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Economics
  • You only need a graphing calculator because you're not allowed to use wolfram alpha, desmos, or Matlab. Since you're mandated to use graphing calculators, (sometimes even specific models) there's no incentive to make them cheaper or better since you need to buy them anyway.

  • Locked
    Please Do Not Let Elon Musk Destroy the Ozone Layer
  • SpaceX has been receptive to design changes to starlink in the past to minimize impact, like decreasing reflectivity and reflection angles for astronomers. They might be receptive to moving to different alloy for the body construction.

    Magnesium comes to mind that would be light but expensive. Steel alloys might be cheap and heavy options for later when starship is operational. Would those have similar effects on ozone, or is it only the aluminum oxides? Carbon fiber also looks promising. It could be pretty cheap and light if you can keep it planar rather than custom formed. Someone had mentioned wood in a different thread, but I'm uncertain if that'd work because of off gassing.

  • Algae offer real potential as a renewable electricity source, new Concordia research shows - Concordia University
  • Interesting, I thought this would be about using algae for kerosene synthesis, but it looks like they're getting electricity from it like a solar panel. I wonder what the area efficiency is vs a solar panel, and if it might have advantages in cost or longevity.

    The actual paper link https://www.mdpi.com/1996-1073/17/7/1749#

  • Music Production @lemmy.studio JohnDClay @sh.itjust.works
    [Question] Digital additive sine wave synthesis from equations

    Anyone have tips on digital additive synthesis? I'm looking to define a curve for the overtone series to follow and generate and combine sign waves from that. Looks like there is a way in Python?

    https://medium.com/@noahhradek/sound-synthesis-in-python-4e60614010da

    Anyone have thoughts or experience with generating sounds in Python? Are there any artifacts I should watch out for? Is there an easier way to generate tones from equations for their overtone series? Thanks!

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    We are still flying half a ship!

    Another happy landing. I can't believe starship managed to land gently after burning half the flap off!

    https://youtu.be/rXRVtt8M9oY

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    Walking stick for your hike!

    Just make sure to return them when you're done! Maybe even add a new one if you find one.

    The one I used was very nice. Has a nice heft all the way down, and was very straight.

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    this intricate pattern on a stick found while hiking in sedona, az

    cross-posted from: https://lemm.ee/post/29486021

    > cross-posted from: https://lemmit.online/post/2665486 > > > this intricate pattern on a stick found while hiking in sedona, az > > > > ##### This is an automated archive made by the Lemmit Bot. > > The original was posted on /r/mildlyinteresting by /u/delayed_milk on 2024-04-15 04:56:39. > >

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    interestingasfuck @lemmy.world JohnDClay @sh.itjust.works
    Drone footage of Sinuiju City North Korea

    XiaoHao2 took these pics and videos from across the China boarder with a dgi drone in 2020. They uploaded just recently. Here's some more pics

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    Disable tracking on Chevy Bolt 2019

    OnStar reports location and speed data to the car manufacturer. Sometimes they will sell this data to insurance companies to raise your premium, as several news stores pointed out a few weeks ago. I couldn't really find an advantage to OnStar, (I have my phone to call emergency services) so I disabled it by pulling it's fuse.

    For my 2019 bolt, it's f31 in the instrument panel fuse box, just down and to the left of the steering wheel. The fuse box cover comes off when you pull it hard from the bottom.

    I was able to find which fuse went to OnStar in the owners manual and labeled on the inside of the fuse box cover. You should be able to find it for your model car there too if it uses OnStar.

    I did have the casualty of my speaker for calls and texts. I'm not able to use it right now. I'll see if I can dig in and reconnect it somehow, but we'll see.

    Who knows that other into they're snitching back to GM, or what they could do in the future, so I recommend disconnecting it. Good luck!

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    Reentry looked so cool!

    Amazing views, especially for live! I don't think we've ever seen reentry plasma on a live stream before.

    PS, does anyone know how to get a direct link to a twitter video? I used to be able to through nitter, but that shut down. I can't figure out how to get twitter videos on lemmy directly now.

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    POSITRON JourneyMaker, upside Down Portable 3D Printer

    Folds down to fit inside a 1kg filament box. Upsidedown let's the complicated moving bits be in the base where there's less vibration. Krylan3D originally designed this to easily take in a backpack back and forth from college, but is now hired and working on designing other 3d printers. So the community has made improvements and made it easier to make yourself. Parts cost about $550.

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    How much it costs to cut 1 metric ton of carbon emission with various methods for different global carbon emission levels

    As you reduce the amount of carbon emissions (the y axis) the methods to keep reducing carbon cost more (the x axis.)

    This great graph came to my attention from this video from vlogbrothers. It also has some good explanations of what it means.

    Note that carbon capture doesn't really make sense till you've exhausted all the other emission minimizing methods.

    Source: https://www.edf.org/revamped-cost-curve-reaching-net-zero-emissions

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    Ancalagon the Black, by Ruben de Vela, 2010

    Ancalagon the Black, the absolutely gargantuan dragon from the first age of middle earth!

    This fantastic artwork is by Ruben de Vela. I think the sense of scale and immense power are remarkable.

    >But Earendil came, shining with white flame, and about Vingilot were gathered all the great birds of heaven and Thorondor was their captain, and there was battle in the air all the day and through a dark night of doubt. Before the rising of the sun Earendil slew Ancalagon the Black, the mightiest of the dragon-host, and cast him from the sky; and he fell upon the towers of Thangorodrim, and they were broken in his ruin. The Simarilian chapter 24

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    Exam questions be like
    i.imgur.com Imgur

    Discover the magic of the internet at Imgur, a community powered entertainment destination. Lift your spirits with funny jokes, trending memes, entertaining gifs, inspiring stories, viral videos, and so much more from users.

    Imgur

    It can't be that hard, it's only two questions!

    Credit to the original video (as far as I know) https://www.youtube.com/watch?v=OgGAmZ1r7Yg

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    Repair mode for Pixel Privacy
    blog.google More ways to repair your Pixel phones

    We’re improving the repair process with more ways to protect your privacy, easy-to-use manuals and easier to find parts and repairs.

    More ways to repair your Pixel phones

    Hopefully this will help lower objections to getting devices repaired

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    TIL Bologna in Italy had dozens of towers built in the middle ages

    These mini castles were built all over the city.

    >The reasons for the construction of so many towers are not clear. One hypothesis is that the richest families used them for offensive/defensive purposes during the period of the Investiture Controversy.

    Only a few survive to the current day.

    !current day pic

    https://en.m.wikipedia.org/wiki/Towers_of_Bologna https://www.sciencedirect.com/science/article/pii/S1296207418306952

    19
    With US nuclear modernization, we all know what design they should go with

    Here's some helpful schematics for a thermometer gnome.

    !thermonuclear gnome

    !Video

    https://youtu.be/YPW_HeOHA1E

    18
    But my lord there IS no such force
    i.imgur.com Imgur

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    Imgur
    3
    Guide to a good stick

    Sticks come in many shapes and sizes, but this is guide to a good vanilla one.

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    Such a great sword stick!

    I'd love a stick like this, so much fun waving it around.

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    Starship Takes Flight!

    Starship, largest rocket ever built, just launched! Look at those shock waves!

    Video from SpaceX twitter. https://nitter.net/SpaceX/status/1725879726479450297#m

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    InitialsDiceBearhttps://github.com/dicebear/dicebearhttps://creativecommons.org/publicdomain/zero/1.0/„Initials” (https://github.com/dicebear/dicebear) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)JO
    JohnDClay @sh.itjust.works
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