Digital Commons Network^™

Supply Channel Heat Transfer With Simultaneous Impingement Jet Array Cooling And Crossflow Cooling, David Ritchie

Theses

Experimental data are provided for four different sets of experimental conditions for the coolant-side of a double wall cooled effusion test plate. Employed are three different passages for main flow, cross flow, and impingement flow. Coolant is supplied through the cross flow channel and by means of an impingement jet array to the coolant-side of the effusion test plate. This coolant then supplies all effusion hole entrances. The impingement plate and effusion plate both contain six staggered rows of 10 holes per row, where impingement holes are offset so that each is located between effusion hole entrance locations. Installed within …

Experimental Force And Wing Motion Measurements Of A Bioinspired Flapping Wing In A Martian Density Condition, Jesse Lee Mccain

Theses

A Mars flight vehicle could provide a third-dimension for ground-based rovers and supplement orbital observation stations, providing a much more detailed aerial view of the landscape as well as unprecedented survey of the atmosphere of Mars. However, flight on Mars is a difficult proposition . Due to very low atmospheric density, approximately 1.3% of sea level density on Earth, aircraft must fly approximately ten times faster, or be one hundred times Iighter in weight than their Earth counterparts, to lift themselves on Mars. While traditional aircraft efficiency suffers in the low Reynolds number environment, flapping wing insect inspired flyers on …

The Role Of Auditory Fluency In Judgments Of Learning And Memory Performance, Linda J. Myers

Theses

Empirical research has shown that processing fluency affects peoples’ judgments of learning (JOLs). This study investigated the role of auditory fluency on participants’ JOLs, Workload and Effort ratings, and Recognition Performance. Two simultaneous science lectures were monaurally presented to participants. Auditory fluency was manipulated by varying the signal-to-noise level (SNR Level: 0 dB SNR, -3 dB SNR, -6 dB SNR) between the Target and the Masker and by varying the sex of the Target and Masker (Condition). Participants provided JOLs and other ratings and completed a recognition test after each 3 min lecture segment. There was no main effect of …

Seeding Hydrogen Propellant In Nuclear Thermal Propulsion Engines, Daria Nikitaeva

Theses

Using the NASA Design Reference Architecture, Nuclear Thermal Propulsion engine and Mars transfer vehicle models were developed to numerically examine the effects of adding heavy noble gases into the hydrogen propellant stream (seeding) on round trip transit times (baseline of 357 days). Seeded hydrogen, up to maximum seed mass concentration (MSMC) 55.85%, increased engine and vehicle performance by reducing pressure losses, decreasing reactor power, and increasing the overall change in velocity while assuming constant vehicle volume and dry mass. The tradeoff was lowered specific impulse and increased net propellant mass, resulting in increased vehicle wetted mass. Vehicle performance increased at …

Love And Hip Hop : An Examination Of Hip-Hop Media Effects On African American Romantic Relationships, Latoya D. Binford

Theses

Hip-hop has grown immensely since its invention in the 1970s. No longer just a musical genre, its influences can be seen in all facets of culture, especially within the African American community in which it was created. Because so much of the commercially successful hip-hop media is shrouded in themes such as violence, abuse, and misogyny, it is important to examine its effects on its consumer. This study examined the effects of hip-hop consumption on romantic relationships, as perceived by African American/black women. Through thematic analysis and the theoretical framework of Mere Exposure effect, findings revealed that the participants correlated …

Towards An Aristotelian Theory Of Care: A Comparison Of Neo-Aristotelian Virtue Ethics With Feminist Ethics Of Care, And The Fundaments Of A Virtue Ethical Theory Of Care, Steven Steyl

Theses

The intersection between virtue and care ethics is underexplored in contemporary moral philosophy. This thesis approaches care ethics from a neo-Aristotelian virtue ethical perspective, comparing the two frameworks and drawing on recent work on care to develop a theory thereof. It is split into seven substantive chapters serving three major argumentative purposes, namely the establishment of significant intertheoretical agreement, the compilation and analysis of extant and new distinctions between the two theories, and the synthesis of care ethical insights with neo-Aristotelianism to generate a virtue ethical theory of care. In the first two chapters, I outline virtue ethics and care …

Experimentally Linking Head Kinematics To Brain Deformation, Imouline Algharbi

Theses

Traumatic brain injury (TBI) research is used to study the effects of brain injuries and the rehabilitations for them. TBI contributes to major cause of disability and deaths quantifying up to 30% of all the head injuries. To mimic real world impact to understand the mechanism of injury head-surrogate models are used. This thesis describes a method to record head kinematics from acceleration and angular rate sensors of head-brain surrogate model for blast and blunt injury. This methodology is validated through experimental testing. To get a better insight of the head kinematics experienced by a real skull a drop tower …

Longitudinal Investigation Of Disparity Vergence In Young Adult Convergence Insufficiency Patients, Patrick C. Crincoli

Theses

Vergence is a form of eye movement in which the eyes move in opposite directions to minimize retinal disparity. It allows an object at different distances from a viewer to appear single during binocular vision by centering the image on the fovea of each retina. Convergence insufficiency (CI) is a binocular disfunction in which blurry and double vision is a symptom. Office-based Vergence/Accommodative Therapy (OBVAT) has been shown to be effective in treating CI. A randomized clinical trial was designed to study fifty participants with CI before and after therapy using randomized therapy treatment (active and placebo), standardized clinical definitions, …

Interactions Between Polymer Nanoparticles And Blood Plasma Applied To Drug Delivery Systems, Mark Bannon

Theses

Targeted nanoparticle drug delivery has the potential to replace current forms of cancer therapy with previously unparalleled efficiency. Upon introduction into the human body, nanoparticles exhibit a substantial increase in diameter due to a biomolecular corona formation caused by interactions between blood plasma proteins and the nanoparticles. These interactions must be analyzed and understood for targeted delivery to reach its potential in both feasibility and efficiency.

To study the formation of the protein corona, polystyrene nanoparticles were incubated in vitro in goat blood plasma for 10-minute intervals, diluted to different degrees and then measured to obtain the hydrodynamic diameter of …

Icing Thickness Prediction Model For Overhead Transmission Lines, Yue Ming

Theses

Failures in a large electric power system are often inevitable. Severe weather conditions are one of the main causes of transmission line failures. Using the fault data of transmission lines of Shaanxi Power Grid from 2006 to 2016, in conjunction with meteorological information, this paper analyses the relationship between the temporal-spatial distribution characteristics of meteorological disasters and the fault of transmission lines in Shaanxi Province, China.

In order to analyze the influence of micro-meteorology on ice coating, a grey correlation analysis method is proposed. This thesis calculates the grey relational between ice thickness and micro-meteorological parameters such as ambient temperature, …

Polya Db3: A Database Cataloging Polyadenation Sites(Pas) Across Different Species And Their Conservation, Ram Mohan Nambiar

Theses

Polyadenation is an important process occurring in the messenger RNA that involves cleavage of 3 end nascent mRNAs and addition of poly(A) tails. For this thesis,I present PolyA DB3 ,a database cataloging cleavage and polyadenylation sites (PASs) in several genomes specifically for human,mouse,rat and chicken. This database is based on deep sequencing data. PASs are mapped by the 3’ region extraction and deep sequencing (3’READS) method, ensuring unequivocal PAS identification. Large volume of data based on diverse biological samples is used to increase PAS coverage and provide PAS usage information. Strand-specific RNA-seq data were used to extend annotated 3’ ends …

The Use Of Media Technologies In Long-Distance Relationships, Paola P. Soto Herrera

Theses

Communication technologies have helped reduce personal distances and stay connected. This study pursued the following questions: What are the most popular media used to communicate in long-distance relationships? Are those in long-distance relationships more likely to use rich or lean media? Do family, friends, and romantic partners differ in their selection of media? Instant Messaging, social media (Instagram, Facebook, Twitter, Snapchat), telephone (cellular, mobile, or landline), online video chat, online audio chat, SMS, and regular mail were the most used media. Respondents were significantly more likely to use rich media. Romantic partners were more likely than either family or friends …

An Adaptive Inventory Management System For Hospital Supply Chain, Pradeep G. Pai

Theses

In healthcare, delivering high quality care to the patients typically requires significant investment in supply chain management systems. Inventory management is an important part of any supply chain system. Researchers have indicated great potential for optimizing existing healthcare inventory systems, especially within hospitals. With ever changing needs, product prices and policies, managing inventory of products in hospitals becomes difficult. As time progresses, the inventory policies of products become sub-optimal. In this research, we study multiple echelons of a hospital supply chain considering the distributors, to address the need for an efficient and effective hospital inventory management system. We propose a …

An Application Of Deep-Learning To Understand Human Perception Of Art, Sanjana Kapisthalam

Theses

Eye movement patterns are known to differ when looking at stimuli given a different task, but less is known about how these patterns change as a function of expertise. When a particular visual pattern is viewed, a particular sequence of eye movements are executed and this sequence is defined as scanpath. In this work we made an attempt to answer the question, “Do art novices and experts look at paintings differently?” If they do, we should be able to discriminate between the two groups using machine learning applied to their scanpaths. This can be done using algorithms for Multi-Fixation Pattern …

Development And Characterization Of Novel Iii-V Materials For High Efficiency Photovoltaics, Zachary Shible Bittner

Theses

Photovoltaics (PV) are an enabling technology in the field of aerospace, allowing satellites to operate far beyond the technological limitations of chemical batteries by providing a constant power source. However, launch costs and payload volume constraints result in a demand for the highest possible mass and volume specific power generation capability, a proxy for which is device power conversion efficiency. Enhancing the efficiency of III-V PV devices beyond the single-junction Shockley Queisser (SQ) limit has been a driving goal in PV development. Two competing loss mechanisms are thermalization, where photon energy in excess of the absorbing material’s bandgap is lost …

Properties Of Mixing Sac Solder Alloys With Bismuth-Containing Solder Alloys For A Low Reflow Temperature Process, Tayler John Swanson

Theses

The subject of extensive research has been the establishing of lower temperature soldering of electronic assemblies that are similar to the once common yet still preferred eutectic Tin-Lead (SnPb) soldering manufacturing processes that are below 217˚C. This research opportunity will contribute data on mixed solder alloy assemblies that can be formed at lower process temperatures. There are many environmental and economic benefits of avoiding the current reliability concerns of assembling electronics at the standard high temperatures which peak at 230˚C 260˚C. To reduce this temperature the use of Bismuth containing solder pastes are mixing with the standard high temperature SAC …

A Method For Use Phase Definition As Integrated Into An Object-Oriented Approach To Life Cycle Assessment, Alissa Marie Santucci

Theses

As global environmental concerns increase, industries continue to respond prominently to meeting sustainable practice standards through technological innovations and new business models. However, current sustainability measurement tools, including Life Cycle Assessment (LCA), do not provide practitioners with sufficiently standardized methodology, which leads to uncertainty and limited comparability of results. This research develops a systematic Object-Oriented LCA method to define and quantify the consumed life of a product system during the use scenario under analysis. In this method, the Cumulative Damage Function (CDF) quantifies the consumed life of a product by using inputs of total efficiency or damage, scaling parameters and …

Automatic Modulation Classification Using Cyclic Features Via Compressed Sensing, Andrew J. Ramsey

Theses

Cognitive Radios (CRs) are designed to operate with minimal interference to the Primary User (PU), the incumbent to a radio spectrum band. To ensure that the interference generated does not exceed a specific level, an estimate of the Signal to Interference plus Noise Ratio (SINR) for the PU’s channel is required. This can be accomplished through determining the modulation scheme in use, as it is directly correlated with the SINR. To this end, an Automatic Modulation Classification (AMC) scheme is developed via cyclic feature detection that is successful even with signal bandwidths that exceed the sampling rate of the CR. …

Transcriptome-Wide Analysis Of Vsv Strains With Varying Ability To Block Nf-Κb, Thomas M. Russell

Theses

Vesicular stomatitis virus (VSV) is a negative sense, single-stranded RNA (ssRNA) virus that is currently studied for its uses as a vaccine viral vector and its potential in oncolytic therapy. The M protein of VSV is the active participant in the virus’s abrogation of the host innate immune response. This activity is thought to be due to the M protein’s ability to downregulate overall host transcription by blocking nuclear transport. A VSV mutant containing a D52G mutation in the M protein (22-20) has been shown to block nuclear transport while being defective as a suppressor of NF-κB activation. It is …

Predictive Models In Brain Connectivity Analysis, Guenadie Nibbs

Theses

Neuroscience have been the field with most significant contributions to the study of the human brain. The development of new techniques for image acquisition has made possible the improvement of extracting quality information of brain activity. Utilizing functional MRIs, is possible to measure brain activity based on changes of the oxygen level in the blood at certain period of time. This imaging data is transformed into numerical values using a software that maps all the information into a data object. Taking advantage of the availability of functional connectivity information of the human brain, the present study shows a widespread process …

Statistical Aspects Of Music Mining: Naive Dictionary Representation, Qiuyi Wu

Theses

Extensive studies have been conducted on both musical scores and audio tracks of western classical music with the finality of learning and detecting the key in which a particular piece of music was played. Both the Bayesian Approach and modern unsupervised learning via latent Dirichlet allocation have been used for such learning tasks. In this research work, we propose and develop the novel idea of treating musical sheets as literary documents in the traditional text analytics parlance, to fully benefit from the vast amount of research already existing in statistical text mining and topic modeling.

We specifically introduce the idea …

Modeling And Extraction Of Transport Parameters To Simulate Drug Delivery In The Murine Cochlea, Kevin Wilson

Theses

The usage of 1D and 3D models to simulate drug transport through the inner ear is a prominent method in cochlear fluid pharmacokinetics. However, the data used to create these models, is often based on invasive sampling methods that limit the spatial resolution given the size of the cochlear compartments within which solute can be measured. In this work by leveraging 3-D registered micro-Computed Tomography (μCT) scans of the murine cochlea that have been taken as iodinated contrast agent is delivered to it, we extract transport parameters and simulate a forward 1D model that allows variable and pulsatile delivery profiles …

Atmosphere Of An Explosion, Sarah Kinard

Theses

The thesis work explores the impact of an abusive environment and in what ways that abuse influences and directs an individual's state of mind. My creative exploration comes from my intimate, personal childhood memories and experiences. Working through the influences that the cycle of trauma creates, led me to the use of a variety of materials to focus in a singular voice in this body of work. I developed a symbolic and emotive visual vocabulary that speaks about how I have been shaped both spiritually and emotionally, through my exposure and my journey of self-healing. I will discuss in this …

Multi-Modal Deep Learning To Understand Vision And Language, Shagan Sah

Theses

Developing intelligent agents that can perceive and understand the rich visual world around us has been a long-standing goal in the field of artificial intelligence. In the last few years, significant progress has been made towards this goal and deep learning has been attributed to recent incredible advances in general visual and language understanding. Convolutional neural networks have been used to learn image representations while recurrent neural networks have demonstrated the ability to generate text from visual stimuli. In this thesis, we develop methods and techniques using hybrid convolutional and recurrent neural network architectures that connect visual data and natural …

Investigation Of Erg1a Potassium Channel Modulation Of Calpain Activity In C2c12 Myotubes, Clayton Alan Whitmore

Theses

Skeletal muscle atrophy is a result of an imbalance in protein synthesis and protein degradation. It is a part of the normal aging process, but also may occur in response to several stimuli including disease, injury, and disuse. Currently there is no truly effective pharmacological treatment for atrophy. The best treatment is a healthy diet and exercise, however, sick and aging individuals are not always capable of participating in the appropriate activity. Therefore, exploration of the mechanisms contributing to atrophy is essential because this may lead to discovery of an effective therapeutic target. The ether-a-go-go related gene (Erg1a) K+ channel …

The Photometric Effect Of Macroscopic Surface Roughness On Sediment Surfaces, Greg Badura

Theses

The focus of this work was on explaining the effect of macroscopic surface roughness on the reflected light from a soil surface. These questions extend from deciding how to best describe roughness mathematically, to figuring out how to quantify its effect on the spectral reflectance from a soil’s surface. In this document, I provide a background of the fundamental literature in the fields of remote sensing and computer vision that have been instrumental in my research. I then outline the software and hardware tools that I have developed to quantify roughness. This includes a detailed outline of a custom "LiDAR" …

Covariance Estimation From Limited Data: State-Of-The-Art, Algorithm Implementation, And Application To Wireless Communications, Ian Tomeo

Theses

There are many different methods of filtering that have been known to provide better results than basic Sample-Matrix-Inversion (SMI). Providing a well-conditioned covariance matrix to these filters will provide a higher Signal to Interference plus Noise Ratio (SINR) than SMI filtering when there are large numbers of receiver element and interference signals. The available number of coherent snapshots that will be used for filter estimation is “not large enough” with respect to the array dimensionality. Common techniques to deal with this situation is to use Krylov or Singular Value Decomposition (SVD) reduced rank filtering. Auxiliary Vector (AV) filtering with the …

Chinese Ornaments Of The Imperial Robe: A Modern Motif Design Interpretation, Xiaoya Shen

Theses

“Twelve Ornaments” are a group of ancient Chinese symbols and designs that are considered highly auspicious. In ancient China, because they signified authority and power, they were employed in the decoration of textile fabrics, and were embroidered on vestments of state, such as the Imperial Robe. They are the patterns that could represent the essence of Chinese traditional national dress.

This thesis project is based on the analysis, research and summarization of this design history as well as the establishment of effective visual design solutions intended to transform the twelve ornaments into modern motif designs. The design will retain the …

Bad Droid! An In-Depth Empirical Study On The Occurrence And Impact Of Android Specific Code Smells, Khalid Saeed Almalki

Theses

Knowing the impact of bad programming practices or code smells has led researchers to conduct numerous studies in software maintenance. Most of the studies have defined code smells as bad practices that may affect the quality of the software. However, most of the existing research is heavily focused on detecting traditional code smells and less focused on mobile application specific Android code smells. Presently, there is a few papers that focus on android code smells - a catalog for Android code smells. This catalog defines 30 Android specific code smell that may impact maintainability of an app. In this research, …

A Technique For The Optimization Of Actuation Characteristics Of Ionic Polymer-Metal Composites, Vaughn Varma

Theses

Ionic-Polymer-Metal Composites (IPMCs) are a subset of Electroactive Polymers (EAPs), which are an actively-researched class of electromechanical actuators. IPMCs are similar in function to piezoelectric actuators, however require substantially lower input voltage, requiring as little as 1V to actuate, and with a very high maximum no-load strain of over 300%. IPMCs can be built from biocompatible materials, and do not require the use of any permanent magnets, making them suitable for medical applications, or for use in environments subject to strong or fluctuating magnetic fields. IPMCs are additionally soft and flexible, and are suitable for wet environments, further improving their …