Reduction of stratospheric ozone caused by human
perturbation with halocarbon compounds and the consequent
increase in mid-wavelength ultraviolet radiation (UV-B
radiation. 290-320 nm) reaching the earth's surface could
have deleterious ecological effects on marine primary
producers. Unialgal and mixed cultures of Thalassiosira
pseudonana and Thalassiosira weisflogii were exposed to
three...
The focus of this paper is on the underlying knowledge base for an intelligent tutorial system for high school algebra problems. We present a model of problem solving flexible enough to account for a variety of problem solving behaviors and general enough to allow new problem domains to be defined...
Published May 1982. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Revised April 1985. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Rockfishes, Sebastes spp.. were the most numerous and speciose fishes seen during 16 submersible dives from 64 to 305 m depth in the vicinity of Heceta Bank off the coast of Oregon. Dense schools of juvenile rockfishes and large yellowtail rockfish, S. flavidus, were observed only over rocky, high relief...
Revised May 1983. Reprinted January 2000. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog