Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Applied sciences (4)
- Deep learning (3)
- Water quality (3)
- Asphalt concrete (2)
- Conductive concrete (2)
-
- Electrically conductive concrete (2)
- Electrochemical precipitation (2)
- Flooding (2)
- Hot mix asphalt (2)
- Impedance spectroscopy (2)
- Lower Rio Grande Valley (2)
- Sensitivity analysis (2)
- Sustainability (2)
- ADCIRC simulations (1)
- ASS 304 (1)
- Alloy (1)
- Autonomous vehicle (1)
- Bacteria (1)
- Bioretention (1)
- Brownsville Ship Channel (1)
- Building codes (1)
- Campus area (1)
- Carbon based fillers (1)
- Cementitious materials (1)
- Certified efficient appliances (1)
- Cohesionless soil (1)
- Compressive behaviors (1)
- Concrete cathode (1)
- Conductive concrete cathode (1)
- Conductive materials (1)
Articles 31 - 44 of 44
Full-Text Articles in Engineering
Hydraulic Characterization Of Porous Media For Remediation Applications In Geo-Environmental Engineering: Laboratory Experiment And Numerical Modeling, Syed Istiyak Ahmed
Hydraulic Characterization Of Porous Media For Remediation Applications In Geo-Environmental Engineering: Laboratory Experiment And Numerical Modeling, Syed Istiyak Ahmed
Theses and Dissertations
Hydraulic properties of porous media are very important characters for various geotechnical and geo-environmental applications. In this study, multi-step outflow experiments and numerical modeling were performed for homogeneous and layered column conditions with fine to coarse sands to investigate water flow mechanisms and better predict water flow and solute transport with the van Genuchten-Mualem (VGM) hydraulic model. Inversed modeling under HYDRUS-1D was performed to estimate six VGM soil hydraulic parameters. Forward modeling was conducted to evaluate the impacts of VGM hydraulic parameters along with saturated hydraulic conductivity to solute transport. Scaling effects such as column length, time, and chemical parameters …
A Meta-Analysis On The Constitutive Behavior Of Engineered Cementitious Composite, Marie Angelica Ventura Vallangca
A Meta-Analysis On The Constitutive Behavior Of Engineered Cementitious Composite, Marie Angelica Ventura Vallangca
Theses and Dissertations
A meta-analysis is conducted for the mechanical properties of an Engineered Cementitious Composite (ECC). ECC is a special type of fiber reinforced cementitious composites that is characterized by high ductility (3-5% strain) with 1.5-2% fiber content by volume. The brittle nature and weak tensile strength of concrete cause various damages such as cracking. ECC has superior cracking resistance considered as a sustainable alternative for construction and repair. Meta-analysis is a statistical method to remove a possible bias of a single set of data. A meta-analysis collects and analyzes a large group of data obtained from multiple investigations of the same …
Lower Rio Grande Valley Tap Water Hardness Removal Using Conductive Concrete Cathode In Electrochemical Precipitation, Mirza Addaito Billah
Lower Rio Grande Valley Tap Water Hardness Removal Using Conductive Concrete Cathode In Electrochemical Precipitation, Mirza Addaito Billah
Theses and Dissertations
Electrochemical water softening has obtained significant attention in recent years due to being environmentally friendly. One of this method's significant problems is the requirement of high cathodic surface area for enough efficiency. As most electrochemical cells use costly metal cathodes with meager service life and low structural integrity, practical large-scale implementation is scarce. In this research, graphite-concrete cathodes were proposed to replace conventional metal cathodes in the electrochemical water softening process. Graphite concrete has been used for heating pavement and electrical conductive roads. In this research concrete mixed with graphite powder by volume was successfully used as a cathode to …
Development Of A Cyberinfrastructure For Assessment Of The Lower Rio Grande Valley North And Central Watersheds Characteristics, Linda Isabel Navarro Navarro
Development Of A Cyberinfrastructure For Assessment Of The Lower Rio Grande Valley North And Central Watersheds Characteristics, Linda Isabel Navarro Navarro
Theses and Dissertations
Due to an increase in urbanization in the Lower Rio Grande Valley (LRGV), there have been substantial modifications to hydrology causing a decline in water quality to the Laguna Madre watershed. The major concern is the inflow of freshwater from the North and Central waterways released to the Lower Laguna Madre which is designated as an impaired watershed for high concentrations of bacteria and low dissolved oxygen. The objective of this study is to perform a watershed characterization to determine potential pollution sources of each watershed by developing a cyberinfrastructure and collect a wide inventory of data. The objective will …
The Optimization Of Efficiency And Infrastructure For Modern Potable Water Treatment Plants, Brent A. Dekock
The Optimization Of Efficiency And Infrastructure For Modern Potable Water Treatment Plants, Brent A. Dekock
Theses and Dissertations
The USDOE Industrial Assessment Centers (IACs) is a program that is designed to help small and medium-sized manufacturing facilities reduce their overall costs and improve energy efficiency. This includes improving potable water treatment plants which supply water throughout the country. This thesis covers the process of how IAC branches and water treatment facilities generally operate, as well as several assessment recommendations that have been developed by a branch of the IAC for several water treatment plants based in the Rio Grande Valley of Texas. The steps of the assessment and water treatment process are described, and several cost saving measures …
Traffic Time Headway Prediction And Analysis: A Deep Learning Approach, Saumik Sakib Bin Masud
Traffic Time Headway Prediction And Analysis: A Deep Learning Approach, Saumik Sakib Bin Masud
Theses and Dissertations
In the modern world of Intelligent Transportation System (ITS), time headway is a key traffic flow parameter affecting ITS operations and planning. Defined as “the time difference between any two successive vehicles when they cross a given point”, time headway is used in various traffic and transportation engineering research domains, such as capacity analysis, safety studies, car-following, and lane-changing behavior modeling, and level of service evaluation describing stochastic features of traffic flow. Advanced travel and headway information can also help road users avoid traffic congestion through dynamic route planning, for instance. Hence, it is crucial to accurately model headway distribution …
A Study On The Triaxial Shear Behavior Of Geosynthetic Reinforced Soil By Discrete Element Method, Md Wasif Zaman
A Study On The Triaxial Shear Behavior Of Geosynthetic Reinforced Soil By Discrete Element Method, Md Wasif Zaman
Theses and Dissertations
A 3D DEM model using Particle Flow Code (PFC3D) software was developed utilizing a bonded-ball flexible membrane approach to study cohesionless soil as a discontinuous discrete material. The 3D model was calibrated and verified with experimental data, and a sensitivity analysis was carried out for the microparameters. Triaxial tests were simulated to observe the stress-strain curves and volumetric changes, as well as the strength parameters of soils consisting of spherical particles with different gradations but the same porosity. One important finding is that the relationships between particle size and deviatoric stress, internal friction angle, and dilatancy angle were found to …
Performance And Efficiency Evaluation Of Stormwater Management Lids Using Pcswmm: Numerical Modeling And Sensitivity Analysis, Abdullah Al Fatta
Performance And Efficiency Evaluation Of Stormwater Management Lids Using Pcswmm: Numerical Modeling And Sensitivity Analysis, Abdullah Al Fatta
Theses and Dissertations
Implementation of Low Impact Development systems (LIDs) can reduce the detrimental effects of urbanization. In this study, performance of both conventional drainage system and bioretention swales LID green infrastructure was assessed. Personal Computer Storm Water Management Model (PCSWMM) was used to investigate the performance by producing runoff hydrographs. Calibration and validation were conducted with independent storm events to minimize the gap between the simulated and observed outflow. Among different sensitive parameters, saturated hydraulic conductivity, suction head, percent initially saturated, Manning’s N for impervious area, were used in calibration. Each storm event resulted coefficient of determination (R2) values of 0.656 or …
An Advanced Approach For Contract Time Determination In Highway Projects, Cuauhtemoc Torres Cantu
An Advanced Approach For Contract Time Determination In Highway Projects, Cuauhtemoc Torres Cantu
Theses and Dissertations
In project management, finishing a project on schedule is one of the most important aspects. The Texas Department of Transportation (TxDOT) has been experiencing delays in some projects that can be accounted to an inaccurate project time estimation process. This research presents the development of a user-friendly and comprehensive computer-based contract time determination system. The enhanced system implements probabilistic scheduling techniques such as Program Evaluation and Review Technique, and Monte Carlo Simulation. Additionally, the application of a lognormal two-point PERT method is explored in this study. The new system proposes the use of a database of production rates based on …
Assessment Of Some Of The Common Practices Used In Scheduling Highway Projects, Jennifer Reyes
Assessment Of Some Of The Common Practices Used In Scheduling Highway Projects, Jennifer Reyes
Theses and Dissertations
There are several factors documented in the literature that can affect the accuracy of estimated project durations in highway construction, such as weather, location, and soil conditions. Recently, the Texas Department of Transportation (TxDOT) raised a concern regarding some of the practices used when estimating the contract time for projects. This research presents an assessment of the effect that two practices identified have on the estimated project duration. These two practices include: 1) the estimated lead/lag times in project schedules and 2) scheduling with only critical or controlling activities. The effect of these practices is measured, primarily, by using four …
Dehumidification Water Quality Analysis Of The South Texas Gulf Of Mexico, Erik Esteban Castillo
Dehumidification Water Quality Analysis Of The South Texas Gulf Of Mexico, Erik Esteban Castillo
Theses and Dissertations
This project is to introduce a new methodology for environmental research that analyzes humidity from a water treatment perspective. This is done by using a household dehumidifier, which extracts the excess humidity in a given space, to harvest the samples. The dehumidifier was used outside to act as an Atmospheric Water Generator (AWG), which is the process of extracting water from the atmosphere. When AWG is placed near shoreline, then it's classified as a Desalinated Atmospheric Water Generator (DAWG) since it extracts distilled seawater water-vapors. The methodology for DAWG analyzed turbidity in the humidity on SPI, indicating to meet {<.15} TCEQ turbidity water quality standard. The turbidity also showed to have an adverse relation to weather conditions. There is an open market in research on this topic, where the methodology for DAWG can offer answers. This project identifies DAWG as being a sustainable source of potable water for a municipality.
An Evaluation Of Wastewater Pumping Station Facilities Using Statistical Techniques In Analyzing Each For Rehabilitation Design And To Improve The Adverse Environmental Affects, Zenaida S. Guerrero
An Evaluation Of Wastewater Pumping Station Facilities Using Statistical Techniques In Analyzing Each For Rehabilitation Design And To Improve The Adverse Environmental Affects, Zenaida S. Guerrero
Theses and Dissertations
The objective of this research project is to develop two evaluation models, one using excel to provide a design criterion for wastewater pumping stations in collecting design parameters and information effecting efficiency and performance of the pumps. Secondly, to develop a linear regression model for these parameters giving a correlation between dependent and independent variables to verify adverse environmental aspects. This study is based in the City of Weslaco, pertaining to the north waste watershed. The parameters collected are age, efficiency, service area, total dynamic head, existing conditions, monthly sanitary sewer over flow work orders, precipitation data, population by service …
Development Of Lower Rio Grande River Water Quality Transportation Numerical Model For Bi-National River Management, Jose O. Gonzalez
Development Of Lower Rio Grande River Water Quality Transportation Numerical Model For Bi-National River Management, Jose O. Gonzalez
Theses and Dissertations
Traditionally, water quality modelling has focused on modelling individual water bodies. However, water quality management problems must be analyzed at the larger scale to include influences from various water bodies that are interconnected. This paper provides a study on the hydrologic and quality transportation calculation by developing a hydrodynamic (unsteady state) channel routing model using a water-balanced approach. A one dimension Lagrangian river model was developed and applied to the 210 plus miles for the lower Rio Grande River Basin from the Falcon Dam to the head water of Brownsville that pours onto the Gulf of Mexico. This model can …
Discrete Element Analysis Of Scb Variability: Asphalt Mixtures, David Saul Renteria
Discrete Element Analysis Of Scb Variability: Asphalt Mixtures, David Saul Renteria
Theses and Dissertations
The Semi-Circular Bending (SCB) test was modeled using the Discrete Element Method (DEM) implemented in numerical software Particle Flow Code (PFC). The fracture analysis of the SCB was studied using two mixtures gradation, Superpave and Coarse Matrix High Binder. The aggregate phase in the model was achieved by using two-dimensional aggregate images with different angularity indexes. The study of the variability of the SCB extends to the random generation of aggregate particles and air voids in the model, in addition to changing the properties at the interface between the aggregate and mastic phases. Results indicate the strong influence of the …