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Analysis

1995

Articles 1 - 2 of 2

Full-Text Articles in Engineering

Preliminary Pumping Strategy Analyses For Southeastern Cache Valley, Utah And River Baseflow Impacts, Shyamal B. Chowdhury, Richard C. Peralta Apr 1995

Preliminary Pumping Strategy Analyses For Southeastern Cache Valley, Utah And River Baseflow Impacts, Shyamal B. Chowdhury, Richard C. Peralta

Civil and Environmental Engineering Faculty Publications

US/REMAX, a linear optimization model for groundwater management, is used to compute preliminary optimal sustained groundwater pumping increases for southeastern Cache Valley. US/REMAX employs the response matrix method of representing system response to stimuli as constraint equations within an optimization problem. The management objective is to maximize groundwater extraction at four specified locations subject to constrai~ts on aquifer potentiometric head, aquifer/river interflow, and the water level in the uppermost aquifer layer. Four scenarios (constraint sets) are presented. The results are most sensitive to the aquifer/river interflow constraints. Interflow is deemed important because baseflows are crucial to satisfying fish, aquatic life, …

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Spectroscopic Analysis Of Chain Conformation Distribution In A Biodegradable Polyester Elastomer, Poly(Beta-Hydroxyoctanoate), William Macknight, Hun Jan Tao, K. D. Gagnon, R. W. Lenz, Shaw L. Hsu Dec 1994

Spectroscopic Analysis Of Chain Conformation Distribution In A Biodegradable Polyester Elastomer, Poly(Beta-Hydroxyoctanoate), William Macknight, Hun Jan Tao, K. D. Gagnon, R. W. Lenz, Shaw L. Hsu

William MacKnight

Chain conformational distribution of a biodegradable polyester elastomer, poly(p-hydroxy­octanoate) (PHO), has been analyzed using vibrational spectroscopy in conjunction with normal vibrational analysis. For the as-prepared, mainly amorphous materials, side-chain conformation distribution is extremely broad and is consistent with the expected three-state rotational isomeric model. On the basis of our vibrational analysis, we have established that side-chain conformational distribution transforms to one containing mainly the extended form after thermal annealing. In contrast, the conformational distribution of the side chains remains unchanged as a function of strain. Additionally, the carbonyl stretching vibrations were found to be sensitive to changes in the crystalline …

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