3855 research outputs found
Sort by
Tectono-depositional characterization and sedimentary provenance of the Mesoproterozoic Fury and Hecla Basin, Nunavut, Canada
No full textUnderstanding the original depositional environments, architecture, and sediment sources
of intracratonic basins is integral to terrane analysis in Precambrian cratons. Proterozoic
intracratonic basins are widespread throughout Arctic North America, yet their inception and
evolution are poorly understood. The late Mesoproterozoic amalgamation of the supercontinent
Rodinia represents, specifically, an exemplary time to investigate intracratonic basin development
due to many basins being formed. Four basins in eastern arctic Canada and Greenland, known as
the Bylot basins, are thought to be genetically linked due to broadly similar lithologies, age, and
geographic proximity. Southernmost in this basin system is the Fury and Hecla Basin, which
straddles the homonymous strait and is exposed on Baffin Island and Melville Peninsula.
Establishing a correlative framework between the Fury and Hecla Basin and the better
characterized Borden Basin is key to a refined understanding of the broader Bylot basins.
The late Mesoproterozoic strata filling the Fury and Hecla basin, cumulatively known as
the Fury and Hecla Group, comprise six formations: Nyeboe, Sikosak Bay, Hansen, Agu Bay,
Whyte Inlet, and Autridge; of these, three (the Nyeboe, Sikosak Bay, and Whyte Inlet formations)
are sandstone-dominated. Facies analysis indicates that the lowermost Nyeboe Formation records
a range of depositional environments including terrestrial, backshore eolian, marine intertidal,
wave-dominated marine shelf, and marine-offshore transitional. The Sikosak Bay and Whyte Inlet
formations were largely deposited in a wave-dominated marine-shelf realm and show evidence of
large sandwave buildup due to prolonged longshore drift. Seven sandstone samples were analyzed
for detrital zircon U-Pb geochronology from the Fury and Hecla Group, and yielded grains with
ages ranging from ~3350 to ~1695 Ma. Altogether, detrital zircon grains show a bimodal age distribution with peaks at ~2.7 Ga and ~1.9 Ga. Notably, the Archean age peak is more
prominent in the lower stratigraphy, whereas the Paleoproterozoic peak is more significant in the
upper stratigraphy.
Facies and provenance analyses suggest that the Fury and Hecla Basin opened in a half-
graben setting, with its master fault located on the present-day northern side of the basin. Initially,
sediment was likely derived from erosion of local basement rocks. Facies mapping suggests that
the basin expanded its catchment area with time. This trend was accompanied by increasing
recycling of older siliciclastic successions from nearby basins – a provenance pattern that
dominated over local sediment sourcing in the upper strata. As such, despite broadly similar
lithologies and age, the Fury and Hecla Basin shows different depositional environments and a
unique evolution, when compared to the known data, from the other Bylot basins.Doctor of Philosophy (PhD) in Mineral Deposits and Precambrian Geolog
Apports des accommodements à la réussite des étudiants postsecondaires en situation de handicap en contexte de la pandémie : le cas du Collège Boréal.
No full textLe choix du thème de cette recherche fut largement influencé par la position que
j’occupais au Collège Boréal lors du lancement de cette recherche. Puisque j’étais
responsable de la gestion des services d’accessibilité et des services de counseling du
Collège Boréal, la réussite scolaire des étudiants était au cœur de mes activités
professionnelles. À cet effet, je cherchais à comprendre davantage l’impact des
accommodements sur la réussite scolaire des étudiants en situation de handicap en
contexte de pandémie, un groupe qui ne cesse d’augmenter d’année en année. J’ai
également voulu approfondir mes connaissances au sujet de cette population étudiante
sachant que le tout allait me servir au niveau de ma carrière. Sur cette note, je confirme
que les résultats de cette recherche m’ont permis de développer une meilleure
compréhension de l’expérience des étudiants ayant utilisé des accommodements lors
d’une pandémie de type COVID-19.Maîtrise en service social (M.S.S.
Application of laser bessel beams in velocity measurements
No full textIn this thesis we explore the use of Laser Bessel beams in solid surface and fluid velocity
measurements. We present a novel simple technique to measure two velocity components of a
solid surface, using a Bessel beam Laser Doppler Velocimetry (LDV) system. The experiments
examined the intersection of similar two Bessel beams to generate interference fringes at the
intersection region. These fringes, along with the Bessel beam fringes can be used in a simple LDV
system to measure two velocity components. We also explored the use of single Bessel beams for
measurement of fluid flow velocity in a horizontal transparent smooth straight circular pipe using
forward scattering Laser Bessel velocimetry (LBV). The measurements were validated using a
commercial LDV system. In order to produce an acceptable spatial resolution for fluid flow
measurements, we investigated experimentally and numerically the use of Durnin rings (annular
slits) with finite width to produce nearly Bessel beams with limited transverse profile extent and
depth of field (DOF). One purpose of the work was to develop the suitability of laser Bessel
Velocimetry for flow conditions where velocity measurements by alternative instrumentation were
not feasible or were subject to optical access limitation. We also demonstrated, a significant
advantage in using a single Bessel beam to measure the total velocity of two-dimensional flows.Doctor of Philosophy (PhD) in Engineering Scienc
The healing power of the aquatic commons
No full textThis thesis expands upon predominantly land-based understandings of public space to include water
for the common good. The concept of an ‘Aquatic Commons’ orients a hybrid architectural and urban
design program that contributes to the urban and social revitalization of downtown Winnipeg. Focusing
on the Civic Centre and South Point Douglas district—the historic site of colonial settler outposts,
and of new affordable housing projects developed without social amenities that build community and
cultivate safety—this thesis engages with the area’s social and spatial tensions that result from its low
socioeconomic standing, its criminal activity, and its inhabitants who are disproportionately affected by
acute health issues. By proposing the adaptive reuse of two industrial buildings and their large site to
host recreational, educational and food security-focused programs that predominantly focus on water as
a cohesive programmatic feature, this thesis aims to cultivate inclusion and healing.Master of Architecture (M.Arch
Women, mining and gender: experiences in Greater Sudbury
No full textMy interdisciplinary research explores the gendered work experiences of women in
mining. Statistics Canada confirms women’s unequal participation in the industry, and the
Mining Industry Human Resources Council reports that only about fifteen percent of the
Canadian mining labour force are women. The literature attests that women often face challenges
of acceptance in male-dominated, blue-collar industries. They disproportionately experience
discrimination and harassment in industries in which they are the minority, yet the literature does
not fully address women’s work experiences in this industry and it is important to do so given
mining’s important place in Canada’s economy, both nationally and regionally. My study
explores narratives about women’s experiences in this male workplace culture. In 2020, I
interviewed 35 people who work in the mining industry in the city of Greater Sudbury, Ontario
to ask women (N=24) about their direct work experiences and workplace interactions, and men
(N=11) about their work experiences and workplace interactions with women. I used methods of
analysis that “bricolaged” approaches of thematic and critical discourse analysis. My findings
support the need for further initiatives toward equity, diversity, and inclusion, not only in mining,
but in other gender-imbalanced industries. Women described how they experienced resistance to
the achievement of acceptance and respect at work. Many experienced harassment and
discrimination, and spoke about the masculine organizational culture present in their work
environments. Nevertheless, they also described job satisfaction in the work that they perform,
and described bonds of kinship with peers. However, these bonds were usually described in
gendered terms. Women revealed that the camaraderie they seek most to achieve is to be “one of
the boys” or “one of the guys.” At the same time, they spoke about bonds of “sisterhood” in
mining, and how the mining industry offers a space where they celebrate alternate expressions of
femininity, such as being a “tomboy.” Men confirmed that resistance toward women in mining
exists, and that notions of gender essentialism continue to impact perceptions about traits linked
to men and women. In sum, my study reveals that the masculine organizational culture of the
mining industry is complex. The purpose of my interdisciplinary, community-based study was to
understand this complexity and offer solutions for creating more equitable, diverse and inclusive
work cultures within the industry for all workers.Doctor of Philosophy (PhD) in Human Studies and Interdisciplinarit
Analyzing impact on bitcoin prices through Twitter social media sentiments
No full textMany cryptocurrencies exist in today's date, and many more are on the verge of being brought into
circulation. It is a form of a digital currency but instead of being run by a centralized authority and
government, it is a decentralized structure that is created using blockchain technology. These
currencies are highly influential and unpredictable with their factors of influence ranging high and
low all over the world. This research revolves around the most well-renowned cryptocurrency
which is Bitcoin. The focus here is on the discussion around the relationship of bitcoin with the
prominent online media platform called Twitter. Twitter has been taking part in the discussion of
almost all major as well as related incidents and events all around the world. It is a social media
platform that is informative as well as useful for the public so much, that even major personalities,
as well as politicians, take to the platform in order to express their views quickly on an important
matter. The research included firstly gathering the tweets and was divided into two parts - Verified
and Non-Verified users and then a cleaning process was done on the data to make sure that only
the desired and necessary data if left for further research. The tweets regarding bitcoin were
analyzed and utilized for a deeper observation so that the sentiment can be extracted and can be
visualized against the bitcoin prices to derive a conclusion regarding the relationship between
Twitter and Bitcoin prices. The analysis returned a lot of insights as well as inference relating to
the influence that the Bitcoin prices and related tweets have on each other. The results of the report
mention the outcome of the analysis that was found stating the original hypothesis to be true or notM.Sc. in Computational Science
Toronto laneway housing: neighbourhood densification strategies
No full textThe COVID-19 pandemic acted as a catalyst to bring
the unaffordable housing issue in Toronto to the foreground. However, this crisis has been developing for several decades, and it is caused by many factors. One of
the critical factors is the zoning by-law that is restricting
density and maintains the Yellow Belt in Toronto. This
restriction has created a Missing Middle housing issue
that requires a multi-faceted solution to provide Torontonians with affordable housing. However, in the laneways
of Toronto, some housing density can be added to the
existing housing fabric, and that is the Laneway House.
This thesis is focused on providing housing density to
existing laneways within the city, and proposes several
improvements on the current zoning by-law for laneway
suites implemented by the City of Toronto in 2018. The
thesis argues that the existing regulations are deterring
homeowners from building laneway suites. With more
flexible zoning by-laws and incentivizing homeowners,
more laneway suites can be constructed to increase the
housing density in Toronto and contribute positively to
housing affordability.Master of Architecture (M.Arch
Multifocusing seismic imaging of complex geological structures
No full textWe introduce two highly effective stacking approaches, 2.5D multifocusing (MF) and
3D generalized spherical multifocusing (GSMF) algorithms, to improve stacked seismic
sections. The proposed methods can be applied to crooked-line or 3D seismic data
with arbitrary recording geometry from areas with complex near-surface/subsurface to
generate either a 2D crooked stacked section or a 3D stacked volume. Both methods
simultaneously correct for 3D normal moveout and 3D azimuth-dependent dip moveout, and transform multi-coverage prestack seismic data into a stacked section that is
equivalent to a synthesized zero-offset wavefield. In addition, the 3D GSMF approach
accounts for the elevation and spatial coordinate of all source and receiver positions,
so can be applied for seismic data collected in areas with irregular topography. The
2.5D MF moveout operator is accurate for quasi-hyperbolic reflections, whereas, the
3D GSMF traveltime surface is a more general higher-order moveout operator with a
closed-form implicit formulation that can account for non-hyperbolic moveout. The proposed methods efficiently extract valuable 3D structural information when applied to
crooked-line/3D seismic surveys. The introduced methods are data-driven algorithms
and can perform automatically with a coherence-based global optimization search. We
also deployed an efficient processing sequence for applying the developed methods, which
mainly consists of building super common-midpoint bins, wavefield attributes analysis,
multifocusing moveout correction, data enhancement/stacking, and prestack/poststack
dip-independent RMS velocity analysis and migration. Our wavefield analysis uses a
multidimensional differential evolution algorithm to simultaneously determine optimal
wavefield parameters, which improves the efficiency and accuracy of the estimation. The
performance of the proposed methods is tested using 3D synthetic data with both 3D and
crooked-line surveys over various curvatures ranging from low (gently curved interface or planar layer with curvature of zero) to high (spherical reflector or point diffractor). The
numerical tests demonstrate that the new approximations extract dips from seismic data
accurately and are accurate for gently to highly curved interfaces beneath low (multiple homogeneous layers) to relatively high heterogeneous overburden (vertical/horizontal
background velocity with a gradient of 1/s for the 2.5D MF method and vertical background velocity with a gradient of 2/s for the 3D GSMF method). Applying the 2.5D MF
approach to the Larder Lake crooked-line transect with subsurface complexity, as well as
a real data set collected in a thrust-belt area, focused the steeply dipping reflections more
coherently and mapped new reflections that are not visible in the conventional results.
Application of the 3D GSMF method on a 3D low-fold real seismic dataset, acquired over
a complex thrust-belt area with rugged terrain, yielded high-resolution and an accurate
stacked seismic volume with a high signal-to-noise ratio, compared to the conventional
3D stacking.Doctor of Philosophy (PhD) in Mineral Deposits and Precambrian Geolog
Pairwise comparisons and visual perceptions of 3D shape volume estimation
No full textUsing pairwise comparisons for estimations increases accuracy. At present,
scholars use the pairwise comparisons method to make subjective comparison between one-dimensional image and two-dimensional images. This
research is about the subjective comparison of three-dimensional images.
We rst sets a xed object volume and then uses the random method to
generate multiple three-dimensional objects with di erent shapes and then
scale them to our designed volume values. This study also virtualizes and
binarizes the image and prints the actual object in the way of 3D printing
for respondents to observe. Thirty-two respondents used the direct and
pairwise comparisons methods to rate the volume of ve randomly generated 3D shapes. It is found that using the direct method, the observer's
estimation errors is higher (in average) than when the paired comparisons
method is used. The pairwise comparisons method can improve the accuracy of estimating the volume of random objects.Master of Science (MSc) in Computational Science
Music Is the answer: attributing social agency In architecture to music venues In the city
No full textThe stance of the nightclub industry is often perceived as an exclusive, lavish artifact of commodity
in the city. Although, when operated under the care of local music collectives, they are factually
inclusive and have demonstrated great social agency in design. Music and nightclubs [spaces for
dance] are a healthy social activity for the stability and growth of our mental health and should not
be rejected by the superficial view the media projects.
We are starting to see how digital technology is bringing an end to physical collective encounters,
thereby losing the aura of human intimacy of musical performances. To reinvigorate this aura, the
design of an events hall derives principles of social agency design from subcultural venues of our
past and a programmatic envelope strategized to support local music culture and allow for the full
creative freedom of the artist.Master of Architecture (M.Arch