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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Design of a high-efficiency, high-performance zero-voltage-switched battery charger-discharger for the NASA EOS space platform /

Espinosa, Pablo A., January 1994 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 121-123). Also available via the Internet.
2

Towards both-and land : a journey from answers to questions about the therapeutic self

Zagnoev, Joanne 01 1900 (has links)
This thesis constitutes a narrative description of the evolution of my therapeutic self during my training as a clinical psychologist. During the telling of this story, I review the ways in which I was perturbed by the mix between the various theories and the various contexts visited during the years of my post-graduate training. I have described and critically compared my responses to the following models: psychoanalytic, psychodynamic, first-order cybernetic, and secondorder cybernetic (covering the first, second and third movements). Throughout, I have attempted to track the development of a congruent, personal therapeutic self while simultaneously assuming that this self is constantly coming-into-being. / Psychology / M.A. (Clinical Psychology)
3

Cybernetics and Christianity : the pattern that connects

Gradwell, Vanessa May 06 1900 (has links)
Two important trends have been noted in humankind's thinking of the world. These are increasing dissatisfaction with the rigid, dichotomous views of the Cartesian-Newtonian paradigm, and an increasing awareness of humankind's gpirituality. This dissertation broaches both these trends by exploring the new paradigm, that of cybernetic epistemology, which is a far more holistic and spiritual perspective. This is done as follows. Certain concepts from cybernetics are discussed in terms of their implications and meanings. These are then discussed from a spiritual perspective, (specifically Christian), according to how they fit with the Biblical understanding of God and His creation. The aim was to see if and how cybernetics and Christianity meet - how their basic assumptions about the world and life compare. The conclusion is that the relationship between cybernetics and Christianity is that they are both similar and different and this dissertation is about the pattern that connects the two. / Psychology / M.A. (Clinical Psychology)
4

Towards both-and land : a journey from answers to questions about the therapeutic self

Zagnoev, Joanne 01 1900 (has links)
This thesis constitutes a narrative description of the evolution of my therapeutic self during my training as a clinical psychologist. During the telling of this story, I review the ways in which I was perturbed by the mix between the various theories and the various contexts visited during the years of my post-graduate training. I have described and critically compared my responses to the following models: psychoanalytic, psychodynamic, first-order cybernetic, and secondorder cybernetic (covering the first, second and third movements). Throughout, I have attempted to track the development of a congruent, personal therapeutic self while simultaneously assuming that this self is constantly coming-into-being. / Psychology / M.A. (Clinical Psychology)
5

Cybernetics and Christianity : the pattern that connects

Gradwell, Vanessa May 06 1900 (has links)
Two important trends have been noted in humankind's thinking of the world. These are increasing dissatisfaction with the rigid, dichotomous views of the Cartesian-Newtonian paradigm, and an increasing awareness of humankind's gpirituality. This dissertation broaches both these trends by exploring the new paradigm, that of cybernetic epistemology, which is a far more holistic and spiritual perspective. This is done as follows. Certain concepts from cybernetics are discussed in terms of their implications and meanings. These are then discussed from a spiritual perspective, (specifically Christian), according to how they fit with the Biblical understanding of God and His creation. The aim was to see if and how cybernetics and Christianity meet - how their basic assumptions about the world and life compare. The conclusion is that the relationship between cybernetics and Christianity is that they are both similar and different and this dissertation is about the pattern that connects the two. / Psychology / M.A. (Clinical Psychology)
6

Sports coaching as an ecology of ideas

Muller, Gene 01 1900 (has links)
In this study an ecosystematic approach to sports coaching is forwarded. This approach is illustrated using the analogy of an ecology of ideas. Ideas informing the life span of a coach within an elite team are explored. The researcher engaged four subjects in conversations the life span of a coach in an elite team. these conversations are viewed as co-constructions of realities. The coach abides within a team for a limited time. he or she enters an existing ecology of ideas, which can contribute to, or detract from, the efficacy of the coach in a team. This ecology of ideas evolves as aold meanings shift and new meanings emerge. These menings are explored in this disertation. An awareness of the ecology of ideas within a team can inform the coach to perturb the ecology of ideas in a direction that is mutually qualified as successful / Psychology / M.A. (Clinical psychology)
7

Sports coaching as an ecology of ideas

Muller, Gene 01 1900 (has links)
In this study an ecosystematic approach to sports coaching is forwarded. This approach is illustrated using the analogy of an ecology of ideas. Ideas informing the life span of a coach within an elite team are explored. The researcher engaged four subjects in conversations the life span of a coach in an elite team. these conversations are viewed as co-constructions of realities. The coach abides within a team for a limited time. he or she enters an existing ecology of ideas, which can contribute to, or detract from, the efficacy of the coach in a team. This ecology of ideas evolves as aold meanings shift and new meanings emerge. These menings are explored in this disertation. An awareness of the ecology of ideas within a team can inform the coach to perturb the ecology of ideas in a direction that is mutually qualified as successful / Psychology / M.A. (Clinical psychology)
8

Etude multi-échelle de la convection océanique profonde en mer Méditerranée : de l'observation à la modélisation climatique / Multi-sale study of ocean deep convection in the Mediterranean sea : from observations to climate modelling

Waldman, Robin 16 December 2016 (has links)
La Méditerranée Nord-Occidentale, ou bassin Liguro-Provençal, est l'un des rares sièges de la convection océanique profonde. Ce phénomène localisé et intermittent est l'un des principaux modes d'interaction de l'océan profond avec le système climatique. Il est d'une importance primordiale pour la redistribution verticale de chaleur, de dioxyde de carbone et d'éléments biogéochimiques par l'océan, et donc pour le climat et la biologie marine. Le travail de thèse s'inscrit dans le cadre du programme HyMeX, il vise à caractériser le phénomène de convection dans le bassin Liguro-Provençal à partir du cas d'étude de l'année 2012-2013 et à comprendre le rôle de la dynamique de méso-échelle et de la variabilité intrinsèque océanique qui en résulte sur la convection. Le travail de thèse a tout d'abord porté sur la caractérisation du phénomène de convection océanique profonde à partir des observations du cas d'étude 2012-2013. On a estimé le taux de convection hivernale et de restratification printanière et une Expérience de Simulation d'un Système d'Observations (OSSE) a été développée pour estimer l'erreur d'observation associée. On conclut à la validité des observations du réseau MOOSE pour estimer les taux de convection et de restratification sur la période 2012-2013. On caractérise la période comme exceptionnellement convective avec un taux de convection hivernal de 2.3±0.5Sv (1Sv=106m³/s) et on estime pour la première fois un taux de restratification printanière de 0.8±0.4Sv. Deux approches numériques novatrices ont été développées au cours de la thèse pour caractériser le rôle de la méso-échelle et de la variabilité intrinsèque océanique sur le phénomène de convection. On a implémenté l'outil de raffinement de maille AGRIF en Méditerranée Nord-Occidentale dans le modèle régional NEMOMED12 pour documenter l'impact de la méso-échelle sur la convection océanique profonde et sur la circulation thermohaline Méditerranéenne. On a de plus réalisé des simulations d'ensemble à état initial perturbé pour documenter l'impact de la variabilité intrinsèque océanique sur la convection. Après avoir extensivement évalué le réalisme de la convection dans le modèle numérique NEMOMED12 grâce aux données de 2012-2013, on étudie avec ce modèle l'impact de la variabilité intrinsèque océanique sur ce phénomène. Sur le cas d'étude comme sur la période historique 1979-2013, la variabilité intrinsèque océanique module largement la géographie du patch convectif, en particulier dans le domaine hauturier. Aux échelles climatiques, la variabilité intrinsèque module largement la variabilité interannuelle du taux de convection. En moyenne climatologique, elle module aussi la géographie de la convection, mais elle impacte marginalement son intensité et les propriétés climatiques des eaux profondes. Enfin, on étudie avec l'outil AGRIF l'impact de la dynamique de méso-échelle sur la convection profonde et sur la circulation thermohaline. Sur le cas d'étude de 2012-2013, la méso-échelle augmente le réalisme de la convection. On montre qu'elle augmente la variabilité intrinsèque de la convection. Sur cette période comme sur la période historique, elle diminue l'intensité moyenne de la convection et réduit les transformations des eaux profondes. On relie principalement son impact sur la convection à une modification de la circulation stationnaire marquée par un repositionnement et une intensification des courants de bord, et la présence d'un méandre stationnaire du Front Baléare. Par ailleurs, sur la période historique, les échanges avec le bassin Algérien sont intensifiés par la méso-échelle, ce qui modifie les propriétés climatiques des masses d'eau. On montre enfin que la signature de la méso-échelle en surface est susceptible d'impacter les échanges air-mer et donc le climat côtier voire régional Méditerranéen. / The northwestern Mediterranean sea, also named the Liguro-Provençal basin, is one of the few places where ocean deep convection occurs. This localized and intermittent phenomenon is one of the main modes of interaction between the deep ocean and the climate system. It is of paramount importance for the vertical redistribution of heat, carbon dioxyde and biogeochemical elements, and therefore for climate and marine biology. The PhD has been carried out in the framework of HyMeX programme, it aims at characterizing the ocean deep convection phenomenon in the Liguro-Provençal basin from the year 2012-2013 case study and at understanding the role of mesoscale dynamics and of the resulting intrinsic ocean variability on deep convection. The PhD work has first focused on characterizing the ocean deep convection phenomenon from observations collected during the 2012-2013 case study. We estimated the winter deep convection and spring restratification rates and an Observing System Simulation Experiment (OSSE) was developed to estimate the associated observation error. We conclude on the validity of MOOSE network observations to estimate the deep convection and restratification rates in the period 2012-2013. We characterize the period as exceptionally convective with a winter deep water formation rate of 2.3±0.5Sv (1Sv=106m³/s) and we estimate for the first time a spring deep water restratification rate of 0.8±0.4Sv. Two novel numerical approaches were developped during the PhD to characterize the roles of mesoscale dynamics and of intrinsic variability in the deep convection phenomenon. We implemented AGRIF grid refinement tool in the northwestern Mediterranean Sea within NEMOMED12 regional model to document the impact of mesoscale on deep convection and on the Mediterranean thermohaline circulation. In addition, we carried out perturbed initial state ensemble simulations to characterize the impact of ocean intrinsic variability on convection. After extensively evaluating the realism of deep convection in NEMOMED12 numerical model thanks to the 2012-2013 observations, we study with this model the impact of intrinsic variability on deep convection. During the case study as well as in the 1979-2013 historical period, intrinsic ocean variability largely modulates the mixed patch geography, particularly in the open-sea domain. At climatic timescales, intrinsic variability modulates largely the deep convection rate interannual variability. On average over the historical period, it also modulates the mixed patch geography, but it impacts marginally its magnitude and the properties of the deep water formed. Finally, we study with AGRIF tool the impact of mesoscale dynamics on deep convection and on the thermohaline circulation. In the 2012-2013 case study, mesoscale improves the realism of the simulated convection. We show that it increases the deep convection intrinsic variability. In this period as well as during the 1979-2013 historical period, it decreases the mean deep convection rate and it reduces deep water transformations. We mainly relate its impact on convection to the modifincation of the stationary circulation characterized by a relocation and an intensification of boundary currents and the presence of a stationary Balearic Front meander. Also, in the historical period, exchanges with the Algerian basin are increased, which modifies water mass climatological properties. Finally, the surface signature of mesoscale is likely to alter air-sea interactions and the coastal to regional Mediterranean climate.
9

Investigation of rockfall and slope instability with advanced geotechnical methods and ASTER images

Sengani, Fhatuwani 03 1900 (has links)
The objective of this thesis was to identify the mechanisms associated with the recurrence of rock-slope instability along the R518 and R523 roads in Limpopo. Advanced geotechnical methods and ASTER imagery were used for the purpose while a predictive rockfall hazard rating matrix chart and rock slope stability charts for unsaturated sensitive clay soil and rock slopes were to be developed. The influence of extreme rainfall on the slope stability of the sensitive clay soil was also evaluated. To achieve the above, field observations, geological mapping, kinematic analysis, and limit equilibrium were performed. The latter involved toppling, transitional and rotational analyses. Numerical simulation was finally resorted to. The following software packages were employed: SWEDGE, SLIDE, RocData, RocFall, DIPS, RocPlane, and Phase 2. The simulation outputs were analyzed in conjunction with ASTER images. The advanced remote sensing data paved the way for landslide susceptibility analysis. From all the above, rockfall hazard prediction charts and slope stability prediction charts were developed. Several factors were also shown by numerical simulation to influence slope instability in the area of study, i.e. sites along the R518 and R523 roads in the Thulamela Municipality. The most important factors are extreme rainfall, steep slopes, geological features and water streams in the region, and improper road construction. Owing to the complexity of the failure mechanisms in the study area, it was concluded that both slope stability prediction charts and rock hazard matrix charts are very useful. They indeed enable one to characterize slope instability in sensitive clay soils as well as rockfall hazards in the study area. It is however recommended that future work is undertaken to explore the use of sophisticated and scientific methods. This is instrumental in the development of predictive tools for rock deformation and displacement in landslide events. / Electrical and Mining Engineering / D. Phil. (Mining Engineering)

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