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Articles 601 - 630 of 1237
Full-Text Articles in Engineering
Decision Support Systems For Assembly Line Planning -Modular Subsytems For A Large Scale Production Management System, Rahul Renu
All Theses
In the domain of assembly lines, process sheets are entities that carry assembly process descriptions (work instructions), assembly time estimations, product workspaces and other configuration management and control information. These process sheets get assigned to workstations during the process of assembly line balancing. In this research two tools have been developed to aid in the assembly line planning process. In order to ensure that assembly line workers do not intrude upon each other's workspace, two assembly processes operating on the same product workspace must not be assigned to the same station. Generating and maintaining product workspace information for every process …
Noise-Insensitive Prognostic Evaluation Of Historic Masonry Structures, Ashley Haydock
Noise-Insensitive Prognostic Evaluation Of Historic Masonry Structures, Ashley Haydock
All Theses
In recent years, a significant amount of research has been directed towards the development of prognostic methodologies to forecast the future health state of an engineering system assisting condition based maintenance. These prognostic methods, having furthered the maintenance practices for mechanical systems, have yet to be applied to historic masonry structures, many of which stand in an aged and degraded state. Implementation of prognostic methodologies to historic masonry structures can advance the planning of successful conservation and restoration efforts, ultimately prolonging the life of these heritage structures. This thesis presents a review of prognostic concepts and techniques available in the …
Dynamic Transcriptional Response Of Escherichia Coli To Inclusion Body Formation, Faraz Baig
Dynamic Transcriptional Response Of Escherichia Coli To Inclusion Body Formation, Faraz Baig
All Theses
Escherichia coli is used intensively for recombinant protein production due to its many unique advantages, but one key challenge with the use of E. coli is the tendency of recombinant proteins to misfold and aggregate into insoluble inclusion bodies (IBs). The presence of IBs stresses cells and can hinder overall growth. Additionally, IBs contain high concentrations of recombinant protein in an inactive form and thus require recovery steps to salvage functional recombinant protein. Currently, no universally effective method exists to prevent IB formation in recombinant E. coli. Further research into the gene expression response to insoluble recombinant protein may …
Quantifying Annual Bridge Cost By Overweight Trucks In South Carolina, Linbo Chen
Quantifying Annual Bridge Cost By Overweight Trucks In South Carolina, Linbo Chen
All Theses
With the economic development in recent decades, more trucks including overweight trucks are operating on the highways. As a result, many bridges are expected to carry more loads than they did in previous years. The impact of overweight trucks on existing bridges has been an urgent concern for the South Carolina Department of Transportation (SCDOT). There is a pressing need to quantify the annual bridge cost in South Carolina caused by trucks and, in particular, overweight trucks so that the SCDOT and the state legislators can determine the appropriate fee structure for operating overweight trucks. This research focused on quantifying …
Biohydrogen Production By Thermotoga Neapolitana In Agricultural Media, David Morris
Biohydrogen Production By Thermotoga Neapolitana In Agricultural Media, David Morris
All Theses
In this study the production of hydrogen gas by eubacteria Thermotoga neapolitana was investigated. The organism was grown using varying media of cull peach solids and soybean meal. Hydrogen, co-products, and sugar concentrations were observed and compared.
T. neapolitana grew in medium containing peaches and soybean meal as carbon and nitrogen sources, respectively, and produced hydrogen gas. A standard medium containing glucose and yeast extract produced the most hydrogen at 31.5 mmol H2/L-medium. Withholding the vitamins and minerals from the standard the media had a significant effect on hydrogen production reducing the amount of gas produced to 25.8 mmol H2/L-medium. …
Analytical Evaluation Of Adaptive Transmission Protocols For Markov Models Of Channels With Fading And Moderate Shadowing, Sneha Latha Kottapalli
Analytical Evaluation Of Adaptive Transmission Protocols For Markov Models Of Channels With Fading And Moderate Shadowing, Sneha Latha Kottapalli
All Theses
Adaptive transmission protocols are often employed to communicate over wireless channels with fading and other time-varying propagation losses. The protocols compensate for the propagation losses and maintain high throughput by adjusting transmission parameters in response to the channel variations. Performance evaluations for practical adaptive transmission protocols typically require simulation of both the time-varying processes and the procedure by which the protocol derives information about the channel quality. In this thesis, we develop an analytical method to evaluate the performance of two practical protocols, an adaptive coding protocol and an adaptive modulation and coding protocol, which rely on statistics derived from …
The Effect Of Packaging Material Properties On Consumer Food Quality Perception In Quick-Service Restaurants, Emily Thackston
The Effect Of Packaging Material Properties On Consumer Food Quality Perception In Quick-Service Restaurants, Emily Thackston
All Theses
The majority of menu items available in quick-service restaurants (QSR) are consumed directly from a container or package. The main reasons consumers choose to eat fast food are because it is convenient, prepared quickly, a good value, and inexpensive. Therefore, the packaging becomes an integral part of the food product and from a consumer perspective must be consistent with their expectations and motives for choosing to eat fast food. Prior research has directly linked characteristics of consumer food packaging experience to their perception of its contents. The purpose of this research is to determine if consumer quality perception of food …
A Model-Free Approach To Vehicle Stability Control, Chinmay Pandit
A Model-Free Approach To Vehicle Stability Control, Chinmay Pandit
All Theses
This project explored the feasibility of using measured responses of a passenger car together with a fuzzy logic based control algorithm to sense the onset of under-steer (or loss of steering control) and mitigate or eliminate it. The controller is simple and robust and, unlike existing controllers, instead of comparing the vehicle response to that of an idealized model it makes decisions based solely upon the measured response of the car.
Simulations were conducted (using CarSim) of various vehicles executing the skid pad and the double lane change tests to characterize the vehicle behavior. Consistent and qualitatively similar patterns in …
Magnetic Manipulation Of Particles And Cells In Ferrofluid Flow Through Straight Microchannels Using Two Magnets, Jian Zeng
All Theses
Microfluidic devices have been increasingly used in the past two decades for particle and cell manipulations in many chemical and biomedical applications. A variety of force fields have been demonstrated to control particle and cell transport in these devices including electric, magnetic, acoustic, and optical forces etc. Among these particle handling techniques, the magnetic approach provides clear advantages over others such as low cost, noninvasive, and free of fluid heating issues. However, the current knowledge of magnetic control of particle transport is still very limited, especially lacking is the handling of diamagnetic particle. This thesis is focused on the magnetic …
Influence Of Pcb-Contaminated Water Bodies On The Pcb Content Of Riparian Vegetation Through Foliar Deposition, Timothy Matthew Sattler
Influence Of Pcb-Contaminated Water Bodies On The Pcb Content Of Riparian Vegetation Through Foliar Deposition, Timothy Matthew Sattler
All Theses
Polychlorinated biphenyls (PCBs) are a class of persistent organic pollutants that are generally considered semi-volatile. Volatilization and transport of PCBs from contaminated water bodies can result in PCB accumulation on terrestrial plant surfaces, acting as an entry point for contaminants into terrestrial food webs. Evergreen plants can serve as biomonitors of this PCB accumulation, as they often retain foliage for several years, allowing for greater concentrations to accumulate and subsequently be measured. Rhododendron maximum plants often grow in the riparian zone adjacent to water bodies in the Appalachian region, such as near Town Creek, Pickens, South Carolina. This research aimed …
Development Of An Ex Vivo Tissue Testing System For Three Dimensional Biomechanical Analysis Of Abdominal Aortic Aneurysm, Bradley Johns
Development Of An Ex Vivo Tissue Testing System For Three Dimensional Biomechanical Analysis Of Abdominal Aortic Aneurysm, Bradley Johns
All Theses
Abdominal aortic aneurysms (AAA) are localized, progressive dilations of the aortic wall and are the 13th most common cause of death in the United States (~15,000 per year) and surgery is usually recommended when the aneurysm is 5 cm or larger in diameter. Because of this clinical parameter, previous studies of AAA biomechanics have utilized a one-dimensional analysis that focuses solely on changes in wall diameter and have attempted to model geometric changes with mathematical formulas, generally based on the LaPlace equation. This is not sufficient however, as the mechanical behavior of the tissue at sites of aneurysm have been …
Measuring Arousal Through Physiological Responses To Packaging Designs: Investigating The Validity Of Electrodermal Activity As A Measure Of Arousal In A Realistic Shopping Environment, Daniel Hutcherson
All Theses
The validity of electrodermal activity is investigated in the context of packaging design evaluation as a sensitive measure of arousal. Analysts agree that purchasing decisions are subconscious and emotional decisions, contrasted against the popular belief that consumers make purely rational decisions. To understand the personal and rapid character of a consumer's purchasing decisions we must find methods of which to measure and interpret consumer reactions to various packaging designs. Focus groups are discussed as antiquated research methods and new, advanced technologies are outlined as physiological responses. Past literature displays methodological approaches to using electrodermal activity measures in consumer studies, however …
Computational Modeling Of The Friction Stir Welding (Fsw) Process And Of The Performance Of Fsw Joints, Ajay Prasad Arakere
Computational Modeling Of The Friction Stir Welding (Fsw) Process And Of The Performance Of Fsw Joints, Ajay Prasad Arakere
All Theses
Friction Stir Welding (FSW) is a solid-state metal-joining process. Within FSW, a (typically) cylindrical tool-pin (threaded at the bottom and terminated with a circular-plate shape shoulder, at the top) is driven between two firmly-clamped plates (placed on a rigid backing support). Due to a high normal downward pressure applied to the shoulder and due to frictional sliding and plastic-deformation, substantial amount of heat is generated at the tool/work-piece interface and in the region underneath the tool shoulder. Thermally plasticized work-piece material is then extruded around the traveling tool and forged into a welding-joint behind the tool. Due to its solid-state …
Longitudinally Graded Optical Fibers, Alexander Evert
Longitudinally Graded Optical Fibers, Alexander Evert
All Theses
Described herein, for the first time to the best of our knowledge, are optical fibers possessing significant compositional gradations along their length due to longitudinal control of the core glass composition. More specifically, MCVD-derived germanosilicate fibers were fabricated that exhibited a gradient of up to about 0.55 weight percent GeO2 per meter. These gradients are about 1900 times greater than previously reported for fibers possessing longitudinal changes in composition. The refractive index difference is shown to change by about 0.001, representing a numerical aperture change of about 10%, over a fiber length of less than 20 m. The lowest …
Reverse Engineering: Wimax And Ieee 802.16e, Katherine Cameron
Reverse Engineering: Wimax And Ieee 802.16e, Katherine Cameron
All Theses
Wireless communications is part of everyday life. As it is incorporated into new products and services, it brings additional security risks and requirements. A thorough understanding of wireless protocols is necessary for network administrators and manufacturers. Though most wireless protocols have strict standards, many parts of the hardware implementation may deviate from the standard and be proprietary. In these situations reverse engineering must be conducted to fully understand the strengths and vulnerabilities of the communication medium.
New 4G broadband wireless access protocols, including IEEE 802.16e and WiMAX, offer higher data rates and wider coverage than earlier 3G technologies. Many security …
A Regenerative Medicine Approach To Improved Tendon Healing And Repair, Grace Margaret Dion
A Regenerative Medicine Approach To Improved Tendon Healing And Repair, Grace Margaret Dion
All Theses
Surgical repair of torn tendons is a common orthopaedic procedure in the United States, with nearly 400,000 repairs occurring annually. Despite improvements in surgical techniques used to re-attach the tendon to its boney insertion, clinically successful outcomes amongst patients are variable and re-tear rates can be exceedingly high. The use of stem cells as an adjunct to surgical repair to aid in improving tendon healing and repair strength has gained much interest amongst the clinical community. Accordingly, many investigators have begun examining the ability of stem cells to differentiate into tenocytes using various methodologies including the application of growth factors …
Characterization Of Potential Wear Sources In Knee Arthroplasty Prostheses After In Vivo Function, Nicole Durig
Characterization Of Potential Wear Sources In Knee Arthroplasty Prostheses After In Vivo Function, Nicole Durig
All Theses
Total joint arthroplasty (TJA) is a common procedure generally performed in patients with osteoarthritis. While TJA continues to be a successful treatment for degenerative joint disease, there are many studies that demonstrate wear and its sequelae as the major limitation of joint replacement longevity. Previous studies have shown that wear debris originates from four main locations: articulating surfaces, modular component surfaces, surfaces of fixation, and adjuvant fixation devices. Each of these possible wear sources can initiate the cascade of failure associated with wear-induced osteolysis and lead to subsequent revision surgery. The objective of this thesis is to characterize the in …
Modal Analysis To Minimize Gearbox Induced Noise Of General Electric Wind Turbines, Matthew Evans
Modal Analysis To Minimize Gearbox Induced Noise Of General Electric Wind Turbines, Matthew Evans
All Theses
With the current global emphasis on alternative green energy sources, wind turbine technologies have seen significant growth in recent years. Today, wind turbines are being produced and constructed at unprecedented levels with their sites inching closer and closer to residential communities. With that, wind turbine companies have been receiving growing complains about the noise emitted from these turbines during operation. To resolve this issue, many of these companies are spending more resources to design and manufacture quieter wind turbines. In particular, General Electric (GE) intends to reduce the noise created by their 2.5 MW CGDT wind turbines. Previous studies showed …
Laser-Assisted Printing Of Alginate And Cellular Tubes, Jingyuan Yan
Laser-Assisted Printing Of Alginate And Cellular Tubes, Jingyuan Yan
All Theses
Laser-assisted printing such as laser-induced forward transfer (LIFT) has found increasing biofabrication applications as an orifice-free cell/organ printing approach. Unfortunately, there have been very few studies on its efficacy of three-dimensional (3D) printing performance. In addition, the effects of printing parameters on jet/droplet formation during the printing of Newtonian and non-Newtonian fluids are lacking. Therefore, it is important to investigate its printing process and quality. The resulting knowledge will help to better control the resulting printing quality and feature resolution.
The objective of this study is to investigate the feasibility of laser-assisted 3D printing process and its applicability in making …
The Hydraulic Performance Of Perforated Pipe Under-Drains Surrounded By Loose Aggregate, Patrick Murphy
The Hydraulic Performance Of Perforated Pipe Under-Drains Surrounded By Loose Aggregate, Patrick Murphy
All Theses
Perforated pipes are commonly used in the construction industry for subsurface drains. These subsurface drains are installed to intercept and convey infiltrated runoff or groundwater. One common application of perforated pipe is to provide an under-drain for an infiltration trench or porous pavement best management practice (BMP). Perforated pipe is installed into a trench on a bed of aggregate ranging from 0 to 28 cm thick and, depending on the design objective, is laid flat or on a slope. However, the actual hydraulic performance of these pipes, i.e. the stage storage relationship, is poorly understood. The resulting flow is quite …
Improving R-Value In Brick Systems Using Various Pore-Forming Agents, Graham Shepherd
Improving R-Value In Brick Systems Using Various Pore-Forming Agents, Graham Shepherd
All Theses
Energy efficiency and energy savings are two topics that have continued to gain momentum over the last decade. This topic is extremely important when it comes to the construction of buildings and homes. Efforts have been ongoing to increase the insulation value of brick systems to hinder the conductive heat transfer through the material. The use of pore-forming agents (PFA’s) have been studied to increase the porosity within a ceramic system, through sacrificial burnout or place–holder method, which leave a residual, defined pore size distribution. This increase in porosity leads to better insulating capabilities and inherently lower conductivity values. In …
The Effect Of Applying Established Color Theory To Packaging When Visible Product And External Labels Exist Simultaneously, Rachel Randall
The Effect Of Applying Established Color Theory To Packaging When Visible Product And External Labels Exist Simultaneously, Rachel Randall
All Theses
Color is affected by what is around it. A color doesn't necessarily look the same when its placed against two different colored backgrounds (Ryan, William, and Theodore Conover, 2004) Oftentimes, designers are given a blank package and given the task of creating a label or package for the product. What is missing is the product, which can be an integral part of this design process. What is not yet to be determined by current packaging research is how colors work together through the product and package. One way to determine this would be through transparent bottled packages that contain external …
An Experimental Study On The Influence That Failure Number, Specialization, And Domain Have On Confidence In Predicting System Failures, Somaiah Thimmaiah
An Experimental Study On The Influence That Failure Number, Specialization, And Domain Have On Confidence In Predicting System Failures, Somaiah Thimmaiah
All Theses
Design reviews are typically used for three types of design activities: 1) identifying errors, 2) assessing the impact of the errors, and 3) suggesting solutions for the errors. This experimental study focuses on understanding the second issue as it relates to the number of errors considered, the existence of controls, and the level of domain familiarity of the assessor. A set of design failures and associated controls developed for a completed industry sponsored project is used as the experimental design problem. Non-domain individuals (psychology class students), domain generalists (first year engineering students), and domain specialists (graduate mechanical students) are provided …
Parallex File System (Pxfs): Bridging The Gap Between Exascale Processing Capabilities And I/O Performance, Shane Snyder
Parallex File System (Pxfs): Bridging The Gap Between Exascale Processing Capabilities And I/O Performance, Shane Snyder
All Theses
Due to processors reaching the maximum performance allowable by current technology, architectural trends for computer systems continue to increase the number of cores per processing chip to maximize system performance. Most estimates suggest massively parallel systems will be available within the decade, containing millions of cores and capable of exaFlops of performance. New models of execution are necessary to maximize processor utilization and minimize power costs for these exascale systems. ParalleX is one such execution model, which attempts to address inefficiencies of current execution models by exposing fine-grained parallelism, increasing system utilization using asynchronous workflow, and resolving resource contention through …
Post-Market Surveillance Of Total Knee Replacement Combining Clinical Outcomes And Quantitative Image Processing Techniques, Leah Nunez
All Theses
Total knee replacement (TKR) is a successful procedure for the relief of pain, correction of deformity, and restoration of function in patients with knee arthritis.1-3 In the United States, the number of primary TKR surgeries performed in 2030 is projected to be between 2,938,000 to 4,136,000 and revision surgeries between 193,000 to 381,000.4 Osteolysis, pain, and aseptic loosening are the most common causes of revision TKR surgery.5 The purpose of this thesis is to complete assessments for post-market surveillance of total knee replacement (TKR) targeting areas for improving polymer bearings through evaluation of clinical outcomes and analysis of prosthesis retrieved …
A Methodology For Designing Pervious Bicycle Lanes For Stormwater Management, Donald West Iii
A Methodology For Designing Pervious Bicycle Lanes For Stormwater Management, Donald West Iii
All Theses
Bicycles have proven to be an efficient and reliable form of transportation in urban settings. Therefore, the addition of bicycle lanes into the transportation network could significantly impact and improve the sustainability of our infrastructure by reducing greenhouse emissions and improving the health of individuals who cycle on a regular basis. Pervious pavements are an approved (LID) strategy that could potentially be used to construct these new facilities thereby reducing the quantity of stormwater runoff and improving the water quality. Practicing engineers need both a design aid and research supported methods for designing these improvements before they can be fully …
Three-Dimensional Finite Element Analysis Of Sound Transmission Performance Of Honeycomb Sandwich Structures, Xin Wang
All Theses
Due to the lighter weight of honeycomb structures compared with a cuboid of similar material, honeycomb is widely used in applications requiring a high stiffness to weight ratio. One important honeycomb meta-structure is sandwich composites designed with a honeycomb core between two thin panel layers. The geometry of the honeycomb is formed from periodically spaced, non-overlapping unit cells. An important advantage of cellular materials such as honeycomb is that vibration and acoustic properties can be changed simply by changing the unit cell geometry variables such as included angle, cell wall thickness and length, while keeping the overall dimensions of the …
Vibration And Acoustic Properties Of Honeycomb Sandwich Structures Subject To Variable Incident Plane-Wave Angle Pressure Loads, Jiaxue Yan
All Theses
Honeycomb structures are widely used in many areas for their material characteristics such as high strength-to-weight ratio, stiffness-to-weight, sound transmission, and other properties. Honeycomb structures are generally constructed from periodically spaced tessellations of unit cells. It can be shown that the effective stiffness and mass properties of honeycomb are controlled by the local geometry and wall thickness of the particular unit cells used. Of particular interest are regular hexagonal (6-sided) honeycomb unit cell geometries which exhibit positive effective Poisson's ratio, and modified 6-sided auxetic honeycomb unit cells with Poisson's ratio which is effectively negative; a property not found in natural …
Numerical Study Of The Structural Performance Of Large Panelized All-Wood Roof Diaphragms, Sami Pant
Numerical Study Of The Structural Performance Of Large Panelized All-Wood Roof Diaphragms, Sami Pant
All Theses
The use of flexible roof diaphragms is very common in the United States, both for multi-family residential buildings and large-scale commercial buildings. Due to its simplicity, the traditional diaphragm design method is commonly used in diaphragm design, in particular for the design of diaphragms with relatively small dimensions. The traditional diaphragm design method assumes the axial forces developed in framing members under in-plane loading carried only by the perimeter chords. The traditional diaphragm design method has always been thought to be a conservative design method, especially when applied to large diaphragms. In recent years, the engineering community began to question …
College Level Residential Building Code Education: Current Status And Best Practice, Earl Shealy
College Level Residential Building Code Education: Current Status And Best Practice, Earl Shealy
All Theses
Community destruction and loss of life due to residential building code (RBC) violations still occur too frequently. Increasing RBC enforcement is often not possible due to lack of funds and resources. Teaching RBC to college-level construction students is another way to encourage greater code compliance and enhanced community resilience. This research assesses the current status of RBC education in accredited construction programs, identifies academic and industry perspectives of RBC education, and constructs 'best practice' RBC teaching strategies.
A mix method, exploratory approach including three distinct phases explains the current phenomenon - RBC education emphasis within university curriculums. My research found …