Implementation Of Secondary And Tertiary Treated Wastewater In Concrete Manufacturing,
2022
The British University in Egypt
Implementation Of Secondary And Tertiary Treated Wastewater In Concrete Manufacturing, Amany G. Micheal Prof., Haidy Abd El Salm, Gouda Ghanem Prof.
Centre for Advanced Materials
Water scarcity is a problem that faces many regions. In a developing and arid country like Egypt, the need for freshwater is exponentially increasing. This research is an evaluation of the recycled wastewater to be used in concrete manufacturing. The treated wastewater is blended with potable water with percentages of 25%, 50%, and 100%. The mixture of the two types of water is used in concrete mixing and curing. Control specimens with pure potable water are cast for comparison. The setting time for Ordinary Portland Cement is tested using the different water mixes. The hardened concrete is tested in compression …
Groundwater Level Modeling With Machine Learning: A Systematic Review And Meta-Analysis,
2022
Boise State University
Groundwater Level Modeling With Machine Learning: A Systematic Review And Meta-Analysis, Mojtaba Sadegh
Civil Engineering Faculty Publications and Presentations
Groundwater is a vital source of freshwater, supporting the livelihood of over two billion people worldwide. The quantitative assessment of groundwater resources is critical for sustainable management of this strained resource, particularly as climate warming, population growth, and socioeconomic development further press the water resources. Rapid growth in the availability of a plethora of in-situ and remotely sensed data alongside advancements in data-driven methods and machine learning offer immense opportunities for an improved assessment of groundwater resources at the local to global levels. This systematic review documents the advancements in this field and evaluates the accuracy of various models, following …
Copulas For Hydroclimatic Analysis: A Practice-Oriented Overview,
2022
Uppsala University
Copulas For Hydroclimatic Analysis: A Practice-Oriented Overview, Faranak Tootoonchi, Mojtaba Sadegh, Jan Olaf Haerter, Olle Räty, Thomas Grabs, Claudia Teutschbein
Civil Engineering Faculty Publications and Presentations
A warming climate is associated with increasing hydroclimatic extremes, which are often interconnected through complex processes, prompting their concurrence and/or succession, and causing compound extreme events. It is critical to analyze the risks of compound events, given their disproportionately high adverse impacts. To account for the variability in two or more hydroclimatic variables (e.g., temperature and precipitation) and their dependence, a rising number of publications focuses on multivariate analysis, among which the notion of copula-based probability distribution has attracted tremendous interest. Copula is a mathematical function that expresses the joint cumulative probability distribution of multiple variables. Our focus is to …
Modeling Multimodal Access To Primary Care In An Urban Environment,
2022
Marquette University
Modeling Multimodal Access To Primary Care In An Urban Environment, Danielle Eden Del Conte, Amanda Locascio, Joseph Amoruso, Margaret L. Mcnamara
Civil and Environmental Engineering Faculty Research and Publications
Access to primary health care facilities is a key component of public health, and measuring that access is vital to understanding how to target interventions. Transportation is one dimension of access and measuring distance via multiple modes allows better understanding of how varied populations access health care, particularly those who do not have access to a personal vehicle. This work builds on the 2-Step Floating Catchment Area (2SFCA) method to include travel by car, bus, bicycle, and walking. Travel time data are sourced from OpenStreetMap and transit data incorporates stop and schedule information from the General Transit Feed Specification (GTFS). …
Investigating The Relationship Of Preventive And Corrective Maintenance In Chiller Assets Using Linear Regression Analysis,
2022
Air Force Institute of Technology
Investigating The Relationship Of Preventive And Corrective Maintenance In Chiller Assets Using Linear Regression Analysis, Jacob A. Franke
Theses and Dissertations
Asset managers must balance maintenance plans between preventive (PM) and corrective maintenance (CM). While PM plans have been a staple for decades, the benefits achieved have not been thoroughly examined at the asset specific level. This study focuses on the U.S. Air Force chiller portfolio to better understand the relationship between PM and CM, utilizing multiple stages of linear regression modeling and data from 14 US Air Force installations. PM and CM were found to be positively correlated, with PM accounting for relatively small portions of the variance experienced in CM. This study reveals the value of standardized data collection …
A Scientometric Analysis Of Smart Sensors In Facility Management And Applications In Air Force Operations,
2022
Air Force Institute of Technology
A Scientometric Analysis Of Smart Sensors In Facility Management And Applications In Air Force Operations, Joseph-Thomas H. Lehotsky
Theses and Dissertations
To investigate the areas which smart sensors can be implemented to assist facility managers to optimize limited resources, this research consists of a scientometric analysis to identify the areas of research quantitatively and qualitatively. Existing literature related to smart sensors in facility management operations were compiled and trends were analyzed to determine the ways in which researchers have been applying this technology. The title, abstracts, and keyword were used to perform frequency, networking, and clustering analysis. This research effort serves to provide ways in which Air Force installations can implement smart sensors in a way which fulfills the initiatives posed …
Developing An Adaptable Best Value Contractor Selection Tool For Federal Construction Projects,
2022
Air Force Institute of Technology
Developing An Adaptable Best Value Contractor Selection Tool For Federal Construction Projects, Robert B. Kitson
Theses and Dissertations
Currently, there is no Air Force-wide best practice or standard for using an other-than lowest price source selection process for construction projects. Installations often award contracts using Lowest Price Technically Acceptable (LPTA) because of perceived cost and time savings. However, a heavy reliance on LPTA often leads to long-term decreases in quality and value. To allow the Air Force to receive the best value for its construction funding, a simple and adaptable tool was developed that allows installations to pursue contractor selection for construction projects by other-than lowest price methods. This research conducted a systematic literature review to obtain a …
A Post-Disaster Construction Portfolio Optimization Framework For Tyndall Afb Rebuild Post Hurricane Michael,
2022
Air Force Institute of Technology
A Post-Disaster Construction Portfolio Optimization Framework For Tyndall Afb Rebuild Post Hurricane Michael, Andre J. May
Theses and Dissertations
Natural disasters such as hurricanes, earthquakes, tsunamis, and extreme flooding cause severe social and economic disruptions. Restoration of social and revenue-generating services often requires extensive reconstruction, from the facility to the campus scale. For multi-facility portfolios, decision-makers must prioritize post-disaster reconstruction activities appropriately to ensure facilities and infrastructure are restored. In addition, any expansion or new construction initiatives are ideally completed in order of decision-maker and community preference. Most post-disaster optimization and decision framework research consider a single stakeholder as guiding decisions related to a project portfolio. However, these portfolio prioritization frameworks ignore the effect of multiple stakeholders and competing …
A Critical Review Of Climate Change On Coastal Infrastructure Systems,
2022
Air Force Institute of Technology
A Critical Review Of Climate Change On Coastal Infrastructure Systems, Gregory J. Howland Jr.
Theses and Dissertations
This thesis is a response to climate threats identified by DoD report on Climate Change in 2019. A critical review of climate change literature related to coastal infrastructure was conducted to synthesize past research and to inform future research. This review intends to inform how climate change may impact infrastructure systems, how those impacts are evaluated, can the investigation be improved, and what can stakeholders learn from the outcomes. The end goal is to find climate change mitigation strategies and adaptation measures, or identify the easiest path to get to that end. The compiled information will inform civilian and military …
Defining Resilience, Robustness, And Vulnerability Metrics To Guide Facilities And Infrastructure Decision Making For The United States Air Force,
2022
Air Force Institute of Technology
Defining Resilience, Robustness, And Vulnerability Metrics To Guide Facilities And Infrastructure Decision Making For The United States Air Force, Kelly W. Minor
Theses and Dissertations
Tyndall AFB was nearly destroyed after a category five hurricane named Michael tore through the Florida panhandle in 2018. A Program Management Office was stood up to coordinate, plan, and carry out the rebuild efforts of Tyndall AFB. The office’s primary responsibility is “building a base capable of supporting a 21st-century mission while also focusing on structural resiliency and efficiency” (Laidlaw 2019). Despite the requirement to build a resilient infrastructure portfolio, the United States Air Force has yet to fully quantify and qualify measures of resilience, including robustness and vulnerability, in the context of their current built infrastructure portfolio. This …
Application Of Machine Learning Models With Numerical Simulations Of An Experimental Microwave Induced Plasma Gasification Reactor,
2022
Air Force Institute of Technology
Application Of Machine Learning Models With Numerical Simulations Of An Experimental Microwave Induced Plasma Gasification Reactor, Owen D. Sedej
Theses and Dissertations
This thesis aims to contribute to the future development of this technology by providing an in-depth literature review of how this technology physically operates and can be numerically modeled. Additionally, this thesis reviews literature of machine learning models that have been applied to gasification to make accurate predictions regarding the system. Finally, this thesis provides a framework of how to numerically model an experimental plasma gasification reactor in order to inform a variety of machine learning models.
Infrastructure Decision-Making Under Climate Change Uncertainty: Case Study Of Centralized Heating At Wright-Patterson Afb, Ohio,
2022
Air Force Institute of Technology
Infrastructure Decision-Making Under Climate Change Uncertainty: Case Study Of Centralized Heating At Wright-Patterson Afb, Ohio, Tyler A. Ferry, Justin D. Delorit, Christopher M. Chini
Faculty Publications
Increased prevalence, lower cost, and reduced environmental impacts have granted natural gas status as a bridge fuel over the past decade in place of coal-fired heat and power generation across the United States. As a result, some coal facilities are retrofitting their systems to combust natural gas for heating and power. However, data and economic criteria surrounding these decisions are not widely available. Wright-Patterson Air Force Base (WPAFB) invested approximately $25 million, from 2014 to 2016, to retrofit two coal-fired steam-heat-generating plants with natural gas equipment. Economic analyses used to inform these long-term infrastructure decisions rarely consider the uncertainty of …
Development Of Intensity-Duration-Frequency (Idf) Models For Manually Operated Rain Gauge Catchment: A Case Study Of Port Harcourt Metropolis Using 50 Years Rainfall Data,
2022
Department of Civil Engineering, Federal University Otuoke, Nigeria
Development Of Intensity-Duration-Frequency (Idf) Models For Manually Operated Rain Gauge Catchment: A Case Study Of Port Harcourt Metropolis Using 50 Years Rainfall Data, Francis Ogbozige
Tanzania Journal of Engineering and Technology (TJET)
Hydraulic structures such as surface drainages and culverts are usually constructed in urban areas with the intention of draining runoff into nearby streams and rivers in order to avoid flooding. However, most of these structures frequently fail to serve the intended use due to the occurrence of high intensity rainfall accompanied with long duration, which produce runoff discharge higher than their designed capacities. This is common in many developing countries as drainages and culverts are most times constructed without considering hydrological analysis of the catchment. Hence, this research considered Port Harcourt city as a case study by utilizing 50 years …
Chlorine Taste Threshold And Acceptability As A Water Disinfectant Among Indigenous Ngäbe And Non-Indigenous In Rural Panama,
2022
University of South Florida
Chlorine Taste Threshold And Acceptability As A Water Disinfectant Among Indigenous Ngäbe And Non-Indigenous In Rural Panama, Ashley Osler
USF Tampa Graduate Theses and Dissertations
More than two billion people globally still lack access to safely managed drinking water (WHO & UNICEF, 2021). Although gains in access to water service over the past two decades have been large, universal access to safe and affordable drinking water (SDG 6, target 6.1) is not on track to be achieved. In Panama, safely managed drinking water access has not been measured. However, the data on basic water access illustrates the large disparities between rural and urban areas of Panama. While 98% of urban Panamanian households have basic access to water, only 86% of rural Panamanian households, and 54% …
Efficacy Of Softener For Enhancing Fatigue And Low-Temperature Performance Of Asphalt Binders With High Rap,
2022
Arkansas State University
Efficacy Of Softener For Enhancing Fatigue And Low-Temperature Performance Of Asphalt Binders With High Rap, Sumon Roy
Student Theses and Dissertations
The use of a higher percentage of reclaimed asphalt pavement (RAP) in asphalt concrete can lead to developing premature failure of asphalt pavements due to fatigue and/or low-temperature cracking. The incorporation of softening agents in asphalt binders can resolve these problems and enhance pavement durability. This study aims to evaluate the effectiveness of waste-based softening agents for enhancing the properties of asphalt mixes with high RAP contents. Waste cooking oil (WCO), and engine bottom oil (EBO) along with a commercial rejuvenator were investigated in this study. Three types of Performance Grade (PG) binders, each collected from two different sources, used …
Predicting Seismic Site Coefficients For Northeast Arkansas (Nea) By Performing Site Specific Ground Motion Response Analysis (Ssgmra),
2022
Arkansas State University
Predicting Seismic Site Coefficients For Northeast Arkansas (Nea) By Performing Site Specific Ground Motion Response Analysis (Ssgmra), Md Radiue Islam
Student Theses and Dissertations
Northeast Arkansas (NEA) has a deep deposition of soil overlying the bedrock. The code-based design approach e.g., the American Association of State Highway and Transportation Officials (AASHTO) does not account for deep deposition of soil overlying the bedrock. As a result, structures with short-period spectral accelerations are overdesigned at significant cost, and structures with long-period spectral accelerations are under-designed at significant risk. The purpose of this study is to perform SSGMRA for areas in NEA and predict seismic site factors. Seismic hazard analyses have been carried out, and one dimensional (1D) site response analysis has been performed for seven different …
Influence Of Supplementary Cementitious Material (Scm) On Concrete Durability (Drying Shrinkage And Alkali-Silica Reactivity),
2022
Arkansas State University
Influence Of Supplementary Cementitious Material (Scm) On Concrete Durability (Drying Shrinkage And Alkali-Silica Reactivity), Raiyan Chowdhury
Student Theses and Dissertations
This study investigates the long-term durability of concrete by replacing cement (10%, 20%, and 30%) with four potential Supplementary Cementitious Material (SCMs), namely, Reclaimed Fly Ash (RFA), Ground Bottom Ash (GBA), Class F Fly Ash (FA), and Metakaolin® (MK). For long-term durability, drying shrinkage and alkali-silica reactivity (ASR) tests were performed along with workability (slump) and compressive strength tests. The FA and RFA demonstrated better workability compared to GBA, MK, and combined mixes (RFA-MK or GBA-MK). The GBA and RFA modified specimens exhibited better compressive strength than other SCMs. Modifying concrete mix with SCMs lowered the ASR expansion than the …
Increasing Heat-Stress Inequality In A Warming Climate,
2022
McGill University
Increasing Heat-Stress Inequality In A Warming Climate, Mohammad Reza Alizadeh, John T. Abatzoglou, Jan F. Adamowski, Jeffrey P. Prestemon, Bhaskar Chittoori, Ata Akbari Asanjan, Mojtaba Sadegh
Civil Engineering Faculty Publications and Presentations
Adaptation is key to minimizing heatwaves' societal burden; however, our understanding of adaptation capacity across the socioeconomic spectrum is incomplete. We demonstrate that observed heatwave trends in the past four decades were most pronounced in the lowest-quartile income region of the world resulting in >40% higher exposure from 2010 to 2019 compared to the highest-quartile income region. Lower-income regions have reduced adaptative capacity to warming, which compounds the impacts of higher heatwave exposure. We also show that individual contiguous heatwaves engulfed up to 2.5-fold larger areas in the recent decade (2010–2019) as compared to the 1980s. Widespread heatwaves can overwhelm …
Evaluation Of Gev Over Lp3 When Predicting Return Period Annual Exceedance For Santa Ana, San Gabriel And Urbanized Regions In California,
2022
Loyola Marymount University
Evaluation Of Gev Over Lp3 When Predicting Return Period Annual Exceedance For Santa Ana, San Gabriel And Urbanized Regions In California, Maria Beatriz De Paula Macedo
LMU Theses and Dissertations
The objective of this present thesis was to determine whether GEV (Generalized Extreme Value) itself can be a more conservative distribution than LP3 (Log Pearson III) associated with other methods, such as the B17B weighting procedure with Single Grubbs-Beck (SGB) for low outliers, when determining the projected floods in a flood frequency analysis (FFA) for Santa Ana and San Gabriel regions and other urbanized stream gages present in California. In this work, USGS PeakFQ was utilized. From the results obtained, it was possible to state that GEV fitting results were directly affected by the length of the data. When the …
Glycerol-Driven Denitratation: Process Kinetics, Microbial Ecology, And Operational Controls,
2022
Columbia University
Glycerol-Driven Denitratation: Process Kinetics, Microbial Ecology, And Operational Controls, Matthew Baideme, Chenghua Long, Luke Plante, Jeffrey A. Starke, Michael A. Butkus, Katrik Chandran
Civil and Environmental Engineering Faculty Research and Publications
Denitratation, the selective reduction of nitrate to nitrite, is a novel process and when coupled with anaerobic ammonium oxidation (anammox) could achieve resource-efficient biological nitrogen removal of ammonium- and nitrate-laden waste streams. Using a fundamentally-based, first principles approach, this study optimized a stoichiometrically-limited, glycerol-driven denitratation process and characterized mechanisms supporting nitrite accumulation with results that aligned with expectations. At the optimal influent chemical oxygen demand to nitrate ratio of 3.0 : 1 identified, glycerol supported selective nitrate reduction to nitrite (nitrite accumulation ratio, NAR = 62%) and near-complete nitrate conversion (nitrate reduction ratio, NRR = 96%), indicating its viability in …
