| --- Log opened Wed Sep 04 00:00:15 2013 | ||
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| kanzure | brownies: remind me to never let you touch my source code | 06:25 |
|---|---|---|
| brownies | kanzure: you already protected against that by writing it all in javascript, remember? | 06:26 |
| kanzure | not good enough damn it | 06:26 |
| gradstudentbot | Sorry for wasting your time. | 06:27 |
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| heath | gradstudentbot: wtf | 06:56 |
| gradstudentbot | Hah, look at figure 6. That's definitely a little weird. | 06:56 |
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| heath | https://github.com/google/gumbo-parser | 11:40 |
| heath | .title | 11:40 |
| yoleaux | google/gumbo-parser · GitHub | 11:40 |
| heath | "Gumbo - A pure-C HTML5 parser." | 11:40 |
| heath | "To install the python bindings, make sure that the C library is installed first, and then sudo python setup.py install from the root of the distro. This installs a 'gumbo' module; pydoc gumbo should tell you about it." | 11:40 |
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| heath | thanks for starring git-pissed, i didn't know about dygraphs | 11:48 |
| kanzure | the stalk is strong in you | 11:55 |
| kanzure | frankly i'm surprised you can keep up with that feed, i think i just sent out like 10 pull requests in the last hour | 11:55 |
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| n_bentha | question: are these buffers legit? : http://openwetware.org/wiki/Qiagen_Buffers | 13:13 |
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| heath | given this challenge https://gist.github.com/heath/e8ad894f99aaa016e168 | 13:42 |
| heath | wrong room, this isn't the PEG room | 13:42 |
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| chris_99 | ThomasEgi, be thee about per chance | 14:36 |
| ThomasEgi | what who where me? | 14:37 |
| * ThomasEgi slams his coffin open | 14:37 | |
| ThomasEgi | who summoned me? | 14:37 |
| chris_99 | hehe, have you ever done anything to measure capacitance before? | 14:37 |
| ThomasEgi | yeah. | 14:38 |
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| chris_99 | so basically i was looking at this | 14:38 |
| chris_99 | http://www.kickstarter.com/projects/parasitx/the-beerbugtm-digital-hydrometer/posts/568516 | 14:39 |
| gradstudentbot | I'm working on a paper, I need to be left alone. | 14:39 |
| chris_99 | 'Our new sensor relies on highly accurate capacitance measurements between a blade and target to read and report the changing density of your brew.' | 14:39 |
| chris_99 | how hard would it be to measure the capacitance with an ADC | 14:39 |
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| ThomasEgi | what capacitances are we talking about? like how many F (roughly) | 14:40 |
| chris_99 | no idea tbh, i've not done any experiments with the capacitance of beer. i'm guessing uF or pF ish | 14:41 |
| panax | 'capacitance of beer' | 14:42 |
| panax | thats a big range | 14:42 |
| chris_99 | over like 1cm lets say | 14:42 |
| panax | the adc itself is probably a switched capacitor adc | 14:42 |
| chris_99 | ;) | 14:42 |
| ThomasEgi | there are like 6 orders of magnitude between a uF and a pF | 14:42 |
| chris_99 | roughly speaking though how does one measure capacitance | 14:42 |
| panax | you measure charge | 14:43 |
| ThomasEgi | you build a bridge | 14:43 |
| ThomasEgi | like a wheatstone bridge | 14:43 |
| chris_99 | oh ok, then what? | 14:43 |
| ThomasEgi | the you connect it to an AC source. | 14:43 |
| panax | you can do that too | 14:44 |
| chris_99 | and measure the voltage at the other end? | 14:44 |
| ThomasEgi | this is an AC meassurement. | 14:44 |
| panax | measure the frequency response | 14:44 |
| chris_99 | ah ok, this sounds very cool | 14:45 |
| chris_99 | what's this called? | 14:45 |
| ThomasEgi | there are many ways to meassure capacities | 14:47 |
| ThomasEgi | it really depends on what you deal with. | 14:47 |
| chris_99 | hmm, maybe i should get a multimeter that can do this first | 14:47 |
| chris_99 | then go from there | 14:47 |
| chris_99 | so i know roughly what i'm dealing with | 14:48 |
| ThomasEgi | while capacities in the uF range can be meassured by simply discharging them with and recording the voltage. smaller capacitances require more complex setups | 14:48 |
| chris_99 | aha ok | 14:48 |
| chris_99 | more complex being the freq. approach? | 14:48 |
| ThomasEgi | there are many. as i said. | 14:51 |
| ThomasEgi | the simplest one is simply charging or discharging. then there are a number of AC methods which aim to meassure phase-delay, use frequency modulation or amplitude modulation (like creating a low/highpass) | 14:52 |
| chris_99 | http://www.romanblack.com/onesec/CapMeter.htm | 14:52 |
| chris_99 | looks interesting | 14:52 |
| ThomasEgi | the question really is, what capacitance you want to meassure. | 14:53 |
| chris_99 | yeah i really have no idea at the moment, i'll have to test out something like that circuit | 14:54 |
| ThomasEgi | that circuit would work well down to like single-digit nF (rough guess) | 14:54 |
| chris_99 | presumably i just then need a high freq. ADC | 14:54 |
| chris_99 | with bit depth not too important | 14:54 |
| ThomasEgi | but if your capacitance is something like 40pF, things get worse | 14:54 |
| ThomasEgi | a fast ADC is not even strictly neccessary. | 14:55 |
| ThomasEgi | the lower the capacitance you meassure the more problematic the circit itself becomes. | 14:55 |
| ThomasEgi | as everything has capacities. wires, resistors, even the semiconductors itself have charges all over the place. | 14:56 |
| chris_99 | mm indeed | 14:59 |
| chris_99 | well this www.mems-issys.com/pdf/issystech5.pdf seems very interesting | 15:03 |
| chris_99 | 'A Density / Specific Gravity Meter Based on | 15:03 |
| chris_99 | Silicon Microtube Technology' | 15:03 |
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| kanzure | hmm http://bugs.winehq.org/show_bug.cgi?id=17195 | 16:12 |
| kanzure | named pipes don't work in wine | 16:12 |
| kanzure | .. or something. | 16:12 |
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| heath | https://github.com/nferraz/st :: basic stats from the cli | 17:04 |
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| kanzure | yashgaroth: what's up at the lab? | 19:40 |
| yashgaroth | genomikon presentation last night, even more underwhelming than I expected | 19:40 |
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| yashgaroth | what else...I need to form an LLC at the lab, and my company will be trashing their 80's FPLC rig so I can probably snag that | 19:46 |
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| kanzure | yashgaroth: let me know if you want blackhatbio llc | 20:09 |
| yashgaroth | gotta stay on the down-low for now, but I'll keep it in mind | 20:10 |
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| rigel | http://runningahackerspace.tumblr.com/post/43015456699/new-transhumanist-meetup | 21:23 |
| kanzure | tumblr link, probably porn | 21:24 |
| * brownies pokes gradstudentbot | 21:24 | |
| gradstudentbot | Don't you have anything better to be doing? | 21:24 |
| brownies | i don't get it. is he suggesting that transhumanists are always loafing around? | 21:24 |
| kanzure | he is demonstrating how to cut bread with a wedge | 21:24 |
| kanzure | or applying invisible butter | 21:25 |
| brownies | those explanations are not any butter than mine. | 21:26 |
| yashgaroth | the crumbs represent AI, you see | 21:28 |
| kanzure | question: | 21:29 |
| yashgaroth | or furries, I forget which | 21:29 |
| kanzure | may i cash in my crumbs for internet points? | 21:29 |
| yashgaroth | bitcoins only | 21:29 |
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| --- Log closed Thu Sep 05 00:00:16 2013 | ||
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