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| kanzure | and https://www.reddit.com/r/Bitcoin/comments/3w6vy4/i_am_not_craig_wright_we_are_all_satoshi_satoshi/ :-/ | 00:29 |
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| kanzure | i feel like marc fawzi is pointing and laughing at me from his moderated grave | 00:32 |
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| maaku | kanzure: https://news.ycombinator.com/item?id=10709709 | 01:31 |
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| kanzure | aaaaaa | 07:18 |
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| JayDugger | That looks like a thankless job. | 08:11 |
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| cluckj | hah | 09:43 |
| cluckj | I don't see why it matters so much who satoshi is | 09:43 |
| cluckj | well...I do, but it doesn't matter at all who satoshi is | 09:43 |
| chris_99 | ...or maybe it does (so then we can steal all his bitcoins ;) | 09:44 |
| cluckj | lol | 09:46 |
| kanzure | aaaaaaaaaaaaaaaaaa | 09:48 |
| kanzure | i did *not* tell that guy that gwern was the source for the leaks. i did not say that, and i reject the notion that i would know. | 09:48 |
| kanzure | http://thenextweb.com/insider/2015/12/10/the-search-for-the-godfather-of-bitcoin-does-not-end-with-craig-wright/ | 09:48 |
| kanzure | shit what the fuck | 09:50 |
| justanotheruser | oh man, you're right in the middle of it now | 09:50 |
| kanzure | fuck this | 09:50 |
| justanotheruser | interesting that gwern has ops in your private messages | 09:51 |
| kanzure | it was #lw-bitcoin | 09:51 |
| justanotheruser | what does that even mean | 09:52 |
| justanotheruser | gwern is going to get doxxed and left for dead | 09:52 |
| justanotheruser | are there people that mad at him? | 09:52 |
| kanzure | nobody wants to be friends with someone so careless and dangerous | 09:53 |
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| kanzure | i have no evidence that gwern "called in" a raid, although i do suspect that publishing in public an accusation is likely to trigger a raid or swatting at some level | 10:01 |
| kanzure | i also never claimed to the journalist that i had any of that evidence | 10:01 |
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| kanzure | also, i never claimed to know gwern's source for the leaks, or whether gwern was the source of the leaks. i have no clue, i have no interest in that detail. i don't know why that statement is written as fact. | 10:01 |
| kanzure | "ironic, given the subject matter of the article" - sbp | 10:02 |
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| kanzure | https://twitter.com/iang_fc | 10:26 |
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| fenn | what does that even mean | 10:28 |
| kanzure | ironic to call out others getting details wrong while getting details wrong? how is that unclear. | 10:31 |
| fenn | er, i mean the broken english email "from" ian to ian | 10:33 |
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| Aurelius_Work | News media is trash, they won't report on it at 11 | 10:37 |
| fenn | oh it's sort of explained in the 7 part tweet | 10:38 |
| fenn | "for some time, CW has been victim of an extortion plot for money and other outrageous things. Also persistent hacking events. ... 5 “journalists” 2 mags and ATO fell for extortionist/hacker doxing, raced each other to disgrace." | 10:39 |
| fenn | everyone on the blocktrain | 10:46 |
| fenn | Vinay Gupta says "The first draft of the first page of my magnum opus on (digital) identity and blockchains." https://pbs.twimg.com/media/CVoFxEhWwAARr2N.png | 10:46 |
| kanzure | i'm not convinced he should be working on that. he should just shitcan the concept of identity entirely and move on to more productive things. | 10:49 |
| fenn | agreed | 10:49 |
| kanzure | fake satoshi from last night is pming me on irc at the moment. | 10:51 |
| kanzure | i hate everyone. really, i just want this planet to be blown up. is that too much to ask? | 10:51 |
| fenn | what's fake satoshi's IP | 10:51 |
| kanzure | time warner cable wisconsin 104.231.205.87 | 10:52 |
| fenn | same town autumn radtke was from? | 10:56 |
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| fenn | must be something in the water | 11:04 |
| kanzure | https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010329.html | 11:04 |
| kanzure | i think vistomail /was/ hacked at some point, although i don't remember where the evidence ofr that has gone | 11:05 |
| fenn | gmx was the one that was hacked | 11:05 |
| kanzure | oh thank you | 11:05 |
| fenn | yesterday gwern said "The documents were leaked to me, not the other way around. And judging by the parallel Gizmodo investigation, there's even multiple leakers running around stepping on each others' toes." | 11:11 |
| kanzure | right.. the way it was phrased on thenextweb made it sound like gwern was the leak. | 11:11 |
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| kanzure | although, the author of the article emailed me that precisely same quote to argue against my disclaim | 11:11 |
| Stskeeps | kanzure: idly wondering why http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-December/011936.html doesn't show up in http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-December.txt.gz | 11:11 |
| kanzure | interesting question. | 11:12 |
| fenn | it's probably a daily cron job | 11:12 |
| Stskeeps | not impossible | 11:13 |
| kanzure | should be whatever mailman default is | 11:13 |
| kanzure | check whether other emails after that one are included | 11:13 |
| Stskeeps | yeah, it seems to stop at "luke durback"'s mail, some mails before | 11:14 |
| Stskeeps | sounds like a cronjob indeed | 11:14 |
| kanzure | headers are wrong, fwiw | 11:15 |
| Stskeeps | as in, doesn't show same as in http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-December/011936.html ? | 11:15 |
| kanzure | as in spf failure | 11:16 |
| kanzure | https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010329.html | 11:16 |
| kanzure | https://www.reddit.com/r/btc/comments/3w5e7k/interesting_change_in_devs_detective_attitude/cxtob1h | 11:16 |
| kanzure | https://www.reddit.com/r/Bitcoin/comments/3w6vy4/i_am_not_craig_wright_we_are_all_satoshi_satoshi/cxu6uim?context=3 | 11:16 |
| kanzure | last link is most relevant to this question | 11:16 |
| Stskeeps | nod, spoofed | 11:16 |
| kanzure | but given current standards of "journalistic excellence" perhaps the spoofery will be sufficient to convince them -_- | 11:17 |
| kanzure | Stskeeps: see also my follow-up here, https://news.ycombinator.com/item?id=10709310 and https://www.reddit.com/r/Bitcoin/comments/3w6vy4/i_am_not_craig_wright_we_are_all_satoshi_satoshi/ | 11:19 |
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| kanzure | 11:28 <+sbp> kanzure: ah, simple! thanks! | 11:29 |
| kanzure | 11:29 -!- sbp changed the topic of #swhack to: Swhack! We are all Satoshi (except for YOU) | 11:29 |
| nmz787_i | so how's the search for that person going? | 11:29 |
| nmz787_i | did that aussie pay his taxes yet? | 11:30 |
| kanzure | you leave jack burton alone | 11:30 |
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| chris_99 | nmz787_i, i'm working on a fun problem, triangulation of ws2812b LEDs, so i can then paint my christmas tree based on a model on my computer ;) | 11:32 |
| nmz787_i | chris_99: using a camera ? | 11:32 |
| kanzure | https://www.youtube.com/watch?v=tyYyXWeZxSU | 11:32 |
| chris_99 | yeah a single camera | 11:33 |
| nmz787_i | hmm | 11:33 |
| nmz787_i | neat | 11:33 |
| chris_99 | going to get the leds to pulse out an ID | 11:33 |
| kanzure | or https://www.youtube.com/watch?v=uNxQIY-CoeQ | 11:33 |
| nmz787_i | chris_99: did you see the scrolling LED character display I worked on at the end of October? I used the same LEDs as part of a strip and matrix... I had the strip pulsing with a different color for each audio frequency bin of incoming music... and the scrolling character display changed to a graphic equalizer of the data in between messages | 11:34 |
| chris_99 | i'm not sure, linky? | 11:35 |
| nmz787_i | grrr, youtube has like 3 accounts for me and I can never remember where my videos get dumped. one sec | 11:35 |
| chris_99 | heh | 11:36 |
| nmz787_i | chris_99: https://www.youtube.com/watch?v=JAGDeKLid8A | 11:36 |
| chris_99 | cool :) | 11:36 |
| chris_99 | i got mine working on the Pi zero before they broke, so i ordered some ws2812b rather than ws2811 | 11:37 |
| nmz787_i | yeah it was a fun weekend project | 11:37 |
| nmz787_i | before it broke? | 11:37 |
| nmz787_i | you killed it? | 11:37 |
| chris_99 | yeah the leds just stopped working, i don't think i did anything wrong to it though heh, i used 5V logic, 5V power | 11:38 |
| nmz787_i | hmm, i got an RPi Zero (that's the one that is supposed to be $5 right?) | 11:38 |
| nmz787_i | but haven't used it yet. | 11:38 |
| chris_99 | yup | 11:38 |
| chris_99 | it's probably overkill for driving the leds tbh i guess | 11:39 |
| chris_99 | but it'll mean i can easily ssh and change stuff | 11:39 |
| nmz787_i | ah, yeah I used an arduino clone | 11:40 |
| nmz787_i | used the neopixel library, but wrote the character display code myself | 11:40 |
| maaku | kanzure: moderation is a thankless job | 11:41 |
| kanzure | maaku: i'm worried that attempts at heavier moderation will be perceived as a control/authority thing. but really i just want high signal. | 11:42 |
| kanzure | see https://www.reddit.com/r/btc/comments/3w5e7k/interesting_change_in_devs_detective_attitude/cxtrcp0 | 11:42 |
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| fenn | a time traveller from the future who has managed to work out where (which ip) the whitepaper was published from comes back to 2008 to meet Satoshi, and when on getting there he realises that Satoshi is nowhere to be found & is faced with the possibility of a world without Bitcoin decides to publish the whitepaper himself thereby becoming Satoshi Nakamoto. | 11:52 |
| fenn | oops should have quoted that | 11:53 |
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| chris_99 | nmz787_i, https://github.com/jgarff/rpi_ws281x | 11:54 |
| nmz787_i | chris_99: I thought those ws chips had a built in serial decoder and PWM? I thought that you just fed them a serial bitstream with color values.. | 11:58 |
| chris_99 | nah, it's that none return to zero modulation thing | 11:59 |
| nmz787_i | hmm, the neopixels are serial data driven then... | 12:05 |
| chris_99 | really? | 12:05 |
| nmz787_i | hmm, they use the WS2812B | 12:06 |
| chris_99 | yeah | 12:06 |
| chris_99 | they just rebrand them | 12:06 |
| chris_99 | and up the price | 12:06 |
| nmz787_i | wait, so adafruit and the ws company say they're serial devices | 12:06 |
| nmz787_i | but that link you sent is using the PWM driver? | 12:06 |
| chris_99 | http://www.aliexpress.com/item/1m-4m-5m-WS2812B-Smart-led-pixel-strip-Black-White-PCB-30-60-144-leds-m/2036819167.html?ws_ab_test=searchweb201556_6_79_78_77_80,searchweb201644_5,searchweb201560_10 is what i got, they're not serial devices afaik | 12:07 |
| chris_99 | where does ws say they're serial? | 12:07 |
| chris_99 | wait maybe i'm explaining poorly, you have to PWM to generate the NRZ signal | 12:08 |
| chris_99 | or you could bit bang it potentially i guess | 12:08 |
| nmz787_i | oh, I was just going off the fact that they only have 4 pins called VDD, VSS, DIN, DOUT | 12:09 |
| nmz787_i | https://www.adafruit.com/datasheets/WS2812B.pdf | 12:09 |
| chris_99 | you have to output different times for a low to a high | 12:10 |
| chris_99 | so it's not like normal serial | 12:10 |
| nmz787_i | "It internal include intelligent digital port data latch and signal" | 12:10 |
| nmz787_i | yeah I guess I meant digital data stream... | 12:10 |
| nmz787_i | as opposed to PWMing an LED directly | 12:10 |
| chris_99 | mmm | 12:11 |
| chris_99 | yeah they're sort of like a shift register | 12:11 |
| xentrac | so I laser cut a thing in MDF and I'm impressed with the results | 12:11 |
| nmz787_i | xentrac: just don't get it wet! | 12:12 |
| xentrac | what was the name of that computational technique where you define the constraints a casting needs to fulfill (support load X in direction Y at point Z, etc.) and a feasible but crude version, and then optimize it? | 12:12 |
| xentrac | yeah, I'm going to try wetting some of the pieces now to see what happens | 12:12 |
| nmz787_i | I always bad-mouth MDF... since it turns to garbage it it gets wet | 12:12 |
| nmz787_i | if it gets wet* | 12:12 |
| chris_99 | like gremlins | 12:13 |
| nmz787_i | haha | 12:13 |
| xentrac | it's not that abrasion-resistant either | 12:17 |
| xentrac | I was thinking I could maybe varnish it to make it somewhat water-resistant | 12:17 |
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| kanzure | if we need someone with mad varnish skillz let me know. heh. | 12:19 |
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| nmz787_i | kanzure: your mom? | 12:19 |
| kanzure | yeah | 12:19 |
| nmz787_i | heh, I just varnished a workbench a few nights ago and need to sand and apply a second coat soon | 12:19 |
| nmz787_i | got some plastic-fiber cloths from the dollar-store yesterday... since the 'painters cloths' i had were cotton and not lint-free | 12:20 |
| nmz787_i | not sure the plastic fiber cloths I got are going to be completely lint-free, but I hope they're moreso | 12:20 |
| xentrac | kanzure: this constraint optimizing mechanical support thing is a thing you told me about a few months ago | 12:21 |
| xentrac | and I was super excited to learn about it but now I can't find it because I can't remember the name | 12:21 |
| kanzure | gce? | 12:22 |
| kanzure | salome constraint solver stuff? | 12:22 |
| kanzure | solvespace? | 12:22 |
| kanzure | 14:58 < nmz787_i> xentrac: I think brlcad is the best, and possibly using the new python parametric constraint solver based on solvespace | 12:23 |
| kanzure | 14:58 < nmz787_i> xentrac: then dolfin and fenics for solvers | 12:23 |
| kanzure | 14:59 < nmz787_i> xentrac: https://en.wikiversity.org/wiki/CAD_to_FEniCS_example | 12:23 |
| kanzure | this seems more likely to be the thing you were thinking of | 12:23 |
| nmz787_i | but that doesn't include mechanics by default... you'd need to setup the solvers I guess | 12:24 |
| nmz787_i | if that hasn't already been done by someone else in the dolfin/fenics community | 12:24 |
| nmz787_i | (i looked for a 3D electromagnetics simulator for fenics recently but didn't find one... was searching using 'signal integrity' though, so maybe I can find better/other search terms) | 12:25 |
| nmz787_i | hmm, using 'electromagnetics' helped searching: http://fenicsproject.org/qa/5796/electromagnetic-waveguide-boundary-condition http://fenicsproject.org/qa/2694/electromagnetic-waveguide-example-from-the-fenics-book http://dx.doi.org/10.1109/MAP.2012.6309184 | 12:27 |
| nmz787_i | .title http://dx.doi.org/10.1109/MAP.2012.6309184 | 12:27 |
| yoleaux | IEEE Xplore Abstract - Using the FEniCS Package for FEM Solutions in Electromagnetics | 12:27 |
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| xentrac | I just learned about solvespace recently and it looks super awesome | 12:28 |
| xentrac | but no, I wasn't talking about a piece of software, but about a general approach to mechanical design | 12:29 |
| kanzure | describe visual appearance of thing i showed you? | 12:29 |
| kanzure | i have tags for every conversation you and i have, so if you can remember the date, i can find the conversation | 12:30 |
| xentrac | there was like a mounting bracket, maybe in a PDF or something | 12:30 |
| kanzure | youtube video? | 12:30 |
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| xentrac | and then there was an optimized version of that mounting bracket made out of a lot less steel | 12:32 |
| xentrac | I think it was a PDF paper | 12:33 |
| fenn | topological optimization using level set methods | 12:33 |
| xentrac | YES | 12:33 |
| xentrac | thank you fenn | 12:33 |
| fenn | maybe this? http://ewp.rpi.edu/hartford/~ernesto/SPR/Thomas-FinalReport.pdf | 12:33 |
| xentrac | topology optimization was the term I was trying to remember | 12:33 |
| chris_99 | i'm just looking at http://www.sciencegateway.org/protocols/cellbio/yeast/ygs.htm is there any info on how long it'd last at lower temps, like -20C? | 12:35 |
| fenn | "Topology optimization is distinct from shape optimization since typically shape optimization methods work in a subset of allowable shapes which have fixed topological properties, such as having a fixed number of holes in them. Therefore topology optimization is used to generate concepts and shape optimization is used to fine-tune a chosen design topology. | 12:36 |
| xentrac | kanzure: what's gce? | 12:36 |
| xentrac | so fenics is a thing you could use to implement topology optimization, for example | 12:37 |
| kanzure | gce is gnu constraint solver thingy | 12:37 |
| xentrac | by figuring out how good or bad a particular solution is | 12:37 |
| kanzure | gecode | 12:37 |
| kanzure | http://www.gecode.org/ | 12:37 |
| xentrac | oh interesting | 12:37 |
| xentrac | thanks! | 12:37 |
| kanzure | er, not gnu. apparently. | 12:38 |
| xentrac | I didn't even know about the minizinc challenge | 12:38 |
| kanzure | how did fenn pull that rabbit out of his hat | 12:38 |
| kanzure | wtf | 12:39 |
| fenn | i thought it was really cool so i remembered it | 12:39 |
| kanzure | that's not fair | 12:39 |
| xentrac | I thought it was really cool too, but apparently not as cool as fenn did | 12:39 |
| xentrac | heh | 12:39 |
| xentrac | it's interesting that "SICStus Prolog" got bronze in the MiniZinc Challenge last year; I wouldn't have expected it to be eligible since Prolog isn't Zinc | 12:40 |
| xentrac | or MiniZinc | 12:40 |
| xentrac | are there any reasonably hardenable metals you can reasonably electrodeposit? electrodepositing iron (which you can later case-harden) is feasible but apparently a huge pain in the ass, and I'm pretty sure you can't turn copper into beryllium copper without remelting it | 12:41 |
| xentrac | I mean the problem with electrodeposition is that you can't directly electrodeposit alloys | 12:42 |
| fenn | hardenable metals are (always?) alloys | 12:42 |
| xentrac | iron isn't an alloy | 12:42 |
| xentrac | you can case-harden it | 12:43 |
| fenn | electrodeposition doesn't deposit alloys | 12:43 |
| xentrac | you just can't heat-treat it | 12:43 |
| fenn | by case-hardening it you are doping the metal with carbon | 12:43 |
| xentrac | exactly | 12:43 |
| xentrac | which means you can cut a skeleton out of acrylic, paint it with graphite, electrodeposit iron, and then harden it to get a complicated structure of iron tubes with reasonably tight tolerances | 12:43 |
| fenn | i guess if you plate beryllium onto your copper and heat it for a long time it will diffuse into the copper | 12:44 |
| xentrac | but electrodepositing iron is apparently a huge pain | 12:44 |
| xentrac | maybe! I'd be kind of scared about plating things in beryllium too though | 12:44 |
| fenn | you probably want to use electroless nickel deposition for your first layer, not graphite | 12:44 |
| xentrac | I mean not that it is impossible but more that it's likely to kill you if you do it wrong | 12:44 |
| xentrac | you're surely correct that that would give you better tolerances | 12:45 |
| fenn | https://en.wikipedia.org/wiki/Metallic_microlattice | 12:45 |
| fenn | i think tallakahath worked in this lab | 12:45 |
| xentrac | interesting, they hardened their nickel with phosphorus? how random | 12:46 |
| fenn | they also managed to deposit various ceramics like Al2O3onto their micro-lattice structures | 12:46 |
| kanzure | she says yes | 12:47 |
| xentrac | or was that just an impurity form the electroless deposition process? | 12:47 |
| fenn | no it was intentional, alumina is very strong and the combination means you have a reasonably stiff but also very low density material | 12:47 |
| kanzure | "I didn't work on that project, tho" | 12:48 |
| kanzure | " http://pubs.acs.org/doi/abs/10.1021/nn402710j is what I was working on. So there's not a lot I can intelligently say about the nanolattices, sorry" | 12:48 |
| kanzure | .title | 12:48 |
| yoleaux | An Error Occurred Setting Your User Cookie | 12:48 |
| xentrac | no, I mean the phosphorus | 12:48 |
| xentrac | not the alumina | 12:48 |
| kanzure | "Local Relative Density Modulates Failure and Strength in Vertically Aligned Carbon Nanotubes" | 12:48 |
| xentrac | that's also pretty interesting | 12:48 |
| fenn | http://www.jrgreer.caltech.edu/home.php "The key focus of the Greer group is on creating and studying advanced materials that utilize combination of 3-dimensional hierarchical architectures and nanoscale material size effects" | 12:50 |
| xentrac | I should probably mention the giant-stiffness composite I saw the other day | 12:50 |
| xentrac | you guys might be interested | 12:51 |
| xentrac | http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.454.7583&rep=rep1&type=pdf Jaglinski, Kochmann, Stone, and Lakes 2007. A giant-#stiffness metamaterial of 10% barium titanate particles dispersed in a tin matrix with a Young's modulus of several GPa, greater than that of diamond at 1GPa, and more than an order of magnitude greater than that of the components (100 and 50 MPa); but only within a critical temperature range of about 58–5 | 12:51 |
| xentrac | Kochmann lab at Caltech | 12:51 |
| eudoxia | kanzure: i installed NanoEngineer on a chroot, works great, but for some reason the simulator's missing, so i can't do energy minimization | 12:51 |
| fenn | isn't GPa modulus normal? | 12:52 |
| xentrac | apparently diamond has a 1GPa Young's modulus? | 12:52 |
| xentrac | hmm, no | 12:53 |
| xentrac | maybe my numbers are off by three orders of magnitude? | 12:53 |
| xentrac | they did claim explicitly in the paper that it was stiffer than diamond | 12:53 |
| xentrac | diamond is about 1 TPa | 12:54 |
| xentrac | and it wouldn't be surprising if the components were 100 and 50 GPa, which would be normal numbers for metals | 12:54 |
| fenn | i'm not sure where it got messed up, in the article itself it says the components materials are 100 and 50 GPa | 12:55 |
| fenn | youngs modulus numbers are higher than tensile strength numbers so it can be confusing | 12:56 |
| xentrac | (and barium titanate is a ceramic, not a metal) | 12:56 |
| xentrac | thanks for the correction! | 12:57 |
| fenn | i guess i should retire before i make an embarrassing mistake | 12:58 |
| xentrac | no, I need the opportunity to retur nthe favor | 12:58 |
| xentrac | so apparently giant-stiffness metamaterials are feasible. I think they wouldn't have to depend on exotic ceramics, either | 12:58 |
| xentrac | because negative-stiffness structures like buckling beams are not only feasible to build but commonplace | 12:59 |
| xentrac | in some places they are called "antisprings" | 12:59 |
| xentrac | maybe you could even construct one that wouldn't be so sensitive to the temperature | 13:00 |
| fenn | auxetic foams are another interesting topic in this general area | 13:01 |
| xentrac | yes, those are cool | 13:02 |
| kanzure | hmm nanoengineer simulator is missing | 13:03 |
| kanzure | uh.. hm. | 13:03 |
| kanzure | https://groups.google.com/group/nanoengineer-dev | 13:03 |
| nmz787_i | /me who stole the simulator from the cookie jar? | 13:03 |
| fenn | who let the nano dogs out | 13:04 |
| nmz787_i | haha | 13:04 |
| nmz787_i | totally unexpected | 13:04 |
| fenn | it's past my bedtime | 13:04 |
| kanzure | nanodynamics was the thing? | 13:05 |
| kanzure | shit did i really miss something | 13:05 |
| kanzure | xentrac: did you look at http://diyhpl.us/~bryan/irc/nanoengineer/ | 13:05 |
| kanzure | like http://diyhpl.us/~bryan/irc/nanoengineer/snapshots/ | 13:05 |
| kanzure | also there's the "sim/" folder in the git repo. | 13:06 |
| xentrac | nieuw | 13:06 |
| fenn | i thought gromacs was the simulator | 13:06 |
| xentrac | is this for designing diamondoid structures? | 13:07 |
| fenn | was there a custom simulator only found in nanoengineer? | 13:07 |
| xentrac | there is a .mov | 13:07 |
| xentrac | heh, jbash is among the funders | 13:07 |
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| Urchin[emacs] | hi | 13:09 |
| eudoxia | kanzure: i tried nanodynamics and GROMACS | 13:11 |
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| xentrac | fenn: auxetic materials were the first metamaterials I heard about (other than the still-hypothetical machine-phase stuff) | 13:15 |
| xentrac | but I think giant-stiffness materials are potentially much more interesting because of the importance of stiffness in producing precision anything | 13:15 |
| fenn | yeah stiffness is important but damping is even more so | 13:16 |
| fenn | i haven't really understood how the giant-stiffness materials works yet | 13:16 |
| xentrac | the idea is that when the stress increases, the positive-stiffness component contracts, while the negative-stiffness component expands, and these cancel out as nearly as you can make it | 13:17 |
| xentrac | antisprings are already in widespread use for vibration damping in exactly the same way, but in parallel instead of series | 13:18 |
| xentrac | so instead of trying to approximate infinite stiffness you are trying to approximate zero stiffness | 13:18 |
| xentrac | see for example | 13:18 |
| xentrac | http://www.gravity.uwa.edu.au/publication/sdarticle.pdf 2004 #pdf #paper about #antisprings for seismic isolation. Clarifies that YES, an antispring has a negative #stiffness coefficient. In this case they’re combining antisprings with regular springs to cancel out their stiffness and get near-zero restoring force for small displacements. They managed to get a resonant frequency of 0.3 Hz with #maraging steel #springs (to reduce creep), | 13:18 |
| xentrac | and | 13:18 |
| xentrac | http://10m-prototype.aei.uni-hannover.de/subsystems/isolation/isolation-tables 300nm displacements at 10Hz can be measured on their hall floor during the daytime due to human activity in the city, so they built this thing with “geometrical #antisprings”, described as “a tunable spring made by a crown of curved cantilever blades compressed each against the other” (negative #stiffness coefficient constructs?) to isolate their gravity-wa | 13:18 |
| fenn | my mental model for a negative stiffness spring is the clicky top of a tamper-evident jar, | 13:25 |
| xentrac | yes | 13:26 |
| xentrac | exactly | 13:26 |
| fenn | i don't get how the isolation table works, what is this "magic wand" thing | 13:26 |
| xentrac | I don't understand that particular "crown of curved cantilever blades" thing either | 13:29 |
| fenn | the blades are just leaf springs and the taper is to make them variable rate springs | 13:29 |
| xentrac | yes | 13:29 |
| xentrac | some others are more straightforward, using Euler buckled-column springs | 13:29 |
| fenn | do you have a picture of an euler buckled column spring? | 13:30 |
| xentrac | the part I don't understand is how a crown of prestressed variable-rate springs gives you an antispring | 13:30 |
| xentrac | there are some in here I think: http://www.gravity.uwa.edu.au/amaldi/papers/Winterflood.pdf 2001 #pdf #paper about Euler (buckled-column) springs for seismic isolation, also explaining #antisprings on p.3. | 13:30 |
| xentrac | but I don't remember for sure | 13:31 |
| xentrac | oh, another thing I had forgot to mention in here is that UHMWPE turns out to be even more biocompatible than Kevlar | 13:32 |
| fenn | it's pretty inert | 13:32 |
| xentrac | yeah | 13:32 |
| xentrac | so you'd expect that | 13:32 |
| xentrac | so now I want implants | 13:33 |
| fenn | are you talking about bullet proofing? | 13:33 |
| fenn | the sheets would end up being pretty bulky because polyethylene is low density | 13:34 |
| xentrac | kind of, although I'm more worried about knives in practice | 13:34 |
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| fenn | non newtonian fluids seem more practical because they can flow to accomodate normal movement | 13:35 |
| fenn | the anti-needle gloves were made of silica microspheres and polyethylene glycol embedded in kevlar | 13:35 |
| xentrac | I didn't even know anti-needle gloves existed | 13:36 |
| fenn | plain kevlar fiber is not very effective against knives | 13:36 |
| xentrac | I don't know, kevlar gloves are pretty effective to keep you from accidentally cutting yourself | 13:36 |
| xentrac | but maybe I could use UHMWPE scales rather than pure fibers | 13:37 |
| xentrac | tomorrow I go back to Isla Maciel | 13:39 |
| xentrac | last week a friend of mine there had her son murdered on the street corner near her house | 13:39 |
| xentrac | it's her second son lost to murder | 13:40 |
| xentrac | I mean, it's not her second son, but of her sons, it's the second one who's been murdered | 13:40 |
| fenn | why would you go to a place like that? | 13:40 |
| xentrac | well, now she knows how to read | 13:40 |
| xentrac | six months ago she didn't | 13:41 |
| xentrac | she's 50 IIRC | 13:41 |
| xentrac | I think you have to understand what's happening in places like that to understand what's happening in the world, and there's also a certain kind of leverage available there that you can't get elsewhere | 13:42 |
| fenn | right, well, don't get murdered okay | 13:44 |
| xentrac | I'll do my best | 13:46 |
| xentrac | supposedly the kid had stolen a gun from another kid he would do robberies with or something | 13:47 |
| xentrac | although who knows if he'd actually stolen it | 13:47 |
| FourFire | > <kanzure> i hate everyone. really, i just want this planet to be blown up. is that too much to ask? | 13:49 |
| FourFire | sometimes I feel the same way... | 13:49 |
| eudoxia | https://es.wikipedia.org/wiki/Isla_Maciel "There are initiatives to promote tourism as a means of economic development" | 13:49 |
| FourFire | But hey, none of the present really matytersthat much :D | 13:49 |
| xentrac | yeah, apparently a French tourist couple got lost there last year | 13:53 |
| xentrac | they got robbed | 13:54 |
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| fenn | i think the "magic wand" is an eddy current damper | 13:58 |
| fenn | and the crown of blades is like those rubber "popper" toys that were popular in the 90s | 14:00 |
| xentrac | that all makes sense | 14:01 |
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| xentrac | I think they also do some active damping | 14:01 |
| fenn | or maybe they are just counterbalances | 14:03 |
| fenn | so if you manage to approximate a zero-stiffness spring, how does that get turned into "giant stiffness" | 14:06 |
| xentrac | you get zero stiffness by putting a spring in parallel with an equal and opposite antispring | 14:06 |
| xentrac | you get giant stiffness by putting them in series | 14:06 |
| fenn | hmm i'll have to think about that | 14:07 |
| xentrac | just naively putting them in series isn't enough because the system is unstable: once you drive it into the region where the antispring is an antispring, it will take up all the slack | 14:07 |
| xentrac | but apparently the Kochmann lab was able to stabilize their negative-stiffness barium titanate crystals just by dispersing them in a tin matrix | 14:08 |
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| xentrac | this shear thickening armor thing seems potentially promising but (a) I'm not sure how well it will work in practice and (b) it seems unlikely to be as biocompatible as UHMWPE | 14:49 |
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| xentrac | so I probably can't implant it | 14:55 |
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| streety | xentrac: [21:42:36] I think you have to understand what's happening in places like that to understand what's happening in the world, and there's also a certain kind of leverage available there that you can't get elsewhere <- can you expand on this? Specifically the leverage you mention | 16:22 |
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| xentrac | some of the people in Isla Maciel have problems that are really hard to solve, like cancer, diabetes, or their kids having been shot to death by the cops | 16:48 |
| xentrac | others have problems that are really hard for them to solve, but because I have a different background, they aren't always hard for me to solve | 16:48 |
| xentrac | similarly, sometimes I have problems that are really hard for me to solve, having to do with motivation and focus and whatnot, and sometimes they can help me with those | 16:50 |
| xentrac | if I had the problem of not being able to find crack, other people there could probably help me with that, but fortunately I'm not addicted to anything except caffeine | 16:51 |
| kanzure | does your motivation respond to peer pressure? because i would be willing to yell at you a lot. | 16:51 |
| xentrac | I'll keep that offer in mind :) | 16:51 |
| kanzure | beats a bur in the eye. | 16:52 |
| kanzure | *burr | 16:52 |
| xentrac | hmm, I just set myself on fire | 16:52 |
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| kanzure | most people don't recommend doing that | 16:52 |
| xentrac | they had deprived childhoods | 16:53 |
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| xentrac | there are probably better ways to do it than with alcohol gel, but alcohol gel is pretty good | 16:54 |
| xentrac | this brand is somewhat suboptimal as a Sterno replacement though | 16:55 |
| xentrac | okay. so now I have a bunch of stuff about topological optimization for this laser-cut design stuff | 16:55 |
| xentrac | this is going to be fun :) | 16:55 |
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| streety | thanks, makes sense | 18:26 |
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| wrldpc1 | Buddy of mine had a bunch of suspicious emails from someone asking him to remove a code example he had on his site so the suspect could use the code to pass his final. Presumably the teacher would do a web search to reveal the plagiarism and he wanted to prevent that. My friend declined and now his server has been hacked. What recourse is there? Anyway to find out the origin of the attack? | 19:27 |
| _andares | Uh logs? | 19:32 |
| _andares | Also just have your buddy search the Internet for the code sample | 19:32 |
| _andares | The guy might have been stupid enough to put it on github for the teacher | 19:33 |
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| bjonnh | put a comment on the code repository | 20:21 |
| bjonnh | for the teacher | 20:21 |
| bjonnh | and push that code on github and a lot of other websites | 20:21 |
| kanzure | ""Dear reader: attached on the USB stick is a signed txn moving the first 50 spendable coinbase coins from one of my addresses to another. This should be sufficient proof of identify. Additionally, below is the signature of this message using the same secp256k1 key. To anyone who can reanimate me or transfer my consciousness intact into a computer, I will pay you the sum of 1 million bitcoins via a key that I have memorized. That is ... | 20:53 |
| kanzure | ... the only part of this contract that you need to trust. Consider this an open challenge to develop the necessary technology to better mankind. Yours, Hal Finney" -- | 20:53 |
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| Taek | Hal Finney is satoshi? Brb calling up Time magazine | 21:00 |
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| _andares | It would be much easier though to just extract the memory than to revive the whole brain though, probably | 22:48 |
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| JayDugger | Good morning. | 23:16 |
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| --- Log closed Fri Dec 11 00:00:33 2015 | ||
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