@dan613@ottawa.place
@dan613@ottawa.place avatar

dan613

@dan613@ottawa.place

🇨🇦Recovering engineer, ex-military (#RMC), ex-Jazz musician, triggered by injustice. Born 318.5 ppm CO₂. Raised in BC, but in Ottawa since 1990. Generation Jones, but never conservative. Joined Mastodon in April 2022.

Profile pic: myself against Canada's warming stripes
Banner: Cityscape of Cyberpunk 2077's Night City at twilight

This profile is from a federated server and may be incomplete. Browse more on the original instance.

noneuclideandreamer, to random
@noneuclideandreamer@mathstodon.xyz avatar

The Hyperbolic Square Tiling Honeycomb.

A bug kills it if I try to go deeper than this... 🤔

#codeart #mathart #hyperbolic

Squares meeting in hexahedral vertex figure.

dan613,
@dan613@ottawa.place avatar

@noneuclideandreamer @xerophile Stack overflow!

Dianora, to Ottawa
@Dianora@ottawa.place avatar

Anyone else remember when we could skate from downtown to Carleton U on the canal?

#Ottawa

dan613,
@dan613@ottawa.place avatar

@Dianora Possibly next year, Ottawa budget willing. But I fear that soon even a colder than average year will still be too warm. Part of the problem is that we have almost always gotten warm periods for one of the two weeks of Winterlude.

ottaross, (edited ) to cooking
@ottaross@mastodon.social avatar

You're cooking a thing, you will typically…

dan613,
@dan613@ottawa.place avatar

@ottaross Excuse me, they are called "science experiments".

grivettcarnac, to Ottawa
@grivettcarnac@mstdn.social avatar

deleted_by_author

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    dan613,
    @dan613@ottawa.place avatar

    @grivettcarnac It's been 20 years since I've made that trip (RIP, Nortel) but isn't there a really narrow train underpass on the West end of Carling? I suppose that could be reworked somehow.

    foolishowl, to random
    @foolishowl@social.coop avatar

    Years ago, I read a history of the computer industry in a Marxist journal; among other things, it argued that there was an expectation cultivated that widespread computerization would mean dramatic increases in productivity. But it didn't. Productivity increased, but at about the same gradually slowing rate as it had been.

    I suspect the AI hype is partly about worries about declining rates of increasing productivity.

    dan613,
    @dan613@ottawa.place avatar

    @CedarTea @foolishowl That's because the research is grossly underfunded. It was 20 years away with full funding.

    ottaross, (edited ) to tea
    @ottaross@mastodon.social avatar

    This is prob mostly for tea drinkers, but curious about general habits. How often do you typically boil your kettle in a day?

    dan613,
    @dan613@ottawa.place avatar

    @ottaross I'm now wondering if I should get one of those countertop insulated hot water dispensers. I'd need a few litres at least. We tend to boil more than we need each time, which wastes energy.

    dan613,
    @dan613@ottawa.place avatar

    @ottaross @skatem While a microwave doesn't have to heat a container as well as the water, it does lose energy in converting electricity to microwave. And the container has to heat up anyway for the water to boil, so I think it's a wash. Another con is knowing exactly when to stop, whereas a kettle nor dispenser have this problem. An electric kettle has a thin bottom above the heating element, and so has less material to heat up. I'm thinking that is probably the way to go if you put in the exact amount of water needed.

    dan613,
    @dan613@ottawa.place avatar

    @ottaross @skatem I have my eye on this one, now: https://www.canadiantire.ca/en/pdp/zojirushi-electric-hot-water-boiler-warmer-dispenser-black-stainless-steel-4-l-0430307p.html

    It's more expensive than the other model CT sells, but it has a feature to warm only to the desired temperature instead of boiling and cooling, and it has a delay start so we can fill it at night and it'll be ready just as we wake up. If the surface is warm, I might add some additional insulation, like craft foam.

    dan613,
    @dan613@ottawa.place avatar

    @ottaross @skatem Yes, for radiant heat loss it is the 4th power. But for convection heat loss it is linear. But every bit helps over the long run.

    dan613,
    @dan613@ottawa.place avatar

    @ottaross @skatem I have a watt meter, so I'll check it out.

    dan613,
    @dan613@ottawa.place avatar

    @ottaross @skatem My kettle takes 0.1 kWh to bring 1 L (1 kg) of 20℃ water to 100℃
    0.1 kWh is 360 kJ
    Specific heat of water is 4.2 kJ/kg-K
    Therefore it takes 4.2 * 80K * 1 kg = 336 kJ to bring water to a boil
    Therefore my kettle is 93% efficient.

    I'd probably be a bit more efficient if I turned it off myself a bit sooner (I waited for the automatic shutoff). In any case, I spend about $35/year to boil water.

    stephanie, to random
    @stephanie@ottawa.place avatar

    Weekend plans (after Costco): finish painting the media room! Kyle really wanted a fun geometrical wall behind the TV, so hopefully we can do it! (White, pale blue, dark blue and black).

    We have baseboards and a ceiling without holes, so that's a good start!

    White wall with some geometric shapes made with green painting tape

    dan613,
    @dan613@ottawa.place avatar

    @stephanie Do you have plans for the electric heat at some point?

    dan613,
    @dan613@ottawa.place avatar

    @stephanie @Foodiekenobi Mirrors. It'll practically disappear! <BONK!>

    dan613,
    @dan613@ottawa.place avatar

    @stephanie @Foodiekenobi Oh, well 5 inches of foam, then. Can't have you unable to post because of a post.

    dan613, to random
    @dan613@ottawa.place avatar

    One afternoon when I was a young lad in Prince George, our neighbour’s house caught fire. Dad said the neighbour’s son was home alone, and he saw him bring buckets of water from outside into the basement.

    Dad called the fire department when he saw the smoke, and rushed us across the street, where we waited anxiously for signs the fire might spread to our house. Fortunately it was put out in time.

    Anyway, if you wonder why I frequently boost US political news…

    #CanPoli #CdnPoli

    CdnCurmudgeon, to random
    @CdnCurmudgeon@mastodon.social avatar

    Cartoon from Xitter today. PoiLievre as Putin's puppet. Spot on. The CONservative Party has gone full fascist these days.

    dan613,
    @dan613@ottawa.place avatar

    @CdnCurmudgeon Wait, he wouldn't say what his reasons were?

    dan613,
    @dan613@ottawa.place avatar

    @CdnCurmudgeon Ah, because it has the words "carbon tax" in it, despite Ukraine already having a carbon tax and needing one to join the EU.

    And because they want Tucker Carlson to continue recruiting for them.

    https://apple.news/ADDT2K3ksS0yOwDKTQtvwPQ

    #CanPoli #cdnpoli

    dan613, to climate
    @dan613@ottawa.place avatar

    In the same vein as my last post, I've calculated the global temperature trend using annual temperatures. Here much of the monthly variability disappears, and the correlation to El Niño becomes much more obvious. Removing the natural influences (including solar and volcanic) shows the annual temperature progressing very steadily.

    Should we use the annual temperature instead of monthly? The problem with annual is that shorter events such as volcanic and El Niño could get spread out over multiple years, making them seem less important than they are. A monthly trend doesn't have this problem. So I'll stick to monthly projections, even though there is more variation.

    I discuss this in more detail on my blog: https://dmn613.wordpress.com/2024/02/16/2023-temperature/

    #ClimateChange

    dan613, to random
    @dan613@ottawa.place avatar

    It'll take a few days for my mastodon instance move finishes. I may have to manually refollow some of you.

    plantarum, to Ottawa
    @plantarum@ottawa.place avatar

    Is #Ottawa (the City) Quietly Quitting Its #Climate Promises?

    https://the613.substack.com/p/is-ottawa-abandoning-its-climate

    dan613,
    @dan613@ottawa.place avatar

    @plantarum What a great mayor the suburbs elected, eh? Ugh.

    dan613, to mastodon
    @dan613@ottawa.place avatar

    It's super annoying that I can export lists but I can't import them. I had several from my last instance, and will have to recreate them manually. #Mastodon

    dan613, to random
    @dan613@ottawa.place avatar

    How do N95 masks catch particles that are smaller than the holes?

    1. Particles are sticky because of static forces
    2. Large particle go straight until they hit a mask layer
      Tiny particles get knocked around by molecules until they hit a fibre
    3. Fibres are given an electric charge so that they attract all particles

    http://‪youtu.be/eAdanPfQdCA‬

    dan613, to climate
    @dan613@ottawa.place avatar

    We have all the tools needed to avoid the coming . Don't let anyone tell you we can't or we shouldn't.

    leigh, to random
    @leigh@ottawa.place avatar

    My extremely badass friend and @tallpoppy advisor @satnam has an important new research report out on "pig butchering" scams. If you've ever wondered what those weird wrong-number texts are about, this is the answer, and it's super dark.
    Read it, and tell the less-online folks in your life about it. You could save someone you care about from life-altering victimisation.

    https://www.tenable.com/blog/pig-butchering-scam-tinder-tiktok-whatsapp-telegram-scammers-steal-millions

    dan613,
    @dan613@ottawa.place avatar

    @leigh @tallpoppy @satnam The biggest giveaway is when they want to move you onto a messaging app. As the article points out, you are less likely to report them for scamming that way.

    Interesting that they can work around Tinder's verification system.

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