As far as the tile roofs, they last a long time. It isn't the tile that is the issue, it's the felt (or paper) underneath that gets replaced. Mine is 25 years old, has not been replaced yet. Some neighbors have had theirs redone, but many have not as yet. 04-06-2011, 12:00 AM.
Particle Accelerators Could Be Used to Produce Energy (and Plutonium) Particle accelerators, which are not renowned for their real-world applications, could in fact be used to produce energy, according to a 34-year-old research paper that resurfaced this week.
A linear particle accelerator consists of the following elements: 1  The particle source. The design of the source depends on the particle that is being moved. 2  A high voltage source for the initial injection of particles. 3  A hollow pipe vacuum chamber. The length will vary with the application.