identifier: Mansourkiaie, Fatemeh <https://research.library.mun.ca/view/creator_az/Mansourkiaie=3AFatemeh=3A=3A.html>   (2016) Cooperative routing for collision minimization in wireless sensor networks.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Cooperative communication has gained much interest due to its ability to exploit the
broadcasting nature of the wireless medium to mitigate multipath fading. There has
been considerable amount of research on how cooperative transmission can improve the
performance of the network by focusing on the physical layer issues. During the past few
years, the researchers have started to take into consideration cooperative transmission in
routing and there has been a growing interest in designing and evaluating cooperative
routing protocols. Most of the existing cooperative routing algorithms are designed to
reduce the energy consumption; however, packet collision minimization using cooperative
routing has not been addressed yet. This dissertation presents an optimization framework
to minimize collision probability using cooperative routing in wireless sensor networks.
More specifically, we develop a mathematical model and formulate the problem as a
large-scale Mixed Integer Non-Linear Programming problem. We also propose a solution
based on the branch and bound algorithm augmented with reducing the search space
(branch and bound space reduction). The proposed strategy builds up the optimal routes
from each source to the sink node by providing the best set of hops in each route, the best
set of relays, and the optimal power allocation for the cooperative transmission links. To
reduce the computational complexity, we propose two near optimal cooperative routing
algorithms. In the first near optimal algorithm, we solve the problem by decoupling the
optimal power allocation scheme from optimal route selection. Therefore, the problem is formulated by an Integer Non-Linear Programming, which is solved using a branch
and bound space reduced method. In the second near optimal algorithm, the cooperative
routing problem is solved by decoupling the transmission power and the relay node se-
lection from the route selection. After solving the routing problems, the power allocation
is applied in the selected route. Simulation results show the algorithms can significantly
reduce the collision probability compared with existing cooperative routing schemes.


identifier: Hamilton, Gina <https://research.library.mun.ca/view/creator_az/Hamilton=3AGina=3A=3A.html>   (2016) Scope & nature of young sudden cardiac death in Newfoundland & Labrador.  Masters thesis, Memorial University of Newfoundland.

type: Thesis NonPeerReviewed

abstract:
Introduction: Sudden cardiac death (SCD) in young people (ages 2-40) is a tragedy
for families and communities alike. It has multiple causes, one of which is an
underlying genetic arrhythmogenic cardiomyopathy. A study from Ontario (ON)
using a 2008 cohort assessed the incidence of SCD in persons aged 2-40 years to be
2.64/100,000 person-years. We hypothesized that Newfoundland & Labrador (NL)
may have a higher incidence of early SCD in ages 2-40 due to possible underlying
genetic causes given the historical genetic isolation of the population and the
founder mutations already identified (ex. PKP2, RYR2, TMEM43).
Methods: We ascertained cases of sudden death from the comprehensive Medical
Examiners’ provincial database for the years 2008 and 1997; 2008 as a direct
comparison to ON, and 1997 as it represented a time when the implantable
cardioverter-defibrillator was not available in NL. Each case of sudden death was
individually analyzed to determine likelihood of SCD.
Results: There were 119 cases in 2008 and 157 cases in 1997. The incidence of SCD
for ages 2-40 in 2008 was 7.32/100,000 persons. This was significantly higher than
the incidence in Ontario. The incidence of SCD was not significantly higher in 1997
than 2008. Coronary artery disease was a major cause of death in all cohorts, similar
to Ontario (non-significant difference).
Conclusion: In general, there was a trend of more arrhythmogenic deaths in the
young and more structural cardiac deaths as age increased. This reflects the cause of
SCD in the young is often genetic in nature, while older deaths are often due to coronary artery disease, a disease heavily influenced by environment. To conclude,
SCD in NL occurs at a higher incidence than ON, further research is needed on the
topic.


identifier: Enright, Glenn <https://research.library.mun.ca/view/creator_az/Enright=3AGlenn=3A=3A.html>   (2016) The development and preliminary testing of an instrument to measure the perceived economic burden of a subtype of arrhythmogenic right ventricular cardiomyopathy (ARVC) on patients and families in Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract:
The goal of this thesis was to develop, construct, and validate the Perceived Economic
Burden scale to quantitatively measure the burden associated with a subtype
Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) in families from the island
of Newfoundland. An original 76 item self-administered survey was designed using
content from existing literature as well as themes from qualitative research conducted by
our team and distributed to individuals of families known to be at risk for the disease. A
response rate of 37.2% (n = 64) was achieved between December 2013 and May 2014.
Tests for data quality, Likert scale assumptions and scale reliability were conducted and
provided preliminary evidence of the psychometric properties of the final constructed
perceived economic burden of ARVC scale comprising 62 items in five sections.
Findings indicated that being an affected male was a significant predictor of increased
perceived economic burden in the majority of economic burden measures. Affected males
also reported an increased likelihood of going on disability and difficulty obtaining
insurance. Affected females also had an increased perceived financial burden. Preliminary
results suggest that a perceived economic burden exists within the ARVC population in
Newfoundland.


identifier: Castro, Damián <https://research.library.mun.ca/view/creator_az/Castro=3ADami=E1n=3A=3A.html>   (2015) Meating the social: sharing atiku-euiash in Sheshatshiu, Labrador.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
This work examines atiku-euiash (caribou meat) sharing practices in Sheshatshiu, Newfoundland and Labrador, and aims to elucidate an overarching question: how do sharing practices participate in the co-constitution of the Innu ‘social’? The ‘social’ is understood in this work as a descriptor that refers to the emergent properties of the Innu collective. The thesis is that sharing practices participate in the co-constitution of the Innu social and enact its boundaries. Inside these boundaries, atiku-euiash is more than simply a food resource: by realizing Innu values of generosity, respect and autonomy, sharing implicates the associations of human, animal, and animal masters that constitute the Innu world. Sharing is connected with the enskilment of the younger generations by their el-ders, and thus with the reproduction of Innu values through time. The ways of sharing are relevant because changes in such practices affect the constitution of the Innu social. Giv-en Euro-Canadian colonization, the Innu are in a fraught social space in which sharing is interrupted by colonization practices and values. Understanding sharing is necessary to develop policies that do not interrupt the reproduction of the Innu world
This work uses several research methods: participant observation, sharing surveys, and interviews. It also uses network analysis as sharing practices leave traces of giving and receiving actions and these traces can be represented as a network of givers, receivers and circulating caribou meat. There are two main ways in which caribou is hunted and shared: household-based hunts and community-based hunts. The household-based hunts are organized by the hunters themselves, who are able and willing to hunt. Community-based hunts are completely organized and funded by the SIFN or the Innu Nation. In or-der to understand the differences in the distribution of the two hunt types, the categories of centrality and clustering are used to show how the flow of atiku-eiuash and its associ-ated realization of values and enskilment correlate with different degrees of centralization inside the sharing clusters.


identifier: Edwards, Jenna <https://research.library.mun.ca/view/creator_az/Edwards=3AJenna=3A=3A.html>   (2015) Sociophonetic history of Newfoundland English in Happy Valley-Goose Bay, Labrador.  Masters thesis, Memorial University of Newfoundland.

abstract:
In this paper, I report on the variety of English spoken in the relatively new community
of Happy Valley-Goose Bay, Labrador. The efects of dialect contact and the process of
dialect levelling (Trudgill 1986; Britain 1997, Kerswill and Williams 2000; Kerswill 2002)
are observed by examining the development of several vowels in the Happy Valley-
Goose Bay vowel system. In this community the migrant generation showed evidence
of mixing. The frst generation showed the most evidence of levelling along with the
emergence of new distinctions. The second generation showed some evidence of
levelling, the emergence of new distinctions, and in some cases a return to patterns
present in the migrant generation. These results indicate that diferent vowels within a
dialect can move through the stages of dialect contact at diferent rates due to the
multitude of infuences on the process of dialect contact.


identifier: Smee, Joshua <https://research.library.mun.ca/view/creator_az/Smee=3AJoshua=3A=3A.html>   (2016) Building connections: political participation, social capital and the built environment in St. John's, Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract:
How does where we live affect how we live? Do characteristics of the built environment affect the civic and social lives of the people living there? This study examines these questions at the neighbourhood scale in the Canadian city of St. John's, Newfoundland.
To do so, it combines data from a survey measuring respondents' social capital (defined as a combination of social participation, social trust, and civic participation) and a "built environment audit" that records the built characteristics of each respondent's neighbourhood.
The study finds a significant, positive relationship between the walkability of a neighbourhood and the social capital of the people living there. This relationship is driven primarily by the effect of the built environment on voluntary participation and relationships with neighbours. The study also tests several methods of measuring walkability, and finds that an objective measure based on street geometry is the best predictor of social capital.


identifier: Wesley, Kathryn <https://research.library.mun.ca/view/creator_az/Wesley=3AKathryn=3A=3A.html>   (2015) The effect of economic inequality on voter turnout in Canadian federal elections, 1979-2011.  Masters thesis, Memorial University of Newfoundland.

abstract: Since the 1990s, voter turnout in Canadian federal elections has decreased considerably. During the same period, economic inequality significantly increased. Although there is much theoretical work, there have been few empirical studies examining the effect of economic inequality on voter turnout. Using data collected from both national and international sources, I conducted an aggregate level, time series analysis of national turnout and economic inequality for Canadian federal elections between 1979 and 2011. Moreover, this thesis tests Schattschneider's (1960) hypothesis, which argues that increasing rates of voter abstention are a result of economic inequality magnifying differences in relative power between affluent and non-affluent citizens. The findings indicate that economic inequality has a strong negative effect on voter turnout.


identifier: Withana, Kasun Chamara <https://research.library.mun.ca/view/creator_az/Withana=3AKasun_Chamara=3A=3A.html>   (2016) Identifying the major spilled oil constituents and fate in harsh offshore environments.  Masters thesis, Memorial University of Newfoundland.

abstract: The behaviour and fate of spilled oil in harsh marine environments, such as the North Atlantic and the Arctic Ocean are complex due to environmental factors and the composition of the crude. In order to develop appropriate oil spill prevention and management methods, we must first understand how the oil behaves in these harsh environmental conditions. This study focuses on determining the fate of oil in harsh marine environments by first identifying target compounds in the oil that can be used to determine the fate of a spill. This thesis presents the partitioning behaviour of six polycyclic aromatic hydrocarbons (PAHs), which represent different groups, and phenols in cold conditions. The smallest PAH, naphthalene, dominated in terms of concentration in water accommodated fraction (WAF) of oil, while the larger ringed PAHs presented at lower concentrations. The smallest oil-water partition coefficient was recorded by phenol which partitioned into the seawater more quickly than PAHs. The partitioning of larger PAHs was slower and they indicated high partition coefficients. The oil partitioning increased slightly as temperature increased from 4ᴼC to 15ᴼC. The oil loading (0.1 g/L to 10 g/L) also contributed in deciding the concentrations in water. The use of chemical dispersants is a common response to spills. This study identified that chemical dispersants can change the fate of an oil spill by increasing the availability of oil in seawater. The concentration of larger PAHs such as pyrene and chrysene increased significantly with the application of dispersants. The information obtained are used in developing a molecular imprinted polymer (MIP) sensor to identify oil spills in the North Atlantic Ocean.


identifier: Nicoll, Katherine Ilia <https://research.library.mun.ca/view/creator_az/Nicoll=3AKatherine_Ilia=3A=3A.html>   (2015) Provocative feature deletion: a syntactic model of agreement alternations in noun incorporation contexts.  Masters thesis, Memorial University of Newfoundland.

abstract:
The relationship between noun incorporation (NI) and the agreement alternations that
occur in such contexts (NI Transitivity Alternations) remains inadequately understood.
Three interpretations of these alternations (Baker, Aranovich & Golluscio 2005; Mithun
1984; Rosen 1989) are shown to be undermined by foundational or mechanical issues. I
propose a syntactic model, adopting Branigan's (2011) interpretation of NI as the result of
“provocative” feature valuation, which triggers generation of a copy of the object that
subsequently merges inside the verb. Provocation triggers a reflexive Refine operation
that deletes duplicate features from chains, making them interpretable for Transfer. NI
Transitivity Alternations result from variant deletion preferences exhibited during Refine.
I argue that the NI contexts discussed (Generic NI, Partial NI and Double Object NI)
result from different restrictions on phonetic and semantic identity in chain formation.
This provides us with a consistent definition of NI Transitivity Alternations across
contexts, as well as a new typology that distinguishes NI contexts, rather than
incorporating languages.


identifier: Albishi, Tasahil <https://research.library.mun.ca/view/creator_az/Albishi=3ATasahil=3A=3A.html>   (2012) Phenolic constituents and antioxidant activities of selected onion and potato varieties and their processing by-products.  Masters thesis, Memorial University of Newfoundland.

abstract:
Potato and onion processing produces a large an1ount of discards, tnainly peels
and skins. This study cotnpared the antioxidant activity of phenolic constituents of skin
and flesh of di fferent coloured onions (pearl skin, red skin, yellow skin, white skin, red
fl esh, sprouted red flesh) and potatoes (purple, russet, innovator, yellow). Phenolic
constituents were separated into free, esterified and bond fractions. The bound fraction
was extracted into diethyl ether after consecutive alkaline hydrolysis. The contribution
of free phenolics toward total phenolic content was significantly (p<0.05) higher than the
esterified and bound for onion skin extracts tested then those in the flesh. Phenolics were
present n1ainly in the free fonn in both onion skin and fl esh. The content of flavonoids
extracted from onion and potato skins was approxin1ately six titnes higher than that of
their fl esh counterparts. An1ong onion varieties, pearl onion skin showed the highest
phenolic content (26.4 mg quercetin equivalents/g freeze dried sample). Similarly, purple
potato peels had the highest phenolic content (13.85 mg gallic acid equivalents/g freeze
dried sample). The phenolic compounds in potatoes were predotninantly present in the
bound fonn in the peels of both lnnovator and Russet varieties ( 45.95-51.07o/o) while free
and esterified phenolics were predotninant in purple and yellow varieties. Red onion skin
was most effective in inhibiting DNA strand scission at 94.45o/o, and that of purple potato
peel was 91.02o/o. Sitnilar trends were observed for inhibition of LDL cholesterol
oxidation and free radical scavenging activities of satnples tested. HPLC-MS analysis
showed that quercetin, quercetin 3-glucoside, and kaempferol were the predominant phenolics in all onion extracts, while chlorogenic, caffeic, p-coumaric and ferulic acids
were predotninant in potato peels.


identifier: Grozinger, Kindra R. <https://research.library.mun.ca/view/creator_az/Grozinger=3AKindra_R=2E=3A=3A.html>   (2012) The role of tubedown in ocular endothelial permeability.  Masters thesis, Memorial University of Newfoundland.

abstract:
Tubedown (N aa15) is a protein that associates with the acetyltransferase Arrest
defective protein 1 (Naal 0) and is involved in the regulation of vascular homeostasis of
the retina. In endothelial cells Tubedown interacts with the actin-binding protein
Cortactin. Cortactin is a known regulator of the permeability of molecules through cells
(transcytosis) and between cells (paracytosis). Transcytosis is enhanced by the
phosphorylation of Cortactin at tyrosine residues. Recent studies have shown that stable
suppression of Tubedown expression leads to increased endothelial cell permeability.
Increased permeability leading to pathological angiogenesis is observed within patients
with wet age-related macular degeneration (AMD), proliferative diabetic retinopathy
(PDR), and retinopathy of prematurity (ROP). Previous studies have revealed that
patients with wet AMD, PDR, and ROP, have decreased levels of Tubedown in
correlation with areas of pathological angiogenesis. The present work aims to investigate
Tubedown's mechanistic involvement in retinal permeability pathways, to further
elucidate its role in ocular neovascular diseases.
Immunoprecipitation and western blotting techniques were used to explore
possible interactions between Tubedown and known regulators of permeability pathways:
Dynamin, Afadin-6 (AF-6), Y421-Phospho-Cortactin, c-Src, and Zona Occludins-1 (ZO-
1 ). These results provided evidence that the mechanism by which permeability is
regulated by Tubedown does not likely involve an interaction with Dynamin, AF -6, c-
Src, or Z0-1. The specific interaction of Tubedown with non-phosphorylated Cortactin
but not Y421-Phospho-Cortactin suggests that Tubedown may attenuate phosphorylation of Cortactin and subsequently decrease transcytosis. Furthermore, in vitro transient and
stable knockdown techniques for Tubedown expression were combined with
immunofluorescence microscopy to determine if reduced Tubedown levels affect the
distribution of the paracytosis regulator Z0-1 in cultured rhesus macaque retinalchoroidal
endothelial cells. While stable Tubedown knockdowns showed decreased
Z0-1 cell perimeter expression, transient Tubedown knockdowns had no effect on Z0-1
cell perimeter distribution. Tubedowns effect on Z0-1 perimeter distribution remains
inconclusive.


identifier: Ho, Nhu Phan Minh <https://research.library.mun.ca/view/creator_az/Ho=3ANhu_Phan_Minh=3A=3A.html>   (2012) Signaling pathways involved in tubedown regulation of retinal endothelial permeability.  Masters thesis, Memorial University of Newfoundland.

abstract:
Increased vascular permeability is the early physical manifestation of diseases
such as diabetic retinopathy (PDR) and age-related macular degeneration (AMD), which
are the leading causes of blindness. Previous studies in Drs. Gendron-Paradis lab have
suggested that Tubedown (Tbdn) is an important regulator of endothelial permeability in
the retina. Tbdn is a member of the Natl family of proteins that associate with the
acetyltransferase Ardl. Tbdn protein expression is suppressed in eye specimens from
patients with PDR and AMD. Moreover, the conditional endothelial specific Tbdn
knockdown mouse model (TIE2/rtTA/Enh-TREIASTBDN-1) was found to mimic the
pathological features of PDR and AMD and to have increased extravasation of Albumin.
Previously, we found that Tbdn co-immunoprecipitated with the actin binding protein
Cortactin and co-localized with Cortactin and F -actin in endothelial cytoplasmic and
cortex regions. Cortactin plays an essential role in the Albumin permeability pathway and
is a well-known substrate of c-Src. Tyrosine kinase c-Src not only phosphorylates
Cortactin but also takes part in signaling to increase the permeability of endothelial cells.
Based on this knowledge, we hypothesized that Tbdn knockdown would lead to
an increase in phospho-Cortactin and phospho-Src. Tbdn knockdown in vitro by siRNA
and stable transfection of an antisense Tbdn eDNA construct significantly increased
phospho-Cortactin and phospho-Src levels. In vivo, using the Tbdn knockdown mouse
model, we confirmed the increase in phospho-Src. Furthermore, human PD R specimens,
known for downregulation of Tbdn, also revealed robust levels of phospho-Src. These
results support the hypothesis that Tbdn regulates signaling pathways mediating retinal
endothelial cell permeability to Albumin by influencing Cortactin and c-Src. Future therapies for neovascular retinopathies could target Tbdn with the hope of preventing, and
not simply treating, these devastating causes of blindness.


identifier: Lucas, Heather M. <https://research.library.mun.ca/view/creator_az/Lucas=3AHeather_M=2E=3A=3A.html>   (2013) Characterizing the DNA binding sites of activationinduced cytidine deaminase: A mutagenesis approach.  Masters thesis, Memorial University of Newfoundland.

abstract:
Activation induced cytidine deaminase (AID) is a 198 amino acid DNA
mutating enzyme that converts deoxycytidine (dC) to deoxyuridine (dU) in singlestranded
DNA (ssDNA). AID activity is important for adaptive immune responses
with a key role during the affinity maturation of antibodies in activated Blymphocytes.
AID targets the trinucleotide motifWRC (W=A/T, R=A/G) on (ssDNA),
but neither its enzymatic mechanism(s) nor its modes of binding to ssDNA are
known, largely due to a lack of protein structural information. A model of the
enzymatic structure of AID suggested two potential ssDNA binding grooves on its
surface. To confirm or refute the presence of two substrate binding grooves (Groove
1 and 2); amino acid residues were mutated singly or in combination in Grooves 1
and 2 to evaluate changes in DNA binding affinities and AID enzyme activity velocity
compared to wild-type (wt) protein. Some AID mutants were inactive and had little
or no binding to DNA, while others retained these properties relative to the wt
enzyme. Contrary to our hypothesis, electrostatic interaction is not integral to AID
and substrate interaction as previously believed. Along with activity and binding,
conformational changes were confirmed in AID mutants, which could explain the
differences in enzymatic functionality. Our research suggests AID conformation is
key for substrate targeting and binding, and that putative Groove 1 likely contains
contact points with ssDNA substrate.


identifier: Mahmoud, Zeinab Mohamed Fahmy Abd ElBaky <https://research.library.mun.ca/view/creator_az/Mahmoud=3AZeinab_Mohamed_Fahmy_Abd_ElBaky=3A=3A.html>   (2012) 1H-Imidazol[4,5-c]quinoline derivatives as potential bioactive molecules synthesis and biological evaluation.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Imidazoquinolines are interesting heterocyclic systems. They are formed as a
result of the fusion between the imidazole five membered ring and quinoline,
benzopyridine, system. Different imidazoquinolines can be generated according to the
various positions of fusions; at least nine distinct combinations can be identified for this
scaffold. Interestingly, diverse biopharmaceutical applications and uses can also be
delineated according to each specific imidazoquinoline.
Pertinent to these facts, an account on the different synthetic approaches for the
possible imidazoquinolines prefaces this thesis. Furthermore, the thesis includes a
purposeful survey covering the various biological, pharmaceutical and industrial
applications are.
More specifically, the lH-imidazo[ 4,5-c ]quinoline nucleus is of significant
importance. Many members belonging to this specific nucleus are reported to possess
anticancer, antimicrobial and immunomodifing properties.
In an attempt to explore further applications for this specific nucleus, two
imidazo[ 4,5-c ]quinoline-based projects were launched. The first project explores the
effect of the insertion of a sulfur atom on the expected antimicrobial activity.
Accordingly, the 2-aryl, 2-acyl-, 2-carbamoyl-, and -azolylmethyl thiosubstitutedimidazo[
4,5-c ]quinoline derivatives have been synthesized adapting both conventional
and microwave techniques. The antimicrobial screening of the target compounds was
performed against some representatives of Gram-positive and Gram-negative bacteria. The null in activity was explained through a preliminary in silica study in comparison to
the control.
Furthermore, the second project was directed towards the synthesis of lHimidazo[
4,5-c ]quinoline-2-one derivatives as an extension of a previously established
quinoline-based project. This recent project was meant to synthesize novel antineoplastic
agents but with improved physicochemical properties. Unfortunately, the project was not
a fruitful one and had to be discontinued due to many reasons. The most important of
these reasons is that the successfully synthesized compounds failed to possess any
cytotoxic activity.


identifier: Wang, Jiankang <https://research.library.mun.ca/view/creator_az/Wang=3AJiankang=3A=3A.html>   (2012) Modification of marine oils and their biological significance.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Marine oils, such as seal blubber and menhaden oils offer a wide range of health benefits
and play a critical role in many functions in the human body. Their effects in alleviating
cancer cardiovascular disease, psychiatric disorders, Parkinson's disease and
inflammatory ailments have been well demonstrated in a large body of literature.
However, these oils are highly vulnerable to oxidation due to their high content of
polyunsaturated fatty acids (PUFA). There are a number of means to modify these marine
omega-3 oils in order to change their chemical and physical properties including
randomization, blending and acidolysis. In this study, the effect of randomization using
both chemical and enzymatic catalysts, as well as blending with antioxidant rich-wheat
germ oil on the oxidative stability of seal blubber and menhaden oils was investigated.
Meanwhile, lipase-catalysed acidolysis of p-coumaric acid with triolein, seal blubber and
menhaden oils was carried out in this work, followed by examination of the antioxidant
activities of the synthesized phenolic lipids in in vitro assays, food and biological
systems. The results indicated that both chemical and enzymatic randomization lead to
the redistribution of fatty acids among the stereoisomeric sn-1 ,3 and sn-2 positions of the
glycerol moiety of triaclyglycerols of seal blubber and menhaden oils. The changes in
oxidative stability were due to the loss of tocopherol and positional redistribution of fatty
acids, especially the unsaturated fatty acids. Blending with wheat germ oil modified fatty
acid composition and increased the tocopherol content of seal blubber and menhaden oils,
hence improving the oxidative stability of blended seal blubber and menhaden oils,
mainly due to the increased content of tocopherols, especially gamma- and deltatocopheols as the total content of unsaturated fatty acids before and after blending was
similar. Therefore, wheat germ oil served as a good stabilizer for marine oils tested.
Phenolic lipids derived from triolein, seal blubber oil and menhaden oil showed good
antioxidant potential in systems tested. The prepared phenolic lipids exhibited high
scavenging capacity towards 1, 1-diphenyl-2-picrylhydrazyl (DPPH) and peroxyl radicals,
and displayed reducing power, strong inhibitory effect in bleaching ~-carotene, human
low-density lipoprotein (LDL) cholesterol oxidation as well as radical-induced DNA
cleavage, which suggests that phenolic lipids derived from seal blubber and menhaden
oils may be used as potential stable marine oils for health promotion and disease risk
reduction.


identifier: Oldford, Dan <https://research.library.mun.ca/view/creator_az/Oldford=3ADan=3A=3A.html>   (2016) Quantifying confinement effects in ice impact loads.  Masters thesis, Memorial University of Newfoundland.

abstract: Ships and offshore structures, that encounter ice floes, tend to experience loads with varying pressure distributions within the contact patch. The effect of the surrounding ice adjacent to that which is involved in the contact zone has an influence on the effective strength. This effect has come to be called confinement. A methodology for quantifying ice sample confinement is developed, and the confinement is defined using two non-dimensional terms; a ratio of geometries and an angle. Together these terms are used to modify force predictions that account for increased fracturing and spalling at lower confinement levels. Data developed through laboratory experimentation is studied using dimensional analysis. The characteristics of dimensional analysis allow for easy comparison between many different load cases; provided the impact scenario is consistent. In all, a methodology is developed for analyzing ice impact testing considering confinement effects on force levels, with the potential for extrapolating these tests to full size collision events.


identifier: Alodhayb, Abdullah <https://research.library.mun.ca/view/creator_az/Alodhayb=3AAbdullah=3A=3A.html>   (2016) Development of calix[4]arene-functionalized microcantilever array sensing system for the rapid, sensitive and simultaneous detection of metal ions in aqueous solutions.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
The work described in this thesis was conducted with the aim of: 1) investigating the binding capabilities of calix[4]arene-functionalized microcantilevers towards specific metal ions and 2) developing a new16-microcantilever array sensing system for the rapid, and simultaneous detection of metal ions in fresh water.
Part I of this thesis reports on the use of three new bimodal calix[4]arenes (methoxy, ethoxy and crown) as potential host/guest sensing layers for detecting selected ions in dilute aqueous solutions using single microcantilever experimental system. In this work it was shown that modifying the upper rim of the calix[4]arenes with a thioacetate end group allow calix[4]arenes to self-assemble on Au(111) forming complete highly ordered monolayers. It was also found that incubating the microcantilevers coated with 5 nm of Inconel and 40 nm of Au for 1 h in a 1.0 M solution of calix[4]arene produced the highest sensitivity. Methoxy-functionalized microcantilevers showed a definite preference for Ca²⁺ ions over other cationic guests and were able to detect trace concentration as low as 10⁻¹² M in aqueous solutions. Microcantilevers modified with ethoxy calix[4]arene displayed their highest sensitivity towards Sr²⁺ and to a lesser extent Ca²⁺ ions. Crown calix[4]arene-modified microcantilevers were however found to bind selectively towards Cs⁺ ions. In addition, the counter anion was also found to contribute to the deflection. For example methoxy calix[4]arene-modified microcantilever was found to be more sensitive to CaCl₂ over other water-soluble calcium salts such as Ca(NO₃)₂ , CaBr₂ and CaI₂. These findings suggest that the response of calix[4]arene-modified microcantilevers should be attributed to the target ionic species as a whole instead of only considering the specific cation and/or anion.
Part II presents the development of a 16-microcantilever sensor setup. The implementation of this system involved the creation of data analysis software that incorporates data from the motorized actuator and a two-axis photosensitive detector to obtain the deflection signal originating from each individual microcantilever in the array. The system was shown to be capable of simultaneous measurements of multiple microcantilevers with different coatings. A functionalization unit was also developed that allows four microcantilevers in the array to be coated with an individual sensing layer one at the time. Because of the variability of the spring constants of different cantilevers within the array, results presented were quoted in units of surface stress unit in order to compare values between the microcantilevers in the array.


identifier: Anyemedu, Akua <https://research.library.mun.ca/view/creator_az/Anyemedu=3AAkua=3A=3A.html>   (2016) Knowledge and perceptions of domestic violence services among women in Ghana.  Masters thesis, Memorial University of Newfoundland.

abstract:
Support services are important to the mental and physical well-being of survivors
of intimate partner violence. However, researchers and service providers note that
survivors seldom report violence to formal domestic violence services in Ghana. Despite
calls from service providers for Ghanaians to report domestic violence, few studies have
focused on women’s knowledge and perceptions of formal domestic violence services in
Ghana and how these perceptions influence their help-seeking behaviour. This thesis
presents qualitative findings on Ghanaian women's knowledge and perceptions of formal
domestic violence services. Also, challenges to service delivery are explored. Results
revealed that awareness among respondents of available services was low. Additionally,
most respondents had negative perceptions of these formal services. This study
demonstrates that more educational campaigns need to be carried out to raise awareness
among Ghanaians on domestic violence and the formal interventions available in the
country. Additionally, service providers and policy makers must formulate programmes
and policies that are better suited to the uniqueness of the Ghanaian situation.


identifier: Shakhawat, Amin Md. <https://research.library.mun.ca/view/creator_az/Shakhawat=3AAmin_Md=2E=3A=3A.html>   (2016) Noradrenergic modulatoins of odor learning and odor representation in the rat.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
How experience alters neuronal ensemble dynamics and how locus coeruleus-mediated norepinephrine release facilitates memory formation in the brain are the topics of this thesis. Here we employed a visualization technique, cellular compartment analysis of temporal activity by fluorescence in situ hybridization (catFISH), to assess activation patterns of neuronal ensembles in the olfactory bulb (OB) and anterior piriform cortex (aPC) to repeated odor inputs. Two associative learning models were used, early odor preference learning in rat pups and adult rat go-no-go odor discrimination learning.
With catFISH of an immediate early gene, Arc, we showed that odor representation in the OB and aPC was sparse (~5-10%) and widely distributed. Odor associative learning enhanced the stability of the rewarded odor representation in the OB and aPC. The stable component, indexed by the overlap between the two ensembles activated by the rewarded odor at two time points, increased from ~25% to ~50% (p = 0.004-1.43E⁻4; Chapter 3 and 4).
Adult odor discrimination learning promoted pattern separation between rewarded and unrewarded odor representations in the aPC. The overlap between rewarded and unrewarded odor representations reduced from ~25% to ~14% (p = 2.28E⁻⁵). However, learning an odor mixture as a rewarded odor increased the overlap of the component odor representations in the aPC from ~23% to ~44% (p = 0.010; Chapter 4).
Blocking both α- and β-adrenoreceptors in the aPC prevented highly similar odor discrimination learning in adult rats, and reduced OB mitral and granule ensemble stability to the rewarded odor. Similar treatment in the OB only slowed odor discrimination learning. However, OB adrenoceptor blockade disrupted pattern separation and ensemble stability in the aPC when the rats demonstrated deficiency in discrimination (Chapter 5). In another project, the role of α₂-adrenoreceptors in the OB during early odor preference learning was studied. OB α2-adrenoceptor activation was necessary for odor learning in rat pups. α₂-adrenoceptor activation was additive with β-adrenoceptor mediated signalling to promote learning (Chapter 2).
Together, these experiments suggest that odor representations are highly adaptive at the early stages of odor processing. The OB and aPC work in concert to support odor learning and top-down adrenergic input exerts a powerful modulation on both learning and odor representation.


identifier: Nandan, Anirudh <https://research.library.mun.ca/view/creator_az/Nandan=3AAnirudh=3A=3A.html>   (2016) Advanced control of managed pressure drilling.  Masters thesis, Memorial University of Newfoundland.

abstract:
Automation of managed pressure drilling (MPD) enhances the safety and increases
efficiency of drilling and that drives the development of controllers and observers
for MPD. The objective is to maintain the bottom hole pressure (BHP) within the
pressure window formed by the reservoir pressure and fracture pressure and also to
reject kicks. Practical MPD automation solutions must address the nonlinearities
and uncertainties caused by the variations in mud flow rate, choke opening, friction
factor, mud density, etc. It is also desired that if pressure constraints are violated the
controller must take appropriate actions to reject the ensuing kick. The objectives
are addressed by developing two controllers: a gain switching robust controller and a
nonlinear model predictive controller (NMPC). The robust gain switching controller
is designed using H1 loop shaping technique, which was implemented using high gain
bumpless transfer and 2D look up table. Six candidate controllers were designed in
such a way they preserve robustness and performance for different choke openings and
flow rates. It is demonstrated that uniform performance is maintained under different
operating conditions and the controllers are able to reject kicks using pressure control
and maintain BHP during drill pipe extension. The NMPC was designed to regulate
the BHP and contain the outlet flow rate within certain tunable threshold. The
important feature of that controller is that it can reject kicks without requiring any
switching and thus there is no scope for shattering due to switching between pressure
and flow control. That is achieved by exploiting the constraint handling capability of
NMPC. Active set method was used for computing control inputs. It is demonstrated
that NMPC is able to contain kicks and maintain BHP during drill pipe extension.


identifier: Olanipekun, Babatunde John <https://research.library.mun.ca/view/creator_az/Olanipekun=3ABabatunde_John=3A=3A.html>   (2016) Origin of dolomites and associated porosities in lower ordovician boat harbour formation carbonates, western Newfoundland, Canada.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
The Boat Harbour Formation constitutes the upper part of the Lower Ordovician St. George Group on the Northern Peninsula, western Newfoundland. It varies in thickness from 140 m at Main Brook to 96 m at Daniel’s Harbour (about 200km). Dolomitization of the carbonate sequence is more pervasive in the lower 30–40 m at Main Brook, whereas at Daniel’s Harbour the section is entirely dolomitized.
Petrography suggests that the formation has been affected by three phases of dolomitization: earliest (near-surface/syn-sedimentary) phase is D1 dolomicrite, mid–burial phase D2 dolomite, and late stage D3 dolomite. The earliest (near-surface/syn-sedimentary) phase is D1 dolomicrite. The geochemical composition suggests that D1 was developed from fluids of a mixture of meteoric and marine waters at near-surface conditions.
The mid–burial phase D2 dolomite consists of coarse planar sub–euhedral crystals that precipitated from hot fluids that circulated through crustal rocks with progressive burial. The late stage D3 dolomite has large and coarse non–planar crystals that exhibit sweeping extinction. In addition to its micro-thermometric data these factors suggest that it likely precipitated during deeper burial in pulses and from hot fluids.
For porosity the data suggest that it is mainly associated with the mid–burial D2 dolomite. Intercrystalline porosity is the dominant type and it varies in the formation from <1 to 8 % at Main Brook and from 7 to 12 % at Daniel’s Harbour.
Recrystallization to more stoichiometric dolomite is usually accompanied by characteristic textural and geochemical signatures. These signatures are primarily studied using multiple populations of crystals, comparison of modern and ancient dolomites, or from results of high temperature dolomite formation experiments. This approach is inadequate.
Therefore study was done using multi proxy high resolution approaches to carry out imaging and ion microprobe elemental analyses of individual dolomite (burial) crystals viz: Scanning Electron Microscopy (SEM), SEM based cathodoluminescence (SEM-CL), Secondary Ion Mass Spectrometer (SIMS). This is to better understand geochemical variations across the crystal traverses and to constrain possible conditions of crystal growth.
The study reveals multiple mechanisms of dolomite crystal growth within constrained diagenetic settings and also shows that recrystallization and episodes of dolomitization evidenced by multi-crystal population, are also apparent within dolomite crystals. Further to this, photo-luminescence (PhL) features of the dolomite crystals were obtained using epifluorescence microscope. Combined with SEM-CL, SIMS measured Mn, Fe and REE-Y content of zoned and unzoned dolomite crystal facies are correlated with their luminescence characters (Chapter Four).
The study affirms that, at low concentrations (<200 ppm), the correlation of activators (Mn and REE) and quenchers (Fe) with occurrence and intensity of luminescence remains speculative. Broadly speaking, REE-Y content was too low to control luminescence and Fe could not be conclusively demonstrated to have caused quenching, using the employed methods.
Morphology and genesis of nanopores and micro-inclusions hosted in intracrystalline areas of dolomites and their association/s with dolomite formation was investigated (Chapter Five). Burial dolomite samples of the Boat Harbour Formation were subjected to Broad Ion Beam (BIB) argon milling. Thereafter, Scanning Electron Microscope (SEM) was used to examine, at high resolution, micrometer to nanometer scale pores hosted in the crystals of the dolomites. Intracrystalline nanopores are abundant within the burial dolomite crystals. They are shown to have developed as a result of imperfection associated with the alignment process of crystallites’ agglomeration. This occurred during the formation of the dolomite’s major crystal face. Furthermore, the origin of mineral inclusions, ‘which are accidentals’ in intracrystalline nanopores is related to the mechanism of dolomitization that involves dissolution of precursor carbonate mineral (calcite or early dolomite) and precipitation of dolomite.


identifier: Budden, Shawn <https://research.library.mun.ca/view/creator_az/Budden=3AShawn=3A=3A.html>   (2016) The role of supraspinal excitability in the development of healthy-limb deficits following anterior cruciate ligament injury.  Masters thesis, Memorial University of Newfoundland.

abstract: In the current study, we examined how supraspinal and spinal excitability were altered bilaterally after unilateral anterior cruciate ligament reconstruction (ACLr). 7 participants with ACLr and 7 healthy controls underwent transcranial magnetic stimulation (TMS) and electrical stimulation. To evaluate supraspinal excitability, resting motor thresholds (RMT) and motor evoked potential (MEP) stimulus response curves (SRC) were used. To measure spinal excitability, H-reflex SRC gain was assessed. Mixed factorial ANOVAs were used to compare measures between limbs and between groups. Cohen’s d was used to assess effect sizes between groups. Data indicated no significant differences between subject groups or between limbs. However, large effect sizes were found between limbs for H-reflex gain and RMTs suggesting that ACLr can have an effect on some of the variables examined. This study identified decreases in strength in the injured limbs and that subjects with an ACL injury exhibited decreases in spinal and supraspinal excitability of the quadriceps compared to Healthy controls.


identifier: Brad, Dragos <https://research.library.mun.ca/view/creator_az/Brad=3ADragos=3A=3A.html>   (2015) Critical pegagogy in ELT: perspectives and praxis of western English teachers in Korean post-secondary education.  Masters thesis, Memorial University of Newfoundland.

abstract: Presently, there are numerous Native English Teacher (NETs) teaching in Korean post-secondary educational (PSE) institutions. The aim of this thesis is to explore the views held by NETs with regards to their self-perceived teaching perspectives while working in a Korean PSE setting. The thesis also aims to answer the assertion made in the literature that English as Foreign Language (EFL) teachers are "acritical and atheoretical". To this end, the thesis intends to identify the extent of the NETs’ preference for social reform as a teaching perspective, the NETs stated reasons for identifying with roles as social reformers, how these views are reflected in the NETs’ practice (praxis), what the barriers impeding the adoption and enactment of social reform are, and how the NETs’ perspectives relate to critical pedagogy. The results reveal that NETs in Korean PSE do not align themselves with social reform, yet categorizing NETS as "acritical and atheoretical" may be overly-simplistic. The results show that there are three kinds of obstacles that prevent NETs from engaging more with social reform and being less acritical and atheoretical: 1) NETs teaching in Korean EFL are conflicted and/or confused about their roles as English teachers; 2) there are significant cultural constraints to teaching in Korean EFL as a NET; 3) there are significant pedagogical constraints to teaching in Korean EFL as a NET.


identifier: Kelly, Dion O. <https://research.library.mun.ca/view/creator_az/Kelly=3ADion_O=2E=3A=3A.html>   (2016) Potential impact of invasive anuran species in western Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract: Successful dispersal and establishment of invasive anurans (frogs and toads) may be influenced by competitive exclusion and/or niche differentiation with competing species. I investigated the dispersal of anurans in western Newfoundland using anuran calling surveys and pond-edge visual encounter surveys. The Mink Frog, Lithobates septentrionalis, had dispersed ~50 km northeast from the original (2001) discovery location and ~34 km southwest; displaying spatial separation from Green Frogs, Lithobates clamitans, at landscape and local scales. Visual encounter surveys did not reveal any correlation between adult Mink Frogs and odonate competitors. Additionally, I assessed the impact of varying tadpole densities on removal of epilithic periphyton by providing epilithon covered substrates for American Toad, Anaxyrus americanus, tadpoles raised in laboratory or field enclosures. Higher tadpole densities resulted in smaller tadpoles that removed more periphyton from substrates. As anuran population ranges expand, there may be effects on ecological resources for vertebrate and invertebrate competitors.


identifier: Roskams-Edris, Dylan <https://research.library.mun.ca/view/creator_az/Roskams-Edris=3ADylan=3A=3A.html>   (2016) Acting on impulse: using the neuroscience of impulse control to improve the law.  Masters thesis, Memorial University of Newfoundland.

abstract:
This thesis investigates the potential legal utility of neurotechnologies which measure correlates of impulsive behaviors. Chapter 1 explains my philosophical position and how this position compares to others in the field. Chapter 2 explores some of the technical concepts which must be understood for the discussion of neurotechnologies and their applications to be fruitful. These chapters will be important for both explaining the capabilities of a neuroscientific approach to neural abnormalities as well as how they relate to the kind of regulation in which the law is engaged.
The purpose of Chapter 3 will be a descriptive account of Canadian law where I will begin to explore how to apply ideas and experiments from neuroscience to specific areas of law. Chapter 3 will look at actual examples of Canadian criminal law and will span topics from the creation of law to the construction of appropriate sentences.
Chapter 4 will debate if and how we should apply the neuroscientific perspective to the law given the ethical concerns surrounding the applications described in Chapter 3. The thrust of the chapter is that the development of the law does not occur in a vacuum and any alteration either to the laws themselves, how they are interpreted, or the technologies used to provide evidence, must have an ethical justification, that is, a way in which the proposed change will better meet the needs of society and the ethical objectives of the law. Sometimes these justifications can be drawn directly from constitutional documents, such as the Charter, or from the Criminal Code, while at other times these justifications depend upon arguments about furthering meaningful responsibility and therapeutic outcomes.


identifier: Pardy, Jeff <https://research.library.mun.ca/view/creator_az/Pardy=3AJeff=3A=3A.html>   (2016) The tonglen experiences of individuals with established sitting meditation practices: a grounded theory study.  Masters thesis, Memorial University of Newfoundland.

abstract: While there is an ever expanding body of research on various forms of meditation, there is currently a relative absence of academic literature on tonglen. A form of meditation which involves both visualizations and breathing elements, during tonglen one takes in the negativity and suffering experienced by others and, in return, sends back happiness and compassion. The current study explores the tonglen meditation experiences of individuals who have established sitting meditation practices. A qualitative, grounded theory approach was used in looking at what tonglen means to participants, how they engage with the practice, why they practice tonglen, and what they perceive to be the benefits of tonglen in the context of a 28 day practice period. Based on the findings from this study, a model was developed that describes the tonglen experiences of participants.


identifier: Johansen, Alf Christian <https://research.library.mun.ca/view/creator_az/Johansen=3AAlf_Christian=3A=3A.html>   (2016) Dynamic fault tree analysis with PEWMA modeling of event rates and Bayesian updating of material balance parameters using MCMC.  Masters thesis, Memorial University of Newfoundland.

abstract: This research explores Bayesian updating as a tool for estimating parameters probabilistically by dynamic analysis of data sequences. Two distinct Bayesian updating methodologies are assessed. The first approach focuses on Bayesian updating of failure rates for primary events in fault trees. A Poisson Exponentially Moving Average (PEWMA) model is implemnented to carry out Bayesian updating of failure rates for individual primary events in the fault tree. To provide a basis for testing of the PEWMA model, a fault tree is developed based on the Texas City Refinery incident which occurred in 2005. A qualitative fault tree analysis is then carried out to obtain a logical expression for the top event. A dynamic Fault Tree analysis is carried out by evaluating the top event probability at each Bayesian updating step by Monte Carlo sampling from posterior failure rate distributions. It is demonstrated that PEWMA modeling is advantageous over conventional conjugate Poisson-Gamma updating techniques when failure data is collected over long time spans. The second approach focuses on Bayesian updating of parameters in non-linear forward models. Specifically, the technique is applied to the hydrocarbon material balance equation. In order to test the accuracy of the implemented Bayesian updating models, a synthetic data set is developed using the Eclipse reservoir simulator. Both structured grid and MCMC sampling based solution techniques are implemented and are shown to model the synthetic data set with good accuracy. Furthermore, a graphical analysis shows that the implemented MCMC model displays good convergence properties. A case study demonstrates that Likelihood variance affects the rate at which the posterior assimilates information from the measured data sequence. Error in the measured data significantly affects the accuracy of the posterior parameter distributions. Increasing the likelihood variance mitigates random measurement errors, but casuses the overall variance of the posterior to increase. Bayesian updating is shown to be advantageous over deterministic regression techniques as it allows for incorporation of prior belief and full modeling uncertainty over the parameter ranges. As such, the Bayesian approach to estimation of parameters in the material balance equation shows utility for incorporation into reservoir engineering workflows.


identifier: Patterson, Heather M. <https://research.library.mun.ca/view/creator_az/Patterson=3AHeather_M=2E=3A=3A.html>   (2016) Attachment, psychological functioning, and resilience within the street involved youth populations: describing youth who access community agency support.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Youth homelessness is defined within the literature as youth who have left their homes and are living independent of parental figures and/or caregivers, have no stable residence or source of income, and lack access to the supports needed to make the challenging transition into adulthood (Canadian Observatory on Homelessness, 2015). Previous research studying homeless (or street-involved) youth has primarily focused on risk factors hindering the development of this population, and has largely ignored resilience, coping, and help-seeking behaviours. The current study examined the attachment styles (both categorically and dimensionally), psychological functioning, resilience, and help-seeking behaviours in street-involved youth of St. John’s, Newfoundland. Face-to face interviews were completed over a four-month period with 63 youth (42 males, 21 females) aged 15-29 (Mage = 20.00), recruited from a local community organization providing outreach services to street-involved youth. Results revealed the disproportionate struggles of the street-involved youth population, and highlighted higher levels of attachment insecurity, psychological distress and lower resilience compared to normative peers. Findings also showed a significant difference in psychological functioning, overall resilience, and emotional reactivity based on individual attachment style. In an exploratory model of help-seeking, a positive relationship was found between overall resilience (defined as a sense of mastery and sense of relatedness) and frequency of community service access. However, contrary to predictions, no relationships were found between frequency of community service access and attachment, psychological functioning, or emotional reactivity. Implications of the present findings in development of interventions for street-involved youth are discussed, in addition to strengths and limitations of the present research, and suggested areas of future inquiry.


identifier: Wu, Hongjing <https://research.library.mun.ca/view/creator_az/Wu=3AHongjing=3A=3A.html>   (2016) Integrated sensitivity analysis, calibration, and uncertainty propagation analysis approaches for supporting hydrological modeling.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
The successful performance of a hydrological model is usually challenged by the quality of the sensitivity analysis, calibration and uncertainty analysis carried out in the modeling exercise and subsequent simulation results. This is especially important under changing climatic conditions where there are more uncertainties associated with climate models and downscaling processes that increase the complexities of the hydrological modeling system. In response to these challenges and to improve the performance of the hydrological models under changing climatic conditions, this research proposed five new methods for supporting hydrological modeling.
First, a design of experiment aided sensitivity analysis and parameterization (DOE-SAP) method was proposed to investigate the significant parameters and provide more reliable sensitivity analysis for improving parameterization during hydrological modeling. The better calibration results along with the advanced sensitivity analysis for significant parameters and their interactions were achieved in the case study.
Second, a comprehensive uncertainty evaluation scheme was developed to evaluate three uncertainty analysis methods, the sequential uncertainty fitting version 2 (SUFI-2), generalized likelihood uncertainty estimation (GLUE) and Parameter solution (ParaSol) methods. The results showed that the SUFI-2 performed better than the other two methods based on calibration and uncertainty analysis results. The proposed evaluation scheme demonstrated that it is capable of selecting the most suitable uncertainty method for case studies.
Third, a novel sequential multi-criteria based calibration and uncertainty analysis (SMC-CUA) method was proposed to improve the efficiency of calibration and uncertainty analysis and control the phenomenon of equifinality. The results showed that the SMC-CUA method was able to provide better uncertainty analysis results with high computational efficiency compared to the SUFI-2 and GLUE methods and control parameter uncertainty and the equifinality effect without sacrificing simulation performance.
Fourth, an innovative response based statistical evaluation method (RESEM) was proposed for estimating the uncertainty propagated effects and providing long-term prediction for hydrological responses under changing climatic conditions. By using RESEM, the uncertainty propagated from statistical downscaling to hydrological modeling can be evaluated.
Fifth, an integrated simulation-based evaluation system for uncertainty propagation analysis (ISES-UPA) was proposed for investigating the effects and contributions of different uncertainty components to the total propagated uncertainty from statistical downscaling. Using ISES-UPA, the uncertainty from statistical downscaling, uncertainty from hydrological modeling, and the total uncertainty from two uncertainty sources can be compared and quantified.
The feasibility of all the methods has been tested using hypothetical and real-world case studies. The proposed methods can also be integrated as a hydrological modeling system to better support hydrological studies under changing climatic conditions. The results from the proposed integrated hydrological modeling system can be used as scientific references for decision makers to reduce the potential risk of damages caused by extreme events for long-term water resource management and planning.


identifier: Yuan, Hao <https://research.library.mun.ca/view/creator_az/Yuan=3AHao=3A=3A.html>   (2016) Labeling large scale social media data using budget-driven One-class SVM classification.  Masters thesis, Memorial University of Newfoundland.

abstract:
The social media classification problems draw more and more attention in the
past few years. With the rapid development of Internet and the popularity of computers,
there is astronomical amount of information in the social network (social
media platforms). The datasets are generally large scale and are often corrupted by
noise. The presence of noise in training set has strong impact on the performance
of supervised learning (classification) techniques. A budget-driven One-class SVM
approach is presented in this thesis that is suitable for large scale social media data
classification.
Our approach is based on an existing online One-class SVM learning algorithm,
referred as STOCS (Self-Tuning One-Class SVM) algorithm. To justify our choice,
we first analyze the noise-resilient ability of STOCS using synthetic data. The experiments
suggest that STOCS is more robust against label noise than several other
existing approaches. Next, to handle big data classification problem for social media
data, we introduce several budget driven features, which allow the algorithm to be
trained within limited time and under limited memory requirement. Besides, the
resulting algorithm can be easily adapted to changes in dynamic data with minimal
computational cost. Compared with two state-of-the-art approaches, Lib-Linear and
kNN, our approach is shown to be competitive with lower requirements of memory
and time.


identifier: Zhao, Hailiang <https://research.library.mun.ca/view/creator_az/Zhao=3AHailiang=3A=3A.html>   (2015) An investigation of the perceptions of foreign ESL teachers in China towards teacher accountability: a comparison between Chinese ESL teachers and foreign ESL teachers in China.  Masters thesis, Memorial University of Newfoundland.

abstract:
This study investigated external and internal accountability of foreign ESL teachers in China through a comparison with Chinese local ESL teachers. A cross-sectional survey design was used. Two research questions were developed from a literature review to examine foreign ESL teachers' perceptions toward external accountability and internal accountability.
Questionnaires from forty-five ESL teachers and eighty-one Chinese local ESL teachers were collected through an on-line survey. Data of teachers' perceptions towards four constructs: external accountability (outside expectations), external accountability (school management), internal accountability (professional duty), and internal accountability (feelings about work), were analyzed. The findings showed that foreign teachers perceived that they were held externally accountable with regard to outside expectations, and they were not held externally accountable for school management. In terms of internal accountability, foreign teachers perceived that they held themselves highly accountable in both the construct of professional duty and the construct of feelings about work.


identifier: Dai, Jie <https://research.library.mun.ca/view/creator_az/Dai=3AJie=3A=3A.html>   (2016) Numerical simulation for dynamic positioning in pack ice.  Masters thesis, Memorial University of Newfoundland.

abstract:
This thesis investigates the numerical modelling of Dynamic Position (DP) in pack
ice. A two-dimensional numerical model for ship-ice interaction was developed using
the Discrete Element Method (DEM). A viscous-elastic ice rheology was adopted
to model the dynamic behaviour of the ice floes. Both the ship-ice and the ice-ice
contacts were considered in the interaction force. The environment forces and the hydrodynamic
forces were calculated by empirical formulas. After the current position
and external forces were calculated, a Proportional-Integral-Derivative (PID) control
and thrust allocation algorithms were applied on the vessel to control its motion and
heading.
The numerical model was coded in Fortran 90 and validated by comparing computation
results to published data. Validation work was first carried out for the ship-ice
interaction calculation, and former researchers’ simulation and model test results were
used for the comparison. With confidence in the interaction model, case studies were
conducted to predict the DP capability of a sample Arctic DP vessel.


identifier: Evans, Jillian Nicole <https://research.library.mun.ca/view/creator_az/Evans=3AJillian_Nicole=3A=3A.html>   (2016) Ichnology and palaeobiology of Phoebichnus trochoides and Schaubcylindrichnus heberti comb. nov.  Masters thesis, Memorial University of Newfoundland.

abstract: The three-dimensional reconstructions of Phoebichnus trochoides and Schaubcylindrichnus (Palaeophycus) heberti created as part of this thesis allow us to fully understand and characterize the three-dimensional morphology and palaeobiology of these common taxa. Three-dimensional reconstructions demonstrate that P. trochoides is a large stellate burrow composed of numerous long galleries produced by a deposit feeding organism. This study reports for the first time that the central zone is composed of stacked disk-shaped layers of highly bioturbated sediment, the radial burrows are composed of a sand-rich lining of pelleted annuli surrounding an active sand-rich fill, and the presence of subtle conical features above the radial galleries that are inferred to result from collapse cone feeding. Reconstructions of heberti demonstrate that the thick walled burrows are composed of sand-rich annular rings, are a broad U-shape, and may be either clustered or isolated. Our observations show that the morphology of heberti is inconsistent with the generic diagnosis of Palaeophycus, but is morphologically comparable to Schaubcylindrichnus, and is herein synonymised with Schaubcylindrichnus to create S. heberti comb. nov. The three-dimensional reconstructions have revealed a number of hitherto unknown morphological elements to both taxa which has facilitated new interpretations of the trace-makers behaviour. The data improves the taxonomic understanding of both P. trochoides and S. heberti which require significant taxonomic change and emendation of diagnoses at the species and genus level.


identifier: Arowolo, Kayode Mathews <https://research.library.mun.ca/view/creator_az/Arowolo=3AKayode_Mathews=3A=3A.html>   (2016) Learning from speech prompts in a computer-based tutorial on electric circuits.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Despite the acknowledged roles speech may play in multimedia instructional packages, there is yet no consensus on how to integrate speech in multimedia learning resources. Researchers in multimedia learning advocate for clearer directions on the role of audio in multimedia instruction.
This dissertation was concerned with two design guidelines for incorporating speech in multimedia instruction. Mann’s temporal speech cueing (that is, a multimedia learning environment with graphics and a brief spoken instruction, direction, or hint) and Mayer’s off-loading textual information into narration to “balance the input” (that is, a multimedia learning environment with graphics and a balance of spoken and on-screen information). Three versions of an Electric Circuits’ Tutorial (ECT) were developed ─ convergent temporal speech cueing version based on Mann’s structured sound function model, and the narrated screen text and on-screen text versions based on Mayer’s off-loading textual information into narration. The aim was to compare the learning processes in the three versions in order to determine which version would help below-average high school Physics students in Nigeria to focus their attention on critical information in the tutorial.
The following research questions guided the study: How do Ilorin Senior Secondary School (SSS) (grade 11) students in the convergent temporal speech cueing group, narrated screen text group, and on-screen text group differ in their attentional focus on the electric circuits tutorial?, how do Ilorin SSS students (grade 11) in the three groups differ in their performance following the intervention with the Electric Circuits Tutorial?, and how do Ilorin SSS students (grade 11) in the three groups differ in their learning of electric circuits after a latency period of six weeks?
Analyses of the self-explanations of the three experimental groups revealed that the three groups were significantly different from each other in the quality of participants’ self-explanations. However, the analyses of the posttest and delayed posttest data show that between groups modality effect was non-significant. Therefore, in order to integrate digitized speech in multimedia instruction for below-average students in Nigeria, instructional designers need to question existing design guidelines. Both the temporal speech cues and narrated text have their roles in instructional multimedia.


identifier: Unikela, Kiran Sagar <https://research.library.mun.ca/view/creator_az/Unikela=3AKiran_Sagar=3A=3A.html>   (2014) Synthesis and Properties of a Series of 1,1,n,n-Tetramethyl[n](2,11)teropyrenophanes.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
The work described in this thesis revolves around the 1,1,n,ntetramethyl[n](2,11)teropyrenophanes,
which are a series of [n]cyclophanes with a
severely bent, board-shaped polynuclear aromatic hydrocarbons (PAH).
The thesis is divided into seven Chapters. The first Chapter conatins an overview
of the seminal work on [n]cyclophanes of the first two members of the “capped rylene”
series of PAHs: benzene and pyrene. Three different general strategies for the synthesis
of [n]cyclophanes are discussed and this leads in to a discussion of some slected
syntheses of [n]paracyclopahnes and [n](2,7)pyrenophanes. The chemical, structural,
spectroscopic and photophysical properties of these benzene and pyrene-derived
cyclophanes are discussed with emphasis on the changes that occur with changes in the
structure of the aromatic system. Chapter 1 concludes with a brief introduction to
[n]cyclophanes of the fourth member of the capped rylene series of PAHs: teropyrene.
The focus of the work described in Chapter 2 is the synthesis of of 1,1,n,ntetramethyl[n](2,11)teropyrenophane
(n = 6 and 7) using a double-McMurry strategy.
While the synthesis 1,1,7,7-tetramethyl[7](2,11)teropyrenophane was successful, the
synthesis of the lower homologue 1,1,6,6-tetramethyl[6](2,11)teropyrenophane was not.
The conformational behaviour of [n.2]pyrenophanes was also studied by 1H NMR
spectroscopy and this provided a conformation-based rationale for the failure of the
synthesis of 1,1,6,6-tetramethyl[6](2,11)teropyrenophane.
Chapter 3 contains details of the synthesis of 1,1,n,n-tetramethyl[n](2,11)teropyrenophanes
(n = 7-9) using a Wurtz / McMurry strategy, which proved to be more general than the double McMurry strategy. The three teropyrenophanes were obtained in
ca. 10 milligram quantities. Trends in the spectroscopic properties that accompany
changes in the structure of the teropyrene system are discussed. A violation of Kasha’s
rule was observed when the teropyrenophanes were irradiated at 260 nm.
The work described in the fourth Chapter concentrates on the development of
gram-scale syntheses of 1,1,n,n-tetramethyl[n](2,11)teropyrenophanes (n = 7–10) using
the Wurtz / McMurry strategy. Several major modifications to the orginal synthetic
pathway had to be made to enable the first several steps to be performed comfortably on
tens of grams of material. Solubility problems severely limited the amount of material
that could be produced at a late stage of the synthetic pathways leading to the evennumbered
members of the series (n = 8, 10). Ultimately, only 1,1,9,9-
tetramethyl[9](2,11)teropyrenophane was synthesized on a multi-gram scale. In the final
step in the synthesis, a valence isomerization / dehydrogenation (VID) reaction, the
teropyrenophane was observed to become unstable under the conditions of its formation
at n = 8. The synthesis of 1,1,10,10-tetramethyl[10](2,11)teropyrenophane was achieved
for the first time, but only on a few hundred milligram scale.
In Chapter 5, the results of an investigation of the electrophilic aromatic
bromination of the 1,1,n,n-tetramethyl[n](2,11)teropyrenophanes (n = 7–10) are
presented. Being the most abundant cyclophane, most of the work was performed on
1,1,9,9-tetramethyl[9](2,11)teropyrenophane. Reaction of this compound with varying
amounts of of bromine revealed that bromination occurs most rapidly at the symmetryrelated
4, 9, 13 and 18 positions (teropyrene numbering) and that the 4,9,13,18-
tetrabromide could be formed exclusively. Subsequent bromination occurs selectively on the symmetry-related 6, 7, 15 and 16 positions (teropyrene numbering), but considerably
more slowly. Only mixtures of penta-, hexa-, hepta and octabromides could be formed.
Bromination reactions of the higher and lower homologues (n = 7, 8 and 10) revealed that
the reactivity of the teropyrene system increased with the degree of bend. Crystal
structures of some tetra-, hexa-, hepta- and octa-brominated products were obtained.
The goal of the work described in Chapter 6 is to use 1,1,9,9-
tetramethyl[9](2,11)teropyrenophane as a starting material for the synthesis of warped
nanographenophanes. A bromination, Suzuki-Miyaura, cyclodehydrogenation sequence
was unsuccessful, as was a C–H arylation / cyclodehydrogenation approach. Itami’s
recently-developed K-region-selective annulative -extension (APEX) reaction proved to
be successful, affording a giant [n]cyclophane with a C84 PAH. Attempted bay-region
Diels-Alder reactions and some cursory host-guest chemistry of teropyrenophanes are
also discussed.
In Chapter 7 a synthetic approach toward a planar model compound, 2,11-di-tbutylteropyrene,
is described. The synthesis could not be completed owing to solubility
problems at the end of the synthetic pathway.


identifier: Charron, Louis <https://research.library.mun.ca/view/creator_az/Charron=3ALouis=3A=3A.html>   (2016) Restoring forests degraded by overabundant moose on the island of Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract:
Global forests are being degraded at an alarming rate; hence ecological restoration
becomes an integral component ensuring future forest health. Beneficial effects of
restoration will arise from scientifically based practices that are efficient and effective.
On the island of Newfoundland, moose (Alces alces) have become overabundant since
their introduction in early 1900’s. Intensive selective browsing by moose on foundation
species such as balsam fir (Abies balsamea) interacts with natural insect disturbance and
limits advanced regeneration, creating moose meadows. In this thesis, I focused on where
and how active restoration should be implemented in Terra Nova National Park
(Newfoundland, Canada) balsam fir forests within the context of the natural disturbance
regime under conditions of overbrowsing. Environmental surveys and experimental
seedling planting were carried out along a disturbance gradient from closed canopy forest
to large insect-disturbed stands. To develop cost-effective and science-based planting
protocols, several ground treatments were tested to enhance seedlings success: (1)
control, field planting, (2) removal of the aboveground vegetation and (3) ground
scarification. Results indicate that (1) priority for restoration should be given to insectdisturbed
areas > 5 ha rather than smaller gaps, and (2) that active restoration should be
implemented following scientifically determined field planting protocols, as no
substantial benefit was detected following ground treatment. The recommendations
arising for this thesis allow for the development of efficient and effective protocols
towards the reestablishment of multi-aged balsam fir forests in Newfoundland.


identifier: Stolze, Lina Marie <https://research.library.mun.ca/view/creator_az/Stolze=3ALina_Marie=3A=3A.html>   (2016) Environmental controls on bioturbation processes in marine benthic habits.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Through bioturbation, the macrofauna mediate chemical, physical and biological processes in marine benthic ecosystems. Because of the importance of bioturbation as ecosystem mediator, various studies have been conducted on bioturbation intensity and depth, and the relation of bioturbation processes to environmental condition and ecosystem state. This thesis builds on those previous studies, using a standard field and analytical protocol and by expanding the geographical scale to three climatic regions along Canada’s East Coast and Arctic margins, the Arctic Archipelago, the coastal Subarctic (Labrador Fjords), and the temperate continental climate zone (Gulf of Maine and adjacent Scotian shelf/slope). This Ph.D. study provides a comprehensive assessment of environmental influences on bioturbation along gradients in latitude and ocean depth. Bioturbation intensity, mixing depth, and bioturbation structures were studied in relation to the quantity and quality of potential food sources (organic matter) and substrate characteristics to gain an understanding of the environmental controls on bioturbation in these regions. The three main research chapters of this thesis are divided based on the contrasting climatic and geographical regions studied.
The analytical approach included seabed sampling with a boxcorer, describing the sedimentary fabric and bioturbation structures by X-radiography, estimating bioturbation intensity and depth applying a biodiffusion model to particle tracer profiles of ²¹⁰Pbₓs, ²²⁸Thₓs, ²³⁴Thₓs, and chlorophyll-a, and analyzing benthic organic matter and substrate characteristics. Strong regional and cross-climatic relations of bioturbation processes with combinations of environmental factors were observed. In particular, bioturbation depth and the vertical extent of bioturbation structures responded to the environmental patterns observed and, therefore, represented potentially applicable predictors of environmental conditions and ecosystem state. The results of this Ph.D. study may be further extended to other geographical regions with similar environmental characteristics to predict the effects of benthic habitat alterations through environmental stresses on a global scale. Integrated with biological data produced by fellow CHONe scientists the presented data may provide valuable information about functional roles of macrofaunal species and community traits in marine benthic ecosystems along Canada’s extensive East Coast and Arctic margins.


identifier: Yang, Lu <https://research.library.mun.ca/view/creator_az/Yang=3ALu=3A=3A.html>   (2016) Regional flood frequency analysis for Newfoundland and Labrador using the L-Moments index-flood method.  Masters thesis, Memorial University of Newfoundland.

abstract:
The L-moments based index-flood procedure had been successfully applied for Regional Flood Frequency Analysis (RFFA) for the Island of Newfoundland in 2002 using data up to 1998. This thesis, however, considered both Labrador and the Island of Newfoundland using the L-Moments index-flood method with flood data up to 2013. For Labrador, the homogeneity test showed that Labrador can be treated as a single homogeneous region and the generalized extreme value (GEV) was found to be more robust than any other frequency distributions. The drainage area (DA) is the only significant variable for estimating the index-flood at ungauged sites in Labrador.
In previous studies, the Island of Newfoundland has been considered as four homogeneous regions (A,B,C and D) as well as two Water Survey of Canada's Y and Z sub-regions. Homogeneous regions based on Y and Z was found to provide more accurate quantile estimates than those based on four homogeneous regions. Goodness-of-fit test results showed that the generalized extreme value (GEV) distribution is most suitable for the sub-regions; however, the three-parameter lognormal (LN3) gave a better performance in terms of robustness. The best fitting regional frequency distribution from 2002 has now been updated with the latest flood data, but quantile estimates with the new data were not very different from the previous study.
Overall, in terms of quantile estimation, in both Labrador and the Island of Newfoundland, the index-flood procedure based on L-moments is highly recommended as it provided consistent and more accurate result than other techniques such as the regression on quantile technique that is currently used by the government.


identifier: Abedini Laksar, Mohammad Javad <https://research.library.mun.ca/view/creator_az/Abedini_Laksar=3AMohammad_Javad=3A=3A.html>   (2016) Active suspension development based on energy analysis.  Masters thesis, Memorial University of Newfoundland.

abstract:
This research focuses on developing active suspension optimal controllers for two
linear and non-linear half-car models. A detailed comparison between quarter-car and
half-car active suspension approaches is provided for improving two important scenarios
in vehicle dynamics, i.e. ride quality and road holding. Having used a half-car vehicle model,
heave and pitch motion are analyzed for those scenarios, with cargo mass as a variable.
The governing equations of the system are analysed in a multi-energy domain package, i.e.,
20-Sim. System equations are presented in the bond-graph language to facilitate
calculation of energy usage. The results present optimum set of gains for both ride quality
and road holding scenarios are the gains which has derived when maximum allowable
cargo mass is considered for the vehicle. The energy implications of substituting passive
suspension units with active ones are studied by considering not only the energy used by
the actuator, but also the reduction in energy lost through the passive damper. Energy
analysis showed less energy was dissipated in shock absorbers when either quarter-car or
half-car controllers were used instead of passive suspension. It was seen that more energy
could be saved by using half-car active controllers than the quarter-car ones. Results also
proved that using active suspension units, whether quarter-car or half-car based, under
those realistic limitations is energy-efficient and suggested.


identifier: Rossong, Melanie A. <https://research.library.mun.ca/view/creator_az/Rossong=3AMelanie_A=2E=3A=3A.html>   (2016) Impacts of newly established non-indigenous green crab (Carcinus maenas) on native fauna in Placentia Bay, Newfoundland.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The recent invasion of the European green crab (Carcinus maenas) populations in Placentia Bay, Newfoundland and Labrador (NL) raises great concern about potential impacts on local fisheries and native biodiversity. Green crab are highly adaptable and in both native and invaded areas, green crab are well established predators that can outcompete other similarly sized decapods. The main objectives of this thesis were to: 1) identify the native species that green crab compete with for resources; 2) determine the depths and substrate types in which these interactions likely occur; 3) assess the indirect effects of green crab on native crustaceans and their changes in behavior; 4) assess the impacts of green crab on benthic community structure; 5) compare the NL population with other Atlantic Canadian populations in terms of competitive abilities; and 6) compare morphological features of the NL population with other Atlantic Canadian populations. I found that green crab overlap in space and diet with both rock crab (Cancer irroratus) and American lobster (Homarus americanus), potentially leading to a shift in habitat. Laboratory studies on naïve juvenile lobster also suggested shifts in behavior related to green crab, in that lobster decreased foraging activity and increased shelter use in the presence of green crab. Benthic community analyses showed fewer species in mud, sand, and eelgrass sites heavily populated by green crab compared to sites without green crab, although results depended on the taxa involved and I could not eliminate environmental differences through a short term caging study. Foraging ability of green crab varied in intraspecific competition experiments, with populations from NL and Prince Edward Island dominating longer-established populations from Nova Scotia and New Brunswick. Additional studies excluded claw size as a factor driving these results and behavioral differences likely reflected differences in invasion time and population genetics. Overall, green crab in Placentia Bay appear to be altering community structure of benthic invertebrates through predation and they also appear to indirectly impact native crustaceans through competition.


identifier: Rittenhouse, Matthew A. <https://research.library.mun.ca/view/creator_az/Rittenhouse=3AMatthew_A=2E=3A=3A.html>   (2015) Effects of seasonally varying temperature and salinity on the dynamics of sea lice (Lepeophtheirus salmonis).  Masters thesis, Memorial University of Newfoundland.

abstract: Sea lice (Lepeophtheirus salmonis) are an economically significant parasite in salmonid aquaculture. They exhibit temperature-dependent development rates and salinity-dependent mortality, which can greatly impact sea lice population dynamics, but no deterministic models have incorporated these seasonal variables. To understand how seasonality affects sea lice population dynamics, I derive a delay differential equation model with temperature and salinity dependence. I find that peak reproductive output in Newfoundland and British Columbia differs by four months. A sensitivity analysis shows sea lice abundance is most sensitive to variation in mean annual water temperature and salinity, whereas it is lease sensitive to infection rate. Additionally, I investigate the effects of production cycle timing on sea lice management and find that optimal production cycle start times are between the 281st and 337th days of the year in Newfoundland. I also demonstrate that adjusting follow-up treatment timing in response to temperature can improve treatment regimes. My results suggest that effective sea lice management requires consideration of local temperature and salinity patterns.


identifier: Cheng, Jiaqi <https://research.library.mun.ca/view/creator_az/Cheng=3AJiaqi=3A=3A.html>   (2016) Synthesis and surface reactivity of ZnO: application to gas and photon detection.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
This work employs different synthesis techniques to control the surface properties
of polycrystalline ZnO for sensing device applications. ZnO micro-scale
and nano-scale particles were made by various solid-state, solvothermal, and
high temperature synthesis techniques that are designed for controlling crystal
habit, surface polarity and surface area. The ZnO samples exhibited
different degrees of degradation when exposed to ambient water and CO2,
which were linked to ZnO surface dissolution and crystal growth conditions.
In addition, a strategy for controlling the hydroxide in the products of the
solid-state metathesis has been developed.
Thin film gas sensors were assembled using the ZnO products. The capacitance
responses of ZnO particles were evaluated after exposure to volatile
organic compounds (ethanol and hexane) at various operation temperatures
between 20 and 500⁰C. The results showed that gas sensing processes at
low temperatures were mediated by the ambient humidity when detecting
hydrophilic gases, and the responses from ZnO nanoparticles were greatly
enhanced at high temperatures. Furthermore, a preliminary study for UV activated gas sensing was conducted to examine the effect of UV light radiation
on the electrical properties of the ZnO samples, in which the AC frequency
dependence of the photoresponse was revealed by electrical impedance spectroscopy.


identifier: Wang, Junshi <https://research.library.mun.ca/view/creator_az/Wang=3AJunshi=3A=3A.html>   (2016) Time-domain simulation of wave-induced ship motions by a Rankine panel method.  Masters thesis, Memorial University of Newfoundland.

abstract:
In this thesis, a numerical program has been developed to simulate the wave-induced
ship motions in the time domain. Wave-body interactions have been studied for
various ships and floating bodies through forced motion and free motion simulations
in a wide range of wave frequencies.
A three-dimensional Rankine panel method is applied to solve the boundary value
problem for the wave-body interactions. The velocity potentials and normal velocities
on the boundaries are obtained in the time domain by solving the mixed boundary integral
equations in relation to the source and dipole distributions. The hydrodynamic
forces are calculated by the integration of the instantaneous hydrodynamic pressures
over the body surface. The equations of ship motion are solved simultaneously with
the boundary value problem for each time step.
The wave elevation is computed by applying the linear free surface conditions. A
numerical damping zone is adopted to absorb the outgoing waves in order to satisfy
the radiation condition for the truncated free surface. A numerical filter is applied on
the free surface for the smoothing of the wave elevation.
Good convergence has been reached for both forced motion simulations and free motion
simulations. The computed added-mass and damping coefficients, wave exciting
forces, and motion responses for ships and floating bodies are in good agreement with
the numerical results from other programs and experimental data.


identifier: Debnath, Mitu Kumar <https://research.library.mun.ca/view/creator_az/Debnath=3AMitu_Kumar=3A=3A.html>   (2015) A PHR system with policy-based fine-grained access control and revocation mechanism.  Masters thesis, Memorial University of Newfoundland.

abstract:
Collaborative sharing of information is becoming much more needed technique to
achieve complex goals in today's fast-paced tech-dominant world. Personal Health
Record (PHR) system has become a popular research area for sharing patients informa-
tion very quickly among health professionals. PHR systems store and process sensitive
information, which should have proper security mechanisms to protect patients' private
data. Thus, access control mechanisms of the PHR should be well-defined. Secondly,
PHRs should be stored in encrypted form. Cryptographic schemes offering a more
suitable solution for enforcing access policies based on user attributes are needed for
this purpose. Attribute-based encryption can resolve these problems, we propose a
patient-centric framework that protects PHRs against untrusted service providers and
malicious users. In this framework, we have used Ciphertext Policy Attribute Based
Encryption scheme as an efficient cryptographic technique, enhancing security and
privacy of the system, as well as enabling access revocation. Patients can encrypt their
PHRs and store them on untrusted storage servers. They also maintain full control
over access to their PHR data by assigning attribute-based access control to selected
data users, and revoking unauthorized users instantly. In order to evaluate our system,
we implemented CP-ABE library and web services as part of our framework. We also
developed an android application based on the framework that allows users to register
into the system, encrypt their PHR data and upload to the server, and at the same
time authorized users can download PHR data and decrypt it. Finally, we present
experimental results and performance analysis. It shows that the deployment of the
proposed system would be practical and can be applied into practice.


identifier: Curcic, Mihajlo <https://research.library.mun.ca/view/creator_az/Curcic=3AMihajlo=3A=3A.html>   (2015) Novel double-sided linear generator for the wave energy conversion.  Masters thesis, Memorial University of Newfoundland.

abstract:
The direct drive point absorber is a robust and efficient system for wave energy harvesting, where the linear generator represents the most complex part of the system. Therefore, its design and optimization are crucial tasks. The tubular shape of a linear generator’s magnetic circuit offers better permanent magnet flux encapsulation and reduction in radial forces on the translator due to its symmetry.
A double stator topology can improve the power density of the linear tubular machine. Common designs employ a set of aligned stators on each side of a translator with radially magnetized permanent magnets. Such designs require doubling the amount of permanent magnet material and lead to an increase in the cogging force. The design presented in this thesis utilizes a translator with buried axially magnetized magnets and axially shifted positioning of the two stators such that no additional magnetic material, compared to single side machine, is required. In addition to the conservation of magnetic material, a significant improvement in the cogging force occurs in the two phase topology, while the double sided three phase system produces more power at the cost of a small increase in the cogging force.
The analytical and the FEM models of the generator are described and their results compared to the experimental results. In general, the experimental results compare favourably with theoretical predictions. However, the experimentally observed permanent magnet flux leakage in the double sided machine is larger than predicted theoretically, which can be justified by the limitations in the prototype fabrication and resulting deviations from the theoretical analysis.


identifier: Alqarni, Mona <https://research.library.mun.ca/view/creator_az/Alqarni=3AMona=3A=3A.html>   (2016) Magnetic ordering in Er₂Ti₂O₇ and elastic softening in Tb₂Ti₂O₇.  Masters thesis, Memorial University of Newfoundland.

abstract:
Geometric frustration occurs in the rare earth pyrochlores due to magnetic rare earth
ions occupying the vertices of the network of corner-sharing tetrahedra. In this research,
we have two parts. In the first one we study the phase transition to the magnetically
ordered state at low temperature in the pyrochlore Er₂Ti₂O₇. The molecular
field method was used to solve this problem. In the second part, we analyse the crystal
electric field Hamiltonian for the rare earth sites. The rather large degeneracy of
the angular momentum J of the rare earth ion is lifted by the crystal electric field
due to the neighboring ions in the crystal. By rewriting the Stevens operators in
the crystal electric field Hamiltonian ᴴCEF in terms of charge quadruple operators,
we can identify unstable order parameters in ᴴCEF . These may be related to lattice
instabilities in Tb₂Ti₂O₇.


identifier: Jujuly, Muhammad Masum <https://research.library.mun.ca/view/creator_az/Jujuly=3AMuhammad_Masum=3A=3A.html>   (2016) Computational fluid dynamics (CFD) based approach to consequence assessment of accidental release of hydrocarbon during storage and transportation.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis investigated the risk of accidental release of hydrocarbons during transportation and storage. Transportation of hydrocarbons from an offshore platform to processing units through subsea pipelines involves risk of release due to pipeline leakage resulting from corrosion, plastic deformation caused by seabed shakedown or damaged by contact with drifting iceberg. The environmental impacts of hydrocarbon dispersion can be severe. Overall safety and economic concerns of pipeline leakage at subsea environment are immense. A large leak can be detected by employing conventional technology such as, radar, intelligent pigging or chemical tracer but in a remote location like subsea or arctic, a small chronic leak may be undetected for a period of time. In case of storage, an accidental release of hydrocarbon from the storage tank could lead pool fire; further it could escalate to domino effects. This chain of accidents may lead to extremely severe consequences. Analyzing past accident scenarios it is observed that more than half of the industrial domino accidents involved fire as a primary event, and some other factors for instance, wind speed and direction, fuel type and engulfment of the compound. In this thesis, a computational fluid dynamics (CFD) approach is taken to model the subsea pipeline leak and the pool fire from a storage tank. A commercial software package ANSYS FLUENT Workbench 15 is used to model the subsea pipeline leakage. The CFD simulation results of four different types of fluids showed that the static pressure and pressure gradient along the axial length of the pipeline have a sharp signature variation near the leak orifice at steady state condition. Transient simulation is performed to obtain the acoustic signature of the pipe near leak orifice. The power spectral density (PSD) of acoustic signal is strong near the leak orifice and it dissipates as the distance and orientation from the leak orifice increase. The high-pressure fluid flow generates more noise than the low-pressure fluid flow. In order to model the pool fire from the storage tank, ANSYS CFX Workbench 14 is used. The CFD results show that the wind speed has significant contribution on the behavior of pool fire and its domino effects. The radiation contours are also obtained from CFD post processing, which can be applied for risk analysis. The outcome of this study will be helpful for better understanding of the domino effects of pool fire in complex geometrical settings of process industries. The attempt to reduce and prevent risks is discussed based on the results obtained from the numerical simulations of the numerical models.