VictorJuiz/thesis huggingface dataset:
Linear-time invariant Positive Systems: Stabilization and the Servomechanism Problem
Keywords: positive systems
positive stabilization
positive servomechanism problem
tracking and disturbance rejection
tuning clamping regulators
LQR and MPC optimal control

Positive systems, which carry the well known property of confining the state, output, and/or input variables to the nonnegative orphant, are of great practical importance, as the nonnegative property occurs quite frequently in numerous applications and in nature. These type of systems frequently occur in hydrology where they are used to model natural and artificial networks of reservoirs; in biology where they are used to describe the transportation, accumulation, and drainage processes of elements and compounds like hormones, glucose, insulin, and metals; and in stocking, industrial, and engineering systems where chemical reactions, heat exchanges, and distillation processes take place. The interest of this dissertation is in two key problems: positive stabilization and the positive servomechanism problem. In particular, this thesis outlines the necessary and sufficient conditions for the stabilization of positive linear time-invariant (LTI) systems using state feedback control, along with providing an algorithm for constructing such a stabilizing regulator. Moreover, the results on stabilization also encompass the two problems of the positive separation principle and stabilization via observer design. The second, and most emphasized, problem of this dissertation considers the positive servomechanism problem for both single-input single-output (SISO) and multi-input multi-output (MIMO) stable positive LTI systems. The study of the positive servomechanism problem focuses on the tracking problem of nonnegative constant reference signals for unknown/known stable SISO/MIMO positive LTI systems with nonnegative unmeasurable/measurable constant disturbances via switching tuning clamping regulators (TcR), linear quadratic clamping regulators (LTQcR), and ending with MPC control. Finally, all theoretical results on the positive servomechanism problem are justified via numerous experimental results on a waterworks system.
Bibliofictions: Ovidian Heroines and the Tudor Book
Keywords: Ovid
Tudor
Early Modern
Renaissance
Late Medieval
Print Culture
Book History
querelle des femmes
epistolary
Elizabethan
Henrician
metamorphosis
Classical Tradition
De Worde, Wynkyn
Caxton, William
Daniel, Samuel
Chaucer, Geoffrey
Shakespeare, William
Drayton, Michael
Whitney, Isabella
Skelton, John

This dissertation explores how the mythological heroines from Ovid‘s Heroides and Metamorphoses were cataloged, conflated, reconceived, and recontextualized in vernacular literature; in so doing, it joins considerations of voice, authority, and gender with reflections on Tudor technologies of textual reproduction and ideas about the book. In the late medieval and Renaissance eras, Ovid‘s poetry stimulated the imaginations of authors ranging from Geoffrey Chaucer and John Gower to Isabella Whitney, William Shakespeare, and Michael Drayton. Ovid‘s characteristic bookishness—his interest in textual revision and his thematization of the physicality and malleability of art in its physical environments—was not lost upon these postclassical interpreters who engaged with his polysemous cast of female characters. His numerous English protégés replicated and expanded Ovid‘s metatextual concerns by reading and rewriting his metamorphic poetry in light of the metaphors through which they understood both established networks of scribal dissemination and emergent modes of printed book production. My study of Greco-Roman tradition and English bibliofictions (or fictive representations of books, their life cycles, and the communication circuits in which they operate) melds literary analysis with the theoretical concerns of book history by focusing on intersections and interactions between physical, metaphorical, and imaginary books. I posit the Tudor book as a site of complex cultural and literary negotiations between real and inscribed, historical and fictional readers, editors, commentators, and authors, and, as my discussion unfolds, I combine bibliographical, historical, and literary perspectives as a means to understanding both the reception of Ovidian poetry in English literature and Ovid‘s place in the history of books. This dissertation thus contributes to a growing body of book history criticism while also modeling a bibliographically enriched approach to the study of late medieval and Renaissance intertextuality.
Greater Toronto Area Urban Heat Island: Analysis of Temperature and Extremes
Keywords: Urban heat island
Climate change in cities
Trend analysis
Greater Toronto Area

This study analyzes the trends in temperature, and their extremes, in the Greater Toronto Area (GTA) in the context of urban heat island. The trends in annual and seasonal temperature changes were investigated in the GTA over the past century and a half with special focus on 1970-2000. The Mann-Kendall test is used to assess the significance of the trends and the Theil-Sen slope estimator is used to identify their magnitude. Statistically significant increasing trends for mean and minimum temperatures are observed mainly at the urban and suburban stations. The sequential Mann-Kendall test is used to identify any abrupt change in the time series of temperature (31 -161 years), and the results indicate that increasing trend for annual mean temperature has started after 1920 at Toronto downtown, after the 1960s at the suburban stations, and has increased significantly during the 1980s at all stations, which is consistent with the pace of urbanization during these periods in the GTA. The observed urban heat island (UHI) in Toronto is quantified and characterized by considering three different rural stations. The UHI intensity (∆Tu-r) in Toronto is categorized as winter dominating or summer dominating depending on the choice of a rural station. The results from the trend analysis of annual and seasonal ∆Tu-r suggest that the choice of the rural station is crucial in the estimation of ∆Tu-r, and thus can overestimate or underestimate its prediction depending on the location and topographical characteristics of a rural station relative to the urban station. The trends in extreme temperature indices are also investigated and the results indicate that indices based on daily maximum temperature are more pronounced at the urban and suburban stations compared to that at the rural stations. The changes in the trends for extreme indices based on daily minimum temperature are consistent at all stations for the period of 1971-2000. With the decrease in the percentage of cold nights and the increase in the percentage of warm nights, the diurnal temperature range has decreased throughout the GTA region. The analysis of heating degree days and cooling degree days revealed that the former is associated with decreasing trends and the latter exhibited increasing trends at almost all stations in the GTA. Finally, it is evident from the results that urban heat island phenomenon exerts warmer influence on the climate in cities, and with the current pace of urbanization in the GTA, it is imperative to understand the potential impact of the emerging UHI on humans and society.
Characterization of Peripherin Isoforms in Amyotrophic Lateral Sclerosis
Keywords: Amyotrophic Lateral Sclerosis (ALS)
Isoforms
alternative translation
aggregation

Peripherin is a type III intermediate filament protein that is predominately expressed in the peripheral nervous system and in subsets of efferent projections in the central nervous systems. While the exact role of peripherin remains unclear, it is found upregulated after traumatic neuronal injury and in the devastating neurodegenerative disease amyotrophic lateral sclerosis (ALS). Interestingly, peripherin overexpressing transgenic mice succumb to motor neuron disease with pathological hallmarks reminiscent of those found in ALS. Pathological peripherin abnormalities occur with high frequency in both familial and sporadic forms of ALS, with peripherin found associated with the majority intracellular inclusions present within degenerating motor neuron populations. The findings of peripherin mutations in sporadic ALS have reinforced the importance of peripherin as a prospective etiological or propagative factor of disease pathogenesis. Surprisingly, inherited peripherin gene mutations have not been identified; as such, understanding the post-transcriptional mechanism at which peripherin imparts its effect(s) is considered a key goal and represents a pathological point-of-convergence for an otherwise complex, multifaceted disease. Prior to the commencement of this work, our group identified the presence of an abnormal peripherin alternative splice variant upregulated in ALS. In doing so, we consistently observed the presence of a second peripherin species of ~45 kDa on immunoblots of cell lysates derived from full-length peripherin transfections. Here, we identified this protein as a constitutively expressed isoform, termed Per-45, that arises from alternative translation and that is required for normal filament assembly: changes to the normal isoform expression pattern are associated with malformed filaments and intracellular inclusions. In lieu of the possibility of distinct peripherin intra-isoform associations, we identified isoform-specific expression and ratio changes in traumatic neuronal injury, in mouse models of motor neuron disease, and in ALS. Finally, we explored the interrelationships between peripherin isoform expression, protein aggregation, and neuritic outgrowth by linking these phenotypes with major pathogenic features associated with ALS, including in vitro models of oxidation, glutamate excitotoxicity, and neuroinflammation. Overall, this thesis provides exciting new insight into our knowledge of basic IF biology and the role of peripherin isoforms in injury and in motor neuron disease.
'Just Act Naturally': A Poetics of Documentary Performance
Keywords: Documentary Film
Performance
Self-Presentation

This dissertation formulates a poetics of performance in nonfiction film and television. Building on a large body of converging research that calls for an acknowledgment of: the constructedness of documentary texts; the performative nature of identity; and the significance of screen performance, I illustrate the way in which documentary subjects must finally be seen as creative agents who (consciously or not) play a significant role in determining the meanings, functions, and effects of the films in which they appear. A first chapter lays the groundwork for this discussion, setting out a means of understanding and investigating the documentary performer’s work. It is argued that nonfiction performance is a three-tiered process, wherein everyday performative activity (tier #1) is shaped by and often tailored to the camera (tier #2) within specific nonfiction film frameworks (tier #3). In addition to providing a flexible and generally applicable model of what the nonfiction subject’s work entails, this conceptualization suggests an appropriate means of analysing individual documentary performances, indicating the necessity of attending to the way in which twice modified everyday self-presentational tools serve as signifiers in any given nonfiction text. Subsequent chapters turn from the issue of what nonfiction performance involves to a consideration of what it accomplishes. Drawing from scholarship devoted to each of the three levels of the documentary ‘social actor’s’ work, I posit three major functions for nonfiction performance. Chapter 2 demonstrates the way in which the individuals who appear in documentaries play a significant role in the construction of ‘characters’, which, in turn, exert an indelible influence on the meaning(s) of the texts in which they figure. Chapter 3 argues that nonfiction performance helps to bolster and/or to destabilize normative understandings of identity categories such as gender, sexuality, age, ethnicity, race, class and dis/ability. Finally, the concluding chapter discusses the way in which documentary performers help to invite affective reactions from spectators, and – in so doing – contribute significantly to nonfiction texts’ ability to effectuate social change. Detailed analyses of a wide range of documentaries provide support for these contentions.
'Hast Thou Been Tampering?' Adaptive Dramaturgy and Richard III
Keywords: dramaturgy
adaptation

Shakespeare’s Richard III is the most often performed history play within the western dramatic canon, yet at the end of the seventeenth century it was considered virtually unplayable. The extensive textual alteration undertaken by comedian Colley Cibber in 1700 revived interest in the rarely performed play, and actor David Garrick’s adoption of Cibber’s text in 1744 ensured the work’s popular survival. Regular performance and textual revision throughout the eighteenth century positioned Cibber’s adaptation as one of the most well-known works on the London stages, and by the time Henry Irving permanently restored Shakespeare’s text to the popular repertoire in 1877, Cibber’s adaptation had served as a conduit to restoring Richard III from its “virtually unplayable” position to its lost Elizabethan fame. The adaptive development of Richard III from unplayable to indispensable can be tracked dramaturgically, from Shakespeare’s Quarto (1597) and Folio (1623) to Cibber’s version, eighteenth- and nineteenth-century performative adaptations, and twentieth century film realisations. Through parallel-text analysis of the prompt-scripts of some of the most notorious, iconic, and effective adaptations of the play, this study examines in a practical sense the dramaturgical drive present throughout the play’s varied life-span: often changing, but nevertheless a constant product. The negative stigma attached to adaptation – characterised in Cibber’s words as “tampering” – is examined throughout the performative history of Richard III. Chapter one considers theoretical perspectives on adaptation studies, and adopts Gérard Genette’s evocative “transtextuality” discourse to quantify conclusions to emerge from parallel comparison of texts. Chapter two analyses Cibber’s process of “re-visioning” Shakespeare’s play; Chapter three examines the impact of performative adaptation on six different stage editions of Richard III. Chapter four addresses the transitional process of developing a stage-bound text on film through the screenplay format, and Chapter five demonstrates the use of cinematic visualisation on the text. Finally, Chapter six tracks the impact of adaptation on the survival and perpetuation of texts over successive generations and throughout varied cultures and contexts. Through analysis of fourteen different performance editions, prompt-books, film texts, and unpublished manuscripts, this dissertation considers the validity of “tampering” on the adaptive process.
Regge Calculus as a Numerical Approach to General Relativity
Keywords: Numerical Relativity
Regge Calculus

A (3+1)-evolutionary method in the framework of Regge Calculus, known as "Parallelisable Implicit Evolutionary Scheme", is analysed and revised so that it accounts for causality. Furthermore, the ambiguities associated with the notion of time in this evolutionary scheme are addressed and a solution to resolving such ambiguities is presented. The revised algorithm is then numerically tested and shown to produce the desirable results and indeed to resolve a problem previously faced upon implementing this scheme. An important issue that has been overlooked in "Parallelisable Implicit Evolutionary Scheme" was the restrictions on the choice of edge lengths used to build the space-time lattice as it evolves in time. It is essential to know what inequalities must hold between the edges of a 4-dimensional simplex, used to construct a space-time, so that the geometry inside the simplex is Minkowskian. The only known inequality on the Minkowski plane is the "Reverse Triangle Inequality" which holds between the edges of a triangle constructed only from space-like edges. However, a triangle, on the Minkowski plane, can be built from a combination of time-like, space-like or null edges. Part of this thesis is concerned with deriving a number of inequalities that must hold between the edges of mixed triangles. Finally, the Raychaudhuri equation is considered from the point of view of Regge Calculus. The Raychaudhuri equation plays an important role in many areas of relativistic Physics and Astrophysics, most importantly in the proof of singularity theorems. An analogue to the Raychaudhuri equation in the framework of Regge Calculus is derived. Both (2+1)-dimensional and (3+1)-dimensional cases are considered and analogues for average expansion and shear scalar are found.
"Tears of Compunction": French Gothic Ivories in Devotional Practice
Keywords: Ivory
Medieval Art
Prayer
Trade Routes
Connoisseurship
Style
France
Thirteenth Century
Canons
Picardy
Paris
Spiritual Exercises
Private Devotion

This dissertation presents a new perspective on the function of objects in late-medieval devotional practice through a study of the so-called Soissons group of thirteenth-century French Gothic ivories. These ivory diptychs were sophisticated tools constructed to guide the user through various spiritual exercises that led to prayer. The hitherto unexplained increase in the availability of ivory in mid-thirteenth-century France is accounted for by an alteration in the trade routes that brought elephant tusks from the Swahili coast of Africa to northern Europe: a newly-opened passage through the Straits of Gibraltar allowed a small amount of luxury goods to be shipped together with bulk materials necessary to the northern textile industries. The increasing supply required a revision of the structure of the thirteenth-century craft of ivory. The Soissons group, the first ivory diptychs fashioned during this time of growth in ivory markets, is subdivided into two sections. An itinerant master who traveled throughout the Picard region between 1235 and 1270 crafted the first group. Concurrently, three separate Parisian artists produced the second group based on a Picard model. This dissertation redates all the ivories substantially earlier than previously thought, conclusions which were attained through stylistic analysis. The dense Passion iconography shaped the diptychs’ function in private devotion. The narrative encouraged the viewer to practice a number of spiritual exercises—reading, memorization and compunction—analogous to the three reasons for allowing images in the Christian Church, the triplex ratio. The Passion diptych format introduced with these objects was immensely popular throughout the thirteenth and fourteenth centuries and its conservation over time underscored its effectiveness. The small differences in iconography and composition among the seven Soissons diptychs, however, were subtle modifications to adjust to different audiences and to hone the objects’ efficacy as tools for prayer.
Age-related Changes In Emotion Regulation Using A Startle Modulation Paradigm
Keywords: emotion regulation
aging
startle modulation

Lifespan theories of emotion suggest that the ability to regulate emotion improves with age. The supporting evidence, however, is indirect: older adults pay less attention to negative events, remember less negative information, and report fewer experiences of negative emotion. Few studies directly measure emotion regulation by explicitly instructing older adults to modulate their feelings while exposed to emotion-evoking stimuli. The purpose of this thesis was to directly compare younger and older adults in their ability to modulate feelings to investigate whether aging results in decline, stability, or improvement in emotion regulation and also to examine potential mechanisms underlying regulation skills. The study employed a startle modulation paradigm to measure both emotional reactivity and regulation. Two experimental tasks (Stroop colour-word interference, reversal learning) were also administered to explore the relationship between emotion regulation and two theoretically-relevant processes: (a) cognitive control and (b) modification of learned emotional associations. There were three main findings: (1) emotional reactivity was preserved in older adults. Both age groups showed emotion-modulated startle (negative > neutral) during the pre-regulation viewing period; (2) age-related decline in emotion regulation was evident on an objective measure of emotion regulation (startle eyeblink reflex) but not on a subjective measure (self-ratings). Specifically, for older adults, startle eyeblink was not enhanced or attenuated following increase and decrease instructions, respectively. In contrast, both groups showed similar modulation of valence and arousal ratings by regulation instruction (increase > look > decrease); (3) for older adults, reversal learning performance correlated positively with the degree of reappraisal-related startle attenuation in the decrease condition, suggesting a possible mechanism for impaired down-regulation. These findings suggest that even when emotional reactivity is similar, older adults are less effective at modulating their physiological responses.
The Operatic Imperative in Anglo-American Literary Modernism: Pound, Stein, and Woolf
Keywords: modernism
opera

It is generally agreed that modernism is a period and movement rich in interdisciplinary collaboration. What is often contentious in understandings of the modernist period is to whom modernist artists addressed their projects. On the one hand, traditional scholarship has tended to view modernism as an essentially elitist project practiced among a closed set orbiting around British and American expatriate coteries: Ezra Pound and his “Ezuversity,” Stein and her Paris Salon, Woolf and the Bloomsbury circle. On the other hand, recent scholarship in modernism has sought to expand the field to included modernisms practiced in different time periods, in different countries, and by a wider range of artists. While my project is firmly situated in the work of the so-called high modernists, my operatically focused approach, which sees Pound, Stein, and Woolf engaging directly with mass culture by way of opera (albeit in different ways and to different aims), suggests that we need to re-think the way in which we have mythologized the period, even where these “high” modernists are concerned. In chapter one, I read Pound’s operatic endeavors as alternative means of translation. Though these pedagogical projects valorize the art they “translate” for its unique difficulty, the use of opera and later, radio opera, as the means to translate this art demonstrates an interest in democratizing this difficulty. This is a remarkable inconsistency given Pound’s undisputedly fascist allegiances. Chapter two, which focuses on Stein’s Four Saints in Three Acts, shows how the prospect of writing an opera helped Stein to forge a new connection between playwright and audience in the theatre. What I am calling the “envoiced landscape” is an anti-patriarchal, enabling alternative to teleologically driven narrative that defeats authorial control by way of play. Chapters three and four turn to Woolf’s conspicuously hybrid novels, The Waves and Between the Acts. Both works question the nineteenth-century notion of music’s capacity to transcend language, embracing instead a distinctly operatic frame of reference, as Woolf celebrates the novel as an omnivorous but democratic, open-ended, contingent form, endlessly capable of incorporating and co-opting other genres. Whereas The Waves enacts a critique of the Gesamtkunstwerk played out on the Wagnerian stage, Between the Acts considers the social text played out among opera’s audiences, positing, then critiquing, a Brechtian reevaluation of Wagnerian aesthetics.