Open Access. Powered by Scholars. Published by Universities.®
- Institution
-
- Clemson University (50)
- Western University (39)
- University of South Florida (28)
- California Polytechnic State University, San Luis Obispo (27)
- Brigham Young University (26)
-
- University of Central Florida (26)
- Utah State University (25)
- Purdue University (21)
- University of Tennessee, Knoxville (21)
- University of Texas at El Paso (21)
- Louisiana State University (19)
- Universidad de La Salle (19)
- Michigan Technological University (17)
- University of Kentucky (17)
- University of Nevada, Las Vegas (15)
- University of South Carolina (15)
- University of Wisconsin Milwaukee (15)
- Munster Technological University (14)
- Portland State University (14)
- University of Arkansas, Fayetteville (13)
- Missouri University of Science and Technology (12)
- Air Force Institute of Technology (10)
- New Jersey Institute of Technology (8)
- University of Mississippi (8)
- Old Dominion University (7)
- Santa Clara University (7)
- University of Massachusetts Amherst (7)
- Western Michigan University (6)
- Wayne State University (5)
- Marquette University (4)
- Keyword
-
- Applied sciences (16)
- Civil engineering (9)
- Concrete (9)
- Optimization (9)
- Bridges (8)
-
- Hydrology (8)
- Modeling (7)
- Senior thesis -- Santa Clara University -- Department of Civil Engineering (7)
- Corrosion (6)
- GIS (6)
- Fatigue (5)
- Groundwater (5)
- Life cycle assessment (5)
- Remediation (5)
- Safety (5)
- Uncertainty (5)
- Acoustic Emission (4)
- Biodegradation (4)
- Bridge abutment (4)
- Climate change (4)
- Construction (4)
- Drinking water (4)
- Earth sciences (4)
- Lateral resistance (4)
- Rehabilitation (4)
- Steel (4)
- Water treatment (4)
- Abutment (3)
- Adsorption (3)
- Ammonia (3)
- Publication
-
- Theses and Dissertations (67)
- Electronic Thesis and Dissertation Repository (39)
- All Theses (33)
- Electronic Theses and Dissertations (33)
- USF Tampa Graduate Theses and Dissertations (28)
-
- Master's Theses (24)
- Masters Theses (21)
- Open Access Theses & Dissertations (21)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (19)
- Doctoral Dissertations (19)
- Theses (18)
- All Dissertations (17)
- Open Access Dissertations (17)
- Dissertations and Theses (16)
- Dissertations, Master's Theses and Master's Reports - Open (16)
- UNLV Theses, Dissertations, Professional Papers, and Capstones (15)
- Ingeniería Civil (14)
- Theses and Dissertations--Civil Engineering (13)
- Open Access Theses (11)
- LSU Master's Theses (10)
- Graduate Theses and Dissertations (9)
- LSU Doctoral Dissertations (9)
- Civil & Environmental Engineering Theses & Dissertations (7)
- Civil, Environmental and Sustainable Engineering Senior Theses (7)
- Dissertations (7)
- All Graduate Plan B and other Reports, Spring 1920 to Spring 2023 (5)
- Wayne State University Dissertations (5)
- Civil Engineering Undergraduate Honors Theses (4)
- Ingeniería Ambiental y Sanitaria (4)
- Maritime Safety & Environment Management Dissertations (Dalian) (4)
Articles 1 - 30 of 549
Full-Text Articles in Engineering
Water Vapor Movement In Freezing Aggregate Base Materials, Maile Anne Rogers
Water Vapor Movement In Freezing Aggregate Base Materials, Maile Anne Rogers
Theses and Dissertations
The objectives of this research were to 1) measure the extent to which water vapor movement results in water accumulation in freezing base materials; 2) evaluate the effect of soil stabilization on water vapor movement in freezing base materials; 3) determine if the corresponding changes in water content are sufficient to cause frost heave during winter; 4) determine if the corresponding changes in water content are sufficient to cause reductions in stiffness during spring; 5) evaluate relationships between selected material properties, freezing conditions, and the occurrence and impact of water vapor movement; and 6) numerically simulate heat and water movement …
Condition Assessment Of Decommissioned Bridge Decks Treated With Waterproofing Membranes And Asphalt Overlays, Eric Scott Sumsion
Condition Assessment Of Decommissioned Bridge Decks Treated With Waterproofing Membranes And Asphalt Overlays, Eric Scott Sumsion
Theses and Dissertations
The objective of this research was to assess the condition of four decommissioned bridge decks treated with waterproofing membranes and asphalt overlays following the completion of their service lives. Large samples were cut from each of the bridge decks immediately prior to demolition and taken to the Brigham Young University Highway Materials Laboratory, where extensive sampling and testing was performed. Methods used to evaluate the condition of the bridge deck samples included visual inspection, hammer sounding, Schmidt rebound hammer testing, resistivity testing, half-cell potential testing, linear polarization testing, cover depth measurement, and chloride concentration measurement. The samples were removed from …
Frost Susceptibility Of Base Materials Treated With Asphalt Emulsion, Noelle Anderson
Frost Susceptibility Of Base Materials Treated With Asphalt Emulsion, Noelle Anderson
Theses and Dissertations
The objective of this research was to investigate emulsion-treated base (ETB) frost susceptibility in terms of both freeze-thaw cycling and frost heave. The research performed in this study involved laboratory testing of ETB materials sampled from both the Redwood Road and 7800 South reconstruction projects in northern Utah. The effects of freeze-thaw cycling were evaluated by comparing the stiffness and strength of tested specimens to the same properties of control specimens not subjected to freeze-thaw cycling. Frost heave testing enabled evaluation of the effects of emulsion content and degree of curing on the volumetric stability of ETB materials during sustained …
Developing Guidelines For Including Mobility-Based Performance Specifications In Highway Construction Contracts, Shawn J. Larson
Developing Guidelines For Including Mobility-Based Performance Specifications In Highway Construction Contracts, Shawn J. Larson
Theses and Dissertations
Construction zones can greatly affect the traffic flow on roadways, especially when lane closures are required. Traditionally, the Utah Department of Transportation (UDOT) has used traffic management specifications that only allow lane closures and road work to be done during predetermined hours or specifications that require a certain number of lanes to be open at all times. Recently, mobility-based work-zone traffic flow maintenance has been considered. This method requires continuous monitoring of mobility-based performance data and a mechanism to send alerts to the contractors when the mobility data does not meet the standards set by the specifications. UDOT recently tested …
The Performance Of Risk Management And Innovation In Construction Manager/General Contractor Delivery In Civil Construction Applications, Rebecca M. Owens
The Performance Of Risk Management And Innovation In Construction Manager/General Contractor Delivery In Civil Construction Applications, Rebecca M. Owens
Theses and Dissertations
Project teams that deliver high risk, complex projects in the civil construction industry need tools to enable successful delivery. Construction Manager/General Contractor (CM/GC) is an innovative alternate delivery method, providing one such a tool. CM/GC furnishes public agencies with an attractive option for delivering projects in a less adversarial and more constructive manner by involving the contractor during design. The sophisticated public owner does not have to relinquish control of the details of the design in order to accelerate the schedule or see the benefits of real-time cost estimating data. There are also significant cost and schedule benefits with not …
Numerical Modelling Of Downburst Interaction With Bluff Body, Aditi Jog
Numerical Modelling Of Downburst Interaction With Bluff Body, Aditi Jog
Electronic Thesis and Dissertation Repository
The objective of this study is to investigate the interaction of a bluff body with a downburst flow. Numerical investigation of the flow field using CFD analysis was carried out for three different downburst sizes (h/d=1, 2, 4) under suitable boundary conditions subjected to constant jet velocity. The downburst-structure interaction study was conducted for two jet diameters (h/d=1 and 4) and two radial locations from the downburst center.
The results showed that the downburst size greatly dominates the intensity of the flow. The largest downburst resulted in the highest velocity magnitude near the ground and also covered a larger area …
Introducing The Vuepod: Development And Testing Of A Low-Cost Large-Scale Stereoscopic Immersive System Using 3d Lcd Televisions, Shane Makana Hayden
Introducing The Vuepod: Development And Testing Of A Low-Cost Large-Scale Stereoscopic Immersive System Using 3d Lcd Televisions, Shane Makana Hayden
Theses and Dissertations
3D immersive visualization systems, or CAVEs™, have found wide adoption for use in geosciences, planetary science, medical research, and computer science. However, much of the potential for such systems in practical civil and environmental engineering settings has been severely limited due to 1) extreme costs in both hardware and software; 2) immobility due to calibration and darkroom requirements; and 3) extensive and expensive manpower requirements for both operation and maintenance. This thesis presents the development and testing of a new mobile low-cost immersive stereo visualization system -- the "VuePod" -- that attempts to address these challenges through the use of …
Specimen Size Effect On Shear Behavior Of Loose Sand In Triaxial Testing, Tarek Omar
Specimen Size Effect On Shear Behavior Of Loose Sand In Triaxial Testing, Tarek Omar
Electronic Thesis and Dissertation Repository
Triaxial tests are widely used to determine the behavior and strength characteristics of soils without due attention to the differences in specimen size. Several drained and undrained monotonic triaxial compression shear tests are performed on three different specimen sizes of the same sand to investigate the influence of specimen size and scale effect on the shear behavior. The test results indicate that the behavior of loose sand is strongly influenced by the specimen size, with larger specimens exhibiting a stiffer behavior during isotropic compression, and mobilizing smaller shear strengths and effective friction angles. Triaxial testing also involves many sources of …
Experimental Modeling Of Wind Farm Topography And Canopy, Dan S. Parvu
Experimental Modeling Of Wind Farm Topography And Canopy, Dan S. Parvu
Electronic Thesis and Dissertation Repository
As an important renewable energy source for electricity generation, wind energy must rely on efficient and accurate wind resource assessment for the siting and the design of wind farms. Traditionally relying on numerical modeling, current wind farms built in Canada, notably, experience an under-performance in terms of power generation. This work studies an alternative approach to wind farm modeling through experimental wind tunnel testing.
The objective of the work is to develop methodologies on how topographic and forest canopy models should be built as scale models of full scale wind farms. The models developed are validated by comparing the data …
Structural Analysis And Optimization Of Skyscrapers Connected With Skybridges And Atria, Amy Jean Taylor Mccall
Structural Analysis And Optimization Of Skyscrapers Connected With Skybridges And Atria, Amy Jean Taylor Mccall
Theses and Dissertations
Skybridges and atria between buildings are becoming more and more popular. Most current skybridge connections are either roller or rigid-connections. This dissertation presents an investigation of the structural analysis and optimization of skyscraper systems with hinge-connected skybridges, and compares the results to skyscraper systems with roller-connected skybridges and to skyscraper systems without skybridges altogether. Also presented is an investigation of the structural analysis and optimization of skyscrapers both with and without atria between the buildings. It was assumed that the atria envelope was constructed with cushions made from lightweight, transparent, and flexible Ethylene Tetrafluoroethylene (ETFE). A simplified skyscraper skybridge model …
Investigation Of Hollow Bar Micropiles In Cohesive Soil, Osama F. El Hadi Drbe
Investigation Of Hollow Bar Micropiles In Cohesive Soil, Osama F. El Hadi Drbe
Electronic Thesis and Dissertation Repository
Micropiles are used in various applications, including low capacity micropile networks, underpinning and seismic retrofitting of existing foundations and high capacity foundations for new structures. They facilitate fast installation with a high degree of ground improvement. The current Federal Highway Administration (FHWA) design guidelines designate hollow bar micropiles as Type B micropiles, even though their construction technique is different than typical Type B, which results in overly conservative design. In addition, the current practice for construction of hollow bar micropiles is limited to drilling bit/hollow bar diameter ratio of 2.5 or less. In this thesis, full-scale load tests were conducted …
Treatment Of Combined Sewer Overflows Using Ferrate (Vi), Rohan Gandhi
Treatment Of Combined Sewer Overflows Using Ferrate (Vi), Rohan Gandhi
Electronic Thesis and Dissertation Repository
Prevention of pollution from combined sewer overflows (CSOs) is currently a major concern due to their impact on aquatic and human environment. With the stringent regulations related to the CSOs treatment, it is necessary to develop an efficient, fast and low cost treatment technique that meets the applicable criteria. In this work, the comprehensive study was done to determine the efficiency of ferrate (VI) for the treatment of CSOs. At a Fe (VI) dose of 0.24 mg/l, TCOD, SCOD, TBOD5, SBOD5, TSS, VSS, TP, TN and soluble TN removal efficiencies of 71%, 75%, 69%, 68%, 72%, …
Cyclic And Post-Cyclic Response Of Silt And Sandy Silt Soils, Ali El Takch
Cyclic And Post-Cyclic Response Of Silt And Sandy Silt Soils, Ali El Takch
Electronic Thesis and Dissertation Repository
A series of cyclic and monotonic constant-volume ring shear tests were carried out to determine the cyclic and post-cyclic response of silts and sandy silts with 25% and 50% sand. The elastic soil behavior at very small shear strain (γ < 10-4%) was investigated through shear wave velocity (Vs) measurements using bender elements at vertical stresses ranging from 50 to 300 kPa, while strain-controlled constant volume cyclic ring shear tests were conducted to establish shear modulus (G) and damping ratio (D) at larger shear strain amplitudes (γ > 0.01%). Liquefaction and strain-softening occurred at excess pore water pressure ratios (ru …
Rural To Urban Intercity Transit User Characteristics Analysis, Demand Estimation And Network Design, Hongtai Yang
Rural To Urban Intercity Transit User Characteristics Analysis, Demand Estimation And Network Design, Hongtai Yang
Doctoral Dissertations
Rural transit always plays a critical role in transporting rural residents, especially the ones who do not have a car, cannot drive, or choose not to drive. Intercity bus (ICB), deviated fixed route transit (DFRT) and demand responsive transit (DRT) are three major modes of rural public transportation. Although there are more DFRT and DRT service providers and services in the US, due to institutional issues, there are much more studies about ICB than DFRT and DRT. Meanwhile, state governments are struggling on how to improve the rural transit system with limited budget. This dissertation is aimed to fill the …
Bond Performance Of High-Capacity Strands In High Strength Concrete, Xin Jiang
Bond Performance Of High-Capacity Strands In High Strength Concrete, Xin Jiang
Doctoral Dissertations
18-mm-diameter (0.7-in.) strand has the ability to introduce almost twice the prestressing force of 13-mm-diameter (0.5-in.) strand and 135% of the prestressing force of 15-mm-diameter (0.6-in.) strand, which could result in a significant increase in the span capacity of the current AASHTO bulb tee girders without having to modify the sections or acquire new forms. To date, the information regarding the bond performance of 18-mm-diameter (0.7-in.) prestressing strand is very limited, preventing its application despite its attractive high-strength. Also, our understanding of the bond mechanism is incomplete and non-quantitative; a rational understanding of the bond mechanism would help predict the …
Bedload Transport Sampling, Characterization And Modeling On A Southern Appalachian Ridge And Valley Stream, Patrick Lasater Mcmahon
Bedload Transport Sampling, Characterization And Modeling On A Southern Appalachian Ridge And Valley Stream, Patrick Lasater Mcmahon
Doctoral Dissertations
Estimates of bedload transport rates developed from existing transport models are notoriously inaccurate(Wilcock 2001). The gravel bed models addressed in this study include the Meyer-Peter and Muller; Parker, Klingeman, and McLean; and Wilcock two-fraction models. The question of whether or not these models predict bedload transport rates in a Southern Appalachian Ridge and Valley stream is complicated by the fact that these models have only been previously assessed in terms of their agreement with bedload transport rates measured in the Western regions of the U.S. Further, due to the strongly non-linear form of bedload transport models discrete errors and cumulative …
Effects Of Data Resolution And Human Behavior On Large Scale Evacuation Simulations, Wei Lu
Effects Of Data Resolution And Human Behavior On Large Scale Evacuation Simulations, Wei Lu
Doctoral Dissertations
Traffic Analysis Zones (TAZ) based macroscopic simulation studies are mostly applied in evacuation planning and operation areas. The large size in TAZ and aggregated information of macroscopic simulation underestimate the real evacuation performance. To take advantage of the high resolution demographic data LandScan USA (the zone size is much smaller than TAZ) and agent-based microscopic traffic simulation models, many new problems appeared and novel solutions are needed. A series of studies are conducted using LandScan USA Population Cells (LPC) data for evacuation assignments with different network configurations, travel demand models, and travelers’ compliance behavior.
First, a new Multiple-Source-Nearest-Destination Shortest Path …
Investigation Of Asphalt Pavement Mixture Blending Utilizing Analytical Chemistry Techniques, Benjamin Frank Bowers
Investigation Of Asphalt Pavement Mixture Blending Utilizing Analytical Chemistry Techniques, Benjamin Frank Bowers
Doctoral Dissertations
The use of Reclaimed Asphalt Pavement (RAP) in new pavement mixtures is a topic of interest throughout the transportation industry and academia due its economic and environmental implications. There is concern however about how well the binder from the RAP blends with new, virgin binder when the mixture is created. Insufficient blending of the aged and unaged binders may compromise the long-term pavement performance. In this study, an enhanced staged extraction method is coupled with two chemical testing techniques to develop a novel approach for evaluating blending efficiency from a qualitative and quantitative perspective: Gel Permeation Chromatography (GPC) and Fourier …
Sodhana Environmental - Final Design Report, Eric Taylor, Corissa Bellis, Cody Perez, Cameron Zeller
Sodhana Environmental - Final Design Report, Eric Taylor, Corissa Bellis, Cody Perez, Cameron Zeller
Mechanical Engineering
A fully designed cost-effective, sustainable, toilet for the developing world.
Seasonal Change In Bacteria Levels And Eluent Comparison For The Enumeration Of E. Coli And Enterococci From Recreational Beach Sand, Kyle Hines
Theses and Dissertations
Research into the causes of bacterial contamination of recreational beaches has been increasing. Many researchers are now looking to enumerate bacteria from beach sands in order to find the connections between the water and sand quality. As the number of these studies increase, there is a need to determine a standard procedure for enumerating bacteria from sand. The eluent that a researcher chooses could impact the results that they obtain due to ionic strength. The first part of this paper compares the E. coli and Enterococci counts of identical sand samples using phosphate buffered saline and distilled water as eluents. …
Assessing Trichloromethane Formation And Control In Algal-Stimulated Waters Amended With Nitrogen And Phosphorus, Clinton Mash
Assessing Trichloromethane Formation And Control In Algal-Stimulated Waters Amended With Nitrogen And Phosphorus, Clinton Mash
Graduate Theses and Dissertations
Nitrogen (N) and phosphorus (P) enrichments can stimulate algal growth in drinking water sources, which can cause increased production of disinfection byproduct (DBP) precursors. However, the effect of systematic N and P enrichments on DBP formation and control has not been adequately studied. In this work, we enriched samples from a drinking water source - sampled on April 5, May 30, and August 19, 2013 - with N and P to stimulate algal growth at N:P ratios covering almost five orders of magnitude (0.2-4,429). To simulate DBP-precursor removal processes at drinking water treatment plants (DWTPs), the samples were treated with …
Assessing The Impact Of Chlorine Residual On Trihalomethane And Haloacetonitrile Formation Under Chlorination And Chloramination Disinfection Regimes, Thien Duc Do
Graduate Theses and Dissertations
A disinfection byproduct (DBP) formation potential (FP) test can be used to indirectly measure the concentration of DBP precursors in natural waters, permitting assessment of various DBP-related treatment processes and control strategies. While these tests require a 7-day chlorine residual (CR) between 3-5 mg L-1 as Cl2, it is not well known if this recommended residual corresponds to the true DBPFP (i.e., the maximum concentrations) for trihalomethanes (THMs) and haloacetonitriles (HANs). In this study, THMs and HANs were quantified as a function of CR under three common disinfection regimes: (1) free chlorine at pH 7.0 (FC7), (2) …
Development Of Novel Bioelectrochemical Systems For In Situ Nitrate Removal From Groundwater, Yiran Tong
Development Of Novel Bioelectrochemical Systems For In Situ Nitrate Removal From Groundwater, Yiran Tong
Theses and Dissertations
This study aims to develop new approaches for in situ nitrate removal from groundwater by using bioelectrochemical systems (BES). BESs employ bioelectricity generated from organic compounds to drive nitrate moving from groundwater into the electrode chamber and reduce nitrate to nitrogen gas by heterotrophic denitrification. In first phase experiments, nitrate ions were driven into the anode chamber of a de-coupled reactor, whose electrode chambers were separated, where heterotrophic denitrification took place with organic reduction. It was proved that by applying additional electrical potential at 0.8V, the reactor could achieve highest removal rate of 208.2±13.3 g NO3--N/m3/d, when initial nitrate concentration …
Using Bioelectrochemical Systems For Sustainable Desalination, Bo Zhang
Using Bioelectrochemical Systems For Sustainable Desalination, Bo Zhang
Theses and Dissertations
Desalination of seawater or brackish water holds the potential to solve the freshwater shortage that is threatening nearly half of the world population. Current desalination technologies are energy intensive, which makes the desalinated water prohibitively expensive. In this study, investigations have been made to use renewable energy sources from organic waste to power the desalination process. Since desalination is driven by renewable energy, such desalination systems are more sustainable than currently wide employed commercial technologies. Efforts have been made to study how to operate BES driven desalination process such that the energy consumption will be minimized. Forward osmosis technology is …
Impacts Of Climate Changes On The Spatiotemporal Distribution Of Precipitation In The Western United States, Peng Jiang
Impacts Of Climate Changes On The Spatiotemporal Distribution Of Precipitation In The Western United States, Peng Jiang
UNLV Theses, Dissertations, Professional Papers, and Capstones
Precipitation in the Intermountain West is characterized by its great variability in both spatial and temporal distributions. Moreover, the spatiotemporal distribution of the precipitation is changing due to the climate changes. In this dissertation, three studies are conducted to investigate the multi-scale temporal variability of precipitation, the performance of current climate models on this variability, the influence of large-scale ocean oscillations on heavy precipitation, and the impact of human induced global warming on storm properties.
The first study is to examine the performance of current climate models on the simulation of the multi-scale temporal variability determined from the observed station …
Feasibility Of The Use Of Ultrasound Measurements For Grade Verification Of The Performance Grade Asphalt Binders, Mehdi Khalili
Feasibility Of The Use Of Ultrasound Measurements For Grade Verification Of The Performance Grade Asphalt Binders, Mehdi Khalili
UNLV Theses, Dissertations, Professional Papers, and Capstones
This research investigates the feasibility of application of high frequency immersion ultrasonic measurement (UM) to discriminate different performance grade (PG) asphalt binders. PG asphalt binder is one of the main components of hot mix asphalt used for roadway construction. UT may provide an inexpensive alternative to sophisticated tests currently used for quality control of PG asphalt binders. Nine different PG asphalt binders used were selected for this investigation. Velocity (V) and integrated response (IR) of the ultrasonic wave were measured. The IR is a measure of the ratio of ultrasonic energy transmitted into the material to the ultrasonic energy reflected …
A Case Study Of Zero Energy Home Built For Solar Decathlon Competition 2013, Sanjib Mulepati
A Case Study Of Zero Energy Home Built For Solar Decathlon Competition 2013, Sanjib Mulepati
UNLV Theses, Dissertations, Professional Papers, and Capstones
Energy consumption in residential homes has been a subject of research related to sustainability. Reduction in the consumption of energy is a goal of sustainable construction. The Department of Energy (DOE) started a Solar Decathlon competition in 2002 in which the students from different universities around the globe build an energy efficient and affordable home suitable for their climate and location. The main goal of this competition is to select the best home that is designed and built in a sustainable way. In this study, the home designed and constructed for participation in the competition by the students at University …
A Comparative Study Of Performance, Impediments, Advantages, And Disadvantages Of Construction And Professional Disadvantaged Business Enterprises, Ravi Sharma
UNLV Theses, Dissertations, Professional Papers, and Capstones
Construction and professional disadvantaged, minority, and women business enterprises (DBE/MBE/WBEs) face several impediments that hinder their business growth. A questionnaire survey was conducted to determine the important factors that affect their business performance, impediments faced by these business enterprises, advantages, and disadvantages of being DBE (DBE will be an umbrella designation for DBE, MBE, and WBE). This study compares the difference in responses from these two groups. A total of 333 business enterprises responded to the questionnaire. The survey results showed that construction firms gave significantly higher importance to "financial" issues and "safe work practices" as their most important factors …
Second-Order Perturbation Analysis Of The St. Venant Equations In Relation To Bed-Load Transport And Equilibrium Scour Hole Development, Frans Joseph Lambrechtsen
Second-Order Perturbation Analysis Of The St. Venant Equations In Relation To Bed-Load Transport And Equilibrium Scour Hole Development, Frans Joseph Lambrechtsen
Theses and Dissertations
This analysis is an expansion of research done by Rollin Hotchkiss during his Ph.D work. The research uses fluid flow, sediment transport, and perturbation theory to predict where scour will occur in a variable-width channel. The resulting equations also determine equilibrium scour depth based upon the stream bed elevation derived from a dimensionless bed slope equation. Hotchkiss perturbed the width of the channel using a second order Taylor Series perturbation but neglected second order terms. The present work follows the same procedures as Hotchkiss but maintains the second order terms. The primary purpose is to examine how the additional terms …
Mechanical Properties And High-Temperature Performance Of A Polyester Resin Modified Using Fgd Gypsum, Morteza Janbaz
Mechanical Properties And High-Temperature Performance Of A Polyester Resin Modified Using Fgd Gypsum, Morteza Janbaz
Theses and Dissertations
High-temperature performance of polyester- based construction materials is an important consideration when fire safety is a concern. These materials are typically used as non-structural components of buildings and other structures. Structural retrofits using fiber-reinforced polymer (FRP) composites are also gaining popularity. However, a major disadvantage of polymer- based materials (including FRP composites) is their flammability and toxic gas generation at high temperatures. The main objective of this research effort was to determine the mechanical properties and high-temperature performance of a polyester resin modified with various amounts of an industrial by-product additive. The additive used was Flu-Gas Desulfurization (FGD) gypsum, which …