VygmraMGVl

6 ms·

1.
by VygmraMGVl 8d ago
Why does there need to be a thermal gradient? It seems like the action driving the actuator is the expansion of the wax due to temperature. You don't need a persistent heat flux to get that, the wax just needs enough heat warm up and c
2.
by VygmraMGVl 3mo ago
As an example of a negative result-- https://www.nature.com/articles/s41526-019-0071-6 Astronauts given two different batteries of cognitive tests showed no dose-response relationship to CO2 concentration
3.
by VygmraMGVl 3mo ago
At one point there were over 70 different token maxing dashboards as the management had a game of whack a mole trying to remove them. There definitely was encouragement from management about a year ago to increase ai usage, but once Claude
4.
by VygmraMGVl 3mo ago
The leaderboard wasn't leadership generated, it was engineer generated from internally available data. The leadership target is "impact" from ai tools.
5.
by VygmraMGVl 4mo ago
Claude opus 4.6 scores 51.9% on the same benchmark. Microsoft's result is quite good.
6.
by VygmraMGVl 5mo ago
Meta's interview process does include leetcode Hard and Medium problems (although the Hards tend to be on the easier side), but you don't actually have to write working code, just talk your way through an algorithm. I actually was
7.
by VygmraMGVl 5mo ago
It's pretty easy to scrape your own calendar events in Meta. I'm not sure about others' as I'm not a manager, but I wouldn't be surprised if it were visible as long as someone is in your report chain. (I work at Met
8.
by VygmraMGVl 1y ago
Typically, the behavior of any given metal is a mix of mechanisms so the measured behavior is fit to a curve where you fit n. So for metals the exponent is typically a decimal between 2 and 5.
9.
by VygmraMGVl 2y ago
SoundBio is a bio + chemistry makerspace in Seattle. Not BSL, though.
10.
by VygmraMGVl 2y ago
It would be interesting to see a blogpost on parameterizing a model in PyBaMM given a commercial cell. I imagine many battery engineers using simulation-based design tread over the same ground for determining parameters from literature, X-r
11.
by VygmraMGVl 2y ago
The "batteries-included" models in PyBaMM would apply to sodium batteries and lead-acid batteries (i.e. either the full Doyle-Fuller-Newman model or the Single Particle simplification). Flow batteries would probably require implem
12.
by VygmraMGVl 2y ago
This was true in 2013 as well. I've heard this has changed in the last 5 years or so, though.
13.
by VygmraMGVl 2y ago
Also probably a skin and lung irritant. Lots of people have contact allergies to macroscale silver and nanowires tend to get embedded in cells in soft tissue.
14.
by VygmraMGVl 2y ago
It can affect battery longevity. If you charge lithium ion at cold enough temperatures, you get lithium plating which rapidly degrades capacity and can lead to internal shorts and fires.
15.
by VygmraMGVl 2y ago
It's due to heat produced, gas generated from overvolting the battery, and stress gradients from different levels of charge across the battery.
16.
by VygmraMGVl 2y ago
There isn't any difference between the guano graphene and the non-guano graphene in terms of structure -- look at figures 1 and 2. Figure 2A is clearly 4 of the same spectra because thermal exfoliation in the presence of guano doesn&#x
17.
by VygmraMGVl 3y ago
Lithium is not a rare earth mineral. Typical weight fraction in ore is 0.5-8%.
18.
by VygmraMGVl 3y ago
10 years ago, Congress decided we needed to transition off of it. Large amounts of the stockpile were sold off from 2013-2018 and this is the final part of the plan. https://www.blm.gov/programs/energy-and-minerals&#x2F
19.
by VygmraMGVl 3y ago
Heads up, the danger with charging LFP at low temperature is that you will begin lithium plating. While this is a driver of degradation of LFP batteries, it's also a safety risk as lithium plating can lead to dendrite formation, intern
20.
by VygmraMGVl 3y ago
You drive current through the outer probes. The inner probes measure voltage and are not driven. When measuring non-zero resistance, you can vary the driving current to confirm the voltage you measure also varies linearly (ex thermal effect
21.
by VygmraMGVl 3y ago
I know a dev fresh out of college who became proficient in COBOL, got a govt job offer, and now is working as a lifeguard because places that hire COBOL programmers take forever to process their paperwork. Presumably he'll start his re
22.
by VygmraMGVl 3y ago
You're in an enclosed tube with lots of people, so fire is a lot worse. Most lithium ion battery fires in cabins are from loose vape batteries, probably shorting on keys or change. Some are from crushing pouch cells in tablets or phone
23.
by VygmraMGVl 3y ago
NaCl isn't bonded in water, it's ionized and dissolved. Each ion (Na+ or Cl-) is surrounded by a large number of water molecules due to the electric field of the ion.
24.
by VygmraMGVl 3y ago
Yes, that would be a membrane. There a number of membranes with larger pores that are fabricated like above, but out of polycarbonate (track etch membranes). Some people have also experimented with single and double layers of graphene with
25.
by VygmraMGVl 4y ago
You can declare a type-hint beforehand without setting the value of the variable. See: https://peps.python.org/pep-0526/#global-and-local-variable-...
26.
by VygmraMGVl 4y ago
The title says this is expanded PTFE, which seems like it wouldn't need an additional PFOTS coating. I doubt it would shed similar small molecules to a PFOTS coating as it's a different material (polymerized tetrafluoroethylene).
27.
by VygmraMGVl 4y ago
Lithium Ion batteries do burn much more readily when fully charged than when discharged -- this is because they self-discharge rapidly at elevated temperatures, which provokes an even greater reaction of the materials inside of them. Specif
28.
by VygmraMGVl 4y ago
The tax write-off you get is determined by how much the car goes for at auction. You get a receipt so you can accurately file your taxes. There's no gaming here, unless you lie on your taxes, which isn't really a tax dodge.
29.
by VygmraMGVl 4y ago
FTA: >You can shake an egg forcefully without disrupting the contents. But experiments show that if you spin one hard enough, the yoke inside will rupture even though the shell remains intact.
30.
by VygmraMGVl 4y ago
Aluminum forms a passivating oxide layer, but generally this layer is conductive enough that you can still use aluminum as an electrode, except in conditions with extreme pH.

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