Digital Commons Network^™

Nanopore Thermodynamics Via Infrared Laser Heating, Christopher Angevine

Theses and Dissertations

Single molecule nanopore spectroscopy is a label-free method for characterizing a wide variety of water-soluble molecules. Recently there have been efforts to expand nanopore sensing to new areas of study. Forensic investigators require an easy to deploy method to identify an unknown number of contributors in a solution. Currently there is no easily available method to distinguish between a single or multiple contributor solution of DNA before being processed by more advanced analytical techniques which has led to wasted time and resources increasing the backlog of samples waiting to be processed. In this work we present a new nanopore technique …

Upper Elementary Reading Instruction In The Age Of Accountability: Balancing Best Practices With Pressures To Achieve On High-Stakes Tests, Christina H. Saunders

Theses and Dissertations

The present study identifies reading instructional practices used in upper elementary classrooms during the age of high-stakes test accountability and compares reading practices among schools of varying accreditation status and socio-economic status (SES). The current study partially replicates and extends a study conducted by Baumann, Hoffman, Duffy-Hester, and Ro in 2000. The Baumann et al. (2000) study provides a frame of reference to compare instructional practices prior to high stakes testing with those used in the current high stakes testing environment. Third- through fifth-grade teachers in seven school districts in central Virginia were asked to complete an electronic survey. Descriptive …

Good As We Know It: Goodness In Design Discourse Since 1870, Garreth C. Blackwell

Theses and Dissertations

This dissertation examines the ways in which design and design practitioners have defined value in the design discourse through the vocabulary and concept of goodness since 1870. These definitions of value have been central to design discourse both past and present and deal with the impact and purpose of design work as well as its role in the creation of the approaching future. Since before the coalescence of graphic design as a separate field of design, these questions have been tied to the form, function or social impact of the objects created by designers. Despite the prevalence of this line …

Weighted Quantile Sum Regression For Analyzing Correlated Predictors Acting Through A Mediation Pathway On A Biological Outcome, Bhanu M. Evani

Theses and Dissertations

Abstract

Weighted Quantile Sum Regression for Analyzing Correlated Predictors Acting Through a Mediation Pathway on a Biological Outcome

By

Bhanu M. Evani, Ph.D.

A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University.

Virginia Commonwealth University, 2017.

Major Director: Robert A. Perera, Asst. Professor, Department of Biostatistics

This work examines mediated effects of a set of correlated predictors using the recently developed Weighted Quantile Sum (WQS) regression method. Traditionally, mediation analysis has been conducted using the multiple regression method, first proposed by Baron and Kenny (1986), which has since …

Series Solutions Of Polarized Gowdy Universes, Doniray Brusaferro

Theses and Dissertations

Einstein's field equations are a system of ten partial differential equations. For a special class of spacetimes known as Gowdy spacetimes, the number of equations is reduced due to additional structure of two dimensional isometry groups with mutually orthogonal Killing vectors. In this thesis, we focus on a particular model of Gowdy spacetimes known as the polarized T³ model, and provide an explicit solution to Einstein's equations.

Low-Temperature Fabrication Process For Integrated High-Aspect Ratio Metal Oxide Nanostructure Semiconductor Gas Sensors, William Paul Clavijo

Theses and Dissertations

This work presents a new low-temperature fabrication process of metal oxide nanostructures that allows high-aspect ratio zinc oxide (ZnO) and titanium dioxide (TiO₂) nanowires and nanotubes to be readily integrated with microelectronic devices for sensor applications. This process relies on a new method of forming a close-packed array of self-assembled high-aspect-ratio nanopores in an anodized aluminum oxide (AAO) template in a thin (2.5 µm) aluminum film deposited on a silicon and lithium niobate substrate (LiNbO₃). This technique is in sharp contrast to traditional free-standing thick film methods and the use of an integrated thin aluminum film …

Effects Of Hydraulic Dredging And Vessel Operation On Atlantic Sturgeon Behavior In A Large Coastal River, Michael R. Barber

Theses and Dissertations

The tidal James River, a focus of VCU's Atlantic Sturgeon program, supports both commercial shipping and hydraulic dredging. These anthropogenic threats present documented but preventable sources of mortality to the endangered species. Using three separate VEMCO Positioning System (VPS) receiver arrays, spatial data of previously-tagged fish were collected. ArcGIS and Programita software were used to analyze fish spatial distributions in the presence and absence of potential threats, using additional data including automatic identification system (AIS) vessel locations, vessel passages compiled using camera footage, and dredge records provided by the US Army Corps of Engineers. The data showed a change in …

Synthesis And Characterization Of Metallic Nanoparticles For Catalytic Applications, Sarah Smith

Theses and Dissertations

In recent years, research has focused on reducing the cost of catalysts in a variety of ways including using less expensive materials, improving the synthetic method, and increasing the catalytic activity, recovery, and recyclability. Typically with nanoparticles, the size, shape, composition, and surface coating have an effect on catalytic activity.^1-2 In this work, we focused on reducing the cost of precious metal based catalysts by altering the synthetic methods.

One way to lower the cost of synthesizing precious metal nanoparticles is by debasing the precious metal with a second cheaper more abundant metal. CuPd nanoparticles were synthesized in oleylamine …

Positions Of Place: Converging Viewpoints In Visual Communication, Gregory J. Schmidt

Theses and Dissertations

This thesis includes a body of work that explores our visual relationship to the physical spaces and places we inhabit in our everyday lives. Today we live in a complex world where we are bombarded with fragments of information and inundated with distractions. As designers, we are equipped with tools and methods that allow us to experience and interpret our environment through multi-faceted perspectives and from different viewpoints. My approach to graphic design adopts techniques and practices from a mix of different disciplines. The work focuses on a design process that alternates between the parallel depiction of first-person and third-person …

Effect Of Charged Species On The Gradient Properties, Kayesh Ashraf

Theses and Dissertations

Surface chemical gradients are materials that exhibit continuous, gradually varying chemical or physical properties along and across the length of a substrate. As a result, each point on the gradient surface can represent an individual sample. They are broadly classified as chemical and physical gradients depending upon the properties that the gradient exhibits. A physical gradient involves a continuous variation of physical properties such as surface roughness and film porosity on the micrometer scale. Chemical gradients involve a gradual variation of chemical properties such as polarity, acidity and basicity, etc. Such gradients have found various applications in cell adhesion, nanoparticle …

Sol-Gel Chemistry: An Advanced Technique To Produce Macroscopic Nanostructures Of Metal And Semiconductor Colloids, Lamia Nahar

Theses and Dissertations

The fascinating physical properties that arise in materials limited to dimensions of 1-100 nm have gained noteworthy interest from the scientific community. Accordingly, there has been a lot of attention paid to the synthesis of discrete nanoparticles (NPs) and they are being investigated for a range of advanced technologies. Nonetheless, efficient use of nanomaterials in device applications require them to be assembled into solid state macro-structures while retaining their unique, nanoparticulate properties. To date, most commonly investigated assembling techniques include: covalent coupling of NPs surface groups, control evaporation of the solvent to produce ordered supercrystals or non-ordered glassy films, and …

A Novel Synthesis And Subsequent Decyclization Of Iminothiozolidinones: Expansion Of Thiourea Chemistry For Biological Applications, Constance D. Franklin

Theses and Dissertations

Small molecule synthesis has become a valuable tool in the study of biological systems. Biologically active compounds can be designed based on well-characterized endogenous systems or they can be found through the screening of large libraries of small molecules. This work involves the development of a small library of cyclic thiourea-based small molecules by use of an unreported synthetic pathway. Briefly, parent thioureas were cyclized by reaction with bromoacetyl bromide, and one or two isomeric heterocycles were found to form. Further studies indicated that the reaction could be easily manipulated by temperature or solvent to effectively control the product distribution. …

Sub For More, Chelsea Lee

Theses and Dissertations

This written thesis unpacks the thoughts and motivations behind the decisions I have made in my artistic practice that have ultimately culminated in my M.F.A. Thesis Exhibition: Sub for More. By merging images of my own work as well as internet sourced images of the culture that drives my work, I have created a platform to begin to understand my experience during graduate school. This text examines and explores my belief in the inherent power in pop culture, my obsession with fame, celebrity, and my self-identity as a participant in current pop-culture.

Development Of My Footprint Calculator, Karthik Mummidisetti

Theses and Dissertations

The Environmental footprint is a very powerful tool that helps an individual to understand how their everyday activities are impacting environmental surroundings. Data shows that global climate change, which is a growing concern for nations all over the world, is already affecting humankind, plants and animals through raising ocean levels, droughts & desertification and changing weather patterns. In addition to a wide range of policy measures implemented by national and state governments, it is necessary for individuals to understand the impact that their lifestyle may have on their personal environmental footprint, and thus over the global climate change. “My Footprint …

Synthetic Modeling Of Power Grids Based On Statistical Analysis, Seyyed Hamid Elyas 8045266

Theses and Dissertations

The development of new concepts and methods for improving the efficiency of power networks needs performance evaluation with realistic grid topology. However, much of the realistic grid data needed by researchers cannot be shared publicly due to the security and privacy challenges. With this in mind, power researchers studied statistical properties of power grids and introduced synthetic power grid topology as appropriate methodology to provide enough realistic power grid case studies. If the synthetic networks are truly representative and if the concepts or methods test well in this environment they would test well on any instance of such a network …

Ad Maiorem Dei Gloriam: The Jesuits In Albania, Ines A. Murzaku

Occasional Papers on Religion in Eastern Europe

When Pope Francis addressed students, teachers, and parents of the Jesuit schools of Italy and Albania in 2013, he discussed the core and the value of a Jesuit-Catholic education, which in essence follows St. Ignatius of Loyola’s Spiritual Exercises and the Constitutions of the Society of Jesus. The Jesuits in all multifarious activities and apostolates put Jesus in the center, thereby making him the prototype. It was Jesus who had trodden a novel way for the Society of Jesus to follow and that meant to live a meaningful life, live well, and live joyfully among the people they were serving. …

Cybersecurity Stovepiping, David Thaw

Nebraska Law Review

I. Introduction

II. The Concept of Stovepiping

III. Stovepiping in Cybersecurity ... A. Policy Making, Complexity, and Change ... B. Complex Passwords: A Case Study ... 1. Fundamentals of Password Complexity ... 2. “Guessability”—the False Assumption ... a. Password Guessing via Authentication (Login) Interfaces ... b. Password Guessing via Unprotected/Unsanitized Service ... c. Offline Password Attacks ... 3. “Defense in Depth”—Measuring Marginal Benefit

IV. Implications of the Stovepiping Disjuncture ... A. Addressing the Same Question … B. Overcoming Policy Entrenchment ... C. Risk-Analytic Framework for Cybersecurity

V. Conclusion

Application Of Agisoft Photoscan And Sediment Transport Modeling For The Analysis Of Sediment Wave Propagation Succeeding Gravel Augmentation, Oak Grove Fork Of The Clackamas River, Oregon, Mindi Lea Curran

Cal Poly Humboldt theses and projects

Application of agisoft photoscan and sediment transport modeling for the analysis of sediment wave propagation succeeding gravel augmentation, oak grove fork of the clackamas river, oregon

Mindi Lea Curran

Physical features in alluvial rivers such as riffles, gravel bars, pools, and side channels provide refugia, nutrients, and spawning and rearing habitat for anadromous fish and other aquatic organisms. The downstream transport of gravels that continuously replenish these features is prevented by dams, and often leads to a coarsened channel bed condition and other geomorphic changes that have negative impacts on aquatic organisms. Geomorphic change in rivers can be challenging to …

Psychological Consequences Of Genetic Testing, Jack Allen

Cal Poly Humboldt theses and projects

Direct-to-consumer genetic testing describes genetic testing which is done using online or mail in services, without the direct supervision of a counselor or physician. Individuals can order information about their ancestry, trait information, and even disease risk information. Online testing services have previously been prevented from offering certain types of genetic self-knowledge to consumers due to government regulation, however, there is little information available about how genetic self-knowledge may affect consumers. The present study evaluated whether simply believing oneself to be genetically disadvantaged could cause an individual to perform poorly on a working memory task.

University students participated in a …

Modeling The Spread Of Sudden Oak Death Across A Heterogeneous Landscape In Redwood National Park Using A Spatially-Explicit Epidemiological Model, Laura A. Morgan

Cal Poly Humboldt theses and projects

The pathogen Phytophthora ramorum, the causal agent of Sudden Oak Death (SOD), is responsible for the deaths of millions of oak (Quercus spp.) and tanoak (Notholithocarpus densiflorus) trees in California and Oregon (USA). A recent infection in Redwood National Park (RNP) in California (USA) provided an opportunity to adapt an existing SOD model to assess the efficacy of current and proposed management strategies. A common method of SOD treatment includes killing both infected and uninfected hosts in the area of infection, as well as the area surrounding the infection to create buffers to account for undetected …

The Differences In Academic Achievement In Fit, Healthy, And Unfit 7th Grade Students, David Pauls

Cal Poly Humboldt theses and projects

There is an abundance of research showing significant positive relationships between academic achievement and physical fitness. The purpose of this study was to examine the relationship between academic achievement and different levels of physical fitness. The participants were 283 7^th grade students from a small, rural middle school in Northern California during 2011/12, 2012/13, 2014/15 academic school years. Academic achievement data came from the STAR (Standardized Testing and Reporting) test and CAASPP (California Assessment of Student Learning and Progress) test. Physical fitness data came from the FITNESSGRAM Physical Fitness Test. A MANOVA was performed on the academic achievement and …

Multiscale Habitat Suitability Modeling For Canary Rockfish (Sebastes Pinniger) Along The Northern California Coast, Portia N. Saucedo

Cal Poly Humboldt theses and projects

Detailed spatially-explicit data of the potential habitat of commercially important rockfish species are a critical component for the purposes of marine conservation, evaluation, and planning. Predictive habitat modeling techniques are widely used to identify suitable habitat in un-surveyed regions. This study elucidates the predicted distribution of canary rockfish (Sebastes pinniger) along the largely un-surveyed northern California coast using data from visual underwater surveys and predictive terrain complexity covariates. I used Maximum Entropy (MaxEnt) modelling software to identify regions of suitable habitat for S. pinniger greater than nine cm in total length at two spatial scales. The results of …

Enhancing The Acquisition Of Discipline-Specific Vocabulary Through Student Concordancing, David W. Longstreth Jr.

Cal Poly Humboldt theses and projects

This Master’s Project focuses on advanced-level English learners' acquisition of discipline-specific vocabulary as they transition from intensive English programs into English-medium university coursework. During this period, the number of discipline-specific terms students must master quickly and independently can be overwhelming. To address this problem, this M.A. Project argues that vocabulary-acquisition strategies should be foregrounded in intensive English programs, and that instructors should train students to supplement traditional vocabulary learning methods with independent concordancing strategies. Using concordancers, students can research vocabulary items by scanning a corpus (a large collection of texts) to retrieve examples of discipline-specific terms within authentic texts, revealing …

Forward Osmosis For Wastewater Treatment And Energy Recovery: A Techno-Economic Analysis, Patrick William Buckwalter

Cal Poly Humboldt theses and projects

A novel wastewater treatment system was investigated using forward osmosis membranes to treat municipal wastewater. Treatment by forward osmosis was determined to cost $10 million per million gallons per day (MGD) of wastewater capacity over a 20-year lifetime, with an energy consumption of 870 kWh per million gallons. A case study at the Arcata Wastewater Treatment Plant was conducted to investigate a treatment system that combines energy recovery from algae biomass with forward osmosis membrane treatment using local seawater as a draw solution. Total system cost was calculated to be $29.7 million over a 20-year lifetime with a 2.3 MGD …

The Benefits Of Arts Education In Second Language Acquisition And In Pedagogy, Christina Marie Lastra

Cal Poly Humboldt theses and projects

This literature review provides a look into some of the available scholarly literature on the benefits of arts education in second language acquisition and in pedagogy. It considers various aspects, concepts and implementations of arts education and the academic benefits that result. This paper also includes my own efforts as an educator in using arts education in my lesson planning and the outcomes within my classroom from my Spanish students and how they coincide with the scholarly literature.

Comparison Of The Role Of The Renin-Angiotensin Aldosterone System In The Genesis Ofhypertension Between Two Groups Of Nonhunting Dogs And Hunting Dogs, Elvira Hadziahmetovic Jurida, Jasmin Ferizbegovic, Stjepan Krcmar

Turkish Journal of Veterinary & Animal Sciences

The role of the renin-angiotensin aldosterone system in the genesis of hypertension between nonhunting dogs and hunting dogs of various breeds was comparatively studied in the city of Tuzla (Bosnia and Herzegovina). Sixty dogs were divided into four subgroups based on different age categories. Hypertension was recorded in 21 dogs or in 35% of examined dogs. Fourteen dogs had mild (23.3%), 5 dogs had moderate (8.3%), and 2 dogs had severe hypertension (3.3%). The most cases of hypertension (n = 9) were recorded in hunting dogs aged from 9 to 12 years. In subgroups of nonhunting and hunting dogs aged …

Some Reproductive, Lactation, And Kid Growth Characteristics Ofkilis Goats Under Semiintensive Conditions, Mahmut Keski̇n, Sabri̇ Gül, Osman Bi̇çer, İrfan Daşkiran

Turkish Journal of Veterinary & Animal Sciences

This study was carried out to determine some reproductive and kid growth characteristics as well as some lactation traits of Kilis goats raised under semiintensive conditions in Kilis Province in Turkey. The animal material of the study comprised 502, 698, and 753 heads of Kilis goats in 2013, 2014, and 2015, respectively. At the end of study, multiple birth rates were calculated between 31.5% and 35.7% during the years. Lactation length and lactation milk yield were determined to be between 207.1 ± 0.81 and 232.4 ± 0.65 days and between 315.7 ± 4.16 l and 375.6 ± 3.4 L, respectively …

Open-Access Crime Maps As Digital Rhetoric And Crime Reporting In Chicago: Using New Aesthetic Overlaps To Change Journalism And Citizen Interaction, Aaron Geiger

Graduate Theses, Dissertations, and Problem Reports (ETD)

When data mining meets the rhetoric of maps and crowdsourcing in the age of digital journalism, we can use the abundance of data to change, modify or reinforce particular reporting behaviors or journalism policies. We also live in an age of overlapping boundaries of technologies, algorithms and human interfaces---it is within these overlaps that we find anomalies, "glitches", and digital errata that can expose different perceptions of the same artifacts and algorithms. The overlapping of the heterogeneous network, as James Bridle calls it, is known as The New Aesthetic. It is not a movement, but "a series of artifacts ... …

On The Matroid Intersection Conjecture, Shadisadat Ghaderi

Graduate Theses, Dissertations, and Problem Reports (ETD)

In this dissertation, we investigate the Matroid Intersection Conjecture for pairs of matroids on the same ground set, proposed by Nash-Williams in 1990. Originally, the conjecture was stated for finitary matroids only, but we consider it for general matroids and introduce new approaches to attack the conjecture.;The first approach is to consider the situation when it is possible to make a finite modification to the matroids after which the pair satisfies the conjecture. In such a situation we say that the pair has the Almost Intersection Property. We prove that any pair of matroids with the Almost Intersection Property must …

On Factors That Influence User Interactions With Social Media Spam: Empirical Exploration Based On A Survey And Experiment, Thomas J. Kyanko

Graduate Theses, Dissertations, and Problem Reports (ETD)

This thesis explores various factors that influence whether or not users of social media platforms will interact with spam. The research is based on using survey and experimental approaches. The survey looked at several spam related behaviors: ability to identify spam, tendency to interact with spam, and tendency to report spam. In total 256 responses were analyzed, which were collected by an online survey system. Results of the survey show that education about spam did not correlate with changes in behavior, even when users reported that the education had an effect on them. Several other factors, commonly thought to be …