5,768 Works

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West African pan-Africanists and the memorialization of Edward Wilmot Blyden

Aaron Wilford
This thesis examines the debates between West African intellectuals over Pan-Africanism and African nationalism in the early twentieth century. It focuses on intellectuals in three major port cities: Freetown, Lagos, and Cape Coast. These intellectuals practiced different forms of Pan-Africanism that suited the political circumstances of their respective cities. In 1912, they asserted their separate Pan-African visions through the memorialization of Edward Wilmot Blyden, the “Father of Pan-Africanism,” after his death the same year. West...

Ultra-wideband nested coaxial waveguide feed antenna for radio astronomy

Xuan Du
Radio astronomy is becoming increasingly demanding in bandwidth. This thesis presents a new type of ultra-wideband feed antenna, the nested coaxial waveguide feed, for radio telescopes. The goal is to achieve a continuous wideband coverage by nesting octave-bandwidth coaxial feeds. The challenges of coaxial feeds, including aperture mismatch to free space and the narrowing of the radiation pattern with frequency, were studied using both an analytical model and numerical simulation. It was concluded that conventional...

The ecology of predators, parasites, and prey : psoroptis ovis mite infestation of California bighorn sheep (Ovis canadensis califorinia) exposed to cougar (Puma concolor) predation in the Okanagan valley

Sultana Majid
In the Okanagan valley of British Columbia, California bighorn sheep (Ovis canadensis california) populations have been declining, while facing an infestation of Psoroptes ovis mites starting in 2011. These mites cause debilitating skin diseases, which potentially impact bighorn sheep’s hearing ability, impairing awareness, and increasing sheep vulnerability predators such as cougars (Felis concolor). Empirical work on carnivore-parasite interactions with a common prey/host is scarce for large mammals. My study addresses this gap by examining the...

All Things Flow Into Form (Fanwu liuxing 凡物 流形)

Franklin Perkins & Matthew Hamm
The Fanwu Liuxing 凡物流形 ("All Things Flow into Form") is a bamboo text within the "Shanghai strips" collection. This collection consists of a number of bamboo texts that were purchased by the Shanghai Museum (Shanghai Bowuguan 上海博物館) in 1994. Most likely, the texts were looted from a tomb and, as such, their provenance is unknown. However, similarities between the Shanghai strips and the Guodian strips excavated in 1993 suggest a tentative dating for the Shanghai...

Microglia are involved in phagocytosis and extracellular digestion during Zika virus encephalitis in young adult immunodeficient mice

William Enlow, Maude Bordeleau, Jocelyne Piret, Fernando G. Ibáñez, Olus Uyar, Marie-Christine Venable, Nathalie Goyette, Julie Carbonneau, & Guy Boivin
Background Zika virus (ZIKV) has been associated with several neurological complications in adult patients. Methods We used a mouse model deficient in TRIF and IPS-1 adaptor proteins, which are involved in type I interferon production, to study the role of microglia during brain infection by ZIKV. Young adult mice were infected intravenously with the contemporary ZIKV strain PRVABC59 (1 × 10⁵ PFUs/100 µL). Results Infected mice did not present overt clinical signs of the disease...

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Topological quantum phase transitions and topological quantum criticality in superfluids and superconductors

Fan Yang
Superfluids and superconductors can be either fully gapped or gapless with nodal structures in momentum space. Both the gapped and nodal phases can be topologically protected and possess nontrivial topological invariants. Topological quantum phase transitions exist at zero temperature between different gapped phases or between gapped and nodal phases. These phase transitions can be driven by chemical potential and/or spin exchange fields. The two phases separated by the phase transition can have the same local...

Built environments, COVID-19, and environmental injustice : examining the role of settler colonialism and racial capitalism in shaping and transforming eco-social relations in Canada

Aatika Moollabhai
This paper builds on the work of critical environmental justice scholars. I argue that the understanding of environmental injustice requires an expansion beyond conceptualizing environmental injustice as toxic pollutants and external environmental harms being inflicted on marginalized and/or racialized peoples by the settler-colonial state and corporations. Built environments include structures that people work, live, and seek protection from harm and must be included as sites of environmental injustice. The state and corporations that operate under...

ANF preserves dependent types up to extensional equality

Paulette Koronkevich
A growing number of programmers use dependently typed languages such as Coq to machine-verify important properties of high-assurance software. However, existing compilers for these languages provide no guarantees after compiling, nor when linking after compilation. Type-preserving compilers preserve guarantees encoded in types, then use type checking to verify compiled code and ensure safe linking with external code. Unfortunately, standard compiler passes do not preserve the dependent typing of commonly used (intensional) type theories. This is...

Undersampled differential phase shift on-off keying for optical camera communications

Niu Liu, Julian Cheng & Jonathan Holzman
OCC (Optical Camera Communication) has been proposed in recent years as a new technique for visible light communications. This paper introduces the implementation and experimental demonstration of an OCC system. Phase uncertainty and phase slipping caused by camera sampling are the two major challenges for OCC. In this paper, we propose a novel modulation scheme called undersampled differential phase shift on–off keying to encode binary data bits without exhibiting any flicker to human eyes. The...

A predictive modeling and ecocultural study of pine mushrooms (Tricholoma murrillianum) with the Líl̓wat Nation in British Columbia, Canada

Emily Doyle-Yamaguchi
Although recognized by the United Nations Declaration on the Rights of Indigenous Peoples (UNDRIP), Indigenous rights to traditionally held and managed forestlands and forest resources are only beginning to gain visibility in forest research and management in Canada. This presents challenges to First Nations whose cultural and economic priorities for forest use conflict with those of private and public entities, particularly when evidence is required to support traditional use claims. Knowledge of traditional use is...

Evaluation of low-order manifold representation of chemistry in turbulent reactive flows

Arash Mousemi
The experimental data from the Cambridge-Sandia burner working in nine different configurations are post-processed to explore the effects of coordinate, swirl flow ratio, and stratification factor on the conditionally-averaged reactive scalars. First, the mixture fraction and progress variable are employed to construct a two-dimensional conditional manifold by using all of the data – regardless of the coordinate in the physical domain, swirl ratio, and stratification factor. Moreover, one-point, one-time measurements are utilized to compute the...

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