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Cake day: June 11th, 2023

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  • There’s room for batteries in the rail industry.

    Diesel electrics rely primarily on dynamic braking. To save wear and tear on friction brakes, they convert kinetic energy to electrical, and then to heat in a giant resistor bank.

    Add a couple battery cars, and dynamic braking becomes regenerative braking.

    Theoretically, you could back feed the grid with that electrical energy, but if you do that, the train’s primary braking system is now dependent on a connection to the grid, and that doesn’t seem like a particularly good idea to me. All of the “stop” systems need to be far more reliable than the “go” systems.





  • Long shot, but does anyone know of any mapping app where you can easily project a bearing/azimuth line, or a point a given bearing and distance from another point?

    The only app I’ve found so far that can come close to what I need is Backcountry Navigator, which has a terrible UI. Everything else seems to be focused entirely on GPS navigation from where you are now to a known destination; I have yet to find one that allows even basic triangulation, to be able to identify the location of an observed object.




  • Rivalarrival@lemmy.todaytoLinux@lemmy.mlThe Best way to switch to Linux is to NOT
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    2 months ago

    Fuck all that.

    Install Linux, any flavor. Install virtualbox, and set up a Windows VM. Go ahead and install any of your windows bullshit on that VM. That’s your crutch, your failsafe: a windows instance that you don’t have to leave Linux to access.

    Save snapshots before and after any changes, so if/when it goes to shit, you can roll it back to where it was still working.


  • Well, yes and no.

    In geometry, 15, 30, 45, 60, 90, 120, and 180 degrees are all important, commonly occurring angles. They can be represented as 1/24, 1/12, 1/8, 1/6, 1/4, 1/3, and 1/2 of a circle. Trying to represent these angles on a 10-degree circle, most would have infinitely repeating decimals, which would make math involving them extraordinarily ugly and complicated. You can’t represent the angles of an equilateral triangle without repeating decimals. (1/6 of a circle, or 1.667 “degrees”) You can’t even represent the angles of a square without a fractional part. (1/4 of a circle, or 2.5 “degrees”)

    Dividing the circle into 360 degrees gives us numbers that are simpler and cleaner to use in base-10 mathematics. The 360-degree circle is a layer of abstraction for eliminating repeating decimals when referring to these common angles. Decimal is such a pain in the ass in geometry that stacking a sexagesimal layer between the unit circle and the number system was the most feasible way to do it.

    A base-12 number system would not need such an abstraction. On a 12-degree circle, these common angles would be 0.5, 1, 1.5, 2, 3, 4, and 6 degrees. A 24-degree circle (12-degree half-circle) would allow us to represent each of these with no radix point (the “decimal point” in a non-decimal number system)

    Basically, if we had evolved with 6 fingers on each hand instead of 5, mathematics would be far more elegant. We would have needed to memorize a completely different multiplication table with two additional digits. On this table, 3 * 4 = “10” instead of 12, 6 * 2 =“10” instead of 12, and 2 * 3 * 4 * 6 = “100” instead of 144. The duodecimal expansions of π, e, √2, and other irrational constants would be different, but the concepts would be consistent.

    An alien who grew up doing base-12 math would look at our base-10 system like we would look at the poor bastards who used a base-7 number system.


  • The purpose of sex should be defined by the participants, not by third parties. Government (public, third party) interest in the private act should be limited to protecting the participants from fraud, undue influence, unexpected diseases, unexpected pregnancies, violence… Basically, so long as everyone involved in the act is aware and freely agrees to the purpose, the actual purpose is functionally irrelevant.

    Sex work is work.

    I can see regulations against establishing an employer/employee working relationship, and instead mandating a private contractor relationship: an employee can disciplined or fired for failure to perform, or for refusing to serve the employer’s customers; a contractor can pick and choose their own clients.

    The right of assembly; the freedom of association should broadly protect mutually consensual activities.