He wanted a 30 min TIMER not a 30 min cook.

https://www.angryflower.com/513.html

That makes me think of the chinese guys that took cash from the bank they worked at to buy lottery tickets. The idea was to use the winnings to pay back the money and keep the rest.

They got lucky and it worked the first time. Then they decided to try again and lost.

https://en.m.wikipedia.org/wiki/Agricultural_Bank_of_China_robbery

For ntsc vhs players it wasnt a component in the vcr that was made for copy protection. They would add garbled color burst signals. This would desync the automatic color burst sync system on the vcr.

CRT TVs didn’t need this component but some fancy tvs would also have the same problem with macrovission.

The color burst system was actually a pretty cool invention from the time broadcast started to add color. They needed to be able stay compatible with existing black and white tv.

The solution was to not change the black and white image being sent but add the color offset information on a higher frequency and color TVs would combine the signals.

This was easy for CRT as the electron beam would sweep across the screen changing intensity as it hit each black and white pixel.

To display color each black and white pixel was a RGB triangle of pixels. So you would add small offset to the beam up or down to make it more or less green and left or right to adjust the red and blue.

Those adjustment knobs on old tvs were in part you manually targeting the beam adjustment to hit the pixels just right.

VCRs didn’t usually have these adjustments so they needed a auto system to keep the color synced in the recording.

Where I worked we had a very important time sensitive project. The server had to do a lot of calculations on a terrain dataset that covered the entire planet.

The server had a huge amount of RAM and each calculation block took about a week. It could not be saved until the end of the calculation and only that server had the RAM to do the work. So if it went down we could lose almost a weeks work.

Project was due in 6 months and calculation time was estimated to be about 5 1/2 months. So we couldn’t afford any interruptions.

We had bought a huge UPS meant for a whole server rack. For this one server. It could keep the server up for three days. That way even if wet lost power over the weekend it would keep going and we would have time to buy a generator.

One Friday afternoon the building losses power and I go check on the server room. Sure enough the big UPS with a sign saying only for project xyz has a bunch of other servers plugged into it.

I quickly unplug all but ours. I tell my boss and we go home at 5. Latter that day the power comes back on.

On Monday there are a ton of departments bitching that they came in an their servers were unplugged. Lots of people wanted me fired. My boss backed me and nothing happened but it was stressful.

Pretty specific use case. A normal OS handleds time slicing and core assignment for processes and uses it’s judgement for that. So at any time your process can be suspended and you don’t know when you get your next time slice.

Same with when you make wait calls. You might say wait 100ms but it may be much longer before your process gets to run again.

In a real time OS if you have real time priority the OS will suspend anything else including it self to give you the time you request. It also won’t suspend you no matter how long you use the core.

So if you need to control a process with extreme precision like a chemical manufacturing process, medical device, or flying a rocket where being 10ms late means failure they are required.

However with great power comes great responsibility. You need to make sure your code calls sleep frequently enough that other tasks have time to run. Including things like file io or the gui.

Cool. I remember having to use Red Hawk Linux years ago. It’s a real time variant of Red Hat. It was such a pain to get the dependencies workin on it.

The solution for this is usually counter training. Granted my experience is on the opposite end training ai vision systems to id real objects.

So you train up your detector ai on hand tagged images. When it gets good you use it to train a generator ai until the generator is good at fooling the detector.

Then you train the detector on new tagged real data and the new ai generated data. Once it’s good at detection again you train the generator ai on the new detector.

Repeate several times and you usually get a solid detector and a good generator as a side effect.

The thing is you need new real human tagged data for each new generation. None of the companies want to generate new human tagged data sets as it’s expensive.

Yeah. The thing that made me “get” quaternions was thinking about clocks. The hands move around in a 2d plane. You can represent the tips position with just x,y. However the axis that they rotate around is the z axis.

To do a n dimensional rotation you need a n+1 dimensional axis. So to do a 3D rotation you need a 4D axis. This is bassicly a quat.

You can use trig to get there in parts but it requires you to be careful to keep your planes distinct. If your planes get parallel you get gimbal lock. This never happens when working with quats.

No. It’s more what the previous poster said about encoding rotation. It’s just not a xyz axes. It’s current, charge, flux as axes. The trig is how you collapse the 3d system into a 2d or 1d projection. You lose some information but it’s more useful from a spefic reference.

Without complex numbers you can’t properly represent the information.

Yeah a good friend of mine has a PHD in math. I asked him how he would describe math. His answer was a set of rules for dealing with numbers. What’s important is how useful the rules are.

Yup. When you have a circuit that is not purely resistive the inductive or capacitive load causes the voltage and current to not be in phase. It looks like ohms law is being violated. However the missing part of the energy is in the imaginary component to be returned latter.

That’s why they loaned him the money. Most of his wealth is Tesla stock. He either needed loans or to sell a bunch of stock.

The first movie I saw was The Muppet Movie. First run in the theatre.

He bought twitter because he was trying to do a pump and dump with the stock. Then the SEC said we warned you once you better be serious this time. He decided buying twitter for a massive premium was better then possible prison time.

In Africa because of the large number of languages they put pictures of what’s in the package on the label. Gerber baby food had some issues when it first sold in Africa.

And it worked before streaming came around. Now cable subscriptions are in free fall and they don’t know what to do.

Actually it’s the name for a mix of vinegar, garlic, and herbs that was a home remedy to help prevent the plague.

(i) Peaches. Any firm yellow variety of the species Prunus persica L., excluding nectarine varieties, which are pitted, peeled, and diced, not less than 30 percent and not more than 50 percent.

(ii) Pears. Any variety, of the species Pyrus communis L. or Pyrus sinensis L., which are peeled, cored, and diced, not less than 25 percent and not more than 45 percent.

(iii) Pineapples. Any variety, of the species Ananas comosus L., which are peeled, cored, and cut into sectors or into dice, not less than 6 percent and not more than 16 percent.

(iv) Grapes. Any seedless variety, of the species Vitis vinifera L., or Vitis labrusca L., not less than 6 percent and not more than 20 percent.

(v) Cherries. Approximate halves or whole pitted cherries of the species Prunus cerasus L., not less than 2 percent and not more than 6 percent, of the following types:

(a ) Cherries of any light, sweet variety;

(b ) Cherries artificially colored red; or

(c ) Cherries artificially colored red and flavored, natural or artificial.

Provided, That each 127.5 grams (4 1/2 ounces avoirdupois) of the finished canned fruit cocktail and each fraction thereof greater than 56.7 grams (2 ounces avoirdupois) contain not less than 2 sectors or 3 dice of pineapple and not less than 1 approximate half of the optional cherry ingredient.

(3) Packing media. (i) The optional packing media referred to in paragraph (a)(1) of this section, as defined in § 145.3 are:

(a ) Water.

(b ) Fruit juice(s) and water.

(c ) Fruit juice(s).

From https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=145.135

My grandfather was an anthropologist and had a human skull. He had some paperwork that showed how it wad obtained. When he died one of my aunts inherited it.