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Articles 61 - 80 of 80
Full-Text Articles in Physical Sciences and Mathematics
Kinetics Of Atmospheric Reactions Of Biogenic Volatile Organic Compounds: Measurement Of The Rate Constant Ofthujone + Cl· At 296 K And Calculation Ofthe Equilibrium Constant For The Ho2ch2ch2o2· H2o Complex, Marie Coy Killian
Theses and Dissertations
Biogenic volatile organic compounds (VOCs) react with Cl and OH radicals and the resulting radicals combine with oxygen to form peroxy radicals RO2. Organic peroxy radicals can then react with NO to form NO2, a precursor of tropospheric ozone. The work presented here explored the initial reaction between Cl and thujone, a VOC emitted by Great Basin sagebrush. The rate constant for the reaction of thujone + Cl at 296 K was measured with the method of relative rates with FTIR for detection of reactants. LEDs were used to photolyze Cl2 to generate Cl in the reaction cell. Thujone was …
Facies And Reservoir Characterization Of The Permian White Rim Sandstone, Black Box Dolomite, And Black Dragon Member Of The Triassic Moenkopi Formation For Co2 Storage And Sequestration At Woodside Field, East-Central Utah, Walter Andrew Harston
Theses and Dissertations
Geologic sequestration of anthropogenic carbon dioxide (CO2) greenhouse gas emissions is an engineering solution that potentially reduces CO2 emissions released into the atmosphere thereby limiting their effect on climate change. This study focuses on Woodside field as a potential storage and sequestration site for CO2 emissions. The Woodside field is positioned on a doubly plunging, asymmetrical anticline on the northeast flank of the San Rafael Swell. Particular focus will be placed on the Permian White Rim Sandstone, Black Box Dolomite and Black Dragon Member of the Triassic Moenkopi Formation as the reservoir/seal system to store and sequester CO2 at Woodside …
Probability Of Belonging To A Language, Kevin Michael Brooks Cook
Probability Of Belonging To A Language, Kevin Michael Brooks Cook
Theses and Dissertations
Conventional language models estimate the probability that a word sequence within a chosen language will occur. By contrast, the purpose of our work is to estimate the probability that the word sequence belongs to the chosen language. The language of interest in our research is comprehensible well-formed English. We explain how conventional language models assume what we refer to as a degree of generalization, the extent to which a model generalizes from a given sequence. We explain why such an assumption may hinder estimation of the probability that a sequence belongs. We show that the probability that a word sequence …
Warping-Based Approach To Offline Handwriting Recognition, Douglas J. Kennard
Warping-Based Approach To Offline Handwriting Recognition, Douglas J. Kennard
Theses and Dissertations
An enormous amount of the historical record is currently trapped in non-indexed handwritten format. Even after being scanned into images, only a minute fraction of the existing records can be manually transcribed / indexed with reasonable amounts of time and cost. Although progress continues to be made with automatic handwriting recognition (HR), it is not yet good enough to replace manual transcription or indexing. Much of the recent HR work has focused on incremental improvements to methods based on Hidden Markov Models (HMMs) and other similar probabilistic approaches. In this dissertation we present a fundamentally new approach to HR based …
Facile Synthesis And Improved Pore Structure Characterization Of Mesoporous Γ-Alumina Catalyst Supports With Tunable Pore Size, Baiyu Huang
Theses and Dissertations
Mesoporous γ-alumina is the most extensively used catalysts support in a wide range of catalytic processes. The usefulness of γ-alumina relies on its favorable combination of physical, textural, thermal, and chemical properties. Pore structure properties are among the most important properties, since high surface area and large pore volume enable higher loading of active catalytic phases, while design of pore size and pore size distribution is critical to optimize pore diffusional transport and product selectivity. In addition, accurate determination of surface area (SA), pore volume (PV) and pore size distribution (PSD) of porous supports, catalysts, and nanomaterials is vital to …
Experimental Analysis Of Energy-Based Acoustic Arrays For Measurement Of Rocket Noise Fields, Jarom Henry Giraud
Experimental Analysis Of Energy-Based Acoustic Arrays For Measurement Of Rocket Noise Fields, Jarom Henry Giraud
Theses and Dissertations
Microphone arrays are useful for measuring acoustic energy quantities (e.g. acoustic intensity) in the near-field of a full-scale solid rocket motor. Proper characterization of a rocket plume as a noise source will allow for more accurate predictions in engineering models that design for protection of structures, payloads and personnel near the rockets. Acoustic intensity and energy density quantities were measured in three rocket noise fields and have shown that the apparent source region of the rocket becomes smaller and moves upstream as frequency increases. Theoretical results accounting for some scattering and finite-difference errors arising in these types of energy-based measurements …
Face Tracking User Interfaces Using Vision-Based Consumer Devices, Norman Villaroman
Face Tracking User Interfaces Using Vision-Based Consumer Devices, Norman Villaroman
Theses and Dissertations
Some individuals have difficulty using standard hand-manipulated input devices such as a mouse and a keyboard effectively. For such users who at the same time have sufficient control over face and head movement, a robust perceptual or vision-based user interface that can track face movement can significantly help them. Using vision-based consumer devices makes such a user interface readily available and allows its use to be non-intrusive. Designing this type of user interface presents some significant challenges particularly with accuracy and usability. This research investigates such problems and proposes solutions to create a usable and robust face tracking user interface …
Resorcinarene-Based Cavitands: From Structural Design And Synthesis To Separations Applications, Na Li
Resorcinarene-Based Cavitands: From Structural Design And Synthesis To Separations Applications, Na Li
Theses and Dissertations
Resorcinarenes are cyclic tetramers that are synthesized by the condensation of resorcinol and various aldehydes. The upper and lower rims can be modified with substituents that provide specific selectivity and other chemical features. In this work, resorcinarene-based macrocyclic ligands with specific selectivities have been designed, synthesized and applied to chiral amine discrimination and transition metal ion separations.These resorcinarenes fall into two categories. In the first type, the upper rims of resorcinarenes were modified with amino acid groups, including chiral alanine groups. The lower rims were modified with --CH3, or --C11H23 groups. The structures were studied by nuclear magnetic resonance (NMR), …
Online Survey System For Image-Based Clinical Guideline Studies Using The Delphi Method, Todd Martin Harper
Online Survey System For Image-Based Clinical Guideline Studies Using The Delphi Method, Todd Martin Harper
Theses and Dissertations
The increasing use of health information technology (HIT) is due to a rising interest in improving the quality of health care. HIT has the potential to reduce cost and transform services. Proper clinical support systems will contribute to the meaningful use of HIT systems by providing a wide array of data to clinicians for the diagnosis and treatments. Clinical guidelines, created by a consensus of experts, can be put in place to assist physicians in making clinical decisions. Delphi methods are commonly used to create consensus from surveys completed by a team of experts. Image-based studies could create guidelines that …
Toward A Better Understanding Of Recent Warming Of The Central West Antarctic Ice Sheet From Shallow Firn Cores, Jessica Williams
Toward A Better Understanding Of Recent Warming Of The Central West Antarctic Ice Sheet From Shallow Firn Cores, Jessica Williams
Theses and Dissertations
Previous studies have shown significant warming through the 1990s in the West Antarctic Ice Sheet (WAIS); but the records used in those studies end in early 2000, preventing trend analysis into the latest decade. Fourteen new snowpits and firn cores were collected in 2010 and 2011, which have been combined with previous cores to extend the isotopic records over WAIS. Significance of these isotopic patterns across WAIS was determined and is used to re-evaluate the warming of the West Antarctic interior over recent decades. We find that isotopic records longer than 50 years are needed to assess climate trends due …
Character Tables Of Metacyclic Groups, Dane Christian Skabelund
Character Tables Of Metacyclic Groups, Dane Christian Skabelund
Theses and Dissertations
We show that any two split metacyclic groups with the same character tables are isomorphic. We then use this to show that among metacyclic groups that are either 2-groups or are of odd order divisible by at most two primes, that the dihedral and generalized quaternion groups of order 2^n, n = 3, are the only pairs that have the same character tables.
Toward Scalable Human Interaction With Bio-Inspired Robot Teams, Daniel Sundquist Brown
Toward Scalable Human Interaction With Bio-Inspired Robot Teams, Daniel Sundquist Brown
Theses and Dissertations
Bio-inspired swarming behaviors provide an effective decentralized way of coordinating robot teams. However, as robot swarms increase in size, bandwidth and time constraints limit the number of agents a human can communicate with and control. To facilitate scalable human interaction with large robot swarms it is desirable to monitor and influence the collective behavior of the entire swarm through limited interactions with a small subset of agents. However, it is also desirable to avoid situations where a small number of agent failures can adversely affect the collective behavior of the swarm. We present a bio-inspired model of swarming that exhibits …
A Hierarchical Multi-Output Nearest Neighbor Model For Multi-Output Dependence Learning, Richard Glenn Morris
A Hierarchical Multi-Output Nearest Neighbor Model For Multi-Output Dependence Learning, Richard Glenn Morris
Theses and Dissertations
Multi-Output Dependence (MOD) learning is a generalization of standard classification problems that allows for multiple outputs that are dependent on each other. A primary issue that arises in the context of MOD learning is that for any given input pattern there can be multiple correct output patterns. This changes the learning task from function approximation to relation approximation. Previous algorithms do not consider this problem, and thus cannot be readily applied to MOD problems. To perform MOD learning, we introduce the Hierarchical Multi-Output Nearest Neighbor model (HMONN) that employs a basic learning model for each output and a modified nearest …
A Classification Tool For Predictive Data Analysis In Healthcare, Mason Lemoyne Victors
A Classification Tool For Predictive Data Analysis In Healthcare, Mason Lemoyne Victors
Theses and Dissertations
Hidden Markov Models (HMMs) have seen widespread use in a variety of applications ranging from speech recognition to gene prediction. While developed over forty years ago, they remain a standard tool for sequential data analysis. More recently, Latent Dirichlet Allocation (LDA) was developed and soon gained widespread popularity as a powerful topic analysis tool for text corpora. We thoroughly develop LDA and a generalization of HMMs and demonstrate the conjunctive use of both methods in predictive data analysis for health care problems. While these two tools (LDA and HMM) have been used in conjunction previously, we use LDA in a …
The Characterization Of Military Aircraft Jet Noise Using Near-Field Acoustical Holography Methods, Alan Thomas Wall
The Characterization Of Military Aircraft Jet Noise Using Near-Field Acoustical Holography Methods, Alan Thomas Wall
Theses and Dissertations
The noise emissions of jets from full-scale engines installed on military aircraft pose a significant hearing loss risk to military personnel. Noise reduction technologies and the development of operational procedures that minimize noise exposure to personnel are enhanced by the accurate characterization of noise sources within a jet. Hence, more than six decades of research have gone into jet noise measurement and prediction. In the past decade, the noise-source visualization tool near-field acoustical holography (NAH) has been applied to jets. NAH fits a weighted set of expansion wave functions, typically planar, cylindrical, or spherical, to measured sound pressures in the …
Cliff Walls: Threats To Validity In Empirical Studies Of Open Source Forges, Landon James Pratt
Cliff Walls: Threats To Validity In Empirical Studies Of Open Source Forges, Landon James Pratt
Theses and Dissertations
Artifact-based research provides a mechanism whereby researchers may study the creation of software yet avoid many of the difficulties of direct observation and experimentation. Open source software forges are of great value to the software researcher, because they expose many of the artifacts of software development. However, many challenges affect the quality of artifact-based studies, especially those studies examining software evolution. This thesis addresses one of these threats: the presence of very large commits, which we refer to as "Cliff Walls." Cliff walls are a threat to studies of software evolution because they do not appear to represent incremental development. …
Optimized Simulation Of Granular Materials, Seth R. Holladay
Optimized Simulation Of Granular Materials, Seth R. Holladay
Theses and Dissertations
Visual effects for film and animation often require simulated granular materials, such as sand, wheat, or dirt, to meet a director's needs. Simulating granular materials can be time consuming, in both computation and labor, as these particulate materials have complex behavior and an enormous amount of small-scale detail. Furthermore, a single cubic meter of granular material, where each grain is a cubic millimeter, would contain a billion granules, and simulating all such interacting granules would take an impractical amount of time for productions. This calls for a simplified model for granular materials that retains high surface detail and granular behavior …
An Optimized R5rs Macro Expander, Sean P. Reque
An Optimized R5rs Macro Expander, Sean P. Reque
Theses and Dissertations
Macro systems allow programmers abstractions over the syntax of a programming language. This gives the programmer some of the same power posessed by a programming language designer, namely, the ability to extend the programming language to meet the needs of the programmer. The value of such systems has been demonstrated by their continued adoption in more languages and platforms. However, several barriers to widespread adoption of macro systems still exist. The language Racket defines a small core of primitive language constructs, including a powerful macro system, upon which all other features are built. Because of this design, many features of …
Animating Non-Rigid Bodies Using Motion Capture, Jie Long
Animating Non-Rigid Bodies Using Motion Capture, Jie Long
Theses and Dissertations
Simulating the motion of a non-rigid body under external forces is a difficult problem because of the complexity and flexibility of the non-rigid geometry and its associated dynamics. Physically based animation of objects moving in the wind is computationally expensive, so simulation-based approaches oversimplify the model by ignoring important effects, such as tree's sheltering. Motion capture records actual responses of a non-rigid body to external forces and helps solve these problems. Mainly focusing on natural trees and ropes as instances of non-rigid bodies, we present a new approach to building motion for objects in wind using incomplete motion capture data …
Metallization Of Dna And Dna Origami Using A Pd Seeding Method, Yanli Geng
Metallization Of Dna And Dna Origami Using A Pd Seeding Method, Yanli Geng
Theses and Dissertations
In this dissertation, I developed a Pd seeding method in association with electroless plating, to successfully metallize both lambda DNA and DNA origami templates on different surfaces. On mica surfaces, this method offered a fast, simple process, and the ability to obtain a relatively high yield of metallized DNA nanostructures. When using lambda DNA as the templates, I studied the effect of Pd(II) activation time on the seed height and density, and an optimal activation time between 10 and 30 min was obtained. Based on the Pd seeds formed on DNA, as well as a Pd electroless plating solution, continuous …