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Comment Bremsstrahlung effect? (Score 2, Interesting) 70

Xrays produced by the Bremsstrahlung effect are proportional to the voltage of free-electrons hitting an atom. That is, a 30kV electron would produce X-ray light with a spectrum centered in 30kV.

Rays have millions of volts and should be expected to produce X-rays of mega-electronvolts energy, this is gamma-ray energy levels.

But Bremsstrahlung needs vacuum, so I probably don't know what I'm talking about.

Comment Opera Developer (Score 0) 181

Firefox is dog slow in Ubuntu box (Core I5!) always taking 20%-30% cpu.
Chrome, not much better. Just tried Opera Developer (chromium based I believe) and the difference is abysmal. 0% cpu at idle, fast as lightning, I installed lots of plugins into Opera and it still it consumes no CPU. Why Firefox or chrome can't be like this?

Comment Re:Link to the NIF Status Update (Score 2) 429

From your link:

>The shot resulted in the highest DT neutron yield obtained to date, estimated at nearly 3 × 1015 (three quadrillion), or almost 8,000 joules of fusion energy

And then:

>All 192 NIF beams delivered 1.7 megajoules (MJ) to the hohlraum

That doesn't look like break even...

Comment Re:More like Gamma-ray devices (Score 2) 113

Fair enough, just two questions:
1) An electron hitting an atom will produce photons with the same energy via the Bremsstrahlung effect. As electrons will hit atoms sometimes, 300 MeV electrons means you will have 300 MeV photons, right?
2) How much energy a photon needs to transmute an atom? I believe it's lower than 300 MeV (but as a commenter said, it's 300 MeV *per meter* so really you need a lot of those devices chained together for them to become dangerous, I guess)

Comment Overdesigned (Score 1) 97

That huge CPU coupled with the memory and flash disk has to consume arround 200mw, no way it can last more than 1 hour on that tiny battery.
IMHO cramming a 500 MB Linux distro into something that is basically a proxy for google services is a complete waste of resources.

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