Environmental concerns have renewed the interest in electric vehicles. To gain
widespread use, electric vehicles will also have to offer good performance and be
reasonably priced. AC drive systems using modern semiconductors can provide
efficient operation at the required power levels, but their cost at present is still too
high....
Differences in primary production and periphyton and macroinvertebrate
biomass between pairs of constrained (valley floor width of less than twice the active
channel width) and unconstrained reaches were investigated in Elk River and four
tributaries in southwest Oregon. In August 1991, macroinvertebrates were sampled
from individual cobbles, and rocks were...
In an effort to elucidate the mechanism responsible for large-scale
zooplankton variability in the California Current, zooplankton biomass and
hydrographic data from the California Cooperative Fisheries Investigation
data set and wind data from Fleet Numerical Oceanography Center model
analyses have been used to construct a box model biomass budget. The...
