Digital Commons Network^™

An Investigation Into The Prediction Of Double-Skin Penetration Within Chromite Molds And Cores In Heavy Section Steel Casting Using Process Simulation Software, Nathaniel Bryant

Dissertations and Theses @ UNI

This investigation was conducted in response to a commercial steel foundry approaching the University of Northern Iowa for assistance with a recurring defect they experienced on a production casting. The defect was described as a mass of metal that penetrated and consumed the interstices of their chromite molds and cores, and it was determined to consist of fayalite. After an extensive literature review, it was concluded that the foundry experienced the double-skin defect, a niche quality issue that most commonly occurs in heavy-section steel casting with chromite molding materials

After it was determined that the double-skin defect was occurring, a …

Increasing Student Perceptions Of Success And Inclusion Through Strategic Programming Of Underrepresented Composers, Joyce J. Beyer

Dissertations and Theses @ UNI

There is a disproportional representation of women and people of color in orchestra and classical music. Both on the stage and in the music being performed, white and male musicians are more prominent than women and people of color. This disproportionality impacts underrepresented people, especially young students.

A study was done to see if introducing students to successful women and people of color who were musicians would increase student perceptions of success and inclusion in orchestra. The study included 37 students from 5 public school orchestra programs. The treatment was a series of pre-designed mini-lessons on underrepresented musicians. Growth was …

Motivation To Call Police: The Exploration Of Racial And Risk Averse Motivation, Alivia Lauren Zubrod

Dissertations and Theses @ UNI

When calls are made to the police, the magnitude of their impact is often overlooked. When calls are made to the police and there is no crime, police resources, time, and energy could be wasted (Sampson, 2002); however, when no call is made to the police and there is a crime, human lives could be put in danger (e.g., Felson, Messner, Hoskin, & Deane, 2002). Based on highly publicized news reports, it appears that being a racial minority is enough motivation to call the police in some situations (e.g., napping or humanitarian work; Griggs, 2018; Williams, 2018b). Aversive racism theory …

Seeing The Forest For The Trees: Elementary Stem Environments That Nurture Creativity And Innovation, Lisa Jo Chizek

Dissertations and Theses @ UNI

This study examined creativity in schools through the lens of nine rural Midwestern public school fifth grade students in a student-centered, inquiry-based science classroom within a STEM Framework. Previous literature suggesting the importance of nurturing creativity in schools (Florida, 2004; Executive Office of the President, 2018; K. H. Kim, 2016; Csikszentmihalyi, 1999) inspired the purpose for this dissertation. What is missing is the perspective of creative youth. Phenomenology as a research method is a “systematic attempt to uncover and describe the structures, the internal meaning structures, of lived experiences” (van Manen, 2016, p. 10). Through student voices, this qualitative study …

Exploring The Knowledge And Behavior Needed To Prevent Osteoporosis Among Saudi Women, Zahra Al Khidhr

Dissertations and Theses @ UNI

The purpose of this research is to evaluate the knowledge as well as the behavior necessary to prevent osteoporosis among Saudi women. Also, this study aims to evaluate the level of knowledge on osteoporosis prevention activities and determine women’s perception about the most important factors that increase the occurrence of osteoporosis. This study sheds light on women’s understanding of the connection between physical activity and calcium intake to prevent osteoporosis as well as determining how education programs can increase women’s understanding of preventing osteoporosis. A quantitative cross-sectional design was utilized for this study and self-administered questionnaire was used for data …

The Marginalization Of Black Aspiring Lawyers, Aaron N. Taylor

FIU Law Review

No abstract provided.

Umpires, Judges, And The Aesthetics Of The Infield Fly, Chad M. Oldfather

FIU Law Review

No abstract provided.

Machine-Learning-Based Pml For The Fdtd Method, He Ming Yao, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this letter, a novel absorbing boundary condition (ABC) computation method for finite-difference time-domain (FDTD) is proposed based on the machine learning approach. The hyperbolic tangent basis function (HTBF) neural network is introduced to replace traditional perfectly matched layer (PML) ABC during the FDTD solving process. The field data on the interface of conventional PML are employed to train HTBF-based PML model. Compared to the conventional approach, the novel method greatly decreases the size of a computation domain and the computation complexity of FDTD because the new model only involves the one-cell boundary layer. Numerical examples are provided to benchmark …

Full Transparency: A Case Against The Collection Of Internet Information In Trump-Era American Immigration, Thomas P. Campbell

FIU Law Review

No abstract provided.

Facial Re-Enactment, Speech Synthesis And The Rise Of The Deepfake, Nicholas Gardiner

Theses : Honours

Emergent technologies in the fields of audio speech synthesis and video facial manipulation have the potential to drastically impact our societal patterns of multimedia consumption. At a time when social media and internet culture is plagued by misinformation, propaganda and “fake news”, their latent misuse represents a possible looming threat to fragile systems of information sharing and social democratic discourse. It has thus become increasingly recognised in both academic and mainstream journalism that the ramifications of these tools must be examined to determine what they are and how their widespread availability can be managed.

This research project seeks to examine …

Image-Based Sexual Abuse: A Qualitative Exploration Of The Lived Experience And Perceived Consequences For Women, Brienna L. Webb

Theses : Honours

Being a highly convoluted and contemporaneous issue, defining and conceptualising image based sexual abuse has proved difficult for scholars. Although research on image-based sexual abuse is limited, previous inquiries have identified serious consequences and accumulative harms for affected individuals. I aimed to explore the lived experience and consequences of image-based sexual abuse as identified by women, in an attempt to taper the research dearth on this phenomenon. An in-depth qualitative phenomenological exploration of seven women’s experiences of image-based sexual abuse saw five overarching themes emerge from participants’ discourse. The themes comprised mental health impacts; perceptions of self; loss of control; …

Gamma Irradiation Response Of Photonic Crystal And Standard Optical Fibre Bragg Grating Sensors For Radiation Dosimetry, Desmond Baccini

Theses: Doctorates and Masters

This study investigates the use of Optical Fibre Bragg Grating Sensors (FBGs) for Gamma Radiation Dosimetry. A comparative analysis of responses to gamma irradiation between standard commercial FBGs and new generation FBGs written in Photonic Crystal fibre (PCF) were examined under similar regimes and conditions. Current research suggests that the FBGs performance, when exposed to Cobalt-60 gamma irradiation, can suffer cross sensitivity problems resulting from different external effects such as temperature. However, FBGs written in PCFs may be able to overcome these problems due to their design, flexibility of the shape, and size of the micro-holes in a PCF.

Previous …

Resistance, Extinction, And Everything In Between – The Diverse Responses Of Seaweeds To Marine Heatwaves, Sandra C. Straub, Thomas Wernberg, Mads S. Thomsen, Pippa J. Moore, Michael T. Burrows, Ben P. Harvey, Dan A. Smale

Research outputs 2014 to 2021

Globally, anomalously warm temperature events have increased by 34% in frequency and 17% in duration from 1925 to 2016 with potentially major impacts on coastal ecosystems. These “marine heatwaves” (MHWs) have been linked to changes in primary productivity, community composition and biogeography of seaweeds, which often control ecosystem function and services. Here we journalarticle the literature on seaweed responses to MHWs, including 58 observations related to resistance, bleaching, changes in abundance, species invasions and local to regional extinctions. More records existed for canopy-forming kelps and bladed and filamentous turf-forming seaweeds than for canopy-forming fucoids, geniculate coralline turf and crustose coralline …

The Prospect Of 'Chindia' As A World Power, Jonathan D. James

Research outputs 2014 to 2021

A significant global development in the first decade of the 21st Century has been the rise of several nationshitherto not considered key players in the international scene. The following up and coming nations have recentlybeen grouped respectively as BRIC and BASIC: Brazil, Russia, India, and China (BRIC); and Brazil, South Africa,India, and China (BASIC) (Wilson & Purushothaman, 2003). Noticeably, the two nations featured in both thesegroupings are China and India. China’s and India’s meteoric rise to the global arena, and the sheer magnitude oftheir populations, has led some scholars to assert that there is an ‘irresistible’ shift of global power …

Multiple Perspectives On Attachment Theory: Investigating Educators’ Knowledge And Understanding, Nadia Wilson-Ali, Caroline Barratt-Pugh, Marianne Knaus

Research outputs 2014 to 2021

This paper presents findings from a study investigating the multiple perspectives of attachment theory and practice through the voices of early childhood educators. Attachment theory has influenced research, policy and practice over the last six decades, offering a framework for understanding risk and protective factors in early childhood. Despite the increasing literature highlighting the importance of attachment relationships, attachment theory has been primarily considered from a medical health or psychological perspective and little is known about educators’ perspectives of attachment theory. In total, 488 Australian educators responded to the online survey, demonstrating a wide interest in the topic of attachment. …

Spheroid-3d And Monolayer-2d Intestinal Electrochemical Biosensor For Toxicity/Viability Testing: Applications In Drug Screening, Food Safety, And Environmental Pollutant Analysis, Evangelia Flampouri, Shahzad Imar, Kieran O'Connell, Baljit Singh

Articles

The rise of three-dimensional cell culture systems that provide in vivo-like environments for pharmaco-toxicological models has prompted the need for simple and robust viability assays suitable for complex cell architectural structures. This study addresses that challenge with the development of an in vitro enzyme based electrochemical sensor for viability/cytotoxicity assessment of two-dimensional (2D) monolayer and three-dimensional (3D) spheroid culture formats. The biosensor measures the cell viability/toxicity via electrochemical monitoring of the enzymatic activity of nonspecific esterases of viable cells, through the hydrolysis of 1-naphthyl acetate to 1-naphthol. The proposed sensor demonstrated strong correlation (r = 0.979) with viable …

Levering, Matthew. Engaging The Doctrine Of The Holy Spirit: Love And Gift In The Trinity And The Church. Grand Rapids: Baker Academic, 2016. V + 440 Pp. Hardcover. Usd 45.00., Gerardo Oudri

Andrews University Seminary Studies (AUSS)

No abstract provided.

Law And Order In Ancient Athens [Review] / Lanni, Adriaan., Kenneth Bergland

Andrews University Seminary Studies (AUSS)

Book Review

Worldviews: Concepts Or Narratives? An Integrative Definition To Assess Their Controlling Effect In The Biblical And Atheistic Evolutionary Models, Flavio Prestes Iii

Andrews University Seminary Studies (AUSS)

What are worldviews? What are their characteristics? How do they work? This article offers tentative responses to these questions through the integration of concepts and narratives. Using the biblical and the atheistic evolutionary narratives as case studies, it also seeks to show how worldviews have a significant, though not absolute, controlling effect on one’s perception of reality.

Being Biblical In A Pluralistic Age

Andrews University Seminary Studies (AUSS)

One way to define a disciple is “a follower of someone’s words.” In a pluralistic age, there are many words beckoning would-be disciples to particular ways of life, all promising some kind of wellness. These word-ways are ingredients of worldviews, a program or map for orienting oneself in the world. Worldviews answer core questions about human existence, often in the form of a story. This essay argues that contemporary pluralism is the result of abandoning the Bible as our control story, a loss that is as much a failure of what Charles Taylor calls the social imaginary. If this diagnosis …

God’S Library: The Archaeology Of The Earliest Christian Manuscripts [Review] / Nongbri, Brent., Christopher R. Chadwick

Andrews University Seminary Studies (AUSS)

Book Review

Performing ‘Teacher’: Exploring Early Career Teachers’ Becomings, Work Identities And The [Mis-]Use Of The Professional Standards In Competitive Educational Assemblages, Kirsten Lambert, Christina Gray

Research outputs 2014 to 2021

This paper explores the relationship between early career teachers’ (ECTs) work identities, neoliberal education assemblages, and mandated professional standards. The task of supporting and retaining beginning teachers has received considerable attention in recent years in the face of alarming rates of teacher attrition internationally. The study, undertaken in Western Australia, explores how ECTs construct identities in response to competitive educational discourses, high levels of individual stress, insecure employment, excessive work-loads and limited formal support. The Australian Professional Standards are an example of ‘organisational learning’ that aims to support ECTs. However, our research suggests that in practice a managerial ‘tick the …

Public Perception Of Drones… Or Should That Be Remotely Piloted Aircraft Systems?, Graham Wild, John Murray, Ayiei Ayiei, Mithun Abdul Sathar Eqbal, Eranga Batuwangala

Research outputs 2014 to 2021

The media coverage of remotely piloted aircraft systems (RPAS) has highlighted some issues, particularly in terms of security and privacy concerns. As such, it is essential to understand the public's perception towards these systems. The purpose of this study was to assess the public's perception towards 1) The terminology used to define RPAS, which varies across the industry; 2) The applications, current and future, of RPAS; 3) The future of passenger transport involving RPAS, and 4) RPAS in general. It was found that there was little difference between the "terms" used to describe RPAS; however, there was a significant difference …

The Effect Of Volunteers’ Care And Support On The Health Outcomes Of Older Adults In Acute Care: A Systematic Scoping Review, Rosemary Saunders, Karla Seaman, Renée Graham, Angela Christiansen

Research outputs 2014 to 2021

Aim: To examine the available evidence on the effects of care and support provided by volunteers on the health outcomes of older adults in acute care services.

Background: Acute hospital inpatient populations are becoming older, and this presents the potential for poorer health outcomes. Factors such as chronic health conditions, polypharmacy and cognitive and functional decline are associated with increased risk of health care‐related harm, such as falls, delirium and poor nutrition. To minimise the risk of health care‐related harm, volunteer programmes to support patient care have been established in many hospitals worldwide.

Design: A systematic scoping review.

Methods: The …

Investigating The Effect Of [C8py][Cl] And [C18py][Cl] Ionic Liquids On The Water/Oil Interfacial Tension By Considering Taguchi Method, Siamak Najimi, Iman Nowrouzi, Abbas Khaksar Manshad, Mehdi Hojjat Farsangi, Ali Zeinolabedini Hezave, Jagar A. Ali, Alireza Keshavarz, Amir H. Mohammadi

Research outputs 2014 to 2021

Capillary and interfacial forces are of great influences of trapping hydrocarbon in porous media after primary and secondary recovery processes. The trapped crude oil in the reservoir can be mobilized and produced by reducing these forces. Thus, surfactant flooding, as a main enhanced oil recovery (EOR) method, is usually applied to reduce the interfacial tension (IFT) of crude oil–water system in porous medium and improves the oil recovery. This study focused on the effect of [C8Py][Cl] and [C18Py][Cl] ionic liquids (ILs), as a new family of surfactant, in combination with various salts including sodium chloride, potassium chloride, magnesium sulfate and …

Residual Trapping Of Co2 In An Oil-Filled, Oil-Wet Sandstone Core: Results Of Three-Phase Pore-Scale Imaging, Stefan Iglauer, Adriana Paluszny, Taufiq Rahman, Yihuai Zhang, Wolfgang Wülling, Maxim Lebedev

Research outputs 2014 to 2021

CO2 geosequestration in oil reservoirs is an economically attractive solution as it can be combined with enhanced oil recovery (CO2-EOR). However, the effectiveness of the associated three-phase displacement processes has not been tested at the micrometer pore scale, which determines the overall reservoir-scale fluid dynamics and thus CO2-EOR project success. We thus imaged such displacement processes in situ in 3-D with X-ray microcomputed tomography at high resolution at reservoir conditions and found that oil extraction was enhanced substantially, while a significant residual CO2 saturation (13.5%) could be achieved in oil-wet rock. Statistics of the residual CO2 and oil clusters are …

Recent Climate-Driven Ecological Change Across A Continent As Perceived Through Local Ecological Knowledge, Suzanne M. Prober, Nat Raisbeck-Brown, Natasha B. Porter, Kristen J. Williams, Zoe Leviston, Fiona Dickson

Research outputs 2014 to 2021

Documenting effects of climate change is an important step towards designing mitigation and adaptation responses. Impacts of climate change on terrestrial biodiversity and ecosystems have been well-documented in the Northern Hemisphere, but long-term data to detect change in the Southern Hemisphere are limited, and some types of change are generally difficult to measure. Here we present a novel approach using local ecological knowledge to facilitate a continent-scale view of climate change impacts on terrestrial biodiversity and ecosystems that people have perceived in Australia. We sought local knowledge using a national web-based survey, targeting respondents with close links to the environment …

Role Of Lactic Acidosis As A Mediator Of Sprint-Mediated Nausea, Robert J. Merrells, Ashely J. Cripps, Paola T. Chivers, Paul A. Fournier

Research outputs 2014 to 2021

This study aims to determine whether there is a relationship between nausea level and lactic acidosis during recovery from sprinting. In all, 13 recreationally active males completed a 60 s bout of maximal intensity cycling. Prior to and for 45 min following exercise, blood pH, pCO₂, and lactate levels were measured together with nausea. In response to sprinting, nausea, lactate, and H⁺ concentrations increased and remained elevated for at least 10 min (p < .001), whereas pCO₂ increased only transiently (p < .001) before falling below pre‐exercise levels (p < .001), with all these variables returning toward pre‐exercise levels during recovery. Both measures of nausea adopted for analyses (nausea profile, NP; visual analogue scale, VAS), demonstrated significant repeated measures correlation (rmcorr) post‐exercise between nausea and plasma lactate (VAS and NPr_rm> 0.595, p < .0001) and H⁺ concentrations (VAS and NPr_rm> 0.689, p < .0001), but an inconsistent relationship with pCO₂ (VAS r_rm = …

Preparation And Characterization Of Avenin-Enriched Oat Protein By Chill Precipitation For Feeding Trials In Celiac Disease, Greg Tanner, Angéla Juhász, Christakis George Florides, Mitchell Nye-Wood, Frank Békés, Michelle L. Colgrave, Amy K. Russell, Melinda Y. Hardy, Jason A. Tye-Din

Research outputs 2014 to 2021

The safety of oats for people with celiac disease remains unresolved. While oats have attractive nutritional properties that can improve the quality and palatability of the restrictive, low fiber gluten-free diet, rigorous feeding studies to address their safety in celiac disease are needed. Assessing the oat prolamin proteins (avenins) in isolation and controlling for gluten contamination and other oat components such as fiber that can cause non-specific effects and symptoms is crucial. Further, the avenin should contain all reported immunogenic T cell epitopes, and be deliverable at a dose that enables biological responses to be correlated with clinical effects. To …

Post-Activation Potentiation Versus Post-Activation Performance Enhancement In Humans: Historical Perspective, Underlying Mechanisms, And Current Issues, Anthony J. Blazevich, Nicolas Babault

Research outputs 2014 to 2021

Post-activation potentiation (PAP) is a well-described phenomenon with a short half-life (~28 s) that enhances muscle force production at submaximal levels of calcium saturation (i.e., submaximal levels of muscle activation). It has been largely explained by an increased myosin light chain phosphorylation occurring in type II muscle fibers, and its effects have been quantified in humans by measuring muscle twitch force responses to a bout of muscular activity. However, enhancements in (sometimes maximal) voluntary force production detected several minutes after high-intensity muscle contractions are also observed, which are also most prominent in muscles with a high proportion of type II …