A Safety And Emissions Analysis Of Continuous Flow Intersections, 2018 University of Massachusetts Amherst
A Safety And Emissions Analysis Of Continuous Flow Intersections, Joshua Wolfgram
Environmental & Water Resources Engineering Masters Projects
Increasing travel demand, and challenges associated with high percentages of leftturning vehicles, have encouraged the introduction of significant infrastructure advancements. Certain alternative intersection designs, such as continuous flow intersections, median U-turns, and jughandles, eliminate the traditional protected lefterations of these intersection types have been studied to varying degrees, their safety and emissions-related impacts are not well-understood. This project develops a series of microsimulation models for two continuous flow intersections (CFI) located in Missouri and Colorado, and uses the Surrogate Safety Assessment Model (SSAM) to determine the impact of those designs on the location and type of conflicts compared to conventional ...
Evaluation Of The Role Of Driver’S Knowledge Of Who Has The Right-Of-Way Contributes To Interstate On-Ramp Crashes, Deogratias Eustace, Vamsi Krishna Indupuru
The knowledge of drivers on who has the right-of-way between the one on mainline lanes of a freeway and the one entering the freeway through on-ramp junction lane was evaluated. In addition, drivers’ opinions on how to make the on-ramp junctions safer were collected. A survey instrument with 21 items requesting drivers’ information in regard with demographics, freeway driving experience, knowledge of right-of-way and merging practices was used for data collection. The results show that crashes are relatively rare events and for some reasons, most of them never happen but result into near misses, which can not be reported and ...
Re-Entrained Road Dust Pm10 Emission From Selected Streets Of Krakow And Its Impact On Air Quality, 2018 AGH University o Science and Technology
Re-Entrained Road Dust Pm10 Emission From Selected Streets Of Krakow And Its Impact On Air Quality, Marek Bogacki, Marian Mazur, Robert Oleniacz, Mateusz Rzeszutek, Adriana Szulecka
Efficacy Of Nh3 As A Secondary Barrier Treatment For Inactivation Of Salmonella Typhimurium And Methicillin-Resistant Staphylococcus Aureus In Digestate Of Animal Carcasses: Proof-Of-Concept, 2018 Iowa State University
Efficacy Of Nh3 As A Secondary Barrier Treatment For Inactivation Of Salmonella Typhimurium And Methicillin-Resistant Staphylococcus Aureus In Digestate Of Animal Carcasses: Proof-Of-Concept, Jacek A. Koziel, Timothy S. Frana, Heekwon Ahn, Thomas D. Glanville, Lam T. Nguyen, J. (Hans) Van Leeuwen
Jacek A. Koziel
Managing the disposal of infectious animal carcasses from routine and catastrophic disease outbreaks is a global concern. Recent research suggests that burial in lined and aerated trenches provides the rapid pathogen containment provided by burial, while reducing air and water pollution potential and the length of time that land is taken out of agricultural production. Survival of pathogens in the digestate remains a concern, however. A potential answer is a ‘dual’-barrier approach in which ammonia is used as a secondary barrier treatment to reduce the risk of pathogen contamination when trench liners ultimately leak. Results of this study showed ...
Call For Abstracts - Resrb 2018, June 18-20, Brussels, Belgium, 2017 Wojciech Budzianowski Consulting Services
Call For Abstracts - Resrb 2018, June 18-20, Brussels, Belgium, Wojciech M. Budzianowski
No abstract provided.
Registration Form Resrb 2018, 2017 Wojciech Budzianowski Consulting Services
Registration Form Resrb 2018, Wojciech M. Budzianowski
No abstract provided.
Abstract Template Resrb 2018, 2017 Wojciech Budzianowski Consulting Services
Abstract Template Resrb 2018, Wojciech M. Budzianowski
No abstract provided.
Moving Bed Biofilm Reactors: Evaluation Of Geometry, Attachment Surface Material And Biofilm Populations On The Uptake Of Ammonia And Synthetic Organic Contaminants In Wastewater., 2017 University of New Mexico
Moving Bed Biofilm Reactors: Evaluation Of Geometry, Attachment Surface Material And Biofilm Populations On The Uptake Of Ammonia And Synthetic Organic Contaminants In Wastewater., Patrick D. Mclee
Civil Engineering ETDs
Plastic biofilm carriers are used in biological wastewater treatment to encourage the attachment and retention of microorganisms that metabolize pollutants. The following research was conducted to better understand how different characteristics of the biofilm carrier affect the treatment performance of the attached biofilms in moving bed bioreactors. Lab scale reactors were used in this study to grow nitrifying biofilms in reactors with contrasting and controlled conditions. The effect of surface geometry on nitrification performance was evaluated by testing commercially available moving bed bioreactor media that contrast in physical design, and by varying operational parameters. Additionally, mature biofilm from a similar ...
Life Cycle Assessment In Foundry Sand Reclamation – Comparison Of Secondary Reclamation Processes, 2017 University of Nebraska-Lincoln
Life Cycle Assessment In Foundry Sand Reclamation – Comparison Of Secondary Reclamation Processes, Samuel Keith Ghormley
Environmental Engineering Theses and Graduate Student Research
Foundries represent a significant part of the base of the world’s economy and as a sector are one of the largest consumers of energy and producers of solid waste in the United States. Sand casting foundries use approximately 5-10% of their total energy on sand handling processes. By adding a secondary sand reclamation process, foundries can expect to become more energy efficient as well as reducing solid waste from the foundry. To measure the broader environmental impacts, life cycle assessment (LCA) can be used. The goal of the current research was to examine a medium-sized foundry in the United ...
Investigating Fate Of Silver Nanoparticles In Wastewater Biofilms, 2017 University of Arkansas, Fayetteville
Investigating Fate Of Silver Nanoparticles In Wastewater Biofilms, Connie Marie Walden
Theses and Dissertations
As industrial advances make everyday life easier for human kind, the processes by which we need to maintain sanitary conditions for both water and wastewater treatment will become increasingly complex. Innovations in food packaging and textile design incorporate engineered nanoparticles (ENPs) to increase antimicrobial properties of clothing, maintain product color, and keep food in packaging from spoilage. For most products, ENPs released will enter the sanitary sewer system, and ultimately wastewater treatment plants. Biofilms grow universally on surfaces where a protective layer of extracellular polymeric substances (EPS) shields attached cells from stressors. In wastewater treatment, complex biofilms are utilized as ...
Development Of Pre-Stressed Retrofit Strategies For Mitigating Fatigue Cracking In Steel Waterway Lock Gate Components, 2017 University of Arkansas, Fayetteville
Development Of Pre-Stressed Retrofit Strategies For Mitigating Fatigue Cracking In Steel Waterway Lock Gate Components, Christine Michelle Lozano
Theses and Dissertations
Lock gates are an important part of the transportation infrastructure within the United States (US), having many economic, safety, and environmental benefits over rail and highway transportation systems. Unfortunately, many existing lock gates throughout the US have reached or exceeded their initial design life and require frequent repairs to remain in service. Unscheduled repairs often increase as gates age, having a local economic impact on freight transport which can create economic ripples throughout the nation. Fatigue and corrosion are key causes of unscheduled service interruptions, degrading lock gate components over time. Additionally, because lock gates are submerged during operation, crack ...
Impact Of The China Pakistan Economic Corridor On Snow Cover And Glaciers In The Himalayan, Karakorum, And Hindukush Region, 2017 University of Massachusetts Amherst
Impact Of The China Pakistan Economic Corridor On Snow Cover And Glaciers In The Himalayan, Karakorum, And Hindukush Region, Liaqat Karim
Environmental & Water Resources Engineering Masters Projects
The Himalayan, Karakorum, and Hindukush (HKH) region is home to some of the world’s largest glaciers. These glaciers provide water resources for local people, yet numerous studies suggest a rapid decrease in their volume in recent decades. The change in the albedo of snow due to deposition of particulate matter (PM) is an important driver of this melting in addition to increased temperature. Here, we assess the change in albedo and melt rate within 50 km of Karakorum Highway (KKH) due to the increase in the traffic from China Pakistan Economic Corridor (CPEC), the multi-billion dollar flagship project under ...
Geophysical Delineation Of Megaporosity And Fluid Migration Pathways For Geohazard Characterization Within The Delaware Basin, Culberson County, Texas, 2017 Stephen F. Austin State University
Geophysical Delineation Of Megaporosity And Fluid Migration Pathways For Geohazard Characterization Within The Delaware Basin, Culberson County, Texas, Jonathan David Woodard
Electronic Theses and Dissertations
Differential dissolution of gypsum karst within the Delaware Basin poses a significant threat to infrastructure that society depends on. The study area is located in Culberson County, Texas and traverses a distance of approximately 54 kilometers along RM 652 within the Gypsum Plain which is situated on the northern margin of the Chihuahua Desert and includes outcrops of Castile and Rustler strata that host karst geohazards. Regions of karst geohazard potential have been physically surveyed proximal to the study area in evaporites throughout the Castile Formation outcrop; minimal hazards, in comparison to the Castile Formation, have been documented in ...
Setback Distance Requirements For Removal Of Swine Slurry Constituents In Runoff, 2017 Adjunct Professor, Biological Systems Engineering
Setback Distance Requirements For Removal Of Swine Slurry Constituents In Runoff, John E. Gilley, Shannon L. Bartelt-Hunt, Kent Eskridge, Xu Li, Amy M. Schmidt, Daniel D. Snow
Biological Systems Engineering: Papers and Publications
The use of setback distances for manure application on cropland areas adjacent to surface water bodies could serve a function similar to vegetative filter strips. However, little information currently exists to identify the setback distances necessary to effectively reduce the transport of contaminants in runoff. The objective of this study was to determine the effects of setback distance and runoff rate on concentrations of selected constituents in runoff following land application of swine slurry to a no-till cropland area in southeast Nebraska. The study site had a residue cover of 7.73 Mg ha-1 and a slope gradient of 4 ...
Stiffness Characterisation Of Full-Scale Airfield Test Pavements Using Computational Intelligence Techniques, 2017 Iowa State University
Stiffness Characterisation Of Full-Scale Airfield Test Pavements Using Computational Intelligence Techniques, Kasthurirangan Gopalakrishnan, Halil Ceylan
The falling weight deflectometer (FWD) is a non-destructive test equipment used to assess the structural condition of highway and airfield pavement systems and to determine the moduli of pavement layers. The backcalculated moduli are not only good pavement layer condition indicators but are also necessary inputs for conducting mechanistic based pavement structural analysis. In this study, artificial neural networks (ANNs)-based backcalculation models were employed to rapidly and accurately predict flexible airport pavement layer moduli from realistic FWD deflection basins acquired at the U.S. Federal Aviation Administration's National Airport Pavement Test Facility (NAPTF). The uniformity characteristics of NAPTF ...
Dynamic Characterization Of A Soft Elastomeric Capacitor For Structural Health Monitoring, 2017 Iowa State University
Dynamic Characterization Of A Soft Elastomeric Capacitor For Structural Health Monitoring, Simon Laflamme, Filippo Ubertini, Hussam Saleem, Antonella D'Alessandro, Austin R.J. Downey, Halil Ceylan, Annibale L. Materazzi
Structural health monitoring of civil infrastructures is a difficult task, often impeded by the geometrical size of the monitored systems. Recent advances in conducting polymers enabled the fabrication of flexible sensors capable of covering large areas, a possible solution to the monitoring challenge of mesoscale systems. The authors have previously proposed a novel sensor consisting of a soft elastomeric capacitor (SEC) acting as a strain gauge. Arranged in a network configuration, the SECs have the potential to cover very large surfaces. In this paper, understanding of the proposed sensor is furthered by evaluating its performance at vibration-based monitoring of large-scale ...
Moisture Susceptibility Of Subgrade Soils Stabilized By Lignin-Based Renewable Energy Coproduct, 2017 Iowa State University
Moisture Susceptibility Of Subgrade Soils Stabilized By Lignin-Based Renewable Energy Coproduct, Sunghwan Kim, Kasthurirangan Gopalakrishnan, Halil Ceylan
Sustainable use of biomass as a renewable source of energy can be an alternative solution to the cost of fossil-based energy and global warming. Production of biofuel from plant biomass results not only in bio-based energy, but also in coproducts containing lignin, modified lignin, and lignin derivatives. This paper discusses the moisture susceptibility of subgrade soil stabilized by bio-based energy coproducts containing lignin, with the aim of establishing a new application for bio-based energy coproducts in soil stabilization. An experimental test program was conducted to compare the moisture susceptibility of lignin coproduct-treated soils and traditional fly ash stabilizer-treated soil samples ...
Novel Nanocomposite Technologies For Dynamic Monitoring Of Structures: A Comparison Between Cement-Based Embeddable And Soft Elastomeric Surface Sensors, Filippo Ubertini, Simon Laflamme, Halil Ceylan, Annibale L. Materazzi, Gianluca Cerni, Hussam Saleem, Antonella D'Alessandro, Alessandro Corradini
The authors have recently developed two novel solutions for strain sensing using nanocomposite materials. While they both aim at providing cost-effective solutions for the monitoring of local information on large-scale structures, the technologies are different in their applications and physical principles. One sensor is made of a cementitious material, which could make it suitable for embedding within the core of concrete structures prior to casting, and is a resistor, consisting of a carbon nanotube cement-based transducer. The other sensor can be used to create an external sensing skin and is a capacitor, consisting of a flexible conducting elastomer fabricated from ...
Heated Transportation Infrastructure Systems: Existing Ande Emerging Technologies, 2017 Iowa State University
Heated Transportation Infrastructure Systems: Existing Ande Emerging Technologies, Halil Ceylan, Kasthurirangan Gopalakrishnan, Sunghwan Kim, W. Cord
Ice and snow on pavement surfaces cost the U.S. national economy in snow removal, damaged pavement and lost man-hours due to travel delay. Common practices for removing ice and snow from pavement surfaces include spraying anti-ice chemicals on the ground and deploying snowplowing vehicles. These methods are labor-intensive, occasionally ineffective at extremely low temperatures and have associated environmental concerns with possible contamination of nearby water bodies. Heated pavement systems (i.e., the concept of supplying heat to the pavement through an external or internal source) melt snow and ice without the need for anti-ice chemicals and snowplowing vehicles. A ...
A Predictive Model For Uniaxial Compressive Strength Of Carbonate Rocks From Schmidt Hardness, 2017 Iowa State University
A Predictive Model For Uniaxial Compressive Strength Of Carbonate Rocks From Schmidt Hardness, Murat Yurdakul, Halil Ceylan, Hurriyet Akdas
Uniaxial compressive strength (UCS) is considered to be one of the important parameters in rock engineering projects. In order to determine UCS, direct and indirect techniques are employed. In the direct approach, UCS is determined from the laboratory UCS test. In indirect techniques determine UCS based on the nondestructive test findings which can be easily and quickly performed and require relatively simple or no sample preparation. Indirect techniques are commonly preferred by rock and mining engineers because of their low cost and ease. This study presents the findings of an Artificial Neural Networks (ANN) based model for the prediction of ...