• 4 Posts
  • 66 Comments
Joined 1 year ago
cake
Cake day: June 18th, 2023

help-circle
  • I’ve been missing an alternative to Facebook that I can use for non-anonymous planning of events and communication in hobby groups etc. and I had never heard of any of the “Facebook-type” federated stuff before!

    Now I just need to convince a bunch of people that this is viable to use without being the annoying guy…





  • thebestaquaman@lemmy.worldtoMemes@lemmy.mlPiracy
    link
    fedilink
    arrow-up
    23
    arrow-down
    1
    ·
    1 month ago

    A professor at my university tried that, but the students quite quickly made a huge fuss, got the principals office involved, and the universities lawyers informed said professor that what she was doing was illegal, and that she should stop before she got any more trouble. She stopped.




  • Saying they were always more trouble than they were worth is a bit of a miss though: They completely dominated for a period, to the point where entire columns would be redirected or kept in port if intelligence arrived saying that a certain battleship had left port and was on the hunt.

    As for the “modern” aircraft carrier: I think it will remain viable until we see a fundamental paradigm shift in how naval warfare is conducted. A carrier is at the centre of a carrier strike group, and is probably one of the most well protected places on the planet at any time, and can move at over 40 knots. I have a hard time imagining what could locate and take out an alert carrier in reasonable distance from shore, other than another carrier group.



  • In addition to cost (which I don’t have numbers for) there’s a question of efficiency: Geothermal heat it typically relatively “low temperature” heat, which makes for very inefficient power plants, especially in southern places like Italy and Greece, where there is little or no easy access to cold reservoirs (like the sea around Iceland).

    Geothermal energy is the perfect source for heating cold places in winter, or otherwise heating places you want warm, but you need quite specific geological conditions for it to be an efficient means of producing electricity.






  • Assuming

    • cylindrical human, 2m tall, 25 cm diameter.
    • air displaced from the point you teleport to is instantly moved to form a monolayer (1 molecule thick) on your surface.
    • The displacement of air is adiabatic (no heat is transferred, which will be true if the displacement is instantaneous)

    Volume of displaced air: ≈ 100L = 0.1m^3 At atmospheric conditions: ≈ 4 mol

    Surface area of cylindrical human: ≈ 1.58 m^2 Diameter of nitrogen molecule (which is roughly the same as for an oxygen molecule) : ≈ 3 Å Volume of monolayer: ≈ 4.7e-10 m^3

    Treating the air as an ideal gas (terrible approximation for this process) gives us a post-compression pressure of ≈ 45 PPa (you read that right: Peta-pascal) or 450 Gbar, and a temperature of roughly 650 000 K.

    These conditions are definitely in the range where fusion might be possible (see: solar conditions). So to the people saying you are only “trying to science”, I would say I agree with your initial assessment.

    I’m on my phone now, but I can run the numbers using something more accurate than ideal gas when I get my computer. However, this is so extreme that I don’t really think it will change anything.

    Edit: We’ll just look at how densely packed the monolayer is. Our cylindrical person has an area of 1.58 m^2, which, assuming an optimally packed monolayer gives us about 48 micro Å^2 per particle, or an average inter-particle distance of about 3.9 milli Å. For reference, that means the average distance between molecules is about 0.1 % of the diameter of the molecules (roughly 3 Å) I think we can safely say that fusion is a possible or even likely outcome of this procedure.



  • To be fair: If you live in the south, it doesn’t make much sense, but if you live a bit further north it’s the difference between getting up when the sun is a a reasonable place, or getting up in the middle of the night (winter) or the middle of the day (summer). I want it to be light out when I’m awake, not when it’s sleeping time.

    Turns out it’s easier to adjust the clock than to say “work starts at 9 in the winter and at 8 in the summer”




  • So your standpoint is that you want people to walk around making each other sick regardless of the consequences?

    I never said that. I said that if nobody ever gets sick, the consequences are much larger when disease does spread. Just check the statistics for any country post-covid lockdowns, and you will se a spike in non-covid related respiratory disease. Plenty of doctors and researchers have pointed out that the reason was very little respiratory disease during lockdowns/quarantining periods leading to low immunity in the population. I want to minimise the consequences long-term, and I’m saying that I prefer to get mildly sick once or twice a year over getting extremely sick every other year.

    And your reason for this is that you spent two weeks in bed?

    It seems like you didn’t even read the whole paragraph. As I said, what I experienced wasn’t unique, but something we could also see in statistics over hospitalisations. I’m lucky enough to only have been in bed, but for people with preexisting conditions, the same infections could have been much worse. Again: If most people get mildly sick every now and then (as we always have) we prevent outbreaks from wreaking havoc and hospitalising a bunch of people when the do happen.