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Comment: Might use batteries too (Score 1) 260

by grimJester (#47853757) Attached to: Tesla Plans To Power Its Gigafactory With Renewables Alone
Obviously a battery factory will have some amount of batteries on site. The 2400 MWh/day figure from the article would be around 30 000 full Model S battery packs, so going completely off-grid using whatever batteries they have lying around is unfeasible. Anyway, no point in not using them, right?

Comment: Don't batteries just compete against gas turbines? (Score 1) 245

by grimJester (#47802251) Attached to: Power Grids: The Huge Battery Market You Never Knew Existed
Can't the wind farms just use gas turbines instead of batteries as long as those are cheaper? I'd assume batteries will be used if/when they become the cheapest way to handle the balancing.

Some day soon, in some areas, there will be enough solar to handle most power needs at peak insolation. When that happens, we'll have significantly cheaper grid power in the day than during the night. Then we'll see how much of the balancing water can do and if batteries can outcompete gas for the rest.

Comment: Fresh water less dense, more volume per weight (Score 1) 302

by grimJester (#47800723) Attached to: Study: Antarctic Sea-Level Rising Faster Than Global Rate
If you have a source of melting fresh water, water around it will be slightly higher as long as the melting continues, as it takes time for the meltoff to mix with the rest of the ocean. It's just a 2mm difference over maybe a thousand km of sea (which is why the intuitive "should immediately even out" idea doesn't work) so I doubt you could make the same effect visible in a bathtub.

Comment: Don't use Peter Woit as a authority... (Score 1) 259

by grimJester (#47607707) Attached to: The Man Who Invented the 26th Dimension
Woit has written a book called "Not even wrong" about string theory and how it's not science in his opinion. He actively blogs about string theory hype. He's not a string theorist and although he does have a PhD in physics he's not published anything scientific in decades. He teaches math and writes anti-string rants as a hobby.

Comment: LEP was 209 GeV (Score 2) 219

by grimJester (#47515033) Attached to: China Plans Particle Colliders That Would Dwarf CERN's LHC
This is a pretty small upgrade from the LEP that used to be in the current LCH tunnel. That went up to 209 GeV and ruled out Higgs masses up to 115 GeV. The Higgs is around 125 Gev, or 9% higher, and the energy of this is supposed to be 240 GeV, or 15% higher.

That makes me wonder if the planned energy is enough for a useful Higgs factory. The ILC is supposed to do 500 GeV and would work well as a Higgs factory. That proposal would be more than twice as expensive though.

It's of course possible the article has it wrong and it's really 240 GeV per beam, adding up to 480.

Comment: Article with explanation for laymen (Score 5, Informative) 188

by grimJester (#47313829) Attached to: The Higgs Boson Should Have Crushed the Universe

The mathematics to arise from accepted Higgs field theory suggests the universe is currently sitting comfortably in a Higgs field energy 'valley.' To get out of this valley and up the adjacent 'hill,' huge quantities of energy would need to be unleashed inside the field.

I have no idea what the 'valley' represents, nor the 'hill' so this explanation tells me nothing.

An article by Matt Strassler that should explain more. In particular, this pic

The story about our vacuum having two 'valleys' depends crucially on no new physics existing beyond the already known fields, which is probably false.

Comment: Equations, not algorithm (Score 1) 85

by grimJester (#47270115) Attached to: The Game Theory of Life
"equations used to describe the distribution of genes", meaning the algorithm (mechanism) was probably unknown while the equations just described the end result. Also, the behavior of an algorithm that sees lots of use has probably been studied a lot so there's a treasure trove of material for researchers to dig through to find stuff relevant for genetics.

Comment: But.. (Score 1) 291

all animal species alive now have survived all climate changes in the past.

But almost no animal species alive in the past have survived all the climate changes in the past.

More seriously, they want to optimize meat per dollar taking into account projections of future climate. A current cow would probably do well but be suboptimal. Normal economics at work, nothing to see here.

APL is a write-only language. I can write programs in APL, but I can't read any of them. -- Roy Keir