nuclear
sastyk | March 14, 2011As things unfold, there will be more to say about the terrible situation in Japan and its effects in the both the present and the future, but for now, Nicole Foss (aka Stoneleigh in her super financial analyst extraordinaire identity, and nuclear safety expert...is there anything she can't do?) of The Automatic Earth has done a superb review of what we know, what we don't know and the consequences we can anticipate. Very, very important! The comments at The Oil Drum are also often quite valuable. I think particularly useful is her evidence that this was not an unpredictable "black swan"…
catdynamics | April 29, 2010NASA loses a balloon in the outback
The Nuclear Compton Telescope (PI Boggs at UCB's SSL), a soft γ-ray telescope designed for balloon launch, observations in the stratosphere, and recovery, crashed because of a wind gust during an attempted launch in Australia earlier today.
ABC News (Oz) on youtube
NCT is an wide field imaging telescope with polarization capability.
Science goals were galactic nuclear emission lines for studies of nuclear synthesis in supernovae, and γ-ray polarization studies.It flew last year out of the SFBF in New Mexico - guess they were going after southern sources…
drorzel | April 19, 2010What's the application? The goal of laser ignition fusion experiments is to heat and compress a target to the point where the nuclei of the atoms making up the sample fuse together to form a new, heavier nucleus, releasing energy in the process. Nuclear fusion is, of course, what powers stars, and creating fusion in the laboratory has been the holy grail (well, a holy grail, at any rate) of nuclear physics research for the last sixty-plus years.
What problem(s) is it the solution to? 1) "Can we create fusion reactions in a laboratory setting on Earth?" 2) "How can we get more helium without…
revere | April 7, 2010If you aren't an epidemiologist of a certain age -- or even if you are -- you've probably not heard of Alice Stewart. Alice was one of England's premier epidemiologists in the mid to late 20th century, but I didn't meet her until she was in her 80s. At the time she could still bound up the two flights of stairs to my office like a teen in good shape. I'm not exaggerating. She literally took it at top speed and without becoming breathless. When she died at age 95 in 2002, obituaries frequently described her as "indefatigable," and she was certainly that. "Boundless energy" might be another…
emjohnson | August 5, 2009Japanese artists' depiction of the horrors at Hiroshima.Hiroshima Peace Memorial Museum
On August 6, 1945 the United States dropped "Little Boy," the first of only two nuclear bombs ever used in warfare, on the Japanese civilians at Hiroshima. In an instant flash of light an estimated 140,000 people were either incinerated or suffered an agonizing death that lasted several days. The standard mythology is that President Truman dropped the bombs at Hiroshima and Nagasaki (three days later on August 9) in order to avoid having to send half a million American soliders to their deaths in a…
revere | September 4, 2008McCain wants to go full speed ahead for nuclear power (that's a maverick's way of dealing with climate change?) and Obama seems to feel friendly to it, too, as long as the waste disposal issue can be solved, satisfactorily (which it doesn't seem it can be, but that's another story). Everyone agrees that nuclear power has to be managed safely if we are going to rely on it to any extent and we are always given assurances that this is not only possible but what happens as a matter of course, no exceptions. To make sure, government plans are reviewed by independent experts. Too bad we can't see…
esiegel | May 8, 2008Let's say we're having a nice day here on Earth; the Sun is shining, the clouds are sparse, and everything is just looking like a peach:
And then Lucas goes and tells me,
Oh my God, Ethan! It's Armageddon! An asteroid is coming straight for us! You've got to stop it!
Really? Me? Well, how would I do it? Let's say we've got some reasonably good asteroid tracking going on, and we've got about 2 months before the asteroid is actually going to hit us. We'd like to do something with the situation on the left, to avoid the situation on the right:
Well, what we really have to do is change the…
esiegel | April 16, 2008Ahh, stars. Giant furnaces of nuclear fusion. Doing the stuff our Sun does, burning hydrogen fuel into helium (among other things) and emitting lots of visible light and energy in the process.
But when we take a look at brown dwarfs, they aren't like normal (i.e., main sequence) stars like our Sun. Instead of burning hydrogen into helium for their fuel, brown dwarfs don't generate enough pressure to make that happen; they can only burn hydrogen into deuterium.
Let's go over what the differences here are. A hydrogen nucleus is just a proton, with a mass of 938.272 MeV/c2. (I use these units…
revere | January 21, 2008We now know that Pakistan sold nuclear secrets to Libya and North Korea and who knows who else. The assumption was that the nuclear secrets were Pakistan's. AQ Khan, head of the Pakistani nuclear program gets the blame (or the credit; he is considered a national hero in Pakistan). Nuclear secrets sold to the highest bidder by a corrupt government official. Good thing US officials don't do that. Or do they?
The FBI has been accused of covering up a key case file detailing evidence against corrupt government officials and their dealings with a network stealing nuclear secrets.
The assertion…