VictorJuiz/thesis huggingface dataset:
Design and Deployment of a Controlled Source EM Instrument on the NEPTUNE Observatory for Long-term Monitoring of Methane Hydrate Deposits

Hydrocarbon deposits in the form of petroleum, natural gas, and natural gas hydrates occur offshore worldwide. Electromagnetic methods that measure the electrical resistivity of sediments can be used to map, assess, and monitor these resistive targets. In particular, quantitative assessment of hydrate content in marine deposits, which form within the upper few hundred meters of seafloor, is greatly facilitated by complementing conventional seismic methods with EM data. The North-East Pacific Time-series Undersea Network Experiment (NEPTUNE) is an underwater marine observatory that provides power and network connection to a host of instruments installed on the seafloor on the Cascadia Margin offshore Vancouver Island. The observatory’s aim is to provide a platform for very long-term studies in which access to data is available on a continuous basis. For this thesis project, a transient dipole-dipole time-domain EM system was constructed and deployed on the NEPTUNE network with the goal of long-term monitoring of a well-studied hydrate deposit in the area. The instrument includes a source transmitter of electrical current and individual receivers to measure small electric field variations. The instrument is powered by the NEPTUNE observatory and data can be collected remotely by connecting to the instrument through the web. Data collected so far from the instrument are consistent with a resistive structure. The best fitting model from 1D inversion is a 36 ± 3 m thick layer of 5.3 ± 0.3 Ωm resistivity, overlaying a less resistive 0.7 ± 0.1 Ωm halfspace. Average hydrate concentration, deduced with the aid of ODP-889 well-log derived Archie’s parameters, is approximately 72% of pore space in the resistive layer, consistent with the very high concentration of gas hydrates (~80%) recovered from seafloor cores. The weekly collection of data from the instrument shows that the resistive structure has changed little since monitoring began in October of 2010.

Keywords: Controlled Source Electromagnetic Method
Gas Hydrates
NEPTUNE observatory
Methane hydrate
CSEM
Marine Geophysics
Monitoring
Time-lapse
Advisor: Edwards, Richard Nigel
Education as a Private or a Global Public Good: Competing Conceptual Frameworks and their Power at the World Bank

This thesis presents the argument that the World Bank’s education policies are discursively inconsistent due to the concurrent adoption of conceptual frameworks – namely the neoliberal and global public goods frameworks – which are arguably in conflict with one another. More specifically, the World Bank presents education as both a public and a private good. This assessment is reached via a critical analysis of the Bank’s education policy discourse. The Bank’s policies are furthermore argued to be grounded in market economics and therefore are in tension with the notion of education as a human right – a legal and political framework, advocated by other development organizations, but neglected by the Bank. Over the course of this thesis, neoliberal influences on the World Bank’s education policies are critiqued on several levels, including potential ethical ramifications concerning equity, discursive logic and questionable use of evidence. This dissertation furthermore suggests that the Bank can re-conceptualize education in a light that does not engender these critiques, by embracing a rights-based vision of education. It is argued that it is not necessary for the Bank to relinquish an economic conceptualization of education, and that it is possible for the human rights and economic discourses to go hand-in-hand. Despite some tensions, education can be supported by both a public goods and rights-based framework, and that via such measures as collaboration with organizations that conceive of education as a right and reducing the dominance of economists within the organization, the Bank’s policies will become aligned with this rights-based vision. This thesis argues that World Bank education policies can take steps toward improvement if the neoliberal notion of education as an exclusive, private good is abandoned in favour of education as a non-exclusive, public good, and a right.

Keywords: international education policy
global governance of education
World Bank
Advisor: Portelli, John P.
Mundy, Karen
Spin Hall Effect of Light in Semiconductors

The lateral spatial separation between the circular polarization components of a linearly polarized light beam impinging at off-normal incidence on an air-semiconductor interface is investigated experimentally and theoretically. This fundamental optical phenomenon is referred to as the Spin Hall effect of light (SHEL). An optical pump-probe technique is demonstrated to resolve in situ the nanometer size SHEL displacement of a beam transmitted inside an absorptive material. Three different types of optical interactions in silicon and GaAs demonstrate the technique’s general applicability. First, resonant ∼150 fs pump and probe pulses at λ = 820 nm resolve the SHEL displacement via free-carrier absorption in a 10 μm thick silicon sample. The measured SHEL displacements for a p-polarized probe beam are obtained between −10 to 150 nm as a function of the angle of incidence on the sample. Different angles of incidence are achieved by keeping a fixed angular separation between the pump and the probe beams while rotating the sample about the axis perpendicular to the plane of incidence. In another experiment, an optically thin (500 nm thick) GaAs sample allows one to use Pauli-blocking as an optical interaction to investigate the polarization and angular dependence of the SHEL in the probe beam. For such a polarization-dependent imaging technique, the SHEL displacement in the pump beam also contributes to the measured signal and is evaluated experimentally. A probe beam at normal incidence is used to measure a SHEL displacement of ∼180 nm in a transmitted p-polarized pump beam impinging on the sample with an angle of incidence of 55 degrees. Finally, two-photon absorption is used to resolve the SHEL in a (001) oriented 500 μm thick GaAs wafer using an optical source generating sub-bandgap radiation (λ = 1550 nm) with a pulse duration of 120 fs. Linearly p- and s- co-polarized pump and probe beams are also used to investigate the polarization dependence of the SHEL. All the experimental results obtained using these different optical interactions agree with the theory within the experimental error. Finally, analytical expressions of the shifts experienced by the circular components of a beam impinging at an interface between two optical media are also derived for an incident beam with an arbitrary spatial distribution.

Keywords: Spin Hall effect of light
Semiconductors
Ultrafast nonlinear optics
Polarization
Pump-probe
SHEL
Advisor: Driel, Henry M. van
Books for the Instruction of the Nations: Shared Methodist Print Culture in Upper Canada and the Mid-Atlantic States, 1789-1851

Recent historians who have written about the development of Methodist religious identity in Upper Canada have based their narratives primarily on readings of documents concerned with ecclesiastical polity and colonial politics. This study attempts to complicate these narratives by examining the way religious identity in the province was affected by the cultural production and distribution of books as denominational status objects in a wider North American market before the middle of the nineteenth century. The first chapter examines the rhetorical strategies the Methodist Book Concern developed to protect its domestic market in the United States from the products of competitors by equating patronage with denominational identity. The remaining chapters unfold the influence a protracted consumption of such cultural commodities had on the religious identity of Methodists living in Upper Canada. For more than a decade after the War of 1812, the Methodist Book Concern relied on a corps of Methodist preachers to distribute its commodities north of the border. This denominational infrastructure conferred the accidental but strategic advantage of concealing the extent of the Concern’s market and its rhetoric from the colony’s increasingly anti-American elite. The Concern’s access to its Upper Canadian market became compromised, however, when Egerton Ryerson initiated a debate over religious equality in the province’s emergent public sphere in the mid-1820s. This inadvertently drew attention to Methodist textual practices in the province that led to later efforts on the part of Upper Canadians to sever the Concern’s access to its market north of the border. When these attempts failed, Canadian Methodists found ways to decouple the material and cultural dimensions of the Concern’s products in order to continue patronizing the Concern without compromising recent gains achieved by strategically refashioning themselves as loyal Wesleyans within the colony’s conservative political environment. The result was the emergence of a stable and enduring transnational market for Methodist printed commodities that both blunted the cultural influence of British Wesleyans and prepared the ground for a later secularization of Methodist publishing into and beyond the middle decades of the nineteenth century.

Keywords: Methodism
religion
print culture
Egerton Ryerson
John Strachan
Methodist Book Concern
Nathan Bangs
Methodist Episcopal Church
reading
publishing
Upper Canada
British Wesleyanism
John Wesley
Pierre Bourdieu
public sphere
Jurgen Habermas
Advisor: Fleming, Patricia
Making History Heal: Settler-colonialism and Urban Indigenous Healing in Ontario, 1970s-2010

This thesis focuses on the interrelationship between Canadian colonial histories and Indigenous healing. I begin by problematising how colonialism is invoked in contemporary scholarship on Aboriginal health and healing, and arguing for more precise historical methods and a more relational understanding of colonial processes. Historicising Indigenous agency is integral to this analysis. Whilst colonial continuities in contemporary Canadian public policy discourse is an important theme, I also attend to social movements, institutions, professions, and political and economic forces beyond the state. Indigenous healing as a socio-political movement itself has a history dating at least to the late 1960s. Urban Indigenous healing discourse is characterised by linking present-day suffering to collective historical losses, and valorizing the reclamation of Indigenous identity, knowledge and social relations. Drawing on urban Indigenous social histories from Kenora and Toronto, I consider the urban healing movement as an example of Indigenous resistance influenced by the international decolonization and North American Red Power movements, but which over time has also engaged with dominant institutions, professions, policies, and discourses, such as the concept of trauma. My analysis considers professionals and patients invoking historical trauma as political agents, both responding to and participating in broader shifts in the moral economy. These shifts have created the conditions of possibility for public victimhood to become a viable strategy for attracting attention and resources to suffering and injustice. The thesis highlights the centrality and complexity of self-determination in urban Indigenous healing, drawing on historical and ethnographic analysis from three southern Ontario cities. I analyse how the liberal multiculturalism paradigm dominant in health policy and health care settings contributes to mental health professionals’ failure to recognise Aboriginal clients and issues. I argue that characterising pan-Aboriginal and ethno-national healing as approaches in opposition to one another produces an insufficiently nuanced analysis in the context of urban Indigenous subjectivities and social relations, where both approaches are valuable for different reasons. The thesis urges greater attention to the role of languages and local histories, and to the threat which dominant policy discourses on residential schools and mental health pose to the maintenance of distinct ethno-national histories, epistemologies and traditions in urban Indigenous healing.

Keywords: Indigenous-state relations (Canada)
urban Indigenous peoples
Indigenous healing
settler-colonialism (Canada)
Advisor: Birn, Anne-Emanuelle
McElhinny, Bonnie
Understanding how Women Seek Health Information on the Web

The purpose of this dissertation is to examine how women seek health information on the Web in relation to information source characteristics, situational characteristics, and socio-demographic characteristics. The Web is conceptualized as three facets that reflect the three main modes of seeking health information on the Web: websites; Web-based bulletin boards and chatrooms; and Web-based listservs and newsgroups. The lack of analytical research on this gendered online activity prompted this study. The conceptual framework is based primarily on theoretical foundations from two academic disciplines: information science and health sciences. The independent variables in the conceptual framework are health information need, family caregiving, perceived Web self efficacy, perceptions of the quality and accessibility of the Web as a source of health information, and socio-demographic variables. The dependent variable is intensity (frequency) of seeking health information on the Web (FSHIW). Data was collected from 264 women from November 2000 until April 2001 using a Web survey questionnaire. The participants were predominantly well educated, English-speaking Canadians. A subset of 27 survey respondents completed at least one additional component of this multi-method study. Perception of the reliability of the Web as a source of health information was identified as the key variable influencing frequency of seeking health information on the Web (FSHIW). As well, perceived information source reliability was correlated with two information source characteristics, perceived information source relevance and cognitive access. Two situational variables, health information need and family caregiving, were weakly correlated with FSHIW. Three socio-demographic variables – racial identity, household income, and occupation – affected FSHIW. Qualitative interview data, Web use journals, and recordings of Web use sessions provided a contextualized understanding of the survey data. In particular, they highlighted the importance of situational and affective relevance. To-date, very few empirical research studies have been conducted on how women seek health information on the Web. This unique multi-method study contributes to a better understanding of women’s use of the Web as a source of health information for resolving personal health problems and caring for family members by identifying key variables that affect the frequency of this online behaviour and contextualizing these variables.

Keywords: women's health
information seeking on the Web
Advisor: Choo, Chun Wei
Contributions towards a Fine Structure Theory of Aronszajn Orderings.

The purpose of this thesis is to add to the structure theory of Aronszajn orderings. We shall focus essentially in four topics. The first topic of discussion is about the relation between Lipschitz and coherent trees. I will demonstrate that the tree T(ρ0) is coherent without any extra set theoretic hypothesis. The second topic presents an application of Todorcevic's ρ functions to provide some partial answers to an old question of Juhaz asking whether a standard weakening of Jensen's diamond principle implies the existence of a Suslin tree. In the third topic we focus on providing a satisfactory rough classification result of the class of Aronszajn lines. Our main result is that, assuming PFA, the class of Aronszajn lines is well-quasi-ordered by embeddability. The last topic is an investigation of the gap structure of the class of coherent Aronszajn trees. I will show that, assuming PFA, the class of coherent Aronszajn trees quasi-ordered by embeddability is the unique saturated linear order of cardinality [special characters omitted].

Keywords: trees
linear orderings
Advisor: Todorcevic, Stevo
The 1990 Kirpan Case: Cultural Conflict and the Development of Equity Policy in the Peel District School Board

In 1990, a case came before the Ontario Human Rights Commission involving the collision of a religious rights policy enshrined in the Ontario Human Rights Code 1981 and a Peel Board of Education disciplinary policy prohibiting weapons including the kirpan, a dagger-like article of religious faith worn by baptized Sikhs. Harbhajan Singh Pandori claimed infringement of his religious rights as a Sikh under the Code. In a joint complaint, the Ontario Human Rights Commission alleged the Code had been violated in a Peel Board policy restricting the religious rights of Sikhs by prohibiting the kirpan. Attempts to mediate between complainant Sikhs and the Peel Board failed. The dispute went before an Ontario Human Rights Commission tribunal adjudicated by Rabbi W. Gunther Plaut who ruled that the kirpan was a religious symbol and could be worn to school subject to restrictions. The Pandori kirpan case illustrates the complexity of resolving issues of cultural and religious conflict in public institutions undergoing demographic change. Significant to the kirpan case were Canadian immigration policy changes which eliminated race and ethnicity from admission criteria. As a result, the Region of Peel witnessed significant intake of immigrants including Sikhs, some of whom insisted on their right to wear a kirpan. The extensive public debate that followed afforded valuable insight on the political process of policy-making in education and accommodating diversity in public educational institutions. The debate also set the stage for the development of the Peel Board’s equity policy documents--Manifesting Encouraging and Respectful Environments and The Future We Want launched in 2000. Despite the new equity documents, some observers have remarked that institutional change is slow unless pressure is applied by the courts or the Ontario Human Rights Commission. While the kirpan issue has been put to rest in Canada, issues of competing rights continue to challenge Canadians. The kirpan case demonstrates that balancing competing rights in a multicultural society is an ongoing struggle with no final resolution. In the twenty-first century, as Canada continues to diversify, debates concerning accommodation continue to be reflected in the public schools.

Keywords: kirpan
religious accommodation
Sikh
Peel District School Board
equity policy
human rights
Advisor: Troper, Harold M.
Discourse, Governance and Subjectivity: Interdisciplinarity and Knowledge-making in Engineering and in Medicine

Governments across the world rationalize interdisciplinarity as an effective strategy for answering complex problems of social importance, drawing on large investments of resources to technical and biomedical sectors. I have identified this rationale as part of specific discursive relations and subsequently troubled its dominance through an exploration of how it has been authorized, and how faculty and administrators negotiate subjectification in engineering and medicine where this discourse dominates. Neo-liberal approaches to knowledge-production are deconstructed and analyzed. An archive was assembled of key texts pertaining to interdisciplinarity including documents produced by the OECD, the Canadian federal and Ontario provincial governments, the University of Toronto (UofT), academics and the popular press. A Foucauldian discourse analysis of these texts provided a specific historical context for interviews conducted with 20 faculty and administrators identified as interdisciplinary knowledge-makers. Subsequently, a situated analysis of how discourse is embodied and experienced was developed and applied to the whole archive. Four inter-related concepts were identified as making-up the popular discourse of interdisciplinarity: diversify-collaborate-innovate-integrate. According to this narrative, knowledge-makers are expected to diversify through collaboration in order to innovate and produce knowledge that is useful and marketable. From the discovery of insulin to the establishment of the MaRS discovery district, knowledge-making examples from UofT are analyzed to identify the social relations that make the idea possible that researchers should address problems of ‘relevance’. I argue that interdisciplined subjects are ‘facilitated’ to fulfill this popular narrative by management approaches that capitalize on intrinsic notions of ‘making-a-difference’. Concurrently, different narratives of interdisciplinarity are embodied and promoted as individuals negotiate ontological and epistemological issues in their daily practice. This research contributes to the refinement of Foucauldian discourse analysis, and informs scholarship on the effects of neoliberal approaches to knowledge-making and the professionalization projects of engineering and medicine.

Keywords: interdisciplinarity
knowledge-making
globalization
faculty
discourse analysis
engineering
medicine
Advisor: Muzzin, Linda
Development of Brain-machine Interfaces

A brain-machine interface (BMI) uses signals from the brain to control electronic devices. One application of this technology is the control of assistive devices to facilitate movement after paralysis. Ideally, the BMI would identify an intended movement and control an assistive device to produce the desired movement. To implement such a system, it is necessary to identify different movements involving a single limb and users must be able to issue commands at any instant instead of only during specific time windows determined by the BMI itself. A novel processing technique to identify voluntary movements using only four electrodes is presented. Histograms containing the spectral components of intracranial neural signals displaying power changes correlated with movement were unique for each of three movements performed with one limb. Off-line classification of the histograms allowed the identification of the performed movement with an accuracy of 89%. This movement identification system was interfaced with a neuroprosthesis for grasping, fitted to a tetraplegic individual. The user pressed a button triggering the random selection and classification of a brain signal previously recorded intracranially from a different person while performing specific arm movements. Correct identification of the movement triggered grasping functions. Movement identification accuracy was 94% allowing successful operation of the neuroprosthesis. Finally, two BMIs for the real-time asynchronous control of two-dimensional movements were created using a single electrode. One EEG-based system was tested by a healthy participant. A second system was implemented and tested using recordings from an individual undergoing clinical intracranial electrode implantation. The users modulated their 7 Hz-13 Hz oscillatory rhythm through motor imagery. A power decrease below a threshold activated a ``brain-switch''. This switch was coupled with a novel asynchronous control strategy to control a miniature remotely-controlled vehicle as well as a computer cursor. Successful operation of the EEG system required 6 hrs of training. ECoG control was achieved after only 15 minutes. The operation of the BMI was simple enough to allow users to focus on the task at hand rather than on the actual operation of the BMI.

Keywords: brain-machine interface
BMI
brain-computer interface
BCI
assistive technology
rehabilitation
Advisor: Popovic, Milos R.