identifier: Su, Ruoyu <https://research.library.mun.ca/view/creator_az/Su=3ARuoyu=3A=3A.html>   (2015) Energy-efficient coordination schemes for underwater acoustic sensor networks.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract:
Underwater acoustic sensor networks (UWSNs) have attracted much research interest
in recent years due to the wide range of their potential applications, such as environmental
monitoring, natural resources development, and geological oceanography. While much research
effort has been devoted to the improvement of acoustic signal reception and processing,
the increase of throughput, and the reduction of packet delay, not really studies focus
on reducing and balancing energy consumption among sensor nodes in long-term marine
monitoring applications. In this dissertation, through a comprehensive understanding of
underwater acoustic channels, we propose a series of solutions to achieve energy-efficient data
transmission in UWSNs by considering both battery energies of sensor nodes and network
connectivity.
We first review different approaches to modelling the underwater acoustic channels to
obtain a comprehensive understanding of the underwater acoustic communication environment.
We propose an asynchronous wake-up scheme based on combinatorial designs to minimize the
working duty cycle of sensor nodes for UWSNs in long-term marine monitoring applications.
Network connectivity can be maintained using such a design, even with a reduced duty cycle.
We conduct simulation experiments to evaluate performance of the proposed scheme. It is
shown through our results that the proposed asynchronous wake-up scheme can effectively
reduce the energy consumption for idle listening and can outperform other cyclic difference
set (CDS)-based wake-up schemes. It is worth noting that all these are achieved without sacrificing the network connectivity among sensor nodes.
We investigate the deployment strategy of UWSNs with a square grid topology to
balance the network robustness and the energy consumption of sensor nodes. We propose
a relay node selection scheme for such network applications. We evaluate its performance
in different network sizes and using different initial battery energy to balance the network
lifetime. Simulation results show that the proposed relay node selection scheme can effectively
balance and prolong the network lifetime. Compared to routing algorithms solely based
on the minimum hops, the performance of the proposed scheme is closer to the optimal
theoretical value obtained by solving the linear programming problem. The network lifetime
is further increased if sensor nodes are allowed to have different initial energy values based
on their traffic load conditions.
Finally, we propose an effective coordination scheme for data collection when an autonomous
underwater vehicle (AUV) is used as a mobile data sink in UWSNs. We demonstrate the
effectiveness of the proposed scheme when time synchronization is not available between the
AUV and the sensor nodes. Based on the features available in existing acoustic modems,
we introduce transmitting power control to further reduce energy consumption. Simulation
results show that the proposed scheme with power control leads to lower energy consumption
than without power control during underwater communication.
The proposed schemes have been demonstrated to work well for underwater networks
with a square grid topology. It can be also extended for other network topologies and more
sophisticated modems.


identifier: Rajendran, Saravana Kumar <https://research.library.mun.ca/view/creator_az/Rajendran=3ASaravana_Kumar=3A=3A.html>   (2015) Power system performance enhancement using flexible AC transmission system devices.  Masters thesis, Memorial University of Newfoundland.

type: Thesis NonPeerReviewed

abstract:
The objective of this research is to investigate the performance enhancement of a power
system using Flexible AC Transmission System (FACTS) devices. It is intended to show
how the reliability and performance of the power system is improved. The focus is to
enhance the understanding of the system operating with and without these devices.
Power transmission can always be improved by upgrading or adding new transmission
circuits. But this is not a practical solution. FACTS devices are feasible alternatives for
optimizing the transmission systems. Providing reactive shunt compensation with shuntconnected
capacitors and reactors is a well-established technique to get a better voltage
profile in a power system. Shunt capacitors lack dynamic capabilities, and so dynamically
controlled reactive power compensation is essential. This feature is provided by FACTS
devices. Implementation of new equipment consisting high power electronics based
technologies such as FACTS becomes essential for improvement of operation and control
of power systems.
FACTS promote the use of static controllers to enhance the controllability and increase the
power transfer capability. Three software tools were used in this thesis, such as, MATLAB,
PSCAD and PowerWorld. Thyristor Controlled Reactors (TCR), Thyristor Controlled
Series Capacitors (TCSC), Static Var Compensators (SVC) are used as FACTS devices for
consideration in the power system study. This thesis aims at examining the ability of
FACTS devices and distributed FACTS devices for power flow control and reactive power
compensation in a power system.


identifier: Men, Xiaoqian <https://research.library.mun.ca/view/creator_az/Men=3AXiaoqian=3A=3A.html>   (2015) Particle simulation using serial, GPU and distributed approaches.  Masters thesis, Memorial University of Newfoundland.

abstract:
In computer engineering, simulation is a popular and reasonable method to study
scientific problems, which evaluates the motion of different objects in various sizes of
simulation spaces. In order to achieve better performance, different approaches will
be applied. Nowadays, both GPU and cluster show great power in parallel computing.
In this thesis, a particle simulation is formulated by following the motion of interacting
particles as they move in some constrained space, colliding with each other
and the walls. We compare three solutions to this problem: i) using traditional (serial)
computing, ii) using general purpose computing on a graphics processing card
(GPGPU), and iii) using a distributed cluster architecture and the message passing
interface (MPI). Based on the experimental data gathered from the tests, the performance
of the algorithms is analyzed to show how the speedup varies across different
architectures and with the number of compute cores used.


identifier: Dalton, Alan <https://research.library.mun.ca/view/creator_az/Dalton=3AAlan=3A=3A.html>   (2015) Effect of simulated freefall lifeboat training on launch skill acquisition.  Masters thesis, Memorial University of Newfoundland.

abstract:
Freefall lifeboats (FFLB) are used worldwide as a means for evacuation and escape. Currently, FFLB launch training is normally restricted to benign weather conditions due to the inherent risk to personnel safety and asset integrity. Under such circumstances, the coxswain cannot develop the heuristic techniques necessary for launching under more likely dangerous and unpredictable evacuation and environmental conditions. Simulators can provide enhanced training opportunities for these conditions, so long as the simulation technologies and training paradigms address the contextual, mathematical and behavior demands of the physical training. A high level of fidelity should invoke a level of participant presence suitable for performance-based learning and training objectives. The purpose of this research was to determine the effect of post-launch feedback on the rate of skill acquisition of novice participants performing simulated FFLB launches. Participants in two independent groups each went through 24 consecutive simulated launches under varying sea-states and visual conditions. One group was given pictorial feedback about the quality of each launch. The rate of skill acquisition and time to launch of this group was compared to a group that had no feedback.
Results show that: pictorial feedback did not affect launch success or time to launch of our FFLB launching trials, wave height had the greatest affect on launch success, visual clarity only had a significant affect on launch time in the no feedback group, and sense of presence was not affected by the inclusion of feedback or correlated to performance measures.


identifier: Buchanan, Angela L. <https://research.library.mun.ca/view/creator_az/Buchanan=3AAngela_L=2E=3A=3A.html>   (2015) Timing and evolution of metasomatic alteration and mineralization in the Lyon Mountain Granite and related iron oxide apatite (IOA) ores; constraints from apatite and titanite U-Pb geochronology, Sm-Nd isotopes and trace-elements.  Masters thesis, Memorial University of Newfoundland.

abstract:
The Lyon Mountain granite (LMG) in the northeastern Adirondack Mountains of New York State hosts numerous low-titanium iron oxide apatite (IOA) ore deposits, with most deposits containing apatite that has unusually high rare earth element (REE) concentrations (total lanthanides > 20 wt. %, and up to 8 wt. % Y) as does titanite from the metasomatically altered host rocks (total lanthanides up to 3.4 wt. %, and up to 1.4 wt. % Y). The ores are predominately hosted by perthitic granite, which has been extensively metasomatised to albite and microcline granite by Na- and K-bearing hydrothermal fluids.
To better understand the timing and evolution of the metasomatism and subsequent mineralization, and to develop a genetic model for the formation of REE-IOA deposits, U-Pb isotope dilution thermal ionization mass spectrometry (ID-TIMS) dating of apatite and titanite, laser ablation multi collector inductively coupled plasma mass spectrometry (LA-MC-ICPMS) Sm-Nd analyses of apatite and titanite from the ore and host rocks and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb zircon geochronology were combined with LA-MC-ICPMS Lu-Hf isotope measurements. In addition to field and petrologic observations and newly obtained major- and trace-element data for rock forming and accessory minerals present in the ores and hosts, this integrated dataset indicates a multi-stage protracted history for the origin of these enigmatic deposits. U-Pb ID-TIMS dates of apatite and titanite show that these minerals formed during a later fluid event, likely the same event which formed the LMG ores and the initial Nd isotopic composition of both ore and host-rock apatite, and host-rock titanite, suggests a local source for the REE.


identifier: Kaur, Jaspreet <https://research.library.mun.ca/view/creator_az/Kaur=3AJaspreet=3A=3A.html>   (2015) Perspectives, issues and concerns of immigrant parents about the education of their children in the K-12 school system in Newfoundland and Labrador.  Masters thesis, Memorial University of Newfoundland.

abstract:
This qualitative study examines the issues, concerns and perceptions of immigrant parents about the education of their children in the K-12 school system in Canada. The researcher spent six weeks interviewing immigrant parents living in St John's, Newfoundland who had children going to school in the K-12 public school system.
The interview data collected was subjected to qualitative analysis and yielded a number of emergent categories and themes. The study was driven by the general research question: What are the perceptions, issues and concerns of immigrant parents about the education of their children in the K-12 school system in Newfoundland, Canada? The following were the subsidiary research questions:
• How do the immigrant parents perceive the education their children are getting in K-12 in St. John's?
• What support systems are made available to these parents by the schools?
• What is the extent of immigrant parent involvement in schools and how can it be maintained or improved?
• How can the information about views and concerns of immigrant parents be used for the betterment of the education system in Newfoundland?
The study found that immigrant parents had various issues and concerns about the education system in Newfoundland. The study's findings include a discussion of immigrant parental involvement, support available to them within the school system and the suggestions given by them. The findings are valuable for other stakeholders in the education system to consider and take adequate steps to address the problems faced by these parents and their children.


identifier: Zheng, Jiahao <https://research.library.mun.ca/view/creator_az/Zheng=3AJiahao=3A=3A.html>   (2015) Fatigue estimation of drill-string and drill-pipe threaded connection subjected to random loadings.  Masters thesis, Memorial University of Newfoundland.

abstract:
Drill-strings are slender structures used to drill the oil-well in searching for oil and
gas. Failures of drill-strings cause the loss of time and money and therefore predicting
fatigue damage induced by vibrations is of benefit. In this thesis, fatigue calculation
of drill-strings is conducted in both time domain and frequency domain, considering
axial and torsional vibrations.
In time domain analysis, the stress time histories at any specific location of the drillstring
are obtained from a finite element model. Both deterministic and random
excitations are taken into account. Then using a rainflow counting method, the damaging
stress cycles are extracted. Based on the linear cumulative damage law, fatigue
damage is then calculated and fatigue life of the drill-string is therefore predicted.
Results under both deterministic and random excitations are compared against each
other.
Time domain fatigue analysis gives accurate predictions at the cost of long calculating
time. For the sake of time-saving, a method in frequency domain is developed.
The drill-string vibration model is built using continuous parameter method. Power
spectral densities (PSD) of the random excitation are assumed. In the process to gain
expected damage, equivalent stress spectra are calculated based on Mocha’s random fatigue failure criterion. Then the expected fatigue damage and predicted life are
estimated by a spectral method: Dirlik’s method.
Further, the drill-pipe threaded connection, which is used to connect numerous drillpipes
collars to form a drill-string, is investigated. With the help of ANSYS workbench
15.0, a standard 4.5” API line pipe threaded connection model is built. Random
excitation is considered mainly due to the unevenness of rock formation being drilled.
Firstly, a static stress analysis is conducted considering "make-up" and "tensile load"
steps. Then modal analysis and random vibration analysis are conducted, assuming
acceleration PSD as input. Finally, based on three-band technique, the fatigue damage
is calculated.
Computer simulations are run and results are given by the above three fatigue damage
calculation methods. Results show the critical positions of both the drill-string and
the threaded connection, where attention should be paid to by the manufacturers and
the drilling operators.
Although some limitations exist, this thesis proposed two ways to evaluate fatigue
damage of a drill-string. The threaded pipe connection, which is a complex structure,
is also analyzed. Further research work will aim at the validation of the simulations.


identifier: Moore, Marcus A. <https://research.library.mun.ca/view/creator_az/Moore=3AMarcus_A=2E=3A=3A.html>   (2015) Manipulation of Streptomyces clavuligerus for the purification of δ-(L-α-aminoadipyl)-L-cysteinyl-D-valine synthetase and the mobilization of plasmid DNA.  Masters thesis, Memorial University of Newfoundland.

abstract: Streptomyces clavuligerus is a filamentous bacterium renowned for its production of medicinally relevant natural products such as cephamycin C and clavulanic acid. Genome sequencing of this organism has revealed a treasure trove of cryptic/silent pathways, including a large linear plasmid with numerous secondary metabolite (SM) gene clusters. This research sought to transfer the S. clavuligerus megaplasmid (pSCL4) to a SM overproducing “super” strain, Streptomyces coelicolor (M1154), for the purpose of activating putative cryptic gene clusters encoded by it. Furthermore, synthetic constructs were designed for the overexpression and purification of mega-enzymes involved in producing important antibiotics in Streptomyces spp. The nonribosomal peptide synthetase, δ-(L-α-aminoadipyl)-L-cysteinyl-D-valine Synthetase (ACVS), is a core enzyme in the biosynthesis of bacterial cephalosporins and penicillins. ACVS was fused to a 8 His-tag and expressed using the constitutive ermEp* promoter and was purified using nickel affinity chromatography. Reported here is the first targeted isolation of ACVS and the tools developed in this study can be applied to a variety of enzymes and SM gene clusters.


identifier: Shuva, Amitesh Saha <https://research.library.mun.ca/view/creator_az/Shuva=3AAmitesh_Saha=3A=3A.html>   (2015) The graph reconstruction conjecture: some new results and observations.  Masters thesis, Memorial University of Newfoundland.

abstract:
A vertex-deleted subgraph (or simply a card) of graph G is an induced subgraph
of G containing all but one of its vertices. The deck of G is the multiset
of its cards. One of the best-known unanswered questions of graph theory
asks whether G can be reconstructed in a unique way (up to isomorphism)
from its deck. The likely positive answer to this question is known as the
Reconstruction Conjecture.
In the first part of the thesis two basic equivalence relations are considered
on the set of vertices of the graph G to be reconstructed. The one is card
equivalence, better known as removal equivalence, by which two vertices are
equivalent if their removal results in isomorphic cards. The other equivalence
is similarity, also called automorphism equivalence. Two vertices u and v
are automorphism-equivalent (similar) if there exists an automorphism of G
taking u to v. These relations are analyzed on various examples with special
attention to vertices that are card-equivalent but not similar. Such vertices
are called pseudo-similar, and they have been studied very extensively in the
literature. The first result of the thesis is a structural characterization of
card equivalence in terms of automorphism equivalence. A similar result was
obtained by Godsil and Kocay in 1982 on the characterization of pseudosimilar
vertices, which result is proved in the thesis as a corollary to the
characterization theorem on card equivalence.
In the second part of the thesis, the concept of relative degree-sequence
is introduced for subgraphs of a graph G. By “relative” it is meant that each
degree in the degree-sequence of the subgraph is coupled up with the original
degree of the corresponding vertex in G. A new conjecture is formulated,
which says that G is uniquely determined (up to isomorphism) by the multiset
of the relative degree-sequences of its induced subgraphs. The new conjecture
is then related to the Reconstruction Conjecture in a natural way.
The third part of the thesis contains an original new result on graph
reconstruction. Card-minimal graphs are investigated, the deck of which is
a set. Thus, the deck of such graphs is free from duplicate cards. It is shown
that every card-minimal graph G is reconstructible, provided that G does
not have pseudo-similar couples of vertices. This condition is recognizable,
that is, it can be checked by looking at the deck of G only.
The results of this thesis have been partially published in [1].


identifier: Chechak, Derek <https://research.library.mun.ca/view/creator_az/Chechak=3ADerek=3A=3A.html>   (2015) Professional dissonance as a predictor of job dissatisfaction and psychological distress among social work professionals: a cumulative risk model.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: In this doctoral dissertation study, the concept of professional dissonance posits that job dissatisfaction and psychological distress can result from the cumulative effect of competing, often contradictory, work demands and role obligations. Social workers, as individuals, professionals, and members of the broader society can experience dissonance resulting from identity traits, value system conflicts, and extracurricular social roles. A conceptual model of professional dissonance is presented, demonstrating potential sources of dissonance across personal-professional, moral-ethical, organizational-structural, and historical-pedagogical domains as they apply to social work theory and practice. To explore this conceptual model, a mixed method but primarily quantitative study was undertaken with a random sample of 261 registered social workers in Ontario, Canada. The cumulative risk model was used as the study framework given its prior usage in the social services and suitability to the research question. In addition to univariate and bivariate analyses, a multivariate model was developed and tested as an explanatory framework for the observed relationships between variables. A negative linear relationship was demonstrated between professional dissonance and job satisfaction and job satisfaction and psychological distress, and a positive relationship was noted between professional dissonance and psychological distress. Informed by these findings,  implications for social work practice, career choice, education, and regulation and leadership, as well as recommendations for future inquiry are discussed.


identifier: Whelan, Liam David <https://research.library.mun.ca/view/creator_az/Whelan=3ALiam_David=3A=3A.html>   (2015) Determining the electronic properties of surface enhanced raman spectroscopy substrates.  Masters thesis, Memorial University of Newfoundland.

abstract:
Surface Enhanced Raman Spectroscopy (SERS) is an ultra-sensitive technique for
optical detection of target analytes. Our work focuses on detecting oil in water using
SERS, with this thesis using phenanthrene as a model compound. SERS is a technique
which takes advantage of the optical properties of metal substrates to greatly increase
the intensities of adsorbed analytes’ vibrational modes. The rapid development of
novel materials as SERS active substrates requires an efficient screening method.
SERS Enhancement Factor (EF) does correlate somewhat with surface morphology
and UV-Vis absorption, however we present a technique which shows an even stronger
correlation and is ultimately a better screening tool: Kelvin Probe Force Microscopy
(KPFM). This technique maps the electronic properties of a substrate to its surface
morphology. This thesis covers two classes of SERS substrates: annealed bimetallic
systems and nanosphere patterned mono- and bimetallic systems. The ability to
directly map the electronic properties of a substrate to its morphological properties
is of critical importance in determining a key link between the macroscale SERS
sensor response and the microscale substrate structure. Our major findings indicate
that when Au/Cr nanostructured films’ work function is near the calculated and
experimental values for the HOMO-LUMO gap of the target analyte, phenanthrene,
the observed SERS intensity reaches a maximum.


identifier: Alarabi, Faisal <https://research.library.mun.ca/view/creator_az/Alarabi=3AFaisal=3A=3A.html>   (2015) Tandem mass spectrometric analysis of bacterial lipid A of Aeromonas Salmonicida (SJ-112).  Masters thesis, Memorial University of Newfoundland.

abstract:
This study will present an interpretation of the mass spectrometry gas-phase fragmentation patterns of the extracted Lipid A that is obtained from the native LPS extracts isolated from the marine Gram-negative bacteria Aeromonas Salmonicida (SJ-112). It is known that the surface antigen lipopolysaccarides (LPS) SJ-112 infect various fish species (Atlantic salmon and cod) which are cultivated in aquaculture ventures. The exact molecular structure of the Lipid A has not yet been precisely established.
This thesis will present the mass spectrometric fingerprint identification and structural elucidation of the Lipid A from A. Salmonicida, which are carried out by using mass spectrometry techniques namely, electrospray ionization tandem mass spectrometry (ESI-MS/MS) using an FT-ICR instrument and matrix assisted laser desorption ionization tandem mass spectrometry (MALDI-MS/MS) using a TOF/TOF instrument.
The concomitant uses of high-energy (CID-MS/MS) and low-energy collision induced dissociation (CID-MS/MS) analysis were also used to elucidate the MS/MS fingerprints of this complex biomolecule and can be effectively used for any quantitative or qualitative studies.


identifier: MacDonald, Lucy <https://research.library.mun.ca/view/creator_az/MacDonald=3ALucy=3A=3A.html>   (2015) Who are they and where are they going? Examining the emerging norms of the international "climate refugee" in New Zealand.  Masters thesis, Memorial University of Newfoundland.

abstract: Climate change induced migration is the displacement of people due to the effects of anthropogenic climate change, and it is predicted that there will be between hundreds of thousands to millions affected worldwide. Yet, it is not yet known whom these people “are.” Are they “climate migrants,” “climate refugees,” or something else? Does it matter what we call them, legally and normatively? Using a constructivist approach, New Zealand’s recent experiences with two of the first climate change related immigration cases are examined. The findings indicate that legally, “climate refugees” do not exist in domestic or international law, and that a protection gap exists. Additionally, using discourse analysis, it was found that the “climate refugee” is an accepted frame by the New Zealand public, likely due to shared normative understandings grounded in human rights. The results point to the need for a standardized language and normative international framework in order to move forward with protection measures.


identifier: Crockwell, Jim <https://research.library.mun.ca/view/creator_az/Crockwell=3AJim=3A=3A.html>   (2015) The capacity challenges of nonprofit, community-based organizations.  Masters thesis, Memorial University of Newfoundland.

abstract: This mixed method case study explored the capacity challenges of neighbourhood based community centres related to the areas of governance and leadership, program delivery, financial management and human resources. The study involved the examination of three community centres with multi-mandates (i.e., provide programs and services to individuals from pre-school to seniors in the areas of social, educational, recreational and health) and utilized three phases of data collection: 1) surveys with board members; 2) focus groups with all boards and staff; and 3) document review which examined pertinent organizational policies and procedures. Questions were aimed at gaining an understanding of some of the challenges faced by staff and administrators of neighbourhood based community centres, as there a gap in the research in this particular area. Research findings identified a number of related challenges facing non-profit organizations specifically in the areas of funding and staffing and how these challenges impact both day to day operations and longer term sustainability. More research is needed with nonprofit organizations that have these broader mandates and diverse operational challenges, hence greater capacity building challenges.


identifier: Mao, Chunxia <https://research.library.mun.ca/view/creator_az/Mao=3AChunxia=3A=3A.html>   (2015) Competitive biosorption of Ag(I) and Cu (II) by tripolyphosphate crosslinked chitosan beads.  Masters thesis, Memorial University of Newfoundland.

abstract:
In this study, alkalization of chitosan before crosslinking was applied in to enhance the
adsorption capacity of the modified chitosan. Competitive adsorption of Ag (I) and Cu (II)
from bimetallic solutions was studied using the newly synthesized tripolyphosphate
crosslinked chitosan beads. Results indicated that alkalization before crosslinking helps
to protect free-amine groups from crosslinking and hence increases the uptake capacity
and selectively of the synthesized beads towards Ag (I). The maximum uptakes of Ag (I)
and Cu (II) were 82.9 and 15.5 mg/g respectively at room temperature with an initial
concentration of each metal being 2.0 mmol/L and the sorbent dosage of 1.0 g L⁻¹.
Langmuir isotherm and pseudo-second order kinetic model provide better descriptions of
adsorption isotherm and kinetics of metal ions on sorbent surfaces. Analyses from FT-IR
and XPS confirmed that free amine, hydroxyl and P₃O₁₀⁵⁻ groups are involved in metal
binding with amine and hydroxyl groups more selective to Ag (I).
Then, continuous adsorption with the newly synthesized chitosan beads was simulated
using the lumped kinetic model. According to the parameters obtained in the batch
adsorption, the overall mass-transfer coefficient (Kf), and axial dispersion coefficient (DL)
were determined using the empirical correlations. The value of Kf for Ag (I) is in the
range of 5.028×10⁻⁵ s⁻1 to 8.389×10⁻⁵ s⁻¹, the value of Kf for Cu (II) was in the range of
8.000×10⁻⁵ s⁻¹ to 1.283×10⁻⁴ s⁻¹; The range of axial dispersion coefficient for Ag (I) and
Cu (II) were both varying from 1.806×10⁻⁴ cm²/s to 1.778×10⁻⁴ cm²/s. Results from the
breakthrough and elution profiles indicated that decreasing the flow rate, sample concentration and injection time, or increasing the bed length could enhance the
separation of the two metal ions. Besides, it was found that concentration overload by
increasing the sample concentration is more effective to improve the separation of two
metal ions in fixed-bed column than volume overload by increasing the injection time.
In conclusion, the newly synthesized chitosan-based biosorbents showed great selective
adsorption for Ag (I) in bimetallic solutions, and the simulation studies provided good
potential in industrial applications to recover precious metal ions from water or
wastewater.


identifier: Biswas, Rasel <https://research.library.mun.ca/view/creator_az/Biswas=3ARasel=3A=3A.html>   (2015) Evaluating conditional density estimation networks as a probabilistic downscaling tool: application to precipitation in Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract:
The objective of this research is to better quantify the distribution of extreme precipitation
within Newfoundland, for the current climate conditions. The province of
Newfoundland is interested in this information as guidance for climate adaptation
and longterm infrastructure planning purposes. Extreme analyses are commonly limited
by short periods of observation (often only 30 years or less), resulting in large
uncertainty regarding rare events. These limitations can be addressed by increasing
the period of observation, or partially addressed using synthetic time series generated
by stochastic weather generators. These weather generators attempt to replicate
relevant statistics of the observed climate, using various statistical modelling tools.
Here, a probabilistic neural network-based downscaling method is used to predict the
probability distribution of precipitation at a study site conditional upon the synoptic
state of the atmosphere; that is, features of a given day’s large-scale atmospheric
state are used to estimate the likelihood of all possible precipitation amounts for that
day. My results show that CDEN-based probabilistic downscaling generally agrees
better with observations than uncorrected reanalysis-based precipitation estimates.
However, it gives significantly higher estimates for extreme events at low frequency
(e.g., 100 year return periods). This approach is demonstrated for St. John’s airport.
Comparison with nearby stations, Windsor Lake, suggests that these higher estimates
may be reasonable; however, further work and a longer observational record is needed to determine whether these estimates represent added value to the raw observational
record or a shortcoming of our CDEN-based methodology.


identifier: Stevenson, Jonathan D. <https://research.library.mun.ca/view/creator_az/Stevenson=3AJonathan_D=2E=3A=3A.html>   (2015) Assessment of the equivalent level of safety requirements for small unmanned aerial vehicles.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The research described in this thesis was a concentrated effort to assess the Equivalent Level of Safety (ELOS) of small Unmanned Aerial Vehicles (UAVs), in terms of the requirements needed for the small UAV to be considered at least as safe as equivalent manned aircraft operating in the same airspace. However, the concept of ELOS is often quoted without any scientific basis, or without proof that manned aircraft themselves could be considered safe. This is especially true when the recognized limitations of the see-and-avoid principle is considered, which has led to tragic consequences over the past several decades. The primary contribution of this research is an initial attempt to establish quantifiable standards related to the ELOS of small UAVs in non-segregated airspace. A secondary contribution is the development of an improved method for automatically testing Detect, Sense and Avoid (DSA) systems through the use of two UAVs flying a synchronized aerial maneuver algorithm.


identifier: Alsafar, Teeba <https://research.library.mun.ca/view/creator_az/Alsafar=3ATeeba=3A=3A.html>   (2015) The influence of a peer mentor program for international students on domestic peer mentors and their intercultural development.  Masters thesis, Memorial University of Newfoundland.

abstract: In this study, a mixed method approach was used to examine the experience of 43 domestic peer mentors who participated in a peer mentoring program for international students offered at Memorial University of Newfoundland, St. John’s, Canada. The study aimed to answer the following questions: 1) does participating in a mentorship program for international students result in change in the intercultural development for domestic peer mentors as measured by the Intercultural Development Inventory (IDI)? 2) what were the experiences of domestic peer mentors participating in a peer mentoring program for international students? Following the Developmental Model of Intercultural Sensitivity (Bennett, 1998) as a guide, this study used the scores from the Intercultural Development Inventory (IDI) to gain an understanding of the influence of the program. The scores obtained pre and post mentorship experiences were compared and a significant difference was found. Reflections from 120 monthly reports and seven individual semi-structured interviews were also conducted to gain a deeper understanding of the mentorship experience and the influence it had on the mentors’ intercultural development. The benefits of intercultural peer mentoring on student development of skills such as leadership, communication and empathy are also discussed. The study echoes previous research that calls for an increased amount of facilitated intercultural program within university campuses. The study also advocates for further implementation of programs that provide opportunities for intercultural learning between domestic and international students in order for intercultural development to improve in higher educational settings.


identifier: Wu, Zhong <https://research.library.mun.ca/view/creator_az/Wu=3AZhong=3A=3A.html>   (2015) Effects of normal pressure and velocity on ice-ice friction.  Masters thesis, Memorial University of Newfoundland.

abstract: Improved knowledge of ice friction influences on vessels and offshore structures is desirable when we seek to optimize designs by reducing the forces applied by impinging ice. Friction is known to be important in terms of the overall load experienced by ships or offshore structures. This includes both the direct friction between ice and structure and the friction between ice pieces themselves as they move around the structure. Traditionally, a friction coefficient is considered to be independent of velocity, pressure and temperature; however, the friction of ice has been widely studied and is known to be highly variable. Numerous tests have been performed by researchers to investigate the friction between ice and various materials such as steel, concrete and other materials under various conditions. The result shows that ice friction coefficient is not generally constant when sliding velocity, pressure and temperature change. Much is still not known about ice’s frictional properties. Relatively few studies have considered the friction of ice on ice, despite the fact that this is an important factor when considering the relative movement of pack ice when it impinges on a fixed or floating structure. The ice-ice friction influences the movement of ice pieces relative to each other as pack ice “flows” around a structure and this in turn influences the load on the structure. This study examines the effect of friction of ice against ice under relatively high pressures such as those that might be experienced during full scale interactions. The objective of the study is to quantify the effects of temperature, pressure, velocity and other parameters on the ice-ice friction coefficient.


identifier: King, Matthew <https://research.library.mun.ca/view/creator_az/King=3AMatthew=3A=3A.html>   (2015) Black, white, and blue-collar noir: a study of changing depictions of race relations in film noir.  Masters thesis, Memorial University of Newfoundland.

abstract:
This thesis examines the changing depictions of race relations between white
working-class protagonists and African-American characters in film noir from two
periods. In noirs of the 1940s and 1950s there is no evident racial tension, but in neo-noir
of the 1970s black/white racial antagonism is common. This thesis contends that the
political ideologies of classical noir filmmakers, which included sympathy for both the
working class and racial minorities, had much to do with the positive depictions of race
relations in classical film noir. The end of the studio system and financial turmoil that
followed in the 1950s and 1960s caused many changes in the American movie industry,
which led studios, for the first time, to experiment with film content and to hire new
filmmakers to make films for a differentiated audience. The racial antagonism in neonoirs
stems from three main sources: an effort by the studios to attract an urban African-
American youth audience; realistic and auto-biographic filmmaking; and an effort by
white middle-class filmmakers to both reject their own racist tendencies by a process
called reaction formation, and also to live out their racist fantasies vicariously through
white working-class film characters.


identifier: Thillayampalam, Kankayaliyan <https://research.library.mun.ca/view/creator_az/Thillayampalam=3AKankayaliyan=3A=3A.html>   (2015) Creatine synthesis and amino acid sparing in neonatal piglets.  Masters thesis, Memorial University of Newfoundland.

abstract: Arginine and methionine are indispensable amino acids in neonates and have a metabolic role in creatine synthesis as well as protein synthesis. Arginine transfers its amidino group to glycine to form guanidinoacetic acid (GAA) which is then transmethylated to creatine. Methionine is the primary methyl donor for transmethylation reactions via S-adenosylmethionine (SAM). SAM is demethylated to S-adenosylhomocysteine and transfers its methyl group to synthesize creatine, phosphatidylcholine (PC) and methylated DNA. In rapidly growing animals, the balance between requirements for growth versus those for maintenance becomes more critical as growth demands more amino acids for expansion of body protein mass as well as for the increased need for other critical metabolites. Therefore, our hypothesis is that dietary creatine and its precursor GAA can spare methionine and arginine. L-[methyl-³H] methionine was infused to measure the sparing effect of dietary creatine and GAA and to quantify the partitioning of transmethylation reactions. The fractional synthetic rate of creatine, PC, DNA and protein were measured using isotope kinetics. Creatine supplementation increased the availability of methyl groups for other transmethylation reactions by reducing the labile methyl groups needed for creatine synthesis. GAA supplementation increased hepatic creatine levels 5-fold, but only when methionine was not limited. Excess dietary methionine enhanced PC synthesis by double but not hepatic protein synthesis. Sparing methionine with creatine or supplementing methionine did not increase hepatic protein synthesis, suggesting that hepatic protein synthesis is conserved in neonates when methionine is limiting. Therefore, creatine levels in neonatal piglets can be maintained only when the supply of methyl groups is expanded in the diet.


identifier: Moayedi, Mahsa <https://research.library.mun.ca/view/creator_az/Moayedi=3AMahsa=3A=3A.html>   (2015) An experimental study on surfactant-alternating-gas process.  Masters thesis, Memorial University of Newfoundland.

abstract:
Foam, produced during surfactant enhanced water-alternating-gas (SAG) injection, reduces the mobility ratio by increasing the displacement fluid (gas) viscosity; furthermore, it can block high permeability zones leading to increased recovery efficiency. This study presents a comparative laboratory study of two nonionic surfactants (Ivey-Sol 108 and TX-100) in a series of SAG coreflooding tests. The effects of surfactant type, concentration, brine salinity, injection scheme and the addition of a sacrificial adsorption agent to the secondary waterflooding on oil recovery were evaluated. Several foam stability measurement tests using dynamic and static methods were conducted to examine the foam stability of the different solutions that were used in coreflooding tests. Two main mechanisms behind the use of surfactants to enhance oil recovery are (1) reduction in interfacial tension and (2) alteration of wettability. Both the interfacial tension and contact angle of the surfactant solution and rock used in coreflooding were also characterized at experimental conditions to examine their effect on oil recovery.
It was found that optimized SAG experiment improved the total oil recovery by 13% compared to the water-alternating-gas (WAG) experiment and TX-100 is superior to Ivey-sol 108 for reducing the interfacial tension (IFT), producing foam, altering wettability toward intermediate and improving recovery. More stable and stronger foam can be generated by using low salinity brine and concentrations of surfactant above critical micelle concentration (CMC); furthermore, recovery of oil increased using low salinity solutions and higher concentrations of surfactants. The addition of sodium lignosulfonate (SLS) to the secondary waterflooding can prevent surfactant adsorption onto the rock surface, therefore maintaining a higher concentration of surfactant, leading to increased oil recovery.


identifier: Bradley, David Gordon <https://research.library.mun.ca/view/creator_az/Bradley=3ADavid_Gordon=3A=3A.html>   (1994) "Smugglers, schemers, scoundrels, and sleeveens:" an analysis of merchant-client relations at Bonavista, Newfoundland, 1875-1895.  Masters thesis, Memorial University of Newfoundland.

abstract:
The truck system, the principal medium of exchange between merchants and
fishing people in the outport economy of Newfoundland in the pre-confederation era,
was undoubtedly exploitative and had a pervasive influence on the society. Some of
the literature argues further, however, that in this cashless economy, truck provided
merchants with monopolistic, even despotic, control over communities, leaving
helpless fishing people inextricably bound, through indebtedness, to the system. This
thesis contends that fishing people were not entirely subjugated by truck; in fact, they
employed strategies which helped to mitigate the exploitative nature of the system
and allowed them to exercise a degree of influence over their own destinies. Thus
fishing people, especially dealers who owned their own boats and fishing premises,
and negotiated a "deal" with merchants each spring, dem onstrated an "agency" which
has often been overlooked.
This agency was revealed through analysis of individual accounts for clients
of a Bonavista firm, James Ryan, covering the years 1875-1895. Competition
amongst merchants for clients and their produce, combined with the disinclination
of fishing people to be passive or submissive victims of the system, helped to
undermine many of the stifling tendencies of truck. During the period, which saw
a particularly severe economic decline, this competition also created a complex and
hostile economic environment as well as a very stratified fishing population.
In negotiating the deal, the most successful fishers were usually able to secure favourable terms, conducting most of their business with the firm entirely on a cash
basis or having access, through their accounts at Ryan’s, to St. John’s merchants who
paid cash. Other consistent producers, who nevertheless fell into debt, also obtained
significant amounts of cash on their accounts. And the firm’s relentless quest for fish
prevented Ryan from imposing credit restrictions on others who produced little, even
if they were accumulating large debts. On the other hand, people who did not
perform adequately in Ryan’s estimation, suffered a degree of credit restriction or
were "cut off." Debts were virtually uncollectible, however, and rather than being
forced out of the formal economy, many found other suppliers. In fact, it was a well
established practise for many fishers to sell or "smuggle" portions their catch to other
suppliers in contravention of their deal with Ryan. Smuggling was widespread
because merchants, seeking fish intended for other suppliers, w ere eager participants.
Truck may have been skewed to the merchants’ advantage in most respects,
but many fishing people demonstrated sufficient agency to withstand the
shortcomings of their staple economy, harsh environment, and inequitable medium
of exchange.


identifier: Anderson, Colleen McDavid <https://research.library.mun.ca/view/creator_az/Anderson=3AColleen_McDavid=3A=3A.html>   (2002) Parents' attitudes toward pain medication, parents' perception of children's pain and parents' management of children's pain at home following day surgery or short-stay surgery.  Masters thesis, Memorial University of Newfoundland.

abstract: A descriptive correlational study was designed to investigate parents' attitudes toward medication, parents' perceptions of children's pain and parents' management of children's pain at home following day or short-stay surgery in a convenience sample of fifty-six parents and children 2 to 12 years (Mean age 5.98 years, 58.9% males). This study was a replication and extension of a study by Finley, McGrath, Forward, McNeill, and Fitzgerald (1996). Data were collected over a 5 month period using a demographic data form, Parents' Attitudes Toward Medication tool, and a postoperative diary containing a Numerical Rating Scale (NRS), Parents' Postoperative Pain Measure (PPPM), analgesic record and Parents' Comforting Activities Checklist (PCAC). --  Study findings focussed on what parents did at home on the day of surgery and on the two days following surgery to manage their children's pain. Most parents provided acetaminophen or acetaminophen with codeine but the number of doses and amount of medication given often were not adequate to manage their children's pain. The highest mean pain intensity ratings were reported by parents with children who had a tonsillectomy and adenoidectomy (T & A) or circumcision. More children were identified with clinically significant pain on the Day of Surgery with the PPPM than with the NRS. Most parents gave their children between 0 and 3 doses of medication over the three days of the study even when they perceived their children to have clinically significant pain. Parents' attitudes toward medication were neutral to slightly positive with both positive and negative responses to statements on addiction and drug abuse. In approximately six years since the study by Finley et al. (1996) was published, little appears to have changed in the pharmacological management of children's pain at home following day surgery or short-stay surgery. --  The unique part of this study included the development and use of the PCAC to document parents' nonpharmacological management and evaluation of the effectiveness of these comforting activities. Parents provided a large number (M = 20, SD 7.78) of comforting activities to manage their children's postoperative pain. Parents' intuitively selected comforting activities that were appropriate for their children's age and cognitive level of development. Presence of parents was most frequently reported activity and also rated as the most effective. Parents' mean ratings of the effectiveness of comforting activities were higher than their mean ratings of the effectiveness of medication provided to manage their children's pain. This tool is an important contribution to understanding parent's care of their children at home following surgery. --  The major implication resulting from this study is the need for nursing to recognize the responsibility placed on parents to manage their children's pain and make needed resources available to them.


identifier: Lamb, Mary Patricia <https://research.library.mun.ca/view/creator_az/Lamb=3AMary_Patricia=3A=3A.html>   (1997) Osmolality tolerance and ion channels in protoplasts of entomophthoralean fungi.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis documents the tolerance of E. maimaiga protoplasts to media with a broad range of pH levels and osmolalities. Growth curve data were statistically analyzed using a general linear model approach which utilizes the data from the entire growth curve. Although E. maimaiga grew in media ranging from pH 5.5 to 7.1, sensitivity to pH 5.5 was evident. Growth of E. maimaiga in media with osmolality levels of 250 to 400 mOsm did not show any significant differences. Further investigation of osmotic tolerance showed that this organism was capable of surviving osmolality treatments in solutions of 0 to 550 mOsm. However, a 350 to 550 mOsm range appeared optimal. The osmotolerance of E. aulicae was also determined and found to be similar to that exhibited by E. maimaiga. Further investigation is required to determine the mechanism used by these protoplasts for osmoregulation. Such a mechanism may include the activity of ion channels in the cell membrane. -- A protocol developed for patch clamping E. aulicae protoplasts is presented in this paper. An appropriate pipette solution (140 mM NaCl, 5mM KCl, 2 mM CaCl₂, 2.4 mM MgCl₂∙6H₂O, 10 mM MES, 3.8 mM glucose, 2.2 mM fructose, 29.8 mM sucrose, pH 6.2) and bath solution (140 mM NaCl, 5 mM KCl, 1 mM CaCl₂, 1.2 mM MgCl₂∙6H₂O, 10 mM MES, 3.8 mM glucose, 2.2 mM fructose, 36 mM sucrose, pH 6.2) were developed. Recording from cells 30 to 90 minutes after suspension in the bath solution using the cell-attached recording configuration and a pipette size of 20 MegaΩ resulted in low noise gigaseal recordings. -- Use of the developed patch clamping methodology resulted in the identification of outward rectifying, voltage-gated multichannel activity sensitive to membrane depolarization. Using the mean channel amplitude, the current-voltage relationship was identified as having a conductance value of 31 pS. Use of K⁺ channel blockers, TEA⁺ and Ba²⁺, caused reduced channel activity suggesting that the channels are involved in K⁺ transport. Further evidence of this classification is based on the reduced membrane conductance values obtained when elevated levels of K⁺ were present in the pipette solution. The conductance values were reduced to 10.6 pS and -20.1 pS with K⁺ concentrations of 60 and 140 mM respectively. This serves as further evidence that the voltage-gated channels in the protoplast membrane of E. aulicae are K⁺ channels.


identifier: Hu, Min <https://research.library.mun.ca/view/creator_az/Hu=3AMin=3A=3A.html>   (1993) On variable coefficient multistep methods.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: In this monograph, we develop a subclass of variable coefficient multistep (VCM) methods, which is A-contractive. -- We introduce a set of simplifying conditions to relate VCM methods to the Padé approximants of the exponential function exp(z). We then proceed with the construction of the arbitrary order, A-contractive, variable stepsize VCM methods. Both linearly implicit and fully implicit families are considered. -- The convergence properties of VCM methods are discussed in chapter 3. We show the stiff-independent convergence for VCM methods on general nonlinear dissipative problems. We also demonstrate convergence of VCM methods when applied to singular perturbation problems with the convergence being independent of the perturbation parameter. -- Finally, in chapter 4 we report on a set of numerical experiments with fourth and fifth order linearly implicit and fully implicit methods.


identifier: Luo, Dexiang <https://research.library.mun.ca/view/creator_az/Luo=3ADexiang=3A=3A.html>   (2000) Occluded object discrimination by a modified Hopfield neural network.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis presents a new method of the 2-D partially occluded object discrimination for the computer vision application. A binary modified Hopfield neural network was applied to perform the global feature matching. To obtain the feature points of the object, a Gaussian function was implemented to smooth the object boundary curve and a curvature estimation method was used to extract the dominant points. A 3-point matching method was used to perform the initial comparison and to build the disparity matrix. Finally, the coordinate transformation was used to eliminate the false matched points. Two image banks, a model object image bank and an occluded object image bank, were built for the discrimination test. The result showed that the discrimination algorithm was successful. -- Keyword: occluded object discrimination; disparity matrix; dominant points; modified Hopfield neural network; image bank; global optimization


identifier: Fraser, Gail S. <https://research.library.mun.ca/view/creator_az/Fraser=3AGail_S=2E=3A=3A.html>   (1999) Parental care and sexual selection in socially monogamous crested auklets (Aethia cristatella).  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: In this thesis I investigate the relationships between chick growth, parental attendance and sexual selection in a seabird that exhibits mutual mate choice.   I quantified breeding parameters, sexual roles in parental care and how ornamentation relates to parental care in Crested Auklets (Aethia cristatella) at Buidir Island, Alaska.   Growth rates averaged about 9.98 g/day during the linear phase and chicks fledged at an average mass of 247 g and a wing length of 124 mm at 34.5 days after hatching. Crested Auklet chicks, like those of other diurnally active auklet species, grow relatively fast and depart at a younger age compared to the chicks of two nocturnal auklet species. Parental care patterns were studied using radio telemetry.   In 1996, I found no sexual differences in parental care behaviours and low attendance rates, suggesting a poor food year.   In 1997 and 1998, I found significant differences in parental care between males and females: males attended and brooded their single chick 45% more than females, while females provisioned 47% more than males. Males have a larger and strongly hooked bill and are more aggressive than females and I hypothesized that males are better equipped than females to guard young chicks. While this bill shape difference probably evolved through intra-sexual selection, it has ecological consequences because male auklets delivered larger prey items than females. Males brought in 30% more larger euphausiids whereas females brought in 36% more smaller copepods. I examined the relationship between crest length and parental effort using simple game theory models.   I evaluated whether crest length indicated an ability to provide parental care (a direct benefit) or whether crest length advertised a indirect benefit such as good genes. Male attendance and provisioning rates were not related to crest length, however early chick provisioning by males was positively correlated with their partner's crest length. Female provisioning rates were negatively correlated with own crest length, while early attendance was positively correlated with their partner's crest length. Because both male and female parental effort was positively correlated with their partner's crest length, suggests that crest length was an advertisement of an indirect benefit.


identifier: Orchard, Phil <https://research.library.mun.ca/view/creator_az/Orchard=3APhil=3A=3A.html>   (2001) Once more unto the breach : humanitarian interventions in failed states.  Masters thesis, Memorial University of Newfoundland.

abstract: Failed and failing states are a growing concern throughout the world. These states leave the United Nations and the international community in the position of either helping or ignoring them. Unfortunately, when the UN has chosen to intervene, it has been unsuccessful in solving the state's long term problems. This thesis will examine two case studies of failed' interventions, Somalia and Haiti, and existing theoretical models in order to 1) explore the strategies available to the UN to stop complex emergencies in failed states and then to reconstruct them, and 2) propose a new humanitarian intervention framework embodying these lessons.


identifier: Weliyanto, Bobby <https://research.library.mun.ca/view/creator_az/Weliyanto=3ABobby=3A=3A.html>   (2002) On crack identification using neural networks.  Masters thesis, Memorial University of Newfoundland.

abstract: Most structures suffer fatigue damage at some point during their operational life. This damage may lead to a structural failure. An early damage identification is needed to prevent such a structural failure. A technique which depends on the measurement of the changes in the vibration characteristics of the structure can be effective, since inspection can be performed while the structure is in normal operation. This work presents a methodology for using neural networks in identifying structural damage employing the vibration signature data. -- An experimental study was carried out to measure the random response of undamaged and damaged beam models. The damage was simulated by introducing a hand-made saw cut at different points along the length of the beam. The depth of crack was also varied. Two beam models were used: one was simply supported, and the other was a fixed-fixed beam. The beam was excited using random excitation. The autocorrelation function was calculated and used as an approximation for the free vibration of the model. A neural network technique was performed to identify the crack occurrence and its extent. The results show that this technique is able to detect the occurrence of the crack.


identifier: Subramanian, Vembu <https://research.library.mun.ca/view/creator_az/Subramanian=3AVembu=3A=3A.html>   (2000) Oceanographic mesoscale features off the West Greenland coast : satellite image analysis and modelling.  Masters thesis, Memorial University of Newfoundland.

abstract: The establishment of a station to receive National Oceanic Atmospheric Administration (NOAA) satellite data at the Northwest Atlantic Fisheries Centre, St. John's, Newfoundland in 1994 greatly expanded the AVHRR coverage of the coastal waters of the Newfoundland and Labrador region to include the West and East Greenland waters. The thermal infrared imagery selected from the data received at this station provide a valuable new perspective on oceanographic phenomena occurring in the waters off the coast of West Greenland. This perspective could not be attained using conventional shipboard and in situ oceanographic measurement techniques. A rich spectrum of mesoscale oceanographic features is revealed in the analyzed thermal infrared imagery, and the spatial and temporal scales of the various features such as West Greenland Current meanders, frontal waves and eddies are described first in this thesis. Then, a three-dimensional, primitive equation, regional, ocean circulation model of the West Greenland region based on the NOAA Geophysical Fluid Dynamics Laboratory (GFDL) Modular Ocean Model (MOM2 - version 2) code is used to elucidate the dynamics involved in modelling the current meanders and eddies. First, a numerical experiment was carried out by forcing the model from rest using an idealized initial density front with a passive open boundary condition in which there is no forcing specified at the open boundary to test and verify the satisfactory behaviour of the MOM2 model. In response to the initial forcing, two baroclinic Kelvin waves were formed and the waves were found to propagate out of the model domain through the open boundaries without affecting the interior solution. Next, a numerical experiment was carried out to investigate the combined effects of wind and thermal forcings in the generation of current meanders and eddies. Results of the experiment show the development of a poleward surface current and an opposite flowing undercurrent. In time the core of the undercurrent becomes wider and seen to displace the core of the surface current, suggesting that there may be both vertical and horizontal shear. As a result the currents could become unstable, and lead to the development of current meanders and eddies.


identifier: Suciu, Floarea <https://research.library.mun.ca/view/creator_az/Suciu=3AFloarea=3A=3A.html>   (1998) Performance analysis of timed Petri nets by decomposition of the state space.  Masters thesis, Memorial University of Newfoundland.

abstract: Performance evaluation of systems is a very important part of system design. Modeling tools which allow the analysis of systems and their behaviors should also provide performance analysis of the modeled system as it is less costly to perform changes at the model level. Petri nets are becoming popular modeling tools that can represent and analyze concurrency, parallelism, synchronization, mutual exclusion and conflicts. However, time and space requirements of the classical approach of exhaustive generation of all possible behaviors of the system (or its state space) grow quickly with the size of the model. An alternative approach based on structural properties can be applied only to particular classes of nets. -- A new way to derive performance measures for timed Petri nets is based on decomposition of the state space. This is a hybrid method that uses both reachability and structural analysis. The state space of the original net is decomposed into state spaces of smaller nets, and these smaller nets are then analyzed by the reachability analysis method. Since the nets are quite simple, reachability analysis is straightforward and cannot be affected by the state explosion problem. The performance indices for smaller nets are then used for performance analysis of the original net.


identifier: Liu, Wei <https://research.library.mun.ca/view/creator_az/Liu=3AWei=3A=3A.html>   (2001) On the Kuhn-Tucker equivalence theorem and its applications to isotonic regression.  Masters thesis, Memorial University of Newfoundland.

abstract: Prior information regarding a statistical model frequently constrains the shape of the parameter set and can often be quantified by placing inequality constraints on the parameters. For example, a regression function may be nondecreasing or convex or both; or the treatment response may stochastically dominate the control. The order restricted statistical inference has been well developed since the 1950's. The isotonic regression solves many restricted maximum likelihood estimation problems. And the theory of duality (cf. Barlow and Brunk (1972)) has provided insights into new problems. Both the isotonic regression and Fenchel duality play the important roles in order restricted statistical inference. -- Kuhn and Tucker (1951) proposed a necessary and sufficient condition for the solution to an inequality constrained maximization problem. Since then, the Kuhn-Tucker equivalence theorem has been extensively applied to many fields such as optimization theory, engineering, the economy and so on. -- In this paper, we focus on the applications of the Kuhn-Tucker equivalence theorem to order restricted estimation. This equivalence theorem provides a completely different approach to prove many important results such as the generalized isotonic regression problem due to Barlow and Brunk (1972), I-projection problems due to Dykstra (1985) and so on. We provide some insights into its extensive applications to ordered statistical inference.  We expect that the kuhn-Tucker equivalence theorem will become a powerful tool in this field. -- Key words: Convex cone; Isotonic regression; Linearity space; Partial ordering; Polyhedral convex sets; Simple tree ordering; Van Eeden's algorithm.


identifier: Parnaby, Andrew <https://research.library.mun.ca/view/creator_az/Parnaby=3AAndrew=3A=3A.html>   (2001) On the hook : welfare capitalism on the Vancouver waterfront, 1919-1939.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: In 1923, after nearly three decades of class conflict on the Vancouver waterfront, the Shipping Federation of British Columbia, an umbrella organization of shipping, stevedoring, and warehousing interests, undertook a far-reaching agenda of welfare capitalism. Drawing on wider currents of progressive reform which were cresting in the interwar period, and inspired by the example set by its counterpart in Seattle, the Shipping Federation created new joint political structures, adopted a range of paternalist initiatives, and decasualized the waterfront workplace. From its vantage point, this was a "good citizens" policy, and it was designed to: build bridges across the class divide, gain greater control of the work process, stave off the intervention of unions and the state, and, in the end, mould a more efficient and compliant waterfront workforce. The creation and implementation of this reform agenda, the ways in which white and aboriginal waterfront workers negotiated the politics of paternalism and labour market reform, and the long-term ramifications of this dynamic are at the core of this thesis. -- Welfare capitalism shaped patterns of life and labour on the waterfront significant ways: informal ways of regulating the workplace atrophied; labourism was revived; and some waterfront workers acquired a reasonable standard of living. The trade-off at work, here, was this: only those employees who divested themselves of more radical political sensibilities, and adhered to waterfront employers' broader vision of an efficient, decasualized workplace, could hope to secure a living wage and fulfill their obligations as breadwinners, husbands, and  citizens. For aboriginal longshoremen, most of whom were from the Squamish First Nation, this bargain was especially difficult to negotiate for it came freighted with the additional challenges associated with being "Indian" in a white society. Unlike their white counterparts who passed muster, they were marginalized from the waterfront during this time as decasualization's new time-work discipline conflicted with their more traditional sensibilities and ongoing need to work at a variety of tasks to ensure material and cultural survival. -- Straddling labour history, aboriginal history, and the burgeoning literature on law and society, this thesis rejects conventional interpretations of welfare capitalism that conceptualize it as either a failed experiment in industrial democracy, or a drag on the emergence of the welfare state. In doing so, it re-positions welfare capitalism in the context of the wider return to normalcy following the Great War, and the powerful reform impulses that took aim at family, citizen, and nation. Rather than forestalling the welfare state, this citizen-worker complex--which manufactured a new sense of entitlement amongst white waterfront workers--was part of a broader cultural shift that would, after the trials of the Great Depression and challenge posed by the Communist Party of Canada, eventually underwrite the state's very expansion. On a broad level, then, this analysis illustrates how the prevailing liberal-capitalist order was successfully rehabilitated after the Great War and 1919, and how, in the long-term, it successfully contained, by consent and coercion, those forces which were antithetical to the prevailing economic and political status quo.


identifier: Hejazi, Ramzi Fouad <https://research.library.mun.ca/view/creator_az/Hejazi=3ARamzi_Fouad=3A=3A.html>   (2002) Oily sludge degradation study under arid conditions using a combination of landfarm and bioreactor technologies.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Landfarming is one of the disposal methods used by oil companies to dispose of their generated oily sludge. Once in the soil, the sludge is subjected to biodegradation, leaching, and volatilization. Scientific studies to understand the degradation processes and to determine the degradation rate constants were mainly conducted in North American and European laboratories. However, no field studies were conducted in an arid region such as Saudi Arabia, the largest oil producer, where more than 30.000 m³ of oily sludge is generated annually. -- Field-scale research was conducted in the Juaymah area in the Eastern Province of Saudi Arabia to study the degradation of petroleum hydrocarbons under natural and enhanced conditions using landfarm and bioreactor technologies. The site was selected on the basis of its geographical location, site hydrology and climatic conditions. Based on factorial analysis, six landfarm and three bioreactor cells (2m x 2m) were designed, constructed, and operated for one year starting September 2000 using sludge from an Arab Medium crude tank bottom. Sampling was carried out on a monthly basis and the analysis conducted at Saudi Aramco laboratories following the US EPA (United States Environmental Protection Agency) standard methods. The studied parameters included: O&G (Oil and Grease), total hydrocarbon. BTEX (Benzene, Toluene, Ethyl benzene, and Xylene), pH, n-alkanes, microorganisms, metals, nutrients, and moisture content. -- The results of this study revealed that weathering (evaporation) and not biodegradation was the dominant degradation mechanism. Of the three operating parameters (tilling, addition of water and/or addition of nutrients), tilling was the main parameter responsible for the highest percentage of reduction (76%) in the O&G concentrations. The addition of nutrients and water changed the soil properties and hence minimized the weathering effect. As demonstrated by the C₁₇/Pr and C₁₈/Ph ratios obtained from the GC-FID analysis, only those cells, which received nutrients showed evidence for biodegradation. In addition, a novel bacterial species known as Burkholderia glumae was identified, for the first time in Saudi Arabia, as one of the indigenous soil microorganisms responsible for the biodegradation. -- The new analytical method of Open System Pyrolysis was used for the first time in this study and was compared with the routine O&G method to monitor oily sludge degradation. Although the results showed a similarity between these methods, however the Open System Pyrolysis provided a rapid method for the analysis of light volatile hydrocarbons in addition to several advantages over the O&G method. -- A new model was developed to reflect a mirror image of the S-shaped curve of the collected data. The results obtained from this model exhibited a better fit (R²) than the zero-order, first-order and Monod kinetics models. The two-level factorial analysis (2k) was used for the first time in this study to evaluate the significance of tilling, water, and nutrients to the overall degradation process. -- The analytical results revealed that due to the method of air addition, the bioreactor system was not effective in achieving a high percentage of O&G reduction. The O&G reduction data indicates that natural attenuation should not be used as an on-going treatment/disposal method for oily sludges mainly because it is a very slow process. -- The risk assessment revealed that landfarm activities pose a serious onsite risk particularly at the initial three-months loading period because of the presence of carcinogenic compounds such as benzene. -- Recommendations for future research direction in the area of degradation under arid conditions are included in the thesis.


identifier: Hasler, Laurel Anne <https://research.library.mun.ca/view/creator_az/Hasler=3ALaurel_Anne=3A=3A.html>   (2002) Obviation in two Innu-aimun atanukana.  Masters thesis, Memorial University of Newfoundland.

title: Obviation in two Innu-aimun atanukana

abstract: This thesis analyzes how obviation, a grammatical structure found in Algonquian languages, is used in two Innu-aimun âtanûkana (myth-legends) told in Sheshatshiu, Labrador. Specifically, I explore the way in which obviation patterns in the two stories, and how the storyteller makes the choice of whether to assign each particular third-person referent proximate or obviative status. -- In the study, I identify seven semantic and syntactic environments in the narratives in which the storyteller generally assigns third-person referents proximate status. My study also points to exceptions to these apparent rules of proximate assignment where the storyteller will give a third person an unexpected status in order to reflect some meaning at the level of discourse, for example foreshadowing an event, placing focus on a particular character, or attributing the quality of agentivity to a particular character.


identifier: Langor, Gemma <https://research.library.mun.ca/view/creator_az/Langor=3AGemma=3A=3A.html>   (2000) Peer tutoring: what are its benefits to the tutor? : tutors' perceptions of a peer tutoring experience in nursing education.  Masters thesis, Memorial University of Newfoundland.

abstract: The purpose of this study was to gain insight into the senior nursing students' perceptions of benefits accrued as a result of their experience of 'becoming and being' peer tutors to junior students. Findings from this study could assist nurse educators in determining the value of this teaching-learning strategy in nursing education. Qualitative research using a case study approach was used for this study. Sources of data for describing students' perceptions included in-depth interviews as well as a journal kept by the researcher throughout the interview process. Loving's (1993) model of competency validation was used as a theoretical framework for this study. Four major themes revealed through data analysis were: role perception, peer tutoring as a mechanism for self-discovery, peer tutoring and mastery learning, and peer tutoring as preparation for independent practice. The exploratory nature of the study indicated that peer tutors did indeed reap many benefits from the experience. The results showed that peer tutoring in nursing education fostered personal and professional growth for all participants. Specific outcomes such as development of a sense of community through engendering respect, caring and friendship among students across varying levels of nursing, belief in one's own abilities and potentials, enhanced reasoning and problem solving skills, and enhanced articulation skills are all discussed.


identifier: Fitzpatrick, Janet M. <https://research.library.mun.ca/view/creator_az/Fitzpatrick=3AJanet_M=2E=3A=3A.html>   (1999) Patient-based outcomes : older adults' perceptions of hospital and recovery experiences.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: This descriptive-correlational prospective study was designed to investigate the hospital and recovery experiences of a sample of 430 patients¹ aged 55 years and older, admitted to medicine, surgery, cardiac care or women's health programs, in a recently restructured health system. The study investigated physical/mental health status during hospitalization and at two weeks post-discharge, and functional status at three days and two weeks post-discharge. Relationships between patient characteristics, illness-related variables, discharge planning and health/functional status were also explored. The conceptual framework for the study was based on the Medical Outcomes Study (MOS) framework (Tarlov et al., 1989). -- Most patients were married (68.2%), retired (70.8%), had someone they could turn to for help (94.4%), were 65 years of age or older (63.8%), and had highschool or post-secondary education (56.4%). There were fairly equal numbers of males (49%) and females (51%). Data were collected between January and June, 1998. -- The SF-12 Health Survey, Functional Autonomy Measurement System, Post-Hospital Questionnaire, Symptom Questionnaire, and Patient Information Questionnaire were administered during face-to-face and telephone interviews. Study findings indicated that physical health ratings were lower than mental health status prior to and post-hospitalization. With regard to functional status, limitations were noted in mobility and instrumental activities of daily living (IADL) at both time periods. A significant improvement was observed in patients' mental health status, mobility, and IADL, whereas, physical health status evidenced a significant decline. -- With regard to discharge planning indicators, most patients reported relatively high levels of understanding, confidence and satisfaction, but minimal or no participation in decision-making about care. Over 50% of patients did not receive recovery-related information, and over 75% did not receive information on community resources. Health-care providers overestimated patients' understanding of health problems, participation in decision-making about care, confidence in resuming normal activities at discharge, and satisfaction with discharge arrangements. -- Patient characteristics and illness-related variables influenced physical/mental health status at two weeks post-discharge. There was little association between discharge planning variables and health/functional status at two weeks post-discharge. -- Regression analysis identified mental health status at two weeks as the most significant predictor of physical health, and physical health status at two weeks surfaced as the most significant predictor of mental health. Functional status indicators (ADL, IADL, communication and mobility) at three days post-discharge surfaced as the most significant predictors of their counterparts at two weeks post-discharge. -- The factors affecting health and functional status are varied and complex, and require further investigation. Study findings suggest that medical/surgical patients admitted to acute-care settings are experiencing poorer physical health and improved mental health and functional status two weeks following discharge. Findings point to a need to improve provider-patient communication and to increase the opportunity for patient involvement in decision-making about care. -- ¹ The term 'patient' refers to client or consumer of health services.


identifier: Craig, J. D. C. <https://research.library.mun.ca/view/creator_az/Craig=3AJ=2E_D=2E_C=2E=3A=3A.html>   (2000) Quantum chemistry and raman spectroscopy studies of anion hydration.  Masters thesis, Memorial University of Newfoundland.

abstract: The low frequency vibrational spectra of aqueous halides and selected pseudohalides are interpreted in terms of interactions between the anions and the water. A weak band in the isotropic Raman spectrum at ca . 200 cm⁻¹ originates with the symmetric stretching mode of the A⁻···HOH species. This assignment is based on experimental studies of aqueous anions in H₂O₁ D₂O and H₂¹⁸O and calculations using a model two body harmonic oscillator comprising one water molecule and the anion. The model is shown to be consistent with quantum mechanics and ab initio molecular orbital calculations. The integrity of the model is reaffirmed at high levels of theory and the inclusion of electron correlation in the calculations. An octahedral structure is proposed to reconcile evidence of larger complexes with the observation of only one hydrogen bond on the picosecond time scale of the Raman measurement. It is conjectured that the dynamics of the A⁻ ···HOH vibration is influenced by neighbouring molecules.


identifier: Marche, Tammy Ann <https://research.library.mun.ca/view/creator_az/Marche=3ATammy_Ann=3A=3A.html>   (1993) On the resistance of preschoolers' memories to postevent misinformation.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: The primary aim of the present research was to explain the variability in findings across past studies regarding the effects postevent misinformation has on preschoolers' testimony and memory. It is argued that the appearance and disappearance of such effects is due to at least three limitations of past research. The first limitation concerns the failure to equate the degree to which original information is learned both across conditions within a study and across studies. The second concerns the failure to use analytical techniques that are sensitive to the different processes involved in retention (e.g, forgetting and reminiscence). The third limitation involves past failures to examine both the potential constructive and destructive effects that exposure to misinformation may have on testimony and memory. By addressing these limitations it was possible to determine whether exposure to postevent misinformation encourages preschoolers to report erroneous information, as well as whether, and how, misinformation affects memory for a witnessed event. It was also possible to examine the effects of providing consistent postevent information on preschoolers' testimony and memory. A recently developed model of long-term retention that eliminates the problems of differences in initial learning and analytical insensitivity is used to examine the effects of consistent and inconsistent information on testimony and memory. Preschoolers were presented with a slide sequence about a little girl anxious to attend a Halloween party. Half of the children received a single trial and the remaining half learned the material to criterion. Following acquisition, children received one of the following: (a) no postevent information; (b) correct information concerning peripheral event details three weeks after acquisition, presented in either narrative or questionnaire form; or (c) misleading information concerning peripheral event details three weeks after acquisition, presented in either questionnaire or narrative form. Four weeks following acquisition, all of the children received 4 test trials without further study opportunity. The results indicate the following: (a) exposure to misleading information encouraged preschoolers to report misinformation; (b) although the effects of misleading information on memory were rare, there were more story details unavailable for recall in one of the misled than nonmisled conditions; (c) the transient effects of misinformation on memory and testimony are likely influenced by the limitations of past studies mentioned above; (d) re-exposing preschoolers to story details that were embedded in a narrative increased recall; and (e) performance increased across test trials with the recall of original information, but it did not differ as a function of experimental manipulation. These results demonstrate that when initial learning is controlled and appropriate measurement techniques are used, the potential misinformation may have to impair memory could play a role in preschoolers' reporting of this information.


identifier: Hilliard, Chastity <https://research.library.mun.ca/view/creator_az/Hilliard=3AChastity=3A=3A.html>   (2001) Off-line thermochemolysis-gas chromatography-mass spectrometry (GC-MS) using solid-phase microextraction (SPME) - phenolic acid analysis.  Masters thesis, Memorial University of Newfoundland.

abstract: An important class of compounds within the plant and animal kingdom are phenolic acids (i.e. hydroxy I substituted benzoic acids). Traditional methods used for the determination of these compounds are very time-consuming, involving procedures that include extraction, derivatization and finally GC analysis. An alternative method, called Pyrolysis/Methylation-GC (or thermochemolysis), applies the use of a derivatizing reagent, such as tetramethylammonium hydroxide (TMAH) for direct and rapid determination of these compounds in one analytical step. The polar functional groups (i.e. carboxylic and phenolic acid groups) are rapidly methylated and the products thermally desorbed onto the GC/MS column. Most analyses are on-line, where the pyrolysis unit is directly connected to the GC. However, there are serious drawbacks to on-line technique including the introduction ofthe methylating reagent onto the column and the requirement of a dedicated GC/MS. -- This study investigated method development for off-line thermochemolysis using solid-phase microextraction (SPME) for the analysis of phenolic acids using syringic acid as a model compound. The parameters investigated included pyrolysis temperature, SPME adsorption temperature and time, fibre size/phase, and split flow required for GC. Other thermochemolysis reagents investigated were tetramethylammonium acetate (TMAAc) and N,0-bis (trimethylsilyl) trifluoroacetamide (BSTFA). The effect of the solvent (i.e. methanol and water) used to dissolve the different reagents was also investigated. It was determined that aqueous TMAH was the most suitable reagent for phenolic acid analysis. The SPME off-line method was successfully optimized for highest quantity of methylated product. It was also determined that reagents BSTFA and TMAAc did not give reproducible results due to volatility of BSTFA and the insufficient basicity of TMAAc. -- The above method was applied to the analysis of phenolic acids present in white pine needles (Pinus strobus). Although most phenolic acids were successfully methylated, it was found that the SPME step was too selective as an extraction technique, that is, the phenolic acids observed in the chromatogram were dependent on the SPME adsorption temperature during headspace analysis. Future work should be focused on the use of SPME in aqueous solution of methylated products.


identifier: Dai, Yang <https://research.library.mun.ca/view/creator_az/Dai=3AYang=3A=3A.html>   (2002) Parameters influencing generation of cryptic pathogenic T-cell epitopes in thyroglobulin.  Doctoral (PhD) thesis, Memorial University of Newfoundland.

abstract: Thyroglobulin (Tg) is a major autoantigen in autoimmune thyroiditis, a T-cell-mediated, organ-specific autoimmune disorder. Immunization with Tg or some Tg peptides can activate thyroiditogenic T cells and cause experimental autoimmune thyroiditis (EAT) in mice. Most of the identified pathogenic Tg peptides have been characterized as cryptic epitopes due to their insufficient presentation following processing of Tg in vivo and in vitro. The main goal of this study was to examine whether modification of Tg processing could enhance generation of cryptic T-cell epitopes. Two physiologically relevant parameters that could modify Tg processing were tested: the first was the formation of immune complexes (IC) of Tg with Tg-specific Abs; and the other was the increased iodination of Tg. -- It is shown that generation of the non-dominant pathogenic Tg epitope (2549-2560), containing thyroxine (T4) at position 2553 (T4(2553)), is augmented in APC that internalize ICs of Tg with selected Tg-specific IgG mAbs. The enhancing effects of certain mAbs on the generation of T4(2553) is FcR-dependent, but FcR-mediated internalization of Tg is not sufficient for generation of T4(2553). The data rather suggest a mAb effect on Tg processing within APC. Interestingly, one of Tg-specific mAbs, 55H8, suppressed the generation of T4(2553) following processing Tg-mAb ICs. The suppressive role of 55H8 on activation of T4(2553)-specific T-cells was further investigated. It was found that 55H8 can bind to the T4(2553) peptide within Ak MHC and prevent recognition of the peptide by T4(2553)-specific T-cells. These two studies indicate that Tg-specific Abs may regulate the course of AT by enhancing or suppressing activation of Tg-reactive pathogenic T-cells. It was shown that highly iodinated thyroglobulin (I-Tg) exhibits higher immunopathogenicity than normal Tg in mice. Processing of I-Tg in LNC in vivo, or in macrophages and dendritic cells, but not B cells, in vitro, promoted presentation of the cryptic pathogenic Tg peptide (2495-2511) to T cells. This study demonstrates that generation of non-iodinated, cryptic but pathogenic determinants during processing of I-Tg, may contribute to the development of AT. In conclusion, the studies describe general mechanisms as to how autoantibodies may regulate process of T-cell-mediated autoimmune diseases and how environmental factors such as excess iodine may trigger autoimmune responses.


identifier: Kendall, Riley James <https://research.library.mun.ca/view/creator_az/Kendall=3ARiley_James=3A=3A.html>   (1984) An investigation into the effects of selected factors on student success in the business education and heavy equipment operation programs at the Bay St. George Community College.  Masters thesis, Memorial University of Newfoundland.

abstract: The aim of this study was to determine what effects selected factors had oh the successful performance of students in Business Education and Heavy Equipment Operation programs at the Bay St. George Community College in Stephenville, Newfoundland. The primary question to be investigated was-whether the route by which students obtained their entry requirements was significant or not. -- The three groups of students in question where those who came: (1) direct from public school, (2) through Basic Training for Skill Development (BTSD) without Basic Literacy, and (3) through BTSD with Basic Literacy. Students in the Heavy Equipment Operation program came through all three routes whereas students in Business Education came through routes one and two only. The overall performances of these three groups were compared, using four selected factors: route of entry, age, prior experience, and accommodations. -- The information for this study was extracted from the student files at the Bay St. George Community College. The sample was based on the,11-year period from 1973 to 1983. A standardized method of calculating performance scores was devised to ensure that a uniform system of recording data was used for both programs. -- In the data analyses each factor was tested against overall performance of the students in each of the programs. A significant relationship was found between route of entry and student performance in Heavy Equipment Operation but all other analyses indicated insignificant relationships. However, in Business Education the experience factor, although not related significantly to performance, indicated that a weak relationship may exist between lack of experience and low performance.


identifier: Zeid, Saad Muftah <https://research.library.mun.ca/view/creator_az/Zeid=3ASaad_Muftah=3A=3A.html>   (1998) An analysis of permanent magnet synchronous motor drive.  Masters thesis, Memorial University of Newfoundland.

abstract: Permanent magnet (PM) excited synchronous machines have shown increasing popularity in recent years for the industrial drive applications due to the recent developments in magnetic materials, power converters, and digital signal processors. The control of a high performance permanent magnet synchronous motor drive for general industrial application has received wide spread interest of the researchers. Interior permanent magnet synchronous motor drives are widely used in high performance applications. In these applications, the drive speed should follow accurately a certain command trajectory and recover from sudden load disturbances very fast. The precise control of the permanent magnet synchronous motor is necessary where the dynamic responses greatly affect the quality of the products. -- In this thesis, a complete permanent magnet synchronous motor (PMSM) drive system fed by a PWM voltage source inverter is developed. The design of multi-loop control for the interior permanent magnet synchronous motor drive for high performance application is introduced. Speed controller using synchronous reference frame proportional integral (PI) regulator is employed as an outer loop. Moreover, two synchronous frame PI regulators are employed as inner loops to control the direct and quadrature axis current components of the motor. Implementation of the current controllers in the synchronous reference frame ensures independency of the controllers on the cross coupling between the d-q axis and gives superior performance. The controllers are based on the indirect field oriented control. A systematic mathematical formulation is presented for designing motor controllers. The control scheme is implemented using a high speed digital signal processor (DSP). The experimental results validate the theoretically simulated speed responses with different dynamic operating conditions. These results illustrated the efficacy of the proposed multi-loop control of the PMSM drive.


identifier: Evans, Nicola S. <https://research.library.mun.ca/view/creator_az/Evans=3ANicola_S=2E=3A=3A.html>   (2002) An investigation of the Holocene pollen record from the Grey Islands, Newfoundland.  Masters thesis, Memorial University of Newfoundland.

abstract: An 800 cm core from a lake (104 m; 50°46.08'N, 55°31'W) on the Grey Islands, situated in the Labrador Sea 20 km east of Newfoundland's Northern Peninsula, provides a nearly complete Holocene pollen sequence with a distinct maritime influence. By 9800 BP (705 cm), the site had emerged from the postglacial Daly Sea and a herb-shrub tundra was established. Tundra persisted until 7800 BP when spruce and fir invaded to form boreal forest. Fire at 7300 BP resulted in a brief resurgence of herbs and shrubs, primarily alder, followed by forest re-establishment by 6800 BP. Paludification led to an increase in Sphagnum and greatly decreased pollen influx after 3000 BP, followed by an increase in shrubs and herbs at the expense of trees after 1000 BP. Today the Grey Islands are dominated by tuckamore (dwarf shrub barrens) with patchy areas of black spruce forest and sphagnum bog. -- Timing of initial forest development at the expense of shrub tundra (7800 BP) coincides with other sites on the Northern Peninsula, though as much as 1 ka later than the rest of the island and slightly earlier than in southeastern Labrador. Increasing tree birch between 7000 and 4500 BP is indicative of higher summer temperatures and a longer growing season, while also signalling the weakening of a cold ocean influence which, in pollen and dinoflagellate cyst records from the Labrador sea, is dated about 7000 BP. A major forest fire in the record falls within the 8000 to 6500 BP period of increased fire frequency on the Northern Peninsula. Water temperature in the Labrador Sea reached a maximum around 6000 BP, coincident with the start of the hypsithermal period on the Grey Islands. After 2500 BP the Labrador Sea re-exerted a cold bottom water influence and the Grey Islands experienced paludification and forest demise.


identifier: Hollett, Calvin <https://research.library.mun.ca/view/creator_az/Hollett=3ACalvin=3A=3A.html>   (2002) Resistance to Bishop Edward Feild in Newfoundland, 1845-1857, Harbour Buffett : a case study.  Masters thesis, Memorial University of Newfoundland.

abstract: This thesis sees religion as a major category of social history. Its focus is the evangelical opposition from 1845 to 1857 to the Tractarianism of Bishop Feild of the Church of England. The people of Harbour Buffett, Placentia Bay, and Thomas E. Collett were catalysts in that opposition which echoed back to England, itself. Refusals to pay to the Church Society were not the source of the opposition but merely one avenue of resistance to the theology and practice of Bishop Feild. -- Bishop Feild introduced Tractarianism to Newfoundland in the context of a robust Roman Catholicism under Bishop Michael Anthony Fleming and a vibrant, expanding Methodism. The latter cooperated with the evangelical Anglicans in the Newfoundland School Society. Feild drove both to toward political collaboration with Roman Catholics in bringing about Responsible Government by pressing for a denominational school system under the control of his clergy. -- These factors were prominent in Placentia Bay with its expanding economy, population and access to government services. Harbour Buffett was founded out of a desire of a scattered and mobile people, mainly of the evangelical Church of England, to centralize and establish a community with a school and a church. In this effort Archdeacon Wix and Bishop Spencer provided leadership. The Methodists and Newfoundland School Society were also a significant support in the community's evangelicalism which became a major obstacle to the introduction Bishop Feild's Tractarianism to Newfoundland. That evangelicalism, however, did not succeed.