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Potential Water Treatment Residual Used For Eutrophication Prevention: Varying Bake Time And Wet-Dry Release Experiments, Noor Fahoum 2022 The University of Akron

Potential Water Treatment Residual Used For Eutrophication Prevention: Varying Bake Time And Wet-Dry Release Experiments, Noor Fahoum

Williams Honors College, Honors Research Projects

A challenge faced today in water ways is the excessive growth of algae due to eutrophication. These harmful algal blooms create problems for the environment and safety concerns for the use of water for drinking purposes. An increase in limiting nutrients such as nitrogen and phosphorus are one of the factors that contribute to eutrophication. This is a concern for the Akron Water Treatment plant where preventative measures are being taken to avoid the potential formation of harmful algal blooms and the cyanotoxins they may release in the water. Through various studies, water treatment residuals (WTR) have been found to ...


Quantifying Discharge On The Lower Mississippi River Physical Model, Taylor S. Cagle 2021 Louisiana State University and Agricultural and Mechanical College

Quantifying Discharge On The Lower Mississippi River Physical Model, Taylor S. Cagle

LSU Master's Theses

The Lower Mississippi River Physical Model (LMRPM) is a distorted, movable-bed physical model that replicates the hydraulics and bedload (sand) transport of the lower 195 miles of the Mississippi River. One year of flow and sediment transport on the prototype can be modeled in approximately one hour. With the ability to simulate long periods of time on the Lower Mississippi River in such a short time frame, the model can provide unique insight into subjects such as the potential effects from relative sea level rise on the lower river’s hydraulics and sediment transport. Quantifying discharge on the LMRPM is ...


Risk And Safety Associated With Hazardous Materials Transport In Rural And Native American Communities: A Case Study Of Thurston County, Nebraska, Sydney James 2021 University of Nebraska-Lincoln

Risk And Safety Associated With Hazardous Materials Transport In Rural And Native American Communities: A Case Study Of Thurston County, Nebraska, Sydney James

Civil and Environmental Engineering Theses, Dissertations, and Student Research

Rural counties and Native American Reservations often lack the resources and planning to respond to a hazardous material release which can cause catastrophic results. Many rural counties and Native American Reservations do not have close access to a fire department or medical facility, which would increase response times during a time of crisis. Jurisdiction issues further complicate the matter since Native American Reservations are sovereign nations,.

Thurston County, home to two Native American Reservations, served as a case study to perform a safety analysis for vehicles transporting hazardous material. Stakeholders within the county from tribal, county, and state levels were ...


Going Green: A Comparative Analysis Of Green Urbanism In Paris And Shanghai, Jeanne Torp 2021 University of Mississippi

Going Green: A Comparative Analysis Of Green Urbanism In Paris And Shanghai, Jeanne Torp

Honors Theses

As climate change becomes more pressing with each day and as we scramble to slow down the challenges it poses, adapting the means of operation within our cities will become an invaluable tool for reducing humanity’s carbon footprint. This paper seeks to study the ways in which green infrastructure in global cities can be used to do just that—adapting to and mitigating the effects of challenges resulting from climate change. In order to provide a broad overview of the effectiveness of such green infrastructure systems across the globe, this research will focus on two cities that vary greatly ...


Flow Visualization Study Of Wake-Stabilized Diffusion Flames In A Crossflow: Effects Of Crossflow Turbulence, Diya Cui 2021 The University of Western Ontario

Flow Visualization Study Of Wake-Stabilized Diffusion Flames In A Crossflow: Effects Of Crossflow Turbulence, Diya Cui

Electronic Thesis and Dissertation Repository

Effects of crosswind turbulence on the mechanisms and flow structures affecting emissions from non-premixed wake stabilized flames from elevated stacks are investigated. In the current work, two conditions of upstream crossflow are tested to investigate the effects of turbulence on the flame, including the turbulent flow with enhanced freestream turbulence that is generated by a passive grid placed upstream of the burner, and smooth flow with ambient turbulence for baseline comparisons. The experimental method of Mie scattering flow visualization is used to investigate the effects of turbulence. The addition of freestream turbulence has been found to make changes to the ...


Evaluation Of Permanent Concrete Barriers To Mash 2016, Samuel Elias Hovde 2021 University of Nebraska - Lincoln

Evaluation Of Permanent Concrete Barriers To Mash 2016, Samuel Elias Hovde

Civil and Environmental Engineering Theses, Dissertations, and Student Research

The objective of this research project was to develop evaluation criteria for permanent concrete barriers to MASH 2016 TL-3 and TL-4 without crash testing and then to evaluate permanent concrete barrier standards provided by the sponsoring agencies of the Midwest Pooled Fund Program. A literature review was conducted to determine evaluation criteria for stability, shape, strength, and anchorage, and a database of permanent concrete barrier crash tests was compiled. A survey was conducted to collect barrier standards from the members of the Midwest Pooled Fund Program, and barriers were selected and evaluated according to the determined methodology. A total of ...


The Role Of Rejuvenators In Embedded Damage Healing For Asphalt Pavement, Shi Xu, Xueyan Liu, Amir Tabakovic, P Lin, Y Zhang, S Nahar, B J. Lommerts, Erik Schlangen 2021 Delft University of Technology

The Role Of Rejuvenators In Embedded Damage Healing For Asphalt Pavement, Shi Xu, Xueyan Liu, Amir Tabakovic, P Lin, Y Zhang, S Nahar, B J. Lommerts, Erik Schlangen

Articles

Rejuvenator encapsulation technique showed great potential for extrinsic asphalt pavement damage healing. Once the capsules are embedded within asphalt pavement, the healing is activated on-demand via progressing microcrack. When the microcrack encounters the capsule, the fracture energy at the tip opens the capsule and releases the rejuvenator. Then the released rejuvenator wets the crack surfaces, diffuses into and softens the aged bitumen, allowing two broken edges to come in the contact, preventing further asphalt pavement deterioration. The quality and speed of the damage repair process strongly depend on the quality of rejuvenator, thus it is important to choose a proper ...


Impact Of Particle Surface Charge Heterogeneity On Deposition Onto Flat Surfaces And Transport In Porous Media, Thompson Delon 2021 University of Nebraska-Lincoln

Impact Of Particle Surface Charge Heterogeneity On Deposition Onto Flat Surfaces And Transport In Porous Media, Thompson Delon

Civil and Environmental Engineering Theses, Dissertations, and Student Research

Biological and non-biological natural colloids are anisotropic and ubiquitously exist in groundwater. Previously in colloid transport modelling, colloids are assumed to be homogenous for simplification, whether in shape or surface charge. More research has been done to incorporate surface heterogeneity in the transport experiment, i.e., surface charge heterogeneity on collector in column experiment. However, few studies have been done on surface heterogeneity on colloids themselves.

In this dissertation, Janus particles with different surface charge was developed to model surface heterogeneity on colloids. The interaction energy between Janus particle and flat surfaces was analyzed through DLVO simulation. It was discovered ...


Past The Tipping Point, But With Hope Of Return: How Creating A Geoengineering Compulsory Licensing Scheme Can Incentivize Innovation, Brooke Wilson 2021 Washington and Lee University School of Law

Past The Tipping Point, But With Hope Of Return: How Creating A Geoengineering Compulsory Licensing Scheme Can Incentivize Innovation, Brooke Wilson

Washington and Lee Journal of Civil Rights and Social Justice

This Note explores the patenting of geoengineering technologies and issues arising from the early stages of this high-risk, high-reward technology. This Note focuses on one possible solution to solving the issues surrounding the patenting of geoengineering technology: Creating a specialized compulsory licensing scheme.


Stream Power Analysis Of The Mid-Barataria Conveyance Channel Model, Jack Graham 2021 Louisiana State University

Stream Power Analysis Of The Mid-Barataria Conveyance Channel Model, Jack Graham

LSU Master's Theses

Louisiana’s coast is disappearing at an alarming rate. Erosion, subsidence, sea level rise, and the devastating impacts from hurricanes have contributed to the loss of thousands of square miles of land that was once a thriving ecosystem. The Louisiana government is taking action to help protect and restore these coastal habitats, which are a home to some two million people and numerous species of animals, birds, and fish. The Mid-Barataria Sediment Diversion is a new type of project to help create land in Barataria Basin. Conceptually, the diversion is designed to use the available sediment and stream power provided ...


Utilizing Digital Image Processing And Two‑Source Energy Balance Model For The Estimation Of Evapotranspiration Of Dry Edible Beans In Western Nebraska, Wei‑zhen Liang, Isabella Possignolo, Xin Qiao, Kendall DeJonge, Suat Irkmak, Derek M. Heeren, Daran Rudnick 2021 University of Nebraska-Lincoln

Utilizing Digital Image Processing And Two‑Source Energy Balance Model For The Estimation Of Evapotranspiration Of Dry Edible Beans In Western Nebraska, Wei‑Zhen Liang, Isabella Possignolo, Xin Qiao, Kendall Dejonge, Suat Irkmak, Derek M. Heeren, Daran Rudnick

Biological Systems Engineering: Papers and Publications

Having an accurate yet simple method to estimate crop evapotranspiration ( ETC) is a vital component of reliable irrigation scheduling. In this study, two versions of the two-source energy balance (TSEB) model: the TSEB model with the Priestley–Taylor equation (TSEB-PT) and the Penman–Monteith equation (TSEB-PM), were used to estimate ETC of dry edible beans in western Nebraska. Compared with previous studies, this study is unique in that a Visual Basic software—Crop Canopy Image Analyzer (CCIA) was developed to process digitally captured RGB canopy images to obtain necessary canopy cover (CC) parameters for the TSEB models such ...


The Role Of Glaciers In Hydropower Production In Nepal, Shakti P.C., Ishwar Pun, Rocky Talchabhadel, Darshan Kshetri 2021 National Research Institute for Earth Science and Disaster Resilience (NIED), Tsukuba, Japan

The Role Of Glaciers In Hydropower Production In Nepal, Shakti P.C., Ishwar Pun, Rocky Talchabhadel, Darshan Kshetri

Journal of Asian Energy Studies

Nepal is a mountainous country rich in water resources, with huge potential for hydropower generation. The Department of Electricity Development (DoED), which sits within the Nepalese Ministry of Energy, has published Guidelines for Study of Hydropower Projects to set out the official standards for the detailed study of hydropower projects in Nepal. The guide is regularly revised, with the latest revision having taken place in 2018, in order to ensure the long-term sustainability of the projects. Among the key issues considered are the linkages between glaciers and hydropower projects in Nepal under a changing environment. The formation of new glacial ...


Experimental Study Of Tornado-Induced Pressures, Aya Kassab 2021 The University of Western Ontario

Experimental Study Of Tornado-Induced Pressures, Aya Kassab

Electronic Thesis and Dissertation Repository

The increased devastation associated with tornadic flow-fields in terms of human lives or destruction of properties and their subsequent economic losses highlights the significance of understanding the tornado vortex structure, particularly near the ground where the majority of this destruction happens. While the body of research in this area is increasing there is a lack of resolution associated with physical near-surface measurements in tornado-like vortices (TLVs) and the effects of translation, surface roughness, and surface vortex dynamics are not yet well understood.

In order to address these gaps, high spatial and temporal surface pressure measurements were carried out at WindEEE ...


New Experimental Methods For Modelling Canopy Problems, Marilena Enus 2021 The University of Western Ontario

New Experimental Methods For Modelling Canopy Problems, Marilena Enus

Electronic Thesis and Dissertation Repository

The challenge in large scale experimental fluid dynamics comes from the demand to develop simple methods that can measure and model movement of flexible objects and wind flow over large three-dimensional volumes with readily available equipment. Representing and modelling the flow around trees is challenging mainly because of the complexity and variability of trees. In this research different methods were tested in the novel Wind Engineering Energy and Environment (WindEEE) Dome facility at Western University, Canada to capture displacements of a moving single tree and flow velocities over a model forest edge in a three-dimensional form. The tested measuring methods ...


Construction And Materials Best Practice For Concrete Sidewalks, Sergio F. Brena, Kara Peterman, Rhyan Sullivan 2021 University of Massachusetts Amherst

Construction And Materials Best Practice For Concrete Sidewalks, Sergio F. Brena, Kara Peterman, Rhyan Sullivan

Structural Engineering and Mechanics Research Reports

This report summarizes an 18-month effort to investigate best practices to incorporate into the materials and construction of concrete sidewalks to mitigate surface scaling damage induced by freeze-thaw cycles in the presence of deicing chemicals. The study involved an in-situ experimental study accompanied by laboratory testing and quantitative analyses to determine key factors that impact sidewalk performance and durability. The primary variables considered in the study were concrete mixture design (aggregate/paste optimization, air content, and cementitious material replacements), workmanship (delivery, placement, finishing, curing), and deicing treatment. The collective effort involved participants from construction companies, a concrete producer, academia, testing ...


Estimating A Range Of Flow Rates Resulting From Extreme Storm Events Within The Wekiva River Watershed Through Statistical Testing And Modeling, Wesley K. Koning 2021 University of North Florida

Estimating A Range Of Flow Rates Resulting From Extreme Storm Events Within The Wekiva River Watershed Through Statistical Testing And Modeling, Wesley K. Koning

UNF Graduate Theses and Dissertations

The middle portion of the St. Johns River is located in East-Central Florida, USA. This region of the St. Johns River is increasingly subject to urbanization and conversion of forest areas to agricultural land. Overall, these changes mean that future flood events in the area could adversely impact local citizens. Therefore, the examination of extreme flood events and resiliency to such events is critical. The purpose of this preliminary study is to explore a range of practical applications to estimate extreme flood flows at watercourses within the Middle St. Johns River Basin, focusing specifically upon the Wekiva River sub-basin. The ...


Quantification Of Nitric Oxide Concentration Using Single-Walled Carbon Nanotube Sensors, Jakob Meier, Joseph Stapleton, Eric M. Hofferber, Abigail Haworth, Stephen D. Kachman, Nicole M. Iverson 2021 University of Nebraska - Lincoln

Quantification Of Nitric Oxide Concentration Using Single-Walled Carbon Nanotube Sensors, Jakob Meier, Joseph Stapleton, Eric M. Hofferber, Abigail Haworth, Stephen D. Kachman, Nicole M. Iverson

Biological Systems Engineering: Papers and Publications

Nitric oxide (NO), a free radical present in biological systems, can have many detrimental effects on the body, from inflammation to cancer. Due to NO’s short half-life, detection and quan- tification is difficult. The inability to quantify NO has hindered researchers’ understanding of its impact in healthy and diseased conditions. Single-walled carbon nanotubes (SWNTs), when wrapped in a specific single-stranded DNA chain, becomes selective to NO, creating a fluorescence sensor. Unfortunately, the correlation between NO concentration and the SWNT’s fluorescence intensity has been difficult to determine due to an inability to immobilize the sensor without altering its properties ...


Modeling And Prioritizing Interventions Using Pollution Hotspots For Reducing Nutrients, Atrazine And E. Coli Concentrations In A Watershed, Olufemi P. Abimbola, Aaron R. Mittelstet, Tiffany Messer, Elaine Berry, Anna van Griensven 2021 University of Nebraska - Lincoln

Modeling And Prioritizing Interventions Using Pollution Hotspots For Reducing Nutrients, Atrazine And E. Coli Concentrations In A Watershed, Olufemi P. Abimbola, Aaron R. Mittelstet, Tiffany Messer, Elaine Berry, Anna Van Griensven

Biological Systems Engineering: Papers and Publications

Excess nutrients and herbicides remain two major causes of waterbody impairment globally. In an attempt to better understand pollutant sources in the Big Sandy Creek Watershed (BSCW) and the prospects for successful remediation, a program was initiated to assist agricultural producers with the implementation of best management practices (BMPs). The objectives were to (1) simulate BMPs within hotspots to determine reductions in pollutant loads and (2) to determine if water-quality standards are met at the watershed outlet. Regression-based load estimator (LOADEST) was used for determining sediment, nutrient and atrazine loads, while artificial neural networks (ANN) were used for determining E ...


Technology And Technical Device Used In The Efficient Use Of Water Resources In Irrigated Agriculture, А.U. Аtajanov 2020 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers

Technology And Technical Device Used In The Efficient Use Of Water Resources In Irrigated Agriculture, А.U. Аtajanov

Irrigation and Melioration

The economical use of water resources, the improvement and development of new technology and technical means for its implementation, ensuring the saving of irrigation water is one of the most important issues of today. This article is devoted to the issues of improving the technology of irrigation of furrows and the creation of technical means,also recommended technology and using from created technical device in selected per experiment fields and analyzing their results.


Empirical Assessment Of Climate Change Impacts On Agriculture In Samarkand Region, Sh.B. Babakholov 2020 Tashkent State Agrarian University

Empirical Assessment Of Climate Change Impacts On Agriculture In Samarkand Region, Sh.B. Babakholov

Irrigation and Melioration

Agricultural production is highly sensitive to climate factors like other endogenous factors, and the expected climate change projections may have a negative impact on the efficiency and income of agricultural producers. Therefore, this study aims to analyze the impact of changes in climatic factors (average air temperature and precipitation) on the technical efficiency of cotton growing farmers as its determinants in Samarkand region. Empirical analyzes were performed on the cases of 1141 cotton-growing farms using panel-based Time-Invariant Inefficiency model. According to the results of the analysis, cotton farms in the region have an average technical efficiency of 76%, which in ...


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