%e have measured the ac magnetic susceptibility of the model dilute dipolar-coupled Ising system LiHo„Y& -„F4. The x 0.46 material displays an ordinary ferromagnetic transition, while the x 0.045 and 0.167 samples are two very different magnetic glasses. Thermal relaxation times are more than five times longer for x 0.167 than for x ~0.045. In addition, the more concentrated glass shows history...

Sympathetic cooling of two atomic isotopes is experimentally investigated. Using forced evaporation of a bosonic 7 Li gas in a magnetic trap, a sample of 3 10 5 6 Li fermions has been sympathetically cooled to 9(3) µK, corresponding to 2.2(0.8) times the Fermi temperature. The measured rate constant for 2-body inelastic collisions of 7 Li |2, 2 state at low magnetic field is 1.0

Ultra-fast stochastic cooling (i.e., on microsecond time-scales) would be desirable in certain applications, for example, in order to boost final luminosity in a muon collider or neutrino factory, where even with relativistic dilation, the short particle lifetimes severely limit the total time available to reduce beam phase space. But fast cooling requires very high-bandwidth amplifiers so as t...

Several recent results on cluster cooling flows are discussed, and a number of remaining mysteries are described. Observations of excess soft X-ray provides the only direct evidence for a major repository for the cooled gas. Unfortunately, the frequency of occurrence of large excess columns is uncertain. Excess absorption would affect the interpretation of most X-ray observations of cooling flo...

Wind power is experiencing steady growth, and wind turbine technologies are continually developing. Currently, power ratings of up to 20 MW are being considered for future wind farms. Offshore applications, which call for the largest and most powerful wind turbines, demand a higher standard of reliability and maintainability. Because they offer better overall efficiencies and higher reliability...