Thesis (M.Eng.Sc.)--University of Adelaide, Dept. of Civil and Environmental Engineering, 2000? / Corrigenda pasted onto front end-paper. The CD contains Excel spreadsheets containing data collected. Bibliography: leaves 209-222.

Thesis (Ph. D.)--University of California, Santa Cruz 2003. / Typescript. Includes bibliographical references (leaves 302-315).

No description available.

Table Mesa and Rattlesnake Fields are located on the Four Corners Platform, New Mexico, between the Paradox Basin to the north and San Juan Basin to the south. Diagenesis is extensive and includes partial dissolution and replacement of ooids, partial silicification of allochems and matrix, and filling of pore space with large, blocky calcite. Pore types include interparticle, intraparticle, and vuggy, with much porosity lost to late cementation. Porosity is greatest in cycles interpreted as regressive deposits with meteoric and burial diagenesis being most significant to porosity enhancement. Sea level and depositional history are shown to be significantly useful in predicting patterns of porosity development and destruction. These results are directly applicable to other economically important carbonate platforms.

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Ce travail a pour fin de mieux faire connaître l’oeuvre de la polygraphe jacobite Jane Barker en France, en offrant une première traduction littéraire ainsi qu’un commentaire d’un cycle de trois récits romanesques : The Amours of Bosvil and Galesia — également connu sous le titre de Love Intrigues —, A Patch-Work Screen for the Ladies et The Lining of the Patch-Work Screen. Afin de rendre plussensible la spécificité de ces textes, la traduction s’efforce de retrouver une langueaussi proche que possible du français des contemporains de Jane Barker. Après unaperçu de la vie de Jane Barker (1652-1732), puis de sa fortune critique au XXesiècle, le commentaire prolonge le travail de contextualisation historique et idéologique ébauché dans l’appareil de notes parallèle (travail également pré-requispar la traduction) en étudiant successivement chacune des trois œuvres du corpus. A l’aide des hypotextes manuscrits de la trilogie, largement construite sur une oeuvre poétique antérieure vouée à une diffusion manuscrite, il s’attache à esquisser, dans la lignée des études critiques influencées par le nouvel historicisme, les résonances intellectuelles et les implications idéologiques, ainsi que les audaces esthétiques d’une oeuvre longtemps considérée comme alimentaire et comme dominée par la recherche d’une respectabilité propre à l’écrivain femme. Abandonnant l’image posthume de Jane Barker comme fille autoproclamée de la chaste Orinda, il souligne la pluralité du discours Barkerien – méditation, plaidoyer pro-Stuart et injonction, mais aussi interaction de codes romanesques en constitution et d’une idéologie subversive. / This work is intended to make a French audience better acquainted with the work of the little-known Jacobite writer Jane Barker through a translation and study of her threefold novelistic attempt, viz The Amours of Bosvil and Galesia, also known as Love Intrigues, A Patch-Work Screen for the Ladies and The Lining of the Patch-Work Screen. The translation aims at preserving the specificity of the textsthrough a language reminiscent of XVIIIth century French. The contextualizationinitiated in the notes on the text, which is a prerequisite for the translation, is carried further in a commentary which offers first an overview of Jane Barker’s life (1652- 1732) and posthumous existence in XXth century criticism, then an analysis of each of her narratives. Paying due attention to the manuscript base of the cycle, the sources and keys of which can be traced back to Jane Barker’s former, and still privately circulated, work as a manuscript poetess, this study outlines the intellectual involvement and ideological significance, as well as formal ingenuity, of a series of texts which have for too long been considered as mere journeyman’s work by a onetime amateur, merely seeking to establish her respectability as a professional woman writer. Questioning Jane Barker’s image as a self-proclaimed daughter of the chaste Orinda, the study focuses on the evolution of multi-layered discourse, which weaves together personal meditations, pro-Stuart pleas and a partisan agenda in a fruitful interaction between emerging narrative codes and a subversive ideology.

Este trabalho descreve o desenvolvimento de um algoritmo para avaliar o grau de corrosão em paredes de oleodutos, através de ultrassom. O algoritmo desenvolvido será implementado em um circuito digital, fazendo parte de um sistema que poderá ser embarcado em pigs ultrassônicos para inspeção de dutos à procura de corrosão. O modelo matemático conhecido como filtro casado é usado como base do algoritmo, além de um método de detecção de picos para localização dos sinais de eco de ultrassom, provenientes das reflexões do sinal nas paredes dos dutos. Um dos problemas é a definição do sinal (e do filtro) que será utilizado, mas por meio de sinais sintetizados (signal design) uma grande gama de alternativas foi analisada e apenas algumas foram selecionadas para testes em experimentos. Por último os melhores sinais foram utilizados na inspeção de um corpo de prova feito à partir de um duto corroído, e os resultados são analisados. A detecção da primeira parede do oleoduto apresenta resultados promissores em comparação com a medição tridimensional das mesmas paredes. O sistema foi capaz de reconstruir o perfil da parede interna do duto com elevada verossimilhança, mesmo em regiões severamente corroídas. A detecção da segunda parede apresenta resultados satisfatórios para baixos níveis de corrosão, porém alguns problemas foram encontrados para níveis mais altos de corrosão, prejudicando a medição direta da espessura da parede nestas condições. / This work describes the development of an algorithm to evaluate the degree of corrosion in pipeline walls, using ultrasound. The developed algorithm will be implemented in a dedicated digital circuit that can be embedded in ultrasonic pigs for pipeline corrosion inspection. The algorithm is based on the mathematic model known as matched filter, besides a peak detection method for the location of ultrasound echoes, originated from the signal reflections in the pipeline walls. One problem is the determination of the signal (and filter) that should be used, but using a signal design approach a large number of possibilities could be analyzed and only a few was tested in experiments. Finally, the best signals were used to inspect a test specimen made of a corroded pipeline section, and the results were analyzed. The first wall detection shows promising results when compared to the results of a three-dimensional inspection of the same walls. It was possible to reconstruct the profile of the internal wall with good likelihood, even at badly corroded areas. The second wall detection shows some satisfactory results on low corrosion levels, but show some problems with high corrosion levels, compromising the direct measurement of the wall of the pipeline.

Este trabalho descreve o desenvolvimento de um algoritmo para avaliar o grau de corrosão em paredes de oleodutos, através de ultrassom. O algoritmo desenvolvido será implementado em um circuito digital, fazendo parte de um sistema que poderá ser embarcado em pigs ultrassônicos para inspeção de dutos à procura de corrosão. O modelo matemático conhecido como filtro casado é usado como base do algoritmo, além de um método de detecção de picos para localização dos sinais de eco de ultrassom, provenientes das reflexões do sinal nas paredes dos dutos. Um dos problemas é a definição do sinal (e do filtro) que será utilizado, mas por meio de sinais sintetizados (signal design) uma grande gama de alternativas foi analisada e apenas algumas foram selecionadas para testes em experimentos. Por último os melhores sinais foram utilizados na inspeção de um corpo de prova feito à partir de um duto corroído, e os resultados são analisados. A detecção da primeira parede do oleoduto apresenta resultados promissores em comparação com a medição tridimensional das mesmas paredes. O sistema foi capaz de reconstruir o perfil da parede interna do duto com elevada verossimilhança, mesmo em regiões severamente corroídas. A detecção da segunda parede apresenta resultados satisfatórios para baixos níveis de corrosão, porém alguns problemas foram encontrados para níveis mais altos de corrosão, prejudicando a medição direta da espessura da parede nestas condições. / This work describes the development of an algorithm to evaluate the degree of corrosion in pipeline walls, using ultrasound. The developed algorithm will be implemented in a dedicated digital circuit that can be embedded in ultrasonic pigs for pipeline corrosion inspection. The algorithm is based on the mathematic model known as matched filter, besides a peak detection method for the location of ultrasound echoes, originated from the signal reflections in the pipeline walls. One problem is the determination of the signal (and filter) that should be used, but using a signal design approach a large number of possibilities could be analyzed and only a few was tested in experiments. Finally, the best signals were used to inspect a test specimen made of a corroded pipeline section, and the results were analyzed. The first wall detection shows promising results when compared to the results of a three-dimensional inspection of the same walls. It was possible to reconstruct the profile of the internal wall with good likelihood, even at badly corroded areas. The second wall detection shows some satisfactory results on low corrosion levels, but show some problems with high corrosion levels, compromising the direct measurement of the wall of the pipeline.

Studying the preload in a screw joint has been the focus of today’s industry. The manufacturer reflects that demand by investigating different opportunities and techniques to develop this area. There are four different ways of controlling the tightening of bolts and joints to achieve the required clamp force that can hold for a specific preload. Torque control, angle control, gradient control, and ultrasonic clamp-force or elongation control. Many studies do exist about the first three mentioned techniques. However, there are a small number of studies for the ultrasonic clamp-force technique, and there is no study focusing on the usage of machine learning in that technique. This study investigates the use of machine learning to find the optimal frequency used to transmit the ultrasonic signals into the bolt for calculating the bolt elongation. Two machine learning models have been constructed, presenting two approaches: one for one-dimensional data (1D-CNN) and one for two-dimensional data (2D-CNN). The models classify the received signals (echos) with different frequencies into either accepted or non-accepted signals to get the optimal frequencies to be used later on, in the bolt elongation process. Both the 1D-CNN and 2D-CNN show an accepted performance of around 85% accuracy. The results indicate that there does exist a pattern in these ultrasonic signals that are useful for classifying them into accepted and non-accepted frequencies, so the usage of machine learning for the problem is feasible. / Att studera förspänningen i en skruvförband har varit i fokus för dagens industri. Tillverkaren speglar den efterfrågan genom att undersöka olika möjligheter och tekniker för att utveckla detta område. Det finns fyra olika sätt att kontroller åtdragningen av bultar för att uppnå den erforderliga klämkraften som kan hålla för en specifik förspänning. Vridmomentkontroll, vinkelkontroll, gradientkontroll och ultraljudskontroll av klämkraft. Det finns många studier om de tre förstnämnda teknologier. Det finns dock ett litet antal studier för ultraljudsklämkraftstekniken, och det finns ingen studie som fokuserar på användningen av maskininlärning i den tekniken. Denna studie undersöker användningen av maskininlärning för att hitta den optimala frekvensen som används för att beräkna bultens förlängning. Två maskininlärningsmodeller har konstruerats, som presenterar två metoder: en för endimensionell data (1D-CNN) och en för två-dimensionella data (2D-CNN). Modellerna klassificerar de mottagna signalerna (ekon) med olika frekvenser i antingen accepterade eller icke-accepterade signaler för att få de optimala frekvenserna att användas senare, i bultförlängningsprocessen. Både 1D-CNN och 2D-CNN visar en accepterad prestanda på cirka 85% noggrannhet. Resultaten indikerar att det finns ett mönster i dessa ultraljudssignaler som är användbara för att klassificera dem i accepterade och icke-accepterade frekvenser, så användningen av maskininlärning för problemet är genomförbar.

No description available.