A k Ã— n array with entries from the q-letter alphabet {0, 1, . . . , q âˆ’ 1} is said to be t-covering if each k Ã— t submatrix has (at least one set of) q distinct rows. We use the LovÃ¡sz local lemmaâ€¦ (More)

This article describes mathematical programming models that have been developed and employed to evaluate con2guration strategies for metropolitan ATM telecommunication networks. The models determineâ€¦ (More)

Three bench-scale rock filters containing 0.6 m of gravel were used in this investigation. Two of the filters were planted withSagittaria Iancifolia andScirpus validus, while the third filter was anâ€¦ (More)