lefra

7 ms·

61.
by lefra 5mo ago
In what situation would nanosecond accuracy be needed between cameras? Millisecond accuracy should be enough to get camera feeds in sync, even when looking at videos frame by frame.
62.
by lefra 5mo ago
> There's no one person that knows everything about (say) modern food production True, but it is possible to assemble a team of people that does, with backup for each person. There's also teachers and written knowledge to educa
63.
by lefra 5mo ago
Or they'll use a pair of binoculars (or a drone with a camera) to ignore the decoys and shoot at the actual ship...
64.
by lefra 5mo ago
The previous owner own my house installed these (it was mandated by law here at the time). About 90% of the time they leak after about 10 years, and mine did. I had to have the installation re-done over the roof.
65.
by lefra 5mo ago
What about big T, square/angle brackets, and braces?
66.
by lefra 5mo ago
I think I lack context to see what this is about. The line graphs are pretty though, and I'd like to understand more.
67.
by lefra 5mo ago
A french with low exposure to english would pronounce "ChatGPT" with the first "t" silent, and it sounds exactly like "Cat, I farted" in french.
68.
by lefra 5mo ago
> ((. dx powf 2.0) + (. dy powf 2.0)) sqrt)) I don't know what this is, but clearly not Lisp...
69.
by lefra 5mo ago
A GPS receiver is passive, it doesn't send any signal to the satellites. The satellite broadcast their position and what time it is from their point of view, and the receiver computes its position from that. Also, there are now several
70.
by lefra 5mo ago
You can't, because all amplifiers oscillate (except when you need an oscillator).
71.
by lefra 6mo ago
My university made us use really crappy power supplies and dev boards. Nothing worked unless you first put a large bulk capacitor on the power supply's output, and small capacitors close to the components. Also I got bitten by parasiti
72.
by lefra 6mo ago
For approximative simulation, any SPICE simulator works. You'll need to know your capacitors parasitics and power supply output impedance, find a typical via's impedance, and manually compute traces impedances and board capacitanc
73.
by lefra 6mo ago
> Every fan doubles your base points Did I miss it, or are the "base points" never explained?
74.
by lefra 6mo ago
Fibers are not transparent enough in visible. I found about 10dB/km (to be compared with 0.2 dB/km around 1550nm) [0]. This means that after every km the light intensity is divided by 10, which is completely impractical for teleco
75.
by lefra 6mo ago
A first-year physics teacher once told the class something that stuck with me (paraphrasing): "Nothing is big or small by itself. I want you to always follow these words with 'compared to ...'".
76.
by lefra 6mo ago
I bought this kind of insurance for my PhD (Dell laptop, same 24 hours technician on site guarantee). Although quite expensive, I don't regret it: my screen and motherboard got replaced about two years in.
77.
by lefra 6mo ago
People merging have right of way only on the parisian périphérique. On all other motorways in France, the merging cars must yield. It is common courtesy to move over or match speed so they can merge more easily, but that's not the law.
78.
by lefra 7mo ago
I'm the perfect client for an electric car (I can charge at home, and 99% of my trips are less than 100km). I want one even. I still use my old ICE though, because the price of vehicles went through the roof those last years, which mea
79.
by lefra 7mo ago
In C, int may be as small as 16 bits You may get 32 bits (or more) but it's not guaranteed. I don't see how you get a memory overflow though? I'd be surprised if a compiler with -Wall -Werror accepts to compile this. Trying t
80.
by lefra 7mo ago
Yes, it's one multiplication in both cases. Multiplying/dividing by 1 million is way easier than by 86400 though.
81.
by lefra 7mo ago
There's a trivial solution to this: IDs should be provided by the government for free.
82.
by lefra 7mo ago
No need for ML. This already exists, the keyword to look for is "spectral rendering". To add to the general thread: the diverse color spaces are there to answer questions that inherently involve how a typical human sees colors, so
83.
by lefra 8mo ago
As an ESL I'd say it depends on the native language of who's speaking. I'll have no trouble with a thick spanish, italian or romanian language (I'm french), but indians speaking english are completely incomprehensible to
84.
by lefra 8mo ago
Undefined Behavior
85.
by lefra 8mo ago
> a year to fire people even when they don’t show up In what country? I just checked, in France it's 15 days. The employer can ask to be paid the notice period, and the employee won't get unemployment benefits.
86.
by lefra 8mo ago
Blue LED don't use phosphorous, their spectrum is a few nm wide, just like other colors. I wouldn't bet on the spectral quality of a random screen. OLED might be okay, but other technologies use filters in front of a white light,
87.
by lefra 8mo ago
Interesting, I can only see the bands when holding my fingers very close to my eye, and _not_ focussing on it. If I hold my fingers far enough to be able to focus, I don't see them. Maybe my eyesight is not good enough. Focussing on a
88.
by lefra 8mo ago
There's several ussues with this argument: - If the interference pattern was explained by diffraction by a semi-infinite plane, why don't I see it when using only one finger? I only see a blurry shadow. The second finger is needed
89.
by lefra 8mo ago
Changing the PCB for a known-good one: $10 + maybe half an hour of low-skill work. Changing the failing component: maybe a few minutes, probably a few hours of an electronics engineer that's familiar with the design (plus his expensive
90.
by lefra 8mo ago
To get single photons, you just need to stack up enough stained glass infront of a light source. That's been acheivable for aeons (the photon will go through at random time though). The difficult part is single photon _detectors_, they

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