Digital Commons Network^™

Development And Validation Of An Automated Directivity Acquisition System Used In The Acquisition, Processing, And Presentation Of The Acoustic Far-Field Directivity Of Musical Instruments In An Anechoic Space, Nicholas J. Eyring

Theses and Dissertations

A high spatial resolution acoustic directivity acquisition system (ADAS) has been developed to acquire anechoic measurements of the far field radiation of musical instruments that are either remote controlled or played by musicians. Building upon work performed by the BYU Acoustic Research Group in the characterization of loudspeaker directivity, one can rotate a musical instrument with sequential azimuthal angle increments under a fixed semicircular array of microphones while recording repeated notes or sequences of notes. This results in highly detailed and instructive directivity data presented in the form of high-resolution balloon plots. The directivity data and corresponding balloon plots may …

Molecular Modeling Of Dna For A Mechanistic Understanding Of Hybridization, Terry Jacob Schmitt

Theses and Dissertations

DNA microarrays are a potentially disruptive technology in the medical field, but their use in such settings is limited by poor reliability. Microarrays work on the principle of hybridization and can only be as reliable as this process is robust, yet little is known at the molecular level about how the surface affects the hybridization process. This work uses advanced molecular simulation techniques and an experimentally-parameterized coarse-grain model to determine the mechanism by which hybridization occurs on surfaces and to identify key factors that influence the accuracy of DNA microarrays. Comparing behavior in the bulk and on the surface showed, …

The Effects Of Professional Development On High School Teachers' Implementation Of The Problem-Solving Process, Brandon Y. Jackson

Theses and Dissertations

The majority of schools use punitive and reactive strategies to deal with maladaptive behaviors. This descriptive study was a replication of Wilmott (2012) and occurred in a multi-tiered system of supports (MTSS) high school. Professional development was provided to 22 teachers from a high school located in the western United States. This included 61% males and 39% females. Measures included the frequency of praise notes and ODRs, the quality of praise notes based on a praise note rubric, and a social validity questionnaire. The ODR and praise note frequencies were compared using the Spearman correlational coefficient that resulted in a …

Synthesis, Characterization, And Application Of High Surface Area, Mesoporous, Stabilized Anatase Tio2 Catalyst Supports, Rebecca Elizabeth Olsen

Theses and Dissertations

Nanomaterials have attracted substantial attention in the area of catalysis due to the unique properties they exhibit such as high surface areas, intricate pore networks and unique morphologies. TiO2 has attracted attention as a catalyst since the discovery of its high photocatalytic activity by Fuishima and Honda in 1972. Given its high thermal stability, low cost, low environmental impact, and versatility, TiO2 is a widely used commercial catalyst and catalyst support. TiO2 is used in many applications such as photocatalysis is also an excellent support material for noble metals in a number of oxidative synthesis and pollution-control reactions. Though TiO2 …

Variational Methods And Critical Point Theory 2013, Victoria Otero-Espinar, Juan J. Nieto, Donal O'Regan, Kanishka Perera

Mathematics and System Engineering Faculty Publications

[No abstract provided]

The Effects Of Histone And Glycosaminoglycans On Human Factor Xa And Antithrombin Iii Interactions, Amy Thomas

Honors Projects

Heparin and protamine have been found neutralize each other such that the anticoagulant effects of both compounds are not observed. In the present study, the effects of histone and glycosaminoglycans on the formation and degradation of the 1°Xaα-ATIII complex to the 3°Xaβ-ATIII complex are explored. In the presence of histone, there is a dramatic drop in the levels of 1°Xa-ATIII complexes and an increase in the levels of 3°Xa-ATIII complexes, measured relative to the control, indicating the effect of histone to promote the degradation of the 1°Xa-ATIII complexes. Heparin alone moderately reduces levels of the 1°Xa-ATIII complexes and the 3°Xaα-ATIII …

Wsu Board Of Trustees Meeting Minutes, December 12-13, 2013

Board of Trustees Minutes

Minutes from the Wright State University Board of Trustees Meeting held on December 12-13, 2013.

Geology Of The Birdseye 7.5-Minute Quadrangle, Utah County, Utah:Â Implications For Mid-Cenozoic Extension And Deposition Of The Moroni Formation, Don L. Bagshaw

Theses and Dissertations

Geologic structures within the Birdseye 7.5 minute quadrangle Utah County, Utah have been related by previous workers to both the Jurassic Arapien Shale diapirism and to the mid-Cenozoic extensional collapse of the Charleston-Nebo Thrust. Whichever model proves valid, it will have implications for oil exploration and interpretation of the subsurface geologic structure in the region. A detailed map of the quadrangle was constructed to better constrain which mechanism was responsible for the deformation. Exposures of Arapien Shale near, and within the Birdseye quadrangle show no evidence of diapiric movement. Arapien involvement in the deformation of Tertiary rocks in the center …

Real Time Monitoring Of Surface Chemical Events By Streaming Potentials In Microfluidic Channels, Kenji Nokura

Theses and Dissertations

Zeta potential is one of the tools to measure the surface charge of materials, and Alvarez et al. have developed a microchannel device to measure zeta potentials in real time for label-free sensing using immobilized receptors on microchannel surfaces. However, the challenge has been the charge interference of surface modifiers on analyte detection. Therefore, it was necessary to find the best strategy to regenerate minimal surface charge after modifying the channel with polymer films that would anchor the affinity groups for the analyte. It was demonstrated that adsorption of positively and negatively charged analytes were monitored via real time zeta …

Thermodynamics Of A Rotating Detonation Engine, Craig A. Nordeen

Doctoral Dissertations

A practical thermodynamic cycle model of a rotating detonation engine (RDE) is developed for the purpose of predicting performance and understanding flow field behavior. The cycle model is based on a heuristic analysis of a RDE numerical simulation. The model is compared to the simulation and to laboratory experiment with good results.

The RDE constrains a detonation wave to rotate inside a cylindrical annulus, has no moving parts and requires a single ignition sequence. Thrust is produced continuously and at high frequency. The simplicity of the RDE offers the possibility of a practical detonation engine with efficiencies that exceed conventional …

Ice Crystal Formation And Evolution In Five Campaigns: Start08, Hippo Global, Dc3, Predict And Torero, Minghui Diao, Joshua Digangi, Anthony O’Brien, Mark Zondlo

Faculty Publications, Meteorology and Climate Science

In order to understand the microphysical properties of cirrus clouds, it is important to understand the formation and evolution of the environments where ice crystals form and reside on the microscale (~100 m). Uncertainties remain in simulating/parameterizing the evolution of ice crystals, which require more analyses in the Lagrangian view. However, most in situ observations are in the Eulerian view and are restricted from examining the lifecycle of cirrus clouds. In this work, a new method of Diao et al. GRL (2013)* is used to separate out five phases of ice crystal evolution, using the horizontal spatial relationships between ice …

Analyzing The Effect Of Client Queue Size On Voip And Tcp Traffic Over An Ieee 802.11e Wlan, Sajib Datta, Sajal Das

Computer Science Faculty Research & Creative Works

In this paper we introduce a mathematical model to analyze the performance of Wi-Fi networks carrying voice calls and TCP controlled file downloads. We derive the voice call capacity, the TCP throughput, and the bandwidth utilization using the proposed five-dimensional Markov model. We show that there exists a correlation among the queue size of client nodes and the capacity and throughput of the network. We also demonstrate how bandwidth utilization is affected by variable packet arrival rates. The analytical results match well with the simulation results generated by QualNet simulator. Moreover, we conduct an experimental study of the Enhanced Distributed …

University Of Northern Iowa Graduate Council Minutes, December 12, 2013, University Of Northern Iowa. Graduate Council.

Documents - Graduate Council

Meeting minutes from the Graduate Council of the University of Northern Iowa.

Soil Development And Vegetation Response To Removal Of A Small Dam, Lassen Volcanic National Park, California, Stephanie Kay Rohdy

Dissertations and Theses

Dam removal is increasing as dams age, yet little is understood about the pedogenic response to dam removal. This study reports on the edaphic changes of reservoir sediments and vegetation cover one year following removal of a small earthen dam in Northern California. In August 2012, I sampled surface sediments from the former Dream Lake reservoir in Lassen Volcanic National Park, and compared their physical and chemical properties with soil samples from two reference sites. I also estimated percent cover of vegetation in the former reservoir and reference sites. My results show that the reservoir was under reduced conditions, as …

A Ten-Year Record Of Supraglacial Lake Evolution And Rapid Drainage In West Greenland Using An Automated Processing Algorithm For Multispectral Imagery, B. F. Morriss, R. L. Hawley, J. W. Chipman, L. C. Andrews

Dartmouth Scholarship

The rapid drainage of supraglacial lakes introduces large pulses of meltwater to the subglacial environment and creates moulins, surface-to-bed conduits for future melt. Introduction of water to the subglacial system has been shown to affect ice flow, and modeling suggests that variability in water supply and delivery to the subsurface play an important role in the development of the subglacial hydrologic system and its ability to enhance or mitigate ice flow. We developed a fully automated method for tracking meltwater and rapid drainages in large (> 0.125 km²) perennial lakes and applied it to a 10 yr time …

Interferometric Swath Processing Of Cryosat Data For Glacial Ice Topography, L. Gray, D. Burgess, L. Copland, R. Cullen, N. Galin, R. Hawley, V. Helm

Dartmouth Scholarship

We have derived digital elevation models (DEMs) over the western part of the Devon Ice Cap in Nunavut, Canada, using "swath processing" of interferometric data collected by Cryosat between February 2011 and January 2012. With the standard ESA (European Space Agency) SARIn (synthetic aperture radar interferometry) level 2 (L2) data product, the interferometric mode is used to map the cross-track position and elevation of the "point-of-closest-approach" (POCA) in sloping glacial terrain. However, in this work we explore the extent to which the phase of the returns in the intermediate L1b product can also be used to map the heights of …

The Mediating Role Of Classroom Social Environment Between Teacher Self-Efficacy And Student Adjustment, Keri Stewart

USF Tampa Graduate Theses and Dissertations

The purpose of this study is to investigate whether students' perceptions of the classroom social environment mediate the relations between teacher self-efficacy and student adjustment.

Research suggests that early adolescents often experience decreases in engagement and motivation during the middle school years, which can put individuals at risk for academic failure and school dropout (Eccles, Lord, & Midgley, 1991). This occurs due to a mismatch between the individuals' developmental needs and the environment (Eccles et al., 1993). Whether early adolescents remain engaged in school is largely dependent on how they perceive the classroom environment promoted by their teacher (Erikson, 1950; …

Sensitivity Curves For Searches For Gravitational-Wave Backgrounds, E. H. Thrane, Joseph D. Romano

Physics & Astronomy Faculty Publications

We propose a graphical representation of detector sensitivity curves for stochastic gravitational-wave backgrounds that takes into account the increase in sensitivity that comes from integrating over frequency in addition to integrating over time. This method is valid for backgrounds that have a power-law spectrum in the analysis band. We call these graphs “power-law integrated curves.” For simplicity, we consider cross-correlation searches for unpolarized and isotropic stochastic backgrounds using two or more detectors. We apply our method to construct power-law integrated sensitivity curves for second-generation ground-based detectors such as Advanced LIGO, space-based detectors such as LISA and the Big Bang Observer, …

Agenda And Attachments, 2013 December 11

Agendas and Minutes

No abstract provided.

We Are...Marshall, December 11, 2013, Office Of Marshall University Communications

We Are ... Marshall: the Newsletter for Marshall University 1999-2023

No abstract provided.

Mathematics Alum Joins Cowden Associates, Ohio University College Of Arts & Sciences

All Forum Articles

No abstract provided.

Robinson Point, Belize: An Important Foraging Ground For Endangered Sea Turtles In The Western Caribbean Sea, Linda Searle

HCNSO Student Theses and Dissertations

Anecdotal reports, flipper tag returns, satellite migration paths, and above-water and net surveys have identified an important foraging area for sea turtles in the Robinson Point area, 12 kilometers southwest of Belize City. Visual observations confirmed that sea turtles were actively foraging at Robinson Point. Sixteen 30 minute visual observations from stationary and drifting boats made 132 sea turtle sightings from October 2007 through January 2008, with a maximum of 40 sightings made in one survey. In-water capture methodology tested the traditional turtle net, which captured 14 turtles in 63 sets for a success rate of only 22%. There were …

Nonlinear Spectroscopic Investigation Of Adsorption To C-18 Model Stationary Phase, Anthony D. Peterson

Theses and Dissertations

Reversed-phase liquid chromatography (RPLC) is a commonly used separation technique in chemistry. Nevertheless, the mechanistic interactions at the molecular level among the eluent, analyte, and the stationary phase are not fully understood. Because of this limited understanding, optimization of the separation must be done experimentally. Learning more about molecular interactions should aid in improving separations. We are currently using second-harmonic generation (SHG) spectroscopy to investigate how analytes adsorb to the surface. SHG is a spectroscopic technique that produces signal only at places of non-isotropic symmetry; this typically occurs at surfaces. SHG can be used to produce surface isotherms of test …

Record Linkage, Stasha Ann Bown Larsen

Theses and Dissertations

This document explains the use of different metrics involved with record linkage. There are two forms of record linkage: deterministic and probabilistic. We will focus on probabilistic record linkage used in merging and updating two databases. Record pairs will be compared using character-based and phonetic-based similarity metrics to determine at what level they match. Performance measures are then calculated and Receiver Operating Characteristic (ROC) curves are formed. Finally, an economic model is applied that returns the optimal tolerance level two databases should use to determine a record pair match in order to maximize profit.

Can Bohmian Mechanics Be Made Relativistic?, Detlef Dürr, Sheldon Goldstein, Travis Norsen, Ward Struyve, Nino Zaghì

Physics: Faculty Publications

In relativistic space-time, Bohmian theories can be formulated by introducing a privileged foliation of space-time. The introduction of such a foliation – as extra absolute space-time structure – would seem to imply a clear violation of Lorentz invariance, and thus a conflict with fundamental relativity. Here, we consider the possibility that, instead of positing it as extra structure, the required foliation could be covariantly determined by the wave function. We argue that this allows for the formulation of Bohmian theories that seem to qualify as fundamentally Lorentz invariant. We conclude with some discussion of whether or not they might also …

Differences Between Healthcare Systems In Costa Rica & The United States And How Those Differences Affect The Overall Quality Of Healthcare, Carlie Decker

Honors Theses

This thesis seeks to examine the similarities and differences between the healthcare system employed in Costa Rica and the healthcare system employed in the United States through a series of interviews and web-based research. Four healthcare system components will be examined in order to determine the success of each system. These components include health insurance coverage, access to pharmaceuticals, medical licensing requirements, and medical research.

Following the completion of the interviews and research, I found that United States citizens pay nearly four times the amount Costa Rican citizens do for health insurance coverage. This dramatic increase in price can be …

The Design And Validation Of A Computational Rigid Body Model For Study Of The Radial Head, Cassandra Woodcock

Theses and Dissertations

Rigid body modeling has historically been used to study various features of the elbow joint including both physical and computational models. Computational modeling provides an inexpensive, easily customizable, and effective method by which to predict and investigate the response of a physiological system to in vivo stresses and applied perturbations. Utilizing computer topography scans of a cadaveric elbow, a virtual representation of the joint was created using the commercially available MIMICS(TM) and SolidWorks(TM) software packages. Accurate 3D articular surfaces, ligamentous constraints, and joint contact parameters dictated motion. The model was validated against two cadaveric studies performed by Chanlalit et al. …

Discovering Driver Somatic Mutations, Copy Number Alterations And Methylation Changes Using Markov Chain Monte Carlo, Bokhari Yahya

Theses and Dissertations

Nowadays we have tremendous amount of genetic data needing to be interpreted. Somatic mutations, copy number variations and methylation are example of the genetics data we are dealing with. Discovering driver mutations from these combined data types is challenging. Mutations are unpredictable and have broad heterogeneity, which makes our goal hard to accomplish. Many methods have been proposed to solve the mystery of genetics of cancer. In this project we manipulate those above mentioned genetics data types and choose to use and modified an existing method utilizing Markov Chain Monte Carlo (MCMC). The method introduced two properties, coverage and exclusivity. …

Feed Rate Effects In Freeform Filament Extrusion, Omkar Rishi

Theses

3D printing technologies have evolved drastically in the last decade. Professional grade 3D printers produce very high quality parts largely because they have been optimized for use with just a few different materials and do not allow the user to change process parameters. Conversely, Freeform Filament Extrusion (FFE) is a technology that has emerged as a favorite of hobbyists due to widespread availability of low cost open architecture machines that permit extensive experimentation with any number of materials. The FFE 3D printing process operates by feeding thermoplastic filament through a heated nozzle while the nozzle "draws" the desired pattern one …

The Role Of Algal Symbiont Community Dynamics In Reef Coral Responses To Global Climate Change, Ross Cunning

Open Access Dissertations

The continued growth and survival of reef-building corals is essential to sustain the goods and services provided by coral reefs, worth billions of dollars annually. However, warming oceans are causing more frequent and severe episodes of coral bleaching, the breakdown of symbiosis between corals and their algal symbionts (Symbiodinium spp.), which threatens corals’ survival unless they can adapt or acclimatize. One way that corals may increase their thermal tolerance is by associating with different Symbiodinium types. Changes in partner abundance may also have functional consequences, but these symbiont dynamics are poorly understood. This dissertation aims to provide a clearer understanding …