- Popular-level introduction to the five methods used to identify exoplanets.
- Another good profile of the SEP.
- ArXiv gets some money to improve stuff.
- Flying fish are hard to believe. It’s something of a tragedy that fish capable of long-distance flight never evolved (that we know of?). They are so bird like it’s startling, and this ability has evolved independently multiple times.
- In addition to Russia and China, the US also at one time had ICBMs deployed by rail.
On nuclear decommissioning:
For nuclear power plants governed by the United States Nuclear Regulatory Commission, SAFSTOR (SAFe STORage) is one of the options for nuclear decommissioning of a shut down plant. During SAFSTOR the de-fuelled plant is monitored for up to sixty years before complete decontamination and dismantling of the site, to a condition where nuclear licensing is no longer required. During the storage interval, some of the radioactive contaminants of the reactor and power plant will decay, which will reduce the quantity of radioactive material to be removed during the final decontamination phase.
The other options set by the NRC are nuclear decommissioning which is immediate dismantling of the plant and remediation of the site, and nuclear entombment which is the enclosure of contaminated parts of the plant in a permanent layer of concrete.Mixtures of options may be used, for example, immediate removal of steam turbine components and condensors, and SAFSTOR for the more heavily radioactive containment vessel. Since NRC requires decommissioning to be completed within 60 years, ENTOMB is not usually chosen since not all activity will have decayed to an unregulated background level in that time.
- The fraction of the federal budget devoted to NASA peaked in 1966, three years before the Moon landing.
LaTeX in commentsInclude [latexpage] to render LaTeX in comments. (More.)
- Links for August-September 2017 (2)
- How to think about Quantum Mechanics—Part 1: Measurements are about bases (8)
- Jess Riedel Thanks Peter! Although their paper (Jan 2016) predates this post (Nov 2016), this post is... – Sep 07, 4:58 PM
- Peter Morgan This morning, we have this in a Springer notification e-mail, https://link.springer.com/article/10.1007/s40509-016-0098-2, "Are observables necessarily Hermitian?"... – Sep 07, 7:04 AM
- How to think about Quantum Mechanics—Part 3: The pointer and Schmidt bases (5)
- How to think about Quantum Mechanics—Part 7: Quantum chaos and linear evolution (14)
- Josh Deutsch Hi Jess, I think anyone interested in reading about ETH is likely to understand that... – Sep 03, 6:50 PM
- Jess Riedel Hi Josh, On your prodding, I have now restored that section on the ETH Wikipedia... – Sep 03, 5:53 PM
- Josh Deutsch Hi Jess, Thanks for considering what I wrote so carefully. I get the impression that... – Sep 03, 2:27 PM
- Jess Riedel I'm happy to retract this sentence of mine: "But isn’t it true that quantum systems... – Sep 03, 1:49 PM
- Jess Riedel Hi Josh, Thanks for walking me through this. I have broken my response into two... – Sep 03, 1:49 PM
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