flashingleds
Joined 15 years ago
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172
Submissions
49
Member since
Feb 22
Recent submissions
Comment · 4 years ago
Comment · 4 years ago
It goes further than warnings though - at least circa 2012 using an unofficial charger (or official charger where this fragile extra wire is broken) would underclock the cpu dramatically. It happened silently, such that I didn’t realize what was happening and why my laptop was so
slow until stumbling upon a random forum post about it. I was pretty sour on Dell after that experience.
Comment · 5 years ago
Along these lines, I admit with shame that lately I’ve been switching to airplane mode before looking up or modifying a contact, because it’s not obvious to me which combination of symbol-labelled buttons will do this without initiating a phone call. I feel old.
Comment · 7 years ago
Al-foil is ubiquitous in ultra-high vacuum labs because part of the process of reaching this vacuum level involves baking the whole chamber at 120-150dC for 24+ hours. The chambers are typically made of stainless steel which has a pretty mediocre thermal conductivity. Hence the Al-foil, to ensure even heating during the bake. Since you have to bake every time the chamber is opened, it’s easier to just leave the foil on.
Comment · 7 years ago
The three people are known to you in advance (it’s your group). It was common to game this a little by saving the biggest person as the third one that had to break the bridge.
Comment · 8 years ago
Oh, really so much faster with pypy3? That would have been very nice to know when putting this together, but in any case is good to know for the future. Thanks for the tip.
Comment · 8 years ago
Author here. I really wasn’t very good at SPL-T before I changed gears to brute forcing it, so the whole strategy aspect is unexplored here. If you think you have a method that could be phrased in an algorithmic kind of way, please share! This topic is ripe for a more intelligent part 2, from me or someone else.
Comment · 10 years ago
This summary doesn't give numbers, but the journal article being discussed does. About 3e3 to 1e4 S/m for different preparations, compared with zero for untreated silk. Performed as a two-probe DC measurement, so once you factor in contact resistance it might be even better. The details are scarce, so you'd probably want to see it repeated more carefully before concluding anything.
Comment · 10 years ago
You can see in the video that he does have desoldering braid, but has chosen not to use it. Sounds like our experience differs, but personally I find desoldering braid is seldom helpful for removing parts - it tends to leave behind just enough solder to keep it stuck down, but not enough that you have good thermal conductivity to reflow it with an iron. Without using a heat gun or skillet (which he mentions) I don't know of a better way. You have a lot of experience, so if you disagree I would very much like to learn something!
Comment · 10 years ago
This is because it just got published in Nature something, the earlier open arXiv version from April is here: https://arxiv.org/abs/1604.02265
Figure 3 is absolutely spectacular, and deserves to be admired by the whole world.
A comment on the inevitable promises of revolutionized data storage: Yes the areal density is fantastically high (>500Tbit / square inch as opposed to 1Tbit/in^2 in bleeding edge HDDs / NAND flash, if I crunched the numbers correctly). But it requires ultrahigh vacuum, preparation of a clean copper crystal, dosing with copper chloride and then writing/reading with a scanning tunneling microscope, maintaining liquid nitrogen temperature.
Also a modern SSD will write about 500MB in a second, while this method would write 500MB in 240 years.
I don't mean to slag it off; we should all appreciate it for being an absolutely wonderful and awe inspiring technical feat. Just don't get carried away dreaming of the applications in your laptop/server/phone.
Comment · 10 years ago
open arXiv version from April: https://arxiv.org/abs/1604.02265
Figure 3 is absolutely spectacular, and deserves to be admired by the whole world.
A comment on the inevitable promises of revolutionized data storage: Yes the areal density is fantastically high (>500Tbit / square inch as opposed to 1Tbit/in^2 in bleeding edge HDDs / NAND flash). But it requires ultrahigh vacuum, preparation of a clean copper crystal, dosing with copper chloride and then writing/reading with a scanning tunneling microscope, maintaining liquid nitrogen temperature.
Also a modern SSD will write about 500MB in a second, while this method would write 500MB in 240 years.
I don't mean to slag it off; we should all appreciate it for being an absolutely wonderful and awe inspiring technical feat. Just don't get carried away dreaming of the applications in your laptop/server/phone.
Comment · 10 years ago
If anyone out there is looking for alternatives, last time this happened I switched to the MCP2221 from microchip. It's been in about 6 hobby projects now and I'm very happy with it. Half the price in small quantities and easier to hand solder (14SO or even DIP vs 28TSSOP)
Comment · 11 years ago
Last year when I was looking into silicene it was all very controversial and nobody seemed to have given all the necessary evidence to prove they'd made it (i.e. honeycomb lattice with the right atomic spacing AND dirac cones in the bandstucture).
Now I guess it's not only accepted but there are already devices? That's some rapid progress.
Comment · 12 years ago
I feel like the real lesson I learned here was not about time series but about reading the comments section for any discussion involving global warming
(I haven’t read the revised edition (2013) of Norman’s book, I guess he must address touchscreens)