--- Log opened Sat Oct 31 00:00:02 2020
00:02  * L29Ah considers DIYing an ultrasonic humidifier to avoid paying $400 for a factory-made one
00:02 < nmz787> personally I have an FPGA goal of making a PCI card form-factor to act as a logic analyzer and thus bus sniffer, to help me reverse engineer a (presumably) PCI video capture and scan generator card used on my FIB
00:03 < L29Ah> i have ft2232h as a logic analyzer
00:03 < L29Ah> someday gotta switch to some usb3 thing as usb2 is very limited
00:03 < nmz787> I had the opportunity to get an industrial PCI bus sniffer, but it ran something like Windows 3.1, or worse
00:04 < nmz787> yeah those ftdi chips are pretty nice for a variety of serial stuff
00:04 < L29Ah> did you mean: PCIe?
00:06 < nmz787> no
00:06 < nmz787> my FIB PC runs Win XP
00:07 < nmz787> this was a fun workshop I participated in, using an FTDI chip to bypass the login permission on a raspberry pi https://securinghardware.com/training/jtag/
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01:26 < nmz787> "Are there not "glass printing" set ups? There are metal ones and the familiar plastic ones, Why not glass?"
01:26 < nmz787> juri_: ^
01:27 < nmz787> from https://groups.io/g/Microscope/message/92766
01:27 < fenn> there was an artsy thing at MIT with huge layer heights
01:28 < nmz787> oh, and the one using solar and fresnel lenses
01:28 < fenn> that was just sand so not technically glass?
01:29 < nmz787> hrmm, well, is that because there'd be unmelted/insolubles?
01:29 < fenn> because it's not an amorphous alloy, just melted silica
01:30 < nmz787> https://youtu.be/ptUj8JRAYu8?t=171
01:30 < nmz787> kinda sounds like bacon frying
01:30 < nmz787> or rain
01:31 < nmz787> fenn: what's the difference between melted silica and glass made from silica?
01:31 < nmz787> aren't they both silicon dioxide?
01:31 < nmz787> I doubt sand would crystallize very well
01:31 < fenn> i think the pure silica remains crystalline when solidified
01:32 < fenn> it isn't clear and will wear away more quickly(?)
01:32 < nmz787> I think I know a hiking trail that had a big screen TV that someone had dumped down a hill from a road above
01:32 < nmz787> (big fresnel lens source)
01:33 < fenn> there's a lot of ancient artifacts that have devitrified and the phases separated, leading to parts of it dissolving away
01:33 < nmz787> hmm, I wonder if that was due to inhomogeneity
01:34 < nmz787> like one section that was more highly "doped" was more/less susceptible to geochemical wear
01:34 < fenn> yeah modern glasses are much better in just about every way
01:35 < fenn> but a lot of it is just being buried underground for thousands of years where water can chemically attack it
01:36 < fenn> .title http://youtube.com/embed/IvcpbtpWpGY
01:36 < saxo> MIT Made A 3D Printer That Uses Glass - YouTube
01:37 < fenn> .title https://www.nature.com/articles/nature22061
01:37 < saxo> Three-dimensional printing of transparent fused silica glass | Nature
01:37 < fenn> (two separate approaches)
01:39 < nmz787> ooo, that one is much nicer in terms of resolution and cleanliness
01:44 < fenn> as far as i can tell, there's not really a good reason why you can't just buy a FDM glass printer
01:45 < fenn> these are not magically hot temperatures
01:48 < fenn> even if it required a tungsten tip and argon atmosphere, it would still be industrially achievable
01:48 < fenn> and then there's laser sintering of powders, although the glass would have to be IR opaque in order to be heated by the laser
01:51 < nmz787> well, would it?
01:51 < nmz787> I wonder if that sand guy ever tried
01:52 < fenn> i'm reading about glass opacity. it seems that it's transparent in near IR but not far IR
01:52 < nmz787> I mean, there must be some wavelength out there... unless maybe it was all impurities that helped him out
01:52 < nmz787> hmm, what is the cutoff wavelength?
01:52 < nmz787> or inflection point
01:54 < fenn> there's a dip at 3 micron and falls to zero at 5-8 micron depending
01:55 < fenn> i dunno there are a billion types of glasses and nobody writes technical articles about normal everyday things anymore
01:55 < nmz787> hmm, so a CO2 10 micron laser might work?
01:55 < nmz787> are you saying 0 transmission?
01:55 < nmz787> or 0 abs?
01:55 < fenn> i think it would be easier to try it than to try to look up the answer
01:55 < fenn> 0 transmission
01:56 < nmz787> hmm, yeah... maybe some lab glass
02:03  * fenn sighs
02:03 < fenn> here's the best i could find
02:03 < fenn> http://archivesmse.org/api/files/view/122247.pdf
02:07 < fenn> wavenumber 2750 cm^-1 would be 3.6 micron right?
02:07 < fenn> anyway it looks like it absorbs at 10 micron, more or less.
02:24 < nmz787> https://www.ebay.com/itm/Reflective-Powder-Glass-Beads-Mil-Spec-1-50-pounds/153854637083
02:25 < nmz787> https://www.ebay.com/itm/1-Gallon-Aerosil-200-fumed-silica-powder/322048699716
02:25 < nmz787> or maybe some fiberglass insulation, that would be cool, and I have some
02:26 < nmz787> https://www.youtube.com/watch?v=WWrUbVvn7Ks
02:26 < nmz787> .title
02:26 < saxo> Laser vs Fiberglass Insulation - YouTube
02:28 < nmz787> " Fiberglass Emits fumes It's a mix of two materials that cant' be cut. Glass (etch, no cut) and epoxy resin (fumes) "
02:28 < nmz787> from http://wiki.atxhs.org/wiki/Laser_Cutter_Materials
02:28 < nmz787> guess it has epoxy
02:31 < nmz787> https://96bda424cfcc34d9dd1a-0a7f10f87519dba22d2dbc6233a731e5.ssl.cf2.rackcdn.com/fmstriping/pdf-s/Paint_Specs_-_Glass_Bead.pdf
02:31 < nmz787> " Type I - Low Index of Refraction recycled glass (fire-polished process)"
02:31 < nmz787> Type II - Deleted Type                 III - High Index of Refraction Type                     IV - Low Index of Refraction direct melt glass (molten glass kiln process)
02:32 < fenn> doesn't seem that hard to make a ball mill to grind glass into powder
02:33 < fenn> they are loud though
02:34 < fenn> the fiberglass they're referring to there is like printed circuit boards
02:34 < fenn> not house insulation
02:34 < nmz787> oh
02:35 < nmz787> derp, I just typed "sudo apt insulation ddd"
02:36 < fenn> the stuff in the video looks more like rockwool to me, which is basalt fiber
02:37 < fenn> heh your comment on the 11 year old video
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03:16 < juri_> nmz787: MIT's work is the only stuff in that field that i know of.
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04:12 < fenn> http://i.imgur.com/8wstgoa.jpg predictions that have come to pass (mad magazine march 1967)
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09:48 < fenn> .title http://artstation.com/artwork/6aag5w
09:48 < saxo> Attention Required! | Cloudflare
09:49 < fenn> "Humanzee"
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10:29 < kanzure> "Windows Kernel cng.sys pool-based buffer overflow in IOCTL 0x390400" https://bugs.chromium.org/p/project-zero/issues/detail?id=2104
10:31 < kanzure> elsewhere: "In a distributed network where each source is an independent computer you can easily perform distributed entropy generation by using commitments of the inputs while they're still secret, but you can't use that against a malicious chip inside your own computer as it would already know all inputs. [..] However, we can introduce another recent development, by using a VDF - verifiable ...
10:31 < kanzure> ...delay functions, a type of function similar to timelock puzzles where the output takes a certain minimum amount of time to solve for. So instead of using classical hash function commitments, the input value to feed into the CSPRNG becomes the output of the VDF:s derived from each source's generated seed (note, using a type of VDF where even the generator don't know what the output will be in ...
10:31 < kanzure> ...advance). We can then make the CSPRNG sample inputs from each source on a schedule (using short contribution time windows) and creating a VDF based on the inputs, and then using the final output of the VDF to reseed the CSPRNG state."
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10:43 < gnusha> https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=4b273423 Adam Jonas: add bitcoin scipt presentation with jnewbery >> http://diyhpl.us/diyhpluswiki/transcripts/chaincode-labs/2020-04-08-john-newbery-contracts-in-bitcoin/
10:43 < gnusha> https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=21fd25c2 Bryan Bishop: Merge pull request #173 from adamjonas/add-script-jnewbery >> http://diyhpl.us/diyhpluswiki/
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12:03 < lsneff> Trying to get a simple sinwave output from an fpga
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--- Log closed Sun Nov 01 00:00:03 2020