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Articles 151 - 180 of 406
Full-Text Articles in Civil and Environmental Engineering
Aerodynamic Mitigation Of Roof Suction Using Solar Panels, Laura M. Iverson
Aerodynamic Mitigation Of Roof Suction Using Solar Panels, Laura M. Iverson
LSU Master's Theses
This thesis aims to evaluate the feasibility of solar panels to be used as aerodynamic mitigation devices to reduce roof suction caused by high-speed winds on flat-roof, low-rise buildings. Roof suction is caused by negative pressures resulting in uplift on the roof, due to the wind passing over the sharp edges of the roof. Suction is a common cause of failure for these types of flat-roof, low-rise buildings during extreme wind events such as hurricanes, as the uplift force can cause the roof to separate from the building. A variety of mitigation devices have been proposed in the literature to …
Evaluation Of Self-Healing Of Asphalt Concrete Through Induction Heating And Metallic Fibers, Yashwanth Pamulapati
Evaluation Of Self-Healing Of Asphalt Concrete Through Induction Heating And Metallic Fibers, Yashwanth Pamulapati
LSU Master's Theses
Healing by means of induction heating is promising, however the effectiveness of this technology is yet to be demonstrated due to limited studies on cracking damage and fracture resistance property recoveries after healing. The objective of this study was to test the hypothesis that a new generation of asphaltic materials could be artificially healed while in-service by embedding metallic fibers in the mix and by applying a magnetic field at the surface. To achieve this objective, an open-graded friction course (OGFC) was successfully designed and prepared to incorporate up to 5% steel and aluminum fibers by weight of the mix. …
Effects Of Temperature Segregation On The Denisity And Mechanical Properties Of Asphalt Mixtures, Pranjal Pravin Phaltane
Effects Of Temperature Segregation On The Denisity And Mechanical Properties Of Asphalt Mixtures, Pranjal Pravin Phaltane
LSU Master's Theses
Temperature differentials (TD) between the target laydown and actual laydown temperatures of asphalt paving mixtures have been noticed and measured since the late 1990s. Since then, numerous research studies conducted on the phenomena found inconclusive conclusions regarding the effects of TD on the initial pavement quality and the long-term performance. The objective of this study was to evaluate the effects of different levels of TD on the initial quality and the long-term performance of asphalt pavements by evaluating the core density and laboratory measured performance characteristics, respectively. Through the evaluation, it was also aimed to ascertain and establish allowable TD …
Driver Engagement In Secondary Tasks: Behavioral Analysis And Crash Risk Assessment, Mengqiu Ye
Driver Engagement In Secondary Tasks: Behavioral Analysis And Crash Risk Assessment, Mengqiu Ye
LSU Master's Theses
Distracted driving has long been acknowledged as one of the leading causes of death or injury in roadway crashes. The focus of past research has been mainly on the change in driving performance due to distracted driving. However, only a few studies attempted to predict the type of distraction based on driving performance measures. In addition, past studies have proven that driving performance is influenced by the drivers’ socioeconomic characteristics, while not many studies have attempted to quantify that influence. In essence, this study utilizes the rich SHRP 2 Naturalistic Driving Study (NDS) database to (a) develop a model for …
Identifying High Crash Risk Roadways Through Jerk-Cluster Analysis, Seyedeh Maryam Mousavi
Identifying High Crash Risk Roadways Through Jerk-Cluster Analysis, Seyedeh Maryam Mousavi
LSU Master's Theses
The state-of-the-practice for most municipal traffic agencies seeking to identify high-risk road segments has been to use prior crash history. While historic traffic crash data is recognized to be valuable in improving roadway safety, it relies on prior observation rather than future crash likelihood. Recently, however, researchers are developing predictive crash methods based on “abnormal driving events.” These include abrupt and atypical vehicle movements thought to be indicative of crash avoidance maneuvers and/or near-crashes. Because these types of near-crash events occur far more frequently than actual crashes, it is hypothesized that they can be used as an indicator of high-risk …
Effect Of Heavy Vehicle On Conventional And Joint Work Zone Merges, James Joseph Dillard
Effect Of Heavy Vehicle On Conventional And Joint Work Zone Merges, James Joseph Dillard
LSU Master's Theses
Lane merges in construction work zones are guided by the Manual on Uniform Traffic Control Devices (MUTCD). The MUTCD typical lane closure guides merging vehicles from one lane into another; from the closed lane, where the construction work is taking place into the open lane. The conventional lane merge often creates conflicts for motorists because queues typically form in the open lane and aggressive drivers use this opportunity to drive in the closed lane as far as they can until forced to merge in the open lane. As a result, the conventional lane merge can create differential speeds and queue …
Evaluation Of Louisiana Friction Rating Table By Field Measurements, Yogendra Prasad Subedi
Evaluation Of Louisiana Friction Rating Table By Field Measurements, Yogendra Prasad Subedi
LSU Master's Theses
This study aims to evaluate the current Louisiana Department of Transportation and Development (LADOTD) friction rating table by field measurements and provide recommendations for the frictional mix design guidelines. The current friction rating table is based on the Polished Stone Value (PSV) of coarse aggregate as the only surface friction guideline in a wearing course mixture design, which is only one of many factors that affect the pavement surface friction. To achieve the objective, the pavement surface friction and texture properties were measured using Lock-Wheel Skid Trailer (LWST), Dynamic Friction Tester (DFT) and Circular Track Meter (CTM). Twenty two different …
Driver Response And Safety Effect Of Three-Foot Bicycle Passing Laws, Nelida Andreina Herrera
Driver Response And Safety Effect Of Three-Foot Bicycle Passing Laws, Nelida Andreina Herrera
LSU Master's Theses
The long and tragic history of vehicle-bicycle crashes in the United States has increasingly led to calls for legislative action to provide greater protections for bicyclists on the nation’s roadways. Among the most common of these actions are the three-foot passing laws. Recent history suggests that these laws may contribute to reducing the number of vehicular/bicycle-related collisions as well as their accompanying deaths and injuries, but few, if any, studies have shown how they substantively affect driver behavior. This thesis builds upon the results of recent research quantifying the effects of the three-foot passing laws by comparing key behavioral aspects …
Impact Of Algae On Sugar Mill Effluents: Water Treatment And Added Value Assessment, Jacob Stephen Foy
Impact Of Algae On Sugar Mill Effluents: Water Treatment And Added Value Assessment, Jacob Stephen Foy
LSU Master's Theses
Installations similar to Louisiana sugar mills have been proposed as potential biorefineries for sugarcane, energy cane, and sweet sorghum. The nutrient-rich wastewater generated from the milling process can be used as an algal growth medium. Simultaneously, algae can serve as a water treatment strategy to deplete these effluents of excess nitrogen, phosphorus, and organic carbon. In this research the effluents of a sugar mill were characterized for water quality and nutrient characteristics; the effluents were determined to be suitable for growth of a native Louisiana co-culture of microalgae and cyanobacteria (Chlorella vulgaris/Leptolyngbya sp.); growth rate, biomass productivity and nutrient uptake …
Vibration Control In High-Rise Buildings For Multi-Hazard, Srinivasa Adithya Sailesh Abburu
Vibration Control In High-Rise Buildings For Multi-Hazard, Srinivasa Adithya Sailesh Abburu
LSU Master's Theses
Increasing population and migration of people to cities has led to the construction of high-rise buildings. High-rise buildings have received a renewed interest in many city business locations, where land is scarce, as per their economic, sustainability and other benefits. Taller and taller towers are being built everywhere in the world. However, the increased frequency of multi-hazard disasters makes it challenging to balance between a resilient and sustainable construction. As a saying, ‘with new inventions come new problems’. High-rise buildings usually have issues with increased wind loads brought by, for instance, hurricanes, which can decrease their serviceability and cause failure …
Life Cycle Analysis Of An Airlifted Recirculation Aqualculture Facility, Marlon Alberetos Greensword
Life Cycle Analysis Of An Airlifted Recirculation Aqualculture Facility, Marlon Alberetos Greensword
LSU Master's Theses
Airlift-equipped recirculating aquaculture systems (RAS) provide water-circulation, aeration, and degassing efficiently and reliably. This project investigated the need for biofilters in a fish hatchery environment to address biofouling of tank water from hatching eggs. Eggs of various fish species were selected and Biological Oxygen Demand (BOD), total Kjeldahl nitrogen (TKN), and protein loading and content were measured and compared. Means for all samples were: 0.67±0.05g BOD₅/g, 10.89 nitrogen±0.84% and the mean protein content 69.22±3.82%. A statistical analysis indicates that Rachycentron canadum (cobia) and Ictalurus punctatus (channel catfish) is the most representative of the multi-species lot when compared to Balantiocheilus melanopterus …
A Comparative Analysis Of Roundabouts And Traffic Signals Through A Corridor, Melissa Arrigo Lebas
A Comparative Analysis Of Roundabouts And Traffic Signals Through A Corridor, Melissa Arrigo Lebas
LSU Master's Theses
This thesis presents a case study on an urban arterial corridor consisting of four intersections located in Baton Rouge, Louisiana. The research evaluates alternative roundabout designs in order to improve traffic flow through a currently congested corridor. The objectives of the research were to evaluate the effect of roundabouts in an urban arterial corridor, select the best alternative for the given corridor characteristics, and test the capacity of the alternative roundabout corridors. The three alternatives that were considered as part of this study were the existing signalized corridor, a partial two-lane roundabout corridor, and a partial three-lane roundabout corridor. Field …
Composite 1-Dimensional Modeling Of The Expanded Small Scale Mississippi River Model, Benjamin Joseph Hartman
Composite 1-Dimensional Modeling Of The Expanded Small Scale Mississippi River Model, Benjamin Joseph Hartman
LSU Master's Theses
Stream wise 1-dimensional numerical modelling couples well with long term, large domain physical modelling because of its ability to perform simulations quickly. The downsides are limitations in replicating some complex hydrodynamics and sediment transport behavior. In this study, a 1-dimensional model of a section of the Expanded Small Scale Physical Model (ESSPM) is developed using the USACE HEC-RAS software with a goal of investigating the ability of a 1-dimensional model to accurately replicate hydraulics at ESSPM time scales. Additional simulations are conducted to examine the impact of varying distortion scales, non-frictional energy losses and synthetic sediment on hydraulic behavior. The …
Computer Simulation Of Modern Recirculation Systems And Their Production Strategies, Daniel Alt
Computer Simulation Of Modern Recirculation Systems And Their Production Strategies, Daniel Alt
LSU Master's Theses
Aquaculture has grown to meet the gap created by a growing demand from population growth and a stagnating wild catch. Recirculating aquaculture system (RAS) is a facet of aquaculture developed to allow the culture of fish in closed systems. The fish are able to survive as the various water parameters are kept within safe ranges by engineered systems and rules of operation. Engineers and operators have attempted to improve the efficiencies of these systems to increase their production. These improvements must guarantee the stability of the system for the entire culture cycle of the fish being raised in an RAS. …
Exploration Of The Shrp 2 Naturalistic Driving Study: Development Of A Distracted Driving Prediction Model, Syndney Jenkins
Exploration Of The Shrp 2 Naturalistic Driving Study: Development Of A Distracted Driving Prediction Model, Syndney Jenkins
LSU Master's Theses
The SHRP 2 NDS project was the largest naturalistic driving study ever conducted. The data obtained from the study was released to the researching public in 2014 through the project’s InSight webpage. The objectives of this research were to first explore the massive dataset and determine if it was possible to develop prediction models based on several performance measures that could be used to study driver distraction. Time series data on driver GPS speed, lateral and longitudinal acceleration, throttle position and yaw rate were discovered as five appropriate performance measures available from the NDS that could be used for the …
Effects Of Light Quality And Light Quantity On The Growth Kinetics Of A Louisiana Native Microalgal/Cyanobacterial Co-Culture, Jonathan Zell Barnett
Effects Of Light Quality And Light Quantity On The Growth Kinetics Of A Louisiana Native Microalgal/Cyanobacterial Co-Culture, Jonathan Zell Barnett
LSU Master's Theses
One of the most important factors controlling the growth of microalgae is light. Light quality and light quantity have a dramatic effect on the production of biomass, lipids and pigments of microalgae. In this research, a native Louisiana co-culture containing Chlorella vulgaris (microalgae) and Leptolyngbya sp (cyanobacteria) was studied to determine the effects of various wavelength distributions and irradiance levels on growth kinetics. Growth rates, biomass levels, lipid contents and chlorophyll-a production was examined in batch cultures to determine which color light was optimum for cultivation. At 80 µmol/m^2-sec the species shifted from microalgae dominant to cyanobacteria dominant. The impact …
Characterization Of Biopolymer Using Swcc And Microfluidic Models: Implication On Eor, Jungyeon Jang
Characterization Of Biopolymer Using Swcc And Microfluidic Models: Implication On Eor, Jungyeon Jang
LSU Master's Theses
The objective of this study is to investigate the characteristics of biopolymers and to examine their application for soil stabilization and oil production. Biopolymers, the composite of multi-living organisms, are one of the most promising materials in the field of geotechnical engineering. The application of biopolymer is more efficient than water for soil stabilization and oil production due to its higher viscosity as a fill material of pores in the soil. This thesis begins with a definition of Agar and Polyacrylamide (PAM) as the measurement of viscosity, contact angle, and surface tension. The application of microfluidic models are applied to …
Micro-Encapsulation Of Asphalt Rejuvenators Using Melamine-Formaldehyde, Max Abelardo Aguirre Deras
Micro-Encapsulation Of Asphalt Rejuvenators Using Melamine-Formaldehyde, Max Abelardo Aguirre Deras
LSU Master's Theses
Self-healing microencapsulation in asphalt concrete is an emerging technology that would allow this particular material to resist cracking damage caused by vehicular and environmental loading. The objectives of this study were to evaluate the effect of an asphalt rejuvenator on asphalt binder in reversing the aging process and to develop a synthesis procedure for the production of microencapsulation of asphalt rejuvenators. Production parameters such as agitation rate, heating temperature and EMA concentration were varied to determine the effect on microcapsules properties such as size, shell thickness and morphology. Based on the results of the experimental program, it was concluded that …
Motion Analysis Of Biotin Carboxylase-Driven Robotic Nano-Swimmers, Sima Hannani
Motion Analysis Of Biotin Carboxylase-Driven Robotic Nano-Swimmers, Sima Hannani
LSU Master's Theses
The purpose of this study is to experimentally validate the hypothesis that the enzyme biotin carboxylase (BC) can behave as a bimolecular motor and propel nano-scale particles in fluidic environments. This hypothesis was proposed in the M.S. thesis “Toward the Development of Biotin Carboxylase Driven Robotic Nano-swimmer” by Rachel Yates (Yates, 2012). In (Yates, 2012), the nano-particle (called a nano-swimmer) is a Janus particle with BC molecules attached to one hemisphere. The idea is that in the presence of its substrates (i.e., fuel) BC will cause individual nano-particles to undergo non-Brownian motion by virtue of its conformational change. In order …
Engineering Behavior And Characterization Of Biomass Ashes Using Geotechnical Measurement Techniques, Francisco Javier Grau Sacoto
Engineering Behavior And Characterization Of Biomass Ashes Using Geotechnical Measurement Techniques, Francisco Javier Grau Sacoto
LSU Master's Theses
Biomass, the organic material derived from plants or animals in a biological process, has rapidly become a topic of worldwide interest. The need to find new types of renewable energy sources has led to the use of natural materials as an economic, sustainable and environmental alternative. Biomass can be used to produce biofuel after a conversion process. The combustion of biomass matter –which is mainly produced in industrial plants- becomes biomass ash, which contains macronutrients and micronutrients. Currently, the recycling potential is wasted and most of the biomass ash is dumped without control or just disposed in landfills. The main …
During And After Event Analysis Of Cell Phone Talking And Texting-A Driving Simulator Study, Raju Thapa
During And After Event Analysis Of Cell Phone Talking And Texting-A Driving Simulator Study, Raju Thapa
LSU Master's Theses
A number of studies have been done in the field of driver distraction, specifically on the use of cell phone for either conversation or texting while driving. However, till now, researchers have focused on the driving performance of drivers when they were actually engaged in the task, i.e. during the texting or phone conversation event. The primary objective of this study is to analyze the post event effect of cell phone usage in order to verify whether the distracting effect lingers on after the actual event had ceased. The research utilizes a driving simulator study of thirty-six participants to test …
Method For Synchrotron X-Ray Computed Tomographic Imaging Of Biofilms In Porous Media, Corey Matthew Klibert
Method For Synchrotron X-Ray Computed Tomographic Imaging Of Biofilms In Porous Media, Corey Matthew Klibert
LSU Master's Theses
Modeling of biofilms in porous media at pore scale resolution has been hindered by the lack of available experimental techniques to non-destructively image biofilm structure at these resolutions. Researchers have relied upon simulation rather than experimentation to produce pore-scale biofilm models, using simplifying assumptions governing microbial growth such as Monod kinetics and random biofilm seeding locations to generate biofilms in simulated environments. This study investigated the use of absorption-edge synchrotron X-ray computed microtomography (SXCMT) in combination with a contrast agent, Lugol’s iodine solution (10% KI/5% I2), to nondestructively obtain three-dimensional images of biofilms at pore-scale resolution. The study examined and …
Integrating Recycled Glass Cullet In Asphalt Roof Shingles To Mitigate Heat Island Effect, Micah Kiletico
Integrating Recycled Glass Cullet In Asphalt Roof Shingles To Mitigate Heat Island Effect, Micah Kiletico
LSU Master's Theses
As an approach to mitigate the harmful effects of Urban Heat Island (UHI), the use of glass cullet in the production of asphalt roof shingles has the potential to be employed as a cool roof strategy. The objective of this study was to test the hypothesis that the use of recycled glass increases solar reflectance index (SRI) without affecting the performance of asphalt roof shingles. In order to evaluate the feasibility of recycled glass for alternative uses, the engineering properties of glass cullet were investigated and compared to conventional aggregates used in the production of asphalt roof shingles. Laboratory samples …
Pah Degradation In Wetland Soils As Influenced By Redox Potential, Haoxuan Zhang
Pah Degradation In Wetland Soils As Influenced By Redox Potential, Haoxuan Zhang
LSU Master's Theses
Polycyclic aromatic hydrocarbons (PAHs) are a common contaminant in wetland soils. They are a group of compounds widely distributed in the environment and tend to accumulate in soils. Major contribution to removal of PAHs is biological degradation. For investigating the biodegradation potential of PAHs influenced by tidal actions, equipment was built for simulating the tidal actions, and concentrations of phenanthrene, pyrene, and benzo[e]pyrene were added to the soils samples which were collected from wetland. Experiments were then conducted over 120 days. Redox potentials and PAHs concentrations were measured and analyzed. Results are concluded: 1) influenced by tidal action, phenanthrene, pyrene, …
Analysis Of Data Selection And Inclusion For Highway Safety Manual Model Calibration, Bridget Scheyd Robicheaux
Analysis Of Data Selection And Inclusion For Highway Safety Manual Model Calibration, Bridget Scheyd Robicheaux
LSU Master's Theses
The application of the American Association of State Highway and Transportation Officials’ (AASHTO) Highway Safety Manual (HSM) to Louisiana roads is a key component to the Louisiana Department of Transportation and Development’s (LA DOTD) plan to improve safety on state highways and reach the goal of “Destination Zero Deaths.” To apply the HSM the research sought to develop state-specific HSM calibration factors for eight facility types. During the development process, the data-intensive computational procedure followed to compute the calibration factors revealed numerous issues associated with the inclusion and definitions of various data elements required by the HSM. These included coding …
Mechanical Behavior Of Frp-Confined Self-Healing Concrete, Yueqiang Sui
Mechanical Behavior Of Frp-Confined Self-Healing Concrete, Yueqiang Sui
LSU Master's Theses
This research study is motivated by the need to reduce the costs of maintenance and repair of the aging transportation infrastructure in the US. The proposed approach is to use self-healing concrete. The objective of this study is to test the hypothesis that composite action due to fiber reinforced polymer (FRP) confinement of cylindrical concrete specimens may improve the self-repairing properties of self-healing concrete materials. Sodium silicate (Na2SiO3) is utilized as healing agent in this research. Concrete cylinders with 0.0%, 1.0%, 2.5%, and 5.0% of sodium silicate (SS) by weight of cement were cast and tested to evaluate the effectiveness …
Framework Development For A Performance-Based Specifications For Asphaltic Concrete Pavements, Harshavardhan Challa
Framework Development For A Performance-Based Specifications For Asphaltic Concrete Pavements, Harshavardhan Challa
LSU Master's Theses
The objective of this study was to develop a framework for performance-based specifications (PBS) which rely on the fundamental mechanistic asphalt mixture properties as performance predictors, verified to actual field performance, to compliment current QC/QA specifications for Louisiana. Nine asphalt paving projects were selected across the state with a total of 14 pavement sections that included 21 asphalt mixtures. A suite of laboratory tests using the Hamburg loaded-wheel tracking (LWT) test and the Semi-Circular Bending (SCB) were performed to evaluate the rutting and cracking resistance, respectively. In addition, the Indirect tensile dynamic modulus test (IDT E*) was conducted to evaluate …
Laboratory Evaluation Of Asphalt Mixtures And Binders With Reclaimed Asphalt Shingle Prepared Using The Wet Process, Alejandro Jose Alvergue
Laboratory Evaluation Of Asphalt Mixtures And Binders With Reclaimed Asphalt Shingle Prepared Using The Wet Process, Alejandro Jose Alvergue
LSU Master's Theses
The objective of this study is to conduct a laboratory evaluation of asphalt mixtures and binders containing RAS prepared using the newly-developed wet process. In the proposed wet process, RAS material is blended with the binder at high temperature prior to mixing with the aggregates. The proposed wet process offers the potential to better control the Superpave Performance Grade (PG) of the binder blend, to stimulate chemical and physical interactions taking place in the blend between asphalt binder in shingles and virgin asphalt binder in the mix, and to reduce maintenance issues at the plant due to the high content …
Effect Of Different Alarm Interfaces On Controller Response, Aritra Datta
Effect Of Different Alarm Interfaces On Controller Response, Aritra Datta
LSU Master's Theses
Pipelines transport millions of barrels of petroleum products every day. Oil and gas pipelines have become important assets of the economic development of almost any country. Government regulations or internal policies regulate the safety of the assets for the population and environment where these pipelines run. Various strategies and technologies have been introduced for monitoring pipelines, but the most common technology to protect pipelines from occasional hazardous incidents is Computational Pipeline Monitoring (CPM). This technique collects and gathers information from the field related to pressures, flows, and temperatures to estimate the hydraulic behavior of the product being transported. Using the …
A Sustainable Remediation Approach For Complete Destruction Of Chloroethanes In Groundwater, Michael Joseph Cheatham
A Sustainable Remediation Approach For Complete Destruction Of Chloroethanes In Groundwater, Michael Joseph Cheatham
LSU Master's Theses
An up-flow column study was operated in a greenhouse composed of a sand/peat mixed media to investigate the effectiveness of an aerobic zone on the disappearances of chloroethane. The oxygen was supplied by mean of porous Silastic tubing under pressure with a breathing air gas cylinder. Chloroethane was generated via reductive dechlorination of 1,1,1-trichloroethane (TCA) and 1,1-dichloroethane (DCA) in anaerobic bioreactors (ABRs). The columns study was conducted with two duplicate reactors (operated in parallel) that underwent separate perturbations of breathing air introduction. Aqueous samples were collected in 160 mL microcosm bottles and analyzed on a GC equipped with a Flame …