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Comments

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Earth In the Midst of Sixth Mass Extinction: the 'Anthropocene Defaunation'

mirix Re:But what IS the point they're making? (312 comments)

But when concrete sets, it does so via reabsorbing the CO2, right? So it should be a net neutral (minus CO2 from the fuel to cook the limestone in the first place).

CaCO3 + heat -> CaO + CO2 (in air)

Add water, get Ca(OH)2, which reacts with CO2 from air to set... back as CaCO3 and water..

Or did I miss something?

3 days ago
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Western US States Using Up Ground Water At an Alarming Rate

mirix Re:And what's even funnier (369 comments)

Oh no! Kids in Seattle must not have rotten teeth. The horror!

4 days ago
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California In the Running For Tesla Gigafactory

mirix Re: Nevada is the only candidate (172 comments)

I guess the compound mustn't be 1:1 Ni:Co as written, as some site shows Co and Li being 10% of mass, and Ni 50%, for reasons I don't entirely understand.

In that case Ni is by far the biggest cost, and Cobalt is still a bigger share of the cost than lithium.

It must actually be a mixture of LiNiAlO2 and LiCoAlO2 or something like this? my distant highschool chemistry is failing me.

about a week ago
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California In the Running For Tesla Gigafactory

mirix Re: Nevada is the only candidate (172 comments)

There is zero nickle in a Li-ion cell. Nickel, on the other hand exists in some variants.

Anyway, it looks like the model S uses lithium nickel cobalt aluminium oxide "NCA" LiNiCoAlO2. Aluminium is almost free. lithium compounds are cheap (looks like 5-7k per ton, depending on grade or compound) in comparison to the other metals. Nickel is 18k a ton, and cobalt double that yet.

Both nickel and cobalt weigh around 60g per mole, with lithium a tenth of that, so they also need roughly ten times the mass of nickel and cobalt per mole of LiNiCoAlO2. I guess the lithium is sold as LiOH, which is only roughly a quarter lithium by mass. So to make 1 ton of lithium worth of the compound, you'd need:

4 tons LiOH - $24k
10 tons Ni $180k
10 tons Co $360k
4t aluminium $8k

so the lithium seems to be pretty inconsequential to the overall cost. Mind you those are just metal prices, which I guess is technical grade. If the batteries require better refined metal it probably costs more yet. Then you need graphite for the anode, steel? case, and whatever else bits.

So it looks like the GP is right (barring forgetting cobalt), unless i'm missing something with the chemistry..?

about a week ago
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California In the Running For Tesla Gigafactory

mirix Re:Texas? (172 comments)

5th highest rate of poverty in the country. I guess even being poor is bigger in Texas.

Sure, it's fine if you're a developer in Austin. But a lot of texas is... texas.

about a week ago
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ChickTech Brings Hundreds of Young Women To Open Source

mirix Re:Kuhscheisse. (158 comments)

Russians have the innate ability to code.

about two weeks ago
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The First Person Ever To Die In a Tesla Is a Guy Who Stole One

mirix Re:Hi speed chase, hum? (443 comments)

So would anyone that had just been wronged by a criminal. That's why we have a judge and jury give out punishments, and not the victim or vigilantes.

about two weeks ago
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The Oatmeal Convinces Elon Musk To Donate $1 Million To Tesla Museum

mirix Re:Speaking of Tesla (78 comments)

I see your 100 billion and raise you 500 000 000 000

one new (1994) dinar was equal to 10^27 old (socialist yugoslavia) dinar, four years later. I guess a country disintegrating war and embargo will do that.

about three weeks ago
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The Oatmeal Convinces Elon Musk To Donate $1 Million To Tesla Museum

mirix Re:On his Birthday, even... (78 comments)

Why can't someone borderline insane be for the sterilization of the insane? Keep in mind that he had no partner or children, by choice... or barring that, that it's pretty common for people with an odd outlook to think of themselves as normal or proper.

Parts of Canada kept sterilizing mental deficients through the 70's, he would have been proud.

about three weeks ago
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Unintended Consequences For Traffic Safety Feature

mirix Re:sound and sides (579 comments)

in much of central europe and the balkans, red lights turn amber before they turn green. (or red -> red & amber -> green). Not sure if further east does this too.

Like they want people drag race, I guess. I don't think they really have problems though...

about a month ago
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Unintended Consequences For Traffic Safety Feature

mirix Re:Not for deaf/hard of hearing... (579 comments)

Piezos have a very narrow resonant frequency, so if you try to make a broadband white noise it's very inefficient (and I presume would mostly still be audible only at the resonant frequency).

Cheaper than speakers and easy to drive, so... like everything else I guess... 'good enough'.

FWIW the walk lights here are mostly high pitch, but more than a few feet away I only hear a sort of metronome clicking, as the high part gets lost in traffic. So they must have some low component as well. (or i'm half deaf up high, maybe...)

about a month ago
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Philips Ethernet-Powered Lighting Transmits Data To Mobile Devices Via Light

mirix Re:Resistance losses (104 comments)

PoE, the standards complying versions at least, 802.3af (IIRC), do run at 48V. As it is about the highest you can go with shit insulation and not be required to meet real safety standards, while at the same time battling I2R losses with get brutal on long runs with low voltages.

I agree though, unless a room only has one 20W lamp, CAT5 isn't the way to be powering it...

If we want to save copper, we should do what we do now. Wire houses with 220V, and switch down at the load.

about a month ago
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Russia Moves From Summer Time To Standard Time

mirix Re:Saskatchewan (158 comments)

But we are also permanently on DST, as it's more like 11 when the clock reads noon.

No way you slice it, days are too short in winter, too long in the summer. shifting one way or the other makes no difference. In winter it's dark when you get up and dark when you go home.

about a month ago
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Ask Slashdot: Correlation Between Text Editor and Programming Language?

mirix Re: Emacs, vi, IDE (359 comments)

I like Geany quite a lot, I use it on windows and linux.

It has plugins like notepad++; whether there are as many available I'm not sure.

about a month ago
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Germany Scores First: Ends Verizon Contract Over NSA Concerns

mirix Re:Are you getting it yet? (206 comments)

"tabulating machines". they did very simple computations. punched card based.

about a month ago
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Opera Releases a New Version For Linux

mirix Re:Awesome! (99 comments)

Have you even seen the last few releases?! I've used firefox since the beginning, and the last while has been a steady decline into a chrome clone.

I'd change browsers if there was something to change to... Everyone seems to want UX designer wetdream minimalism, fuck functionality.

about a month ago
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Opera Releases a New Version For Linux

mirix Awesome! (99 comments)

Instead of having firefox which wants to be chrome, or running chrome directly... I can now run a wrapper around chrome!

about a month ago
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World's First Large-Scale Waste-to-Biofuels Facility Opens In Canada

mirix Re:Jerk off material for the Greenies (96 comments)

Liberal by Alberta standards, I guess. You guys even have one MP that isn't a conservative!

about a month ago

Submissions

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Upcoming wikileaks release to stress american ties

mirix mirix writes  |  more than 3 years ago

mirix (1649853) writes "CBC reports that the US has told Canada that an impending wikileaks release may cause a negative impact on US ties with foreign nations.
Apparently the US is also informing other nations of the release — It could be pretty damning if they are bothering to notify foreign ministers beforehand."

Link to Original Source

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