Thesis (M.S.)--Montana State University--Bozeman, 2007. / Typescript. Chairperson, Graduate Committee: Billie Kerans. Includes bibliographical references (leaves 109-120).

This thesis details the investigation into the Whirling Planar Pendulum system. The WPP is a pendulum that is spun around a vertical spin axis at a controllable horizontal offset. This dynamical system exhibits both local and global bifurcations. The local pitchfork bifurcation leads to the splitting of a single stable equilibrium point into three (two stable and one unstable), as the spin rate is increased. The global bifurcations lead to two independent types of chaotic oscillations which are induced by sinusoidal excitations. The types of chaos are each associated with one of two homoclinic orbits in the system's phase portraits. The onset of each type of chaos is investigated through Melnikov's Method applied to the system's Hamiltonian, to find parameters at which the stable and unstable manifolds intersect transversely, indicating the onset of chaotic motion. These results are compared to simulation results, which suggest chaotic motion through the appearance of strange attractors in the Poincaré maps. Additionally, evidence of the WPP system experiencing both types of chaos simultaneously was found, resulting in a merger of two distinct types of strange attractor. / Master of Science / This report details the investigation into the Whirling Planar Pendulum system. The WPP is a pendulum that is spun around a vertical spin axis at a controllable horizontal offset. This system can be used to investigate what are known as local and global bifurcations. A local bifurcation occurs when the single equilibrium state (corresponding to the pendulum hanging straight down) when spun at low speeds, bifurcates into three equilibria when the spin rate is increased beyond a certain value. The global bifurcations occur when the system experiences sinusoidal forcing near certain equilibrium conditions. The resulting chaotic oscillations are investigated using Melnikov’s method, which determines when the sinusoidal forcing results in chaotic motion. This chaotic motion comes in two types, which cause the system to behave in different ways. Melnikov’s method, and results from a simulation were used to determine the parameter values in which the pendulum experiences each type of chaos. It was seen that at certain parameter values, the WPP experiences both types of chaos, supporting the observation that these types of chaos are not necessarily independent of each other, but can merge and interact.

Myxobolus cerebralis, a myxozoan parasite of salmonids, is the causative agent of whirling disease. The parasite is considered widespread throughout northeastern Oregon in the Grande Ronde and Imnaha River basins where threatened and endangered salmonid populations exist. The work presented in this thesis comprises several studies that assess the effects of M. cerebralis on resident and anadromous salmonids in Oregon. Laboratory challenges to determine the susceptibility of indigenous Deschutes River, Oregon, salmonids to M. cerebralis were conducted as part of a study to assess the risk of reintroducing anadromous salmon above a migration barrier on that river. This study was the first to assess the susceptibility of kokanee salmon Oncorhynchus nerka to M. cerebralis, and results contribute to the understanding of salmonid susceptibility as it relates to species and age. Further, this study demonstrates that the indigenous salmonids present in the river are susceptible to infection, but resident rainbow trout Oncorhynchus mykiss would be most at risk should introduction of M. cerebralis occur in this system. The susceptibility of chinook salmon Oncorhynchus tshawytscha to M. cerebralis was assessed following laboratory challenges at different ages to different parasite levels. Results from this study indicate that chinook salmon are more resistant to M. cerebralis infection than susceptible rainbow trout; resistance to disease developed in chinook salmon exposed after 3 weeks of age. Sustained exposures to a low parasite dose were performed to model the conditions chinook salmon would encounter in a natural exposure. Following continuous exposure to low parasite densities, chinook salmon were very resistant to infection and disease. Managed populations of chinook salmon and steelhead Oncorhynchus mykiss juveniles are held in acclimation facilities on their natal streams before release to commence their seaward migration. Rainbow trout fry were held at each of the acclimation facilities to detect the presence of M. cerebralis and to assess the prevalence of exposure during the acclimation period. Results from these exposures indicate that the Wallowa acclimation facility is a high-risk site for parasite exposure of steelhead juveniles. Further, detection was confirmed in several rivers and streams where the presence of M. cerebralis has been suggested. Finally, a preliminary study on the effect of M. cerebralis on survival of steelhead juveniles upon transfer to saltwater was conducted. Results from this study indicate that M. cerebralis exposure and infection may increase mortality among juvenile steelhead during saltwater adaptation. / Graduation date: 2003

Les vibrations des systèmes de forage pétrolier sont à l'origine de nombreux dysfonctionnements (ruptures des tiges par une fatigue accélérée, réduction des performances, endommagement des outils de mesures, endommagement des parois du puits, etc.). Face à la complexité des puits forés aujourd'hui, la maîtrise des vibrations des systèmes de forage est plus que jamais un enjeu majeur dans la réussite économique d'un projet pétrolier. Durant l'opération de forage, les tiges en rotation entrent en interaction avec les parois du puits (tubage et/ou formation) et encaissent dans certains cas des vibrations sévères. On distingue généralement trois modes de vibrations suivant le plan de leur occurrence : axiales, latérales et de torsion. Nous ne nous intéressons dans ce mémoire qu'aux vibrations latérales des tiges de forage. Si les vibrations latérales ont fait l'objet de nombreuses études dans le passé, il reste néanmoins des axes d'amélioration possible, tant sur la compréhension des phénomènes (contact garniture-puits par exemple) que sur la recherche de méthodes numériques permettant de réduire les temps de calcul. Dans le cadre de cette thèse, un modèle a été développé pour étudier les vibrations latérales des garnitures de forage dans des forages à trajectoires complexes. Ce modèle permet de prédire les vibrations latérales des tiges pour des paramètres opératoires donnés (vitesse de rotation, poids sur l'outil de forage). Un modèle numérique en éléments finis a été développé pour résoudre les équations du mouvement et analyser ainsi la sensibilité des vibrations aux paramètres opératoires du forage en particulier la vitesse de rotation et l'effort axial dans les tiges. Le modèle permet en outre d'analyser la réponse dynamique d'une garniture en cours du forage (conception). En outre, cette étude a permis de mieux élucider le phénomène sévère de précession des tiges (whirling), très nuisible à l'intégrité mécanique des systèmes de forage. Un nouveau banc d'essais a été mis au point par le Centre de Géosciences de Mines ParisTech pour reproduire les vibrations latérales, mieux comprendre le phénomène du whirling et valider les résultats numériques du modèle. Par ailleurs, des mesures dynamiques en surfaces et en fond de puits au cours de forages réels ont été analysées afin de mettre en évidence les vibrations latérales les plus sévères et en particulier le whirling. Ces données de terrain ont permis de comparer les fréquences propres du système mesurées et celles fournies par le modèle numérique. / Drillstring vibrations are commonly observed during oil & gas well drilling operations. Vibrations are a major cause of drilling tools dysfunction (drillstring breaking because of fatigue, reduced drilling efficiency, measurement-while-drilling tools failure, damaging of drill bits, etc.). Because of the increasing complexity of oil & gas wells drilled nowadays, operators need to mitigate efficiently the drillstring vibrations in order to successfully achieve the drilling process. During the drilling operation, rotating drillstrings are in interaction with the well borehole (casing and/or rock) which may lead to severe vibrations. Different vibrations modes occur simultaneously while drilling, we identify mainly three modes: axial, torsional and lateral. This work deals only with lateral vibrations. Literature survey papers show numerous experimental and numerical studies carried out on drillstring dynamics. The developed models don't take into account sufficiently the complex drillstring-borehole interactions or the efficient numerical methods needed to reduce the computation time. A new drillstring dynamics model has been developed within this thesis in order to compute the lateral vibrations of drillstrings in a complex well trajectory. Given the operating parameters (rotary speed, weight on bit) the model predicts the dynamics response of the drillstring in terms of lateral vibrations. A finite element model has been implemented to solve for the equations of motion of the dynamics model and study the dependence of the lateral vibrations on some operating parameters of the system, mainly the rotary speed and the axial load on the drillstrings. The finite element model can be used to compute and enhance the dynamic response of a given drillstring configuration for design issues. Besides, the model can be used to understand some dynamic phenomena encountered while drilling (post-analysis). Moreover, this study was useful to better understand the “whirling” phenomenon which is very harmful for the drilling system components. A new lateral vibrations simulator was built at Mines ParisTech in order to understand the whirling phenomenon and validate the numerical results provided by the dynamics model. Surface and downhole fieldmeasurements have been analyzed in order to understand the occurrence of whirling. The eigenfrequencies evaluated from the field data have been found very close to those provided by the dynamics model.

The aim of this thesis is to analyze the kinematic and dynamic characteristics of a high-speed bearing system. The examined kinematic characteristics will include the maximal speed, fatigue life and stiffness of a bearing system. The stability and transmission force of a bearing system as well as the vibration of its shaft were the studied dynamic characteristics. These analyses were based on the kinemitics of bearing systems, rotor dynamics and elastohydrodynamic lubrication theory. According to these analyses, the interaction and consequence among these characteristics and the parameters of a bearing system will be explained. After these analyses, preliminary and simple design trends about a high-speed bearing system are going to be proposed.

Thesis (Ph. D.)--Montana State University--Bozeman, 2004. / Title from PDF t.p. (viewed on June 12, 2006). Chairperson, Graduate Committee: Thomas McMahon. Includes bibliographical references.

Recent political developments in the world show us that different cultures need to know and understand each other better. Even though technological developments like the Internet, satellites, cable television and conglomeration of big media entities have made mass communication more effective and faster, we cannot easily say that these developments help to bring world cultures together. As a result, mass audiences are not very much able to see what few productions do speak to these issues in a constructive manner. The main aim of this documentary film project is to serve as a small step towards helping different cultures to understand each other better. This documentary film conveys the basics of Mevlevism by following the formal gatherings of a Mevlevi den in Istanbul, Turkey. A den or tekke is a place where Islamic people gather and perform their religious activities. During these gatherings they do the sema, they pray, they listen to music, and they discuss spiritual matters. Sema is the entire ritual they perform as part of their ceremonies including listening to music, singing and chanting to attain a state of religious emotion and ecstasy or vecd. The documentary film is structured around a twelve year old girl, Elif, who is learning the basics of Mevlevism. The interviews conducted with regulars from the den explain to the audience why people are attracted to this belief system. Filming the ceremonies at the 550-year-old Mevlevi temple in Galata, Istanbul accentuates the historic background of this belief system. The Night of Reunion is the day in which Mevlevis celebrate the passing of Mevlana Celaleddin Rumi, the founder of Mevlevism and provides the climax of the film. Elif performs on that night, a very important moment in her spiritual life.

This practice-as-research project (a) invents, examines and self-reflects upon two techniques - 'Whirling in Pain' and 'Neurobreathing' - that the author has developed for dealing with pain in performance, (b) creates a framework for the qualitative analysis of pain retraining techniques by conducting an interdisciplinary study of the parameters that describe Somatic Practices and the psychology of Altered States of Consciousness, (c) establishes a taxonomy and classifications for describing and assessing techniques of pain management in the performing arts, (d) qualitatively assesses the training techniques of three practitioners —Antonin Artaud, Jerzy Grotowski and Marina Abramović—who have used Somatic Practices and Altered States of Consciousness in their techniques, and draws out patterns and themes in their practice, (e) distils generic principles of practice that are essential for training pain perception and could be used by other practitioners for developing their own techniques, or to better embody the techniques that the author has developed. These transferable principles are: reinforcement, exhaustion of pain-processing resources, inquisitive modes towards otherness, embodied knowledge, surrendering, Sisyphean reiteration, and music’s capacity for fascination. This dissertation considers the issue of dealing with pain in performance beyond the limited area of theatre pedagogy, suggesting an interdisciplinary approach and expanding its scope into the wider realms of theoretical discourse around culture and pain. This dissertation argues that since pain is not only a biochemical process but one that is culturally constructed, it is therefore possible to retrain or un-train the perception of pain through the facility of Somatic Practices that induce Altered States of Consciousness. Such retraining of pain perception has wider socio-political ramifications that challenge the pervading modern and neoliberal culture around pain, which understands it only through a reductively biological model and relies heavily on the use of exogenous analgesics to alleviate pain. Finally, this dissertation proposes that dealing with pain is possible not only by transcending and moving attentional focus away from pain, but also by entering a plane of immanence, achieved through working synergistically with pain in order to find the coping mechanisms and hidden reserves that lie dormant within the individual. The practical element of this submission consists of: (a) a Manual for Practitioners that describes the techniques step-by-step, and explains the principles behind them, and, (b) two performance videos that exhibit how the author has used the two techniques to create and manage pain within performances.

The goal of the thesis is wear analysis of cutting inserts used for machining 42CrMo4 steel. Theoretical part of the thesis contains comparison of turning and milling machining processes, machining methods for ball screws made of 42CrMo4 and description of experimental methods of tool wear analysis. Experimental part of thesis contains methodology of cutting inserts wear measurement for chosen machining method. The following testing is focused on cutting insert wear as well as workpiece surface analysis. Thesis is finished with processing of measured data and overall evaluation of achieved results.

In addition to a loss of potential revenues from Utah's $393 million sport fishing industry, the state expends millions of dollars every year on costs associated with whirling disease mitigation and prevention. A state fish hatchery at Midway, Utah was closed when the shallow unconfined aquifer being used for fish culture by spring discharge was deemed to be contaminated by whirling disease. An alternative water source may exist in a confined aquifer below this contaminated unconfined aquifer. However, the complex hydrostratigraphy presents a challenge in determining if this source is a viable resource for fish culture. Geological, physical, chemical, geophysical, and isotopic data were combined to create a conceptual model of the groundwater flow at the site and to determine the interactions this confined aquifer may have with the contaminated aquifer. This model divides groundwater at the hatchery into a shallow unconfined system, an upper confined system, and a lower confined system. The shallow unconfined system is characterized by a water table ~1m below ground surface, several active springs, fast travel times, modern water mixed with ancient hydrothermal water, relatively high TDS, and relatively enriched isotopic values. The confined aquifers have a smaller hydrothermal component, relatively depleted isotopic values, lower TDS, and modern recharge components. Two orthogonal shallow high-resolution seismic reflection profiles indicate substantial heterogeneity in the subsurface at the level of the confined systems at the hatchery. Several north-south trending normal discontinuities were interpreted as possible faults from the seismic profile oriented as a dip line, whereas the strike profile shows discontinuous layering without noticeable faulting. A well log profile for the site shows discontinuous tufa layers amid heterogeneous alluvium material. These tufa layers separate upward leaking confined aquifers from the unconfined system. It is only through the integration of several methods that such mixed systems, can be understood. In this study, the lower confined aquifer was found to be a sufficient and safe resource through the integration of numerous methods.