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Coping At The Crossroads: Societal And Educational Transformation, Glenn E. Baker, Richard A. Boser, Dan L. Householder
Coping At The Crossroads: Societal And Educational Transformation, Glenn E. Baker, Richard A. Boser, Dan L. Householder
Engineering Education Faculty Publications
As the nature of a workforce changes over time, one broadly-defined group of workers diminishes in numbers while another group increases in numbers. For example, during the period 1890-1910, the major proportion of the workforce in the United States shifted from agriculture to industrial production (U.S. Bureau of the Census, 1975). Figure 1 presents the concept. Relentless technological developments gave rise to new job classifications and to increased employment opportunities in industrial production. At the same time, technological developments diminished employment opportunities in another field, in this case, agriculture. Over the long term, then, one might expect that demand for …
Photosynthesis And Leaf Morphology Of Liquidambar Styraciflua L. Under Variable Urban Radiant Energy Conditions, Roger Kjelgren, James R. Clark
Photosynthesis And Leaf Morphology Of Liquidambar Styraciflua L. Under Variable Urban Radiant Energy Conditions, Roger Kjelgren, James R. Clark
Plants, Soils, and Climate Faculty Publications
Diminished sunlight, characteristic of urban canyons, has been suggested as being potentially limiting to plant growth. This study investigated the response of sweetgum (Liquidambar styraciflua L.) to variable irradiance in a range of urban locations. Diurnal photosynthesis was measured in situ on mature trees, comparing an open site at an urban park with an urban canyon that received 4 h of midday sun in midsummer. Photosynthesis for trees growing in the canyon was lower both during shaded and sunlit periods compared with trees at the park. Photosynthesis of detached shoots in a growth chamber was greater in canyon than park …
Cambial Electrical Resistance Does Not Assess Vitality Of Individual Sweetgum Trees, James R. Clark, Roger Kjelgren, J. Hushagen, J. Fiore
Cambial Electrical Resistance Does Not Assess Vitality Of Individual Sweetgum Trees, James R. Clark, Roger Kjelgren, J. Hushagen, J. Fiore
Plants, Soils, and Climate Faculty Publications
Cambial electrical resistance (CER) was assessed over a year-long period, using the Shigometer, for 109 sweetgum trees (Liquidambarstyraciflua) planted along streets in Seattle, Washington. CER decreased through the spring, reached a minimum in summer, increased through the fall and was maximal in mid-winter. The seasonal maximum was 200-600% greater than the summer minimum. CER measurements could not be related to growth parameters such as seasonal shoot increment and diameter growth.