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Spring 2019

David Sawyer

. Though this can be mitigated using metallic shields, any practical finite shield structure is going to suffer from diffraction effects, which cause additional back and sidelobes. Additionally, the shield itself will alter the antenna’s time-domain response, which can affect GPR system performance. To

solve these issues, this work considers radar absorbing materials, which can be used to prevent reflection and dampen currents on a metal surface. This work also considers a variety of metallic shields, such as ground planes, cavities, and high-impedance or electromagnetic bandgap (EBG) surfaces, and

mechanisms which either cause or suppress diffraction on these structures. These structures are also studied in the time domain, to elucidate how these shields perturb an antenna's response when excited by a broadband pulse. Generally, the excitation of surface waves is found to play a prominent role in

Fall 2009

Stafford, Amy

This thesis examines the intersections between biography and fiction in three novels and one biography by Carol Shields: Small Ceremonies, Swann, The Stone Diaries, and Jane Austen. By writing about biography and biographers in each novel, Carol Shields foregrounds the subject of biography and

emphasizes its reliance on imagination and creative interpretation. At the same time, she stresses the deficiencies in the factual records of Jane Austen's life in her biography. Although biography is considered to be the more factual of the two genres, Shields establishes that only fiction has the power to

portray people's inner lives, and that certain truths are therefore accessible only through fiction. Shields is especially interested in using fiction to recover the life stories of women, which have often been lost from historical record.

Fall 2022

White, Kendra

improve the design formulas for geobags. In riverbed sediment studies, stability is often characterized by a critical Shields parameter. To date, there is only one study that has estimated a critical Shields parameter for geobags. Critical Shields parameters rely on critical bed shear stress estimates and

correlation between the critical Shields parameter and boundary Reynolds number when applied to the critical Shields parameters. Third, the stability of a scaled geobag revetment structure, made up of uniform geobags, was evaluated for both a flat and sloped bed. Different geobag sizes and fill ratios were

tested and critical Shields parameters were estimated for each bed configuration. The critical Shields parameters ranged between 0.09 and 0.22. Geobags with lower mass and higher fill ratios tended to be more stable than geobags with higher mass and lower fill ratios. Pre-existing design formulas were

Fall 2017

Brown, Daniel M.

on many factors, including land cover variations. In this thesis, the Athabasca oil sands development (an anthropogenic land cover modification), and the Canadian Shield (a natural land cover variation), will be examined. The oil sands development creates a massive almost 1000 km2 land disturbance

, changing boreal forest to barren land, tailings ponds, and bitumen upgrading facilities. The Canadian Shield is a drastic land cover change from lusher boreal forest on soil to sparser boreal forest on exposed Precambrian bedrock interspersed with intermittent deep, cold lakes. The effect of land

the variation of detected cloud-to-ground lightning density near the Canadian Shield boundary. The results show that significantly less lightning occurs inside the Canadian Shield than just outside, and a strong cloud-to-ground lightning density gradient exists along the boundary. Various

Fall 2011

Corlett, Hilary

The MacKenzie Basin, located in the District of MacKenzie in the southern part of the Northwest Territories, Canada, includes a thick succession of Middle Devonian strata. This basin, bordered to the east by the Canadian Shield and to the south by the Tathlina Uplift, was directly connected to the

distribution of the stromatoporoids and corals may have been controlled by nutrients coming from coastal upwelling or runoff from the exposed Canadian Shield. Effects of early diagenetic processes were evident on the MacKenzie Basin ramp in an intensely bioturbated facies in the Lonely Bay Formation. Burrows

from this facies are dolomite-filled further down the ramp and calcite-filled proximal to the Canadian Shield in the east. Anoxic conditions and the presence of sulphate reducing bacteria may have promoted early dolomite formation in the burrows located in deeper water. Burrows further up the ramp were

Spring 2012

Santos, Dan Michael Uson

. Furthermore, the target current lost is the result of the altered electron gun optics when parallel magnetic flux densities are present. Minimal magnetic shielding (such as a 5-mm-thick, 146.5-mm-long passive shield or a pair of active shield coils with 625 and 430 A turns) around the electron gun and

1978

Luff, David Owen.

Masters thesis analysing the interrelations of vegetation and physical environment that form palsas in a small area of the Canada Precambrian Shield.

Fall 2012

Davidson, Tonya Katherine

In this ethnographic study of the dynamic lives of a population of monuments in Ottawa, I argue that long after they have been unveiled, monuments are imbued with many capacities to act. Monuments inspire loathing or affection, and settle or disturb dominant understandings of place, nation, race,...

Fall 2023

Alsafi, Nora

Climate warming is affecting freshwater systems across the western Canadian subarctic, due to widespread shifts in precipitation regimes, permafrost degradation, and multi-decadal increases in winter baseflow. These changes are significant on the Taiga Shield, which comprises ~20% of North

between the lakes which dominate this region is also increasing. In addition, taliks, zones of unfrozen ground within or above the permafrost layer, are expanding in spatial extent and occurrence across the Taiga Shield. These changes are expected to alter the export of novel chemical constituents

, including dissolved organic matter (DOM), to fluvial networks, with potential implications for carbon cycling and the structure of microbial communities, which comprise the base of aquatic food webs. Despite this, the impact of warming on wintertime fluvial biogeochemistry on the Taiga Shield is poorly

1980

Shields, Mary Elizabeth