Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 81-85). Also available via the Internet.

Magnetization processes in a sintered Nd-Fe-B permanent magnet (NEOMAX-35) were examined on a small scale using a Hall-effect microprobe with an active area 75 μm on a side. Probes were made by evaporating bismuth through a stencil mask onto glass slides. Experiments were performed by placing a probe onto the polished pole face of a Nd-Fe-B magnet and inserting the probe-magnet assembly into an electromagnet. Barkhausen steps, indicating rapid domain wall motion, were observed (superimposed upon the blank probe signal) in the demagnetization of a fully magnetized magnet. Magnetization traces for a thermally demagnetized Nd-Fe-B magnet did not exhibit measurable Barkhausen steps until a field of approximately 1.2 T was applied. The following observations were made for two thermally demagnetized samples which were cycled through minor hysteresis loops (maximum applied field of approximately 2 T): (1) virgin magnetization traces did not contain measurable Barkhausen steps, however all other forward and reverse magnetization traces did; (2) the initial reverse magnetization trace exhibited more and larger Barkhausen steps than subsequent traces; and (3) some Barkhausen steps were repeatable, that is, occurring at approximately the same field on each subsequent forward or reverse trace. Hall voltage signals were on the order of millivolts for probe currents of 10 mA.

That change processes are exciting but sometimes hard to implement for organizations is a known fact. But the change process that I am looking into in this study is beyond hard, as this was change that had to be implemented no matter what. This is the story about the project organization whose sole purpose was to create a permanent organization and then almost over night changed into a permanent, operating organization and with the major differences that entailed. What inspired me to do this research was most and foremost a self-experienced life as a ”project worker” for the same operating field as the case organization. The thrill of always stepping into unfamiliar territory and hardly ever having to do things two times was almost addictive. And it was the individual human aspect of this change that caught my interest for this study. How did they experience this massive change and, did they learn from it and how? And as we are all different as human beings, so was each experience different. After a series of two interviews per informant, conducted two years apart, emerged seven categories from the data analysis that had impacts on their experience, two transition categories and five learning categories. For transition emerged the categories of awareness of change and grief process. For learning emerged framework/ structure, psychological ownership, goal orientation/vision, interpersonal relationships and leadership as categories having an impact on their experiences. I used the results from the data analysis and discussed these with the background of different theoretical perspectives. To cover the vast area of aspects that emerged, I have used theoretical perspectives about project organizations vs. permanent organizations, organizational transitions, learning in organizations, psychological ownership, leadership and vision and goal orientation. My three very different informants had also very different roles in the organization and different private situations, which had an impact on their experienced outcomes of the process. For the category goal orientation/ vision my findings suggested that common for all three of them, however, was a lack of an experienced vision bringing them beyond the launch of the project and into the new permanent organization. With such a vision, transforming from project to permanent organization might have been a smoother process.

Thesis (Ph. D.)--University of Hong Kong, 2001. / Includes bibliographical references (leaves 213-227).

Electric machines are indispensable part in modern industry and they are widely used in many applications such as power generation, vehicles, elevator, robot, and so on. Owing to the diversity of the application occasions, different requirements have been proposed. In the applications, such as wind power generation, low-speed, high-torque and high-efficiency electric machines are required to match with the low-speed load. Currently, this problem is handled by either adopting a speed-boost mechanical gear, or using low-speed machine design. The former one causes mechanical wear and tear, audible noise and low efficiency, whereas the latter one increases the generator size and weight as well as raw material cost. In recent years, another option, namely integrating a coaxial magnetic gear into a permanent-magnet (PM) machine has been proposed. This option allows for directly mounting the outer, low-speed shaft with the load while enables the electric machine coupled with the high-speed inner gear to operate at high speeds. However, this magnetic-geared electric machine desires a complex structure, involving two rotating bodies and three air-gaps, which increases manufacture difficulty and cost. The research work of this thesis attempts to solve the speed-matching problem by developing a new electric machine. The incorporation of vernier concept with PM machine gives birth to the permanent-magnet verier (PMV) machine. Different from traditional synchronous machine, the rotor of the PMV machine rotates at a definite fraction of the synchronous speed, as if it were geared down from the high rotating field set up by the stator. The PMV machine, therefore, can be regarded as a combination of a gear with fixed gear ratio and an electric machine. This kind of machine is attractive in applications which require low speed and high torque, and mechanical gearing is undesirable. The main objective of this thesis is to present the design, analysis and control of the proposed PMV machine. After the introduction on mechanical gears, magnetic gears, and low-speed machines, the design details of the proposed outer-rotor PMV machine are provided. Moreover, the working principle, stable torque generation mechanism and structural features are presented. Due to the introduced vernier effect, it is important to perform the finite element analysis (FEA) for the proposed PMV machine. The electric circuit equation and the motion equation are coupled with the Maxwell’s equation to calculate the key parameters of the proposed machine. The analysis results of the magnetic field distributions, air-gap flux density distributions, flux linkages, winding inductances, back electromotive forces (EMFs), cogging torque and static torque are presented in detail. The performances of PMV machine are compared with other machines to show its advantages and disadvantages. The control strategy of the PMV machine as a brushless DC machine is also presented. The conventional 120-degree conducting, dual-closed-loop control strategy is used for speed and torque control and the experimental setup are given. The results are obtained and compared with the simulation results, thus verify the validity of the design. Finally, the potential applications for the proposed PMV machine are suggested. / published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

The purpose for this thesis, "A Pavilion for Time", is to allow an unhindered exploration of phenomenological time. It is to go beyond, to transcend a convention towards empiricism. The result is an uncritical state, unhindered, uncluttered, a place of pure perception, an existential autoclave. As a phenomenological exploration with architecture as the vehicle, this project investigates time as experienced. It is a heuristic excercise. Its goal is to encourage or rather enhance an understanding of phenomenological time. This thesis does not attempt to answer the question "What is time?" but rather, with architecture, examines the question "How do we, as cognizant human beings, exist with time?" / Master of Architecture

Bakgrund: Ungefär 25 000 individer i Sverige lever med någon form av stomi. Stomin innebär en fysisk förändring på kroppen och det i sin tur påverkar upplevelsen av livskvalitet, kroppsbild och sexualitet. Sjuksköterskans stödjande roll blir speciellt viktigt då sexualitet kan upplevas som en privat angelägenhet och blir därför inte spontant adresserad av varken patient eller sjuksköterska och därmed ett åsidosatt ämne. Syfte: Att belysa hur individer med en permanent intestinal stomi upplever sin sexualitet. Metod: En litteraturöversikt som baseras på elva vetenskapliga originalartiklar, hämtade ur databaserna CINAHL Complete, PubMed, Medline och DOAJ. Artiklarna valdes ut efter kritisk granskning, därefter översattes, analyserades och sammanställdes i teman och underteman. Resultat: Resultatet utmynnade i sex teman. Att alltid ha en påse som hänger med som beskrev hur stomins fysiska närvaro påverkade. Stomin som en källa till rädsla som beskrev rädslor för lukt, läckage och ljud under intima stunder samt en partners reaktion. Upplevelsen av förluster till följd av stomin som beskrev de förluster som individen upplevde påverkade sexualiteten. Att hantera stomins påverkan på sexualiteten som beskrev tillvägagångssätt för att hantera upplevelsen av sexualiteten i relation till stomin. Behov av stöd beskrev vikten av stöd för att kunna hantera sexualiteten i relation till stomin. När upplevelsen av sexualitet förbättras av stomin, som beskrev positiva upplevelser till följd av att grundsjukdomen botats. Diskussion: Resultatet diskuterades och problematiserades utifrån konsensusbegreppet människa, Virginia Henderssons omvårdnadsteori Grundprinciper för patientvårdande verksamheter och vetenskapliga artiklar.

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

Thesis (Ph. D.)--University of Hong Kong, 2005. / Also available in print.