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Comments

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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 a week ago
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Seagate Ships First 8 Terabyte Hard Drive

WalksOnDirt Re:Can we get a tape drive to back this up? (315 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 a week 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 two weeks 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 two weeks 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 two weeks 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 a month 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 a month 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 a month 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
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Future of Cars: Hydrogen Fuel Cells, Or Electric?

WalksOnDirt Re:Electric. (659 comments)

...this for ex (300 miles of power) which was just announced...

There is a lot of marketing speak at your link, and very little technical information. Some of it is just wrong, like the implication that rare earths are heavily used in batteries. My bet is it is a scam.

about 4 months ago
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Al Franken Says FCC Proposed Rules Are "The Opposite of Net Neutrality"

WalksOnDirt Secret! (282 comments)

Way to go, Al. The stupidity of your colleagues was supposed to be a secret!

about 4 months ago
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Why Hollywood's Best Robot Stories Are About Slavery

WalksOnDirt Re:Add "Small Wonder" to the list... (150 comments)

I watched the show. I may have missed the final episode (I don't remember) but it definitely lasted more than one season. It was a lighthearted children's show, and your ending would be completely out of character for it. I believe Wikipedia.

about 4 months ago
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Stanford Getting Rid of $18 Billion Endowment of Coal Stock

WalksOnDirt Re:Divest of Electrical Use Too? (208 comments)

Not much electricity comes from burning coal out Stanford's way.

about 4 months ago
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Siphons Work Due To Gravity, Not Atmospheric Pressure: Now With Peer Review

WalksOnDirt Re:Actually it's both. (360 comments)

Pure water, without any dissolved gasses, has a substantial tensile strength. It is not theoretically stable, but in practice it is. Enough so that a siphon will work in a vacuum.

Such pure water is hard to find, though.

about 4 months ago
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The GNOME Foundation Is Running Out of Money

WalksOnDirt Re:Gnome go home (693 comments)

They're broke.

Indeed, but you should also mention it should have been "you're broke". It's obvious, of course, but it happens so often that some might have missed it.

about 5 months ago
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Tesla: A Carmaker Or Grid-Storage Company?

WalksOnDirt Re:Panasonic (151 comments)

The current Tesla cells are too expensive for grid storage. Nickle and cobalt are not cheap. Nothing says they can't make two types of batteries though, nickle cobalt for cars and manganese dioxide or iron phosphate for the grid. Or they could have a nice lithium sulfur chemistry they could use for both; there has been a lot of recent development in that area.

about 5 months ago
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Einstein's Lost Model of the Universe Discovered 'Hiding In Plain Sight'

WalksOnDirt Re: How big is it? (118 comments)

We do it now. What is NaN/NaN? NaN.

about 6 months ago

Submissions

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Callisto May Explode

WalksOnDirt WalksOnDirt writes  |  about 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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