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Articles 1 - 30 of 33
Full-Text Articles in Engineering
Effects Of Recycled Asphalt Shingle On The Rheological And Molecular Composition Properties Of Asphalt Cement, Saman Salari
Effects Of Recycled Asphalt Shingle On The Rheological And Molecular Composition Properties Of Asphalt Cement, Saman Salari
LSU Master's Theses
Recycling of asphalt shingles in flexible pavements has received interests in recent years due to economic, environmental, and social reasons. The objective of this study is to introduce a new approach to recycle asphalt shingles in asphalt paving construction in which RAS is ground to ultra-fine sizes and blended with asphalt binder through a wet process. In this method, the ground recycled material is blended with the binder at high temperature prior to mixing with the aggregates. Two unmodified binders that are classified as PG64-22 and PG52-28 were blended with two contrasting sources of RAS, originating from tear-off and manufacturer …
The Effects Of Lean Intervention (5s) On Perceived Musculoskeletal Workload And Perceived Hazardous Working Conditions In A Health Center Pharmacy, Jastinder Singh Dhindsa
The Effects Of Lean Intervention (5s) On Perceived Musculoskeletal Workload And Perceived Hazardous Working Conditions In A Health Center Pharmacy, Jastinder Singh Dhindsa
LSU Master's Theses
The healthcare industry involves a significant level of health and safety risks in various work processes, and healthcare professionals are at risk for work-related musculoskeletal disorders and other health problems. In recent years, Lean has been introduced in healthcare with the goal of eliminating waste and improving efficiency. Lean is also believed to affect the health and safety of workers. The present research studies the effects of Lean (5S) implementation in an acute care pharmacy of a health center. A version of the Dutch Musculoskeletal Questionnaire (DMQ) was used to record the perceived musculoskeletal workload and perceived hazardous working conditions. …
Global And Local Performance Of Prestressed Girder Bridges With Positive Moment Continuity Detail, Tanvir Hossain
Global And Local Performance Of Prestressed Girder Bridges With Positive Moment Continuity Detail, Tanvir Hossain
LSU Doctoral Dissertations
Global as well as local behavior of prestressed girder bridges made continuous by adding continuity diaphragms with a recently proposed positive moment continuity detail were investigated in this study. The focus of the investigation is on the positive moment caused by temperature gradients, time dependent effects such as creep and shrinkage, and some live load positions, and on the force transfer mechanisms through the diaphragm. The study utilized different approaches including analytical models for temperature evaluations and finite element models for structural assessments. Field data from a bridge using the new detail were used to validate the developed models. The …
The Use Of A Mixed Chlorella Cyanobacteria Culture As A Protein Source For Aquaculture, Marjan Sadat Mohtashamian
The Use Of A Mixed Chlorella Cyanobacteria Culture As A Protein Source For Aquaculture, Marjan Sadat Mohtashamian
LSU Master's Theses
The increase in the global demand for fish feed in the last decades has resulted in the over exploitation of natural resources to produce more fishmeal supplies for aquaculture industry. The supply issues and high prices of fishmeal products have raised the incentives to seek for suitable alternatives to replace fishmeal protein. As a by-product of biofuel production process, residual microalgal biomass may be a low cost feed ingredient to the aquaculture diet. The potential of the use of a post lipid extraction Chlorella vulgaris/Leptolyngbya sp. Co-Culture (Louisiana co-culture) as a protein source in aquaculture feeds could help offset fishmeal. …
Growth Rate And Productivity Of A Louisiana Native Microalgae/Cyanobacteria Co-Culture: Feasibility For Use In Industrial Biotechnology Applications, Athens Gomes Silaban
Growth Rate And Productivity Of A Louisiana Native Microalgae/Cyanobacteria Co-Culture: Feasibility For Use In Industrial Biotechnology Applications, Athens Gomes Silaban
LSU Master's Theses
Interest in biofuels research has increased in the era of uncertainty of the current fossil fuel sustainability and global climate concerns. Microalgae offer advantages over terrestrial plants as a potential source of biomass-based fuel. In this study, a Louisiana native microalgae/cyanobacteria (Chlorella vulgaris/Leptolyngbya sp.) co-culture was examined to provide foundational information of its growth conditions. Batch studies were conducted to determine optimum nitrogen and irradiance level that yields maximum co-culture biomass growth and productivity under aerated and non-aerated conditions. The optimum nitrogen level was 2.94 mM N and the optimum initial scalar irradiance range was between 400 – 800 µmol …
Frp Stiffener Efficiency Coefficient For Sbs Shear Strengthening Applications, Hamed Babaizadehroshanfekr
Frp Stiffener Efficiency Coefficient For Sbs Shear Strengthening Applications, Hamed Babaizadehroshanfekr
LSU Master's Theses
The use of composite materials such as Fiber Reinforced Polymer (FRP) to strengthen concrete structures has surged during the past two decades as an alternative for conventional methods of structural strengthening and repair. FRP materials are light and relatively easy to install. They are noncorrosive, durable and less vulnerable to environmental conditions in comparison to other construction and retrofitting materials. The knowledge and applications of composites for strengthening steel structures are relatively smaller when compared to concrete strengthening applications. Strengthening-By-Stiffening (SBS) is a new strengthening alternative that was developed at Louisiana State University. SBS has proven to be a practical …
Reductive Dechlorination Of High Concentrations Of 1,2-Dichloroethane, 1,2-Dichloropropane, And 1,1,2-Trichloroethane By Dehalogenimonas Sp., Andrew D. Maness
Reductive Dechlorination Of High Concentrations Of 1,2-Dichloroethane, 1,2-Dichloropropane, And 1,1,2-Trichloroethane By Dehalogenimonas Sp., Andrew D. Maness
LSU Master's Theses
The research goals presented here were to evaluate the solvent concentrations over which Dehalogenimonas lykanthroporepellens strain BL-DC-9T and Dehalogenimonas sp. IP3-3 are able to reductively dechlorinate 1,2-dichloroethane (1,2-DCA), 1,2-dichloropropane (1,2-DCP), and 1,1,2-trichloroethane (1,1,2-TCA). Both of these novel bacteria were isolated from contaminated groundwater at the PetroProcessors of Louisiana, Inc. Superfund site located near Baton Rouge. Both cluster in the phylum Chloroflexi, related to, but distinct from, the widely studied, reductively dechlorinating “Dehalococcoides” strains .
Although previous research demonstrated that strains BL-DC-9T and IP3-3 are able to reductively dechlorinate a variety of polyhalogenated alkanes, the solvent concentration at which the strains …
Thermal Stress Analysis Of Jointed Plain Concrete Pavements Containing Fly Ash And Slag, Yoonseok Chung
Thermal Stress Analysis Of Jointed Plain Concrete Pavements Containing Fly Ash And Slag, Yoonseok Chung
LSU Doctoral Dissertations
With the current demand for Portland cement concrete (PCC) sustainability, supplementary cementitious materials (SCMs) are used in concrete mixtures. The SCMs positively impact the environmental and economic aspects of concrete mixtures and improve the mixture properties in both fresh and hardened concrete. In this research, one control and twenty-four ternary mixtures, with various combinations of fly ashes (Class C and F), slags (Grade 100 and 120), and Portland cement were fabricated. The thermal properties (coefficient of thermal expansion (CTE), thermal conductivity, and heat capacity) and mechanical properties of the selected ternary mixtures were measured at various ages. Temperature gradients were …
Continuum And Crystal Strain Gradient Plasticity With Energetic And Dissipative Length Scales, Danial Faghihi Shahrestani
Continuum And Crystal Strain Gradient Plasticity With Energetic And Dissipative Length Scales, Danial Faghihi Shahrestani
LSU Doctoral Dissertations
This work, standing as an attempt to understand and mathematically model the small scale materials thermal and mechanical responses by the aid of Materials Science fundamentals, Continuum Solid Mechanics, Misro-scale experimental observations, and Numerical methods. Since conventional continuum plasticity and heat transfer theories, based on the local thermodynamic equilibrium, do not account for the microstructural characteristics of materials, they cannot be used to adequately address the observed mechanical and thermal response of the micro-scale metallic structures. Some of these cases, which are considered in this dissertation, include the dependency of thin films strength on the width of the sample and …
Development Of Hydrograph-Based Approach To Modeling Fate And Transport Of Sediment-Borne Bacteria In Lowland Rivers, Bhuban Ghimire
Development Of Hydrograph-Based Approach To Modeling Fate And Transport Of Sediment-Borne Bacteria In Lowland Rivers, Bhuban Ghimire
LSU Doctoral Dissertations
Fecal pollution is one of the major factors responsible for water quality impairments of rivers and streams, particularly organic-rich fine-grained lowland streams. While predicting fecal pollution is generally required in the development of water quality restoration plans like Total Maximum Daily Loads, no single model has been widely recognized as an efficient and effective tool for estimating fecal pollution. This dissertation develops a simple yet effective modeling approach, called Hydrograph-based Approach, to bacterial fate and transport modeling in lowland rivers. The new hydrograph-based approach is simple and efficient in terms of its less data requirements as compared with other models. …
Factors Controlling Macondo Oil Biodegraqdation On A Rapidly Eroding Coastal Headlands Beach, Marilany G. Urbano
Factors Controlling Macondo Oil Biodegraqdation On A Rapidly Eroding Coastal Headlands Beach, Marilany G. Urbano
LSU Master's Theses
Fourchon Beach, located along the southeast Louisiana coast, was affected by the oil leaking from the British Petroleum’s Deepwater Horizon Oil rig explosion in 2010. The oil, labeled MC252 oil, came ashore in a stable emulsion form, contaminating the sand, salt pan, marsh and mangroves along the beach. A unique oil form, labeled SSRB (small surface residue ball) was formed from the MC252 oil and a combination of environmental factors. The SSRB is an aggregate of sand and emulsified oil, and forms a large portion of the oil still present on the supratidal zone of Fourchon Beach. SSRBs have not …
Numerical Study Of Laterally Loaded Batter Pile Groups With The Application Of Anisotropic Modified Cam-Clay Model, Yida Zhang
LSU Master's Theses
This study presents a series of numerical studies of laterally loaded batter pile groups based on data of the full-scale lateral load test on M19 eastbound pier foundation of the new I-10 Twin Span Bridge, Louisiana. The numerical studies include several continuum-based 3D finite element analyses on batter/vertical pile/pile groups and a FB-MultiPier analysis of the pile foundation. The Anisotropic Modified Cam Clay Model, has been implemented into UMAT and applied for describing clay behavior in all FE models. The explicit substepping scheme with modified Euler algorithm is selected to implement the model in ABAQUS software. The resultant UMAT shows …
Field Investigation Of Wave And Surge Attenuation In Salt Marsh Vegetation And Wave Climate In A Shallow Estuary, Ranjit S. Jadhav
Field Investigation Of Wave And Surge Attenuation In Salt Marsh Vegetation And Wave Climate In A Shallow Estuary, Ranjit S. Jadhav
LSU Doctoral Dissertations
This research investigates and quantifies the effectiveness of salt marsh vegetation in reducing storm-induced waves and surge, and the potential for wetland erosion due to wave action, using field measurements on the Louisiana coast. To quantify wave attenuation and wave energy dissipation by vegetation (Spartina alterniflora), wave data were measured along a transect using pressure transducers during two tropical storms. Measurements showed that incident waves attenuated exponentially over the vegetation. The linear spatial wave height reduction rate increased from 1.5% to 4% /m as incident wave height decreased. The bulk drag coefficient estimated from the field measurements decreased with increasing …
Shear Strength Evaluation Of An Erosional Soil System At Fourchon Beach, Jacques Pierre Boudreaux
Shear Strength Evaluation Of An Erosional Soil System At Fourchon Beach, Jacques Pierre Boudreaux
LSU Master's Theses
South Louisiana is vanishing. Subsidence due to relative sea level rise with erosion of weak wetland soils together produce devastating rates of land loss for this area. It is believed that high rates of erosion are due to weak strength properties of fine-grained sediments in the beaches, marshes, and other wetlands in coastal Louisiana. Wave action is known to initiate the movement of weak coastal soils in a manner that is related to the difference between the shear stresses applied by waves and the critical shear strength of erosional sediments. Direct shear tests were performed on samples obtained from the …
Determining The Performance Of Breakwaters During High Energy Events: A Case Study Of The Holly Beach Breakwater System, Andrew Keane Woodroof
Determining The Performance Of Breakwaters During High Energy Events: A Case Study Of The Holly Beach Breakwater System, Andrew Keane Woodroof
LSU Master's Theses
Breakwaters have been constructed in many areas along Louisiana’s coastline to protect the shoreline from wave energy and erosion. During normal conditions, these breakwaters can typically be analyzed using traditional empirical methods for emergent breakwaters. However, Louisiana’s coastline is under constant threat from tropical storms and hurricanes, during which breakwaters can frequently become overtopped or submerged systems. Recent studies show that the type of shoreline response to a breakwater system may vary depending on the crest height of the breakwater in relation to the mean water level. Though emergent breakwaters typically induce sediment accretion along the shoreline, studies using laboratory …
Stabilization Of Very Weak Subgrade Soil With Cementitious Stabilizers, Sanjay Kumar Dhakal
Stabilization Of Very Weak Subgrade Soil With Cementitious Stabilizers, Sanjay Kumar Dhakal
LSU Master's Theses
To evaluate the effect of high moisture content on the performance of weak subgrade soil and improve the engineering properties of weak subgrade soil through using cementitious materials, five different soils that represent range of subgrade soil in Louisiana (based on plasticity indices) were collected and considered in this research study. All tests on raw soils and treated/stabilized soils were performed on the soil laboratory at the Louisiana Transportation Research Center (LTRC). Ordinary Portland cement and hydrated lime were selected in this study to treat/stabilize the subgrade soils depending upon the soil type and plasticity index. The repeated load triaxial …
Fundamental Characterization Of Asphalt Mixtures: Warm Mix Asphalt Technologies In Flexible Pavement Systems, Bhanu Vijay Vallabhu
Fundamental Characterization Of Asphalt Mixtures: Warm Mix Asphalt Technologies In Flexible Pavement Systems, Bhanu Vijay Vallabhu
LSU Master's Theses
Increasing concerns on environment and greenhouse effect, coupled with increased construction prices led to the development of new technologies by the Asphalt industry to produce Asphalt Concrete (AC) pavements. Extensive research is being done to evaluate the impact and performance of these new technologies. Warm Mix Asphalt (WMA) is one of these technologies that allow mixing, production, placing and compaction of asphalt mixes at significantly lower temperatures as compared to the traditional Hot Mix Asphalt (HMA) practice. Lower temperatures result in reduced fuel usage, fume exhausts, greenhouse gas emissions, wear and tear at plants; while enhancing worker health and safety …
The Impact Of 5s On The Safety Climate Of Manufacturing Workers, Siddarth Srinivasan
The Impact Of 5s On The Safety Climate Of Manufacturing Workers, Siddarth Srinivasan
LSU Master's Theses
The occupational injury rate in the manufacturing sector is higher than the average of all private industries, necessitating safety studies. Occupational safety can be measured through different approaches. Safety climate, a predictive measure of safety, studies the workers’ perceptions of safety of the workplace. This measure includes several dimensions of safety like management commitment, involvement and work place hazard evaluation and was chosen as a method of evaluation in this study. Even though occupational safety is an important concern, management often prioritizes reducing waste and cost. So, there is a necessity for some technique which reduces waste and simultaneously improves …
Synthesis And Characterization Of Geopolymers For Infrastructural Applications, Jian He
Synthesis And Characterization Of Geopolymers For Infrastructural Applications, Jian He
LSU Doctoral Dissertations
In this study, the synthesis process, composition, and microstructure as well as mechanical properties of geopolymers generated by 3 different kinds of raw materials (i.e., metakaolin, mixture of red mud and fly ash, mixture of red mud and rice husk ash) was explored. For geopolymers from identical raw materials, variable parameters involved in the synthesis were examined to investigate the extent and degree of geopolymerization. Uniaxial compression testing was used to examine the mechanical properties (i.e. compressive strength, stiffness, and failure strain). Then the composition and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) as well …
Optimal Production And Delivery Scheduling Models For A Supply Chain System Of Deteriorating Items, Bingqing Wu
Optimal Production And Delivery Scheduling Models For A Supply Chain System Of Deteriorating Items, Bingqing Wu
LSU Master's Theses
The market is varying from minute to minute nowadays. Increase cooperation and pursue the optimal interest of the integrated supply chain become a more effective way than act alone in the competition. In this research, an integrated inventory policy between singleproducer and multi-buyer is developed and two inventory models are built. The first model extends the research of Lin and Lin (2007) by changing the single-buyer system to the multibuyers one. Both backorder of buyers and deteriorating items of each party (producer’s level, buyers’ level, and during transport) are considered herein. The second model is based on the research of …
Dynamic Route Choice In Hurricane Evacuation, Meisam Akbarzadeh
Dynamic Route Choice In Hurricane Evacuation, Meisam Akbarzadeh
LSU Doctoral Dissertations
In this research a framework is developed for modeling route choice in hurricane evacuation. Two behavioral hypotheses are evaluated which together with the route choice model, constitute the contributions of the research. The first hypothesis states that beside congestion, other variables such as familiarity with the route, availability of fuel and shelter, facility class, and length of route have an effect on an evacuees' route choice. The second hypothesis states that as time passes and storm conditions change, the impact each variable has on route choice changes. The logit structure was used for modeling the choice process and stated choice …
Biofiltration For Treatment Of Gases Contaminanted By Beta-Caryophyllene, Weili Hu
Biofiltration For Treatment Of Gases Contaminanted By Beta-Caryophyllene, Weili Hu
LSU Master's Theses
Fixed-film biological treatment processes, commonly referred to as biofilters, have been applied to successfully treat a wide variety of volatile organic compounds (VOCs) present in air emitted by a wide variety of industrial operations. The ability of biofilters to treat some classes of VOCs, however, has not been well established. In particular, the performance of biofilters treating sesquiterpenes has not been widely studied. In the research described herein, a laboratory-scale biofilter was operated to treat a synthetic waste gas stream containing â-caryophyllene, a sesquiterpene emitted by conifer trees and industrial wood processing operations. An enrichment culture developed in an initial …
Efficient Finite Element Modeling Of Reinforced Concrete Columns Confined With Fiber Reinforced Polymers, Dan Hu
LSU Master's Theses
Fiber reinforced polymer (FRP) composites have found extensive applications in the field of Civil Engineering due to their advantageous properties such as high strength-to-weight ratio and high corrosion resistance. This study presents a simple and efficient frame finite element (FE) able to accurately estimate the load-carrying capacity and ductility of reinforced concrete (RC) circular columns confined with externally bonded fiber reinforced polymer (FRP) plates and/or sheets. The proposed FE considers distributed plasticity with fiber-discretization of the cross-sections in the context of a force-based (FB) formulation. The element is able to model collapse due to concrete crushing, reinforcement steel yielding, and …
The Biomechanics Of Salt Marsh Vegetation Applied To Wave And Surge Attenuation, James Chatagnier
The Biomechanics Of Salt Marsh Vegetation Applied To Wave And Surge Attenuation, James Chatagnier
LSU Master's Theses
The Northern coast of the Gulf of Mexico is threatened by storm surge and waves from tropical storms. It has been long known that marsh vegetation attenuates storm surge and waves and is vital for sustaining marsh edges. However, little is known about the relationship between plant properties and the amount of storm surge and wave reduction the plants provide. In order to better understand the stiffness properties and physical dimensions of saltmarsh vegetation, which are directly related to their ability to attenuate waves and storm surge, this study has been conducted. Stiffness of salt marsh vegetation was determined through …
Thermal Field Investigations And Applications To Integral Abutment Bridges With Frp Panels, Bo Kong
Thermal Field Investigations And Applications To Integral Abutment Bridges With Frp Panels, Bo Kong
LSU Doctoral Dissertations
Expansion joints are often considered as one of the most vulnerable elements affecting the sustainability of traditional jointed bridges. Over the past several decades, a new type of integral abutment bridge (IAB) has been proposed, where the joints are eliminated at the abutments and/or along the length of the bridges. Although with wide acceptances, the IABs have not been largely applied in practice. Many arguments are unsettled and there are no national design guidelines currently. Among all, the thermal behavior is one of the most concerned issues, and that, to a large extent, limits the maximum length of IABs that …
Laboratory Evaluation Of Geosynthetics To Stabilize/Reinforce The Subgrade/Base In Unpaved Roadways, Imran Akond
Laboratory Evaluation Of Geosynthetics To Stabilize/Reinforce The Subgrade/Base In Unpaved Roadways, Imran Akond
LSU Master's Theses
This research study evaluates the performance of geosynthetic material for subgrade stabilization and base reinforcement of unpaved test sections. For this purpose, extensive large-scale in-box static plate load tests were conducted on several unreinforced and geosynthetic reinforced, unpaved test sections. This research was conducted in Geotechnical Engineering Research Laboratory (GERL) at Louisiana Transportation Research Center (LTRC). The in-box static plate load tests (ASTM D1196-93) were conducted to evaluate the performance and benefits of geosynthetic material for subgrade stabilization/base reinforcement. A total of forty-seven tests were performed in this regard. The quality control of the section was maintained using non-destructive in-situ …
Fatigue Performance Of Existing Bridges Under Dynamic Loads From Winds And Vehicles, Wei Zhang
Fatigue Performance Of Existing Bridges Under Dynamic Loads From Winds And Vehicles, Wei Zhang
LSU Doctoral Dissertations
During the life cycle of bridges, varied amplitude of stress ranges on structural details are induced by the random traffic and wind loads. The progressive deteriorated road surface conditions might accelerate the fatigue damage accumulations. Micro-cracks in structural details might be initiated. An effective structural modeling scheme and a reasonable fatigue damage accumulation rule are essential for stress range acquisitions and fatigue life estimation. The present research targets at the development of a fatigue life and reliability prediction methodology for existing steel bridges under real wind and traffic environment with the capability of including multiple random parameters and variables in …
Impact Of Lean Production On Workers' Exposure To Risk In Modular Home Building Manufacturing, Joel James
Impact Of Lean Production On Workers' Exposure To Risk In Modular Home Building Manufacturing, Joel James
LSU Master's Theses
The construction industry records the highest number of work-related injuries and fatalities in the United States according to the Bureau of Labor Statistics. Workers’ exposure to risk may be affected by implementing Lean concepts. This study describes the effects on worker’s safety environment after a Kaizen event, a Lean tool, conducted in three workstations within a modular home manufacturer: base-framing, sheet-rock hanging, and painting. The effects of Lean on safety hazards at each of the three workstations were determined by conducting a Job Safety Analysis (JSA) before and after each Kaizen. Based on the JSAs a risk assessment tool (questionnaire) …
Microencapsulation Of Self-Healing Concrete Properties, James Gilford Iii
Microencapsulation Of Self-Healing Concrete Properties, James Gilford Iii
LSU Master's Theses
ABSTRACT Recent studies in the literature have demonstrated the ability of self-healing processes to be effective in enhancing the overall life of concrete. The main goal of this project is to evaluate and to control specific parameters for the production of an effective self-healing matrix that can be utilized within the application of self-healing concrete. Therefore, the project objective is to synthesize microcapsules using dicyclopentadine and sodium silicate and to evaluate the effects of pH, temperature, and agitation rate on microcapsule morphology. The microcapsule diameter, yield analysis, and shell thickness were characterized using scanning electron microscopy. During the experimental analysis, …
An Intelligent Computational Approach To The Optimization Of Inventory Policies For Single Company, Qinglin Duan
An Intelligent Computational Approach To The Optimization Of Inventory Policies For Single Company, Qinglin Duan
LSU Master's Theses
This study develops and tests a computational approach for determining optimal inventory policies for single company. The computational approach generally comprises of two major components: a meta-heuristic optimizer and an event-driven inventory evaluation module. Meta-heuristic is a powerful search technique, under the intelligent computational paradigm. The approach is capable of determining optimal inventory policy under various demand patterns regardless their distribution for a variety of inventory items. Two prototypes of perishability are considered: (1) sudden deaths due to disasters and (2) outdating due to expirations. Since every theoretical model is specially designed for a certain type of inventory problem while …