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2004

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Modeling The Hydrologic And Particulate Loadings From Paved Urban Surfaces, Chad Michael Cristina Jan 2004

Modeling The Hydrologic And Particulate Loadings From Paved Urban Surfaces, Chad Michael Cristina

LSU Doctoral Dissertations

This dissertation details the results of recent investigations concerning non-colloidal particulate matter found in urban rainfall-runoff and urban snowmelt. Three forms of the power law model (PLM) were used to model particle number density. It was found that significant model error could be introduced into PLMs when the median diameter particle was used to estimate the number of particles per interval, but the SSE of continuous PLMs could be significantly reduced through the use of correction factors when the sieve interval was large (P<0.05). Additionally, a multiple PLM analysis may be more appropriate than a single PLM analysis when changes in particle population occur within a single gradation. PLMs were also used to model the relationship between cumulative granulometric mass and cumulative particulate-bound metal mass. The use of such calibrated PLMs provided considerable cost reduction when compared to conventional direct measurements of particulate-bound metal mass. A first flush analysis indicated that only events with average volumetric flow rates approaching 1 L/min/m of drainage width exhibit a rapid depletion of particulate matter consistent with the concentration-based definition of the first flush. An analysis of particle separation mechanisms indicated that 90% of these particles, by mass, could be removed from the discharge with detention times of 30 min and 120 min for snowmelt and rainfall-runoff, respectively, in a typical roadside drainage system. It was also found that the kinematic wave model could accurately model significant aspects of rainfall-runoff events in traffic-impacted watersheds provided that abstractions were incorporated into the modeling process. For this watershed the source of abstraction was attributable to vehicular traffic. For high-intensity events with more than 10 vehicles per runoff volume (VPV) the runoff coefficient varied between 0.6 and 0.9 while for low-intensity events with fewer than 10 VPV the coefficient ranged between 0.2 and 0.4.

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The Effect Of Beta-Carotene Vitamin E, And Vitamin C Supplementation Upon Work Capacity During A Protocol Of Arm Curl Exercise Using The Biodex Dyanamometer, Ivan Kenyon Guillory Jan 2004

The Effect Of Beta-Carotene Vitamin E, And Vitamin C Supplementation Upon Work Capacity During A Protocol Of Arm Curl Exercise Using The Biodex Dyanamometer, Ivan Kenyon Guillory

LSU Doctoral Dissertations

The effect of acute and chronic supplementation upon work capacity in trained and untrained subjects was examined using 10 normal healthy subjects (ages 19-23). The subjects were tested using a double-blind crossover design. During the two supplemental stages subjects ingested either the placebo or antioxidant mixture capsules (beta-carotene, vitamin C, vitamin E). There was a 28 day washout period between the two supplemental stages. Subjects were tested during each stage for an acute effect (one day of supplementation) and chronic effect (twenty-eight days of supplementation). Testing consisted of seven sets of arm curl exercises with a 60-second rest period between …

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Social Protests, Asocial Media: Patterns Of Press Coverage Of Social Protests And The Influence Of The Internet Of Such Coverage, Sonora Jha Nambiar Jan 2004

Social Protests, Asocial Media: Patterns Of Press Coverage Of Social Protests And The Influence Of The Internet Of Such Coverage, Sonora Jha Nambiar

LSU Doctoral Dissertations

This dissertation examines media coverage of two social protests set more than three decades apart – “The March on the Pentagon” in October 1967, part of the anti-Vietnam war movement and “The Battle for Seattle” in November-December 1999, part of the movement for democratic globalization. Through two separate studies – a content analysis of print media coverage and qualitative in-depth interviews with journalists – this dissertation looks for patterns of sourcing and framing between the coverage of these two protests. It also examines any possible influence on these patterns caused by journalists’ access to diverse sources and research through the …

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