Sensitivity analysis enables powerful gradient-based mathematical programming techniques in the optimization of electromechanical products with respect to electromagnetic compatibility requirements. We present a sensitivity method based on finite element solutions both magnetoquasistatic system tree-cotree gauge and an electrostatic system. A repeated application adjoint ensures high computatio...

We propose two new greedy algorithms to be used by software clients running the BitTorrent peer to peer protocol: a new peer selection algorithm and a new piece selection algorithm. We provide experimental results showing that the proposed algorithms are better than the ones currently in use. When used together in our experiments, the algorithms decreased the expected download time by ??% on av...

The upper layer formed on the surface of theslow sand filter does not appear to play the most important part in bacteriological purification. The sand filters at Pulta, with a capacity of about 99 million gallons daily, offer an excellent opportunity to study such actions, as it sometimes becomes necessary to rake a running filter when it tends to choke, which rapidly diminishes the rate of fil...

Defects in the mitochondrial AAA protease family member, paraplegin, result in an autosomal recessive form of hereditary spastic paraplegia (HSP). In this issue of Cell, Nolden et al. (2005) report a new molecular mechanism for HSP based on the requirement of paraplegin for the proteolysis of a specific mitochondrial ribosomal protein. The processing of this substrate is required for robust tra...

The association between drugs and crime in the public mind is so strong that a recent psychology experiment showed the word “drug” tightly linked to such words as “choke,” “knife,” “fight,” and “wound” in participants’ associative memory networks (Bushman, 1996). Although it is routine in academia to deride public ignorance of all things criminological, in this case the public is hardly deluded...