VictorJuiz/thesis huggingface dataset:
Structure and Properties of Nanomaterials: From Inorganic Boron Nitride Nanotubes to the Calcareous Biomineralized Tubes of H. dianthus

Several nanomaterials systems, both inorganic and organic in nature, have been extensively investigated by a number of characterization techniques including atomic force microscopy (AFM), electron microscopy, Fourier transform infrared spectroscopy (FTIR), and energy dispersive x-ray spectroscopy (EDX). The first system consists of boron nitride nanotubes (BNNTs) synthesized via two different methods. The first method, silica-assisted catalytic chemical vapour deposition (SA-CVD), produced boron nitride nanotubes with different morphologies depending on the synthesis temperature. The second method, growth vapour trapping chemical vapour deposition (GVT-CVD), produced multiwall boron nitride nanotubes (MWBNNTs). The bending modulus of individual MWBNNTs was determined using an AFM three-point bending technique, and was found to be diameter-dependent due to the presence of shear effects. The second type of nanomaterial investigated is the biomineralized calcareous shell of the serpulid Hydroides dianthus. This material was found to be an inorganic-organic composite material composed of two different morphologies of CaCO3, collagen, and carboxylated and sulphated polysaccharides. The organic components were demonstrated to mediate the mineralization of CaCO3 in vitro. The final system studied is the proteinaceous cement of the barnacle Amphibalanus amphitrite. The secondary structure of the protein components was investigated via FTIR, revealing the presence of β-sheet conformation, and nanoscale rod-shaped structures within the cement were identified as β-sheet containing amyloid fibrils via chemical staining. These rod-shaped structures exhibited a stiffer nature compared with other structures in the adhesive, as measured by AFM nanoindentation.

Keywords: boron nitride nanotubes
biomineralization
atomic force microscopy
nanomechanics
Advisor: Walker, Gilbert C.
Knowledge, Truth, and Schooling for Social Change: Studying Environmental Education in Science Classrooms

While recent research trends in science education have focussed the collective attention at utilizing the science curriculum as a means towards positive social change, such efforts have largely been predicated on understandings of the nature of knowledge and truth as socially constructed entities. Through this lens of social constructivism, knowledge is said to bear the signature of individuals and institutions in power, and therefore extant knowledge is considered to be the vehicle for further oppression of disadvantaged groups. There are at least two ways in which this argument is deeply flawed—social constructivism accords to itself epistemic positions it denies others, and an intellectually honest application of its principles leads to a position where there is no way to distinguish between better or worse positions on issues. In contrast, the principle of social realism takes a ‘middle path’, acknowledging the social reality of knowledge construction but disavowing the relativism of social constructivism. Through this epistemological foundation, implications arise for curriculum theory—how is it that we may discriminate forms of knowledge for in/ex-clusion into the school curriculum? In this study, I consider the curriculum changes in the Ontario elementary science anxd technology curriculum. I ask two key questions: (i) What are the effects of the curriculum revisions on the knowledge content of the science curriculum? and: (ii) What are the characteristics of science pedagogy in fulfilment of these curriculum changes? I develop instruments to analyze curriculum documentation, and classroom pedagogy. The major findings of this project include: (i) the curriculum revisions have added environmental knowledge expectations with varying degrees of disconnection from the scientific content knowledge; (ii) knowledge expectations removed to accommodate environmental expectations constituted important scientific principles; (iii) environmental pedagogy in science classrooms reflected the disconnection between science and environmental knowledge, most obviously in the upper grades where the degree of boundary maintenance between knowledge forms was strongest; (iv) this disconnection between environmental and scientific knowledge forms inhibited the cumulative modality of knowledge (re)production. A discussion of results and the general principles of the importance of knowledge concludes the project.

Keywords: curriculum theory
science education
environmental education
sociology of curriculum
social realism
Basil Bernstein
Advisor: Pedretti, Erminia
Clinical Implications of HIV-1, HSV-2 Co-infection and Opportunities for Intervention

HSV-2 may have adverse consequences in HIV. I evaluated the impact of HSV-2 co-infection on (highly active antiretroviral therapy)-untreated HIV infection in a systematic review of observational studies (study 1) and a retrospective cohort (study 2). I further evaluated whether HSV reactivation rates in co-infected persons differ by use of suppressive cART (study 3). Study 1 found modest evidence that HSV-2 seropositivity may be associated with accelerated progression to opportunistic infection or clinical AIDS, but not with increased HIV viral load. Some evidence suggests that HSV-2 disease activity is associated with increased HIV viral load and decreased CD4 counts. Study 2 compared rates of CD4 count change by HSV-2 status (Focus HerpeSelect ELISA) among 218 patients with a past period of ART-untreated follow-up using mixed linear regression models. No significant difference in the rate of CD4 count change was observed in HSV-2 seropositives at +13.6 cells/mm3/year (p=0.12) in univariate analysis, and -4.5 cells/mm3/year (p=0.68) in analysis adjusted for sex, HSV-1, oral and genital HSV symptoms, immigrant status, and immigrant*time interaction. These findings support the need for carefully designed and executed studies of HSV-2 suppression as an adjunctive management strategy for HIV disease, but raise questions regarding the exact mechanism of negative synergy between these viruses and the relative importance of HSV-2 latency and replication in driving these effects. In Study 3, 44 cART-naïve and 41 treated (HIV RNA<50 copies/mL) HIV+ adults with HSV-1 and/or 2 co-infection collected oral, genital and anal swabs daily for 28 days. Negative binomial models were used to quantify the relationship between cART and HSV shedding (Roche LightCycler HSV1/2). Overall HSV shedding was low, at a median (IQR) of 3.6% (0, 14.3%) of days. No relationship was seen between cART and HSV-1 or 2 shedding in univariate (RR=1.55, 95%CI=0.83,2.87) or multivariate analysis adjusted for sex, baseline CD4, recent immigrant status, and time since HIV diagnosis (aRR=1.05, 95%CI=0.43,2.58). Null results were also observed for HSV-1 and HSV-2 considered separately. That HSV shedding persists despite cART suggests that trials of anti-HSV drugs for improving HIV outcomes may be warranted in such patients.

Keywords: HIV
Herpes simplex virus type 2
Advisor: Walmsley, Sharon
Transfer Relations in Essentially Tame Local Langlands Correspondence

Let F be a non-Archimedean local field and G be the general linear group GLn over F. Bushnell and Henniart described the essentially tame local Langlands correspondence of G(F) using rectifiers, which are certain characters defined on tamely ramified elliptic maximal tori of G(F). They obtained such result by studying the automorphic induction character identity. We relate this formula to the spectral transfer character identity, based on the theory of twisted endoscopy of Kottwitz, Langlands, and Shelstad. In this article, we establish the following two main results. (i) To show that the automorphic induction character identity is equal to the spectral transfer character identity when both are normalized by the same Whittaker data. (ii) To express the essentially tame local Langlands correspondence using admissible embeddings constructed by Langlands-Shelstad χ-data and to relate Bushnell-Henniart's rectifiers to certain transfer factors.

Keywords: representation theory
number theory
Advisor: Arthur, James
The Effects of Weather and Climate Variability on the Well-being of a Rural and Urban Aboriginal Group in Ontario, Canada

The role of weather and climate variability on the health of Aboriginal people in Fort Albany and Toronto, Ontario, Canada is explored through four complementary research studies. The first study examined past temperature trends of Fort Albany (using climate records of Moosonee) and Toronto. Temperature variability was found to be greater in Moosonee than in Toronto, and day to day temperature minimum (Tmin) threshold exceedances of 5 degrees Celsius was found to have significantly declined in both Toronto and Fort Albany. The second study explored the effects of climate change on a rural First Nation group in Fort Albany. Observed environmental changes include changes in the timing of seasons, spring melt and ice freeze-up; warmer seasons, an increase in extreme and unpredictable weather, and changes in animal patterns. These changes have affected subsistence harvesting activities and community infrastructure, which have lead to increased health risks, though many community members have exhibited resiliency and adaptation. The third study compared current health status between an urban Aboriginal and non-Aboriginal group. Urban Aboriginal participants were found to be at greater risk to psychological distress and seasonal affective disorder (SAD) than non-Aboriginal participants. Moreover, those who self-rated their health as poor/fair were more likely to exhibit psychological distress than those who self-rated their health as good/very good/excellent. The fourth study compared the effects of weather and seasonal change among a rural First Nation group, an urban Aboriginal group and an urban non-Aboriginal group. Urban Aboriginal participants were most affected by weather while rural Aboriginal (i.e. First Nation) participants were least affected by weather. These studies demonstrate that both urban and rural Aboriginal groups may be at risk to climate change and weather-related changes; though specific implications may differ due to different lifestyles and capacities to adapt to environmental conditions.

Keywords: climate change
Aboriginal health
climate variability
urban
rural
adaptation
seasonal change
weather
Advisor: Gough, William A.
The Epistemology of Measurement: A Model-based Account

Measurement is an indispensable part of physical science as well as of commerce, industry, and daily life. Measuring activities appear unproblematic when performed with familiar instruments such as thermometers and clocks, but a closer examination reveals a host of epistemological questions, including: 1. How is it possible to tell whether an instrument measures the quantity it is intended to? 2. What do claims to measurement accuracy amount to, and how might such claims be justified? 3. When is disagreement among instruments a sign of error, and when does it imply that instruments measure different quantities? Currently, these questions are almost completely ignored by philosophers of science, who view them as methodological concerns to be settled by scientists. This dissertation shows that these questions are not only philosophically worthy, but that their exploration has the potential to challenge fundamental assumptions in philosophy of science, including the distinction between measurement and prediction. The thesis outlines a model-based epistemology of physical measurement and uses it to address the questions above. To measure, I argue, is to estimate the value of a parameter in an idealized model of a physical process. Such estimation involves inference from the final state (‘indication’) of a process to the value range of a parameter (‘outcome’) in light of theoretical and statistical assumptions. Idealizations are necessary preconditions for the possibility of justifying such inferences. Similarly, claims to accuracy, error and quantity individuation can only be adjudicated against the background of an idealized representation of the measurement process. Chapters 1-3 develop this framework and use it to analyze the inferential structure of standardization procedures performed by contemporary standardization bureaus. Standardizing time, for example, is a matter of constructing idealized models of multiple atomic clocks in a way that allows consistent estimates of duration to be inferred from clock indications. Chapter 4 shows that calibration is a special sort of modeling activity, i.e. the activity of constructing and testing models of measurement processes. Contrary to contemporary philosophical views, the accuracy of measurement outcomes is properly evaluated by comparing model predictions to each other, rather than by comparing observations.

Keywords: philosophy of science
measurement
modeling
physics
metrology
accuracy
instruments
Advisor: Morrison, Margaret
Following Sayyida Zaynab: Twelver Shi‘ism in Contemporary Syria

Outsiders, such as Lebanese and Syrian Shi‘is often refer to Twelver Shi‘is in the Syrian shrine-town as ‘traditional,’ and even ‘backward.’ They are not the only ones. Both Saddam Hussein and Ayatollah ‘Ali Khamenei have called the bloody flagellation practices, which have only increased in popularity in Sayyida Zaynab over the past few decades, ‘backward’ and ‘irrational.’ Why do these outsiders condemn these Twelver Shi‘is and their Muharram rituals? Why are ‘traditional’ practices popular in the Syrian shrine-town of Sayyida Zaynab? What does ‘tradition’ mean in this context? This dissertation begins with the last question regarding the notion of ‘tradition’ and examines seminary pedagogy, weekly women’s ritual mourning gatherings, annual Muharram practices, and non-institutionalized spiritual healing. Two theoretical paradigms frame the ethnography. The first is Talal Asad’s (1986) notion that an anthropology of Islam should approach Islam as a discursive tradition and second, various iterations of the Karbala Paradigm (Fischer 1981). The concepts overlap, yet they also represent distinct approaches to the notion of ‘tradition.’ The overarching argument in this dissertation is that ‘tradition’ for Twelver Shi‘is in Sayyida Zaynab is not only a rhetorical trope but also an intimate, inter-subjective practice, which ties pious Shi‘i to the members of the Family of the Prophet. The sub-topics are changing patterns in religious pedagogy, the role of embodiment, self, and inter-subjectivity in women’s ritual mourning gatherings, and the applicability of Mikhail Bakhtin’s concept of the carnivalesque (1984). Inspired by Frederick M. Denny (1985), who coined the term ‘orthopraxy’ to describe the importance of ritual practice in Islam, this dissertation refers to transgressive and carnivalesque religious performances as ‘heteropraxy.’ In particular, the emphasis on ‘heteropraxy’ is a critique of recent research on Arab Muslim women’s piety by Saba Mahmood (2005) and Lara Deeb (2006).

Keywords: Syria
Islam
Shi'ism
Advisor: Mittermaier, Amira
The Syntax of Functional Projections in the vP Periphery

This thesis investigates the functional categories in the vP domain, including aspect, modality, and focus. For this research initiative, five constructions were examined: the Mandarin temporal adverbial, the Mandarin excessive ta, the Mandarin de/bu, the Turkish question particle –mI, and the Armenian auxiliary constructions. These constructions involve functional categories that are expected to appear at the C/IP periphery; however, they surface inside the vP domain. The existence of these low grammatical elements raises non-trivial questions such as how functional categories should be mapped out in the structure, and whether a unified structure can be proposed to account for the cross-linguistic phenomena examined in this thesis. The investigation of these constructions showed that there are cross-domain interactions between low and high functional categories. While Mandarin temporal adverbial constructions showed interactions between viewpoint aspect and lexical aspect via the distributions of the temporal adverbials and various co-occurrence restrictions, the other four constructions demonstrated interactions between the low and the high categories via intervention effects. I argue that low functional categories must be licensed by their counterparts in the C/IP domain, and that the licensing relation and the structural conditions imposed on this relation can be captured if an Agree relation is established between the functional categories in these two domains. The analysis also reveals that low functional categories are the result of feature lowering from v* to some functional projection below it, and the formal features of the low functional categories must assign their values to their counterparts in the C/IP domain via Agree to provide a meaningful input to LF. I propose a parallel analysis between CP and vP to account for the existence of the low grammatical elements in two respects: (1) C and *v, as phase heads, have an edge feature (EPP) and Agree features that need to be valued and/or checked at a functional projection lower than the each phase head; (2) the formal features of C can appear at *v if they are licensed by an associate feature present in the C/T domain for the purpose of Full Interpretation (Chomsky 1995, 2000).

Keywords: functional categories
left periphery
Agree
Advisor: Massam, Diane
Latvian Organ Music: A Performer’s Guide and Bibliography

Organ music in Latvia has a long history spanning over seven centuries of organ building and organ music making; however, national music traditions were not established until the end of the 19th century and the beginning of the 20th century. The scope of this dissertation is to provide an overview of Latvian organ music, to define what features of the musical and social-historical contexts of the Republic of Latvia have contributed to the development of organ music in the country, and to provide practical information for organists and anyone interested in Latvian organ music. The research divides into four chapters. In Chapter One, “Latvian Organ Studies”, the existing sources of information on Latvian organ music such as books, research papers and scores are reviewed. Other sources of information such as library collections, Internet resources and organizations are listed. The second chapter, “The ‘Language’ of Latvian Organ”, explores the two key components of the voice of Latvian organ – Latvian organ music, both solo and collaborative literature, and Latvian organs. The third chapter is entitled ”A Performer’s Analysis of Selected Organ Compositions”. In order to establish the voice of Latvian organ music three major organ works are examined: Fantasia in g (1902) by Alfrēds Kalniņš (1879-1951), Variations on the Name B-A-C-H (1969) by Marģeris Zariņš (1910-1993) and Te Deum (1991) by Pēteris Vasks (1946). Each analysis begins with the composer’s biography, followed by information on the composer’s organ oeuvre and the piece. Structural and harmonic analysis, as well as performance suggestions that include registration, tempo and articulation issues are provided. Chapter Four, “Summary and Recommendations”, concludes the dissertation. Four appendices contain comprehensive lists of Latvian organ works, both solo and collaborative literature, and list additional resources.

Keywords: organ music
Latvia
Advisor: Dolloff, Lori-Anne
Predicting Community-based Methadone Maintenance Treatment (MMT) Outcome

This was a retrospective study of a community-based methadone maintenance treatment (MMT) program in Toronto. Participants (N = 170) were federally sentenced adult male offenders admitted to this voluntary program between 1997 and 2009 while subject to community supervision following incarceration. The primary investigation examined correlates of treatment responsivity, with principal outcome measures including MMT clients’ rates of: (i) illicit drug use; and (ii) completion of conditional (parole) or statutory release (SR). For a subset (n = 74), recidivism rates were examined after a 9-year interval. Findings included strong convergent evidence from logistic regression and ROC analyses that an empirically and theoretically derived set of five variables was a stable and highly significant (p <.001) predictor of release outcome. Using five factors related to risk (work/school status, security level of releasing institution, total PCL-R score, history of institutional drug use, and days at risk), release outcome was predicted with an overall classification accuracy of 88%, with high specificity (86%) and sensitivity (89%). The logistic regression model generated an R2 of .55 and the accompanying AUC was .89, both substantial. Work/school status had an extremely large positive association with successful completion of community supervision, accounting for > half of the total variance explained by the five-factor model and increasing the estimated odds of successful release outcome by > 15-fold. Also, when in the MMT program, clients' risk taking behaviour was significantly moderated, with low overall base rates of illicit drug use, yet the rate of parole/SR revocation (71%) was high. The 9-year follow-up showed a high mortality rate (15%) overall. Revocation of release while in the MMT program was associated with a significantly higher rate and more violent recidivism at follow-up. Results are discussed within the context of: (a) Andrews' and Bonta's psychology of criminal conduct; (b) the incompatibility of a harm reduction treatment model with an abstinence-based parole decision-making model; (c) changing drug use profiles among MMT clients; (d) a strength-based approach to correctional intervention focusing on educational and vocational retraining initiatives; and (e) creation of a user friendly case-based screening algorithm for prediction of release outcome for new releases.

Keywords: prediction
methadone
case based algorithm prediction of release outcome
maintenance treatment outcome forensic parole Correctional Service Canada urinalysis logistic regression AUC ROC predictor variables
treatment efficacy
risk
recidivism
classification
accuracy
offenders
illicit
opioid
revocation
harm
reduction
treatment
responsivity
Canada
logistic
regression
auc
roc
efficacy
institutional
Advisor: Stermac, Lana
Measurement of High-Q2 Neutral Current Cross-sections with Longitudinally Polarised Positrons with the ZEUS Detector

The cross sections for neutral current (NC) deep inelastic scattering (DIS) in e+p collisions with a longitudinally polarised positron beam are measured at high momentum transfer squared (Q2 > 185 GeV2) at the ZEUS detector at HERA. The HERA accelerator provides e+-p collisions at a centre-of-mass energy of 318 GeV, which allows the weak contribution to the NC process to be studied at high Q2. The measurements are based on a data sample with an integrated luminosity of 135.5 pb-1 collected with the ZEUS detector in 2006 and 2007. The single differential NC cross sections dsigma/dQ2, dsigma/dx and dsigma/dy and the reduced cross section are measured. The structure function xF3 is determined by combining the e+p NC reduced cross sections with the previously measured e-p measurements. The interference structure function xF 3^gamma,Z is extracted at Q2 = 1500 GeV2. The cross-section asymmetry between the positive and negative polarisation of the positron beam is measured and the parity violation effects of the electroweak interaction are observed. The predictions of the Standard Model of particle physics agree well with the measurements.

Keywords: Deep Inelastic scattering
DIS
neutral current
NC
electroweak
SM
High energy physics
positron
proton
structure function
physics
cross section
longitudinally polarised
lepton
Advisor: Martin, John