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Full-Text Articles in Engineering

A Thermo-Poromechanics Finite Element Model For Predicting Arterial Tissue Fusion, Douglas P. Fankell Aug 2018

A Thermo-Poromechanics Finite Element Model For Predicting Arterial Tissue Fusion, Douglas P. Fankell

Mechanical Engineering Graduate Theses & Dissertations

This work provides modeling efforts and supplemental experimental work performed towards the ultimate goal of modeling heat transfer, mass transfer, and deformation occurring in biological tissue, in particular during arterial fusion and cutting. Developing accurate models of these processes accomplishes two goals. First, accurate models would enable engineers to design devices to be safer and less expensive. Second, the mechanisms behind tissue fusion and cutting are widely unknown; models with the ability to accurately predict physical phenomena occurring in the tissue will allow for insight into the underlying mechanisms of the processes. This work presents three aims and the efforts ...


Assessing A Low-Cost Methane Sensor Quantification System For Use In Complex Rural And Urban Environments, Ashley Monika Collier-Oxandale, Joanna Gordon Casey, Ricardo Antonio Piedrahita, John Ortega, Hannah Halliday, Jill Johnston, Michael Hannigan Jun 2018

Assessing A Low-Cost Methane Sensor Quantification System For Use In Complex Rural And Urban Environments, Ashley Monika Collier-Oxandale, Joanna Gordon Casey, Ricardo Antonio Piedrahita, John Ortega, Hannah Halliday, Jill Johnston, Michael Hannigan

University Libraries Open Access Fund Supported Publications

Low-cost sensors have the potential to facilitate the exploration of air quality issues on new temporal and spatial scales. Here we evaluate a low-cost sensor quantification system for methane through its use in two different deployments. The first was a 1-month deployment along the Colorado Front Range and included sites near active oil and gas operations in the Denver-Julesburg basin. The second deployment was in an urban Los Angeles neighborhood, subject to complex mixtures of air pollution sources including oil operations. Given its role as a potent greenhouse gas, new low-cost methods for detecting and monitoring methane may aid in ...


Environmental And Reinforcement Effects On Concrete Expansion Undergoing Accelerated Alkali-Silica Reaction, David Graff Jun 2018

Environmental And Reinforcement Effects On Concrete Expansion Undergoing Accelerated Alkali-Silica Reaction, David Graff

Civil Engineering Graduate Theses & Dissertations

This thesis is a part of ongoing research investigating the effects of alkali-silica reactions (ASR) on concrete’s mechanical properties. Over 50 concrete specimens have been cast and cured to encourage ASR development to the point of damage in less than a year. Specimens include 42”×30”×10” shear specimens, 14”×14”×14” blocks, 6”×6”×14” prisms, 4”×4”×16” prisms, cylinders, and wedge splitting test specimens. Some samples are stored in a fog room with conditions of 100oF, and 95% relative humidity and wrapped in burlap wetted or submerged in 1.0M sodium hydroxide (NaOH). Other specimens are ...


Archaeology And Conservation Of The Middle Phrygian Gate Complex At Gordion, Turkey, Semih Gönen, Richard F. Liebhart, Naomi F. Miller, Elspeth Dusinberre May 2018

Archaeology And Conservation Of The Middle Phrygian Gate Complex At Gordion, Turkey, Semih Gönen, Richard F. Liebhart, Naomi F. Miller, Elspeth Dusinberre

Classics Faculty Contributions

In 2016, a project was undertaken at Gordion, Turkey, to stabilize and conserve the remains of a rubble platform built early in the Middle Phrygian period (ca. 800–700 b.c.e.) under the vast Gate Complex leading to the megarons on the Citadel Mound. In the process, aspects of Middle Phrygian building strategies came to light that enhanced our understanding gained from the original excavation in the 1950s. This article outlines the archaeology of the Middle Phrygian Gate Complex and the sophisticated internal structures that lent stability to the rubble platform upon which it was built, and examines the ...


Seasonal Variability Of Airborne Particulate Matter And Bacterial Concentrations In Colorado Homes, Nicholas Clements, Patricia Keady, Joanne B. Emerson, Noah Fierer, Shelly L. Miller Apr 2018

Seasonal Variability Of Airborne Particulate Matter And Bacterial Concentrations In Colorado Homes, Nicholas Clements, Patricia Keady, Joanne B. Emerson, Noah Fierer, Shelly L. Miller

University Libraries Open Access Fund Supported Publications

Aerosol measurements were collected at fifteen homes over the course of one year in Colorado (USA) to understand the temporal variability of indoor air particulate matter and bacterial concentrations and their relationship with home characteristics, inhabitant activities, and outdoor air particulate matter (PM). Indoor and outdoor PM2.5 concentrations averaged ( st. dev.) 8.1 +/- 8.1 ug/m3 and 6.8 +/- 4.5 ug/m3, respectively. Indoor PM2.5 was statistically significantly higher during summer compared to spring and winter; outdoor PM2.5 was significantly higher for summer compared to spring and fall. The PM2.5 I/O ratio was ...


Overcoming Limitations In Semiconductor Alloy Design, Theresa M. Christian Feb 2018

Overcoming Limitations In Semiconductor Alloy Design, Theresa M. Christian

Physics Graduate Theses & Dissertations

Inorganic semiconductors provide an astonishingly versatile, robust, and efficient platform for optoelectronic energy conversion devices. However, conventional alloys and growth regimes face materials challenges that restrict the full potential of these devices. Novel alloy designs based on isoelectronic co-doping, metamorphic growth and controllable atomic ordering offer new pathways to practical and ultra-high-efficiency optoelectronic devices including solar cells and light-emitting diodes.

Abnormal isoelectronic alloys of GaP1-xBix, GaP1-x-yBixNy, and GaAs1-xBix with unprecedented bismuth incorporation fractions and crystalline quality are explored in this thesis research. Comparative studies of several GaP1-xBi ...


Thermal Fusion For Sutureless Closure: Devices, Composition, Methods, Eric Anthony Kramer Jan 2018

Thermal Fusion For Sutureless Closure: Devices, Composition, Methods, Eric Anthony Kramer

Mechanical Engineering Graduate Theses & Dissertations

As minimally invasive surgical techniques progress, the demand for reliable ligation is pronounced. The surgical advantages of energy-based vessel sealing exceed those of traditional, compression-based ligatures in procedures sensitive to duration, foreign bodies, and recovery time alike. While the use of energy-based devices to seal or transect vasculature and connective tissue bundles is widespread, the breadth of heating strategies and energy dosimetry used between devices underscores an uncertainty as to the molecular nature of the sealing mechanism and induced tissue bond. Further, energy-based techniques (e.g., tissue “fusion” or tissue “welding”) exhibit promise for the closure, repair and functional recovery ...


Arm-First Synthesis Of Star Polymers With Wedge Polymer Arms Using Ring-Opening Metathesis Polymerization And Bifunctional Crosslinkers, Robert Whitson Learsch Jan 2018

Arm-First Synthesis Of Star Polymers With Wedge Polymer Arms Using Ring-Opening Metathesis Polymerization And Bifunctional Crosslinkers, Robert Whitson Learsch

Materials Science & Engineering Graduate Theses & Dissertations

Recently, wedge polymers with high molecular weight, size, and rigidity have been designed and synthesized. To date, the complexity of wedge polymers has been limited to the diblock copolymer architecture. This work presents a two-step, one-pot process to make star polymers with wedge polymer arms. After the wedge polymer arms are synthesized, crosslinker species are added to the reaction, rapidly forming star polymers. Crosslinker species with different conformational freedom were designed and synthesized and their performance was evaluated. Mass conversion up to 92% and stars with up to 17 arms were synthesized with the most rigid crosslinker. The effects of ...


Influence Of Ground Densification With Drainage Control On The Performance Of Structures On Liquefiable Ground, Juan Carlos Olarte Jan 2018

Influence Of Ground Densification With Drainage Control On The Performance Of Structures On Liquefiable Ground, Juan Carlos Olarte

Civil Engineering Graduate Theses & Dissertations

Significant progress has been made in recent years toward a better understanding of liquefaction and its consequences on structures. Several techniques have been developed to reduce the liquefaction hazard. Among these techniques, densification is the most popular in practice, sometimes combined with a form of drainage control. Yet, the influence of ground densification with or without drainage control on the performance of structures and the key mechanisms of soil-structure interaction remains poorly understood.

In this study, centrifuge experiments were designed and conducted at the University of Colorado Boulder’s 400 g-ton centrifuge facility to evaluate soil-foundation-structure interaction (SFSI) effects, considering ...


Model Identification And Control Of Autonomous Ground Vehicles, Sina Aghli Jan 2018

Model Identification And Control Of Autonomous Ground Vehicles, Sina Aghli

Computer Science Graduate Theses & Dissertations

Autonomous Ground Vehicles (AGV) are mobile robotic platforms used in variety of applications to execute tasks which could be dangerous for humans to operate. Recently, autonomous cars are discussed in carrying passengers from point to point without human interaction. Sophisticated controllers are required to operate autonomous vehicles while responding to both normal and hazardous driving conditions. Dangerous conditions which might be easily perceivable by sensors in the system require controllers that can readily benefit from the new sensory information. In this thesis, we address this problem by asserting that the design of controllers and corresponding calibration and local planning methods ...


Automated Laser Frequency Re-Stabilization, Denton Wu Jan 2018

Automated Laser Frequency Re-Stabilization, Denton Wu

Undergraduate Honors Theses

Atomic physics research has emerged as an exciting field with its promise of yielding advancements in our computing and measurement capabilities that could transform technologies down to the consumer level. An indispensable tool for this research is the laser, which allows for the precise control of atoms. Lasers need to be stable in an atomic physics experiment for their light to be useful, and to that end, laser stabilization techniques have become an important practice in the lab. These techniques are not perfect however, and they can ``drop'' the stability lock on their lasers when shocked by strong mechanical noise ...


Modeling Hypertrophic Cardiomyopathy In Neonatal Cardiomyocytes In Cultured In 3d, Esther Choi Jan 2018

Modeling Hypertrophic Cardiomyopathy In Neonatal Cardiomyocytes In Cultured In 3d, Esther Choi

Undergraduate Honors Theses

Heart disease continues to be the leading cause of death in both men and women. It is accompanied with cellular- and organ- level remodeling that cannot be mimicked or recaptured by cells on standard culture platforms. Polyethylene glycol hydrogels bridge this gap by providing user-defined tunability for cell culture. A novel 3D cell culture system was developed to encapsulate neonatal rat ventricular cardiomyocytes (NRVMs) in a single plane, and cell health was assessed. In parallel, recombinant adenoviruses containing the mutations responsible for human hypertrophic cardiomyopathy (HCM) in the beta myosin gene (R403Q and R453C) were generated and used as a ...


Walking The High Ground: The Manned Orbiting Laboratory And The Age Of The Air Force Astronauts, Will Holsclaw Jan 2018

Walking The High Ground: The Manned Orbiting Laboratory And The Age Of The Air Force Astronauts, Will Holsclaw

Undergraduate Honors Theses

This thesis is an examination of the U.S. Air Force’s cancelled – and heretofore substantially classified – Manned Orbiting Laboratory (MOL) space program of the 1960s, situating it in the broader context of military and civilian space policy from the dawn of the Space Age in the 1950s to the aftermath of the Space Shuttle Challenger disaster. Several hundred documents related to the MOL have recently been declassified by the National Reconnaissance Office, and these permit historians a better understanding of the origins of the program and its impact. By studying this new windfall of primary source material and linking ...


Skeletal Muscle Metabolism: From Tissue To Stem Cell, Katherine Elise Gadek Jan 2018

Skeletal Muscle Metabolism: From Tissue To Stem Cell, Katherine Elise Gadek

Molecular, Cellular, and Developmental Biology Graduate Theses & Dissertations

Excessive circulating triglycerides due to reduction or loss of lipoprotein lipase (LPL) activity contribute to hypertriglyceridemia and increased risk for pancreatitis. The only gene therapy treatment for LPL deficiency decreases pancreatitis but minimally reduces hypertriglyceridemia. Synthesized in striated muscle and adipose tissue, LPL is then trafficked to blood vessel endothelial cells where it hydrolyzes triglycerides into free fatty acids. We conditionally knocked out LPL in differentiated striated muscle tissue lowering striated muscle LPL activity and causing hypertriglyceridemia. We crossed these LPL knockout mice with mice possessing a conditional avian retroviral receptor gene and infected mice with human LPL or mCherry ...


Approximate Bayesian Computation For Parameter Estimation In Complex Thermal-Fluid Systems, Jason D. Christopher Jan 2018

Approximate Bayesian Computation For Parameter Estimation In Complex Thermal-Fluid Systems, Jason D. Christopher

Mechanical Engineering Graduate Theses & Dissertations

A major challenge in computational fluid dynamics (CFD) simulations of real-world flows is the accurate assignment of boundary, initial, and geometric conditions, as well as fluid and material properties. Despite advances in experimental techniques, however, acquiring the information necessary to simultaneously set each of these conditions and properties remains a considerable challenge. As a potential solution to this difficulty, recent advances in data-driven parameter estimation techniques have provided flexible and increasingly sophisticated methods for improving the fidelity of simulation configurations using experimental data. This dissertation applies, for the first time, a technique called approximate Bayesian computation (ABC) to complex thermal-fluid ...


Fish-Scales: The Next Step In Soft Body Protection?, Zachary Windsor White Jan 2018

Fish-Scales: The Next Step In Soft Body Protection?, Zachary Windsor White

Mechanical Engineering Graduate Theses & Dissertations

Balancing protection with mobility is a tradeoff all levels of the food chain have made in evolutionary development. The ability to withstand threats allows for longer life, as long as it does not degrade the ability to hunt and evade. The same can be said for modern engineered protection. Analogies can be drawn between common forms of man-made personal protection and the soft-body protecting structures seen in nature. However, nature has figured out how to balance encumberment with protection through the evolution of compound armors in a way that humans have yet to do in a relevant way. Fish-skin presents ...


Bio-Inspired Robotics Based On Liquid Crystalline Elastomers(Lces) And Flexible Stimulators, Qingyang Sun Jan 2018

Bio-Inspired Robotics Based On Liquid Crystalline Elastomers(Lces) And Flexible Stimulators, Qingyang Sun

Mechanical Engineering Graduate Theses & Dissertations

Soft robotics are most inspired from animals harnessing soft structures to move on ground or even harsh topological surface. Soft materials are the primary composition of soft robotics. Although they are not as durable and strong as ceramics and metals, soft materials stand out for their reversibility of deformation, response to stimuli and bio-compatibility. In this dissertation, liquid crystalline elastomer(LCE) combined with patterned flexible electronics and liquid metal have been used as soft robotics that simulating different kinds of worm-like movement. Besides, the impressive bendability of LCE finds itself a lot of potential in nature-camouflage area.

First of all ...


The Impacts Of Cooking And An Assessment Of Indoor Air Quality In Colorado Passive And Tightly Constructed Homes, Ryan Edward Militello-Hourigan Jan 2018

The Impacts Of Cooking And An Assessment Of Indoor Air Quality In Colorado Passive And Tightly Constructed Homes, Ryan Edward Militello-Hourigan

Mechanical Engineering Graduate Theses & Dissertations

Low-energy home design is becoming more common in new and retrofitted homes, and energy-efficient designs often sell at a premium [1]. This perceived and realized value of reducing energy use in homes is important as the need to reduce fossil fuel use becomes increasingly critical. Energy efficiency measures, like tightening the envelope of a home saves energy, but can impact the indoor air quality. We monitored the indoor air quality of nine tightly constructed homes, one tightly constructed public library, and one conventionally constructed home, and performed a repeatable cooking activity to observe the impact and response to the resulting ...


Large Eddy Simulations Of Industrial Burners, Siddharth Prashant Nigam Jan 2018

Large Eddy Simulations Of Industrial Burners, Siddharth Prashant Nigam

Mechanical Engineering Graduate Theses & Dissertations

During the past four years, a gift from 3M has funded a project that is at the intersection of academia and industry at the University of Colorado, Boulder (CU). The overall objective of this joint computational and experimental effort is to explore optimization and improvement of burner/chilled-roll systems for polymer film flame treatments. Using the computational and experimental tools developed in this project, existing treatment processes will be improved and new avenues of technology innovation will be explored.

In this thesis, industry-relevant heat treatment processes with catalytic and ribbon burners are studied using large eddy simulations (LES). The simulations ...


High-Fidelity Simulation Of Small-Body Lander/Rover Spacecraft, Stefaan Van Wal Jan 2018

High-Fidelity Simulation Of Small-Body Lander/Rover Spacecraft, Stefaan Van Wal

Aerospace Engineering Sciences Graduate Theses & Dissertations

The scientific return of spacecraft missions that explore solar system small bodies can be increased through the inclusion of surface exploration with deployed probes. In this dissertation, a methodology is presented that allows for fast, parallel simulation of bouncing trajectories of arbitrary-shaped ballistic probes in the small-body environment. This enables planning of probe deployment and operation, and supports their inclusion on future missions.

The coarse small-body shape is modeled using an implicit signed distance field (SDF) that allows for fast collision detection. Statistical features are included onto the SDF using procedural generation techniques. The small-body gravity field is captured using ...


Propagation And Control Of Geometric Variation In Engineering Structural Design And Analysis, Joseph David Benzaken Jan 2018

Propagation And Control Of Geometric Variation In Engineering Structural Design And Analysis, Joseph David Benzaken

Applied Mathematics Graduate Theses & Dissertations

In this dissertation, we present a methodology for understanding the propagation and control of geometric variation in engineering design and analysis. This work is comprised of two major components: (i) novel discretizations and associated solution strategies for rapid numerical solution over geometric parametrizations of the linear and nonlinear thin-shell equations, and (ii) efficient surrogate modeling techniques and algorithms towards the control of geometric variation. While the methodologies presented are in the setting of structural mechanics, particularly Nitsche's method in the context of linearized membranes, Kirchhoff-Love plates, and Kirchhoff-Love shells, they are applicable to any system of parametric partial differential ...


Designing Materials For Inorganic And Living Photocatalytic Systems For Air, Water, And Co2 Reduction From Sunlight, Yuchen Ding Jan 2018

Designing Materials For Inorganic And Living Photocatalytic Systems For Air, Water, And Co2 Reduction From Sunlight, Yuchen Ding

Chemistry & Biochemistry Graduate Theses & Dissertations

Several strategies are currently being investigated for conversion of incident sunlight into chemical fuels, with readily available chemical feedstocks like air, water, and carbon-dioxide. This thesis focuses on research approach on designing high-efficiency and high-selective photocatalytic materials, ranging from inexpensive and stable inorganic photocatalysts to living nano-biohybrid organisms to achieve solar energy conversion.

This thesis is divided into multiple sections based on the materials and concepts in designing high-efficient and high-selective solar fuel generator. After a brief introduction of photocatalysis in Chapter 1, we describe a novel electrochemical anodization technique for making a wide-variety of doped metal-oxide nanotubes. Using optoelectronic ...


Triazole-Based Polymers Via Photo-Initiated Copper-Catalyzed Azide-Alkyne Cycloaddition, Han Byul Song Jan 2018

Triazole-Based Polymers Via Photo-Initiated Copper-Catalyzed Azide-Alkyne Cycloaddition, Han Byul Song

Chemical & Biological Engineering Graduate Theses & Dissertations

Conventional thermosetting photopolymers are ubiquitous in a wide array of industrial applications such as UV coatings and adhesives, 3D printed objects, and dental composites, and these reactions are largely based on acrylate or methacrylate chain-growth free radical photopolymerizations. Despite the significant demand for (meth-) acrylate-based thermosets, problematic characteristics that are inherent in the nature of this polymerization still persist especially in bioapplications. For instance, incomplete conversion of monomers upon early gelation and vitrification in heterogenous networks containing hydrolytically labile ester functionalities, considerable shrinkage stress developed during polymerization, and brittleness of these highly crosslinked (meth-) acrylate-based polymers hinder both the biological ...


Dynamic Hydrogels To Investigate Cell-Matrix Interactions, Tobin Elliott Brown Jan 2018

Dynamic Hydrogels To Investigate Cell-Matrix Interactions, Tobin Elliott Brown

Chemical & Biological Engineering Graduate Theses & Dissertations

Mammalian cells reside in contact with an extracellular matrix (ECM) with which they are inextricably linked. Native ECMs are instructive, and cells are able to sense the mechanical and chemical landscape through a variety of mechanisms. The ECM is also a dynamic microenvironment: changes in composition and structure occur throughout development and during disease progression and wound healing. Hydrogels, water swollen polymer networks, can be used as synthetic mimics of the ECM. The goal of this thesis is to design hydrogels with dynamic properties and to use these as platforms to study the effect of these properties on cellular behavior ...


Engineering Bacterial Gene Expression: Applications Towards Biofuels And Antibiotic Resistance, Peter Britton Otoupal Jan 2018

Engineering Bacterial Gene Expression: Applications Towards Biofuels And Antibiotic Resistance, Peter Britton Otoupal

Chemical & Biological Engineering Graduate Theses & Dissertations

Nature is rarely static. Organisms live in diverse and stressful environments that necessitate rapid response strategies for survival. Microorganisms have responded to this by evolving bet-hedging, wherein they exhibit constitutively heterogeneous gene expression to maximize fitness across numerous background. The goal of this thesis is to “hijack” this phenomenon using novel gene expression engineering techniques to alter how bacteria respond to their environments, in order to address pressing societal concerns.

This begins with a systematic exploration of how bacterial gene expression naturally responds to antibiotics and biofuels. This reveals promising gene candidates for targeted manipulation, for which a library of ...


The Role Of Protein-Protein Interactions In Inducing Interfacial Aggregation, Lea Line Gisele Sorret Jan 2018

The Role Of Protein-Protein Interactions In Inducing Interfacial Aggregation, Lea Line Gisele Sorret

Chemical & Biological Engineering Graduate Theses & Dissertations

The synergic exposure to silicone oil-water interfaces and to agitation has been shown to promote the aggregation of therapeutic proteins. Silicone oil is typically used as a lubricant for manufacturing surfaces and pharmaceutical containers such as glass prefilled syringes. This is a problem as protein aggregates formed at the silicone oil-water interface may shed into bulk solutions, leading to product recalls or adverse immunogenicity upon injections into patients.

Protein aggregation in solution occurs as a result of attractive protein-protein interactions (PPI). PPI can be characterized using techniques such as dynamic light scattering which measures the dependence of molecular diffusivity on ...


Heat Transfer In Wall-Bounded Gas-Solids Flows, Aaron Michael Lattanzi Jan 2018

Heat Transfer In Wall-Bounded Gas-Solids Flows, Aaron Michael Lattanzi

Chemical & Biological Engineering Graduate Theses & Dissertations

Despite the remarkable advancements made by modern science, multi-scale problems still pose a significant challenge to the fields of engineering and mathematics. The transport phenomena occurring within a gas-solids flow is a quintessential multi-scale problem. Specifically, the physics occurring at the sub-particle scale is strongly coupled to the macroscopic behavior of many flowing particles. In addition to a fundamental significance, the mathematical desciption of a particle-laden flow is crucial to the efficient design and operation of many industrial systems. Products from multiphase unit operations encompass (but are not limited to): petroleum, pharmaceuticals, polymers, limestone, and energy. In recent years, solid ...


Development Of A Chemical Separation Framework For Effects-Directed Analysis Of Water And Wastewater, Sesha Sai Susheera Pochiraju Jan 2018

Development Of A Chemical Separation Framework For Effects-Directed Analysis Of Water And Wastewater, Sesha Sai Susheera Pochiraju

Civil Engineering Graduate Theses & Dissertations

Environmental water mixtures have become challengingly complex to analyze for toxicological compounds and emerging contaminants. To enhance water characterization, this study focused on developing a framework based on effects-directed analysis (EDA) coupled with chemical separation and qualitative analysis. Six estrogenic compounds, Ethylparaben (EPB), Bisphenol A, 17β-estradiol (E2), 2,4,6-trichlorobiphenyl (TCBP), Octylphenol (OP) and Bis-(2-ethylhexyl)-phthalate (DEHP), were chosen to create a synthetic water mixture that was used to develop and test a separation framework consisting of two-steps: liquid-liquid extraction (LLE) followed by solid phase extraction (SPE). Based on the polarity of these compounds and their adsorption onto the ...


Removal Of Effluent Organic Matter From Secondary Wastewater Effluent Using Granular Activated Carbon, Sierra Rose Johnson Jan 2018

Removal Of Effluent Organic Matter From Secondary Wastewater Effluent Using Granular Activated Carbon, Sierra Rose Johnson

Civil Engineering Graduate Theses & Dissertations

As potable water reuse becomes more common, advanced wastewater treatment trains using granular activated carbon (GAC) may become more prevalent. Twenty-one rapid small-scale column tests (RSSCTs) were used to systematically evaluate GAC performance for a variety of secondary wastewater effluents at three different pretreatment levels; untreated, biofiltered, and ozonated-biofiltered. Total organic carbon (TOC) breakthrough was measured for all waters and pretreatments and compared to a predictive model developed for drinking water. The non-adsorbable and the strongly adsorbing fractions of organic matter were higher than predicted by a drinking water-based model and overall organic matter in wastewater behaved slightly differently in ...


Probabilistic Assessment Of The Benefits Of Retrofitting Nonductile Concrete Buildings In Terms Of Regional Losses, Samantha Michelle Grey Jan 2018

Probabilistic Assessment Of The Benefits Of Retrofitting Nonductile Concrete Buildings In Terms Of Regional Losses, Samantha Michelle Grey

Civil Engineering Graduate Theses & Dissertations

Los Angeles, California, is a densely populated city located in an area of high seismic hazard. The region’s aging building stock has contributed to concerns about the seismic resilience of the community. Recent research has highlighted the vulnerability of nonductile concrete buildings and their associated risk to safety and post-disaster recovery. Currently, there are approximately 1500 nonductile concrete buildings in the city of Los Angeles, motivating discussions for retrofit policies to mitigate the risk stemming from these buildings. While the understanding of individual building retrofit is important for the building owner, investor, and/or tenants, the evaluation of structural ...