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Comment: Re:But what IS the point they're making? (Score 1) 334

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?

Comment: Re: Nevada is the only candidate (Score 1) 172

by mirix (#47505525) Attached to: California In the Running For Tesla Gigafactory

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.

Comment: Re: Nevada is the only candidate (Score 1) 172

by mirix (#47505461) Attached to: California In the Running For Tesla Gigafactory

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..?

+ - What Did US Spy Satellites See in Ukraine?->

Submitted by Anonymous Coward
An anonymous reader writes "The dog-not-barking question on the catastrophe over Ukraine is: what did the U.S. surveillance satellite imagery show? It’s hard to believe that – with the attention that U.S. intelligence has concentrated on eastern Ukraine for the past half year that the alleged trucking of several large Buk anti-aircraft missile systems from Russia to Ukraine and then back to Russia didn’t show up somewhere.

Yes, there are limitations to what U.S. spy satellites can see. But the Buk missiles are about 16 feet long and they are usually mounted on trucks or tanks. Malaysia Airlines Flight 17 also went down during the afternoon, not at night, meaning the missile battery was not concealed by darkness.

So why hasn’t this question of U.S. spy-in-the-sky photos – and what they reveal – been pressed by the major U.S. news media? How can the Washington Post run front-page stories, such as the one on Sunday with the definitive title “U.S. official: Russia gave systems,” without demanding from these U.S. officials details about what the U.S. satellite images disclose?"

Link to Original Source

+ - Russia shows proof of warplanes In MH17 vicinity,demands answers from US/Kiev->

Submitted by Anonymous Coward
An anonymous reader writes "Ukraine hasn’t said how it immediately knew rebels downed Malaysian plane, notes the Russian Foreign Ministry, as it unveils 10 awkward questions for Ukraine (and perhaps the US 'snap judgment') to answer about the MH17 disaster. However, what is perhaps more concerning for the hordes of finger-pointers is that:
[1] Russia has images of Ukraine deploying BUK rockets in east
[2] Ukraine moved BUK near rebels in Donetsk on July 17th
[3] Russia detected Ukrainian fighter jet pick up speed toward MH17

Aside from the fake YouTube clips, these would deal another unpleasant blow to US foreign policy."

Link to Original Source

+ - Members of previously uncontacted tribe infected with flu->

Submitted by sciencehabit
sciencehabit (1205606) writes "Brazil’s Indian affairs department has announced an event that many anthropologists and medical researchers had feared. In the remote Brazilian state of Acre, members of a long-isolated Amazon tribe have contracted influenza after making voluntary contact with the outside world a few weeks ago. Some researchers now fear that the contacted individuals will spread the potentially fatal virus to other nonimmunized members of their tribe."
Link to Original Source

+ - Linux based OS for Smart Router and Smart Home Appliances->

Submitted by Taco Cowboy
Taco Cowboy (5327) writes "A maker of wifi router from China, HiWiFi, has opened up its Smart-Router OS, HiWiFi-OS, based on Linux, to developers and makers of smart devices, including routers, home appliances and other devices that fall into the internet of things category, to enable the developers and maker to build applications for the platform and adopting a WiFi solution for the smart devices which might resulted in a further evolution of a new internet of things ecology

The operating system supports routers using MediaTek-based chips"

Link to Original Source

Comment: Re:On his Birthday, even... (Score 0) 78

by mirix (#47428841) Attached to: The Oatmeal Convinces Elon Musk To Donate $1 Million To Tesla Museum

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.

Wasn't there something about a PASCAL programmer knowing the value of everything and the Wirth of nothing?