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Articles 1081 - 1110 of 1237
Full-Text Articles in Engineering
Fpga Acceleration Of A Cortical And A Matched Filter-Based Algorithm, Kenneth Rice
Fpga Acceleration Of A Cortical And A Matched Filter-Based Algorithm, Kenneth Rice
All Theses
Digital image processing is a widely used and diverse field. It is used in a broad array of areas such as tracking and detection, object avoidance, computer vision, and numerous other applications. For many image processing tasks, the computations can become time consuming. Therefore, a means for accelerating the computations would be beneficial. Using that as motivation, this thesis examines the acceleration of two distinctly different image processing applications. The first image processing application examined is a recent neocortex inspired cognitive model geared towards pattern recognition as seen in the visual cortex. For this model, both software and reconfigurable logic …
Flow Boiling Of Acetone In Parallel Rectangular Mini-Channels, Rafael Zimmermann
Flow Boiling Of Acetone In Parallel Rectangular Mini-Channels, Rafael Zimmermann
All Theses
Recent miniaturization of cooling systems has demanded better designing tools for compact heat exchangers. Forced two-phase flow through small channels is an effective way to better performance in a limited space. However, the characteristics of flow boiling in small channels differ from those in regular size channels, prompting a need for better understanding and development of predictive tools.
The characteristics of flow boiling in compact heat exchangers with parallel rectangular mini-channels of cross sections 0.50 x 0.50 mm, 0.75 x 0.75 mm, 1.00 x 1.00 mm, and 1.50 x 1.50 mm were experimentally investigated. Acetone was the fluid of choice, …
Stability Analysis And Decentralized Control Of Coupled Oscillators With Feedback Delays, Saurabh Keni
Stability Analysis And Decentralized Control Of Coupled Oscillators With Feedback Delays, Saurabh Keni
All Theses
Most dynamic systems do not react instantaneously to actuation signals. The temporal evolution of some others is based on retarded communications or depends on information from the past. In such cases, the mathematical models used to describe these systems must include information about the past dynamics of the states. These models are often referred to as delay or retarded systems. Delays could channel energy in and out of a system at incorrect time intervals producing instabilities and rendering controllers' performance ineffective.
The purpose of this research is two folds. The first investigates the effect of inherent system delays on the …
Topology And Free-Size Optimization With Multiple Loading Conditions For Light Weight Design Of Die Cast Automotive Backrest Frame, Sreeram Polavarapu
Topology And Free-Size Optimization With Multiple Loading Conditions For Light Weight Design Of Die Cast Automotive Backrest Frame, Sreeram Polavarapu
All Theses
Automotive seats provide comfort and safety to the occupant travelling in the vehicle. An optimized seat design should be aesthetically pleasing, lightweight and meet the safety requirements. An automotive seat with occupant is subjected to various kinds of forces in the event of crash and should be designed for strength and stiffness as measured by stress and strain, and deflection. In this work, finite element analysis, together with topology and free-size optimization is used to design a lightweight die cast automotive front seat backrest frame when subjected to loads prescribed by ECE R17 European government regulations and additional loads which …
Investigation Of The Discharge Coefficient For Circular Orifices In Riser Pipes, David Prohaska
Investigation Of The Discharge Coefficient For Circular Orifices In Riser Pipes, David Prohaska
All Theses
The purpose of this study is to examine the discharge coefficient as it pertains to
flow through a circular orifice cut into a thin-walled vertical riser pipe. Perforated riser
pipes are a popular outlet control structure for stormwater detention basins. These
basins are used to store and release stormwater runoff from impervious areas of
developed sites. Federal, state, and local regulatory agencies provide requirements for
the quality of stormwater runoff, as well as the maximum peak discharges from a
developed site. Accurately determining the flow rate from a perforated vertical riser
pipe is crucial to meeting these requirements and protecting …
Computational Analysis Of Feasibility And Utility Of Direct-Adhesion Polymer-To-Metal Hybrid Technologies For Use In Load Bearing Body-In-White Automotive Components, Vijay Sellappan
All Theses
Traditionally, metals and plastics are fierce competitors in many automotive engineering applications. This paradigm is gradually being abolished as the polymer-metal-hybrid (PMH) technologies, developed over the last decade, are finding ways to take full advantage of the two classes of materials by combining them into a singular component/sub-assembly. By employing one of the several patented PMH technologies, automotive original equipment manufacturers (OEMs) have succeeded in engaging flexible assembly strategies, decreasing capital expenditures and reducing labor required for vehicle manufacture. The basic concept utilized in all PMH technologies is based on the fact that while an open-channel thin-wall sheet-metal component can …
Compliant Multi-Link Vehicle Suspensions, Souharda Raghavendra
Compliant Multi-Link Vehicle Suspensions, Souharda Raghavendra
All Theses
One of the goals of automotive lightweight engineering is to achieve reduction in mass, cost, and complexity of vehicle components, subsystems and systems without sacrificing functionality and expected performance. This thesis addresses functionally integrated suspension systems that could lead to reduction in part count and mass and save packaging space. It deals with the analysis of multi-link suspensions that combine the function of energy storage and the mechanism of wheel location and guidance within individual compliant links and members.
To explore possibilities, a generic kinematic model of an independent five-link suspension was built in the MSC.ADAMS multi-body dynamics simulation environment. …
Biomechanical Evaluation Of Two Methods Of Humeral Shaft Fixation, Joshua Catanzarite
Biomechanical Evaluation Of Two Methods Of Humeral Shaft Fixation, Joshua Catanzarite
All Theses
Biomechanical evaluations of fracture fixation devices attempt to determine implant performance by approximating the in vivo conditions. This performance is affected by many factors and relies on the complex bone-implant interface. Biomechanical tests can be designed in a variety of ways in order to evaluate device performance with respect to any number of these bone-implant interactions. Standardized tests, designed by groups such as the American Society for Testing and Materials (ASTM), are often designed either to determine the performance of a specific type of fixation device or for direct comparison between different devices. Additionally, many biomechanical evaluations are designed for …
Autonomous Navigation And Mapping Using Monocular Low-Resolution Grayscale Vision, Vidya Murali
Autonomous Navigation And Mapping Using Monocular Low-Resolution Grayscale Vision, Vidya Murali
All Theses
Vision has been a powerful tool for navigation of intelligent and man-made systems ever since the cybernetics revolution in the 1970s. There have been two basic approaches to the navigation of computer controlled systems: The self-contained bottom-up development of sensorimotor abilities, namely perception and mobility, and the top-down approach, namely artificial intelligence, reasoning and knowledge based methods. The three-fold goal of autonomous exploration, mapping and localization of a mobile robot however, needs to be developed within a single framework. An algorithm is proposed to answer the challenges of autonomous corridor navigation and mapping by a mobile robot equipped with a …
Quantifying Antalgic Gait Knee Function Using Inertial Sensor Technology, William Mostertz
Quantifying Antalgic Gait Knee Function Using Inertial Sensor Technology, William Mostertz
All Theses
The use of body-fixed inertial sensors to analyze human movement may prove useful in the medical field. Improving orthopaedic device design, diagnosing musculoskeletal disorders, and rehabilitation assessment could all benefit from a mobile gait analysis system based on inertial sensors. More specifically, patients recovering from lower limb corrective surgeries tend to adjust gait patterns to accommodate pain, a condition referred to as antalgic gait. Currently there is no quantitative method available to assess recovery for this patient population during post-operative management. A comparison of the inertial sensor system with the camera-based industry standard has confirmed it as a viable method …
Person Detection And Tracking Using Binocular Lucas-Kanade Feature Tracking And K-Means Clustering, Christopher Dunkel
Person Detection And Tracking Using Binocular Lucas-Kanade Feature Tracking And K-Means Clustering, Christopher Dunkel
All Theses
In this thesis, we present the design and implementation of a method for real-time person detection and tracking. Many current methods for detecting and tracking people rely on color contrast or movement to segment the image. Using color, however, requires the target and the background to be significantly different, and motion segmentation requires the target to be in constant motion relative to the background, often requiring stationary cameras. Pattern detection methods have also been applied to the problem of detecting pedestrians, but these approaches are slower and require stationary cameras to function. The method we present in this work does …
Investigation Of The Effects Of Aggregate Properties And Gradation On Pervious Concrete Mixtures, Andrew Neptune
Investigation Of The Effects Of Aggregate Properties And Gradation On Pervious Concrete Mixtures, Andrew Neptune
All Theses
Pervious concrete is a concrete mixture prepared from cement, aggregates, water, little or no fines and in some cases admixtures. It has been considered a Best Management Practice by the EPA because of its ability to reduce storm water runoff and to initiate the filtering of pollutants. Because the hydrologic properties of pervious concrete has been the primary reason for its reappearance in construction, the focus of previous research has been on maximizing the drainage properties of the mix with single-sized aggregates. This research, however, investigates the effects of aggregate properties and gradation on the strength, as well as hydrologic …
Channel-Access And Routing Protocols To Utilize Multiple Heterogeneous Channels For Ad Hoc Networks, Crystal Jackson
Channel-Access And Routing Protocols To Utilize Multiple Heterogeneous Channels For Ad Hoc Networks, Crystal Jackson
All Theses
In this thesis, we consider a multi-channel ad hoc network employing frequency-agile radios that utilize direct-sequence spread-spectrum signaling. Two of the key distributed protocols for this type of network control channel access and routing. The channel-access protocol is responsible for controlling access to the channels available to the terminals in the network, and the routing protocol determines how packets are forwarded among the terminals in the network. To achieve reliable and efficient network performance, these protocols should cooperate with one another and take advantage of the multiple channels available to the network.
In this thesis, we investigate a number of …
The Electrical Characterization Of Tantalum Capacitors As Mis Devices, Brian Holman
The Electrical Characterization Of Tantalum Capacitors As Mis Devices, Brian Holman
All Theses
Electrical characteristics of a new class of tantalum capacitor are presented. Specifically, this type of tantalum capacitor is manufactured by KEMET Electronics Corporation and utilizes Poly(3,4-ethylenedioxythiolphene) (PEDOT) as the cathode material. There are two capacitor varieties based on the polymerization method used for the PEDOT. One uses In-Situ polymerization, and the other uses Pre-Polymerization. Existing polymer Ta capacitors use In-Situ polymerization while Pre-Polymerization is a new technique of cathode application. We investigated both types of devices to determine what, if any, performance benefits were gained by using Pre-Poly.
In a basic form Ta capacitors consist of a Ta anode, Ta2O5 …
Optimization And Characterization Of Biodiesel Production From Cottonseed And Canola Oil, Hem Joshi
Optimization And Characterization Of Biodiesel Production From Cottonseed And Canola Oil, Hem Joshi
All Theses
Transesterification of cottonseed oil and canola oil was carried out using low molecular weight alcohols and potassium hydroxide. For cottonseed oil, a central composite design with eight factorial, six center and six axial points was used to study the effect of catalyst concentration, molar ratio of ethanol to cottonseed oil and reaction temperature on percentage yield and percentage initial absorbance (%A385nm) of the biodiesel. Catalyst concentration and molar ratio of ethanol to cottonseed oil were the most influential variables affecting percentage conversion and percentage initial absorbance. Maximum percentage yield of 98 % is predicted at a catalyst concentration of 1.07 …
Protein Interactions With Mixed Poly(Ethylene Glycol)/Polyacrylic Acid Brushes, Zhenqing Li
Protein Interactions With Mixed Poly(Ethylene Glycol)/Polyacrylic Acid Brushes, Zhenqing Li
All Theses
Tethered polymer chains that are grafted to a solid substrate by one chain end (polymer brushes) may be distinguished from other anchored polymer layers by the relatively high grafting densities gained. Potential uses of polymer brushes for interfacial modification to regulate interactions between proteins and substrates, such as drug delivery and protein separation, are widely recognized. Therefore, it is important to investigate interactions between proteins and surfaces modified with a polymer brush.
In this study, the 'grafting-to' method has been used to graft mixed poly(ethylene glycol) (PEG) and polyacrylic acid (PAA) brushes onto poly(glycidyl methacrylate) (PGMA)-modified silicon wafers/glass slides to …
A Laboratory Study On The Effects Of Submerged Vertical And Semicircular Breakwaters On Near-Field Hydrodynamics And Morphodynamics, David Young
All Theses
A laboratory study is presented herein that investigates the effects of submerged vertical and semicircular breakwaters on near-field hydrodynamics and morphodynamics. Breakwaters are employed worldwide in order to reduce destructive wave forces often imparted on vulnerable shorelines; a task partially completed by reflecting incident wave energy back out to sea. However, two common side-effects of their function are the occurrence of scour at the breakwater, which can lead to structural problems; and offshore ripple formations, which are influential in scour protection failure and sediment transport patterns. This study aims to determine a relationship between breakwaters and the wave reflection coefficient …
Real-Time Power Management Of A Fuel Cell/Ultracapacitor Hybrid, Wesley Greenwell
Real-Time Power Management Of A Fuel Cell/Ultracapacitor Hybrid, Wesley Greenwell
All Theses
This thesis presents the system architecture design, system integration methodology, and real-time control of a fuel cell/ultracapacitor hybrid power system. The main objective is for the hybrid system to respond to real-world fluctuations in power without negatively impacting fuel cell life.
A Proton Exchange Membrane (PEM) Fuel Cell is an electrochemical device which converts the chemical energy of pure hydrogen into electricity through a chemical reaction with oxygen. The high conversion efficiency, zero harmful emissions, high power-to-weight ratio, scalability, and low temperature operation make PEM fuel cells very attractive for stationary and portable power applications. However, fuel cells are limited …
Development Of A Colorimetric Test For Quantification Of Uranium In Drinking Water, Amy Ratliff
Development Of A Colorimetric Test For Quantification Of Uranium In Drinking Water, Amy Ratliff
All Theses
A new method was developed for the determination of uranium in groundwater above 30µg/L (30ppb). This concentration is the maximum contaminant level (MCL) for uranium in drinking water, which was set in December 2003 by the US EPA under the provisions of the Safe Drinking Water Act. The method is rapid and requires little technical training to conduct, allowing it to be used by consumers, in the laboratory, or in the field. The two-step technique involves preconcentrating uranium using a U/TEVA-2 extraction chromatographic resin followed by complexation with a pyridylazo indicator dye, Br-PADAP. At neutral pH, a counter ion is …
Geotechnical Investigations At Three Sites In The South Carolina Coastal Plain That Did Not Liquefy During The 1886 Charleston Earthquake, Ronald Boller
All Theses
Geotechnical investigations were performed at three sites in the South Carolina Coastal Plain where liquefaction is believed to not have occurred in 1886 or during other Holocene earthquakes. The three sites are the Coastal Research and Education Center (CREC) located near Charleston, and the Borrow Pit and Marsh Road sites at Hobcaw Barony near Georgetown. The investigations consisted of nine seismic cone penetration test (SCPT) soundings, three non-seismic cone penetration test (CPT) soundings, one standard penetration test (SPT) boring, and two dilatometer test (DMT) soundings. Shear wave velocities (Vs) were calculated from the SCPTs using pseudo interval measurements at the …
Computational Method For Solving Spoke Dynamics On High Speed Rolling Tweel, Kranti Kiran Manga
Computational Method For Solving Spoke Dynamics On High Speed Rolling Tweel, Kranti Kiran Manga
All Theses
Extensive studies have been conducted in the past to show that the characteristics of a non-pneumatic structure, the TweelTM are the same as the pneumatic tires. These characteristics include low contact pressure, low stiffness, low energy loss from obstacle impacts, low mass, and high load-carrying capacity. The TweelTM consists of a ring shaped shear beam comprised of two inextensible membranes separated by a relatively low modulus elastic material. This shear beam is connected to the hub by thin elastic spokes.
When used for high speed rolling applications, the TweelTM produces unacceptably high levels of acoustic noise. It has been suggested …
Random Road Analysis And Improved Gear Ratio Selection Of A Front Wheel Drive Drag Racing Car, Thomas New
Random Road Analysis And Improved Gear Ratio Selection Of A Front Wheel Drive Drag Racing Car, Thomas New
All Theses
Drag racing has been around since the 1950's and has become a very popular and very competitive sport. The difference between winning and losing can be hundredths and even thousandths of a second. Drag racing teams need every advantage they can get in order to excel in their field. On-track testing is very expensive and can consume large amounts of time and resources that a race team may not be able to afford.
One way to address this potential problem of high cost is by using computer simulation to show how your drag race car may perform at different tracks …
Immobilization Of Biomolecules On Polymer Scaffolds: A Novel Approach, Joshua Barringer
Immobilization Of Biomolecules On Polymer Scaffolds: A Novel Approach, Joshua Barringer
All Theses
In this thesis, I describe the successful development of a procedure for the step-by-step formation of a multi-layer polymer scaffold on a silicon wafer and the characterization of these materials. Also discussed is the development of a procedure for the non-site specific attachment of a biomolecule to the modified silicon wafer, including scaffolds modified via drop-on-demand, DOD, inkjet printing. Ellipsometry, x-ray photoelectron spectroscopy (XPS), FTIR, fluorometry, and static water contact angle measurements are used to study the nanoscale structure and properties of the interfacial, thin film-modified surfaces. Polymers based on 2-vinyl-4,4-dimethylazlactone (VDMA) are used as the platform onto which biomolecules …
Analysis And Experiments For Tendril-Type Robots, Lara Cowan
Analysis And Experiments For Tendril-Type Robots, Lara Cowan
All Theses
New models for the Tendril continuous backbone robot, and other similarly constructed robots, are introduced and expanded upon in this thesis. The ability of the application of geometric models to result in more precise control of the Tendril manipulator is evaluated on a Tendril prototype. We examine key issues underlying the design and operation of 'soft' robots featuring continuous body ('continuum') elements. Inspiration from nature is used to develop new methods of operation for continuum robots. These new methods of operation are tested in experiments to evaluate their effectiveness and potential.
Ductile-Regime Machining Of Glass Using The Micromilling Process, Kevin Foy
Ductile-Regime Machining Of Glass Using The Micromilling Process, Kevin Foy
All Theses
Glass is a homogeneous material with amorphous crystal structure that is produced through the rapid cooling of its molten state below the glass transition temperature. Glass exhibits many excellent mechanical and physical properties, and it is widely used in automotive, communications, optics, electronics, architectural, and biomedical industries. For certain applications such as DNA microarrays, glass components with microfeatures are typically produced using a combination of photolithography and etching processes, which is generally time consuming and can involve hazardous chemicals. It would be ideal to fabricate some glass devices through mechanical micromachining for some rapid prototyping applications of glass-based devices, but …
Storm Water Export Of Nitrogen, Phosphorous, And Carbon From Developing Catchments In The Upper Piedmont Physiographic Province, Laura Reid
All Theses
Impacts on water quality caused by land use change from forests and pastures to housing subdivisions were evaluated in catchments undergoing active development in the upper Piedmont physiographic province of South Carolina. Specific attention was focused on the export of nitrogen, phosphorus and carbon from these catchments during storm events. Three catchments with varying stages of development were compared to categorize the effects of land disturbance. Storm events occurring within a four year period of 2004 through 2007 were studied for changes in water quality within catchment streams. Due to the potential large input of surface runoff to streams following …
Analysis Of The Impact Of Fuel Price And Bidding Volume On The Engineer's Estimate, Greaton Sellers
Analysis Of The Impact Of Fuel Price And Bidding Volume On The Engineer's Estimate, Greaton Sellers
All Theses
The research project 'Analysis of the Impact of Fuel Price and Bidding Volume on the Engineer's Estimate' was initiated by the South Carolina Department of Transportation and conducted by Clemson University. This research was executed as a two part study, 'Best Practices for Developing the Engineer's Estimate', which addressed two distinct but related objectives. The first research objective was to fully explore the advantages and disadvantage of alternative methodologies utilized to compile the engineer's cost estimate. This research objective is addressed in Report Volume I. The second research objective, which is addressed in this Report Volume II, was to develop …
Investigating The Role Of Prototyping In Mechanical Design Using Case Study Validation, David Stowe
Investigating The Role Of Prototyping In Mechanical Design Using Case Study Validation, David Stowe
All Theses
The purpose of this research is to explore the application of prototyping in the design process through a case study analysis using structured interviews, an ethnographic study, and documents analysis, to determine what factors and practices result in successful prototyping. In doing so, research questions are established, a prototyping process is developed to assist the investigation, and classification systems are created to organize data collected in the study. As part of the case study, an interview is formulated to answer the proposed research questions and a literature survey of prototyping in design is used to create a larger analytical foundation. …
Synthesis And Dielectric Properties Of Nanocrystalline Barium Titanate And Silver/Barium Titanate Particles, Hiroki Maie
Synthesis And Dielectric Properties Of Nanocrystalline Barium Titanate And Silver/Barium Titanate Particles, Hiroki Maie
All Theses
The increasing needs for further functionality, higher performance, and miniaturization of electronic devices have highly demanded down-size and volume-efficiency of electronic components such as multilayer ceramic capacitors (MLCCs). To meet this demand, the use of high dielectric constant material with nanometer size and spherical shape is considered as requirements. Embedded capacitors are an important emerging technology for meeting the performance and functionality requirements of next-generation electronic devices. One major obstacle for implementing this technology is the scarcity of dielectric materials with appropriate dielectric and mechanical properties was mainly discussed
Considering these backgrounds, this research is devoted to synthesis of high …
Factors Affecting The Performance Of Brick Veneer Construction, Jocelyn Dickie
Factors Affecting The Performance Of Brick Veneer Construction, Jocelyn Dickie
All Theses
The first topic focused on in this report is the height restriction imposed by the masonry standard for brick veneer on wood frame backing. The current US standard (ACI 530-05/ASCE 5-05/TMS 402-05 Building Code Requirements for Masonry Structures) does not allow brick veneer to extend more than thirty feet above the foundation when supported by wood framing. These prescriptive requirements are compared with those of the Canadian (CSA 304.1-04) and Australian (AS 3700-2001) masonry standards. The logic found for this height restriction is based on the vertical differential movement caused by moisture and thermal expansion of the brick veneer and …