Boppana B89] proves a lower bound separating the PRIORITY and the COMMON PRAM models that is optimal to within a constant factor. However, an essential ingredient in his proof is a problem with an enormously large input domain. In this paper, I achieve the same lower bound with the improvement that it applies even when the computational problem is deened on a much more reasonably sized input do...

For metallic single crystals with dimensions in the micrometer and sub-micrometer regime, systematic studies have established that sample size has an obvious influence on the apparent strength, following a “smaller is stronger” trend. For amorphous metals, several metallic glasses (MG) appear to exhibit a similar trend, while a few others do not. Here, another MG is examined, Al88Fe7Gd5, using ...

Maximum food-chain length has been correlated with resource availability, ecosystem size, environmental stability and colonization history. Some of these correlations may result from environmental effects on predator-prey body size ratios. We investigate relationships between maximum food-chain length, predator-prey mass ratios, primary production and environmental stability in marine food webs...