identifier: Anwar, Shams <https://research.library.mun.ca/view/creator_az/Anwar=3AShams=3A=3A.html>   (2020) Electrochemical and corrosion behavior of electrodeposited Zn, Zn-Ni alloy and Zn-Ni-TiO₂.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Corrosion is one of the main causes of structural deterioration in process industries. It often causes process equipment failure and ruptures, which lead to severe safety problems, such as environmental pollution or even fatalities. To address this problem, one approach is to provide a preventive barrier-coating. This thesis investigates the electrochemical and corrosion behavior of the electrodeposited zinc, zinc-nickel alloys, and zinc-nickel-oxide composites. The negative reduction potential of Zn/Zn²⁺ electrode offer significant challenge to be electroplated. It also has high propensity liberate hydrogen gas. The complexation of zinc and nickel ions by complexing agent (ammonium citrate, potassium citrate and ethylene-diamine-tetra-acetic acid (EDTA)) stabilized the bath, which can extend the pH of nickel hydroxide and zinc oxide for electroplating purposes. The systematic design of the Zn-Ni alloy electroplating has been conducted using a five-variable experimental plan comprised of four steps: (1) a two-level fractional factorial design (FFD), (2) a response surface design the steepest ascent analysis, (3) a central composite design (CCD), and (4) corrosion behaviour test to optimize the factors in Zn-Ni deposition. After design of experiment, the optimum conditions were found to be a Zn/Ni molar concentration ratio 0.66, a plating temperature of 28ᴼC, an electroplating current density of 60mA/cm², an electroplating time of 13 minutes, and a citrate concentration of 0.062 mol/l. From the corrosion behaviour test of step-4 was found that the films with higher intensity of γ-NiZn₃, γ-Ni₂Zn₁₁, and γ-Ni3Zn₂₂ phases exhibited better corrosion resistance. The pure Zn, Zn-Ni alloy and Zn-Ni-nanoTiO₂ composite electroplated samples were deposited from citrate and non-citrate bath under the various level of deposition conditions from baths containing potassium and ammonium citrate were studied. Zn-Ni deposit obtained at 60mA/cm² from citrate bath exhibited lower corrosion current (Icorr), and less negative corrosion potential (Ecorr) compared to pure Zn and Zn-Ni alloy coatings from the non-citrate bath. Crystallite size of Zn-Ni coating deposited from citrate bath is 35.40 nm, and Ni content of the coating is 8.3 wt%. Zn-Ni films with smaller grain size with uniform coating had increased impedance modulus and improved corrosion resistance. The electrochemical behavior of samples shown that Zn-Ni alloy with the incorporation of 0.003 mol/l of Titania (TiO2) nanoparticles exhibited noble Ecorr and less Icorr values led to increasing impedance modulus with a less coarse, compact and stronger uniform coating of 25.84 nm grain size. The chemical composition result showed that the Zn-Ni-0.003 mol/l of TiO₂ coating electrodeposited from citrate bath at various immersion tests reduced dezincification in the coating. The most significant anticorrosion products for Zn-Ni alloy electroplating are simonkolleite, hydrozincite, zincite, and wulfingite.
Additionally, Zn-Ni alloy deposited from a chloride bath containing EDTA was also investigated in this study. Polarization tests demonstrated that the Zn-Ni alloy deposited from 0.119 mol/l of EDTA bath at 20mA/cm² current density exhibited lower Icorr and more positive Ecorr values. At 24 hours of immersion time, the samples exhibit higher corrosion resistance leads to the formation of stronger anticorrosion layers.
Finally, the pitting corrosion behavior of Zn-Ni alloy coatings in NaCl solutions with different chloride concentrations and pH were investigated. The pitting behavior in acidic solution with low chloride concentration was found to be significantly different from that in the neutral solution with high chloride concentration. Electrochemical analysis indicates that the corrosion behavior of the samples immersed at 0.35 mol/l of NaCl and pH = 3.0 have low impedance values in comparison to the samples immersed at 0.35 mol/l of NaCl and pH = 7.0 samples. Exclusive large pit morphology due to corrosion in acidic (pH 3.0) and low chloride concentration (0.35 mol/l) was observed.
The comprehensive experimental study developed the processes for enhancing the corrosion resistant and mechanical properties of the Zn, Zn-Ni alloy and Zn-Ni-TiO2 composite coatings and investigate the stability of the electroplating baths.


identifier: Lau, Nelson <https://research.library.mun.ca/view/creator_az/Lau=3ANelson=3A=3A.html>   (2020) Effects of traffic related air pollution exposure on childhood asthma onset during the different developmental stages of childhood.  Masters thesis, Memorial University of Newfoundland.

type: Thesis NonPeerReviewed

abstract: Childhood asthma is a chronic condition which affects millions of children worldwide. It is associated with many risk factors, including traffic related air pollution (TRAP). While the relationship between TRAP and childhood asthma is well established, the relationship between TRAP and different childhood asthma patterns, or phenotypes is less well studied. This thesis consists of a systematic review and an analysis of a longitudinal cohort study addressing this knowledge gap. The results from our systematic review suggest that TRAP is associated most strongly in early childhood asthma phenotypes, which is supported by the results of our longitudinal cohort study (Quartile 3 OR: 2.11, 95% CI: 1.29, 3.44, Quartile 4 OR: 2.16, 95% CI: 1.27, 3.68 compared to Quartile 1 of NO₂ exposure for early childhood onset asthma phenotype). Our results suggest that younger children are more susceptible to TRAP compared to older children and emphasize the importance of considering asthma phenotypes in future research.


identifier: Meneses Hernandez, Ysabel Leonor <https://research.library.mun.ca/view/creator_az/Meneses_Hernandez=3AYsabel_Leonor=3A=3A.html>   (2020) Regulation of interferon regulatory factor 1[IRF1] antiviral functions by its ubiquitination.  Masters thesis, Memorial University of Newfoundland.

abstract: Interferon regulatory factor 1 (IRF1) is a transcriptional factor that regulates the expression of antiviral genes. IRF1 expression is downregulated in cancer cells, which supports efficient replication of oncolytic viruses. Posttranslational modifications are one of the major cellular mechanisms that regulate IRF1 expression and functions. To understand roles of IRF1 ubiquitination on innate antiviral immunity, we determined the antiviral activity of IRF1 ubiquitin resistant mutants. IRF1 ubiquitin resistant mutants (78K, 275K, and 299K) were generated and transfected into DLD-1, DU145 or MDA-MB-468 cells. The cells were then challenged with vesicular stomatitis virus (VSV) at MOI 1. Virus infection was evaluated by Western blotting against vesicular stomatitis virus glycoprotein (VSV-G), and progeny virus production. The 275K or 299K mutants showed higher antiviral activity when compared to wild type IRF1. Conversely, cells transfected with the 78K mutant were more susceptible to VSV infection than those transfected with wild type IRF1. In conclusion, 78K, 275K, and 299K sites are IRF1 ubiquitination sites which regulate IRF1 antiviral functions.


identifier: Shoghi, Rahim <https://research.library.mun.ca/view/creator_az/Shoghi=3ARahim=3A=3A.html>   (2020) Modelling of trench effect on fatigue performance of steel catenary riser.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The riser-seabed interaction resulting in a trench formed in the touchdown zone (TDZ) of steel catenary risers (SCR) has a significant influence on accumulated fatigue damage. Several studies have used different trench modeling approaches to investigate the trench effect on fatigue performance of SCR. However, contradictory observations have been reported with no coherent agreement on the beneficial or detrimental effect of the trench on fatigue. In this study, the significance of trench geometry in fatigue damage evaluation was investigated. Using boundary-layer methods (BLM) and numerical approaches, a meaningful relationship was observed between the trench geometry in different zones and the peak fatigue damage. A new set of rules was proposed for the qualitative assessment of the overall trend of the trench effect on the variation of fatigue damage. The proposed assessment rules were validated by performing comprehensive numerical fatigue analysis. A comparison with samples of published experimental and numerical studies was also conducted. The developed geometrical model and the set of rules for qualitative assessment of the trench effect on fatigue were used to re-assess the majority of the key published studies. The proposed methodology resulted in a more coherent agreement between the published studies. It was observed that for the near, far, or out of the plane direction of the vessel excursions, the ultimate fatigue damage might be slightly increased or decreased depending on the probability of occurrence in different geographical locations. Instead, the trench effect appeared in the form of significant shifting of the peak damage point towards the opposite direction of the low-frequency vessel excursions. This implied that the case dependency of the trench effect on fatigue response in different geographical locations with various environmental loads was a potential source for the contradictory results reported in previously published studies. Moreover, the study revealed the significance of riser flexural rigidity and its relation with TDP oscillation on the trench surface and the fatigue damage accumulation, consequently. The peak fatigue damage depending on the trench profile was analytically obtained and showed a good agreement with numerical models. The effect of seabed soil stiffness on the fatigue performance of SCR was compared with the contribution of the trench profile in the touchdown zone. The conducted research revealed several significant trench effect on the fatigue performance of SCR and provided an in-depth insight into this challenging problem.


identifier: Pramanik, Titli <https://research.library.mun.ca/view/creator_az/Pramanik=3ATitli=3A=3A.html>   (2021) An experimental investigation of ice-concrete adhesion and corresponding abrasion.  Masters thesis, Memorial University of Newfoundland.

abstract: Concrete wear due to ice collision is a threat that marine structures in colder regions deal with. This phenomenon can cause damage to the structures, resulting in high maintenance costs. One damage mechanism may arise from ice sticking to the concrete under pressure and then damaging the concrete when the bond is broken by ice movement. The objective of this study is to experimentally measure adhesion strength between ice and concrete with various applied pressure and contact duration time under constant temperature for both dry and submerged conditions. A secondary objective is to measure the corresponding concrete abrasion arising from the ice bond breaking process. This thesis reviews previous laboratory work to identify the critical issues, including different areas with similar approaches. Significant parameters, contributing factors, and relevant design of test setups were reviewed from previous studies. Based on these factors, the rationale of the current study was developed, and the experiment was designed accordingly. A pilot experiment was designed to explore design factors for the main experiment. Considering these findings, a new apparatus was designed and the test setup was modified to conduct the experiment. The experiment was designed in a 7x7 square matrix format. The tests were conducted and a nonlinear relationship was obtained from the data set. Photographs were taken, and sample weights were measured before and after the tests to obtain the material loss for both ice and concrete samples. Statistical analysis was conducted with the collected data to obtain the impact of the independent variables on the test result. The observed trends were found to be statistically significant.


identifier: Keough, Erin Leah Rose <https://research.library.mun.ca/view/creator_az/Keough=3AErin_Leah_Rose=3A=3A.html>   (2020) The experiences of therapeutic recreation student interns.  Masters thesis, Memorial University of Newfoundland.

abstract: Internships are used as an educational tool to allow students to learn and understand the daily practices of a profession they are studying in university. To become a Certified Recreation Therapist Specialist (CTRS), students must complete an internship in a clinical setting under the supervision of a CTRS. The majority of studies that have examined internship outcomes have focused on the perspectives of professionals and educators. This qualitative study investigated the therapeutic recreation (TR) internship from the perspective of students. Participants of this study were seven graduates from Memorial University of Newfoundland (MUN) Bachelor of Recreation program who had completed their TR internships. Through semi-structured interviews, the main themes identified included; growth as a professional, meaningful relationships, and perceptions of learning. The results of this study suggest the need for further examination of higher education in therapeutic recreation.


identifier: Hurley, Emily Priscilla <https://research.library.mun.ca/view/creator_az/Hurley=3AEmily_Priscilla=3A=3A.html>   (2020) Interactions among models of amyotrophic lateral sclerosis and Parkinson disease in Drosophila melanogaster.  Masters thesis, Memorial University of Newfoundland.

abstract:
Amyotrophic Lateral Sclerosis (ALS) is a neurodegenerative disease characterized
by the progressive loss of upper and lower motor neurons. In contrast, Parkinson Disease
(PD) is a neurodegenerative disease characterized by the loss of dopaminergic neurons
within the substantia nigra region of the brain. Recently, a number of genes have been
identified to be involved in the progression of these diseases, this study focuses upon four
ALS-related genes: TARDBP(TBPH), p62/SQSTM1(Ref(2)P), TBK1(IK2), and
VCP(TER94). These genes have been linked to the autophagy pathway and its sub-type,
mitophagy, which have been suggested to play substantial roles in the progression of ALS
and PD. Employing the Drosophila model organism, I have investigated the consequences
of the altered expression of these ALS-related genes in combination with modified PD
gene activities in an attempt to discover potential interactions and similarities between the
biological basis of neurodegenerative diseases and aging. Notable observations show that
the inhibition of TBPH in the motor neurons leads to a reduction in longevity and
locomotor ability, and, in complementary experiments, inhibition of TBPH in the
developing neuron-rich Drosophila eye reduces the ommatidia and interommatidial bristle
counts. The overexpression of IK2 in the motor neurons reduces longevity and locomotor
ability. The inhibition of Ref(2)P in the motor neurons, as well as in the dopaminergic
neurons, increases median lifespan, slightly, while severely reducing locomotor ability,
which may suggest a compensational relationship between longevity and motor function.
The inhibition of Ref(2)P and parkin in the ddc-Gal4-expressing neurons provided an
increase in lifespan, while resulting in a reduction in locomotor ability. Investigation of the inhibition of TER94 provided variable results, however I have shown that inhibition of
TER94 in the dopaminergic neurons can reduce longevity and locomotor ability over
time. The co-inhibition of TER94 and parkin has shown a marked reduction in lifespan
(by ~30%) and a reduction in locomotor ability. In contrast, the inhibition of TER94 in
combination with the expression of alpha-synuclein has shown an large increase in
lifespan (by ~28%), with an accompanying reduction in locomotor ability over time.
Investigation of these candidate genes and their role in a model of human disease
progression has provided some clues to our understanding of ALS and PD.


identifier: Kedir, Amana Jemal <https://research.library.mun.ca/view/creator_az/Kedir=3AAmana_Jemal=3A=3A.html>   (2020) Phosphorus dynamics in boreal podzols converted from forest to agriculture.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Phosphorus (P) is a non-renewable and vital element for all life and the second most yield-limiting nutrient next to nitrogen in agriculture. The global and regional soil P pools, fluxes and the governing biogeochemistry vary with soil, vegetation, and management types. Limited understanding of the dynamics of P fluxes and pools in the Newfoundland (Nfld) natural and agricultural Podzols hampers decisions on best management options. To fill this knowledge gap, I: (a) assessed the levels and status of P in Nfld farm soils and their relationship with the recommended fertilizer rates across locations and managements; (b) evaluated the utility of ten P-extraction and analysis tests (P-test) for P extractability in natural grassland, as well as forested and agricultural soils; (c) determined P adsorption isotherms for forested and agricultural soil horizons; (d) investigated the P adsorption capacity of long-term managed soils; and (e) carried out a greenhouse trial to evaluate the plant uptake of P from soil layers relevant to soils converted from forested to agricultural use.
The provincial Mehlich-3 P-test confirmed the relationship between measured P and the recommended P rates, but also suggests possible overfertilization. Soil P-test measurements varied with management status and were affected by the soil organic matter (SOM), Al, Fe, and soil depth or horizon. Citric acid extracted significantly more P for all tested soil conditions except for newly converted soils. Phosphorus adsorption capacity varied by soil horizon, depth, and management.
Phosphorus availability and uptake in recently converted soils from forested to agriculture varied with soil depth and P sources. Given the variability in results and the possibility for a mismatch between P application and P uptake for soils, differentially across a range of conversion ages and managements, it is critical that further agronomic work focuses on the detailed understanding of P species and the effect of management on the P biogeochemistry, with a focus on the role of SOM and mineral contents. It is recommended that targeted calibration of P-test and recommendations be carried out to cover all sources of variability in soils that have undergone conversion to confirm the relationship between P sources, extractability, and uptake for different conversion and management states.


identifier: Aslkhalili, Amin <https://research.library.mun.ca/view/creator_az/Aslkhalili=3AAmin=3A=3A.html>   (2020) Reliability assessment of drag embedment anchors and laterally loaded buried pipelines.  Masters thesis, Memorial University of Newfoundland.

abstract:
Drag embedment anchors and buried subsea pipelines are two important elements of the offshore field developments that are used for station-keeping of floating facilities and transferring the hydrocarbons, respectively. The lateral soil resistance against the drag anchors and pipelines are mobilized in a similar fashion with identical conventional design equations. This is fundamentally caused by similar lateral projection of the anchor and pipe geometries. The reliability assessment of the drag embedment anchors as a key component of mooring systems, and the lateral response of trenched pipelines as crucial structural elements are significantly important due to a range of uncertainties involved in the design process. Despite the similar design equations for lateral soil resistance against the moving anchor and pipe, these elements are subjected to different kinds of loadings and uncertainties that are expected to affect their reliability indices. In this study, the reliability of drag embedment anchors and laterally displaced pipelines were conducted and compared to investigate the extent of similar fashions in the lateral response of these two elements to large displacements. Both uniform and non-homogeneous soil domains were considered and compared to evaluate the impact of more realistic design scenarios. Macro spreadsheets were developed for iterative limit state and kinematic analyses and obtaining the holding capacity of drag embedment anchors. The lateral force-displacement responses of the buried pipelines were extracted from published centrifuge model tests and incorporated into finite element models in ABAQUS. Automation Python scripts were developed to perform a comprehensive series of numerical analyses and post-process the outputs to construct the required databases. Response surfaces were developed and probabilistic analyses were conducted by using the first order reliability method (FORM) to obtain the reliability indices and failure probabilities.
Comparative studies were conducted to obtain an equivalent annual probability of failure between the pipelines and drag anchors. The study showed that the similar conventional approaches for modeling of the anchors and pipelines lateral displacement might be acceptable for homogeneous soil domains. However, the reliability indices were significantly affected by defining non-homogenous soil domains. It was observed that the magnitude of the reliability indices in the layered soil strata and trenched/backfilled conditions could be significantly reduced. This, in turn, revealed the need for improving the current design codes to incorporate more realistic conditions. The proposed probabilistic approach was found robust to optimize the subsea configuration of the anchors and pipelines and improve the reliability indices. The study revealed several important trends in anchors and pipeline-seabed interactions and provided an in-depth insight into its impact on reliability assessment and a safe and cost-effective design.


identifier: Zaheer, Ayat <https://research.library.mun.ca/view/creator_az/Zaheer=3AAyat=3A=3A.html>   (2020) Women, labor and television: a critical analysis of women portrayed in Pakistani drama serials.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this research is to look critically at the way women are represented in mainstream entertainment media on Pakistani television channels, mainly in televised drama serials. My chief research question is: How is women’s labor represented in select Pakistani televised drama serials? One reason women’s work is not always apparent is because of the gendered nature of work, and especially care work, where it is assumed that women will look after the household chores, especially in patriarchal societies. I propose that these shows (1) naturalize a certain form or notion of femininity as the only suitable one for Pakistan’s women, and (2) naturalize a theory of work that both denies the actual work that women do and that discourages women from stepping into the masculinist marketplace of public careers. I use feminist media representation theory. Because media has the power to disseminate patriarchal and ideological views, it has always been at the centre of feminist criticism. Feminist audiovisual content analysis enables me to critically highlight the biases towards women employed in different occupations, as well as if and how the social reproductive labor of the women who are portrayed as mothers, sisters, daughters, wives, and grandmothers on screen is ignored or taken for granted.


identifier: Mierach, Svea Nora <https://research.library.mun.ca/view/creator_az/Mierach=3ASvea_Nora=3A=3A.html>   (2020) Hochschild cohomology, modular tensor categories and mapping class groups.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
It is known that the mapping class group of a compact oriented surface of genus g
and n boundary components acts projectively on certain Hom-spaces, called spaces
of chiral conformal blocks, arising from a modular tensor category. If the tensor
category is nonsemisimple, the Hom-functor is not exact and one can ask if there
is a similar construction that gives a projective action of the mapping class group
on the right derived functors. We will approach this question in two steps:
In the first step, which is carried out in Chapter 2, we consider the case where
the modular tensor category is given by the category of finite-dimensional modules
over a factorizable ribbon Hopf algebra, and take the torus as the surface. In this
case, the mapping class group is the modular group SL(2, Z), and one of the Hom-spaces
mentioned above is the center of the factorizable ribbon Hopf algebra. The
center is the zeroth Hochschild cohomology group, and we show that it is indeed
possible to extend this projective action of the modular group to an arbitrary
Hochschild cohomology group of a factorizable ribbon Hopf algebra.
The second step, which is carried out in Chapter 3, is to consider the general case.
We construct from an arbitrary modular tensor category and for every compact
oriented surface with finitely many labeled boundary components a cochain complex
of finite-dimensional vector spaces. Its zeroth cohomology group is the vector
space appearing in the original construction. We show that the mapping class
group of the surface acts projectively on the cohomology groups of this cochain
complex in such a way that it reduces to the original action in degree zero. As we
explain, this generalizes the results in Chapter 2.


identifier: Mahapatra, Monalisa <https://research.library.mun.ca/view/creator_az/Mahapatra=3AMonalisa=3A=3A.html>   (2020) Technostress and disengagement from knowledge sharing: an empirical analysis.  Masters thesis, Memorial University of Newfoundland.

abstract:
Knowledge sharing is important for organizations to generate new and innovative ideas and to
sustain competitive advantage in the volatile business environment. However, there exist various
counterproductive knowledge behaviors and, in this study, I focus on one such behaviors known
as “disengagement from knowledge sharing”. Using the Job Demands-Resources framework, I
intended to understand whether information and communication technologies (ICTs) related
phenomena in workplace setting such as technostress creators and technostress inhibitors
influence employees’ disengagement from knowledge sharing. Using online survey
methodology, I collected data from full time employees, who regularly use ICTs for their
professional tasks. The analysis was conducted with the partial least squares path modeling
method in SmartPLS software. The results show technostress creators influence disengagement
from knowledge sharing and this relationship is mediated by burnout. Finally, I also discussed
the implications, limitations, and future research directions of the study.


identifier: Kawsar Zaman, Shafi Md <https://research.library.mun.ca/view/creator_az/Kawsar_Zaman=3AShafi_Md=3A=3A.html>   (2020) Signal processing and graph-based semi-supervised learning-based fault diagnosis for direct online induction motors.  Masters thesis, Memorial University of Newfoundland.

abstract: In this thesis, fault diagnosis approaches for direct online induction motors are proposed using signal processing and graph-based semi-supervised learning (GSSL). These approaches are developed using experimental data obtained in the lab for two identical 0.25 HP three-phase squirrel-cage induction motors. Various electrical and mechanical single- and multi-faults are applied to each motor during experiments. Three-phase stator currents and three-dimensional vibration signals are recorded simultaneously in each experiment. In this thesis, Power Spectral Density (PSD)-based stator current amplitude spectrum analysis and one-dimensional Complex Continuous Wavelet Transform (CWT)-based stator current time-scale spectrum analysis are employed to detect broken rotor bar (BRB) faults. An effective single- and multi-fault diagnosis approach is developed using GSSL, where discrete wavelet transform (DWT) is applied to extract features from experimental stator current and vibration data. Three GSSL algorithms (Local and global consistency (LGC), Gaussian field and harmonic functions (GFHF), and greedy-gradient max-cut (GGMC)) are adopted and compared in this study. To enable machine learning for untested motor operating conditions, mathematical equations to calculate features for untested conditions are developed using curve fitting and features obtained from experimental data of tested conditions.


identifier: Hall, Kyle <https://research.library.mun.ca/view/creator_az/Hall=3AKyle=3A=3A.html>   (2020) A general model of MnSi-like helical magnets.  Masters thesis, Memorial University of Newfoundland.

abstract:
MnSi and other magnets belonging to the B20 designation are known to assume exotic
magnetic structures with subtle features. Of these, the most notable is the appearance
of long-wavelength helical structures. Previous analyses of these materials considered
oft-used and non-specific models to describe these systems. I will present a general,
classical model with only nearest neighbour exchange interactions constructed
through symmetry considerations. This model is complete up to the determination
of the relative strengths of the coupling constants and the inclusion of other interactions.
Comparison to other models will reveal a general relationship between this
model and those used in previous analyses. Further comparison with experimentally
observed features is used to produce magnetic order parameters of the structure and
a relationship between their complex values and structure observables.
Also presented are the results of computational simulations using the Effective
Field Method. These simulations are conducted with specific anisotropic and Zeeman
interactions introduced to the model. Periodic boundary conditions are not used to
maintain the incommensurate helical structure. The results of these simulations are
analyzed to extract several lattice structure parameters and the action of individual
exchange constants is considered. Additionally, the relation between this model and
others is discussed and the introduction of isolated skyrmions is observed. Finally,
the results of preliminary simulations with applied magnetic fields oriented along the
helix wavevector are presented. These final results demonstrate the appearance of a
conical phase and illuminate the effect of specific anisotropic terms. The critical field
Bc₂, i.e., the critical field between the conical and field-induced ferromagnetic states,
and the relationship between canting and field strength are also reported.


identifier: Nelder, Matthew <https://research.library.mun.ca/view/creator_az/Nelder=3AMatthew=3A=3A.html>   (2020) The role of an addictive tendency towards food and patterns of body fat distribution in obesity and metabolic health.  Masters thesis, Memorial University of Newfoundland.

abstract:
Food addiction (FA) is a contributing factor to obesity. Individuals with similar total body fat (BF) %, exhibit a large amount of heterogeneity in how BF is distributed. Certain BF distribution (BFD) patterns produce different outcomes regarding metabolic health. Little is known about how FA influences BFD and metabolic profiles.
The study was designed to evaluate the correlation between FA symptom counts and metabolic characteristics, the correlation between FA symptoms and BFD patterns with emphasis on central obesity and Visceral fat (VF), and the role of android fat (AF) in women’s metabolic health. Data from the CODING study was used for analysis.
FA symptoms are correlated with HOMA-β, triglycerides (TG), inversely correlated with high-density lipoprotein (HDL) in men and are correlated with TG in post-menopausal women. FA symptom counts were also associated with central obesity markers in men and women, including trunk fat (TF) and VF. Women exhibited slightly stronger correlations for all BFD measures except for VF and AF than in men. AF to GF ratio (AGR) affected metabolic characteristics and metabolic syndrome (MetS) risk in women. When separated into AGR tertiles, women in each tertile differed significantly in levels of insulin, glucose, TG, HDL, low-density lipoprotein (LDL), total cholesterol (TC), blood pressure (BP), and waist circumference (WC). Women in the top tertile exhibited higher levels of HOMA-IR and HOMA-β. When women in the top AGR quartile, matched by age and body mass index (BMI) with a control group while controlling for VF, were 2.4x more likely to have MetS.
In conclusion, FA symptoms exhibit correlations with markers of metabolic disturbance in men and to a smaller degree in women. FA symptoms are also correlated with central obesity in men and women. Women with high levels of AF are at increased risk of developing MetS when compared to women of similar age and BMI.


identifier: Rashid, Farhan <https://research.library.mun.ca/view/creator_az/Rashid=3AFarhan=3A=3A.html>   (2020) Hyperbolically embedded subgroups in terms of Fine graphs.  Masters thesis, Memorial University of Newfoundland.

abstract:
Since the 1980s, mathematicians have been studying hyperbolic groups, and hyperbolic
geometry has been considered one of the most useful tools in geometric group
theory. In the 2000s, a generalization of hyperbolic groups was introduced by Dahmani,
Guiraldel and Osin, known as hyperbolically embedded subgroups. This notion
has several applications in group theory and low dimensional topology. In this thesis,
we introduce an alternative definition of hyperbolic embedded subgroup modelled on
a characterization of a relatively hyperbolic group by Bowditch [2] and prove that
our notion is equivalent to the original definition.


identifier: Igbokwe, Loveday Chidozie <https://research.library.mun.ca/view/creator_az/Igbokwe=3ALoveday_Chidozie=3A=3A.html>   (2020) Severe slugging with multiphase fluid transport and phase separation in subsea pipelines.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Flow assurance and separation of multiphase oil and gas flows are becoming more
challenging as offshore development advances into more difficult environments. Petroleum
fluids are required to be transported to processing facilities over long distances and through
difficult terrain, as well as under varying temperatures and pressures. Severe slugging is a
well-known flow assurance problem that limits effective offshore petroleum production.
Gas-lifting and topside choking have been used for decades to mitigate this flow problem
in fluid transport and processing. However, the application of these techniques has been
challenged by design, cost, and footprint constraints. The introduced complexities require
detailed understanding of the detailed dynamics of fluid flow in highly compact designs.
Systematic experimental and modeling investigations of severe slugging in pipeline-riser
systems can provide useful information on these slugging mechanisms and characteristics.
Experimental studies are conducted in this thesis to determine the mechanisms and key
parameters involved in the slugging performance in fluid processing installations. Through
well designed experimental tests, the impacts of actuators on slugging are examined. This
thesis also focuses on control systems to suppress slugging in the pipeline-riser system
using experimental analysis and control models. The research also presents new models
that predict phenomena of slugging behaviour, and more importantly, fitting for control
designs in offshore flow separation.
Furthermore, this thesis identifies and quantifies the process variables and conditions
associated with both slugging and non-slugging regions, leading to the development of
more effective solution methods and correlations. Relevant correlations (including slugging frequency, production rates, gas injection rate, compression requirements, and
operating pressures) are developed by dimensional analysis techniques. The study develops
new models, data and useful information for better understanding of slugging in pipeline
systems. Sensitivity analyses to assist in the selection and design of more accurate control
methods are also presented. The research outcomes provide improved and more robust
models and guidelines for implementing slugging mitigation measures.


identifier: Tran, Ha Thi Thu <https://research.library.mun.ca/view/creator_az/Tran=3AHa_Thi_Thu=3A=3A.html>   (2020) The impact of next-generation sequencing on diagnosis and management of children with epilepsy: from molecular testing to cost-effectiveness analysis.  Masters thesis, Memorial University of Newfoundland.

abstract:
Genetic testing is essential for diagnosis and treatment selection for children with epilepsy. Conventional approaches to genetic testing such as chromosomal microarray (CMA), and single-gene sequencing are time-consuming and expensive. Meanwhile, next-generation sequencing (NGS) allows simultaneous examination of all or most genes, which permits comprehensive and timely diagnosis of genetic etiology. Although NGS methods such as epilepsy panel (EP), whole-exome sequencing (WES), and whole-genome sequencing (WGS) are increasingly used, there is limited evidence about their diagnostic yield, clinical utility, and the cost-effectiveness of NGS-incorporated diagnostic strategies. The goal of this thesis, therefore, is two-fold: first, to conduct a systematic review and a meta-analysis of diagnostic yield and clinical utility of EP, WES, and WGS in comparison with CMA in pediatric epilepsy and second, to evaluate the cost-effectiveness of different NGS-incorporated diagnostic strategies from the health care system’s perspective.
A systematic review of PUBMED and EMBASE database identified 56 studies investigating diagnostic yields of EP, WES, WGS, and CMA (Chapter 2). Our random-effects meta-analysis of these 56 studies revealed that diagnostic yield was highest for WGS (0.66; 95% CI 0.00-1.00, two studies, 211 children, I² =99%), followed by WES (0.37; 95% CI 0.30-0.44, eighteen studies, 1322 children, I² =86%), and EP (0.25; 95% CI 0.22-0.28, thirty five studies, 14,265 children, I² =86%). CMA provided the lowest diagnostic yield (0.10; 95% CI 0.07-0.13, seventeen studies, 2,306 children, I² =85%). Clinical utility regarding to clinical management of WES (0.15, 95% CI 0.09-0.22, p=0.15, two studies of 289 children) was higher than that of EP (0.10, 95% CI 0.07-0.13, p<0.01, eleven studies of 11,044 children). Given their high diagnostic yield and clinical utility, NGS should be adopted in routine genetic investigation of pediatric epilepsy.
A decision-analytic model was developed to evaluate the cost-effectiveness of EP and WES in diagnosis and clinical management of epilepsy (Chapter 3). All EP and WES-related strategies were more effective than conventional diagnostic strategy. Among all diagnostic strategies, “WES as second-tier test” was the most cost-effective (ICER of 26,070 CAD per QALY). I also found that although the “WES and CMA as first-tier tests” strategy generated the highest QALYs, it was not cost-effective relative to “WES as second-tier test” (ICER > 100,000 CAD per QALY). Given the high cost of WES, “WES and CMA as first-tier tests” could become a cost-effective strategy when cost of WES decreases or the proportion of patients with etiology identified by WES and CMA increases.


identifier: Buckley, Alvan <https://research.library.mun.ca/view/creator_az/Buckley=3AAlvan=3A=3A.html>   (2020) A propensity score matched analysis of long-term mortality outcomes in patients aged 50 to 70 years after isolated mechanical versus bioprosthetic aortic valve replacement in Newfoundland and Labrador.  Masters thesis, Memorial University of Newfoundland.

abstract:
OBJECTIVE: Compare long-term mortality of patients after mechanical versus
bioprosthetic aortic valve replacement in Newfoundland and Labrador
METHODS: Retrospective cohort analysis of patients aged 50 to 70 years who
underwent aortic valve replacement in Newfoundland and Labrador between 2006 and
2014. A logistic regression propensity score generated a subset of 52 matched patients.
The long-term outcome of survival was assessed.
RESULTS: Of 189 patients included, 135 (71%) received mechanical valves, while 54
(29%) received bioprosthetic valves. The mean age in the matched group was 63
(mechanical) and 64 years (bioprosthetic) (P = 0.64). Mean follow-up was 8.1 (maximum
13.8) years. Survival at 30 days, 1, 5, and 10 years was: 100%, 96%, 85%, and 81%
(mechanical) versus 100%, 96%, 89%, and 67% (bioprosthetic). The hazard ratio for
mortality between mechanical and bioprosthetic valves was 0.64 (95% CI 0.18-2.3, P =
0.491). Secondary outcomes revealed that the most common cause of death to be
cardiovascular in etiology (39%), followed by malignancies (27%).
CONCLUSIONS: We found no statistically significant difference in long-term survival
in patients aged 50 to 70 years after mechanical versus bioprosthetic aortic valve
replacement.


identifier: Hollett, Kayla <https://research.library.mun.ca/view/creator_az/Hollett=3AKayla=3A=3A.html>   (2020) An experimental examination of binge eating disorder stigma.  Masters thesis, Memorial University of Newfoundland.

abstract: Background: Individuals with Binge Eating Disorder (BED) report feeling blamed, shamed, and misunderstood, but existing research on the public stigmatization of BED is limited and lacking methodological rigor. At present, vignette studies designed to examine BED stigma have two critical limitations: (1) they lack the necessary control vignettes to accurately assess the nature and magnitude of BED stigma; and (2) characters in BED vignettes are nearly always described as having a larger body, introducing the potential confound of weight stigma. For these reasons, the true nature of public stigma associated with BED is unclear. The current vignette study was designed to examine public stigma associated with BED while controlling for the effect of the vignette character’s body size. Method: Participants (N = 421) were randomly assigned to read one of six vignettes describing a young woman with either BED or no BED, as well as either no mention of her weight, a recommended weight, or an obese weight. Participants then completed four questionnaires to examine stigma in terms of personality characteristics they ascribed to the character, their anticipated emotional reactions upon interacting with the character, their desired social distance from the character, and the extent to which they blame the character for her condition. Results: The character with BED was ascribed more negative personality characteristics and faced less positive emotional reactions than the character without BED, regardless of her weight status. However, participants’ desire for social distance from the character did not depend on whether or not she had BED. Additionally, an unexpected finding emerged where the character was blamed less when she had BED and obesity compared to when she had obesity alone. Conclusions: BED is a highly stigmatized eating disorder, and stigma may have help-seeking implications for targeted individuals. Clinical and public policy implications are discussed, along with recommendations for future research.


identifier: Elmasry, Ahmed <https://research.library.mun.ca/view/creator_az/Elmasry=3AAhmed=3A=3A.html>   (2020) Risk-based integrity management (RBIM) of oil & gas offshore fixed steel structure platform.  Masters thesis, Memorial University of Newfoundland.

abstract:
Oil and gas offshore facilities structures operating in harsh environments are associated with high risk and the likelihood of failures. Hence, frequent inspections are needed to enhance the integrity and reliability of these 'platforms' structures using a rigorous strategy.
The purpose of this research is to develop an integrity management strategy for an above and underwater offshore platform steel structure using risk-based integrity management assessment. This strategy is developed in four steps: step one identifies the elements of the platform structures suitable for risk-based integrity management; in step two, identifies anomalies and degradation mechanisms. The third step is hazard identification using qualitative risk analysis, by hazard and operability model, and quantitative risk analysis, by the fault tree model, to calculate the probability of failure then qualitative assessment assigns the consequences. Step four ranks the risk to prioritize inspection and maintenance schedule and build an integrity management strategy.
As an outcome of this thesis, we are able to identify and categorize the degradation and deterioration mechanisms for the fixed steel structure platforms and gain an understanding of platform structural risks and rank these according to severity. Consequently, increase and enhance the reliability and integrity of the platform using an appropriate integrity management strategy. The proposed risk-based integrity management analysis proved that the risk-based inspection and risk-based maintenance methods used in this work are effective in terms of time, efficiency and cost, through reducing the frequency of inspection from 12 months to 24 or 36 months in some cases.


identifier: Bowes, Sherri C. <https://research.library.mun.ca/view/creator_az/Bowes=3ASherri_C=2E=3A=3A.html>   (2020) Characterizing excitatory transmission in melanin-concentrating hormone neurons.  Masters thesis, Memorial University of Newfoundland.


identifier: Kirolous, Mariane <https://research.library.mun.ca/view/creator_az/Kirolous=3AMariane=3A=3A.html>   (2020) A survey study evaluating persistence factors among dental hygiene students.  Masters thesis, Memorial University of Newfoundland.

abstract: There has been an increased number of students pursuing post-secondary education in recent years, however there is a need for additional research on factors fostering academic success and persistence. Minimal research surrounding the notion of persistence has been conducted within private college settings in Canada. Persistence is described as a student attribute that enables continued participation in post-secondary studies with the intent of graduating. A cross-sectional survey study was conducted to examine attitudes towards persistence amongst current students and recent graduates at The Toronto College of Dental Hygiene and Auxiliaries (TCDHA), a private Dental Hygiene College. An online survey questionnaire, the Institutional Integration Scales (IIS), developed by Pascarella and Terenzini (1980) was adopted and administered to students and graduates based on Tinto’s (1975) model of Student Integration. One hundred and fifty-one (N=151) respondents completed the survey, representing a 42% response rate. The findings support the significance of social and academic integration factors, while highlighting the need for greater attention to initiatives that address multicultural sensitivity and diversity within TCDHA. The findings have implications for academic leaders, educators, and policy makers to enhance strategies that may promote and foster greater persistence amongst post-secondary students while promoting students’ retention and graduation rates.


identifier: Willoughby, Hannah V. <https://research.library.mun.ca/view/creator_az/Willoughby=3AHannah_V=2E=3A=3A.html>   (2020) The pupillometric production effect: measuring attentional engagement during a production task.  Masters thesis, Memorial University of Newfoundland.

abstract: Reading to be remembered material aloud improves memory at test compared to material read silently; a finding termed “the production effect”. Aloud words are theorised to be better remembered because they stand out and benefit from distinctive processing during which unique features of the words (i.e., visual, phonological, semantic) are attached to the encoding trace. Recent accounts challenge this notion suggesting that an attentional or effortful component contributes to the effect. The following applies pupillometry to measure cognitive effort during a production task; the pupils dilate when one is engaged in an effortful task (e.g., solving a difficult math problem) compared to a less effortful task (e.g., solving an easy math problem). Across two experiments, I separated components of the production task (e.g., presenting the stimulus separately from speaking) to provide insight into the underlying active cognitive processes. In Experiment 1, a pre-cue was implemented, participants viewed the instructional cue (e.g., read aloud) prior to viewing and producing the stimulus. In Experiment 2, participants viewed the word and instruction simultaneously and waited until a later “Go” cue to speak. Both experiments demonstrated evidence showcasing the importance of distinctiveness and also the influence of other cognitive processes within the production paradigm.


identifier: Al-Tamimi, Mahmoud <https://research.library.mun.ca/view/creator_az/Al-Tamimi=3AMahmoud=3A=3A.html>   (2020) A micro-positioning motion system to enhance lithography in semiconductor manufacturing machines.  Masters thesis, Memorial University of Newfoundland.

abstract:
This study proposes a novel precision micro-motion system to enhance the lithography
process in the semiconductor manufacturing machines. This proposed micro-motion
system is a new smart-materials stage that integrates piezoelectric actuators in the
reticle stage of the future semiconductor manufacturing machines. The proposed
smart-materials based reticle (SMBR) implements piezoelectric actuators to a novel
flexure hinge-based mechanism to enhance the precision of the reticle stage; such
that it reduces the relative in-plane micro-positioning errors in the synchronization
motion between the reticle stage and the wafer stage in a time period less than
the current settling time in lithography machines, 10 ms. The proposed SMBR can
provide in-plane translational motions along x- and y-axes, and in-plane θz-rotational
motion around z-axis with an amount of 11:7462 μm x 11:7462 μm x 0:4713 mrad,
respectively, to correct the orientation of the reticle stage which governs the pattern
of the integrated circuit being printed. The proposed SMBR considers the current
dynamic performance of reticle stage of the semiconductor manufacturing machines;
such that (i) it corrects the in-plane synchronization errors in a time period less
than the settling time of the short-stroke, and (ii) the working frequency bandwidth
remains above 550 Hz. The proposed SMBR can be integrated with the precision motion systems of the semiconductor manufacturing machines to enhance the storage
capacity, the functionality of the devices, and the CPU processing capability.


identifier: Pretty, Ryan W. <https://research.library.mun.ca/view/creator_az/Pretty=3ARyan_W=2E=3A=3A.html>   (2020) Barriers to recruitment and participation in physical rehabilitation research: a mixed methods study among people with multiple sclerosis.  Masters thesis, Memorial University of Newfoundland.

abstract: Background: Quality medical treatment requires research that applies to clinical practice. Unfortunately, research participants do not represent the population seeking treatment, with Multiple Sclerosis (MS) rehabilitation research excluding those who have had a recent relapse and those with physical disability; two groups who often seek rehabilitation. There is likely a subset of people with MS who are being excluded from rehabilitation research. Purpose: To categorize those who are not willing to participate in MS rehabilitation research, and to identify facilitators and barriers to participation. Methods: We analyzed registry data collected during an MS clinic visit and a physical performance assessment. Participants had the option of consenting to one, both, or neither of these visits. Those who did not agree to the physical assessment were termed ‘non-participators’, and regression determined predictors of this decision. Interviews explored barriers to participation described by ‘non-participators’, and a patient engagement session with ‘participators’ considered their views on reported barriers. Results: There were 109 participators and 27 non-participators. Non-participators scored lower in cognition, and were more likely to live in an urban area. Those without cognitive impairment were 3.45 times more likely to participate in rehabilitation research. Interviews (n=8) revealed four themes: (1) fear and uncertainty regarding testing, (2) negative perceptions of research, (3) frustrations with healthcare, and (4) physical impairment as a barrier to participation. Patient engagement event (n=7) revealed three themes: (1) frustrations with healthcare, (2) perceiving participation as beneficial, and (3) interest in holistic treatment. Conclusion: About 19% of the sample were non-participators. Cognitive impairment predicted rehabilitation research non-participation. Fear and uncertainty, physical barriers and negative perceptions of research and healthcare influenced decisions among non-participators, while participators in physical rehabilitation research prioritized the overall benefits of research for themselves and to the community. For rehabilitation research to be applicable to the patients as intended, researchers must identify and overcome barriers and engage patients in the research process.


identifier: Zeinert, Logan R. <https://research.library.mun.ca/view/creator_az/Zeinert=3ALogan_R=2E=3A=3A.html>   (2020) Fisheries and aquaculture potential of the Caribbean spider crab Maguimithrax spinosisimus around Eleuthera, The Bahamas.  Masters thesis, Memorial University of Newfoundland.

abstract: The Caribbean spider crab Maguimithrax spinosissimus is the largest brachyuran crab in the Caribbean. In this thesis I investigated the population characteristics of M. spinosissimus on the island of Eleuthera, The Bahamas, as well as the potential of this crab to remove biofouling on marine aquaculture pens. In chapter 2 I investigated the size ranges of crabs at patch reefs, a blue hole and an anchialine pond in Eleuthera (January to June, 2018). Males reached larger mean carapace widths than females at all sites. Principal component analysis and hierarchical cluster analyses were used to determine size at maturity; males reached morphological and behavioural maturity at larger carapace widths than females. Haemolymph BRIX levels were used as an indicator of general condition, the levels were relatively high and not dissimilar between sites. The meat yield from male crabs was higher than that of females and comparable to other decapods. In chapter 3, I showed spider crabs exhibited a nocturnal pattern of activity in laboratory tanks. The crabs consumed 3.91 ± 0.35 and 6.97 ± 0.73 % of their bodyweight of algae in 22 - 24°C and 26 - 28°C water, respectively, and although the species is primarily herbivorous they also readily consumed whole fish. Spider crabs were placed on a heavily fouled, offshore aquaculture cage (SeaStation 3000) in confined mesh enclosures to determine if they could be used to remove biofouling organisms. They effectively removed 40 and 90 % of fouling organisms after two and four weeks, respectively, while showing no discriminatory feeding preferences. The crabs were more effective at removing fouling than manual diver scrubbing. The survival rates of crabs inside the aquaculture cage varied between 66.6% and 73.9% during 3 to 6 month trials. The data gathered for this species could be used to establish management plans for an artisanal fishery in the Bahamian archipelago, it also demonstrated the potential of the crab as an effective, environmentally friendly biofouling removing alternative for sustainable aquaculture.


identifier: Walsh, Nyissa <https://research.library.mun.ca/view/creator_az/Walsh=3ANyissa=3A=3A.html>   (2020) Exploring the feasibility of using cognitive behavioural therapy for insomnia to improve perceived cognitive impairment in survivors of breast cancer.  Masters thesis, Memorial University of Newfoundland.

abstract:
Objectives: The prevalence of both insomnia and cognitive impairment in survivors of breast
cancer is well documented. Although there are currently effective treatments for insomnia, very
few, if any, treatments are effective for improving cognitive impairment. This study evaluated
the feasibility and acceptability of using Cognitive Behavioural Therapy for Insomnia (CBT-I), a
gold-standard insomnia intervention, for the secondary benefit of improving perceived cognitive
impairment (PCI) in survivors of breast cancer.
Methods: We recruited 10 female survivors of breast cancer who resided in St. John’s,
Newfoundland. Participants underwent 7 weekly sessions of CBT-I treatment and completed
questionnaires to assess cognitive functioning, sleep, and psychological wellbeing at baseline, 2
months (post-treatment), and 3- and 6-months following treatment, for a total study time of 8
months. Repeated measures ANOVAs with pairwise comparisons were conducted to determine
changes in symptomology.
Results: Out of 45 participants screened, 10 were both eligible and enrolled, for a recruitment
feasibility rate of 22%. The intervention was highly acceptable with 100% of enrolled
participants completing treatment. There were statistically significant improvements in PCI [p <
.001, Ƞp² = .546], insomnia [p < .001, Ƞp² = .739], fatigue [p = .004, Ƞp² = .379] and depression
[p = .03, Ƞp² = .276], over the 8-month study period. Pairwise comparisons revealed significant
decreases in PCI from baseline to post treatment [p = .006], 3 months [p = .003] and 6 months [p
= .002].
Conclusions: CBT-I seems to be an acceptable and potentially efficacious option for improving
PCI in survivors of breast cancer, but future adequately powered randomized controlled trials are
needed to confirm these preliminary results. In order for such trials to recruit the required sample
size, they will likely need to screen 5 times the number of participants needed.


identifier: Chevez-Guardado, Ruben <https://research.library.mun.ca/view/creator_az/Chevez-Guardado=3ARuben=3A=3A.html>   (2020) Promotech: a universal tool for promoter detection in bacterial genomes.  Masters thesis, Memorial University of Newfoundland.

abstract:
A promoter is a genomic sequence where the transcription machinery binds to start
copying a gene into an RNA molecule. Finding the location of bacterial promoter sequences
is essential for microbiology since promoters play a central role in regulating
gene expression. There are several tools to recognize promoters in bacterial genomes;
however, most of them were trained on data from a single bacterium or a specific
set of sigma factors. Promotech was developed to overcome this limitation, offering
a machine-learning-based classifier trained to generate a model that generalizes and
detects promoters in a wide range of bacterial species. During the study, two model
architectures were tested, Random Forest and Recurrent Networks. The Random
Forest model, trained with promoter sequences with a binary encoded representation
of each nucleotide, achieved the highest performance across nine different bacteria
and was able to work with short 40bp sequences and entire bacterial genomes using a
sliding window. The selected model was evaluated on a validation set of four bacteria
not used during training, having 50% positive and 50% negative promoter sequences
resulting in an average AUPRC of 0.73±0.13 and an AUROC of 0.71±0.13. The
Random Forest model achieved an average AUPRC and AUROC across the validation
set's entire genomes of 0.14±0.1 and 0.71±0.17, but increased its performance
to 0.75±0.18 AUPRC and 0.90±0.06 AUROC when it was configured to detect promoter
clusters. Promotech was compared against state-of-the-art bacterial promoter
detection programs using the balanced data set and outperformed these methods.


identifier: Naskulwar, Kratika <https://research.library.mun.ca/view/creator_az/Naskulwar=3AKratika=3A=3A.html>   (2020) sRNARFTarget: a machine learning-based approach for sRNA target prediction.  Masters thesis, Memorial University of Newfoundland.

abstract:
Bacterial small regulatory RNAs (sRNAs) play a vital role in the regulation of gene
expression in bacteria. sRNAs regulate gene expression by interacting with mRNAs
or proteins. Bacterial sRNAs are involved in various processes, such as environmental
stress response, metabolism, and virulence. We need to identify the mRNAs and/or
proteins that these sRNAs interact with, to understand the functional roles of sRNAs.
These mRNAs or proteins are called targets of the sRNAs. There are several computational
tools available for sRNA target prediction; however, these tools have a high
number of false positives, and the most accurate tool requires sRNA sequence conservation
across bacteria. As a result of this research project, a machine-learning-based
method (sRNARFTarget) for sRNA target prediction applicable to any bacterium or
sRNA has been developed. In this thesis, we show that sRNARFTarget substantially
outperforms current non-comparative genomics-based methods in terms of running
time and ranking of true interactions.


identifier: Ping, William <https://research.library.mun.ca/view/creator_az/Ping=3AWilliam=3A=3A.html>   (2020) Hollow bamboo.  Masters thesis, Memorial University of Newfoundland.

title: Hollow bamboo

abstract:
William Ping, the narrator of the novel, Hollow Bamboo, is a typical, privileged millennial.
His life revolves around eating at restaurants and then posting online about eating at restaurants.
This all changes when a dinner with his Chinese girlfriend’s family forces him to confront
both his biracial identity and his ignorance of his own Chinese heritage. Midway through dinner,
Will suffers a potentially fatal injury and is visited by a dream-eating spirit named Mo who
whisks him into the past to learn about the life of his grandfather, the first William Ping, who
immigrated from China to Newfoundland in the 1930’s. Based on a true story, the novel recounts
the often brutal struggles, and occasional successes, faced by some of the first Chinese immigrants
in Newfoundland. A speculative biography, rehearsing familial anecdotes and personal
histories, tempered with the problematic authority of documented facts; this blend of historical
material and magical imaginings renders the novel a unique look at the integration and disintegration
of Chinese culture in the life of two William Pings.


identifier: Bell, Louise <https://research.library.mun.ca/view/creator_az/Bell=3ALouise=3A=3A.html>   (2020) Healthcare provider knowledge, beliefs, and attitudes regarding opioids for chronic non-cancer pain in North America: a systematic review.  Masters thesis, Memorial University of Newfoundland.

abstract: The aim of this review was to identify empirically supported barriers and facilitators for prescribing opioids for Chronic Non-Cancer Pain (CNCP) through a systematic review of qualitative literature. Six databases were searched from inception to June 3, 2019 for qualitative studies reporting on provider knowledge, attitudes, beliefs, or practices pertaining to prescribing opioids for CNCP in North America. Data were extracted, risk of bias rated, and confidence in evidence graded using Cochrane Confidence in the Evidence from Reviews of Qualitative research (CERQual). Constructs identified were coded using the Theoretical Domains Framework. Twenty-six studies reporting on 599 healthcare providers were included. Fourteen constructs were identified as barriers or facilitators to prescribing opioids for CNCP that fell within seven domains. Domains and constructs identified as barriers included: (1) Environmental Context, (a) patient-related salient events (e.g., overdose), (b) provider-related salient events (e.g., threat by patient), and (c) time constraints; (2) Emotion, (a) concerns over problematic use, addiction, dependence, tolerance, and side effects, and (b) regulatory scrutiny; (3) Knowledge; (4) Beliefs About Consequences; and (5) Beliefs About Capabilities. Domains and constructs identified as facilitators included: (1) Environmental Context, (a) lack of available non-opioid alternatives, and (b) institutional pressure; (2) Social Influences, (a) patient-provider relationship, and (b) patient-provider communication; (3) Goals; and (4) Knowledge on opioid prescribing tools. Understanding the barriers and facilitators that influence opioid-prescribing offers important insight into modifiable targets for interventions that can support providers in delivering care consistent with guidelines to manage CNCP, while minimizing risks.


identifier: Singleton, Christopher William <https://research.library.mun.ca/view/creator_az/Singleton=3AChristopher_William=3A=3A.html>   (2020) Examining the role of emotion regulation in dialectical behaviour therapy self-help for binge-eating disorder.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Background: Dialectical behavior therapy (DBT) for binge-eating disorder (BED) is
based on an emotion regulation (ER) model of BED. This model suggests that individuals
with BED struggle with ER and engage in binge-eating in an attempt to manage difficult
emotions (e.g., numbing, distracting). Thus, DBT for BED focuses on the development of
more adaptive ER skills so that individuals are less likely to binge eat to cope with
uncomfortable feelings. While DBT is an evidence-based treatment for BED, little
research has examined whether ER acts as a mechanism of change in DBT for BED. The
goal of the present study was to examine the role of ER in DBT self-help (DBT-SH) for
BED outcome. Methods: A secondary analysis of data from a recent randomized
controlled trial (RCT) of DBT-SH was conducted. A community sample of 71 adults
diagnosed with BED took part in the trial. Participants were randomized to receive either
DBT-SH or an active SH control condition for 12 weeks. Assessments of BED
symptoms, difficulties in ER, and global distress were conducted at baseline and post-treatment.
Results: Participants in both conditions demonstrated sizable improvements in
binge-eating and medium-magnitude improvements ER from pre-to-post-treatment.
However, there were no significant between-group differences in outcome and the
associated effect sizes were small. Contrary to expectations, within the DBT-SH group,
pre-post ER change did not significantly predict pre-post binge frequency change or post-treatment
remission status and treatment condition did not significantly moderate the
strength of this relationship. Effect sizes for these analyses were small. Discussion: The
current study failed to provide evidence that ER is a mechanism of change in DBT-SH.
Certain methodological limitations including small sample size and low statistical power should be considered when interpreting these results. However, it is also possible that
other mechanisms of change besides ER explain how DBT-SH works for BED. Clinical
implications and future directions are discussed.


identifier: Norman, Jordan M. <https://research.library.mun.ca/view/creator_az/Norman=3AJordan_M=2E=3A=3A.html>   (2020) Existing and conceptual ship-grillage stiffener optimization through maximizing overload capacity under transverse loads.  Masters thesis, Memorial University of Newfoundland.

abstract: The HMCS IROQUOIS naval destroyer was decommissioned in 2015. Six ship hull sections have been sent to Memorial University of Newfoundland for detailed structural analyses. An investigation has been undertaken to determine if significant improvements could be made to the IROQUOIS grillage panels. If significant improvements were possible it was important to determine how the grillage could then be optimized. The study focused on grillage stiffener design. Numerous stiffener designs were tested by varying factors related to their geometric and parametrized dimensions. Both finite element analysis and experimental design techniques were implemented within the study. The statistical significance of the studied factors was analyzed to develop more detailed and specific, experiments. Control runs were tested which consisted of built-T and flat bar stiffened panels, as well as the IROQUOIS grillage panels. An optimized concept grillage was produced which demonstrated an ability to outperform the control runs.


identifier: Babichuk, Nicole Allen <https://research.library.mun.ca/view/creator_az/Babichuk=3ANicole_Allen=3A=3A.html>   (2021) A fine kettle of fish: marine fish consumption, endocrine disrupting chemicals and thyroid hormones in rural Newfoundland.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Endocrine disrupting chemicals (EDCs), found in the environment, can cause hypothyroidism, infertility, and neurodevelopmental deficits. EDCs can be transported long distances on water currents and can bioaccumulate in marine food webs. Two water currents around Newfoundland are suspected of transporting EDCs to adjacent marine ecosystems. Newfoundlanders may be exposed to EDCs through consumption of local seafood contaminated with EDCs.
This study investigated EDC exposure in rural Newfoundland population by 1) testing local seafood species for the presence of EDCs, 2) determining the extent of local seafood consumption by surveying residents of two rural communities (Burin and New-Wes-Valley), 3) measuring serum thyroid hormones and plasma EDC concentrations in individuals who participated in the seafood consumption survey, and 4) exploring associations between seafood consumption, EDCs and thyroid hormones in participants. Liver samples from cod (Gadus morhua) and turbot (Scophthalmus maximus) showed the presence of polybrominated diphenyl ethers (PBDEs), which were commonly used as flame retardants. There were higher levels of PBDEs in fish samples from the west coast compared to those from the northeast coast of Newfoundland. Residents from the study communities consumed local cod more than any other species, and seafood consumption was higher in males than in females; and higher in older (> 50 years) than in younger (<50 years) participants. Increasing frequency of local cod consumption was positively associated with increasing PCB (-105, -118, -138, -170, -180 and ΣPCBs) and p,p’-DDE concentrations in participants. Therefore local cod consumption may be a source of exposure to these EDCs for rural Newfoundlanders.
All participants had at least 11 EDCs present in their plasma; polychlorinated biphenyl (PCB), polybrominated biphenyl (PBB) and dichlorodiphenyldichloroethylene (p,p’-DDE) concentrations were higher in older participants, reflecting exposure to EDCs that have since been discontinued; while PBDEs were higher in younger participants which aligns with their recent production and use. Participants from Burin had higher levels of PCBs and p,p’-DDE (legacy contaminants from Labrador current) while NWV participants had higher levels of PBB-153 and PBDEs (novel contaminants from St. Lawrence River). In conclusion, there is evidence that the rural Newfoundland population is exposed to EDCs through local seafood consumption.


identifier: Cucinelli, Alex <https://research.library.mun.ca/view/creator_az/Cucinelli=3AAlex=3A=3A.html>   (2020) A place for (almost) every thing and everything in its place: phonotactic effects on phonological development in Italian.  Masters thesis, Memorial University of Newfoundland.

abstract:
In learning their first language(s), children must acquire a phonemic inventory, a syllable shape
(e.g., CV, CVC, CCV), and an understanding of which phonemes can occupy which positions
within the syllable or word. In hierarchical representations, this can be accounted for through
constraints on dependency relationships, where the specification of segmental features in
dependent positions captures marked options. This thesis examines the phonological development
of four Italian-learning children, whose overall behaviour aligns with implicational relationships
proposed in the literature. I account for their behaviour through hierarchically organized prosodic
and segmental representations which reflect claims based on the notion of markedness. These
representations incorporate the prediction that early stages of acquisition and typologically
ubiquitous syllable shapes represent unmarked options, while syllable shapes learned relatively
late and those only allowed in typologically rare languages constitute more marked options. By
investigating prosodic development alongside segmental development in Italian, this thesis
contributes novel observations concerning the markedness of prosodic dependency in reference to
sonority and place or articulation, for example: liquid+consonant, strident+consonant coda-onset
clusters and consonant+liquid onset clusters all imply homorganic nasal+consonant coda-onset
clusters, which also means that complex onsets imply coda-onset clusters, both in child grammars
and in the typology of adult grammars.


identifier: Sadek, Mohamed M. <https://research.library.mun.ca/view/creator_az/Sadek=3AMohamed_M=2E=3A=3A.html>   (2020) Properties of self-consolidating concrete containing expanded slate lightweight aggregate.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis aimed to evaluate the performance of self-consolidating concrete using either lightweight fine expanded slate aggregate (LF) or lightweight coarse expanded slate aggregate (LC). The rheological and mechanical properties of the lightweight self-consolidating concrete (LWSCC) mixtures were evaluated, in addition to the impact resistance and the durability (including abrasion and salt scaling resistance). The variables in this study included the type of lightweight aggregate (LF and LC), lightweight aggregate volume, binder content (500 kg/m³, 550 kg/m³ and 600 kg/m³), and types of concrete (LWSCC, normal weight self-consolidating concrete and lightweight vibrated concrete). The research program was divided into three stages. The first stage included optimization of LWSCC using expanded slate aggregate to obtain mixtures with minimum possible density (while achieving acceptable fresh properties) and mixtures having a target density of 2000 kg/m³ with maximized compressive strength. The second stage included investigation on the mechanical properties and impact resistance, while the third stage covered the assessment of the durability of the optimized mixtures. The results showed higher flowability for the LWSCC mixtures when LF was used compared to LWSCC mixtures with LC. However, LWSCC mixtures with LF required more high range water reducer admixture to reach the acceptable level of flowability compared to LWSCC mixtures with LC. The results also revealed that LWSCC mixtures with LF had higher mechanical properties, impact resistance and abrasion resistance before and after the exposure to salt scaling compared to LWSCC mixtures with LC at the same density level. Additionally, the results showed that the stability of the LWSCC mixtures (using LC or LF) enhanced by increasing the binder content. Increasing the binder content also allowed for using more lightweight aggregate, thus resulting in lower density mixtures.


identifier: Senevirathna, Nushen M. <https://research.library.mun.ca/view/creator_az/Senevirathna=3ANushen_M=2E=3A=3A.html>   (2020) Kalman filter based ranging and clock synchronization for ultra wide band sensor networks.  Masters thesis, Memorial University of Newfoundland.

abstract:
This Thesis presents the design, implementation, and validation of a Kalman filterbased
range estimation technique to precisely calculate the inter-node ranges of Ultra
Wide Band (UWB) modules. In addition to that the development and validation of
an improved global clock synchronization framework is presented.
Noise characteristics of relative time measurements of a stationary UWB anchor pair
are first analyzed using an Allan deviation plot. To track the propagation of the
imprecise clocks on low cost UWB transceiver platforms, Kalman filters are used in
between every anchor pair. These filters track the variation of a remote anchor’s
hardware clock relative to it’s own hardware clock, while estimating the time of flight
between the anchor pair as a filter state. While adhering to a simple round robin
transmission schedule, both inbound and outbound message timestamp data are used
to update the filter. These measurements have made the time of flight observable in
the chosen state space. A faster relative clock filter convergence has been achieved
with the inclusion of the clock offset ratio as a measurement additional to the timestamps.
Furthermore, a modified gradient clock synchronization algorithm is used to achieve
global clock synchronization throughout the network. A correction term is used in the
gradient clock synchronization algorithm to enforce the global clock rate to converge
at the average of individual clock rates while achieving asymptotic stability in clock
rate error state. Stability of the original and modified methods for time invariant
hardware clocks are compared using eigenvalue tests. Experiments are conducted
to evaluate synchronization and ranging accuracy of the proposed range estimation
approach.


identifier: Tennakoon, Kusal B. <https://research.library.mun.ca/view/creator_az/Tennakoon=3AKusal_B=2E=3A=3A.html>   (2021) Place recognition and factor graph localization for mobile robots using Google indoor street view.  Masters thesis, Memorial University of Newfoundland.

abstract:
This thesis develops an indoor localization system for mobile robots using Google
indoor street view.
The proposed localization system consists of two main modules. The first is a place
recognition system based on Google’s indoor street view. Its purpose is to determine
the position of the robot in terms of the node on the street view map that is closest
to the robot’s actual location. It is achieved by comparing an image captured by the
robot’s camera against the indoor street view images. In order to achieve the best
accuracy possible, the input image is compared to every street view image. The system
employs two verification stages. The first stage is based on the visual similarity among
the images. The best five images that qualified through this stage become candidate
images for the second verification stage. In this stage, the geometric consistency
between the images is assessed. The image that passes this test with the highest
similarity score is considered a match with the input image. The proposed place
recognition system is tested on different data sets and the performance is assessed
using standard evaluation metrics.
The second part is the main module of the proposed localization system. It is a graph-based
estimation module that incorporates the odometry data, visual feedback, and
motion data that eventually is solved via optimization techniques. The result is the
estimates of the robot’s locations at specified intervals along its journey. It uses
odometry data to interpret connections among successive poses. Also, it uses visual
information from the robot’s camera to establish constraints between the robot’s poses
and the map. It is achieved through constraints derived using two images, one from
the robot’s camera and one from the node in the map that matches best with the
image from the robot’s camera. The localization system is designed to minimize the
drift caused by the odometer. The system is simulated and then tested for a data set
captured at the Memorial University of Newfoundland engineering building basement.
The performance of the system is evaluated using standard error metrics.


identifier: Atapattu, Sachithra H. <https://research.library.mun.ca/view/creator_az/Atapattu=3ASachithra_H=2E=3A=3A.html>   (2020) Estimating unknown dynamics of a quadrotor aerial vehicle artificial neural networks.  Masters thesis, Memorial University of Newfoundland.

abstract:
This thesis presents the use of artificial neural networks (ANN) to accurately estimate
the unmodelled dynamics of a quadrotor aerial vehicle. Due to the complexity of aerodynamic
models, ground effects, actuator non-linearities, and disturbances that occur
during operation, usually a complete dynamic modelling of a quadcopter is difficult
to achieve. A quadcopter’s flight stability mainly depends on its control system and
its navigation system. Therefore, the knowledge of the platform’s unknown dynamic
model will allow enhanced design of the autonomous system. This thesis focuses
on estimating the unmodelled dynamics using machine learning (ML) techniques to
achieve better design of control and navigation systems of quadcopters.
In this work, the dynamic behaviour of a quadcopter is expressed as a combination of a
nominal model and an unknown model. The nominal model is derived from classical
rigid-body dynamic equations, while ML approaches are used to estimate the unknown
model. Among the available ML techniques, two commonly used approaches;
Gaussian process regression (GPR) and ANN are evaluated in this thesis.
Training and testing of the methods were done offline, using a dataset gathered by
manually flying an AscTec Hummingbird quadcopter in an OptiTrack motion capture
environment. For the comparison of the selected ML techniques, the disturbance force
was learnt initially. Since ANN showed better results than GPR in initial comparison,
ANN was chosen and further evaluated with different architectures. The disturbances
in force and torque were learnt separately using two independent ANNs. These estimated
residual dynamics were added to the nominal dynamic model to obtain the
compound dynamics. The results demonstrate reduction in model error in comparison
to the nominal model.
To demonstrate the use of learnt residual dynamics in improved controller design,
a trajectory tracking controller was implemented in a simulated environment. This
simulation was designed to track a desired trajectory in the presence of added disturbances
estimated using the ANN model. The results are compared with the trajectory
tracking results obtained with only the nominal model. As expected, the controller
with disturbance correction using ANN model showed improved performance.


identifier: Stone, Jonathan <https://research.library.mun.ca/view/creator_az/Stone=3AJonathan=3A=3A.html>   (2020) Occupational noise exposures in aquaculture: assessment and mitigation strategy.  Masters thesis, Memorial University of Newfoundland.

abstract:
Noise-induced hearing loss has become an increasing concern for employees in the
aquaculture industry. Deafness, hearing loss and hearing impairment have all been
identified as some of the most common injury claims from aquaculture labourers.
Despite this information, noise levels and associated noise exposures in facilities have
been highly undocumented. This research aims to document information on noise
exposure in aquaculture and identify short- and long-term solutions to high exposures
experienced by employees. Data was collected at four aquaculture facilities in
Canada. Noise sources were identified and analyzed in narrowband frequency. Noise
exposures were also measured and compared with the recommendations outlined by
the Canadian Standards Association. Exposures were observed to be highest during
tasks within the vicinity of machinery and other mechanical equipment. Short-term
solutions were identified through the selection of appropriate hearing protection. Engineering
design solutions were then applied to assess the feasibility of long-term
solutions to reduce exposures in facilities. Numerical acoustic simulations were performed
on a facility model where the Design of Experiments methodology was applied
to validate its acoustical properties. The simulations showed that design solutions
could be applied to reduce noise transmission and lower exposure levels throughout
the facility.


identifier: Richards, Cerridwen <https://research.library.mun.ca/view/creator_az/Richards=3ACerridwen=3A=3A.html>   (2020) The link between seabird traits and anthropogenic threats with implications for conservation.  Masters thesis, Memorial University of Newfoundland.

abstract:
Seabirds are heavily threatened by anthropogenic activities and their conservation status is
deteriorating rapidly. Key goals for successful management and conservation are to identify
vulnerable species, and to evaluate conservation gains. Here, I couple a comprehensive
dataset of traits with International Union for Conservation of Nature (IUCN) Red List
extinction risk categories, and threat data for all 341 seabird species. I reveal seabirds
segregate in trait space based on threat status, and anthropogenic impacts are selectively
removing large, long-lived, pelagic surface feeders with small habitat breadths (Chapter 2).
Furthermore, I quantify species’ vulnerability to longline, trawl and purse seine bycatch, and
find bycatch mitigation could successfully conserve species’ traits at a global scale (Chapter
3). My results suggest targeted conservation strategies must be implemented to ensure a
functionally similar suite of seabirds will not be lost in the near future.


identifier: Rickert, Lauren <https://research.library.mun.ca/view/creator_az/Rickert=3ALauren=3A=3A.html>   (2020) Identifying individuals at risk for Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) caused by TMEM43 p. S358L: a genetics educational tool for primary care physicians.  Masters thesis, Memorial University of Newfoundland.

abstract:
Introduction: Newfoundland and Labrador (NL) has an increased incidence of Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) is caused by a p.S358L mutation in TMEM43, the first symptom of which may be sudden cardiac death (SCD). When diagnosed and treated, mortality is significantly reduced. Primary care physicians (PCPs) are often the first point of health system contact for families affected by ARVC. PCPs acknowledge the importance of integrating genetics into their practice, but report uncertainty regarding appropriate counseling and referral strategies. Web-based tools can be effective education methods. This project aimed to create a tool designed to increase the likelihood of appropriate management and referral of persons at risk of ARVC caused by p.S358L in TMEM43.
Methods: We used a multiple methods, iterative approach to develop an educational tool. This included initial creation, a working lunch with five PCPs, subsequent revision of the tool, use of pre-existing TMEM43 data providing additional family information and then further revision. It was distributed to a cohort of PCPs and Family Medicine Residents (n= 780) for feedback via an online survey containing nine Likert-scale questions, two qualitative questions and five demographic questions.
Results: Initial feedback requested greater clarity on whom to refer to appropriate genetic and cardiac services. Pedigree information showed that 56%, 39%, and 31% of affected persons had at least one first-, second-, or third degree relative with a known history of severe cardiac problems at time of their initial presentation. This information was then integrated into the updated version of the tool, to ensure PCPs are prompted to ask about patients family history, including first-, second-, and third-degree relatives. Opinion on the final tool was provided by 43 online surveys completed by PCPs in NL. Overwhelmingly positive responses were noted.
Discussion: Feedback from PCPs and multi-generational, historic pedigree information was used to create an educational tool for PCPs which may more easily identify those at risk for ARVC caused by the p. S358L mutation in TMEM43. Future research will evaluate the tool in practice.


identifier: Hall, Kelsi <https://research.library.mun.ca/view/creator_az/Hall=3AKelsi=3A=3A.html>   (2020) Are emotional memories harder to intentionally forget? A meta-analysis.  Masters thesis, Memorial University of Newfoundland.

abstract: The current meta-analysis explored whether emotional memories are less susceptible to item-method directed forgetting than neutral memories. The final sample used consisted of 31 studies with 36 independent samples. Basic analyses revealed superior memory for remember (R) than forget (F) items, with directed forgetting effects observed for both neutral, M = 19.6%, CI₉₅% [16.1%, 23.1%], and emotional, M = 15.1%, CI₉₅% [12.4%, 17.7%], conditions. Directed forgetting in either valence condition was larger for (a) words than complex stimuli; (b) recall than recognition tests; (c) studies that used recall prior to recognition; and, (d) studies that included buffer items. Comparison within-studies revealed diminished directed forgetting of emotional items compared to neutral, with an average difference of 4.2%, CI₉₅% [2.0%, 6.4%]. However, this finding varied, meaning that whether – and to what degree – emotional memories are more resilient than neutral memories depends on the methodological features of the study in question. Larger differences were present in studies where emotional items were more arousing than neutral and when buffer items were included. These findings suggest that emotional memories are (often) more resilient to intentional forgetting than neutral memories.


identifier: Wilson, Sarah M. <https://research.library.mun.ca/view/creator_az/Wilson=3ASarah_M=2E=3A=3A.html>   (2020) Following stones: navigating the landscape in northern Labrador.  Masters thesis, Memorial University of Newfoundland.

abstract: The landscape in northern Labrador is dotted with inuksuit (human-made rock stacks used for navigation, commemoration, hunting, and more) signifying a connection between people and the land. My theoretical framework considers the traditional knowledge, or way of knowing, respecting, and using resources from the environment, of Inuit in Labrador to understand ways of memorializing the landscape and place. Through an aerial survey via drone, this project involves collecting photogrammetric data to reconstruct 3D and digital elevation models of different features and sites. This project serves as an examination of the application of data that drones can collect in summer and winter settings. Geographic information systems (QGIS and ArcGIS) aid in examining the relation of inuksuit to topography and other features. This project looks at the relationship between humans and their surroundings, movement across vast spaces, methods of navigation, and connection to land to argue for the importance of protecting cultural landscapes.


identifier: Cooze, Alysha <https://research.library.mun.ca/view/creator_az/Cooze=3AAlysha=3A=3A.html>   (2020) Learning English as a second language during childhood: A longitudinal case study.  Masters thesis, Memorial University of Newfoundland.

abstract:
Since the 1950s, hypotheses have been put forth to explain developmental behaviours
observed during a learner’s second language (L2) acquisition. Many of these
hypotheses build on language transfer, which provides a basis for the explanation of
many phenomena that learners exhibit during the acquisition of their L2. However,
aspects of transfer have yet to be fully understood; among others, how the critical period
for language acquisition affects the relationship between a learner’s first language (L1)
and L2 has yet to be unfolded.
Transfer effects and the critical period are indeed potentially confounded when the L2
learner is a child. Furthermore, three questions surrounding transfer still remain. These
questions are as follows: What is transferred? What are the conditions for transfer? And
when does transfer occur? Further, while it is commonly observed that children are more
proficient than adults at language learning, debates still exist as to whether or not a
critical period for language acquisition exists at all. In relation to this, there is also the
debate concerning whether children introduced to an L2 early in life behave more like a
first or second language learner for that L2.
This thesis describes a longitudinal corpus documenting a child named Nura, who is a
L2 learner of English with Kazakh as her L1 (also with some passive knowledge of
Chinese). More specifically, we focus on Nura’s development of singleton onsets and
onset clusters which do not occur in her native Kazakh language. The data provides
evidence for relatively immediate transfer effects through her early acquisition of her
singleton onsets and onset clusters. However, the developmental patterns of a number
of sounds and sound combinations also point to issues in child L2 development in
contexts where transfer is not possible, if only for certain phonological dimensions of the
L2.


identifier: Ibrahim, Abdulhaqq Ameen <https://research.library.mun.ca/view/creator_az/Ibrahim=3AAbdulhaqq_Ameen=3A=3A.html>   (2021) Study of the chemistry of soured and chemically treated reservoir fluids and potential impact on microbial influenced corrosion in oil and gas production facilities.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
The chemical environment (e.g. soured produced water, oil, limited oxygen environments) plays an important role in microbial activities leading to microbiologically influenced corrosion (MIC). The major cause of reservoir souring and subsequent corrosion in oil and gas facilities is the increased concentration of H₂S in the system. Among the microbial groups associated with MIC, sulfate-reducing bacteria (SRB) produce H₂S as a metabolic product of sulfate reduction in anaerobic respiration to obtain energy. To mitigate the SRB activities, nitrate or nitrite is injected in the reservoir to displace SRB with nitrate reducers. H₂S and other sulfur (S) species, and nitrogen (N) species (nitrate/nitrite) present can impact the chemistry of the system and microbial activities leading to MIC. Also, the chemical–microbial interactions complicate the understanding of chemical species transformation and partitioning behavior in gas, water, and oil and the subsequent impact on corrosion. Hence, it is essential to assess the impact of the chemical environment on microbial activities with respect to the corrosion processes in the oil and gas facilities. Several studies by microbiologists and corrosion scientists focused on the understanding of MIC mechanisms independent of the surrounding chemical environment. However, little is known about the dynamic behavior of the chemical environment and the reactivity between S and N species under various conditions.
This thesis advances the understanding of MIC in light of the surrounding chemical environment by identifying and analyzing different chemical species and transformations associated with MIC, resulting from biotic and abiotic processes. Microbial activities are found to overlap with chemical/electrochemical processes leading to corrosion. The chemical environment, environmental factors, and microbial processes were examined to further understand the interactions and contributory impact on MIC. This work also describes the behavior of chemical species in a sulfide-oxic-nitrite environment as a function of temperature, pressure, and concentrations using equilibrium, and kinetic model approaches. The equilibrium simulation predicted the formation of Sᴼ, FeS, FeO(OH), and Fe₂O₃ as the key products, the amount of which varied depending on the chemistry and operating conditions. The kinetic model of the sulfide-oxic reaction in seawater showed a similar trend with the laboratory experiment in PW. The wet-lab experiments were conducted to study the reactivity of sulfide with nitrite under a range of conditions and generate kinetic data. Experiments indicated that sulfide in produced water (PW), seawater, and water is oxidized by nitrite to yield polysulfide, Sᴼ, and NH₄⁺ under weakly acidic to weakly basic conditions. However, sulfide forms insoluble FeS in the presence of Fe²⁺ in PW, which removes the sulfide from the oxidative transformation pathway.
The outcomes of this research provide a better understanding of the chemical environment impacting MIC. The understanding and information of S and N chemistry presented herein will provide insight into the chemical–microbial interactions in oil and gas operations under different conditions and inform further studies towards the development of robust MIC models.


identifier: Salman, Bora <https://research.library.mun.ca/view/creator_az/Salman=3ABora=3A=3A.html>   (2020) The governance of genomic research: the case studies of Iceland and Newfoundland and Labrador.  Masters thesis, Memorial University of Newfoundland.

abstract: Genomic research and databases came into prominence following the large- scale scientific research and investments into human genetics in the 1990s. Genome-based knowledge, which promises new diagnostic and therapeutic techniques, also produces political, economic, ethical, social, and regulatory dilemmas. The thesis examines the governmental, techno-scientific, and economic power-relations lodged in genomic research. The thesis focuses on Iceland and Newfoundland and Labrador as the cases, which attracted venture capital investments and research because genetically homogenous populations are ideal for conducting genetic research to detect the roots of the diseases. With a Foucauldian lens, the power relations between the subjects including, biotechnology and pharmaceutical companies, venture capitalists, patients’ groups, and state, are analyzed in parallel with neoliberal governance model. Biotechnology companies, investors, and governments play significant roles for supporting the biotech industry. Discourses of rational self-interest and personal responsibility are deployed, in particular cases national identity and ethnic pride are also articulated with the emphasis on the rational self. These discourses mask not only ethical concerns, but also power relations between the parties. The comparison of the governance alternatives in these two cases tries to offer insights regarding neoliberal governance model, which mobilizes individual conduct in line with political economic ends.