This dissertation explores the utopian and dystopian tones of apocalypticism in medieval secular literature and how literary authors treated the end of time. Beginning with two different representational models of medieval apocalyptic, notably those of St Augustine of Hippo and of Joachim of Fiore, this study examines to what extent selected literary texts adhered to or deviated from those models. Those texts include Marie de France's Espurgatoire seint Patriz, William Langland's Piers Plowman, Geoffrey Chaucer's The Pardoner's Tale, and Thomas Malory's Le Morte D'arthur. This dissertation reveals that several texts subscribed to an expectation of cosmic and personal annihilation, in the Augustinian representation, or of global transformation in the Joachist version. Nearly all of the texts agree in their bleak outlook regarding the end of time, suggesting a climate of fear predominated in the Middle Ages. While the projected Christian eschatological timeline should have fostered hope for the saved, what it produced was often terrors of eternity and emptiness.

abstract: This thesis presents a probabilistic evaluation of multiple laterally loaded drilled pier foundation design approaches using extensive data from a geotechnical investigation for a high voltage electric transmission line. A series of Monte Carlo simulations provide insight about the computed level of reliability considering site standard penetration test blow count value variability alone (i.e., assuming all other aspects of the design problem do not contribute error or bias). Evaluated methods include Eurocode 7 Geotechnical Design procedures, the Federal Highway Administration drilled shaft LRFD design method, the Electric Power Research Institute transmission foundation design procedure and a site specific variability based approach previously suggested by the author of this thesis and others. The analysis method is defined by three phases: a) Evaluate the spatial variability of an existing subsurface database. b) Derive theoretical foundation designs from the database in accordance with the various design methods identified. c) Conduct Monti Carlo Simulations to compute the reliability of the theoretical foundation designs. Over several decades, reliability-based foundation design (RBD) methods have been developed and implemented to varying degrees for buildings, bridges, electric systems and other structures. In recent years, an effort has been made by researchers, professional societies and other standard-developing organizations to publish design guidelines, manuals and standards concerning RBD for foundations. Most of these approaches rely on statistical methods for quantifying load and resistance probability distribution functions with defined reliability levels. However, each varies with regard to the influence of site-specific variability on resistance. An examination of the influence of site-specific variability is required to provide direction for incorporating the concept into practical RBD design methods. Recent surveys of transmission line engineers by the Electric Power Research Institute (EPRI) demonstrate RBD methods for the design of transmission line foundations have not been widely adopted. In the absence of a unifying design document with established reliability goals, transmission line foundations have historically performed very well, with relatively few failures. However, such a track record with no set reliability goals suggests, at least in some cases, a financial premium has likely been paid. / Dissertation/Thesis / M.S. Civil and Environmental Engineering 2014

This dissertation examines three literary treatments of patience in late medieval English literature. I argue that patience appears in the literature of late medieval England in a new and surprising form. Langland’s Patience in the B-text of Piers Plowman is an impoverished minstrel that disrupts and antagonizes his interlocutors through gnomic riddles and comic vignettes. The homiletic poem Patience, through a narrator hyperactively keen to transform suffering into “play” or “jape,” unpicks the deficiencies of a theology that views patience as “ease” or even pleasure and illuminates the Book of Jonah as a unique scriptural witness to the difficulty and estrangement of living within the patientia Dei. The “morality play” Mankind stages its grappling with the difficulties of Jobean patience through the antics of foul-mouthed diabolical and hamartiological agents who perpetually trouble the patience of both the characters and the audience. By reading these poems and plays very closely amidst their scriptural and patristic intertexts I argue that the works studied in this dissertation constitute an intense literary interest in the theology of patience in late medieval England, both as a spiritual and as a hermeneutic ideal. In Piers Plowman, Patience and Mankind, patience becomes a discomforting concatenation of mirth and despair. In Piers Plowman, Haukyn is brought to the belief that living “[s]o hard it is” by Patience’s comic vignettes. God’s “meschef” in Patience brings Jonah to cry, twice, that his life is “to longe.” Mankind loses his patience and sinks into acedia in Mankind via a theatrical “jape” by the professional minstrel Titivillus, a “jape” that the audience are repeatedly invited to be patient for. I argue that this unusual collocation of frivolity and sorrow can be understood partly in relation to the patristic focus on differentiating Christian patience from stoic fortitude and apatheia. This created a foundational concept of patience as participatory with the patientia Dei. The patience of God, as conceived in patristic treatises on patience, was a non-suffering (impassible) patience. The problem of conceptualizing the impassible patience of God produced, I argue, enduring formulations of God’s patience as a form of pleasure and, accordingly, of human patience as participatory with the pleasure of God. Yet, the pleasures that Piers Plowman, Patience and Mankind associate with their treatments of patience are not rarefied spiritual joys. Rather, in each text studied here, patience is particularly associated with the low-brow entertainments of minstrelsy, “jape” and “game.” This produces a disorienting concatenation of low-comedy and grave suffering through which, I argue, these writers align their explorations of the theology of patience with their own literary practice. In Piers Plowman, through Patience’s strange minstrelsy, Langland is making an important statement of his own learned “meddling with makings.” In Patience, the poem speaks in multiple voices to produce a contradictory and dissonant account of God’s patience and how it might be understood. In Mankind, the play’s central episode of the breaking of Mankind’s patience turns to the social and economic realities of the theatrical production itself to explain a theology of patience that will attend to a Creation of invisible and visible parts. Patience, often a wan-faced and inscrutable virtue, has a vibrant and unique life in the vernacular literature of late medieval England. The three texts studied here are a case study in the under-explored novelty of late medieval conceptions of patience that, I hope, might illuminate unexpected areas of late medieval devotional and literary practice.

To investigate the liquefaction mitigation capability of Rammed Aggregate Piers® (RAP) in silty sand, blast liquefaction testing was performed at a soil profile treated with a full-scale RAP group relative to an untreated soil profile. The RAP group consisted of 16 piers in a 4x4 arrangement at 2 m center-to-center spacing extending to a depth of 9.5 m. Blasting around the untreated area induced liquefaction (ru ≈1.0) from 3 m to 11 m depth, producing several large sand boils, and causing settlement of 10 cm. In contrast, installation of the RAP group reduced excess pore water pressure (ru ≈0.75), eliminated sand ejecta, and reduced average settlement to between 2 to 5 cm when subjected to the same blast charges. Although the liquefaction-induced settlement in the untreated area could be accurately estimated using the CPT-based settlement approach proposed by Zhang et al. (2002), settlement in the RAP treated area was significantly overestimated with the same approach even after considering RAP treatment-induced densification. Analyses indicate that settlement after RAP treatment could be successfully estimated from elastic compression of the sand and RAP acting as a composite material. The composite reinforced soil mass, surrounded by liquefied soil, transferred load to the base of the RAP group inducing settlement in the non-liquefied sand below the group. This test program identifies a mechanism that explains how settlement was reduced for the RAP group despite the elevated ru values in the silty sands that are often difficult to improve with vibratory methods.

No description available.

Silicones are widely used polymeric materials due to their unique properties. The material properties of silicones may be altered by incorporating various organic groups. Traditional methods for linear silicone synthesis involve ring-opening polymerization, which leaves the growing chain susceptible to acid or base mediated chain redistribution and the formation of cyclic monomer byproducts. The Piers-Rubinsztajn (PR) reaction is an alternative siloxane synthetic route that avoids the use of tin- or platinum- based, or of Brønsted acid/base catalysts. Siloxane bond formation is catalyzed by tris(pentafluorophenyl)borane (B(C6F5)3) (R’3Si-H + RO-SiR”3 → R’3Si-O-SiR”3 + RH); alkoxysilanes can be replaced with silanols or alkoxybenzenes. The catalytic activity of B(C6F5)3 was shown to be hindered by trace water in solution; water acts as a Lewis base coordinating to B(C6F5)3. Since the hydrate-free form of B(C6F5)3 is required to initiate a PR reaction, water can act as an inhibitor. In a somewhat contradictory fashion, water was also shown to react with hydrosilanes via a B(C6F5)3 catalyzed hydrolysis reaction to give silanols, that themselves are reagents for the process. The reactivity of alkoxysilanes (or aryl ethers) in the PR reaction was found to be much quicker than water. This was exploited in the synthesis of Ax(AB)yAx triblock copolymers. The aryl rich AB core was first synthesized using the PR reaction. Excess silicone condensed via hydrolysis forming the A blocks. This method of exploiting relative reactivity to tune structure was applied to elastomers made using a single linker (eugenol) with multiple functional groups – elastomer morphology was controlled by changing order of addition. The development of aryl dense silicones is of interest for use in electronic devices. Phenylmethyl homopolymers and highly ordered phenyl pendant copolymers (Ph/Si ratio of 0.5-1.5) were synthesized from monomers to give polymers with high refractive indices (1.51-1.59) and Mw up to 170 kDa. Statistically relevant libraries of aryl functional silicones were developed using combinatorial chemistry in order to analyze their structure-property relationship. Incorporating aromatic groups into silicones worked to elevate thermal stability, refractive index and improve the mechanical strength of silicone rubbers. / Thesis / Doctor of Science (PhD) / Silicone fluids and elastomers possess numerous desirable characteristics which leads to their use in a wide range of applications in the automotive, electronics and biomedical fields, among others. Developing techniques to create well defined, ordered, modified silicones with improved optical properties, mechanical strength and thermal stability was the main focus of this thesis. These objectives were accomplished by incorporating aromatic groups into silicones using boron catalysis. Following the initial (intended) Piers-Rubinsztajn reaction, atmospheric moisture was utilized to promote further polymerization. Statistically relevant libraries of silicone elastomers were prepared using both standard and combinatorial chemistry techniques. This library of elastomers permitted the analysis of trends associated with small changes in elastomer formulation, which could not be accomplished using traditional one-by-one reaction methods in a timely fashion. The modified silicone materials exhibited high refractive indices (up to 1.59), elevated stiffness and improved thermal stability (maintain structure up to 500 °C) when compared to previously synthesized polymers.

Silicones elastomers are widely used all over the world due to their unusual properties when compared to their carbon-based counterparts. Synthetic methods for their synthesis are still quite limited and the traditional silicone products are not able to completely meet the requirement for modern materials. Silicone elastomers with customized structures and with higher levels of sustainability will be the research focus for the development of next generation materials. The element sulfur and its functional groups are growing players in modern polymer and materials science, since sulfur reactions are exceptionally versatile. The incorporation of sulfur reactions into the design and preparation of silicone materials can lead to silicones with unique properties for various research interests. Initial exploration was focused on the creation of general and simple methods for 3D printing silicone elastomers using thiol-ene chemistry. However, silicone inks suitable for 3D printing are still quite limited. Photo-initiated thiol-ene chemistry was proposed to design a rapid cure silicone ink for extrusion 3D printing. Unlike other radical reactions, the relatively oxygen insensitive thiol-ene was able to provide the necessary rapid reaction rate and build up the necessary viscosity for practical printing in less than 2 seconds in the presence of air. Various customized silicone structures with different moduli were obtained with a relative fast printing speed. The use of thiol oxidation reactions in the synthesis of silicone elastomers is also demonstrated in this thesis. Reductive cleavage of the resulting disulfide bridge was successfully performed with the presence of hydrosilane and B(C6F5)3 catalyst. Herein, a synthetic method to reversible silicone elastomers based on the disulfide linkage is described. This method could be extended to cleave the disulfide and polysulfide linkage in used automotive rubber materials. Various kinds of sulfur-cured rubbers were successfully devulcanized to polymeric oil. This simple and efficient method could potentially offer a solution for the huge amount of tire waste produced every year. Finally, a new method for preparing thermoplastic silicone elastomers with ionic linkages is reported. A novel dicarboxylic acid-modified silicone was synthesized though thiol-Michael additions. The resulting ionic crosslinked networks were built though the neutralization between carboxylic and amino silicone. Thermoplastic silicone elastomers with unique viscoelastic behavior can be obtained. In summary, the thesis demonstrates that sulfur chemistry is an exceptional synthetic tool for the silicone chemist. / Thesis / Doctor of Philosophy (PhD)

Load Factor Design (LFD), adopted by AASHTO in the mid-1970, is currently used for bridge superstructure design. However, the AASHTO specifications do not have any LFD provisions for foundations. In this study, a LFD format for the design of shallow foundations for bridges is developed. Design equations for reliability analysis are formulated. Uncertainties in design parameters for ultimate and serviceability limit states are evaluated. A random field model is employed to investigate the combined inherent spatial variability and systematic error for serviceability limit state. Advanced first order second moment method is then used to compute reliability indices inherent in the current AASHTO specifications. Reliability indices for ultimate and serviceability limit states with different safety factors and dead to live load ratios are investigated. Reliability indices for ultimate limit state are found to be in the range of 2.3 to 3.4, for safety factors between 2 and 3. This is shown to be in good agreement with Meyerhof's conclusion (1970). Reliability indices for serviceability limit state are found to be in the range of 0.43 to 1.40, for ratios of allowable to actual settlement between 1.0 to 2.0. This appears to be in good agreement with what may be expected. Performance factors are then determined using target reliability indices selected on the basis of existing risk levels. / Master of Science

Real-time structural health monitoring is a well established tool for post-earthquake damage estimation. A key component in the monitoring campaign is the approach used for processing the data from the structural health monitoring system. There is a large body of literature on signal processing approaches aimed at identifying ground-motion induced damage in civil engineering structures. This dissertation expands on a specific subgroup of processing approaches dealing with the identification of damage induced high-frequency transients in the monitoring data. The underlying intuition guiding the current research can be formulated in the following hypothesis - the time difference between the occurrence of a high-frequency transient and the closest deformation extremum forward in time is proportional to the degree of damage. A mathematical deduction is provided in support of the above hypothesis followed by a set of shaking table tests. For the purposes of this research two shaking table tests of reinforced concrete bridge piers were performed. Data from a shaking table test performed by another research group was also analyzed. The cases in which the proposed procedure could find a practical application are examined along with the present limitations.

In the last ten years the Church of England has tried, by means of two reports leading to what I term the ‘Hind settlement’, to re-configure its provision of theological education. The tensions generated by the attempt to hold together different discourses and to impose regional re-organisation in the context of complex developments both in higher education and in patterns of lay and ordained ministry form the basis of my critique of Hind. I argue that Hind’s recourse to the image of the ‘body of Christ’ in the service of an instrumentalist model of ministry exposes inadequacies of a theological anthropological, Christological and ecclesiological nature. I identify a medieval text, Piers Plowman, as a conversation partner which offers a different way of negotiating an analogously difficult set of issues around learning, discipleship and power. My hermeneutical approach to the poem sees its primary impetus as arising from the constant interplay between the experiences of daily life and the attempt to work out a personal and social understanding of salvation. By comparing the ways in which Hind and Langland explore learning as measurable progress, and lay and clerical models of learning, I propose that Piers Plowman offers some valuable resources to the next stage of the Hind process. Not only does the poem foreground the chaotic co-existence of multiple voices in a marketplace of competing definitions of learning, and acknowledge the recalcitrance of communities when presented with opportunities to change, but it also, in the figure of Piers, hints at the possibility of going beyond the lay/clerical impasse. The poem’s recognition of sin and the need for repentance, in contrast to Hind language of management and effectiveness, and its requirement of the reader to participate in the making of new meaning, present an ongoing challenge to a culture of ‘learning outcomes’.