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Saturday, January 19, 2008
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Wednesday, April 18, 2007
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Wednesday, April 18, 2007
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Wednesday, April 18, 2007
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Wednesday, April 11, 2007
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Ch 4 – Nuclear Waste (Part 4 of 9)
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:: Chicken Little, Robert G. Williscroft, Excerpts
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Okay...we made a political decision back in 1977 that has resulted in piles of long-lived radioactive material that we are not supposed to use for anything. Since the half-life for some of this stuff is around 25,000 years, what we do with it is not trivial. Consider that 25,000 years ago, humankind was barely more sophisticated than modern tribes of great apes. And now we have stuff we need to store for another 25,000 years. If you thought the ozone hole was a political football, check this one out.
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Wednesday, April 11, 2007
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Ch 4 – Breeder Reactors (Part 3 of 9)
468 Views
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:: Chicken Little, Robert G. Williscroft, Excerpts
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In our earlier discussion about how fissile Uranium-235 drives a reactor, we also learned that Uranium-238 participates in the process by transforming into Plutonium-239 which is fissile like Uranium-235. In fact, this isotope of plutonium produces significantly more energy than Uranium-235. And the process continues to produce Plutonium-240 and 241. This raises an interesting question. Can we take these fuel rods that contain all this plutonium, separate out the plutonium and whatever uranium was not used, and make more fuel rods? You bet. In fact, we actually end up with more fuel after the process than what we started with.
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Wednesday, April 11, 2007
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Ch 4 – Nuclear Fission (Part 2 of 9)
548 Views
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:: Chicken Little, Robert G. Williscroft, Excerpts
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Uranium exists in nature, usually as a pitchblende ore. Pitchblende is mildly radioactive from its load of uranium, which means that it spontaneously emits alpha particles. The level of radioactivity is very low, however, so there is no threat from mining and transporting the ore, and in any case, as we learned earlier, alpha particles pose no threat outside the body anyway. The uranium normally extracted from pitchblende typically takes two different forms, called isotopes: Uranium-235 and Uranium-238. The technical difference between them is that Uranium-238 has three extra neutrons in its nucleus than does Uranium-235. About 99.3 percent of uranium in the Earth's crust is Uranium-238; only about 0.7 percent is Uranium-235, along with a trace percentage of four other isotopes. This is important because the 235 isotope of uranium is the basis of most current nuclear power generation.
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Wednesday, April 11, 2007
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Ch 4 – Nuclear Power, Solar Power, and Things Beyond (Part 1 of 9)
491 Views
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:: Chicken Little, Robert G. Williscroft, Excerpts
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Electricity, in its simplest sense, is electrons flowing through a conductor. We're not talking here about high-energy beta particles but about simple electrons moving relatively slowly in lockstep through an elongated piece of metal. We can pass this flow through a tungsten filament under the right conditions, and we get a glowing light bulb. We can pass it through a special rod consisting of several materials, and the rod gets hot – convenient for space heaters and hot water heaters, among other things. By applying a bit of ingenuity, we can create pulsating rotating magnetic fields that will turn a magnet-covered shaft. We call this a motor.
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Tuesday, April 10, 2007
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Ch 3 – The Pool Table (Part 6 of 7)
591 Views
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:: Chicken Little, Robert G. Williscroft, Excerpts
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Remember the little black and white Scottie terrier magnets from your childhood? When placed nose to nose, they repelled each other. Let's conduct a mind experiment. Imagine a pool table with balls that consist of only the noses of these Scottie terrier magnets. Now place them around the table in any configuration you wish. Once you have this picture firmly in mind, imagine rolling one of these "terrier nose" balls across the table. As it moves through your arrangement, other "terrier nose" balls are repelled in all directions, and these repelled balls further repel other balls. By the time your ball reaches the far side of the table, you will have disrupted most of the balls you originally placed on the table.
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| Digg Censors The Dead Hand Over Climate Change! by Jason Williscroft (Saturday, March 31, 2007) |
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