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Dirt to Airplanes: Making Aluminium

maurycyz.com
19 points·by nothacking_·12 เดือนที่ผ่านมา·2 comments

Building a Metal Detector

maurycyz.com
3 points·by nothacking_·ปีที่แล้ว·0 comments

Building a Fluxgate Magnetometer

10maurycy10.github.io
2 points·by nothacking_·2 ปีที่แล้ว·0 comments

Weekend projects: getting silly with C

lcamtuf.substack.com
238 points·by nothacking_·2 ปีที่แล้ว·113 comments

Inside a $1 radar motion sensor

10maurycy10.github.io
612 points·by nothacking_·2 ปีที่แล้ว·103 comments

comments

nothacking_
·12 เดือนที่ผ่านมา·discuss
I'd bet on a bad update or configuration change. (likely one that prevents the affected systems from reaching the internet and being automatically rolled back)
nothacking_
·12 เดือนที่ผ่านมา·discuss
That's really just photography in general. Mapping an analog input (photocurrent) to a pixel brightness.
nothacking_
·12 เดือนที่ผ่านมา·discuss
> Are the bands too wide for this to work?

For wideband filters used for stars and galaxies, yes. Sometimes the filters are wider then the entire visible spectrum.

For narrowband filters used to isolate emission from a particular element, no. If you have just the Oxygen-III signal isolated from everything else, you can composite it as a perfect turquoise color.
nothacking_
·12 เดือนที่ผ่านมา·discuss
Fixed.
nothacking_
·12 เดือนที่ผ่านมา·discuss
The problem with hyperspectral imaging is that it ends up throwing away 99.9% of all the light that hits your camera. It's been done for the sun and some very bright nebulae, but really isn't practical for most of the stuff in space.
nothacking_
·12 เดือนที่ผ่านมา·discuss
That's common in high end astophotography, and almost exclusively used at professional observatories. However, scientists like filters that are "rectangular", with a flat passband and sharp falloff, very unlike human color vision.
nothacking_
·ปีที่แล้ว·discuss
Importantly, the planets aren't actually lined up nicely like on the site. Right now, Mars is ~5 times further then shown.

That's why so many people were taking pictures of Mars back in January, when it was actually possible to take see detail. Right now it just looks like a red orb.
nothacking_
·ปีที่แล้ว·discuss
Except finding '-45 dB' is frustratingly common. Have a look at this random microphone datasheet from DigiKey: https://www.sameskydevices.com/product/resource/cmm-3125at-4...

They do state the test conditions "at 94 dB SPL, 1 kHz", but don't specify the units attacked to the actually measurement. It's given as a ratio to an unspecified quantity.
nothacking_
·ปีที่แล้ว·discuss
As they should. More often then not, going into academia means horrible working conditions and horrible pay... and there's job satisfaction when your instead of doing things you like or ones enrich society, you spend most of your time in a never ending fight for grant money.

Leaving is completely logical for anyone that wants to actually do impactful research, or wants to make a living wage, and wants sane hours and sane management.
nothacking_
·ปีที่แล้ว·discuss
> 1) downloading Windows exe files from Chinese forums

VMs exist. I highly doubt the author daily drives windows XP.

> 2) the USB storage provided by network card can still contain malware

Well yes, but so can any other drivers. Downloading from the manufactures website isn't any more secure. Even signed drivers have been caught doing nasty stuff.

> 3) or can be accidentally booted from

True, but again this is quite a convoluted, noticeable, and unreliable way to compromize a system. Just injecting a handful of keystrokes will do it, and once the dead is done, the device can hide all evidence of malicious intent.

> 4) it has universal USB controller, so can become any HID device: keyboard, mouse...

This isn't wtf: a lot of devices nowadays are just microcontrollers hooked up to a USB connector. Quite a few normal USB drives can be reprogrammed to act as keyboards, and be used to get up to all sorts of shenanigans, including ones made outside of China.
nothacking_
·2 ปีที่แล้ว·discuss
Another day, another LLM generated blog post on the front page.

I'm not opposed to AI tools on principle, but why does this article exist?

It's not because the author had anything interesting to say. It's not because the AI had anything interesting to say. It's a summary of a Youtube video because... clicks or something.
nothacking_
·2 ปีที่แล้ว·discuss
Just about all humor derives from some degree of suffering. Compared what the core could have done, the three deaths from the accident are nothing. Even things that are joked about often have much higher death tolls like wars and natural disasters.
nothacking_
·2 ปีที่แล้ว·discuss
This is just a 185 stage device, but later ones would have thousands of stages, and could be chained together for even longer delays. Sample rates could also be much lower then 40 kHz as low as 6 kHz was used for echo effects.
nothacking_
·2 ปีที่แล้ว·discuss
Competition is generally good for consumers, forcing companies to make a better product then the other guy, rather then the crappiest thing people will buy.
nothacking_
·2 ปีที่แล้ว·discuss
I'm not an expert on this, but there don't seem to be any reported cases of hearing loss from sounds above 30 kHz, but there are documented cases of unpleasant effects. In any case, I'd keep some distance, just to be safe.
nothacking_
·2 ปีที่แล้ว·discuss
Easy, the natural angle of attack is determined by the elevator position. Flying upside down is totally possible with the right inputs.
nothacking_
·2 ปีที่แล้ว·discuss
Almost none of this is intuitive without hundreds of years of hindsight. The more subtle aspects of stability, such as avoiding oscillation mostly had to be determined experimentally. Then there is also the matter of actually constructing a plane, if you want it to be useful, it's going to need to be a lot more then some folded paper.

Thrust was definitely also a problem, a glider is not particularly useful unless it has a huge lift-to-drag ratio, which is only possible with modern materials and a solid understanding of airfoil design, which is a whole other can of worms.

Even things that seem so basic that we don't even think about them, like high were not at all obvious: just look at Sir George Cayley's gliders.
nothacking_
·2 ปีที่แล้ว·discuss
That's the trick, you invert the logic. If you hear the word vegan, assume the person saying it is not.