Digital Commons Network^™

A Graph Automorphic Approach For Placement And Sizing Of Charging Stations In Ev Network Considering Traffic, Hossein Parastvand, Valeh Moghaddam, Octavian Bass, Mohammad A.S. Masoum, Airlie Chapman, Stefan Lachowicz

Research outputs 2014 to 2021

This paper proposes a novel graph-based approach with automorphic grouping for the modelling, synthesis, and analysis of electric vehicle (EV) networks with charging stations (CSs) that considers the impacts of traffic. The EV charge demands are modeled by a graph where nodes are positioned at potential locations for CSs, and edges represent traffic flow between the nodes. A synchronization protocol is assumed for the network where the system states correspond to the waiting time at each node. These models are then utilized for the placement and sizing of CSs in order to limit vehicle waiting times at all stations below …

Stable Dispersion Of Coal Fines During Hydraulic Fracturing Flowback In Coal Seam Gas Reservoirs - An Experimental Study, Faisal Ur Rahman Awan, Alireza Keshavarz, Hamed Akhondzadeh, Sarmad Al-Anssari, Ahmed Al-Yaseri, Ataollah Nosrati, Muhammad Ali, Sefan Iglauer

Research outputs 2014 to 2021

In subterranean coal seam gas (CSG) reservoirs, massive amounts of small-sized coal fines are released during the production and development stages, especially during hydraulic fracturing stimulation. These coal fines inevitably cause mechanical pump failure and permeability damage due to aggregation and subsequent pore-throat blockage. This aggregation behavior is thus of key importance in CSG production and needs to be minimized. Consequently, such coal fines dispersions need to be stabilized, which can be achieved by the formulation of improved fracturing fluids. Here, we thus systematically investigated the effectiveness of two additives (ethanol, 0.5 wt % and SDBS, 0.001 and 0.01 wt …

Thermal-Hydraulic Performance In A Microchannel Heat Sink Equipped With Longitudinal Vortex Generators (Lvgs) And Nanofluid, Basel Al Muallim, Mazlan A. Wahid, Hussain A. Mohammed, Mohammed Kamil, Daryoush Habibi

Research outputs 2014 to 2021

In this study, the numerical conjugate heat transfer and hydraulic performance of nanofluids flow in a rectangular microchannel heat sink (RMCHS) with longitudinal vortex generators (LVGs) was investigated at different Reynolds numbers (200-1200). Three-dimensional simulations are performed on a microchannel heated by a constant temperature with five different configurations with different angles of attack for the LVGs under laminar flow conditions. The study uses five different nanofluid combinations of Al2O3 or CuO, containing low volume fractions in the range of 0.5% to 3.0% with various nanoparticle sizes that are dispersed in pure water, PAO (Polyalphaolefin) or ethylene glycol. The results …

Synergistic Effect Of Hydrophilic Nanoparticles And Anionic Surfactant On The Stability And Viscoelastic Properties Of Oil In Water (O/W) Emulations; Application For Enhanced Oil Recovery (Eor), Sarmad Al-Anssari, Zain-Ul-Abedin Arain, Haider A. Shanshool, Alireza Keshavarz, Mohammad Sarmadivaleh

Research outputs 2014 to 2021

With the rapidly increased global energy demand, great attention has been focused on utilizing nanotechnology and particularly nanofluids in enhanced oil recovery (EOR) to produce more oil from low-productivity oil reservoirs. Nanofluid flooding has introduced as one of the promising methods for enhanced oil recovery using environment-friendly nanoparticles (NPs) to be as an innovative-alternative for chemical methods of EOR. This work investigates the synergistic effects of anionic surfactant and hydrophilic silica nanoparticles on the stability and the mechanical behavior of oil in water (O/W) emulsions for their application in EOR. To achieve this, an extensive series of experiments were conducted …

A Comparison Of Dietary Intake Of Children/Adolescents With And Without Myopia, Niamh Burke, John Butler, Daniel Ian Flitcroft, James Loughman

Conference Papers

Myopia is caused by an eye which has grown too long. The prevalence of myopia has increased drastically in recent years and half of the world’s population is expected to be myopic by 2050.(1) Consequently, a significant increase in sight threatening diseases will follow.(1) Myopia most commonly develops in youth, and we now know that environmental factors affect its development. Nutritional status strongly influences growth and development, including that of the eye. It has been hypothesised, therefore, that nutrition may play a role in this excessive eye growth. Current findings are conflicted, with a clear gap in the evidence.(2,3) Therefore, …

Galaxy And Mass Assembly (Gama): Properties And Evolution Of Red Spiral Galaxies, Smriti Mahajan, Kriti Kamal Gupta, Rahul Rana, M. J.I. Brown, S. Phillipps, Joss Bland-Hawthorn, M. N. Bremer, S. Brough, Benne W. Holwerda, A. M. Hopkins, J. Loveday, Kevin Pimbblet, Lingyu Wang

Faculty and Staff Scholarship

We use multiwavelength data from the Galaxy And Mass Assembly (GAMA) survey to explore the cause of red optical colours in nearby (0.002 < z < 0.06) spiral galaxies. We show that the colours of red spiral galaxies are a direct consequence of some environment-related mechanism(s) that has removed dust and gas, leading to a lower star formation rate. We conclude that this process acts on long time-scales (several Gyr) due to a lack of morphological transformation associated with the transition in optical colour. The specific star formation rate (sSFR) and dust-to-stellar mass ratio of red spiral galaxies is found to be statistically lower than blue spiral galaxies. On the other hand, red spirals are on average 0.9 dex more massive, and reside in environments 2.6 times denser than their blue counterparts. We find no evidence of excessive nuclear activity, or higher inclination angles to support these as the major causes for the red optical colours seen in ≳47 per cent of all spirals in our sample. Furthermore, for a small subsample of our spiral galaxies that are detected in H I, we find that the SFR of gas-rich red spiral galaxies is lower by ∼1 dex than their blue counterparts.

Comparative Analysis Of The Translocation Kinetics For Clpa’S Atpase Domains 1 & 2, Nathaniel Scull

All ETDs from UAB

ClpA, a Class I AAA+ (ATPases Associated with various cellular Activities) motor, as-sembles into a tiered hexamer containing two AAA+ nucleotide binding domains (NDBs), D1 and D2. These NBDs couple nucleotide triphosphate binding and hydrolysis to mechanical work that drives polypeptide unfolding and translocation. Here we study the kinetic mechanisms of polypeptide translocation at the two domains to elucidate their contributions to the overall wildtype activity of ClpA. We subjected Walker B variants of ClpA that lack ATPase activity in one of the two domains to single-turnover stopped-flow techniques using a new fluorescence anisotropy and total fluorescence method. We found …

Theory Protection In Human Associative Learning And Formally Representing Uncertainty About Novel Stimuli, Stuart Spicer

Other Faculty of Health Theses

Three collections of data are presented in this thesis, with the broad aim of investigating a potential role for theory protection in human associative learning. According to theory protection, people should resist updating their existing knowledge (i.e. resist new learning), even when faced with evidence that contradicts what they already know. In other words, people should maintain established associations between environmental cues and outcomes wherever possible. Theory protection differs from typical prediction error accounts of learning (e.g. Bush & Mosteller, 1951; Rescorla & Wagner, 1972; Rescorla, 2001). According to prediction error accounts, people should update existing associations (i.e. learn) most …

Social Connectedness And Financial Independence Strategies Supporting Nonprofit Sustainability, Christopher Edmund Maylor

Walden Dissertations and Doctoral Studies

Leaders of nonprofit organizations (NPOs) often lack strategies to ensure the sustainability of their organizations beyond initial funding, resulting in significant risk to program continuity. Grounded in social entrepreneurship theory, the purpose of this qualitative single-case study was to explore strategies used by 3 leaders of a small NPO in the southwest region of the United States. Data were collected from semistructured interviews and a review of organizational documents. Through thematic analysis, 6 social themes emerged: optimization of business strategies, income and donor growth, program cost management, funding diversification, program licensing, and public awareness of NPO programs. The contributions to …

Enhancing Grit In Elite Athletes Through Functional Imagery Training, Jon Rhodes

Other Faculty of Health Theses

Grit has been researched across a wide variety of domains with negative correlations to drop out rates and positive associations to performance. However, there has been little to empirically change character through interventions, and even fewer in sport. A total of six studies are presented through a mixed-method approach to initially gain an understanding how grit is created, and the processes involved in developing the trait (Studies One and Two). From the phenomenological findings, a bespoke Functional Imagery Training (FIT) intervention is initially tailored to athletes and delivered (Study Three). With ceiling effects present from our performance athletes (and those …

Geometrical Investigation Of A U-Shaped Oscillating Water Column Wave Energy Device, De Zhi Ning, Bao Ming Guo, Rong Quan Wang, Thomas Vyzikas, Deborah Greaves

School of Engineering, Computing and Mathematics

No abstract provided.

How Can Technology Support Ageing In Place In Healthy Older Adults? A Systematic Review, A Ollevier, G Aguiar, M Palomino, Is Simpelaere

School of Engineering, Computing and Mathematics

Abstract Background Ageing in place has recently gained visibility in healthcare policies and services. Technology has the potential to facilitate independence at home. The objective of this systematic review is to identify technologies that have been rigorously evaluated for supporting the ageing in place of healthy older adults. As well we explored the methods in engagement with technology in healthy older adults. Methods Databases Pubmed, Scopus, PsycInfo and Cinahl were consulted for clinical controlled trials or randomised controlled trials between 2014 and 2019. Studies were included if they contained a technological intervention and focussed on supporting healthy older adults’ independent …

Ecological Mechanisms Explaining Interactions Within Plant–Hummingbird Networks: Morphological Matching Increases Towards Lower Latitudes, J Sonne, J Vizentin-Bugoni, Pk Maruyama, Ac Araujo, E Chávez-González, Ag Coelho, Pa Cotton, Oh Marín-Gómez, C Lara, Lr Lasprilla, Cg Machado, Ma Maglianesi, Ts Malucelli, Amm González, Gm Oliveira, Pe Oliveira, R Ortiz-Pulido, Ma Rocca, Lc Rodrigues, I Sazima, Bi Simmons, B Tinoco, Ig Varassin, Mf Vasconcelos, B O'Hara, M Schleuning, C Rahbek, M Sazima, B Dalsgaard

School of Biological and Marine Sciences

Interactions between species are influenced by different ecological mechanisms, such as morphological matching, phenological overlap and species abundances. How these mechanisms explain interaction frequencies across environmental gradients remains poorly understood. Consequently, we also know little about the mechanisms that drive the geographical patterns in network structure, such as complementary specialization and modularity. Here, we use data on morphologies, phenologies and abundances to explain interaction frequencies between hummingbirds and plants at a large geographical scale. For 24 quantitative networks sampled throughout the Americas, we found that the tendency of species to interact with morphologically matching partners contributed to specialized and modular …

Power Extraction By A Water Turbine In Inviscid Free Surface Flow With Vertical Shear, J Lin, A. G.L. Borthwick, B Lin, S. Draper

School of Engineering, Computing and Mathematics

No abstract provided.

Incompressible Sph Simulation Of Flow Past Horizontal Cylinder Between Plane Wall And Free Surface, Burniadi Moballa, Ming Jyh Chern, A. G.L. Borthwick

School of Engineering, Computing and Mathematics

No abstract provided.

Dispatches From The Collusion Inquiry: A Tribute To The Honourable Peter Cory, Renee M. Pomerance

Fordham International Law Journal

No abstract provided.

Expatriate-Teacher Turnover In The International School Industry Of China, Richard Ik Ihejieto

Walden Dissertations and Doctoral Studies

Expatriate-teacher turnover disrupts the social and academic lives of students in the international school industry of China. The human resource budgets of these schools are unsustainable and expatriate-teacher turnover significantly affects globalization and international businesses. The rate of expatriate-teacher turnover in the international school industry of China, which results in financial losses and creates anxiety for the students, necessitated an examination of expatriate-teacher turnover in the international school industry of China. This qualitative descriptive phenomenological study of expatriate-teacher turnover in the international school industry of China, was framed by the concepts of the internationalized schools in China and teacher turnover …

Understanding Calculus Through Maple-Based Dynamic Visualization Tools, Segla Kokou Kossivi

Walden Dissertations and Doctoral Studies

First-year college students experience difficulties in understanding the concepts of derivatives and integrals. At the postsecondary level, the use of static visualization and other traditional instruction delivery methods often are unable to meet students' needs in calculus. This problem is current and essential in the field of education and needs consideration to enhance the method of teaching calculus. The rationale for this study was to scrutinize the effects of Maple dynamic visualization instructional activities, within the framework of the animation-visualization theory, on students' conceptual and procedural understanding of differential and integral calculus. The usage of a quantitative 2x2 factorial pretest-posttest …

Exploring Destination Imagination Alumni Perceptions Of 21st-Century Skills And Workforce Readiness, Sharon Kovalevsky

Walden Dissertations and Doctoral Studies

Workplace requirements are vastly different from the past due to rapid changes in technology and globalization, and they require graduates to have well-developed 21st-century skills and innovation strategies. The problem addressed in this study was the lack of understanding of how 21st-century skills that alumni learned through academic extracurricular experiences informed their early career and workforce readiness. The purpose of this qualitative study was to explore how Destination Imagination (DI) alumni perceived that the 21st-century skills they learned as part of their academic extracurricular experiences informed their early career readiness. The study was grounded by the 3 constructs of work …

Perceptions Of Urban Secondary Science Teachers Regarding Social Learning Professional Development, Mary Kaye Macauley

Walden Dissertations and Doctoral Studies

Traditional classroom environments may not motivate students to learn and may lack interactive connections between educators and learners in the classroom. The problem addressed in this research study is the lack of understanding of science teachers' use and perception of innovative social learning strategies implemented in urban classrooms. The purpose of this research study was to establish urban science teachers' perceptions regarding social learning strategies within their classrooms. The conceptual framework of Hall and Hord's levels of use was used. The research questions addressed in this study focused on the perceptions and experiences of secondary science teachers in a large, …

Exploring Fathers' Perception Of Their Reading And Math Skills And Paternal Involvement, Vielka C. Massenburg

Walden Dissertations and Doctoral Studies

Many children in the U.S. public education system at the elementary and secondary levels are below proficiency in reading and math. Parental involvement within the home and school context is important to children's overall and academic success. The purpose of this basic, qualitative study was to explore fathers' perception about their self-efficacy, reading and math skills, knowledge of and accessibility to educational and community resources, and their involvement in the academic lives of their elementary school-age children. Bronfenbrenner's ecological systems theory provided the theoretical framework of social interrelatedness. Semistructured interviews were conducted to collect the data from 7 fathers with …

Middle School General Education Teachers' Instruction Of English Language Learners, Lakisha Mitchelle Nelson

Walden Dissertations and Doctoral Studies

In a southeastern state, Grade 7 and 8 middle school general education teachers were not implementing cultural and individual instructional strategies consistently to support the academic achievement of the growing population of English language learners (ELLs). The purpose and key research questions of this qualitative study were designed to (a) identify what cultural relevant instructional strategies Grades 7 and 8 middle school general education teachers implement, (b) identify what individual relevant instructional strategies, and (c) understand what perceptions teachers have regarding strategies to facilitate consistent implementation of cultural and individual instruction to support ELLs. The conceptual frameworks guiding this study …

Reported Literacy Engagement Among Low-Income Parents And Their Children., Olugemi Ojo

Walden Dissertations and Doctoral Studies

Little is known about literacy engagement between low-income parents and their preschool children, although it may affect children's language development and later school achievement. The purpose of this qualitative study was to examine shared reading interactions among low-income parents and their children. The research questions addressed the lexical diversity of books read and the shared book reading experience of preschool children as reported by their low-income parents. The conceptual framework was based on the work of Hart and Risley, who proposed that the extent and value of literacy environment and collaboration during shared book reading are linked to the socioeconomic …

Social Responsibility Perceptions Of Community Flood Resilience In Nigeria, Reginald Olisa Oranye

Walden Dissertations and Doctoral Studies

Flooding is a severe threat to livelihoods and socioeconomic development in Ogbaru riverine communities of Anambra State, Nigeria. Limited success in the traditional approach of using predominantly structural measures, such as flood channels, to manage floods makes it imperative to explore nonstructural resilience initiatives that would potentially better protect vulnerable flood-prone communities. This study contributes to addressing the problems of ineffective flood management by developing vital social responsibility (SR) data and information that can enhance community flood resilience through individual and collective responsibilities for resilient action. The purpose of this quantitative correlational study was to explore SR perceptions of flood …

Career And Technical Education Teachers Integrating Literacy And The Support Administrators Provide, Heather Denese Piccott-Bryan

Walden Dissertations and Doctoral Studies

Education regulations in many U. S. schools require teachers, including career and technical education (CTE) teachers, to integrate literacy skills into the curriculum to support student performance on standardized tests. Changes in teaching strategies and content for literacy integration require administrators to improve the support systems for CTE teachers. The purpose of this basic qualitative study was to explore CTE teachers' experiences in integrating literacy into the curriculum and the support they receive from administrators. Fullan's change model informed the conceptual framework for this study. Individual interviews with 4 teachers and 3 administrators from a state on the east coast …

Effects Of Blended Learning Using The Rotation Model On Fourth And Fifth Grade Students' Mathematics Scores, Heather Roach

Walden Dissertations and Doctoral Studies

The problem addressed in this quantitative study was that school administrators are allocating funds for implementing blended learning using the rotation model into mathematics classrooms without knowing if it is effective in improving student achievement in mathematics. The purpose of this study was to determine the effect of blended learning using the rotation model on fourth and fifth grade students' achievement in mathematics. Mayer's cognitive theory of multimedia learning guided this study. In this quantitative quasi-experimental comparative study, data from N = 591 fourth and fifth grade students and N = 3 principals from three selected central Indiana elementary schools …

Instructional Leadership Of Elementary School Principals Regarding Proficiency In Mathematics, Melvinia Robinson

Walden Dissertations and Doctoral Studies

Elementary school principals, as instructional leaders, are critical to improving

mathematics proficiency. The research problem was that elementary school principals are

inconsistently applying instructional leadership to support mathematics teachers' efforts

to improve students' proficiency. The purpose of this qualitative case study was to

understand how elementary school principals apply instructional leadership to support

mathematics teachers in their efforts to improve student proficiency in mathematics. The

conceptual framework was the instructional leadership model of Hallinger and Murphy,

which defines three main dimensions of instructional leadership: (a) the school mission,

(b) the instructional program, and (c) the school climate. The research question …

Instructional Leadership Practices Of Middle School Principals Regarding Specialized Training In Mathematics, Sherry Ann Schock

Walden Dissertations and Doctoral Studies

The research problem addressed in this study centered on middle school principals who were inconsistently implementing instructional leadership practices to support teachers teaching mathematics even though they received middle-grades leadership development (MLD) training. The purpose of this basic qualitative research was to understand why middle school principals, trained in MLD, were inconsistently implementing instructional leadership practices to support teachers teaching mathematics. The research question asked how middle school principals, trained in MLD, implement instructional leadership practices to support teachers teaching mathematics to improve student academic outcomes. The conceptual framework was Vygotsky's learning and development theory used within MLD training to …

Lecture Versus Collaborative Learning Methods In Community College Classrooms, Gwendolyn A. Vaughn

Walden Dissertations and Doctoral Studies

Abstract

Educational scholars have recommended using collaborative learning in higher education classrooms to improve the learning outcomes of community college students. The problem is that many community college instructors continue to use traditional lecture methods, which might be due to instructors not being convinced of the merits of collaborative learning. The purpose of this quasi-experimental, causal-comparative, repeated measures, research study was to examine the difference between pre- and posttest change scores on the Personal Community Health assessment of students who were taught with the collaborative method and students who were taught with the lecture method. The theoretical foundation for this …

Nigerian Early Childhood Educators' Perspectives On The Influence Of Divorce On Children's Academic Achievement, Monica Ufuoma Peremine Wosowei

Walden Dissertations and Doctoral Studies

Parental divorce has profound negative effects on children's performance in school. The purpose of this basic qualitative study was to explore Nigerian early childhood educators' perspectives on the effects of divorce on children's academic achievement and strategies or suggestions for working with these children. The conceptual framework of this study consisted of three theories: Bowen's family systems theory, Piaget's theory of cognitive development, and Vygotsky's theory of social constructivism. Two research questions focused on educators' perspectives on the effects of divorce on children's academic achievement. Data were collected from 12 educators who are the participants using the inclusion criteria and …