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Articles 841 - 870 of 890
Full-Text Articles in Engineering
Development Of Models And Solution Methods For Different Drayage Applications, Samaneh Shiri
Development Of Models And Solution Methods For Different Drayage Applications, Samaneh Shiri
Theses and Dissertations
In the last decades, intermodal freight transport is becoming more attractive in the global supply chains and freight transport policy makings. Intermodal freight transport provides a cost-effective, reliable, and efficient movement of freight by utilizing the strengths of different transport modes. The initial and final segment of intermodal freight transport, performed by truck, is known as “drayage.” The scheduling of truck movements in drayage operation within the service area of an intermodal terminal is an operational problem which leads to a truck scheduling problem that determines the efficient schedule of trucks while satisfying all transportation demands and constraints. Drayage accounts …
Computations Of The Dynamic Fracture Of Plane Structures By The Extended Finite Element Method, Iman Asareh
Computations Of The Dynamic Fracture Of Plane Structures By The Extended Finite Element Method, Iman Asareh
Theses and Dissertations
Finite element methods for the simulation of dynamic fracture in plane structures are presented. The method is a modified extended finite element method (XFEM) for dynamic fracture simulations with a new methodology to construct the XFEM basis functions for discontinuities. In contrast to conventional XFEM in which the extended interpolation is defined to only capture the discontinuities, the proposed method describes the enrichment functions so that they reproduce both the discontinuities and the polynomial bases of sufficiently high order which are critical for finite element convergence. Such enrichment functions, by adopting the Duffy’s transformation, can be simply defined in terms …
Acoustic Emission Detection In 304h Stainless Steel Due To Intergranular Stress Corrosion Cracking, Joseph W. Hill
Acoustic Emission Detection In 304h Stainless Steel Due To Intergranular Stress Corrosion Cracking, Joseph W. Hill
Theses and Dissertations
Storage of spent nuclear fuel has become problematic in past decades due to delayed completion of long-term repositories for various reasons. Temporary storage containers called Dry Cask Storage Systems (DCSS) made of stainless-steel and surrounded by reinforced concrete have been in use but are exceeding their designed usage periods. Defects in canisters can be exacerbated in climates susceptible to high humidity and salinity levels. As inspection and relicensing of DCSS increases, more efficient monitoring techniques could save nuclear facilities valuable time and resources. Crack detection of the canister walls or welds in real time may be possible utilizing acoustic emission …
Understanding Geopolymerization Process For Enhancement Of Mechanical Properties Of Fly Ash Based-Geopolymer Concrete, Lateef Najeh Assi
Understanding Geopolymerization Process For Enhancement Of Mechanical Properties Of Fly Ash Based-Geopolymer Concrete, Lateef Najeh Assi
Theses and Dissertations
Concrete is a major construction material that is largely made up of cement. Unfortunately, the manufacturing process for the cement currently used to produce concrete releases a great deal of CO2, which endangers the environment. Hence, finding alternatives to ordinary Portland cement is of extreme importance. The intellectual contribution of this dissertation is the development of an improved understanding of the geopolymerization process so that the compressive strength of cement can be maximized while the need for external heating is minimized. The intent is to create a substance to replace commonly used cement without sacrificing other beneficial properties. The first …
Stormwater Capture In The Built Watershed: Fostering Public Awareness Of Water Conservation Through A Parcel-Level Approach To Stormwater Management, Benjamin Rigby
Pitzer Senior Theses
As California contends with climate change and more extreme cycles of drought and deluge, water management agencies and conservation groups are looking towards solutions to the decreasing reliability of imported water supplies. Stormwater has historically been perceived as a threat to development but when captured properly, it presents a resource that can augment local water supplies. Solutions to water supply issues in California have traditionally employed technical and centrally controlled methods for importing water, but there is a growing understanding that parcel-level capture through vegetated swales presents an opportunity for reducing the impact that development has on California’s hydrology. Vegetated …
Evaluation Of Orthophosphate Based Corrosion Inhibitors In Treated Water For El Paso Region, Francisco Solis Jr
Evaluation Of Orthophosphate Based Corrosion Inhibitors In Treated Water For El Paso Region, Francisco Solis Jr
Open Access Theses & Dissertations
Corrosion is an electrochemical phenomenon that involves the deterioration of a metal by the reaction of itself with its surrounding environment. One of the greatest issues for water utilities around the country is to keep the water quality safe. Corrosion can affect the quality of the water that we use on a daily basis by adding a bad taste, increasing the concentration of heavy metals, and allowing outside contaminants to enter the distribution system. The use of phosphate based corrosion inhibitors was tested in two different metals: iron and copper. The phosphate in the inhibitors react with the calcium in …
Investigating Early Age Behavior Of Portland Cement Concrete In Arid Regions, Evan Wolf
Investigating Early Age Behavior Of Portland Cement Concrete In Arid Regions, Evan Wolf
Open Access Theses & Dissertations
The early-age behavior and properties of portland cement concrete change rapidly over time as a result of the hydration process. Comprised of a series of chemical reactions, this process accelerates nonlinearly with the curing temperature. Gaining knowledge and understanding of the phases of the hydration process (i.e., dormant, setting, and hardening) plays an important role in the timely opening of roads, resuming of construction, and achieving long-term performance. Standard tests such as ASTM C403 arbitrarily define the time of initial and final setting of concrete. Despite decades of studies concerning setting times, actual predictions still span hours, while the quality …
Evaluation Of Recycled Gypsum Application Dosages To Enhance The Water Infiltration Rate At Water Retention Ponds, Jorge Luis Navarrete
Evaluation Of Recycled Gypsum Application Dosages To Enhance The Water Infiltration Rate At Water Retention Ponds, Jorge Luis Navarrete
Open Access Theses & Dissertations
The retention ponds play central role for efficient collection, removal, and drainage of rainfall runoff from surrounding streets to minimize flooding and damage. However, low percolating retention ponds may result in an extended ponding of water, abundance bacteria accumulations, mosquito breeding, environmental hazards, among others. The presence of clayey soils and soil sodicity reduces infiltration rates of retention ponds. To enhance the infiltration rate of ponds, it is proposed to use recycled gypsum (RG), as a soil amendment in retention ponds consisting of clayey soils to enhance low infiltration rates.
To evaluate the influence of RG in clayey soils as …
Roofing Practices And Fall Prevention In The Construction Industry, Hadi A. Shishtar
Roofing Practices And Fall Prevention In The Construction Industry, Hadi A. Shishtar
Graduate Theses, Dissertations, and Problem Reports
Roofing is an important profession in the construction industry yet there is a lack of understanding of its safeness. It is generally believed that roofing is an occupation that can be easily practiced by anyone. However, there are many key factors that are associated with roofing, which may impact the lives of roofers who often face major risks at work. According to the Occupational Safety and Health Administration (OSHA), roofing is one of the leading causes of falling deaths among construction workers. The Bureau of labor statistics has reported that roofers are highly exposed to non-fatal injuries. They have also …
The Determination Of The Concrete Tensile Creep At Early Age Using The Ring Test, Tadamon Mohammed
The Determination Of The Concrete Tensile Creep At Early Age Using The Ring Test, Tadamon Mohammed
Graduate Theses, Dissertations, and Problem Reports
In this study, the modified double power law (MDPL) model is used to determine the tensile creep of concrete at an early age based on the ASTM C1581 restrained shrinkage ring test. Three concrete mixes using Ordinary Portland Cement (OPC) were tested. The three concrete mixes were cast, and each underwent the ring tests up to cracking. Mechanical properties of concrete at the age of 1, 3, 7, 14, and 28 days were tested to find the compressive strength, tensile strength and Young’s Modulus of concrete. The strength tests results were obtained from both 4x8 inch and 6x12 inch cylinders. …
Wildfire Emissions In The Context Of Global Change And The Implications For Mercury Pollution, Aditya Kumar
Wildfire Emissions In The Context Of Global Change And The Implications For Mercury Pollution, Aditya Kumar
Dissertations, Master's Theses and Master's Reports
Wildfires are episodic disturbances that exert a significant influence on the Earth system. They emit substantial amounts of atmospheric pollutants, which can impact atmospheric chemistry/composition and the Earth’s climate at the global and regional scales. This work presents a collection of studies aimed at better estimating wildfire emissions of atmospheric pollutants, quantifying their impacts on remote ecosystems and determining the implications of 2000s-2050s global environmental change (land use/land cover, climate) for wildfire emissions following the Intergovernmental Panel on Climate Change (IPCC) A1B socioeconomic scenario.
A global fire emissions model is developed to compile global wildfire emission inventories for major atmospheric …
Probabilistic Regional Landslide Hazard Assessment For The Enguri Dam (Jivari, Georgia), Maria Diletta Acciaro
Probabilistic Regional Landslide Hazard Assessment For The Enguri Dam (Jivari, Georgia), Maria Diletta Acciaro
Dissertations, Master's Theses and Master's Reports
The Enguri Dam forms a reservoir in a seismically active area in the foothills of the Caucasus Mountain range near Jvari, Georgia. The slopes are steep, highly fractured, and weathered, which make them at risk to failure during or following extreme rainfall events. Hydroelectricity produced by the water retained by the 271-m dam provides almost half of the electricity for the country. The reservoir perimeter is more than 40 km and the surrounding slopes span an area of more than 30 km2. The size of the area and paucity of slope data have made slope-failure hazard assessment of the broader …
Building Information Modeling (Bim) Impact On Construction Performance, David D. John
Building Information Modeling (Bim) Impact On Construction Performance, David D. John
Electronic Theses and Dissertations
This study is designed to address the need for having a measure for Construction Performance on BIM-assisted construction projects. Through this study a new Construction Key Performance Indicator (CKPI) matrix is identified and created by the author. The CKPI could be used to assess BIM-assisted projects. Utilizing a sequential mixed methodology approach, academic and practitioner perspectives are assessed. A qualitative content analysis and quantitative descriptive analysis based on demographics are conducted to establish a better understanding of BIM and Construction Performance. The academic perspective is used to assess the relevance of BIMM and CKPI indicators, and the practitioner perspective is …
Bioaccessibility Of Lead From Contaminated Soil Using Phosphate Treatment -- Physiologically Based Extraction Test And In Vitro Gastrointestinal Method Test, Austin Charles Doss
Bioaccessibility Of Lead From Contaminated Soil Using Phosphate Treatment -- Physiologically Based Extraction Test And In Vitro Gastrointestinal Method Test, Austin Charles Doss
Masters Theses
"Phosphate treatments are used to immobilize lead in soil by forming pyromorphite. Soil from Bonne Terre, Mo was collected to study whether such treatment decreases the bioaccessibility of lead. The soil was treated using 0.5 soil wt% of phosphate. Treatments were: none, phosphoric acid, triple super phosphate, and organic bone meal. Each sample was studied after one, four, sixteen, and twenty weeks; during this time span, water was added approximating the average rainfall rate. Percolated water was collected to test the leached phosphate concentrations. Phosphate was below the detection limit in that leachate. Remediated soil samples were used in Physiologically …
Simultaneous Enhancement Of Fluidity And Thixotropy Of Vibration-Free Concrete, Piyush Rajendra Lunkad
Simultaneous Enhancement Of Fluidity And Thixotropy Of Vibration-Free Concrete, Piyush Rajendra Lunkad
Masters Theses
"This research articulates the development of a vibration-free concrete for slip-form paving enabling a simple and rapid construction process. To achieve this, properties such as rheology including thixotropy, shape stability, and workability loss with time are mainly investigated. Concrete mixture with high thixotropic strength and its shape holding ability, flowability, and workability retention with time is evaluated. This study consists of two phases: (1) selection of paste component from rheology of cement paste incorporating various micro- and nano- sized particles (2) study of fresh properties of concrete mixtures using the excess paste layer concept.
From the cement paste study, it …
Nonlinear Finite Element Analysis Of Concrete Columns Subjected To Complex Loading, Adam Christopher Morgan
Nonlinear Finite Element Analysis Of Concrete Columns Subjected To Complex Loading, Adam Christopher Morgan
Masters Theses
"This study details the development and implementation of a finite element model within a commercial finite element code, Abaqus CAE, for the analysis of reinforced concrete (RC) bridge columns containing interlocking spirals subjected to combined loading conditions including axial, shear, bending, and torsional loads, including the post-peak response. The model is a first of its kind attempt at simulating the response of RC columns with continuous spiral transverse reinforcement and subjected to combined loading conditions including torsion. The model is utilized to determine the quasi-static load-deformation response under various proportions of the input loads and displacements. The resulting quasi-static load-deformations, …
Cellulose And Sulfate Degradation In A Biochemical Reactor During Treatment Of Mine Drainage, Sweta Ojha
Cellulose And Sulfate Degradation In A Biochemical Reactor During Treatment Of Mine Drainage, Sweta Ojha
Masters Theses
"Seventy-two biochemical reactors were set up, and operated using a mixture of chip-bark, horse manure, and gravel as the biochemical treatment substrate. The simulated mine water containing sulfate (1000 mg/l) was pumped into each reactor at a flow rate of 0.5 ml/minute (approximate), giving an empty bed contact time of 8 days. The main idea is that the microorganisms present in horse manure would convert the cellulose in chip-bark into volatile fatty acids. The produced volatile fatty acid would enhance the metabolism of sulfate-reducing bacteria (SRB) initially present in horse manure, which would degrade (and eventually remove) the sulfate from …
Compressive Behavior Of Masonry Columns Confined With Steel Reinforced Grout (Srg) Composite, Sarah Elizabeth Jemison
Compressive Behavior Of Masonry Columns Confined With Steel Reinforced Grout (Srg) Composite, Sarah Elizabeth Jemison
Masters Theses
"In this study, a new type of composite comprised of steel fiber cords embedded in a natural hydraulic lime mortar matrix, known as steel reinforced grout (SRG), is explored for the use in confinement of masonry columns. An experimental study was carried out to understand the behavior of solid clay brick masonry columns confined by SRG jackets. Twenty-four confined and seven unconfined columns with a square cross-section were tested to failure under a monotonic concentric compressive load. Test parameters considered were the column corner condition, number of fiber jacket layers, and number of fiber overlapping faces. SRG confinement improved the …
Imaging The Subsurface In Eastern Part Of Lake Chesterfield Using A Combination Of Geophysical Tools, Jiawei Li
Imaging The Subsurface In Eastern Part Of Lake Chesterfield Using A Combination Of Geophysical Tools, Jiawei Li
Masters Theses
"The Lake Chesterfield North Dam in Wildwood city, Missouri has been leaking, more or less continuously since the dam was constructed in 1986 despite mitigation efforts in 1988, 1994, 1995, 2004, and 2005. Neither the grouting efforts in 1988, 1994, 1995, 2004 or 2005, nor the placement and rehabilitation of an impervious clay liner in 2005 has solved the problem. Indeed, in June of 2017, the water level in Lake Chesterfield dropped at an alarmingly rapid rate.
Prior to authorizing additional mitigation work, the Lake Chesterfield Home Owners Association (LCHOA) decided to acquire geophysical data across the dry lake bed. …
Estado Del Arte De La Gestión Del Riesgo De Los Municipios Pertenecientes A La Cuenca Del Río Cusiana Con Base En La Ley 1523, Diego Andrés Marín Rojas, Santiago Suárez Barrera
Estado Del Arte De La Gestión Del Riesgo De Los Municipios Pertenecientes A La Cuenca Del Río Cusiana Con Base En La Ley 1523, Diego Andrés Marín Rojas, Santiago Suárez Barrera
Ingeniería Civil
No abstract provided.
Estudio De La Factibilidad Para Vivienda De Interés Social En El Área Rural Del Municipio De Ubaque Cundinamarca, Maria Fernanda Ariza Suarez, Jessica Paola Acero Linares
Estudio De La Factibilidad Para Vivienda De Interés Social En El Área Rural Del Municipio De Ubaque Cundinamarca, Maria Fernanda Ariza Suarez, Jessica Paola Acero Linares
Ingeniería Civil
El proyecto consistió en determinar la factibilidad para construir vivienda de interés social en el área rural del municipio de ubaque Cundinamarca, en la vereda CENTRO AFUERA. Este trabajo se inició con un estudio de pre inversión, el cual consta de cuatro etapas: idea, perfil, pre factibilidad y factibilidad; en cada una de ellas se expusieron las ventajas y desventajas desde el punto de vista técnico, ambiental, social, económico y financiero, llevando cada estudio al nivel de detalle según el ciclo de vida del proyecto. Se inició con un estudio de mercado determinando la oferta y la demanda en el …
Cyclic Axial Compression Behavior Of Concrete-Filled Hybrid Large Rupture Strain Frp Tubes, Monika Nain
Cyclic Axial Compression Behavior Of Concrete-Filled Hybrid Large Rupture Strain Frp Tubes, Monika Nain
Masters Theses
"This study introduces an experimental investigation of the behavior of concrete filled fiber reinforced polymer (FRP) tubes (CFFTs) under cyclic axial compression. The FRP used in this study were either small rupture strain FRP (SRS-FRP) or large rupture strain FRP (LRS-FRP). This paper also presents the first-ever experimental study on the behavior of concrete confined using hybrid LRS-FRP and SRS-FRP. LRS-FRP included PEN (polyethylene napthalate) and PET (polyethylene terephthalate) where both of them having ultimate axial strain larger than 5%, and low stiffness. SRP-FRP included carbon and glass FRP having small rupture strains, smaller than 2%, and high stiffness. The …
Numerical And Experimental Analysis Of Local Buckling Of Axially Loaded Steel Tubes Confined By Concrete And Frp, Nicholas Colbert
Numerical And Experimental Analysis Of Local Buckling Of Axially Loaded Steel Tubes Confined By Concrete And Frp, Nicholas Colbert
Masters Theses
“The hollow core Fiber-Reinforced-Polymer (FRP) concrete circular-steel (HC-FCS) column consists of an outer circular fiber reinforced polymer (FRP) tube, an inner thin-walled circular steel tube concentrically aligned, and a concrete shell between them. Research has been performed on the performance of the member as a whole, but to date, there has been no investigation into the behavior of the steel tube confined in the column. 17 small-scale columns were tested under axisymmetric axial compressions applied directly to the steel tube under displacement control. The conducted parametric study examined the effects of diameter-to-thickness (D/t) ratio, concrete unconfined compressive strength, FRP thickness, …
Thermal Curing Efficiency Of Geopolymer Mortars, Simon Peter Sargon
Thermal Curing Efficiency Of Geopolymer Mortars, Simon Peter Sargon
Masters Theses
”Missouri is the fourth largest coal consumer in the U.S. with coal-fired power plants generate 81.3% of the electricity in the state which generate about 2.7 million tons of coal combustion residuals (CCRs) annually. The CCR, including fly ash, disposal issue is not limited to Missouri, rather it is a national issue with CCRs being the second largest waste stream in the U.S. Ninety million tons of fly ash are stored in landfills and ash ponds annually. Hence, using this waste product effectively is necessary. One of the emerging applications of fly ash is to use it as binder in …
Designing And Testing 3-D Printed Wafer-Box With Embedded Pzt Sensors To Identify The Shape Effect On Energy Harvesting, Ahmad Jami Safayet
Designing And Testing 3-D Printed Wafer-Box With Embedded Pzt Sensors To Identify The Shape Effect On Energy Harvesting, Ahmad Jami Safayet
Electronic Theses and Dissertations
Piezoelectric energy has been recently paid attention in the field of alternative energy. Day by day the traditional energy sources including Coal tar and oils are becoming scarce. People are heading to an alternative energy source to meet the future energy demand. Piezoelectric energy is one of the competitive energy sources compared to the conventional renewable energy sources including solar, wind, and geothermal power and so on. This energy production method bears enormous research potential because it can be used as the roadway for a new method of power generation. This research project aimed to identify which shaped wafer-box produced …
An Assessment Of Trihalomethanes And Haloacetic Acids On The Cancer Exposure Risk Of Ohio Drinking Water Systems, Stephen Sykes
An Assessment Of Trihalomethanes And Haloacetic Acids On The Cancer Exposure Risk Of Ohio Drinking Water Systems, Stephen Sykes
Williams Honors College, Honors Research Projects
The cancer exposure risk from drinking chlorine-based disinfection by-products (DBPs) such as trihalomethanes (THMs) and haloacetic acids (HAAs) has been established as a major concern to public health as 98% of the United States drinking water systems in operation use chlorinated systems to disinfect the water they provide [2]. Using data collected from the Ohio Environmental Protection Agency from January 2014 to September 2017 in the cites of Cleveland, Columbus, Cincinnati, Canton, and Akron this study attempts to look at the risk of cancer caused by the DBPs. To show the relative risk of several different systems in operation from …
Feasibility Study Of Solar Generation Facilities: Are Ccr Landfills A Viable Location, Jaden Beachy
Feasibility Study Of Solar Generation Facilities: Are Ccr Landfills A Viable Location, Jaden Beachy
Williams Honors College, Honors Research Projects
this report will examine the feasibility of constructing and operating a solar generation facility on a coal combustion residual landfill. The total generation capabilities of a generation facility located near Nashville, Tennessee will be compared to the total cost of construction, including but not limited to Photo-voltaic panels, construction materials and labor.
Effects Of Hurricane Harvey And Irma On State Building Codes, Nathaniel Otermat
Effects Of Hurricane Harvey And Irma On State Building Codes, Nathaniel Otermat
Williams Honors College, Honors Research Projects
2017 was one of the worst hurricane seasons on record. Two major hurricanes hit to date; one in Houston, one across the chain of islands South of Florida and then on to Florida directly. What ensued was massive flooding and total destruction of many structures.
To protect against these natural disasters, a set of building codes is in place. While this is effective for most buildings stateside, it is hardly a consideration outside the U.S. Many of the structures built in the islands were built with little regard to any sort of code in mind. Even in the states where …
Basic Highway Workzone Safety, Collin Shamberger
Basic Highway Workzone Safety, Collin Shamberger
Williams Honors College, Honors Research Projects
The purpose of this essay will be to examine, and provide information detailing work zone safety practices, and maximizing safety in construction zones. This report will examine the functionality of components of a work zone and how they work together, the use of standard construction drawings of work zones, personal protective equipment of workers, possible hazards of work zones, minimizing risks and ultimately work zone safety training. Also this report will provide a spreadsheet which can be used to calculate and layout a construction work zone based on a GPS location.
Building Entry Flood Barrier, Richard Esker, Shannon Mccall, Andrew Udovich, Brian Foust
Building Entry Flood Barrier, Richard Esker, Shannon Mccall, Andrew Udovich, Brian Foust
Williams Honors College, Honors Research Projects
The purpose of this project is to develop a flood barrier that would resist flood water from entering through the doorways of a building. The goal is to mitigate extensive flooding within a structure. After the disastrous weather events that impacted American citizens late in the year of 2017, the team was inspired to develop a project to help disaster victims. Through extensive preliminary and market research, it was discovered that flooding is a serious issue that affects people all over the world. A product to stop flooding could benefit people in developed countries, but it could also help citizens …