Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Institution
- Publication
Articles 1 - 30 of 40
Full-Text Articles in Entire DC Network
Manufacturing And Evaluation Of Structural Products With Recycled Polymers, Raghuram Phani Aditham
Manufacturing And Evaluation Of Structural Products With Recycled Polymers, Raghuram Phani Aditham
Graduate Theses, Dissertations, and Problem Reports
The rapid growth of Wastes from Electrical and Electronic Equipment (WEEE) can be attributed to the rapid developments in technology, leading to reduction in service life to less than 2 years in certain products. Thermoplastics such as Acrylonitrile-Butadiene-Styrene (ABS) and Polycarbonate (PC) form a significant percent of the Electronic Shredder Residue (ESR) that were used in this research to manufacture and evaluate structural products with recycled polymers.;In this research, offset blocks for highway and bridge guardrail systems were developed using recycled polymers reinforced with glass fabric as shell and discarded tire strips/wood as core materials. Optimum compression molding process parameters …
Effect Of Driving Cycles On The Particulate Mass And Number Emissions From In-Use Heavy Heavy-Duty Diesel Vehicles, Sairam Thiagarajan
Effect Of Driving Cycles On The Particulate Mass And Number Emissions From In-Use Heavy Heavy-Duty Diesel Vehicles, Sairam Thiagarajan
Graduate Theses, Dissertations, and Problem Reports
This study focused primarily on the particle mass and number emission from various in-use heavy heavy-duty diesel vehicles operating on different driving cycles. Chemical speciation results are also presented to discuss the formation and composition of particles emitted during various cycles. Tests were performed with West Virginia University's Transportable Heavy Duty Vehicle Emissions Testing Laboratory located at Riverside, California. Five vehicles were selected to cover a wide range of model year from 1989 to 2004. All five vehicles were subjected to chemical speciation and analysis conducted by Desert Research Institute. WVU employed the use of the Scanning Mobility Particle Sizer …
Development Of A Test Method To Measure "In-Use" Emissions From Stationary And Portable Diesel Sources, Gurudutt A. Nayak
Development Of A Test Method To Measure "In-Use" Emissions From Stationary And Portable Diesel Sources, Gurudutt A. Nayak
Graduate Theses, Dissertations, and Problem Reports
A cost-effective, accurate and easy-to-use in-field test method was developed that would allow regulatory bodies, such as the California Air Resources Board (CARB) to determine in-use compliance with emission standards for newly manufactured portable and stationary engines. As emissions measured during an engine-dynamometer test do not faithfully reflect real-world emissions, a test method that functions like an Inspection and Maintenance (I/M) type test method was developed. Only concentration measurements of pollutants such as oxides of nitrogen (NO x) and carbon dioxide (CO2) are required to determine compliance using this "compliance factor, F" approach. Hence, errors introduced due to engine work …
Use Of Commercial Cfd Software For Assessing The Performance Of Personal Aerosol Samplers, Aaron J. Bird
Use Of Commercial Cfd Software For Assessing The Performance Of Personal Aerosol Samplers, Aaron J. Bird
Graduate Theses, Dissertations, and Problem Reports
Accurate performance of personal aerosol samplers is critical for industrial hygienists' successful efforts to protect workers. Performance assessments of personal samplers are necessarily conducted in controlled environments so unknown sources of variability will not influence the results. This is done in order that samplers may be used with confidence for monitoring workplace air quality. These performance evaluations are usually conducted in wind tunnels. However, recent advances in high-performance cluster computing---together with advanced flow modeling software---have made it possible to evaluate sampler performance with computer simulations. This was done in the current research. Simulations were conducted for air and particle behavior …
Linear Engine Development For Series Hybrid Electric Vehicles, Csaba Toth-Nagy
Linear Engine Development For Series Hybrid Electric Vehicles, Csaba Toth-Nagy
Graduate Theses, Dissertations, and Problem Reports
This dissertation argues that diminishing oil reserves, concern over global climate change, and desire to improve ambient air quality all demand the development of environment-friendly personal transportation. In certain applications, series hybrid electric vehicles offer an attractive solution to reducing fuel consumption and emissions. Furthermore, linear engines are emerging as a powerplant suited to series HEV applications. In this dissertation, a linear engine/alternator was considered as the auxiliary power unit of a range extender series hybrid electric vehicle. A prototype linear engine/alternator was developed, constructed and tested at West Virginia University. The engine was a 2-stroke, 2-cylinder, dual piston, direct …
Finite Element Analysis Of Interaction Between Actin Cytoskeleton And Intracellular Fluid In Prechondrocytes And Chondrocytes Subjected To Compressive Loading, Sundar Viswanathan
Finite Element Analysis Of Interaction Between Actin Cytoskeleton And Intracellular Fluid In Prechondrocytes And Chondrocytes Subjected To Compressive Loading, Sundar Viswanathan
Graduate Theses, Dissertations, and Problem Reports
Prechondrocytes exhibit a change in their actin cytoskeletal arrangement when subjected to loading. This study looks at the implications of the altered solid-fluid interactions due to this change. A 2-D Finite element model of a cell was developed. A solid-fluid interaction solution procedure was validated and used to determine fluid flow/pressure in a cell when subject to deformation. These values were then used to calculate fluid flow induced stresses on individual actin fibers. The results suggest that prechondrocytes alter their cytoskeletal structure to reduce stresses as a result of fluid flow due to deformation of the cell.
Experimental Validation Of The "Target Hood Static Pressure" Balancing Method For Exhaust Ventilation Systems, Michael Winifred Dodrill
Experimental Validation Of The "Target Hood Static Pressure" Balancing Method For Exhaust Ventilation Systems, Michael Winifred Dodrill
Graduate Theses, Dissertations, and Problem Reports
An experimental trial of a new method to balance industrial exhaust ventilation systems was performed. Although balance by design is considered preferable, many ventilation systems incorporate dampers to balance the system to a different airflow distribution after installation. The "target hood static pressure" method aims to minimize the time, effort, frustration and confusion invested in the balancing effort. It requires only one and one-half adjustment rounds, can be prepared as a computerized spreadsheet, and substitutes hood static pressure readings for airflow traverse readings. The method also minimizes the system static pressure to the least possible, thereby keeping friction losses at …
Load-Based Energy Savings In Three-Phase Squirrel Cage Induction Motors, Subodh Chaudhari
Load-Based Energy Savings In Three-Phase Squirrel Cage Induction Motors, Subodh Chaudhari
Graduate Theses, Dissertations, and Problem Reports
Energy is an extremely valuable resource which should be used carefully. After realizing this in the 1990's DOE started various energy efficiency measures in order to reduce the energy consumed by US industry. Motors use almost 50 percent of the electricity in the United States. If motor efficiency could be increased then energy consumption could be reduced. There have been efforts to increase motor efficiency over past decade which lead to development of premium efficiency motors. Designed motor efficiency is normally above 90 percent so motors do not waste energy. However, motor efficiency decreases when load factor is less than …
Reduction Of Natural Gas Engine Emissions Using A Novel Aftertreatment System, Timothy S. Burlingame
Reduction Of Natural Gas Engine Emissions Using A Novel Aftertreatment System, Timothy S. Burlingame
Graduate Theses, Dissertations, and Problem Reports
The global objective of this study was to develop an exhaust aftertreatment system to reduce gaseous and particulate matter emissions from natural gas fueled vehicles. Specific objectives of this study were to evaluate and characterize emissions from a natural gas fueled vehicle powered by a Cummins C8.3G+ engine with and without the particulate matter (PM) filter and oxidation catalyst (OC) combination, which was designed and developed by West Virginia University in collaboration with Lubrizol-ECS. Central Business District (CBD) Cycle tests were performed on West Virginia University's Transportable Emissions Testing Laboratory. A heavy-duty transportable chassis dynamometer and a dedicated "clean" dilution …
Electrochemical Impedance Spectroscopy Of Proton Exchange Membrane Fuel Cell Stacks, Brian J. Hetzer
Electrochemical Impedance Spectroscopy Of Proton Exchange Membrane Fuel Cell Stacks, Brian J. Hetzer
Graduate Theses, Dissertations, and Problem Reports
Electrochemical Impedance Spectroscopy (EIS) is applied to a small, four cell Proton Exchange Membrane (PEM) fuel cell stack to examine the stack response as the load current changes. The measured stack response is compared to a simulated response generated by a stack model that has been developed using MATLAB. The results show that the model predicted well the behavior of the VI curve for currents less than 50 Amps. The model also qualitatively predicted the impedance response as a function of current and frequency. Because of apparent model incompleteness, it was not able to predict accurately the shape of the …
Honeycomb Fiber-Reinforced Polymer Sandwich Composites For Development Of Aquaculture Raceway Systems, Avinash Vantaram
Honeycomb Fiber-Reinforced Polymer Sandwich Composites For Development Of Aquaculture Raceway Systems, Avinash Vantaram
Graduate Theses, Dissertations, and Problem Reports
It is argued that the utilization of impaired mine waters abundant in WV and other mid-Appalachian states for fish culture can substantially increase aquaculture economic development. The primary limitation to the effective utilization of discharged waters is the lack of suitable fish culture tanks that can be easily installed in rugged terrains surrounding mine water treatment plants, where cast-in-place concrete tanks cannot be constructed. Therefore, Fiber-Reinforced Polymer (FRP) sandwich materials offer an economical option for production of light, transportable and durable fish culture raceway systems. This study is concerned with the development and evaluation of prototype fish culture tanks using …
Effects Of Artificial Neural Network Speed-Based Inputs On Heavy-Duty Vehicle Emissions Prediction, Nastaran Hashemi
Effects Of Artificial Neural Network Speed-Based Inputs On Heavy-Duty Vehicle Emissions Prediction, Nastaran Hashemi
Graduate Theses, Dissertations, and Problem Reports
The PM split study was performed in Southern California on thirty-four heavy-duty diesel vehicles using the West Virginia University Transportable Heavy-Duty Vehicle Emissions Testing Laboratories to gather emissions data of these vehicles. The data obtained from six vehicles in the 1985--2001 model year and 33,000--80,000 lb weight range exercised through three different cycles were selected in this thesis. To predict the instantaneous levels of oxides of nitrogen (NOx), carbon dioxide (CO2), hydrocarbons (HC) and carbon monoxide (CO), an Artificial Neural Network (ANN) was used. Axle speed, torque, their rates of change over different time periods and two other variables as …
Influence Of Rearrangement Of Actin Cytoskeleton On The Overall Material Properties Of Atdc5 Cells During Chondrogenesis, Madhavi V. S. Ayyalasomayajula
Influence Of Rearrangement Of Actin Cytoskeleton On The Overall Material Properties Of Atdc5 Cells During Chondrogenesis, Madhavi V. S. Ayyalasomayajula
Graduate Theses, Dissertations, and Problem Reports
Studies show that when chondrocytes are cultured in 2D, they lose their phenotype. This change is reversed when the cells are embedded in a 3D culture system such as in agarose gel. Previous experiments in our lab showed that when prechodrocytic cells were embedded in agarose, chondrogenesis was triggered in these cells. This work attempts to understand the mechanical implications of this behavior. It also provides an estimate of the sensitivity of the apparatus that would be required to carry out compression loading experiments of gel-cell constructs that can distinguish between pre-chondrocytes and chondrocytes.;ATDC5 cells were cultured in 3D for …
Finite Element Simulation Of Creep Behavior In Enhanced Refractory Material For Glass Furnace, Praveen Kumar Kuntamalla
Finite Element Simulation Of Creep Behavior In Enhanced Refractory Material For Glass Furnace, Praveen Kumar Kuntamalla
Graduate Theses, Dissertations, and Problem Reports
An important focus in the glass melting industry, which is an energy intensive industry, is towards greater output and increased energy efficiency in the glass melting process. Conversion to the oxy-fuel-fired furnace from the traditional air-fuel-fired furnace is one means to achieve greater output and energy efficiency, since the capital cost per ton of glass pulled is approximately 58% less for the oxy-fuel-fired furnace compared to the air-fuel-fired furnace.;The main disadvantages of the oxy-fuel-fired furnace are its higher operating temperature, possibly to more than 2200°F, and its alkali partial pressure that hasten the corrosion of refractory materials, particularly in silica …
Dynamic Modal Analysis And Optimization Of C-130 Project Oculus' Mechanical Arm/Pod Sensor Deployment System Using The Finite Element Method, Adam C. Naternicola
Dynamic Modal Analysis And Optimization Of C-130 Project Oculus' Mechanical Arm/Pod Sensor Deployment System Using The Finite Element Method, Adam C. Naternicola
Graduate Theses, Dissertations, and Problem Reports
The Department of Defense (DoD) and the United States Army National Guard (USARNG) have sponsored West Virginia University's Center for Industrial Research Applications (CIRA) to design, fabricate, test and optimize an articulating, mechanical arm/pod system. The mechanical arm/pod system will be designed to accommodate a 500-pound sensor payload deployable in flight from a C-130 Hercules military aircraft used for counter narco-terrorism efforts. During the overall deployment (translation and rotation) of the mechanical arm/pod system and in the final resting position for optimal operating conditions for the data acquisition sensors (DAS), the mechanical structure will be subjected to a variety of …
Failure Mechanisms In Impact Erosion Of Ductile Materials, Ramesh Padavala
Failure Mechanisms In Impact Erosion Of Ductile Materials, Ramesh Padavala
Graduate Theses, Dissertations, and Problem Reports
Solid particle erosion in ductile materials is a common problem in many industrial applications. It is defined as material loss resulting from the mechanical contact between the particle and the metal surface. Many experimental studies were reported in the past to determine the loss of the material due to these ductile impacts. Conducting experiments for numerous materials at different conditions is difficult and costly. A finite element model to predict the ductile erosion loss at various conditions for different materials is more expedient.;In this thesis a finite element model was developed to predict the erosion loss for AL 6061-T0 at …
Particle Breakage In Sand Blasting Due To Impact On Ductile Materials, Ravi Kishore Bandaru
Particle Breakage In Sand Blasting Due To Impact On Ductile Materials, Ravi Kishore Bandaru
Graduate Theses, Dissertations, and Problem Reports
Cleaning of rust, paint or removing burrs and many other such applications are done by several processes. Sand blasting is one of them, where a stream of sand particles is forcefully projected onto a surface, with compressed air or steam. These sand particles break up into very small pieces upon impact, which are inhaled by workers to cause silicosis. While much research has been done on the surface being impacted, very little research has been done on the particle itself. Hence, proper analytical modeling of the sand blasting process from the particle perspective, validated by experimental results, is required to …
Finite Element Modeling Of Crack Detection In Aircraft Structures Using Electrical Current, Ramkumar Kumar Geetha
Finite Element Modeling Of Crack Detection In Aircraft Structures Using Electrical Current, Ramkumar Kumar Geetha
Graduate Theses, Dissertations, and Problem Reports
Various non-destructive test methods have been developed for the detection of cracks in metallic structures. Electromagnetic non-destructive testing (NDT) is one of the widely used non-destructive methods used for the detection and characterization of cracks. Utilizing the principle of electromagnetic induction, this technique is used in the areas of nuclear, aerospace, power, transport, petroleum and other industries to inspect defects in metallic sheets, plates and tubes that have good electrical conductivity.;Aircraft structures and wings are made of aluminum sheets riveted together. Cracks are often found emanating from the edge of the rivet holes which are covered by the rivets and …
Smoking And Dose-Dependent Early Effects Of Nicotine On Bone Mechanical Properties And Histology, Daniel Shaw Porter
Smoking And Dose-Dependent Early Effects Of Nicotine On Bone Mechanical Properties And Histology, Daniel Shaw Porter
Graduate Theses, Dissertations, and Problem Reports
The objective was to study the effects of nicotine and cigarette smoke on mechanical properties of cortical bone. Experiments were conducted for 5 weeks with New Zealand White Rabbits. The first experiment of 18 rabbits studied the effect of nicotine levels delivered via a nicotine patch (5.25, 10.5, 21 ng/ml), measured by different mechanical tests, porosity, and composition. There was no significant difference between the control and the treatment groups.;The second experiment of 22 rabbits studied the effects of nicotine delivered via a nicotine patch (10.5 ng/ml) and via a smoking chamber on fracture toughness and porosity. The rabbits exposed …
Design Of A Standardized Sensor Platform For A C-130 Aircraft, Zenovy S. Wowczuk
Design Of A Standardized Sensor Platform For A C-130 Aircraft, Zenovy S. Wowczuk
Graduate Theses, Dissertations, and Problem Reports
The development of a standardized sensor pallet system for a C-130 aircraft was conceived by the National Guard to assist in counterdrug reconnaissance activities within the United States. Before development, the design parameters were established by the National Guard mission requirements and by the limitations of the C-130 aircraft. These limitations include using Commercial off the Shelf (COTS) and Government off the Shelf (GOTS) items when developing the system that must be universal on all C-130 aircraft variants B thru H. Further design criteria are delegated by the limitations of the C-130 aircraft. The following work describes the design process …
The Development Of An Accelerated Testing Facility For The Study Of Deposits In Land-Based Gas Turbine Engines, Jared Wilfred Jensen
The Development Of An Accelerated Testing Facility For The Study Of Deposits In Land-Based Gas Turbine Engines, Jared Wilfred Jensen
Theses and Dissertations
Turbine engine efficiency modeling depends on many parameters related to fluid dynamics and heat transfer. Many of these parameters change dynamically once the engine enters service and begins to experience surface degradation. This thesis presents a validation of the design and operation of an accelerated testing facility for the study of foreign deposit layers typical to the operation of land-based gas turbines. It also reports on the use of this facility in an effort to characterize the change in thermal resistance on the surface of turbine blades as deposits accumulate. The facility was designed to produce turbine deposits in a …
Application Of Digital Infrared Thermography For Nondestructive Evaluation Of Composite Bridge Components, Archana Vasudevan
Application Of Digital Infrared Thermography For Nondestructive Evaluation Of Composite Bridge Components, Archana Vasudevan
Graduate Theses, Dissertations, and Problem Reports
The objective of this research is to evaluate the applicability of digital infrared thermographic system to detect subsurface defects such as debonds and delaminations in Fiber Reinforced Polymer (FRP) bridge decks and other composite bridge components such as beams and columns wrapped with steel or FRP jacket.;This thesis investigates the use of digital infrared thermography on FRP bridge decks both under laboratory and field conditions. Air-filled and water-filled debonds were inserted between the wearing surface and the underlying FRP deck. Also, simulated subsurface delaminations (of various sizes and thickness) were created at the flange-to-flange junction between two FRP deck modules.;The …
Analysis Of Composite Moving Beams Using Higher Order Shear Deformation Theory, Govindan Nagappan
Analysis Of Composite Moving Beams Using Higher Order Shear Deformation Theory, Govindan Nagappan
Graduate Theses, Dissertations, and Problem Reports
A Composite beam moving longitudinally over its supports is analyzed based on a higher-order shear deformation theory. The dynamic behavior of the beam is carried out using the finite element method. The formulation is based on a variational principle. The essential constraints are applied via Lagrange multipliers. This method is effective for the moving beam problem where the relative support locations change with time and therefore the supports do not fall exactly at the nodes. An initially deformed overhang beam moving over two simple supports is used for the analysis. The first flexural mode shape of the beam is used …
Repeatability Of On-Road Routes And A Comparison Of On-Road Routes To The Federal Test Procedure, J. Axel Radermacher
Repeatability Of On-Road Routes And A Comparison Of On-Road Routes To The Federal Test Procedure, J. Axel Radermacher
Graduate Theses, Dissertations, and Problem Reports
West Virginia University has developed a Mobile Emissions Measurement System that recorded vehicle, engine, and exhaust behavior during in-use testing. This system obtained data from numerous vehicles over specified on-road routes. A study was conducted on on-road route repeatability. A methodology for finding repeatability had to be established, and factors influencing repeatability were identified. It was found that routes and drivers significantly influenced repeatability, and that further study of a larger sample group needs to be conducted before specific conclusions could be drawn about the influences of the vehicle on repeatability.;A further study was conducted on how well the on-road …
Design, Fabrication, And Testing Of A Miniature Impulse Turbine Driven By Compressed Gas, Daniel B. Holt
Design, Fabrication, And Testing Of A Miniature Impulse Turbine Driven By Compressed Gas, Daniel B. Holt
Theses
A miniature impulse turbine has been developed at the Rochester Institute of Technology. The goal of this project was to design, fabricate, and test a miniature turbine intended to power small vehicles such as micro air vehicles (MAVs). MAVs are vehicles with a maximum dimension of less then 15 cm and are used for surveillance and scouting. Due to the small size of MAVs, weight is a key design parameter. The batteries alone can account for more than 50% of the weight of the entire vehicle. A miniature turbine driven by compressed gas and coupled to a generator has been …
Separation Of Small Particles Due To Density Differences In A Cfb Riser System, Jeremy L. Regester
Separation Of Small Particles Due To Density Differences In A Cfb Riser System, Jeremy L. Regester
Graduate Theses, Dissertations, and Problem Reports
Common wet density separation processes require large amounts of water, expensive wastewater cleanup, and do not effectively recover fine particles. A circulating fluidized bed riser system was developed as an exploratory system for dry separation by density that will eliminate many problems associated with wet separation. The system sends an air-solid mixture through a vertical riser. The flow pattern in the riser, established by varying gas velocity (Uo) and mass flux (Jp), allowed dense particles to collect at the bottom of the riser while less dense particles were collected through the riser exit at the top. The system was developed …
Cohesive Zone Model For Facesheet -Core Interface Delamination In Honeycomb Frp Sandwich Panels, Weiqiao Wang
Cohesive Zone Model For Facesheet -Core Interface Delamination In Honeycomb Frp Sandwich Panels, Weiqiao Wang
Graduate Theses, Dissertations, and Problem Reports
The focus of this dissertation is on developing efficient modeling techniques to study facesheet-core interface delamination in honeycomb fiber-reinforced polymer (HFRP) sandwich panels. Delamination problems are usually treated from a fracture mechanics point of view. However, interface delamination is generally very complex in nature and difficult to solve, because it involves not only geometric and material discontinuities, but also the inherently coupled Mode I, II and III fracture in layered material systems attributed to the well-known oscillatory singularity nature of the stress and displacement field in the vicinity of the delamination crack tip. One of the key issues in this …
Sensitivity Analysis Of The C-130 Sensor Deployment System Arm Using Finite Element Methods, Lawrence Anthony Feragotti
Sensitivity Analysis Of The C-130 Sensor Deployment System Arm Using Finite Element Methods, Lawrence Anthony Feragotti
Graduate Theses, Dissertations, and Problem Reports
The Finite Element Method may be the most powerful tool in the engineer's toolbox today, and can be used in many different applications. The purpose of this thesis is to utilize this tool to optimize the current design of the roll-on roll-off sensor deployment system support arm for the C-130 Hercules. The Department of Defense (DOD) and the National Guard (NG) will be using these sensor pallet systems in a variety of command and control configurations for counter narco-terrorism applications. The original design for the sensor deployment arm will be drawn using CAD, and then a Finite Element Analysis will …
Parametric Modeling And Analysis Of Structural Bonded Joints, Sailaja Malladi
Parametric Modeling And Analysis Of Structural Bonded Joints, Sailaja Malladi
Graduate Theses, Dissertations, and Problem Reports
A closed form model of a double lap bonded joint based on the Hart-Smith Model is considered. An extensional link is added to the inner adherend in order to minimize the magnitude of the shear distribution in the adhesive along the overlap length and equations are formulated for this new model. Various parametric studies are performed on the closed form model to observe their effect on the behavior of the shear stress distribution in the adhesive. Overlap length, stiffness of the extensional link, thickness of the adhesive and stiffness of the adherends are varied in the parametric study.;A 2D finite …
Portable Implementation Of Computer Aided Design Environment For Composite Structures, Santosh Kumar Pagadala E.
Portable Implementation Of Computer Aided Design Environment For Composite Structures, Santosh Kumar Pagadala E.
Graduate Theses, Dissertations, and Problem Reports
Composite materials are widely used due to their low weight, long durability and the ability to tailor their properties to specific design requirements. Their wide range of applications requires a solid understanding of their behavior under different load conditions. The calculations needed for efficient and accurate design of composites could be exhaustive and time consuming. Therefore an efficient computer program which would facilitate effective design becomes a key factor to supporting commercial use of composite materials.;A portable software tool was developed in Java programming environment for design analysis of composite materials. This software tool is superior to its predecessor, the …