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Articles 1 - 11 of 11
Full-Text Articles in Engineering
Sulfonated Styrene Grafted Sebs/Abs Made By Additive Manufacturing For Ion Exchange Applications, Avianna Elaine Gallegos
Sulfonated Styrene Grafted Sebs/Abs Made By Additive Manufacturing For Ion Exchange Applications, Avianna Elaine Gallegos
Open Access Theses & Dissertations
An interpenetrating polymer network (IPN) for cation exchange applications was synthesized from a blend of styrene-ethylene/butylene-styrene (SEBS) and acrylonitrile butadiene styrene (ABS), which was 3D printed, grafted with crosslinked polystyrene (PS), and sulfonated. A method for styrene grafting was applied to reduce the damage to polymer phases caused by the sulfonation reaction. Styrene and divinylbenzene monomers were introduced to the IPN and induced with heat treatment to polymerize in situ. The graft copolymerization reaction was enhanced with varying quantities of benzoyl peroxide as a chemical initiator. The samples were subsequently sulfonated with chlorosulfonic acid in dichloroethane and functionalized for ion …
Influence Evaluation On Near-Road Concentrations Of Pm2.5 During Covid-19 Pandemic, Marcos Alan Banda Morales
Influence Evaluation On Near-Road Concentrations Of Pm2.5 During Covid-19 Pandemic, Marcos Alan Banda Morales
Open Access Theses & Dissertations
SARS-CoV-2, also known as COVID-19, was discovered in Wuhan, China in late 2019and spread rapidly worldwide in 2020. The COVID-19 pandemic and its quarantine periods influenced the number of people using their vehicles and the number of miles traveled, which correspondingly influenced the air quality of urban areas. The influence of the restrictions caused by the quarantine period on air quality differs from location to location. Previous research accounted for countries, but no research was done at the state level individually. This research attempts to evaluate the transportation-related air quality during the COVID-19 pandemic period using data from the Texas …
Direct Potable Reuse Piloting: Optimizing Chloramination, Operationalizing Ultrafiltration, And Understanding Zero Liquid Discharge Options, Marcela Carolina Herrera
Direct Potable Reuse Piloting: Optimizing Chloramination, Operationalizing Ultrafiltration, And Understanding Zero Liquid Discharge Options, Marcela Carolina Herrera
Open Access Theses & Dissertations
A pilot study was deployed at the John T. Hickerson Water Reclamation facility to analyze the viability of high recovery direct potable water reuse (DPR), aiming for zero liquid discharge (ZLD). This pilot consists of a chloramination system and ultrafiltration (UF) as pretreatment for reserve osmosis (RO) followed by UV-peroxide, granular activated carbon (GAC), and concentrate-enhanced recovery reverse osmosis (CERRO). Stabilizing the chloramination and UF system was the first step to ensure efficiency during the downstream processes. The formation of monochloramine is essential for the mitigation of biofouling of the UF membranes. The formation of monochloramine occurs by specific liquid …
A Case Study In Design, Construction, And Operation Of A Meromictic Solar Pond In Texas, Usa, Bianca Paola Meneses Brassea
A Case Study In Design, Construction, And Operation Of A Meromictic Solar Pond In Texas, Usa, Bianca Paola Meneses Brassea
Open Access Theses & Dissertations
Over the last four decades, meromictic solar ponds have been the subject of limnological studies and engineering research. A case of practical interest is the salinity gradient solar pond (SGSP). SGSP science and technologies have been systemically advanced in El Paso, Texas. This dissertation aims to share lessons learned in designing, constructing, and operating the El Paso Solar Pond, a NaCl-based solar pond that achieved high-temperature performance over two decades, commencing in 1984. Many of the practical lessons learned have not been published and are thus not readily available in archival journals, and this contribution provides a remedy. The value …
Identifying Particulate Matter Spatial Variation In The El Paso Del Norte Region Using Land-Use Regression Modeling And Data Obtained From A Network Of Low-Cost Sensors, Leonardo Demetrio Vazquez-Raygoza
Identifying Particulate Matter Spatial Variation In The El Paso Del Norte Region Using Land-Use Regression Modeling And Data Obtained From A Network Of Low-Cost Sensors, Leonardo Demetrio Vazquez-Raygoza
Open Access Theses & Dissertations
The emergence and rise in popularity of low-cost sensors for atmospheric observation aresetting a new precedent in identifying emission hotspots and providing high-resolution spatial and temporal data. Furthermore, low-cost sensors are becoming popular among institutions and the public, allowing community scientists to become more involved in air quality monitoring. However, concerns about the accuracy and precision of low-cost sensors have been questioned. Most recent research has focused on the utility of real-time monitoring and calibration requirements for these sensors. A low-cost monitoring project has deployed sensors in the El Paso del Norte region in low and high annual average daily …
Continuous Moisture Measurement During Pavement Foundation Construction: Laboratory Measurements, Isaac Esteban Zuniga
Continuous Moisture Measurement During Pavement Foundation Construction: Laboratory Measurements, Isaac Esteban Zuniga
Open Access Theses & Dissertations
Moisture content directly affects all properties of subgrade materials. A rapid, continuous, and accurate technique to determine moisture content during subgrade construction is the next step needed to improve the mechanistic-based quality of pavement foundations. In this study, six geomaterials were compacted to standard/modified proctor specifications and subjected to laboratory measurements to study the variations in their electromagnetic and electric properties with moisture content. The relationships between the seismic modulus, unconfined compressive strength, lightweight deflectometer, and moisture content for the same geomaterials were also established. Large-scale replicate specimens were also compacted and subjected to numerous measurements. The dielectric constant measured …
Development Of Balanced Mix Design Quality Control Specifications Based On The Acceptance Limits Of Hma Performance Tests, Lucas Tameirao Abrantes
Development Of Balanced Mix Design Quality Control Specifications Based On The Acceptance Limits Of Hma Performance Tests, Lucas Tameirao Abrantes
Open Access Theses & Dissertations
With the augmented use of recycled materials, recycling agents, modified binders, andwarm mix asphalt additives, several highway agencies including the Texas Department of Transportation (TxDOT), have considered methods to improve the durability and long-term performance of asphalt concrete (AC) mixes. The need for performance tests that could consistently evaluate the rutting and cracking potentials of AC mixes became crucial as the popularity of the Balanced Mix Design (BMD) concept has increased over the years. A concern now is related to the practicality of these tests for routine use in the process of quality control and quality assurance during the field …
A Comparable Analysis Of Civilian And Military Airfield Runway Design Procedures, Jacob Wessel
A Comparable Analysis Of Civilian And Military Airfield Runway Design Procedures, Jacob Wessel
Open Access Theses & Dissertations
In the United States there are two primary agencies that regulate, approve, and aid in airfield runway designs. These two agencies are the Federal Aviation Administration (FAA) and the Department of Defense (DOD), and they both have different design procedure for design and construction of their prospective airfield runways. It is important to have a closer look at the design procedures, the reliance of software and how these compare to each other. The primary objective of this research was to conduct a sensitivity analysis of the FAA and the DOD airfield design programs used to aid in the design of …
Reconstruction Of As-Built Civil Infrastructure Using Lidar To Support Digital Twin Visualization, Jose Luis Lugo
Reconstruction Of As-Built Civil Infrastructure Using Lidar To Support Digital Twin Visualization, Jose Luis Lugo
Open Access Theses & Dissertations
Digital twin (DT) technology is state-of-the-art for engineering processes using a virtual model of a physical system with near real-time data exchange (either fully or semi-automated) during the process (collection and feedback). The potential of DT for as-built civil infrastructure remains relatively unexplored. To achieve the expectation of a DT, three main capacities must be met: (1) accurate virtual twin of physical asset (2) continuous data acquisition and data management (3) automated or semi-automated decision making from the data exchange. The challenge addressed herein is to determine a feasible approach to create an accurate virtual model (efficiently) from light detection …
Equity Driven Data Analysis For Public Transportation Planning, Gerardo Ivan Valenzuela Mendoza
Equity Driven Data Analysis For Public Transportation Planning, Gerardo Ivan Valenzuela Mendoza
Open Access Theses & Dissertations
Existing public transportation planning methods use a trip-based approach rather than a user-based approach; a user-based approach is sensitive to a broader range of planning strategies and policies, especially those that affect or take into consideration how users spend their time and resources. Even though transportation planning agencies such as Metropolitan Planning Organizations (MPOs) are required to strive for environmental and social justice, there is still a gap that needs to be filled. Urban population growth and urbanization with its impact on public planning require continuous research to address the constantly evolving challenges when it comes to transportation. As cities …
Improving Efficiency At El Paso Water Canal Plant, Angel Bustamante
Improving Efficiency At El Paso Water Canal Plant, Angel Bustamante
Open Access Theses & Dissertations
AbstractThis project focused on the savings associated with filter backwash and rewash water at the Canal plant. Canal plant is a conventional surface water plant owned and operated by El Paso Water. Approximately 330,000 gallons of backwash water and 84,500 gallons of rewash water are lost daily during normal operational conditions. The combined 414,500 gallons of water are equivalent to 1.27 acre feet per day. During a full eight-month surface water season, this is 305 acre feet. With the goal of optimizing the plant, residuals waste streams can be recycled to the head of the treatment plant. However, there is …