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Investigation Of Membrane Fouling And Cleaning In Direct Contact Membrane Distillation Of Municipal Wastewater, Michelle Miller
Investigation Of Membrane Fouling And Cleaning In Direct Contact Membrane Distillation Of Municipal Wastewater, Michelle Miller
Civil Engineering ETDs
Municipal wastewater discharge to the environment is generally subject to regulations established under the Clean Water Act. Though the water is highly treated it is not suitable for human consumption. Increased interest in water reuse for potable supply introduces concern about trace constituents present in their water, such as pharmaceuticals and endocrine disruptors. Current treatment processes, such as reverse osmosis, are used to remove many of these compounds, but is expensive and energy intensive. The rise of interest in potable water reuse may cause consumers to be concerned about trace constituents present in their water and would require additional treatment. …
Structural Influences On Intensity Interferometry Correlation, Mark Harris
Structural Influences On Intensity Interferometry Correlation, Mark Harris
Civil Engineering ETDs
Pairing the information received from multiple telescopes to explore the universe is typically based on the interference phenomenon between amplitudes of light, rather their intensities. Brighter sources and larger telescopes allow for greater amounts of light to be collected, but do not specifically involve the intensity interference of electromagnetic fields. There is an alternate form of creating images of distant objects called Intensity Interferometry (II), which is less sensitive to atmospheric distortions and aberrations of telescope surfaces. The deficiencies of II are overcome as photo detectors become more sensitive and computers more powerful. In recognition of this possibility this dissertation …
Thermal Fatigue Damage Of Asphalt Pavement, Md Islam
Thermal Fatigue Damage Of Asphalt Pavement, Md Islam
Civil Engineering ETDs
Fatigue damage can be defined by a decrease in stiffness of Asphalt Concrete (AC) under repeated traffic loading. For each cycle of traffic loading, tensile strain develops at the bottom of AC layer of an asphalt pavement. Some localized damages occur in the material at minute-scale due to this developed tensile strain. These damages cause decrease in stiffness (E) of AC. Damage caused by a single vehicle is small. However the accumulated damage is not small if a large number of vehicles are considered over the design life of an asphalt pavement. After certain level of damage accumulation, bottom-up fatigue …
Examination Of Silica Removal With Solids Recycle For Reverse Osmosis Pretreatment, Magdalena Sims
Examination Of Silica Removal With Solids Recycle For Reverse Osmosis Pretreatment, Magdalena Sims
Civil Engineering ETDs
Water treatment methods serve to remove harmful constituents from ground and surface waters prior to municipal distribution by exploiting the physical and chemical properties of those constituents. Properties can include size, charge, or solubility. Silica (SiO2) is difficult to remove during water treatment because it can exist in ground and surface waters as various dissolved and particulate species, all of which are defined by different properties. Silica speciation is dependent on variables like pH, temperature, concentration, and ionic composition. Consumption of silica as it exists in drinking water is not dangerous to humans or animals, but it can form damaging …
Modified Inverse First-Order Reliability Method (I-Form) For Predicting Extreme Sea States, Aubrey Celia Eckert-Gallup
Modified Inverse First-Order Reliability Method (I-Form) For Predicting Extreme Sea States, Aubrey Celia Eckert-Gallup
Civil Engineering ETDs
Environmental contours describing extreme sea states are generated as the input for numerical or physical model simulations as a part of the standard current practice for designing marine structures to survive extreme sea states. Such environmental contours are characterized by combinations of significant wave height (Hs) and energy period (Te) or peak period (Tp) values calculated for a given recurrence interval using a set of data based on hindcast simulations or buoy observations over a sufficient period of record. The use of the inverse first-order reliability method (I-FORM) is standard design practice for generating environmental contours. This thesis develops enhanced …
Wellbore Microannulus Characterization And Seal Repair: Computational And Lab Scale Modeling, Steven Gomez
Wellbore Microannulus Characterization And Seal Repair: Computational And Lab Scale Modeling, Steven Gomez
Civil Engineering ETDs
Subsurface geologic formations used for extracting resources such as oil and gas can subsequently be used as a storage reservoir for the common greenhouse gas CO2, a concept known as Carbon Capture and Storage (CCS). Pre-existing wellbores penetrate the reservoirs where supercritical CO2 is to be injected. These wellbores can potentially be a pathway for contamination if CO2 leaks through wellbore flaws to an overlying aquifer or the atmosphere. Characterizing wellbore integrity and providing zonal isolation by repairing these wellbore flaws is of critical importance to the long-term isolation of CO2 and success of CCS. This research aims to characterize …
Risk-Based Decision Making Model For The Selection Of Flood Mitigation Alternatives, Natalia M. Sanabria Andino
Risk-Based Decision Making Model For The Selection Of Flood Mitigation Alternatives, Natalia M. Sanabria Andino
Civil Engineering ETDs
In recent years, there has been a noticeable increase in the frequency of natural disasters such as wildfires, hurricanes and flooding, resulting in big economic, environmental, and social impacts. In the case of flood events, impacts such as community anxiety, loss of life, water pollution, and contamination of agricultural land have been found to be equally, if not more important, than the economic impacts of such events. Nevertheless, the literature shows that flood risk assessment studies incorporating economic, environmental, and societal impacts are limited. In addition, flood mitigation measures are typically compared focusing on economic criteria and not considering stakeholders …
Characterization Of Urban Storm Runoff By Monitoring Sediments And Riparian Vegetation, Adrienne Martinez
Characterization Of Urban Storm Runoff By Monitoring Sediments And Riparian Vegetation, Adrienne Martinez
Civil Engineering ETDs
Difficulties associated with monitoring urban stormwater quality present considerable challenges to stormwater managers in the arid southwest. Complexities arise from the infrequent occurrence of storm events, their highly localized extent, and the short duration of storm hydrographs. The presence of sediment in high amount can make both sample collection challenging and the interpretation of the resulting data difficult. This study explored an alternative strategy in which sediments and plant matter from within the channels in an urban watershed in the Northeast Heights of Albuquerque, New Mexico, were collected for analysis of metals from possible sources within the watershed. The upper …
High Shear Strain Characterization Of Plain Weave Fiber Reinforced Lamina, Michael Peterson
High Shear Strain Characterization Of Plain Weave Fiber Reinforced Lamina, Michael Peterson
Civil Engineering ETDs
Strain energy driven deployable structures have recently become of high interest to the deployable space structures community. Made out of thin composite sections, these structures possess increased stiffness and stabilization while reducing payload masses significantly. The added capability of self-deploying provides additional benefit in reducing structural complexity due to traditional mechanical systems typically required to deploy. One challenge to using such a structure is the high deployment accelerations that could potentially cause damage to the onboard payload if not managed properly. A solution to damp these deployments, while not sacrificing the performance benefits gained, is highly sought after within the …
Toward Improved Evaluation Of Large Scale Hydrologic Models: Estimation And Quantification Of Parameter Uncertainty, Lijuan Jia
Civil Engineering ETDs
With the development of increasingly complex hydrologic models that use a wide range of parameters to represent hydrologic processes both in space and time, many challenges arise with respect to simulation and quantification of uncertainty. The goal of this research is to introduce strategies to effectively and efficiently estimate and quantify hydrologic responses. A robust framework for parameter estimation and uncertainty quantification is proposed. The procedure also considers temporal variations over a time-series. Specifically, two issues of traditional estimation schemes and uncertainty quantification methods were addressed: overparameterization and reduction of parameter uncertainty through quantitative information. Parameters were categorized as distributed, …