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Comments

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Is the Tesla Model 3 Actually Going To Cost $50,000?

WalksOnDirt Re:Maybe 40k (389 comments)

In their conference call Tesla stated their intention was to continue using cylindrical cells, but that the size would be increased by about 30%. Sorry, I didn't save the link.

3 days ago
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Wave Power Fails To Live Up To Promise

WalksOnDirt Re:Golden opportunity missed... (195 comments)

The problem with wave farms is that they harness the gravitational power between Earth and the Moon.

No, that would be tidal power. The wave energy comes mostly from the wind. The main side effect that occurs to me would be less coastal erosion.

3 days ago
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Is the Tesla Model 3 Actually Going To Cost $50,000?

WalksOnDirt Re:Maybe 40k (389 comments)

Nobody is using the size of cells that Tesla claims to be interested in producing. If they get cheap enough companies might design some products around them, but, for example, they will be too fat for a cell phone.

Of course Tesla might make other sizes, but I doubt they will be in any hurry to do that.

4 days ago
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To Really Cut Emissions, We Need Electric Buses, Not Just Electric Cars

WalksOnDirt Re:Container ships (486 comments)

Listing two obvious fallacies doesn't prove the initial statement is one, although at best it could only be true of sulfur based pollution. Of course, sulfur dioxide helps keep the planet cool anyhow, so maybe we shouldn't count it if it is released in the open ocean.

about two weeks ago
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To Really Cut Emissions, We Need Electric Buses, Not Just Electric Cars

WalksOnDirt Buy a better bus! (486 comments)

A 30 mile range? What kind junk are the buying?

A BYD electric bus has a nominal range of 155 miles. It sounds much more reasonable to me.

about two weeks ago
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L.A. Times National Security Reporter Cleared Stories With CIA Before Publishing

WalksOnDirt Re:No suprise (188 comments)

This is the New York Times.

No, it is the Los Angeles Times. There are many Times in the world, the summary should reflect that.

about two weeks ago
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Reno Selected For Tesla Motors Battery Factory

WalksOnDirt Re:Don't they use a lot of water (157 comments)

They need Electrolytes...

The electrolytes used in lithium ion batteries don't use water. Water is unstable at those voltages.

Of course, the factory must use some water, if only for the employees drinking. I don't know how much, though. Perhaps it is worth mentioning that there appears to be a small river near the site.

about two weeks ago
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Climate Scientist Pioneer Talks About the Furture of Geoengineering

WalksOnDirt CDR yes, SRM no (140 comments)

I don't see any problems with carbon dioxide removal, aside from potential local environmental problems. The methods include reforestation, adding iron to the ocean and grinding up serpentine.

Solar radiation management, like adding sulfates to the air, has lots of global environmental effects, and it doesn't do anything about acidification of the oceans.

It's best to consider these separately.

about three weeks ago
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Seagate Ships First 8 Terabyte Hard Drive

WalksOnDirt Re:Can we get a tape drive to back this up? (316 comments)

Tapes has a crapload of drawbacks, write speed, read speed, the fact it's sequential (random access is painful) but it remains popular because you can drop it, smash it, submerge and then freeze it and all you have to do is roll the tape into a new case.

Maybe they have fixed it, but I heard some old stories about dropping tapes corrupting them.

about three weeks ago
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How Argonne National Lab Will Make Electric Cars Cheaper

WalksOnDirt Re:Economic risk (143 comments)

The lithium in a modern battery is not aqueous, which is the default in your table. What the result would be in a modern electrolyte, I don't know.

about 1 month ago
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How Argonne National Lab Will Make Electric Cars Cheaper

WalksOnDirt Re:Economic risk (143 comments)

Nicely written post, but you don't know what you're talking about.

Hydrogen is not the strongest reducing agent amount the stable elements. If you go by electronegativity it is cesium. Cesium is rather heavy, though.

Lithium would make a very good cathode (if we could just control the dendrites), but it's not what lithium-ion batteries use. Transition metal compounds are far from ideal for cathodes, but they have the advantage that we can make them work pretty well.

Lithium-sulfur is potentially the next battery after lithium-ion, if only we can make them last long enough.

about 1 month ago
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No, a Huge Asteroid Is Not "Set To Wipe Out Life On Earth In 2880"

WalksOnDirt Re:Asteroids are a threat - let's deal with them (123 comments)

This asteroid is only around 1 km in diameter. An impact would be distinctly annoying, but civilization, and most people, should survive.

about a month ago
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Stanford Team Creates Stable Lithium Anode Using Honeycomb Film

WalksOnDirt Re:Stable? (119 comments)

At one cycle a day that will take awhile.

Cui has previously touted results of a different battery after only eight cycles, so 150 is quite an improvement. They are still a long way from having something ready to sell, and they don't claim otherwise.

about 2 months ago
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Stanford Team Creates Stable Lithium Anode Using Honeycomb Film

WalksOnDirt Re:Stable? (119 comments)

I think you ask too little. What get me are quotes like this;

The team is looking at a price point of $25,000 for an EV battery range of 300 miles, which would be competitive with a 40 mpg gasmobile.

That's not actually what the team said, it is a paraphrase of something Chu said about what is desirable in an EV. The author apologizes in the first comment.

Don't blame the researchers for the idiocy of the article's author.

about 2 months ago
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Stanford Team Creates Stable Lithium Anode Using Honeycomb Film

WalksOnDirt Re:Stable? (119 comments)

150 charge/discharge cycles is not very much. That is only 5 months use.

Initial testing of batteries is usually done at C/20, or less than one cycle per day. I don't know if they sped this up any, but it would still take quite a while for 150 cycles. You're asking too much from a research project.

about 2 months ago
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I typically start my workday ...

WalksOnDirt When I was working... (141 comments)

I used to show up at work before 6 and leave after 19. I only did this three days a week, though. It was totally at my discretion how I put in my 40 hours, but it was too long a drive to do it more often, and driving during rush hours was also not appealing.

But since I am long retired, I chose the last option.

about 3 months ago
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Rising Sea Levels Uncover Japanese War Dead In Marshall Islands

WalksOnDirt Re:Sea Level Hype (182 comments)

By the year 2200, sea level is expected to rise somewhere between 4 and 30 inches.

A more reasonable guess might be around a meter by 2100, plus or minus a half meter. What will happen in 2200 will depend too much on our actions before then to say much.

about 3 months ago

Submissions

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Callisto May Explode

WalksOnDirt WalksOnDirt writes  |  more than 6 years ago

WalksOnDirt (704461) writes "Russian scientist Eduard Drobyshevsky suggests in Pravda that the conductive icy shells of the moons of outer planets can under go electrolysis because of movement through magnetic fields. The resulting hydrogen and oxygen can explode, endangering Earth. He says Titan's explosion 10,000 years ago created Saturn's rings, and when Calisto goes it will lead to nuclear winters on Earth."

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