Do you have details on this? The (non-new) system is (At least in the US), a piddle pack. It's a thick plastic bag that folds flat, filled with kitty litter. Turns into pee gel. That's for men. The women's ones are more complicated, and have electrical pumps.
Pretty sure astronauts do too. I remember the weird astronaut love triangle incident where some astronaut lady who was in love with some other astronaut drove nonstop cross-country with apparently a BB gun and wearing a diaper to do God knows what to the guy. It was explained that wearing a diaper during spacewalks was routine for astronauts, so it probably seemed like a reasonable and convenient thing to do for her, rather than crazy and outlandish as it seemed to most regular people.
With solid motors lower in the atmosphere with high velocity it's often optimal to delay second stage ignition so that your sustainer motor isn't working against as much atmosphere. So, kinda Max-Q issues, but for performance reasons.
I love these kind of inadvertent measurements. One of my favorite examples is that a sufficiently accurate IMU can get you relatively accurate longitude measurements from the Coriolis effect.
The earth’s surface closer to the poles has less distance to travel for any rotation than the surface closer to the equator. As a result the inertial navigation systems of long distance systems must be adjusted. Iirc, this is also the case for artillery firing computations.
Coriolis corrections are thrown into sniper ballistic calculations, too. Not a huge effect in most conditions, but not zero, and there have been a lot of long shots in the past two decades.
That's the same principle used by cheap solder stations to regulate the tip temperature without employing a thermal sensor: they measure the heater resistance, presumably during the off state of the PWM signal that drives the heater. In that case the measurement is less accurate than using a real sensor, still good enough for cheap solder stations where a few degrees don't make a big difference.
Why would they do it during the off state? If they know the voltage and can measure the current that they're driving it with -- or vice versa -- they can use Ohm's law to calculate the resistance.
Interesting. If the voltage across the speaker voice coil can be sampled with enough sensitivity at a fast-enough rate, you have an undocumented microphone.
Would this also be true for electrostatic speakers as well? Though would probably would require greater gain/amplification or, potentially the application of some kind of bias voltage for the capacitive diaphragm of the speaker.
Just speculation based on the shared operating principal with condenser microphones
With bias power, I think an electrostatic loudspeaker turns into a condenser microphone (a thing that provides varying capacitance in response to changes in pressure).
I don't think that electrostatic loudspeakers all require bias power, so it's not quite as simple as using a dynamic loudspeaker backwards is.
It is a neat idea, though. A big, flat-panel microphone would be interesting to play with.
You can use a window or any large panel as a microphone without even touching it by observing its vibrations.
You can bounce a laser off it, or even go fully passive using a camera with some sensitivity tricks: I recall a paper that reconstructed a remote conversation by watching a houseplant through a window.
Others who know that better than me and commented but... First time I read that, as a kid, here was I plugging my headphones into the input jack of my parents' soundsystem and, sure enough, it worked as mic (although at as super ultra low volume but I clearly remember it worked).
I think the most you can tell from an IMU or gyro is that there is a change in velocity in a direction aligning with East-West when there is a change in location and that the change in velocity is greater when the location changes in line with North-South. The change in velocity would be greater as one approaches the poles and lesser at the equator.
Thought experiment: if I zeroed my IMU at the North pole and traveled in a straight line away from the pole along longitude zero, following the guidance of the IMU. By the time I got to 45° latitude I’d be traveling Westward at 1,180 kph (.95 Mach) to keep the IMU at zero.
The flat earther used a fibre optic gyro. You don't "zero" it, it continuously outputs a measurement of its own angular rate around it's sensitive axis. For a 3-axis gyro placed still on earth, it will read about 15 degree/hour around wherever the axis of earth is oriented.
I believe this is one of the initial steps an aircraft INS uses to find north while it is aligning, but it's been too long since I had aircraft systems theory in the front of my brain.
Yes, from earth rotation the INS could figure out true north if the latitude is known. Or figure out the latitude if current heading is known. But normally it's aligned with a starting position from pilot input or GPS.
As I recall, it's a combination of things all happening at once, to include using last known location at shutdown, GPS inputs (if available) and inertial inputs.
There were various workarounds you had to use in the Navy, where the ship has not only usually moved from the last place the jet thought it was, but it's generally moving as the jet tries to re-align itself. GPS made things easier, and there wasn't a whole lot of thinking involved, but it always took the jet a bit more (or a lot more depending on model) thinking to get a stable platform underway.
If you are at an airport you will sometimes notice large signs giving Longitude and Latitude of the individual stands at an airport. These are used to give the initial position to the INS via the FMS. Of course these are now all built into the database these days so are only used (if at all) for gross error checking.
Dereferencing just gets whatever the value is of that data type that is at the memory location in the pointer. That memory location is all the data that is in that pointer, all other data on how to use it is in the compiled-in type. the length isn't stored unless you manually store it.
Thanks for the recommendation, I like how they're adapting the pivoting head from the cartridge razors to the ecosystem of the safety razor. I've been using the Henson Razor, which tackles the safety razor skill issue by fixing the angle of the blade when it cuts. I've been pretty happy with it, but now you're making me want to try the one you've shared.
After I decided to start shaving, I tried a few different razors. The benefit of the cartridge razor is that it requires less skill than the safety razor. The pivoting head puts it at the right angle every time. The downside, however, is the increased cost and packaging. There's also the problem that all the razor cartridges are proprietary and you need a new handle for each different blade set. I didn't like that,so I tried using the older safety razor that I had been using for trimming my neck when I had a beard. I ended up cutting myself a lot, especially around the chin. If that was what safety was, I'd shudder to see what I'd look like with a straight razor! I was still looking for something better, so after I had been brainwashed by YouTube sponsor segments for a few months, I finally caved and bought the Henson Razor in the hope its capabilities matched the advertisement. It's a finely machined safety razor, but the craftsmanship and tolerances aren't what separates it from the regular ones: it's the fact that they've designed it in a way that removes the skill requirements. The cutting angle is built in so you don't have to precisely control the pressure and angle of your cutting strokes. I was half expecting it to be a gimmick but I ended up falling in love with the design. I ended up buying a big sampler of razor blades and I've been enjoying trying all of them. Anyways, actually improving products are out there, you just have to look.
I'd also recommend Experimental Fat Loss, although some of his stuff can be a bit ranty. He's got good data and experiments, though, which is why I recommend him. Notably, he cured his non-24 with his diet. https://www.exfatloss.com/p/losing-43lbs-in-144-days-on-ex15...
Thank you for that explanation, I was confused as to what was happening with the multiple decoders. That's a wild way to implement a processor front end.
