VictorJuiz/thesis huggingface dataset:
Applications of Generic Interpolants In the Investigation and Visualization of Approximate Solutions of PDEs on Coarse Unstructured Meshes
Keywords: partial differential equations
unstructured meshes
scattered data interpolation
contour lines and level sets
adaptive mesh refinement
error estimation

In scientific computing, it is very common to visualize the approximate solution obtained by a numerical PDE solver by drawing surface or contour plots of all or some components of the associated approximate solutions. These plots are used to investigate the behavior of the solution and to display important properties or characteristics of the approximate solutions. In this thesis, we consider techniques for drawing such contour plots for the solution of two and three dimensional PDEs. We first present three fast contouring algorithms in two dimensions over an underlying unstructured mesh. Unlike standard contouring algorithms, our algorithms do not require a fine structured approximation. We assume that the underlying PDE solver generates approximations at some scattered data points in the domain of interest. We then generate a piecewise cubic polynomial interpolant (PCI) which approximates the solution of a PDE at off-mesh points based on the DEI (Differential Equation Interpolant) approach. The DEI approach assumes that accurate approximations to the solution and first-order derivatives exist at a set of discrete mesh points. The extra information required to uniquely define the associated piecewise polynomial is determined based on almost satisfying the PDE at a set of collocation points. In the process of generating contour plots, the PCI is used whenever we need an accurate approximation at a point inside the domain. The direct extension of the both DEI-based interpolant and the contouring algorithm to three dimensions is also investigated. The use of the DEI-based interpolant we introduce for visualization can also be used to develop effective Adaptive Mesh Refinement (AMR) techniques and global error estimates. In particular, we introduce and investigate four AMR techniques along with a hybrid mesh refinement technique. Our interest is in investigating how well such a `generic' mesh selection strategy, based on properties of the problem alone, can perform compared with a special-purpose strategy that is designed for a specific PDE method. We also introduce an \`{a} posteriori global error estimator by introducing the solution of a companion PDE defined in terms of the associated PCI.
Biases in Looking Behaviour during Visual Decision Making Tasks
Keywords: decision making
eye movements
attention
gaze bias

In four experiments we used eye-tracking to investigate biases in looking behaviour during visual decision making tasks. In Experiment 1, participants viewed arrays of images of photographic art and decided which image was preferred (from a set of either two or eight alternatives). To analyze gaze behaviour during the decision we identified dwells (where a dwell is a series of consecutive fixations on a decision alternative). This analysis revealed two forms of gaze bias in the period prior to the response. Replicating prior findings (Shimojo, Simion, Shimojo, & Scheier, 2003), just prior to the response we found an increase in the frequency of dwells on the chosen item. In addition, throughout the decision, dwells on the chosen item were longer than dwells on other items. This pattern of biases was extremely similar across preference and non-preference decision instructions, but overall the biases were more pronounced in eight alternative decisions than in two alternative decisions. In Experiment 2 we manipulated the number of decision alternatives while controlling for differences in the stimulus displays. Participants viewed displays containing six everyday items, and chose either which of two sets of three items was the most expensive (two alternative set selection task) or which of the six items was the most expensive (six alternative item selection task). Consistent with Experiment 1, participants exhibited greater selectivity in their processing of stimulus information in the six alternative decisions compared to the two alternative decisions. In Experiments 3 and 4 we manipulated stimulus exposure in order to test predictions derived from the Gaze Cascade model (Shimojo et al., 2003). In Experiment 3, participants performed an eight alternative decision in which four of the items had been pre-exposed prior to the decision. In Experiment 4, stimulus exposure was manipulated during the ongoing decision using a gaze-contingent methodology. While these manipulations of stimulus exposure had strong effects on gaze bias, the specific predictions of the model were not supported. Rather, we suggest an interpretation based on prior research, according to which the gaze bias reflects the selective processing of stimulus information according to its relevance to the decision task.
"All in the Same Boat": An Analysis of a Support Group for Children of Parents with Mental Illnesses
Keywords: mental health
parental mental illness
children
adolescence
qualitative methods
critical dramaturgy
ethnography
mental health services
support group
prevention
psychiatric disability
early intervention
discourse analysis
Goffman
mental health literacy
emotion

The effectiveness of psychoeducation and peer support programs for children of mentally ill parents is frequently measured by demonstrating children’s ability to meet program goals according to pre-defined categories determined by adults. Little is known about how children respond to these goals, whether they share them, and how, or if, their needs are met. I conducted an ethnographic study of one such group for school-aged children. I examined how specific discourses framed the content of the program manual designed to educate and support children and I observed how children responded to the program. My study is rooted in Goffman’s (1959) dramaturgical analyses of the reciprocal influence individuals have on one another in face-to-face encounters. From a critical dramaturgical perspective the participants were expected to conform to behavioural expectations of the setting, itself framed by broader arenas of interaction in which shared institutionalized meanings govern (often idealized) presentations of self. Data collection included: 1. a critical discourse analysis of the program manual; 2. participant observation of interactions during the eight-week program; and 3. children’s evaluations of the program in a separate group interview. Being identified as “as all in the same boat” was meaningful and consequential for children who were expected to learn mental health/illness information because, “knowledge is power”, and to express difficult feelings about being a child of a mentally ill parent. Children could be said to have achieved the goals of the program because they developed a mutual understanding about how to interpret and give meaning to their circumstances; “recognizing” unpredictable behaviours as signs of illness and becoming responsible for managing only how “their own story would go”. Children were not expected to care for ill parents, even when they wanted some responsibility, and were strongly discouraged from turning to friends for support. Children strategized to negotiate and resist group expectations and challenge assumptions about being “all in the same boat”. Suggestions are made for determining what constitutes “good” mental health literacy based on children’s preferences for explaining their circumstances in ways they find relevant and for supporting children’s competencies to manage relationships that are important to them.
Children's Scripts for Peer Conflict During the Transition to School
Keywords: conflict
scripts
children
school

Scripts for peer conflict were examined in a sample of 55 four- and five-year-old children. Children provided a full sequential report of the conflict strategies used in six hypothetical peer conflict situations involving disputes over possessions. Interviews were conducted at two time points (early and late) during the children’s first year of school. Scripts were studied at two different analytical levels examined separately in two manuscripts: in the first manuscript, conflict scripts were examined at the group level to reveal general patterns across the participants. The second manuscript explored individual differences in children’s conflict scripts by identifying subgroups of children on the basis of how their scripts unfolded from beginning to end. Analyses in the first manuscript offered support for the stability of children’s scripts across situations. Findings suggested that children internally represent the sequential unfolding of conflict. In particular, their scripts became more constructive as conflicts progressed towards termination, a pattern that was especially apparent later in the school year. As well, analysis of if-then contingencies within scripts revealed that problem solving (e.g., offering to share or negotiate) was perceived by children to de-escalate hostility in conflict, as problem solving was rarely followed by power assertive responses. Averaging actions across conflicts masked specific conflict processes that were captured with sequential analysis of patterns. In the second manuscript, the types of scripts children reported were examined in relation to their receptive language abilities, theory of mind, and social adjustment to school. There was some support for the hypothesis that children whose scripts were constructive (i.e., containing references to problem-solving and conciliation) had better receptive language skills and were more prosocial than children whose scripts were less constructive. Theory of mind was unrelated to children’s ability to represent perspective-taking in their scripts. Directions for future research on children’s conflict scripts are discussed.
Methods for Exploring Heterogeneity in Systematic Reviews of Randomized Controlled Trials
Keywords: heterogeneity
systematic reviews

This thesis consisted of three major components: 1. A sample of randomized controlled trials of herbal medicines was collected and assessed with a recently developed extension of the CONSORT statement for herbal medicine trials. 2. A methodological review of proposed methods of assessing clinical heterogeneity in meta-analyses of randomized controlled trials, 3. The application of permutation based resampling in meta-regression of multiple covariates. An analysis of 406 RCTs of herbal medicine interventions revealed that these trials are regularly under reporting important aspects of the intervention. Next, the second project showed that there are many resources providing suggestions for investigating clinical heterogeneity in systematic reviews of controlled clinical trials and though there is minimal consensus some recommendations are common across sources. Finally, the third project found that permutation tests result in more conservative, larger, p-values potentially reducing the rate of false positive findings when exploring multiple covariates.
Toward a Postmodern Ethnography of Intercultural Theatre: an Instrumental Case-study of the Prague-Toronto- Manitoulin Theatre Project
Keywords: Theatre
Intercultural

This thesis examines collaborative intercultural theatre that brings artists from different parts of the world together to create original work. It includes a case-study of the Prague-Toronto-Manitoulin Theatre Project, a theatrical collaboration that took place between 1999 and 2006 and with which I was involved as a performer and facilitator. The thesis considers the case-study within historical context, particularly in relation to the ideas and experiments of influential twentieth-century practitioner-theorists such as Brecht, Artaud, Brook and Schechner. I distinguish between modernist and postmodernist traditions in intercultural theatre discourse by tracing how the latter arose in response to poststructural arguments in cultural theory. In recent decades, theatre practices have accommodated this redirection by being more mindful of politics and ethics. I argue that approaches to research and analysis have lagged behind, and that alternative approaches are needed that are better suited to address contemporary practices and issues. I borrow from critical traditions in Anthropology, Cultural Studies and Education to build up a postmodern ethnographic approach to my case-study of the Prague-Toronto-Manitoulin Theatre Project. At stake in the case-study is the extent to which the additional contextual knowledge available to a postmodern ethnographic approach contributes to theatrical analysis and interpretation. More concerned with the instrumental value of the case-study than its intrinsic properties, I use the data to demonstrate that a postmodern ethnography is well-suited to consider ethics of representation in an intercultural context, that is, what the possibilities and limitations of dialogue across cultural difference may be. This, I argue, is as important as ever in a world in which intercultural encounter is common and cultural performance circulates with increasing fluidity and ease.
Studies of Laser Ablation of Liquid Water Under Conditions of Impulsive Heat Deposition Through Vibrational Excitations (IHDVE)
Keywords: laser surgery
mass spectrometry

A new laser ablation mechanism of liquid water based on recent insights into its hydrogen bond dynamics has been studied and several applications of the ablation demonstrated. The mechanism, termed as Impulsive Heat Deposition through Vibrational Excitations (IHDVE), is based on the ability of the hydrogen bond network of water to rapidly thermalize vibrational O-H stretch excitations on a time scale of several picoseconds even for excitation intensities that are large enough to bring excited volumes far into the supercritical region. In this way, by using vibrationally resonant picosecond infrared laser pulses with sufficient energy, it is possible to drive ultrafast phase transitions in the excited water volume leading to a rapid and efficient ablation process of water and water rich targets with minimum perturbation of solute molecules of interest. The physics behind the IHDVE ablation process is outlined and the benefits of the IHDVE ablation are demonstrated for two important applications of tissue cutting and mass spectrometry of biomolecules. Finally, the development of two high power infrared laser systems suitable for the practical implementation of IHDVE is presented.
La structure du prédicat verbal : une étude de la construction à double objet en français
Keywords: French
syntax
verbs
argument structure
linguistics
double object construction
applicatives
universal grammar
Minimalism
ditransitives

The present thesis addresses the issue as to why the double object construction (e.g., John gave Mary a book) seems to appear in certain languages but not in others. This construction has received much attention in past research in formal linguistics and has played a central role in developing our understanding of the internal structure of the VP. Previous studies generally define the construction with respect to relative linear order of the object complements of the verb and the lack of morphological markings on these objects. We show that these properties are not inherent to the construction and that consequently, the construction exists in a wider variety of languages than previously assumed, particularly French. Along the lines of Goldberg (1995, 2006), we develop a universal semantic definition of the construction, which may be used as a diagnostic to test, systematically and categorically, its presence across languages. In particular, we identify the double object construction in French as, for example, Jean a donné le livre à Marie. We then explain the cross-linguistic structural differences with a Case-driven approach. Specifically, we argue that the inherent dative Case, present in French but not in English, is responsible for the structural differences recognized between the languages. By adopting a minimalist derivation of argument structure (Chomsky 1995, 2000, 2004) and the applicative analysis (Pylkkänen 2002), we are able to determine the syntax of the construction, while eliminating the redundancies and limitations of previous accounts. We present certain resulting predictions related to the grammar, including a generalisation of Case-checking by the low applicative phrase, a syntactic position related to the direct object properties, and universal properties of the construction itself. In all, this thesis offers empirical evidence for the universality of the double object construction and Case-driven syntactic derivation.
Optical Spectroscopy of Mass-selected Ions in the Gas Phase
Keywords: mass spectrometry
optical spectroscopy
gas-phase
fluorescence
photodissociation
stored ions

Optical spectroscopy combined with mass spectrometry provides a unique opportunity to probe the intrinsic properties of biologically-relevant ions in the gas phase, free from the interfering effects of solvent interactions in the condensed phase. Electrospray ionization allows large biomolecules to be transferred intact into the gas phase for mass analysis. Modern mass spectrometers provide excellent sensitivity, mass-resolution and can efficiently isolate a single ionic species from a complex mixture. However, the extent to which biomolecules retain their solution-phase conformations in the gas phase is largely unknown. Therefore, there is considerable interest in applying spectroscopic methods to biological ions in vacuuo. Due to the low number densities of ions in storage devices, traditional absorption measurements are not feasible, requiring more sensitive analytical methods. Two such techniques are laser-inducedfluorescence (LIF) and photo-dissociation (PD) action spectroscopy, both of which measure the consequence of absorption. The work in this dissertation describes applications of optical spectroscopic methods to interrogate mass-selected ions using a variety of ion storage apparatus including a Fourier transform ion cyclotron resonance mass spectrometer, a quadrupole ion trap and an electrostatic ion storage ring. First, the conformations of small cationized arginine complexes have been investigated using infrared multiple-photon dissociation (IRMPD) action spectroscopy in the IR fingerprint region of the spectrum (200-1800 cm-1). Second, an apparatus incorporating a quadrupole ion trap has been constructed in our laboratory to perform LIF and PD-action spectroscopy. The gas-phase fluorescence and photodissociation properties of three Rhodamine dyes have been investigated including fluorescence excitation and dispersed fluorescence spectra. Finally, the latter chapters describe the use of electronic action spectroscopy to investigate a model chromophore of the green fluorescent protein (GFP), p-hydroxybenzylidene-2,3-dimethylimidazolone (HBDI). The body of work in this dissertation highlights the integration of gas-phase spectroscopy and mass spectrometry to elucidate the fundamental photophysical properties of biological and related ions.
The Kuh-Ke-Nah Broadband Governance Model: How Social Enterprise Shaped Internet Services to Accommodate Indigenous Community Ownership in Northwestern Ontario, Canada (circa 1997 to 2007)
Keywords: broadband
social enterprise
governance
indigenous
community informatics
internet
ecology of games
telecommunications
public private partnerships
Canada

This thesis articulates how the Kuh-Ke-Nah network (K-Net) shaped broadband development in remote indigenous communities. K-Net operates under the not-for-profit stewardship of Keewaytinook Okimanak (KO) Tribal Council. Located in Northwestern Ontario, KO brought K-Net to life amongst its six member First Nations in the mid 1990s. As K-Net evolved and expanded its membership, KO established a governance model that devolves network ownership and control to community networks in partner First Nations. This governance model reflects KO’s use of social enterprise to organize K-Net’s community-based broadband deployment amidst necessary partnerships with government programs and industry players. K-Net’s social enterprise has rapidly grown since 1997, when its core constituents fought for basic telephone service and internet access in Northern Ontario. In the space of less than a decade, K-Net communities have gone from a situation in which it was common for there to be but a single public payphone in a settlement, to a point where over thirty now have broadband internet services to households. Technologies now under K-Net control include a C-Band satellite transponder, IP videoconferencing and telephony, web and email server space, and a variety of terrestrial and wireless links that effectively connect small, scattered First Nations communities to each other and the wider world. K-Net’s governance model encourages member communities to own and control community local loops and internet services under the authority of a local enterprise. Community ownership and control over local loops allows First Nations to collaborate with KO to adapt broadband applications, such as telemedicine and an internet high school, to local challenges and priorities. K-Net’s aggregation of demand from disparate users, within and across member communities, creates economies of scale for the network’s social enterprise, and allows a dynamic reallocation of bandwidth to meet social priorities. Based on four years of research with K-Net stakeholders under the Canadian Research Alliance for Community Innovation and Networking (CRACIN), my thesis documents the evolution of K-Net’s governance model as a reflection of its social enterprise. Drawing from Community Informatics and the Ecology of Games, I trace K-Net’s history and organization to assess how KO, its partners, and K-Net’s constituents, cooperated to make social enterprise viable for member First Nations.