1,464 karma · joined March 18, 2013
in all these articles/analysis replace the middle-skill jobs in manufacturing with the programming/IT jobs - the middle-skill jobs of today - and you'd hardly find any decline
As it was already mentioned in the threads like this before, the NIF was built using the technology that was available in those years of the past when NIF was planned and started. Flash lamp pumped lasers are bigger, more expensive and much less efficient, i.e. mere few percents efficiency at best vs. tens of percent efficiency of modern laser diode pumped IR lasers. (Even with such improvement though, i still think laser driven fusion is inferior to many other forms of inertial confinement and much less probable to result in system-level break-even. My personal favorite, Sandia Z-machine is on the scale of 15% efficiency of generating X-ray pulse, and schemes like deep plasma focus or polywell by-pass the energy to radiation conversion stage all together and thus avoid related losses.)
the H-bomb is better-than-breakeven and much smaller than star scale. What you say may be true for Tokamak like confinement schemes whereis H-bomb is inertial confinement, and it works. And it is pretty clear that inertial confinement in several orders of magnitude smaller scale than H-bomb would work too. Look at Sandia Z-machine - an order of magnitude up, and it would get breakeven. Not that anybody really needs it :)
not that i dream about clicking it, i'm just surprised that they still hasn't implemented it yet as current TVs are really computers sold/packaged as TVs.
interesting that a kitten or a puppy gets potty trained much faster than a human child.
If i remember correctly the other party must be a bank.
my understanding that AOL self-insures for medical.
translation:
"According to the title 27 of the Federal Law "On Central Bank of Russian Federation" "the official currency of Russian Federation is rouble. Issue (introduction) of other currencies and currency surrogates on the territory of Russia is prohibited". Anonymous payment systems and cryptocurrencies, including the most popular - Bitcoin, are currency surrogates and can't be used by physical persons and corporations. "
This determination - bitcoin as a currency surrogate - was made by the "expert group" consisting of high level bureaucrats from the enforcement side, ie. Central Bank, FSB, police (police in Russia is one big vertically integrated structure from local to federal level), Attorney General office.
anybody sees any wrong here? Beside private hush-hush, there seems to be the same pattern - like with backdating of options - of optimizing interests of some selected "closer than arm reach" group at the expense of general shareholder population of that company.
sounds like good old corporate email/network/IM account.
Steve Jobs and CEOs in-between kind of make a counter-example.
take a 1B light years radius ball, populate it with density of our Milky Way - that ball will have 1B Schwarzschild radius. Calculation of gravitational potential (escape speed) from it to the rest of the Universe makes sense, doesn't it?. And due to this gravitational potential it will be bona fide black hole from the point of view of the rest of the Universe.
exactly. There is no stationary spacetime in our Universe. Black hole is pretty artificial model where pure mathematical artifacts of singularity at the horizon is taken for the real thing.
> the fact that you can plug the mass of the observable universe into the Schwarzschild radius formula and get a number out does not mean that number has any physical meaning for the universe.
Taking a big chunk of space and calculating escape speed from its gravitational field - how is that not a physical meaning? At what specific size of the chunk you think it becomes not meaningful?
The Schwarzschild radius of the mass of the observable Universe is 10B light years. So, several billions years ago, when observable Universe had 10B radius, it would be a black hole (though i think that in less expanded space of the earlier Universe the constants like "c" had different values and thus that Schwarzschild radius was less). We can imagine it in another way - increase 125 times (the observable Universe has 40+B light years radius) the amount of matter, ie. galaxies, stars, etc... inside the 10B radius ball around us, and you'd get the black hole with 10B light years Schwarzschild radius (and i don't think we would ever notice the change - only with time the galaxies's movement will be affected). Obviously, the gravitational field on the surface of that imaginary 10B radius sphere and inside it would increase somewhat (like 125 times on the surface, 125 times 0 pretty much 0) - not even close though to any values to affect space curvature or to prevent anything from crossing it from inside. Of course, anything that would cross it from inside would return back eventually.
the event horizon is frequently treated as "uncrossable" from inside to outside which is really different from "inescapable". The later means that whatever speed you have on or below the event horizon, you can't reach infinity. The former is just an impression by an outside observer because in his observation the time has stopped on the event horizon, while a stone thrown up from below the event horizon would cross the event horizon just fine on the way up and on the way down and would return back down successfully in its proper time (the point of "inescapability" is that the stone would always return). While above the horizon, the stone can interact with other stuff there and result of this interaction can be observed outside (doesn't mean on practice by us today or tomorrow :).
Many models seems to treat the event horizon as "uncrossable". For example quantum information disappearance - matter goes in, evaporates as Hawking. Yet, just for example, when Hawking radiation decreases the mass of the black hole it causes the shrink of the event horizon and thus whatever "stones"/photons on their way up were stuck (for external observer) in the stopped time of the horizon become free - doesn't mean though that we can observe them on practice as getting out of that gravitational well does take time (again in our time) and redshifts them into oblivion. Like proverbial "the check is in the mail". It is the reason why we can't really observe Hawking radiation until we develop technology to observe light with extremely long wavelength and i just don't have the numbers right now on whether 13B years is enough for the radiation originating right above the event horizon to get out of that well and reach the interstellar space.
http://www.youtube.com/watch?v=1XkJXSoTTb4
50 years ago plane looks more capable as VTOL than F-35. Modern powerful engines allow to drive the fans from the compressor shaft - as F-35 shows - and that would fix the main geometry issue with jet engine placement in XV-5A where fans were driven from jet exhaust.
For example: http://marriage-and-immigrationlaw.blogspot.com/2007/09/must...