A new approach to the absolute measurement of two-dimensional optical path differences is presented in this thesis. The method, which incorporates a white light interferometer and a hyperspectral imaging system, is referred to as Hyperspectral Interferometry. A prototype of the Hyperspectral Interferometry (HSI) system has been designed, constructed and tested for two types of measurement: for surface profilometry and for depth-resolved displacement measurement, both of which have been implemented so as to achieve single shot data acquisition. The prototype has been shown to be capable of performing a single-shot 3-D shape measurement of an optically-flat step-height sample, with less than 5% difference from the result obtained by a standard optical (microscope) based method. The HSI prototype has been demonstrated to be able to perform single-shot measurement with an unambiguous 352 (m depth range and a rms measurement error of around 80 nm. The prototype has also been tested to perform measurements on optically rough surfaces. The rms error of these measurements was found to increase to around 4× that of the smooth surface. For the depth-resolved displacement field measurements, an experimental setup was designed and constructed in which a weakly-scattering sample underwent simple compression with a PZT actuator. Depth-resolved displacement fields were reconstructed from pairs of hyperspectral interferograms. However, the experimental results did not show the expected result of linear phase variation with depth. Analysis of several possible causes has been carried out with the most plausible reasons being excessive scattering particle density inside the sample and the possibility of insignificant deformation of the sample due to insufficient physical contact between the transducer and the sample.

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This essay is an investigation of transnational author Joseph Conrad’s engagement with issues of cultural liminality during the years around the turn of the 20th century. Through an examination of Almayer from Almayer’s Folly, Yanko of “Amy Foster”, and Cornelius from Lord Jim, the common experience of cultural displacement is considered. Conrad placed these three culturally liminal characters in various, carefully constructed social environments. Thus far, these characters have been under investigated in the critical literature, particularly the mixed-culture Almayer and Cornelius. By investigating these three characters and their environments, this essay demonstrates how Conrad depicts cultural displacement in the age of nationalism to be increasingly multifaceted but inevitably disastrous. The essay further reveals the need for more careful critical assessments of the cultural nuances of Conrad’s characters.

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This dissertation examines contemporary Iraqi North American women’s life narratives within the frame of postcolonial autobiography theory. Through narrating their experiences of oppression, war, and displacement these women reveal the fragmentation of identity that occurs under such unsettling situations. However, I argue that in the course of narrating their stories and in spite of the fragmentation they suffer, these women are able to establish selves that distinguish and recover from fragmentation and loss through a process I term defragmentation. They are able to defragment their identities by reconstructing unique selves through the act of life narration, through relational remembering, and finally by resisting patriarchal and Western influences on how they perceive themselves and their experiences. Thus they are able to defragment their sense of disjointedness and reaffirm their sense of Iraqiness, even in the diaspora. This study explores the major causes of fragmentation in the work, which are divided into trauma and displacement. Unlike the studies and statistics that political approaches and media coverage have provided, these works shed light on the disruptions caused by war, oppression, separation from loved ones, and exile in the daily lives of these narrators or the lives of their friends and relatives. Therefore, in addition to the new identity that these women create in order to cope with their new lives in the West, they also construct a hybrid identity that is capable of recollecting and narrating these traumatic experiences. Within the space of hybridity, Iraqi North American women have to deal with vast differences between Western and Middle Eastern cultures; the transformation entails not just a change of place but an acceptance or understanding of a new culture, a new religion, and a new identity. The struggle of settlement, or re-settlement, becomes that of establishing an identity that does reflect the stereotypical images of Middle Eastern women in Western perceptions and a struggle to maintain selves that can contain both the past life and the present in what can be considered a third space. Although the main topic of this dissertation is defragmentation in the life narrations of Iraqi North American women, this study also covers the cultural and political history of Arabs in general, and of Iraqis specifically. There are also references to the migrations of Arabs to North America and a brief background of the roots of Arab North American literature. These topics will be discussed in order to provide an understanding of the histories from which these women, or their families, have migrated and their positions within Western culture and scholarship. In addition, this approach provides an insight into the complexities of these women’s identities that reflect multi-layered affiliations, interests, and cultures. The works chosen for this study include written and oral life narratives by Iraqi North American women who write from Canada and the United States. These works are Zaineb Salbi’s Between Two Worlds: Escape From Tyranny: Growing Up in the Shadow of Saddam (2005), Dunya Mikhail’s A Diary of a Wave Outside the Sea (2009) and a National Film Board documentary titled Baghdad Twist (2007), by Jewish Iraqi Canadian Joe Balass. In the documentary, Joe Balass interviews his mother, Valentine Balass, as she recounts growing up in Iraq and later experiencing exile from her homeland. The final work I address is The Orange Trees of Baghdad: In Search of My Lost Family (2007) by Leilah Nadir, a Canadian born Iraqi writer. Through her memoir Nadir tries to reconnect with her father’s family in Iraq while uncovering their traumatic experiences of the Gulf War. The narrators in my research belong to different social classes, age groups, and practice different religions, but they all identify themselves as Iraqi women. These women, through their interpretations of living life between two (or more) cultures, offer important perspectives not only on their own ethnic society, but also on the role of ethnic women in North American society in general. There has been a massive increase in the migration of Iraqi women to North America in the last thirty years; their perspectives on political, social, and religious changes are an important part of understanding the experiences of this ethnic group. Through their life narratives, these women are able to display their unique selves by portraying their ability to contest the boundaries and limitations of borders and societies that try to eliminate one identity or the other.

From the eighth to the fourteenth century, places of wonder and dread appear in a wide variety of genres in Old and Middle English: epics, lays, romances, saints’ lives, travel narratives, marvel collections, visions of the afterlife. These places appear in narratives of the other world, a term which in Old and Middle English texts refers to the Christian afterlife: Hell, Purgatory, even Paradise can be fraught with wonder, danger, and the possibility of harm. But in addition to the other world, there are places that are not theologically separate from the human world, but that are nevertheless both marvellous and horrifying: the monster-mere in Beowulf, the Faerie kingdom of Sir Orfeo, the demon-ridden Vale Perilous in Mandeville’s Travels, or the fearful landscape of the Green Chapel in Sir Gawain and the Green Knight. Fraught with horror or the possibility of harm, these places are profoundly different from the presented or implied home world of the text. My dissertation investigates how Old and Middle English narratives create places of wonder and dread; how they situate these places metaphysically between the world of living mortals and the world of the afterlife; how they furnish these places with dangerous topography and monstrous inhabitants, as well as with motifs, with tropes, and with thematic concerns that signal their marvellous and fearful nature. I argue that the heart of this poetics of marvellous spaces is displacement. Their wonder and dread comes from boundaries that these places blur and cross, from the resistance of these places to being known or mapped, and from the deliberate distancing between these places and the home of their texts. This overarching concern with displacement encourages the migration of iconographic motifs, tropes, and themes across genre boundaries and theological categories.

An electrostatic actuator driven by conventional voltage control and charge control requires high actuation voltage and suffers from the pull-in phenomenon that limits its operation range, much less than its entire gap. To provide effective solutions to these problems, we present complete analytical and numerical models of various electrostatic actuators coupled with resonant drive circuits that are able to drive electrostatic actuators at much lower input voltage than that of conventional actuation methods and to extend their operation range beyond their conventional pull-in points in the presence of high parasitic capacitance. Moreover, in order to validate the analytical and numerical models of various electrostatic actuators coupled with the resonant drive circuits, we perform the experiment on the microplate and the micromirror coupled with the resonant drive circuit. For instance, using a high voltage amplifier, we manage to rotate the micromirror with sidewall electrodes by 6 ° at 180 V. However, using the resonant drive circuit, we are able to rotate the same micromirror by 6 ° at much lower input voltage, 8.5 V. In addition, the presented work also facilitates the stability analysis of electrostatic actuators coupled with the resonant drive circuits and provides how the effect of the parasitic capacitance can be minimized. For example, the resonant drive circuit placed within a positive feedback loop of a variable gain amplifier is able to extend the operation range much further even in the presence of very high parasitic capacitance. The resonant drive circuit with the proposed feedback controllers is also able to minimize the detrimental effects of the parasitic capacitance and to displace a parallel-plate actuator over its entire gap without the saddle-node bifurcation. Finally, we present a new displacement measurement method of electrostatic actuators coupled with the resonant drive circuits by sensing the phase delay of an actuation voltage with respect to an input voltage. This new measurement method allows us to easily implement feedback control into existent systems employing an electrostatic actuator without any modification or alteration to the electrostatic actuator itself. Hence, this research work presents the feasibility of electrostatic actuators coupled with the resonant drive circuit in various industrial and medical applications, in which the advantages of miniaturization, low supply voltage, and low power consumption are greatly appreciated.

This study is an evaluation on the seismic behavior of the Nahrain Dam, which is located in Khorasan province in the central part of Iran. The finite element method is used for the dynamic analysis of the dam. Using a slope stability computer program, the critical slip surface near the crest of the dam and the yield acceleration corresponding to this slip surface are determined. Static analysis was completed by using the finite element computer program SAP90 and SAP2000 in order to determine the stress conditions within the body of the dam prior to earthquake. The stresses obtained from this analysis were used in the assessment of the dynamic material properties of the dam. Two near by actual earthquakes were modified and used as input motions of different magnitudes. At the next step, the harvested data was used as input data for the program TELDYN to perform dynamic analysis. Permanent displacements under the scenario base motions were calculated by using the Newmark&rsquo / s method.

The main objective of this study is to model the three dimensional surface cracking problem in Functionally Graded Material (FGM) coatings bonded to homogeneous substrates. The FGM coating is assumed to be a (ZrO2) &ndash / (Ti-6Al-4V) layer. Homogeneous ceramic, metal &ndash / rich, ceramic &ndash / rich and linear variation material compositions are considered in the analyses. The surface crack is assumed to have a semi &ndash / circular crack front profile. The surface crack problem in the FGM coating &ndash / substrate system is examined under mechanical and transient thermal loading. Structural and thermal problems are modeled using three dimensional finite elements. Strain singularity around the crack front is simulated using collapsed 20 &ndash / node quarter &ndash / point brick elements. Three - dimensional displacement correlation technique is utilized to extract the stress intensity factors. The main results of the study are the stress intensity factors around the crack front for FGM coating - substrate structures subjected to uniform tension, bending, fixed &ndash / grip tension, three point bending and transient thermal loading.

Single-particle tracking (SPT) is a method used to study the diffusion of various molecules within the cell. SPT involves tagging proteins with optical labels and observing their individual two-dimensional trajectories with a microscope. The analysis of this data provides important information about protein movement and mechanism, and is used to create multistate biological models. One of the challenges in SPT analysis is the variety of complex environments that contribute to heterogeneity within movement paths. In this thesis, we explore the limitations of current methods used to analyze molecular movement, and adapt analytical methods used in animal movement analysis, such as correlated random walks and first-passage time variance, to SPT data of leukocyte function-associated antigen-1 (LFA-1) integral membrane proteins. We discuss the consequences of these methods in understanding different types of heterogeneity in protein movement behaviour, and provide support to results from current experimental work. / Applied Mathematics