some place :)
14:21 < chris_99> the thing is, when they say they can do 1KW i think it's actually across all voltages, so i don't think it can really put out 1kW at a single voltage
14:21 < chris_99> whereas these server PSUs can output 50A via one cable
14:22 < chris_99> i'm sure i tried a 400W peltier with an ATX psu and it just turned off
14:23 < archels> 400W, that's pretty brutal
14:23 < chris_99> mmm heh
14:23 < archels> any ballpark figures for how much Peltier power you need to maintain a certain temperature differential?
14:24 < archels> if you're doing a cloud chamber in 25°C ambient, you need to maintain roughly 60°C difference
14:24 < chris_99> not off the top of my head sorry, you've got to use a really beefy fan too, to chill it too
14:25 < chris_99> semi related - https://www.anfractuosity.com/projects/peltier-fermentation-control/ that has 4 peltiers, but if you look at the graph the peltiers aren't cooling at all really, which i think is due to the fan being crap heh
14:28 < chris_99> maybe a metal container would help also?
14:28 < chris_99> instead of a plastic tub
14:34 < archels> hehe yeah, that fan is pitiful
14:35 < chris_99> mmm
14:35 < chris_99> i took appart a hairdryer one which i need to use
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14:41 < archels> came across a bunch of water cooling setups too
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14:55 < kanzure> 14:15 <+nsh> i can't wait until my roboplasty
14:55 < kanzure> 14:15 <+nsh> i've been a 90 foot call solid gold robot trapped in the body of a boy for 30 years
14:55 < kanzure> 14:15 <+nsh> and it's about damn time society did something about it
14:55 < kanzure> 14:15 <+nsh> *foot tall
14:55 < kanzure> 14:15 <+grr> are your emoglands secreting emotions again?
14:56 < archels> chris_99: just ordered some gear from DealExtreme ^_^
14:57 < chris_99> heh, whatcha order?
14:59 < archels> some Peltiers, CPU cooler, temp sensor and PWM controllers
15:00 < archels> ordered 360W of Peltiers in total
15:00 < archels> we'll see how far we get
15:01 < chris_99> neat :)
15:08 < ParahSailin> i think theres something called a heat engine that can also do temperature differences
15:14 < archels> a Stirling engine?
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16:26 < nmz787> chris_99: do you know how to use the Rthja value in the datasheet for that peltier motor-driver chip? it says 35K/W... but I'm not sure how to determine at a given voltage and the max of 43A, how big of a heatsink and how much airflow you'd need on average
16:27 < chris_99> nah i don't sorry, i just bought the module that had a heatsink on
16:27 < nmz787> obv your supply might not emit 43A...  but in general I can't tell how much cooling you'd need on the driver board for e.g. 400W of load (peltier)
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22:17 < kanzure> security stuff https://exploit-exercises.com/
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22:50 < nmz787> this is pretty exciting http://hackaday.com/2015/03/28/arduino-ide-support-for-the-esp8266/
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--- Log closed Sun Mar 29 00:00:36 2015