Catch up on stories from the past week (and beyond) at the Slashdot story archive

 



Forgot your password?
typodupeerror
×
Technology

MIT Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati 110

rtoz (2530056) writes Researchers at MIT have developed a new spongelike material structure which can use 85% of incoming solar energy for converting water into steam. This spongelike structure has a layer of graphite flakes and an underlying carbon foam. This structure has many small pores. It can float on the water, and it will act as an insulator for preventing heat from escaping to the underlying liquid. As sunlight hits the structure, it creates a hotspot in the graphite layer, generating a pressure gradient that draws water up through the carbon foam. As water seeps into the graphite layer, the heat concentrated in the graphite turns the water into steam. This structure works much like a sponge. It is a significant improvement over recent approaches to solar-powered steam generation. And, this setup loses very little heat in the process, and can produce steam at relatively low solar intensity. If scaled up, this setup will not require complex, costly systems to highly concentrate sunlight.

Comment Re:This propaganda is worse than 2003 Iraq fiasco. (Score 2) 667

I suppose I'm discussing with some ukrainian "patriot".

A Finn who saw the scars your attempt to conquer our country left on innocent people. And now you're doing the exact same thing again - you prop up a puppet regime and have it request help. Only your puppet got ousted, so now you're going with plan B: russian troops posing as rebels.

Uncle Sam wants to fight "bad russkies" and he wants to do this with your hands beacuse it's cheaper.

You're wasting your time. Everyone who has the bad luck to live next to Russia knows the truth about you.

I'm a Pole - that's why I'm freaking out.

And Otto Wille Kuusinen was a Finn and Vidkun Quisling was a Norwegian. Good luck on your chosen career.

I want no part in this madness.

Then stop working for a madman.

Comment Re:Texas? (Score 1) 172

No state income tax for businesses.

Really, this plant is building components for the cars built in California. There is actually no relation from the manufacturing side to the selling side here.

This decision should be made puerilely on balance sheet issues that allow Tesla to make batteries and cars as cost effectively as they can.

Comment Re: Hmmm (Score 1) 205

We have a minivan. We got it just before our first child was born 11 years ago. It was quite handy during the years when the kids required a ton of stuff for trips (stroller, seat to eat in, portable crib, ton of diapers, etc). Now it is overkill and the low mileage makes it expensive to drive on long trips. When the time comes to replace it, we're definitely getting something with better mpg.

Comment Re:Local testing works? (Score 3, Insightful) 778

I'm so glad to see they can now sit and accomplish nothing under a welfare system that pacifies them by providing their basic needs and no more, while providing a disincentive to actually bettering themselves.

But if they bettered themselves, they would not be picking produce for sub-subsistence wages, now would they? So those poor farmers would still have to ship in exploitable people so you could keep getting produce for below its actual cost of production. Which is what this is really about: you want stuff for below its actual cost, even if this means exploiting desperate people.

In other words, you are against minimum wage because it makes it harder to transfer wealth from poor people to you. Damn looter.

Comment Re:This propaganda is worse than 2003 Iraq fiasco. (Score 1) 667

Should Putin want to invade Ukraine, he'd conquer it in a week or two.

Which is what he already did to Crimea, and is now trying to do to East Ukraine. Putin is an evil overlord, not an idiot; he'll gobble up what he can without drawing too much aggro, then wait for the next opportunity.

The problem, of course, is that sooner or later he'll miscalculate the reaction, like Germany did in 1939, and then another world war will start.

Comment Re:Do you have any hands-on experience ? (Score 1) 667

1. Who disabled the safety lock, and on what authority?
2. Who fired the missile, and on what authority?

Putin's servants on Putin's authority. The real question is whether this was an intentional revenge for the sanctions, or merely typical Russian lack of concern for human lives. Either way, the poor bastards on the plane are simply collateral damage in Putin's Soviet Empire Rebuilding Project.

Comment Re:This propaganda is worse than 2003 Iraq fiasco. (Score 4, Insightful) 667

Second, given amount of hate western media spewing against Russians and China right now, I see the great war coming.

Dunno what China has to do with any of this, but if you fear a war is coming, maybe you should tell Putin to stop? Because he's the one hell-bent on conquering his neighbours, which is what this is about.

Comment The one good feature of ARM (Score 4, Interesting) 108

NASA's vaunted "Asteroid Redirect Mission" is now widely regarded as crap. It doesn't give us any new knowledge, it's not a good intermediate step for human colonization of space, and it's been mismanaged so badly that you could tell me it had been infiltrated by Russians intent on destroying America, and I wouldn't much doubt it.

But it does have one saving grace: it's our best shot if we ever find an asteroid headed for Earth impact.

I found this out sort of by accident - I was playing Kerbal Space Program, which has a NASA-sponsored module for doing asteroid redirects. I had a ship designed for that in orbit, and was looking for a good target.

I found one. On a direct intercept course. About a week out.

To make things worse, it was at like 80 degrees inclination. To cut a very long story short, I managed to redirect it to aerobrake, then stabilized the orbit so it wouldn't eventually deorbit.

Now, I fully realize that was a game, and that rocket science is actually a lot more complex than strapping a shitload of boosters to everything (my standard design). But the basic principle remains - something that can redirect an asteroid to enter lunar orbit is also something that can redirect an asteroid off of an impact course.

I don't know if that fully justifies the program - it's an absurd expense for what we get. On the other hand, what price can we put on avoiding extinction?

Comment Re:cause and/or those responsible (Score 0) 667

Nothing is objectively known about the airliner. Everything, from Ukrainian air traffic control ordering the plane to descend to a dangerous altitude to who detected what, is all supposition and hearsay at this point.

It is my personal suspicion that the Ukrainian authorities were hoping for an accident of this sort and were intent on placing a civilian airliner in as dangerous a position as possible. Whether that was the case for this specific airliner on this specific flight is unclear.

And I'd argue that Korean Airlines 007 is a better example for this reason. The US had been using civilian airliners for spying on Russia for some time and doctored the evidence to remove Russian pilots radioing warnings to the aircraft in order to make the incident more incriminating than it was. Whether that flight was used for spying, was shadowed by such an aircraft, or merely happened to be in the wrong place at the wrong time, all becomes incidental. The accident was inevitable and the US government of the time was guilty of ensuring civilians would someday die for the benefit of military intelligence. It was merely a matter of which plane would be blown out of the sky and when.

In this case, the Ukranian authorities deliberately downplayed the risk of missile attacks on overflying aircraft and deliberately worked to place aircraft in the most dangerous air corridors that the airlines would permit. That is indisputable. Their opponents were known to be firing on aircraft and had shot several down. When your time to respond is measured in milliseconds, the nearest aircraft identification guide is mere hours away, to paraphrase what Americans often say about cops.

An accident was inevitable. The separatists weren't interested in avoiding one, the Ukrainian authorities certainly weren't. It was merely who would die for someone else's ideals. Whether or not this aircraft was deliberately placed in the path of a SAM battery is unimportant.

Both sides are therefore guilty. Both sides deserve blame.

Comment Re:Crazy (Score 2, Interesting) 778

The automation at least gives the benefit of hiring engineers, but far less engineers are hired than the large number of low wage workers who are fired.

You know, we could solve all these problems with unconditional basic income sufficient to live tolerably on. Then we could remove minimum wage entirely and appreciate automation as liberator of humanity from toil rather than fearing it as a threat. At the same time, it would smooth out the boom-bust cycle by guaranteeing a level of economic demand.

Our current model of employment is an artifact of Industrial Era, and is quickly becoming obsolete in our post-Industrial one, which is the ultimate cause of our economic problems.

The jobs lost overseas are just lost. And not only low wage jobs are lost, because as the cost of living increases on the engineers then those jobs start to go away as well.

So basically, if you work for a living, you're screwed.

Comment Re:Crazy (Score 1) 778

I dont believe that at all. one should not be paid 20 buck an hour to pick apples, or take an order at mcdonalds, the job is not worth that much, if it were our food would cost double and we would be in the same boat. just because you now make 50 grand instead of 25 sounds good, but if the cost of everything goes up to match that change, whats the point??

Well, for starters, if a McDonald's employee needs food stamps to live, then I'm subsidising McDonald's from my taxes: I'm paying part of the income of their employees. Same goes for apple-pickers, and every other job for that matter.

Allowing a company to pay a lower than living wage results in a massive market failure, and consequently waste of resources. It's much better to force McDonald's and your local apple farm to charge the customers the price of resources - including human resources - it actually takes to deliver their product, and let market decide if it's worth them. An employee must be able to live on his wage alone with a tolerable quality of life, otherwise the employer is simply a parasite upon the economy.

Slashdot Top Deals

You must realize that the computer has it in for you. The irrefutable proof of this is that the computer always does what you tell it to do.

Working...