arghdos's recent activity

  1. Comment on Hydrogen cars have gotten a lot of hate lately, and only some of that is deserved in ~tech

    arghdos
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    In the "technology is ready for deployment" state, efficiency really does matter even for renewables. If you have a fixed energy budget, for a less net efficient generation process, you have to...

    Again, my point is that if its generated from a renewable resource, especially if the wind or solar power would otherwise be curtailed, then I don't think it really matters if one pathway is more efficient.

    In the "technology is ready for deployment" state, efficiency really does matter even for renewables.

    If you have a fixed energy budget, for a less net efficient generation process, you have to build more renewables (which then requires more extraction, manufacturing, etc., and all the fun that comes with that) just to meet the demand.

    Alternatively, you must reduce energy use, which ... is hard, but should be pursued regardless.

    I totally agree though that the beginning of a technology is not the time to quibble about where the efficiency is though. If we had, Solar would still be < 1% efficient.

    2 votes
  2. Comment on Hydrogen cars have gotten a lot of hate lately, and only some of that is deserved in ~tech

    arghdos
    (edited )
    Link Parent
    I should have been clearer (but it was late, and I was on my phone :P) -- my point is more that you can't decouple the generation efficiency, particularly for renewable electricity generation...

    did not include the efficiency with which the electricity was first generated (which is irrelevant in this conversation

    I should have been clearer (but it was late, and I was on my phone :P) -- my point is more that you can't decouple the generation efficiency, particularly for renewable electricity generation specifically because without redesign of the grid, you need energy storage solutions in order for renewables to actually meet power demand when the source is not generating.

    So either: you have a fossil-fuel based generation mechanism, which can give some efficiency at cost of CO2 emission, but reliably produce power, or you need to have (something) like "pump water up a hill", "use LHTES to store solar thermal energy", "ludicrously large batteries", etc., etc.

    Whereas, the generation of hydrogen itself is the energy storage mechanism. Granted, if the hydrogen generation is say 1% efficient, maybe it would be better net efficiency to go with renewables + an energy storage mechanism. But, as we've seen with Solar -- the efficiency, cost, and accessibility of a technology can wildly improve as it starts to catch on.

    /u/dubteedub said it well, I think

    2 votes
  3. Comment on Hydrogen cars have gotten a lot of hate lately, and only some of that is deserved in ~tech

    arghdos
    Link Parent
    This discounts the efficiency with which the electricity was made, transmission and storage. If you’re going full renewable generation than maybe we don’t care, but if it’s some large scale...

    From electricity generation to your car is roughly 70-90% efficient, vs from power to hydrogen, compression, filling, and going back to electricity again you're looking at 25-35% efficiency.

    This discounts the efficiency with which the electricity was made, transmission and storage. If you’re going full renewable generation than maybe we don’t care, but if it’s some large scale top-of-the line power plant, that might be 60%. So you’re looking at 70-90% of 60%, or roughly 40-55% net efficiency. Add in some more (smaller) transmission losses, or any losses due to energy storage (optional, but highly recommended for renewable) and it doesn’t seem so wildly different anymore

    2 votes
  4. Comment on Weekly coronavirus-related chat, questions, and minor updates - week of January 10 in ~health.coronavirus

    arghdos
    Link Parent
    For sure -- it may be a drop in an already overflowing bucket. It's a terrible situation: "Not having enough staff available to keep a hospital open" is clearly awful. But also, good lord,...

    For sure -- it may be a drop in an already overflowing bucket.

    It's a terrible situation: "Not having enough staff available to keep a hospital open" is clearly awful. But also, good lord, healthcare workers have been having to deal with so much already, can you imagine having to go back to work with the possibility of infecting others, developing symptoms later, not resting while having a serious illness, etc.

    I can't imagine a world where this helps burn-out... :/
    We don't even pay lip-service to "supporting our first-responder heros" anymore... it's really laid bare how much the system is taking advantage of them

    4 votes
  5. Comment on Weekly coronavirus-related chat, questions, and minor updates - week of January 10 in ~health.coronavirus

    arghdos
    Link Parent
    Ah yes, I’m sure sending positive asymptomatic healthcare workers back to work won’t contribute to the staff shortage. What a farce

    Ah yes, I’m sure sending positive asymptomatic healthcare workers back to work won’t contribute to the staff shortage.

    What a farce

    4 votes
  6. Comment on How do I calculate my family's "average family location"? in ~talk

  7. Comment on How do I calculate my family's "average family location"? in ~talk

    arghdos
    Link Parent
    Ahhh, yeah good point. Santa's family visiting the Antarctic would be quite fun :)

    Ahhh, yeah good point. Santa's family visiting the Antarctic would be quite fun :)

    1 vote
  8. Comment on How do I calculate my family's "average family location"? in ~talk

    arghdos
    Link Parent
    The average position in the surface-constrained case where you have two members on opposite sides of the globe would have two solutions: both the points equidistant between them. The answer would...

    The average position in the surface-constrained case where you have two members on opposite sides of the globe would have two solutions: both the points equidistant between them.

    The answer would be arbitrary, depending on the coordinate system you choose.

    But, given OPs problem statement, it’s probably not relevant

    1 vote
  9. Comment on How do I calculate my family's "average family location"? in ~talk

    arghdos
    (edited )
    Link Parent
    Ahhh yeah, you’re right, i forgot that lat/lon aren’t real coordinate systems and would screw with the calculation at the date lines or the poles. It’s probably a safe assumption the OP wouldn’t...

    Ahhh yeah, you’re right, i forgot that lat/lon aren’t real coordinate systems and would screw with the calculation at the date lines or the poles. It’s probably a safe assumption the OP wouldn’t hit this as they stated they’re all on the same continent.

    Rather than converting to Cartesian, wouldn’t it be easier to convert to spherical coordinates and arbitrary map longitude to 0-360 and latitude to 0-180? You just choose a solution and roll with it, way less trig :p

    1 vote
  10. Comment on How do I calculate my family's "average family location"? in ~talk

    arghdos
    (edited )
    Link Parent
    Heh. Well this may or may not help, but an attempted ELI5: Imagine you draw a line on an 2D axis: https://i.stack.imgur.com/kCW16.png Then you decide you want to know the area enclosed by the...

    Heh. Well this may or may not help, but an attempted ELI5:

    Imagine you draw a line on an 2D axis:

    https://i.stack.imgur.com/kCW16.png

    Then you decide you want to know the area enclosed by the shape of the line to horizontal axis:

    https://en.m.wikipedia.org/wiki/File:Integral_example.svg

    Then, if you divide that by the length of the curve on the horizontal axis, you calculate the height of a rectangle with the same area:

    https://www.mathopenref.com/calcaveval.html

    Which is the average value of the height of the line!

    This is applies in multiple dimensions and to find the average in time!

    4 votes
  11. Comment on How do I calculate my family's "average family location"? in ~talk

    arghdos
    (edited )
    Link
    If you have access to time series location data you should be able to calculate the average location via scipy’s integrator functions (e.g., the (un?)fortunately named cumtrapz). From calc, the...

    If you have access to time series location data you should be able to calculate the average location via scipy’s integrator functions (e.g., the (un?)fortunately named cumtrapz).

    From calc, the average is simply the integral of the position divided by the time window: newest time stamp in the week minus the oldest time stamp. Use the same time units in as in the integral for this.

    For your purposes, I’d suggest just calculating the average latitude and longitude of each person separately and then compute a the plain old average over all family members.

    There’s probably a service out there to translate that into a nearest town or something, but I’m less sure there

    HTH

    7 votes
  12. Comment on What do you think about this potential alternative to Odesli/Song.link? in ~music

    arghdos
    Link Parent
    Heh, href is sufficiently nerdy :)

    Heh, href is sufficiently nerdy :)

    1 vote
  13. Comment on Gaming on Linux - LTT Daily Driver Challenge Finale in ~games

  14. Comment on Linux in a Pixel Shader - A RISC-V Emulator for VRChat in ~comp

    arghdos
    Link Parent
    Made me wonder what happens in some of my Kokkos programs where every memory access is an inlined function, I suppose really I should check the size of the kernel and see if it fits in the...

    Made me wonder what happens in some of my Kokkos programs where every memory access is an inlined function, I suppose really I should check the size of the kernel and see if it fits in the instruction cache :)

    2 votes
  15. Comment on Linux in a Pixel Shader - A RISC-V Emulator for VRChat in ~comp

    arghdos
    Link
    Implementing this all in HLSL is stupendously amazing (given the basic language features it lacks like function pointers and array indexing). I wonder what it would look like in CUDA where you can...

    Implementing this all in HLSL is stupendously amazing (given the basic language features it lacks like function pointers and array indexing). I wonder what it would look like in CUDA where you can at least do almost all of basic C.

    2 votes
  16. Comment on What games have you been playing, and what's your opinion on them? in ~games

    arghdos
    Link
    Psychonauts 2 Started playing the new psychonauts early in December. It’s honestly not a fantastic platformer: the controls are gluey, it’s really easy to over or undershoot landings, even for...

    Psychonauts 2

    Started playing the new psychonauts early in December. It’s honestly not a fantastic platformer: the controls are gluey, it’s really easy to over or undershoot landings, even for rails and trapeze that the developers clearly designed to land you on the right spot. But, looking back, platforming wasn’t the strength of the original either.

    The level design is original, the humor and writing are spot on, and the new powers are fun to play with.

    Overall it’s been enjoyable

    5 votes
  17. Comment on Tildes Game Giveaway Thread: Holiday 2021 in ~games

    arghdos
    Link Parent
    I would love to give reventure a shot!

    I would love to give reventure a shot!

    1 vote
  18. Comment on Foreboding discovery of a main character’s past - in-depth book discussion and recommendations request in ~books

    arghdos
    Link
    If you haven’t read it, I’d suggest Gene Wolfe’s Book of the New Sun. It’s not quite discovery of a character’s past but I think it ticks most of the boxes here.

    If you haven’t read it, I’d suggest Gene Wolfe’s Book of the New Sun. It’s not quite discovery of a character’s past but I think it ticks most of the boxes here.

    2 votes
  19. Comment on What will prevent this site from becoming Reddit 2.0? in ~tildes

    arghdos
    (edited )
    Link Parent
    I agree with this. I think it’s largely Tildes lack of scale that saves it at the moment. And, while, as you note, there are design decisions to avoid rapid growth (e.g., non-profit status, no VC...

    I agree with this. I think it’s largely Tildes lack of scale that saves it at the moment. And, while, as you note, there are design decisions to avoid rapid growth (e.g., non-profit status, no VC money, etc.), and ideas on how to try to actually improve the user experience at scale (via the proposed trust system), relatively little of it is in place now.

    That is, in the highly unlikely event that Reddit went full Digg v4 tomorrow, and Tildes ballooned in size as a result, I don't think we could prevent it from being just another Reddit.

    I don’t blame anyone for this mind you, as effective moderation and community building at scale is essentially a grand challenge problem, or if you believe Masnik, impossible.

    2 votes
  20. Comment on What were the best games you played this year? in ~games

    arghdos
    Link Parent
    I’d give it a shot sometime after the holidays if you need an extra!

    I’d give it a shot sometime after the holidays if you need an extra!

    1 vote