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Pavements Analysis And Design, Yang Huang, Kamyar Mahboub 2016 University of Kentucky

Pavements Analysis And Design, Yang Huang, Kamyar Mahboub

Kamyar C. Mahboub

No abstract provided.


Performance Of Reinforced Concrete Beams Strengthened With Mechanically-Fastened Composite System Under Corrosive Environment, Amna Zaid Suwaid Al Nassibi 2016 United Arab Emirates University

Performance Of Reinforced Concrete Beams Strengthened With Mechanically-Fastened Composite System Under Corrosive Environment, Amna Zaid Suwaid Al Nassibi

Theses

This study examines the effect of corrosion exposure on the flexural response of reinforced concrete (RC) beams strengthened with a powder-actuated fastened (PAF) composite system. Twenty-one RC beams were constructed and tested to failure under four-point bending. The corroded beams were subjected to 30, 60, and 100 days of accelerated corrosion that corresponded to measured tensile steel mass losses of 6, 11, and 18%, respectively. Other test parameters included width of the fiber reinforced polymer (FRP) composite strip, fastener length, and number of fasteners rows. For the uncorroded beams, the PAF-FRP system resulted in up to 24% increase in beam ...


Commuting By Customized Bus: A Comparative Analysis With Private Car And Conventional Public Transport In Two Cities, Tao Liu, Avishai Ceder, Romain Bologna, Benjamin Cabantous 2016 University of Auckland

Commuting By Customized Bus: A Comparative Analysis With Private Car And Conventional Public Transport In Two Cities, Tao Liu, Avishai Ceder, Romain Bologna, Benjamin Cabantous

Journal of Public Transportation

Commuting is a major component in the creation of traffic and travel problems. Thus, more attention should be given to its practice. Private car (PC) transport, the dominant mode of commuting in most of the world’s major cities, creates traffic-related social problems such as traffic congestion, traffic fatalities and injuries, and adverse environmental impacts. This study proposes a novel commuting travel mode—a customized bus (CB) transit system that provides advanced, personalized, and flexible demand-interactive minibus service using Internet, telephone, and smartphone apps. The aim was to assess and compare the performance of CB with PC and with conventional ...


Influence Of Socio-Demography And Operating Streetscape On Last-Mile Mode Choice, M. Meng, P. P. Koh, Y. D. Wong 2016 TUM CREATE

Influence Of Socio-Demography And Operating Streetscape On Last-Mile Mode Choice, M. Meng, P. P. Koh, Y. D. Wong

Journal of Public Transportation

This study investigated how personal and operational factors (travel distance and streetscape) influence traveler mode choice decisions for the last-mile home-bound trip stage from rail transit stations. Personal factors include the socio-demography of travelers, and attributes of the streetscape include the built environment (degree of areal development), prevalence of cycling, availability of short-range transport modes, and walking/cycling infrastructure. Interviewers randomly intercepted pedestrians to administer a mode choice survey at five rail transit station exits and engaged all available cyclists at bicycle parking areas in the vicinity of stations in Singapore. A multimodal logit regression model revealed a significant relationship ...


Factors Influencing Demand For Buses Powered By Alternative Energy Sources, Janer Galván, Victor Cantillo, Julian Arellana 2016 Universidad del Norte

Factors Influencing Demand For Buses Powered By Alternative Energy Sources, Janer Galván, Victor Cantillo, Julian Arellana

Journal of Public Transportation

Transit buses consume high amounts of fossil fuels, with the consequent release of greenhouse gases into the atmosphere. In recent decades, much effort has been concentrated on the development of cleaner fuels to mitigate this externality. However, market shares for cleaner-fueled buses are still modest, which is why it is relevant to evaluate the aspects influencing their acceptance. This article presents an econometric model to evaluate factors influencing demand for transit buses in Colombia powered by cleaner fuels. For this purpose, a stated preference survey was applied to public transportation entrepreneurs. Results suggest that the target population considers acquisition cost ...


Uncertainty Considerations In Calibration And Validation Of Hydrologic And Water Quality Models, J. Hernandez 2016 Boise State University

Uncertainty Considerations In Calibration And Validation Of Hydrologic And Water Quality Models, J. Hernandez

Jairo E. Hernández

Hydrologic and water quality models (HWQMs) are increasingly used to support decisions on various environmental issues and policy directions for present and future scenarios, at scales varying from watershed to continental levels. Uncertainty associated with such models may affect the ability of the models to accurately evaluate the response of complex systems, leading to misguided assessments and risk management decisions. Current well-known HWQMs contain numerous input parameters, many of which are not known with certainty, and in other cases model users can hardly recognize the genesis of uncertainty. Uncertainty in data, model structure, and model parameters can propagate throughout model ...


Biogenic Organic Carbon Compounds In Air And Rain, Iman Hosseini Shakib 2016 University of Massachuestts Amherst

Biogenic Organic Carbon Compounds In Air And Rain, Iman Hosseini Shakib

Environmental & Water Resources Engineering Masters Projects

Rainwater quality has not been an issue of concern until recent decades of increasing urbanization and industrialization. Therefore, the role of biogenic contamination sources has been always underestimated as generally, anthropogenic contaminants are thought to be responsible for rainwater quality deterioration. This study aims to find the sources and reasons of biogenic VOC emission into the air and their changes in the air. Also, transfer of biogenic VOCs into the rainwater and their abundance have been investigated. The effects of these biogenic VOCs on rainwater quality have been studied by sampling of two rain events in the University of Massachusetts ...


The Influence Of Sediment Characteristics On The Fate Of Steroidogenic Compounds In Aquatic Systems And The Effects On Progesterone Bioavailability In A Target Organism, Jodi L. Sangster 2016 University of Nebraska-Lincoln

The Influence Of Sediment Characteristics On The Fate Of Steroidogenic Compounds In Aquatic Systems And The Effects On Progesterone Bioavailability In A Target Organism, Jodi L. Sangster

Civil Engineering Theses, Dissertations, and Student Research

There is growing concern about the biologic effects stemming from steroids in impacted waterways. In aquatic systems, interaction between steroids and sediment influence both contaminant fate as well as subsequent bioavailability to aquatic organisms. The focus of this dissertation research was to gain a better understanding of steroid behavior in aquatic systems based on the physiochemical properties of sediment and to use this knowledge to better understand the biological effects stemming from sediment-associated progesterone exposure. Two natural aquatic sediments, a sand and a silty loam, were selected to represent marked differences in sediments properties. Initially, sorption of 17β-estradiol, estrone, progesterone ...


Volume-Change Restraining Effects In Continuous Precast/Prestressed Bridge Girders, Athul Alex 2016 University of Nebraska-Lincoln

Volume-Change Restraining Effects In Continuous Precast/Prestressed Bridge Girders, Athul Alex

Civil Engineering Theses, Dissertations, and Student Research

A variety of design and construction practices are feasible when building precast concrete continuous bridges with long spans. Precast, prestressed concrete continuous bridges have been implemented by countries around the world. Although these bridges have been in service for many years, there has been limited verification of the ability of connection to provide the predicted continuity. Subsequently many states in the United States design the girders as simple spans for both dead and live loads without considering any moments developed by the connection. The effect of thermal expansion and contraction is hardly considered in the analysis, even though it is ...


Microbial Degradation Of Sulfonamide Antibiotics, Rachel Levine 2016 University of Nebraska-Lincoln

Microbial Degradation Of Sulfonamide Antibiotics, Rachel Levine

Civil Engineering Theses, Dissertations, and Student Research

Certain microbes can transform antibiotics in the environment. However, little is known about the identity of these microbes and their antibiotic biotransformation processes. The objectives of this study were to (1) isolate bacterial strains capable of transforming antibiotics, (2) determine the biotransformation kinetics of antibiotics, (3) characterize the effects of background carbons on the biotransformation kinetics, and (4) identify biotransformation products under various environmental conditions. Sulfadiazine (SDZ) was used as the model antibiotic in this study due to its frequent occurrence in livestock wastes. Surface soil from a cattle feedlot was collected to enrich potential SDZ degrading bacteria. A mixed ...


Performance Assessment Of Deteriorated And Retrofitted Steel Hp Piles, Steven T. Stauffer 2016 University of Nebraska-Lincoln

Performance Assessment Of Deteriorated And Retrofitted Steel Hp Piles, Steven T. Stauffer

Civil Engineering Theses, Dissertations, and Student Research

Deterioration of aging bridges can be attributed to an assortment of mechanisms throughout the structure, with remediation policies also varying. This study focused on assessing the validity of the Nebraska Department of Roads’ (NDOR) reinforced concrete encasement retrofit for corroded steel HP piles. Experiments were designed and conducted to test the capacity of the NDOR retrofit and evaluate failure limit states. Two pile locations were considered: abutment and pile bent. For each location there was a non-deteriorated, deteriorated, and retrofitted case. These cases represented the pile at key stages during its life. NDOR’s concrete encasement retrofit provided the required ...


Analysis Of Bolted Beam-Column Connections With Multiple Bolts Per Row And Column Web Stiffeners, Benjamin C. Sutherland 2016 bcsuther

Analysis Of Bolted Beam-Column Connections With Multiple Bolts Per Row And Column Web Stiffeners, Benjamin C. Sutherland

Civil Engineering Undergraduate Honors Theses

Bolted beam-column connections are a common moment connection used in the design of steel buildings. Existing design guides include design parameters for bolt configurations having one bolt on either side of the beam web for each row of bolts. There is potential for increasing connection strength by adding additional bolts on the outside of these rows. This addition could be useful in retrofit scenarios, or even in the design of new structures. In this research, finite element analysis is used to analyze various beam-column connections and t-stub connections. The modeling methods, research process, and conclusions are explained in the thesis ...


Second Creek Monitoring, Haley Whitaker, Aaron Young, Ryan Wagner, Saajid Haque, Benjamin Parrott, Richard Fagan 2016 University of Tennessee, Knoxville

Second Creek Monitoring, Haley Whitaker, Aaron Young, Ryan Wagner, Saajid Haque, Benjamin Parrott, Richard Fagan

University of Tennessee Honors Thesis Projects

No abstract provided.


Improved Methodologies In Modeling And Predicting Failure In Aashto M-180 Guardrail Steel Using Finite Element Analysis - Phase I, Brandt M. Humphrey 2016 University of Nebraska-Lincoln

Improved Methodologies In Modeling And Predicting Failure In Aashto M-180 Guardrail Steel Using Finite Element Analysis - Phase I, Brandt M. Humphrey

Civil Engineering Theses, Dissertations, and Student Research

Steel guardrail systems have historic and widespread applications throughout the nation’s highways and roadways. However, catastrophic system failure can occur if the guardrail element ruptures, thus allowing an errant vehicle to pass uncontrolled through the system and potentially allow fractured ends to pierce the occupant compartment. To aid in the analysis and design of guardrail systems, further efforts are needed to develop and implement more reliable material failure criteria to predict and model guardrail steel rupture under all vehicle impact loading scenarios within impact simulation finite element method (FEM) software, such as LS-DYNA.

This Phase I study accomplished a ...


A Mobile Canoe-Mounted, Geo-Referenced, 3-D Water Quality Analyzer, Alex Shpik, Alysse Ness, Ryan Vernich 2016 University of Tennessee - Knoxville

A Mobile Canoe-Mounted, Geo-Referenced, 3-D Water Quality Analyzer, Alex Shpik, Alysse Ness, Ryan Vernich

EURēCA: Exhibition of Undergraduate Research and Creative Achievement

Water quality analysis is vital to ensure the health of water sources, as well as identifying pollutants and modeling how they affect a river system. Current methods of collecting water samples consist of stationary samplers that measure changes in water quality at only one location over time. We have designed a mobile, canoe-mounted, water quality analyzing system that will enable researchers to efficiently collect a large number of water quality samples with an associated GPS location and depth for each data point. While the canoe travels in parallel swaths bank to bank, the unit will alternately collect samples from 3 ...


Improving Functionality And Sustainability Of Commercial Insulation: Experimental Study, Heat Transfer Modeling, Environmental Assessment, Celine Manoosingh 2016 University of South Florida

Improving Functionality And Sustainability Of Commercial Insulation: Experimental Study, Heat Transfer Modeling, Environmental Assessment, Celine Manoosingh

Celine F. Manoosingh

he Department of Energy names executing and integrating high-performance sustainable design and green building best practices a Strategic Sustainability Performance Plan goal under the Executive Order 13514 (U.S DOE, 2009). As sustainability becomes a primary

goal for engineers, a decision making framework is needed to guide their choice of materials and processes; and then to carry out the evaluation of their chosen design. Sustainable design process, and the products developed through its application, work concurrently with functionality and sustainability evaluation methodologies to cultivate a continuous loop of design, implementation, assessment and improvement. In this context, an alternative insulation prototype ...


Improving Energy Efficiency And Environmental Sustainability Of Commercial Insulation, Celine F. Manoosingh, James Mihelcic, Manjriker Gunaratne 2016 Georgia Southern University

Improving Energy Efficiency And Environmental Sustainability Of Commercial Insulation, Celine F. Manoosingh, James Mihelcic, Manjriker Gunaratne

Celine F. Manoosingh

With increasingly stringent energy standards set in place by the Department of Energy, energy efficiency is becoming a paramount concern to manufacturers of appliances. Additionally, the production and disposal of the voluminous amount of polyurethane foam commonly utilized as insulation in refrigeration units poses a significant environmental challenge. In this context, this study investigated an alternative insulation for use in commercial refrigerator/freezer units. A prototype exploring the use of evacuated packets of pyrogenic silica substituting for conventional insulation was assessed. Assessment criteria included experimental comparison of heat transfer characteristics and the energy efficiency of the new insulation as well ...


Bacteria Source Tracking On The Vernon River Watershed: Lessons Learned By The City Of Savannah, Peter D. Rogers, Zachary Strickland, Laura Walker 2016 Georgia Southern University

Bacteria Source Tracking On The Vernon River Watershed: Lessons Learned By The City Of Savannah, Peter D. Rogers, Zachary Strickland, Laura Walker

Peter D. Rogers

No abstract provided.


The Gila River Community Water Rights Settlement And Its Impact On Water Resource Management, Peter D. Rogers, Stephanie M. Edmiston 2016 Georgia Southern University

The Gila River Community Water Rights Settlement And Its Impact On Water Resource Management, Peter D. Rogers, Stephanie M. Edmiston

Peter D. Rogers

The Arizona Water Settlements Act of 2004 ended nearly four decades of water disputes between the Gila River Indian Community and the state of Arizona. This paper explores the historical background of the Gila River Indian Community and its claim to water rights, the evolution of tribal water rights laws that culminated in the historic settlement, and the consequences of the act on water resource management in the region. It also links the findings from this case to the broader field of indigenous water rights studies from other regions of the world.


Student Spotlight On Research And Outreach Proceedings, SUNY College of Environmental Science and Forestry 2016 SUNY College of Environmental Science and Forestry

Student Spotlight On Research And Outreach Proceedings, Suny College Of Environmental Science And Forestry

Student Spotlight on Research and Outreach

ESF's annual Spotlight Symposium is a dynamic forum where graduate and undergraduate students share the results of their research and community service projects. The Spotlight is a student poster session highlighting scholarly efforts.


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