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Articles 6841 - 6870 of 11510
Full-Text Articles in Engineering
A Comparative Study Of Strength And Stiffness Of Thin-Walled Specimens Fabricated By Fdm And 3d Printing Technologies, Miranda Rodrigo
A Comparative Study Of Strength And Stiffness Of Thin-Walled Specimens Fabricated By Fdm And 3d Printing Technologies, Miranda Rodrigo
Theses and Dissertations
Rapid Prototyped part failure constitutes a major issue for both RP providers and customers. When parts fail the reputation of the vendor is heavily deteriorated, customer dissatisfaction increase and replacement of the broken parts is often necessary to avoid the loss of future business. Product design teams often run into situations where Rapid Prototyped parts are not able to withstand shipping and handling and delivered broken or while demonstrating and examining the parts. When done in the face of customers this builds a perception of poor quality and lack of aptitude on the design group as well as the RP …
A Server-Based Tool For Automating Modflow Simulations For Well Permitting Decision Support, David J. Jones
A Server-Based Tool For Automating Modflow Simulations For Well Permitting Decision Support, David J. Jones
Theses and Dissertations
Numeric groundwater modeling techniques can assist water resources regulators pursuing prudent and foresightful aquifer management decisions. Unfortunately, the amount of time and professional expertise required to wield modern groundwater models often exceeds the resources of regulating agencies – even for simple modeling tasks that are repetitive in nature. In an effort to increase the accessibility of groundwater modeling resources, a server-based automated well permitting decision support system was designed. The prototype system allows a user to 1) input properties for any number of candidate wells, 2) execute an associated MOFLOW model, and 3) view relevant results of the simulation on …
Improved Methods For Phased Array Feed Beamforming In Single Dish Radio Astronomy, Michael James Elmer
Improved Methods For Phased Array Feed Beamforming In Single Dish Radio Astronomy, Michael James Elmer
Theses and Dissertations
Among the research topics needing to be addressed to further the development of phased array feeds (PAFs) for radio astronomical use are challenges associated with calibration, beamforming, and imaging for single dish observations. This dissertation addresses these concerns by providing analysis and solutions that provide a clearer understanding of the effort required to implement PAFs for complex scientific research. It is shown that calibration data are relatively stable over a period of five days and may still be adequate after 70 days. A calibration update system is presented with the potential to refresh old calibrators. Direction-dependent variations have a much …
Culvert Roughness Elements For Native Utah Fish Passage: Phase Ii, Suzanne Kim Monk
Culvert Roughness Elements For Native Utah Fish Passage: Phase Ii, Suzanne Kim Monk
Theses and Dissertations
Native fishes have become an increasingly important concern when designing fish passable culverts. Many operational culverts constrict waterways which increase velocities and prevent upstream passage of small fish species. The current method to ensure fish passage is to match the average cross sectional velocity to the sustained swim speed of the fish. This study investigates the passage rates of leatherside chub (Lepidomeda aliciae) and speckled dace (Rhinichthys osculus) at three sites (an arch culvert with substrate bottom, box culvert with bare bottom, and a stream section with no culvert) located on Salina Creek near Salina, UT. It was found that …
Design And Optimization Of A Miniature Radiation Pattern Reconfigurable Antenna For 2.4 Ghz Band And A Dual Tuned Birdcage Coil For Magnetic Resonance Imaging, Manoj Adhikari
Theses and Dissertations
This thesis describes development of a miniature reconfigurable antenna and optimization of a dual tuned birdcage coil. The design goals for the miniature reconfigurable antennas are resonance center frequency of 2.44 GHz, bandwidth of 2.4 GHz - 2.48 GHz, size of 0.8 cm x 1.2 cm, radiation efficiency of 70%, pattern correlation coefficient of 0.3 and input impedance of 50 Ω. The main goals to be achieved from the birdcage coil are the better homogeneity and higher signal to noise ratio than the existing coil. The design and optimization of both antenna and birdcage coil were done using simulation software …
Characterization And Preliminary Demonstration Of Microcantilever Array Integrated Sensors, Ryan R. Anderson
Characterization And Preliminary Demonstration Of Microcantilever Array Integrated Sensors, Ryan R. Anderson
Theses and Dissertations
I characterize the behavior of microcantilever arrays which utilize the in-plane photonic transduction that I've previously developed and evaluate the performance of the microcantilever arrays in simple sensing scenarios with integrated microfluidics. First the thermal responses of microcantilevers with a variety of patterns of deposited gold films are compared. Using a scanning electron microscope, I observe the deflection thermal sensitivities of 300 µm long microcantilevers to be -170.82 nm/K for a full gold coating and -1.93 nm/K for no gold coating. Using the photonic transduction method I measure a thermal sensitivity of -1.46 nm/K for a microcantilever array with no …
Development And Initial Validation Of An Innovation Assessment, Jacob D. Wheadon
Development And Initial Validation Of An Innovation Assessment, Jacob D. Wheadon
Theses and Dissertations
In the past two decades, there has been an increased demand for more innovative individuals and organizations. In response to this need, a number of groups have begun to teach innovation courses to improve people's innovation skills. While many of these groups report success in helping people become more innovative, there is no way to test the effectiveness of the innovation courses. This study describes the development and initial validation of an innovation test instrument. It demonstrates how the author identified the content domain of the test and created test items. Then it describes initial validation testing of the instrument. …
Analytical Thermal Model Of Friction Stir Welding With Spatially Distributed Heat Source, Gordon Scott Reese
Analytical Thermal Model Of Friction Stir Welding With Spatially Distributed Heat Source, Gordon Scott Reese
Theses and Dissertations
Friction stir welding (FSW) has been studied extensively for the past two decades. Thermal modeling has been of particular interest, as the quality of the weld is dependent upon the temperature history of the work piece during the process. Since direct temperature measurements of the welded zone are not possible, an analytical model was developed to predict the temperature in this area. This model requires parameters that cannot be easily experimentally determined, so a best fit for these parameters was acquired via regression analysis by comparing the model to experimental data acquired outside of the weld zone. The model was …
Measurement And Analysis Of Gas Composition In A Staged And Unstaged Oxy-Fired Pulverized Coal Reactor With Warm Flue Gas Recycle, Skyler Charles Chamberlain
Measurement And Analysis Of Gas Composition In A Staged And Unstaged Oxy-Fired Pulverized Coal Reactor With Warm Flue Gas Recycle, Skyler Charles Chamberlain
Theses and Dissertations
Nearly half of the electrical power produced in the United States is generated with coal. Coal power is inexpensive and reliable, but coal combustion releases harmful pollutants including NOx and SOx into the atmosphere if not controlled. CO2, a greenhouse gas, is also released during coal combustion and may contribute to global warming. A promising technology enabling carbon capture is oxy-coal combustion. During oxy-combustion, coal is burned in an atmosphere of O2 and recycled flue gas to eliminate nitrogen which makes up the majority of air-combustion flue gas. Oxy-combustion flue gas is mainly composed of CO2 and H2O. H2O can …
Design And Polarimetric Calibration Of Dual-Polarized Phased Array Feeds For Radio Astronomy, Taylor D. Webb
Design And Polarimetric Calibration Of Dual-Polarized Phased Array Feeds For Radio Astronomy, Taylor D. Webb
Theses and Dissertations
Research institutions around the globe are developing phased array feed (PAF) systems for wide-field L-band radio astronomical observations. PAFs offer faster survey speeds and larger fields of view than standard single-pixel feeds, which enable rapid sky surveys and significantly increased scientific capability. Because deep space astronomical signals are inherently weak, PAF systems must meet stringent noise and sensitivity requirements. Meeting these requirements requires detailed modeling of the phased array itself as well as the reflector it is mounted on. This thesis details a novel approach to dual-pol PAF design that models the array and reflector as a complete system in …
Modeling Of Complex Pentahedron Solar Still Covers To Optimize Distillate, Jeremy D. Lefevre
Modeling Of Complex Pentahedron Solar Still Covers To Optimize Distillate, Jeremy D. Lefevre
Theses and Dissertations
This work shows the results of modeling and optimizing pentahedron-shaped covers for application on a passive solar still. While modeling under the assumption of clear weather in Provo, Utah, United States of America, it was found that two main geometries resulted: A single slope still with fully vertical back and sidewalls and a south face tilted at 37.1°, absorbing a total of 8.98 megajoules of direct solar radiation. A half-pyramid shaped cover with vertical backwall, sidewalls tilted in at 60.6°, and a south face tilted in at 41.5°, absorbing 9.34 megajoules of direct solar radiation.With improved covers, solar radiation absorbed …
Liquid Dielectric Spectroscopy And Protein Simulation, Brett Lee Mellor
Liquid Dielectric Spectroscopy And Protein Simulation, Brett Lee Mellor
Theses and Dissertations
Protein electrical properties have been studied using dielectric relaxation measurements throughout the past century. These measurements have advanced both the theory and practice of liquid dielectric spectroscopy and have contributed to understanding of protein structure and function. In this dissertation, the relationship between permittivity measurements and underlying molecular mechanisms is explored. Also presented is a method to take molecular structures from the Protein Data Bank and subsequently estimate the charge distribution and dielectric relaxation properties of the proteins in solution. This process enables screening of target compounds for analysis by dielectric spectroscopy as well as better interpretation of protein relaxation …
Three Dimensional Characterization Of Vocal Fold Fluid Structure Interactions, Joseph R. Nielson
Three Dimensional Characterization Of Vocal Fold Fluid Structure Interactions, Joseph R. Nielson
Theses and Dissertations
Voice quality is strongly linked to quality of life; those who suffer from voice disorders are adversely affected in their social, family, and professional relationships. An effort has been made to more fully understand the physics behind how the voice is created, specifically the fluid structure interactions that occur during vocal fold vibration. Many techniques have been developed and implemented to study both the motion of the vocal folds and the airflow that creates the motion. Until recently these techniques have sought to understand a highly three-dimensional phenomenon with 1D or 2D perspectives.This research focuses on the development and implementation …
Investigation Of Internal Wave Spectra Due To Observed Interactions, Benjamin Lee Hillyard
Investigation Of Internal Wave Spectra Due To Observed Interactions, Benjamin Lee Hillyard
Theses and Dissertations
Observational data are analyzed and decomposed to reveal internal ocean waves and their interactions with one another. Particularly, the interaction of small-scale internal waves with a large inertia wave packet is examined. Using the governing internal wave equations, an analysis is made of the energy propagation of a small scale internal wave with a large-scale inertia wave. With that, an assessment is made of the frequency of occurrence of various encounter types. Next, the possibility of energy transfer during an interaction is explored. The relative energy of the small wave before interacting with the large-scale inertia wave is calculated and …
Discrete-Time Implementation, Antenna Design, And Mimo For Near-Field Magnetic Induction Communications, Ronald Brett Gottula
Discrete-Time Implementation, Antenna Design, And Mimo For Near-Field Magnetic Induction Communications, Ronald Brett Gottula
Theses and Dissertations
Near-field magnetic induction (NFMI) is a short range wireless technology that uses loop antennas coupled by a magnetic field. NFMI antennas are electrically small and thus extremely inefficient and narrow band, making system design for multi-user and high-bitrate applications challenging. The goals of this thesis are to develop a test platform suitable for NFMI antenna testing, to model, design and test NFMI antennas that have high bandwidth-efficiency, and to explore the possibility of using MIMO (multiple-input multiple-output) to increase the capacity of the NFMI channel. This thesis provides system implementations, test results, and channel modeling to aid in the design …
Investigation Of A Planetary Differential For Use As A Continuously Variable Transmission, Austin B. Randall
Investigation Of A Planetary Differential For Use As A Continuously Variable Transmission, Austin B. Randall
Theses and Dissertations
With gas prices on the rise, the demand for high-mileage and low pollution vehicles has taken on an unprecedented role in our society. The production and implementation of electric and hybrid-electric vehicles has recently been a large focus of all major automobile manufacturers. Although these new vehicles have begun to solve much of the expensive fuel consumption and air pollution problems that our economy faces, the initial cost of these vehicles has proven to still be too expensive to capture a significant portion of the market. The further advancement of this technology must not only continue to focus on better …
Investigations Of The Dry Snow Zone Of The Greenland Ice Sheet Using Quikscat, Kevin Randall Moon
Investigations Of The Dry Snow Zone Of The Greenland Ice Sheet Using Quikscat, Kevin Randall Moon
Theses and Dissertations
The Greenland ice sheet is an area of great interest to the scientific community due to its role as an important bellwether for the global climate. Satellite-borne scatterometers are particularly well-suited to studying temporal changes in the Greenland ice sheet because of their high spatial coverage, frequent sampling, and sensitivity to the presence of liquid water. The dry snow zone is the largest component of the Greenland ice sheet and is identified as the region that experiences negligible annual melt. Due to the lack of melt in the dry snow zone, backscatter was previously assumed to be relatively constant over …
Principal Components Analysis, Factor Analysis And Trend Correlations Of Twenty-Eight Years Of Water Quality Data Of Deer Creek Reservoir, Utah, Nicolas Alejandro Gonzalez
Principal Components Analysis, Factor Analysis And Trend Correlations Of Twenty-Eight Years Of Water Quality Data Of Deer Creek Reservoir, Utah, Nicolas Alejandro Gonzalez
Theses and Dissertations
I evaluated twenty-eight years (1980-2007) of spatial-temporal water quality data from Deer Creek Reservoir in Utah. The data came from three sampling points representing the lotic, transitional and lentic zones. The data included measurements of climatological, hydrological and water quality conditions at four depths; Surface, Above Thermocline, Below Thermocline and Bottom. The time frame spanned dates before and after the completion of the Jordanelle Reservoir (1987-1992), approximately fourteen miles upstream of Deer Creek. I compared temporal groupings and found that a traditional month distribution following standard seasons was not effective in characterizing the measured conditions; I developed a more representative …
Computational Modeling Of Functionalized Carbon Nanotubes, Nathaniel Lee Miller
Computational Modeling Of Functionalized Carbon Nanotubes, Nathaniel Lee Miller
Theses and Dissertations
Ab initio self-consistent field (SCF) molecular orbital calculations were performed employing various basis sets to computationally predict methods to functionalize and solubilize carbon nanotubes. The structure and Restricted Hartree-Fock (RHF) or “total” energies of functionalized nanotubes of various configurations were determined via theoretical calculations. Total energies were used to determine preferences for adsorption on nanotube sur-faces. Various diameter carbon nanotubes (CNTs) were tested to determine where a transition from a non-wrapping to a wrapping approach was found likely to occur as a function of diameter. Further refinements to this method could be used to explore additional interactions as nanotube diameter …
Re-Evaluation Of Resistance Prediction For High-Speed Round Bilge Hull Forms, Jae Won
Re-Evaluation Of Resistance Prediction For High-Speed Round Bilge Hull Forms, Jae Won
Theses and Dissertations
Predicting the resistance of a high-speed monohull has been of interest to Naval Architects for several decades. Even though considerable amount of research has been carried out in this area, there remains a degree of uncertainty in the accurate resistance prediction in the early design stage. This research thesis attempts to investigate a method for enhancing the accuracy of resistance prediction methods for high-speed round-bilge monohull form vessels for a wide range of volumetric Froude numbers (Fn). While a number of systematic series are in existence, their data are either not readily available or scattered in various internal reports and …
Novel Soft Surfaces With Interesting Surface And Bulk Morphology, Souvik Chakrabarty
Novel Soft Surfaces With Interesting Surface And Bulk Morphology, Souvik Chakrabarty
Theses and Dissertations
The goal of this research is to cover a broad set of scientific investigations of elastomeric materials based on polydimethylsiloxane (PDMS) and poly((3,3,3-trifluoroethoxymethyl)methyloxetane) diol. The scope of study covers five areas, well correlated with each other. The first study investigates the near surface morphology of condensation cured PDMS as a function of increasing the amount of siliceous phase. The appearance, disappearance and reappearance of untreated fumed silica nanoparticles at the PDMS near surface and their correlation with the volume fraction of siliceous phase have been studied. This research with PDMS nanocomposites has led to the development of an alternative route …
Investigation Of Compliant Space Mechanisms With Application To The Design Of A Large-Displacement Monolithic Compliant Rotational Hinge, Robert Mcintyre Fowler
Investigation Of Compliant Space Mechanisms With Application To The Design Of A Large-Displacement Monolithic Compliant Rotational Hinge, Robert Mcintyre Fowler
Theses and Dissertations
The purpose of this research is to investigate the use of compliant mechanisms in space applications and design, analyze, and test a compliant space mechanism. Current space mechanisms are already highly refined and it is unclear if significant improvements in performance can be made by continuing to refine current designs. Compliant mechanisms offer a promising opportunity to change the fundamental approach to achieving controlled motion in space systems and have potential for dramatic increases in mechanism performance given the constraints of the space environment. A compliant deployment hinge was selected for development after industry input was gathered. Concepts for large-displacement …
Piezoelectrically-Induced Guided Wave Propagation For Health Monitoring Of Honeycomb Sandwich Structures, Fei Song
Theses and Dissertations
Honeycomb sandwich structures have been widely used in marine and aerospace applications due to their high strength/stiffness-to-weight ratio. However, an excessive load or repeated loading in the core tends to induce debonding along the skin-core interface, threatening the integrity and safety of the whole structure. This dissertation focuses on development of guided wave strategies for health monitoring of honeycomb sandwich structures, based on a piezoelectric actuator/sensor network. The honeycomb sandwich panels, which are composed of aluminum alloy (T6061) skins and hexagonal-celled Nomex core, are specifically considered in the study. First, elastic wave propagation mechanism in honeycomb sandwich structures is numerically …
Novel Metamaterial Based Antennas For Flexible Wireless Systems, Haider Khaleel
Novel Metamaterial Based Antennas For Flexible Wireless Systems, Haider Khaleel
Theses and Dissertations
Recent years have witnessed a great deal of interest from both academia and industry in the field of flexible electronic systems. This research topic tops the pyramid of research priorities requested by many national research agencies. Consistently, flexible electronic systems require the integration of flexible antennas operating in specific frequency bands to provide wireless connectivity which is highly demanded by today's information oriented society. On the other hand, metamaterials have become very popular in the design of contemporary antenna and microwave devices due to their wide range of applications derived from their unique properties which significantly enhances the performance of …
Semantic Search And Information Retrieval Techniques For Text Repositories, Lisham L. Singh
Semantic Search And Information Retrieval Techniques For Text Repositories, Lisham L. Singh
Theses and Dissertations
Most organizations keep details of events as electronic documents. Repositories of such documents collected over the time are often used for various purposes, including critical decision making. These documents are generally used to garner information related to a specific event, or for trending or predictive analysis. This could be done manually by going through one document at a time, provided the size of repository is small and there is no time limit for the task. However, in most practical scenarios, the repository size is huge and available time is limited. Such documents typically have multiple fields, each carrying certain information, …
A Systems Engineering Approach To The Design And Integration Of Microstrip Antennas With Wearable Wireless Devices, Daniel Gilbert Rucker
A Systems Engineering Approach To The Design And Integration Of Microstrip Antennas With Wearable Wireless Devices, Daniel Gilbert Rucker
Theses and Dissertations
Modern wireless systems for implantable and wearable Body Area Network (BAN) applications have reached an advanced stage of design and development not possible in previous generations. Systems engineering techniques allow for modern wireless devices to be developed in a top-down approach to meet the necessary design requirements while utilizing modular architectures. A modular systems architecture is developed to form a platform for BAN systems design. The BAN systems architecture defines the requirements, physical architecture, and operational architecture. The antenna component of the system is researched in detail and prototypes are developed to meet the requirements of implantable and wearable BAN …
Performance Characteristics Of Lithium Coin Cells For Use In Wireless Sensing Systems, Yin Zhang
Performance Characteristics Of Lithium Coin Cells For Use In Wireless Sensing Systems, Yin Zhang
Theses and Dissertations
Understanding the pulsed discharge behavior of low-rate lithium coin cells in wireless sensing systems is critical to prolong the operating life and/or reduce the size of battery-powered WSs. This dissertation presents the battery transient analysis for a sensor duty cycle, experimental studies for sustained pulse discharge cycling, and investigation on recharge strategies for a battery/power harvesting hybrid system for WSs. The transient behavior of the lithium coin cells during pulse discharge and subsequent relaxation was investigated with single-pulse experiments and theoretical analysis. The voltage response for a pulsed discharge had two parts: a region of rapid voltage change and a …
Determination Of Phase Equilibria And The Critical Point Using Two-Phase Molecular Dynamics Simulations With Monte Carlo Sampling, Sonal Patel
Theses and Dissertations
The two-phase MD technique employed in this work determines the liquid and vapor phase densities from a histogram of molecular densities within phase clusters in the simulation cell using a new Monte Carlo (MC) sampling method. These equilibrium densities are then fitted in conjunction with known critical-point scaling laws to obtain the critical temperature, and the critical density. This MC post-processing method was found to be more easily implemented in code, and it is efficient and easily applied to complex, structured molecules. This method has been successfully applied and benchmarked for a simple Lennard-Jones (LJ) fluid and a structured molecule, …
A Quantitative Methodology For Vetting "Dark Network" Intelligence Sources For Social Network Analysis, James F. Morris
A Quantitative Methodology For Vetting "Dark Network" Intelligence Sources For Social Network Analysis, James F. Morris
Theses and Dissertations
Social network analysis (SNA) is used by the DoD to describe and analyze social networks, leading to recommendations for operational decisions. However, social network models are constructed from various information sources of indeterminate reliability. Inclusion of unreliable information can lead to incorrect models resulting in flawed analysis and decisions. This research develops a methodology to assist the analyst by quantitatively identifying and categorizing information sources so that determinations on including or excluding provided data can be made. This research pursued three main thrusts. It consolidated binary similarity measures to determine social network information sources' concordance and developed a methodology to …
Unsteady Specific Work And Isentropic Efficiency Of A Radial Turbine Driven By Pulsed Detonations, Kurt P. Rouser
Unsteady Specific Work And Isentropic Efficiency Of A Radial Turbine Driven By Pulsed Detonations, Kurt P. Rouser
Theses and Dissertations
There has been longstanding government and industry interest in pressure-gain combustion for use in Brayton cycle based engines. Theoretically, pressure-gain combustion allows heat addition with reduced entropy loss. The pulsed detonation combustor (PDC) is a device that can provide such pressure-gain combustion and possibly replace typical steady deflagration combustors. The PDC is inherently unsteady, however, and comparisons with conventional steady deflagration combustors must be based upon time-integrated performance variables. In this study, the radial turbine of a Garrett automotive turbocharger was coupled directly to and driven, full admission, by a PDC in experiments fueled by hydrogen or ethylene. Data included …