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1
Lindberg, Curt. "Leading volunteers : power relations and values in organizations." Thesis, University of Hertfordshire, 2007. http://hdl.handle.net/2299/14361.
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This thesis sheds new l.ight on internal dynamics of nonprofit associations - nonprofit organizations reliant on significant volunteer participation. It represents one ofthe first research efforts to deal with power relations and the paradoxical, conflictual nature of values in the context of leading volunteers in nonprofit associations. This thesis mounts a significant challenge to the widely accepted nonprofit management literature which is firmly grounded in the systems thinking tradition and which contends values serve only positive purposes and leaders must ensure there is little contention over values. While this research affirms the benefits of values in attracting volunteers and enabling coordinated action among volunteers, it also argues strongly that such a single- minded focus is a severe handicap to organizations interested in change and adaptation. This is because conflict and difference are essential in the change process. Another limitation of the orthodox literature is the portrayal ofa leader's power position relative to volunteers as one of significant dependency. This research concludes that the relationship is characterized by significant interdependency. Such a conclusion is based on the tendency for volunteers to imagine an ideal future achieved by joining in mutual action with others. Because volunteers need support and participation by leaders in the realization of this better future, a dependency is 'created. This different way of understanding values and power opens up a broader role for nonprofit executives. Not only must they work with volunteers to enable the productive dimensions ofvalues to be realized, but they must work with the paradoxical nature of values and the inevitable conflicts and anxiety which emerge. By paying attention to daily patterns ofinteraction, resisting tendencies to deny or deflect conflicts, noticing how one participates in conversations and whether the results are repetitive or free-flowing and creative, nonprqfit association leaders can help create more adaptable and c~angeable organizations. These findings were informed by an intensive examination ofmy experiences as a leader in a nonprofit association and ofcomplex responsive processes theory of Stacey and colleagues, comple~ity science, and the scholarship of sociologist Norbert Elias. They emerged from a series ofnarratives about my experiences, serious reflections on these narratives within the doctoral program community, and study of literature suggested by themes that arose in the course of the research.
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Banks, Amy Camille Connelly. "Shakespeare's Leading Franciscan Friars: Contrasting Approaches to Pastoral Power." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8931.
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A popular perception persists that the Franciscan friars of Romeo and Juliet and Much Ado About Nothing bear heavy blame for the results of the play, adversely for Friar Lawrence and positively for Friar Francis. The friars do formulate similar plans, but their roles vary significantly. I contrast their approaches using Michel Foucault's definition of pastoral power, with Friar Lawrence as an overly manipulative friar controlling the lovers in spiritual matters, and Friar Francis as a humble military friar returning from the Wars of Religion to share his authority with others. This distinction--especially with Friar Lawrence appearing chronologically first--demonstrates Shakespeare as more fluid in religious themes, contrary to a significant body of scholarship that asserts Shakespeare's pro-Catholic sympathies.
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Williams, Richard Wynne. "Leadership, power, ethics : leading and managing in a performative culture." Thesis, University of Hertfordshire, 2004. http://hdl.handle.net/2299/14192.
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This thesis is a study of the experience of leadership. The aim throughout the thesis is to find ways of making sense of the idea of leadership by reference to the everyday routines of organisational life. The thesis is therefore preoccupied with the idea of "doing leadership" in the context of enacting specific job roles in organisations. Such an approach to studying leadership is in contrast with other possibilities that may be more theoretical or speculative in their view of what being in a senior leadership role in an organisation is actually like. I completed this thesis whilst working as a principal/CEO of two large inner city colleges in the tertiary sector of the UK. My thesis therefore reflects also the experience of enacting a leadership role bound up with the wider agenda of public service reform. In making sense of this context I apply and develop the idea of "performativity" as signifying a particular culture (rooted expectations, ways of working, generalised assumptions about practice) that are pervasive in public sector organisations. I explore the significance of this culture for the way in which those in leadership roles (and inter alia, their subordinates) experience identity. I suggest too that the cult of performance management makes contingent a pervasive sense of ontological insecurity for those working in political, administrative and organisational leadership roles enacted in this context. Against this background, I propose four key themes as a way of understanding what doing leadership in organisations entails: the administration of power and authority; the practice of ethics; an iconographic role of significance to others in an ongoing generalised process of identity formation; creative action. Finally, in reflecting upon the idea of leadership development, I argue that development should be understood as a movement in the emotional responsiveness (emotivity) of individuals to their situation and context. This I suggest arises from the practice of reflexivity. It is the ability to do this with rigour on the part of those in leadership roles that creates also new possibilities for an ethics of relating in organisations centred on the ideas of participation and emergence. The thesis comprises four project studies. The first is a reflective narrative account of how I came to join the DMan programme in 2002. The second explores issues of leadership relative to thinking about group processes and traditions of group analysis. The third study examines issues of identity as they emerge in the ways in which processes of power relating emerge in group interactions. The fourth study explores these same themes but in relation to the tensions that emerge in the interplay of norms and values informing human actions and conduct. The thesis includes a fifth study which focuses on issues of methodology and the significance of personal narratives of experience to a wider process of academic research. This thesis is explicitly one written by reference to a particular theoretical perspective. This perspective is best described by reference to the idea of complex responsive processes. I account for and describe this perspective in each of the project studies. It was with a view to working explicitly with this perspective that I joined the DMan programme. The work in this thesis is intended to constitute an active intellectual engagement with the idea of complex responsive processes. It is not the intention of the thesis simply to exemplify a fixed set of ideas. The thesis is therefore aiming also to be a contribution to the thinking of complex responsive processes as a set of ideas still in development. I remain committed to the view that the idea of complex responsive processes provides a powerful medium of critical ideas through which life in organisations and patterns of human relating can be understood. Whilst the thesis does not set out to justify a case for the idea of complex responsive processes, a recurrent theme is an exploration of the implications for understanding organisational life in general that arise from adopting the perspective of complex responsive processes relative to those presented by other traditions of thinking.
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Benocci, Beatrice Concetta Caterina. "La Germania necessaria. L'emergere di una nuova leading power, tra potenza economica e modello culturale." Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2366.
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2014 - 2015The work is a contribution to the understanding of one of the most interesting topic in our history: the Germany's transformation from an aggressive state to an international power, today shared and necessary. The volume is divided into four different topics: the first, dedicated to the close relationships between Europe and Germany; the second, is about the path of liberation followed by Germany from the constraints of World War II - the only prerequisite for the recovery of the German central role in the international scene; the third, dedicated to the German economy, itself a driving force of the political and cultural success of the German nation; a fourth, dedicated to the constituent elements of the German cultural model. Finally, the book analyzes the difficult German relationship with rearmament both atomic and conventional. It follows an articulated analysis on the concept of power and on the role now played by Germany in the European and international scene. [edited by Author]
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Weaver, Mark R. "Organizational Leading in the Policing Power-Public Trust Relationship| An Exploratory Mixed Methods Case Study." Thesis, The University of New Mexico, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10642917.
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This mixed methods study employed an instrumental single-bounded case approach to explore how a policing executive develops and sustains an ethically performing organization, given the phenomenological "policing power-public trust" relationship. Policing is foundational to rule of law and ethical performance in policing is fundamental to developing and sustaining a healthy policing power-public trust relationship. A review of relevant policing literature reveals a history of tension and conflict in this complex relationship. The literature review included relevant social contract theory, history of policing and the policing power-public trust relationship, relational leadership, servant leadership, transformational learning and leadership and change management. Organizational related literature included relevant aspects of organizational learning, performance, change and transformation.
Qualitative interviews were conducted with the policing executive and a quantitative survey instrument was pilot study validated and subsequently administered to the organization's sworn personnel. From qualitative and quantitative data collected, analyzed and integrated, 26 findings emerged. Further analysis of the findings resulted in four emergent themes. Results suggest that in a highly dynamic environment, a pragmatic role-modeling and holistic leadership strategy to drive ethical performance by leveraging a culture of accountability, best practice, and change readiness has potential external ecological application. In turn, ethical performance may generate public trust when an organization leverages innovative capacity to connect with its community through a robust strategy of active communication and transparency.
Although emergent findings or themes may have limited ecological application with similarly situated chiefs, organizations and communities, external generalizability is not foreseeable. Recommendations for future research include use of a multiple case study methodology to focus on one or more themes identified in this inquiry. A study could be undertaken to identify how leaders in organizations with relatively stable environments lead their respective organizations to perform ethically and build public trust. Given this organization's current success and expected future benefits from having developed and implemented a robust community engagement strategy, a study of similarly effective external communication strategies could be undertaken to identify the relative value and community impact.
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Mayor, Vina. "Staying power : the career journeys of leading African, African-Caribbean and Asian nurses in England." Thesis, University of Warwick, 2002. http://wrap.warwick.ac.uk/1301/.
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This thesis is the first research of its kind to examine the career journeys of leading African, African-Caribbean and Asian, male and female, nurses' careers in England, and adds substantially to our extremely limited knowledge concerning the black professional class in Britain. It examines the barriers, the career opportunities, personal motivations and cultural capital that the respondents drew upon to negotiate and deal with racialised social and professional structures from the entry gate into nursing to their current appointments as senior managers in nursing, nurse management, research or nurse education. This study has considerable policy relevance in view of the National Health Service (NHS) commitment to recruit qualified nurses from overseas to combat the nursing labour market shortages. The research was conducted in three phases over a period of six years using an oral biography / life history approach to obtain narratives from eighty-eight black respondents working and domiciled in England. It revealed that the group of black nurses who had reached senior levels had became highly qualified and had contributed to service, policy, education and research development at the local level. There is also substantial evidence of their contribution to nursing at national and international levels. The findings also reveal that respondents experienced self-reported unequal treatment at the entry gate and throughout their career. The staying power and career journeys of these respondents show that the intersection between social structures of class, 'race' / ethnicity and gender, and personal agency is important in shaping careers and is influenced by social, professional, political shifts and constraints, suggesting that how individuals negotiate and deal with racialised barriers is linked to both their 'stocks' of cultural capital and their personal motivations and determinations. This structure-agency relationship counters much of the research on 'race' and occupation which has looked primarily at racialised structural barriers to advancement.
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Henneaux, Pierre. "A two-level Probabilistic Risk Assessment of cascading failures leading to blackout in transmission power systems." Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209433.
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In our society, private and industrial activities increasingly rest on the implicit assumption that electricity is available at any time and at an affordable price. Even if operational data and feedback from the electrical sector is very positive, a residual risk of blackout or undesired load shedding in critical zones remains. The occurrence of such a situation is likely to entail major direct and indirect economical consequences, as observed in recent blackouts. Assessing this residual risk and identifying scenarios likely to lead to these feared situations is crucial to control and optimally reduce this risk of blackout or major system disturbance. The objective of this PhD thesis is to develop a methodology able to reveal scenarios leading to a blackout or a major system disturbance and to estimate their frequencies and their consequences with a satisfactory accuracy.A blackout is a collapse of the electrical grid on a large area, leading to a power cutoff, and is due to a cascading failure. Such a cascade is composed of two phases: a slow cascade, starting with the occurrence of an initiating event and displaying characteristic times between successive events from minutes to hours, and a fast cascade, displaying characteristic times between successive events from milliseconds to tens of seconds. In cascading failures, there is a strong coupling between events: the loss of an element increases the stress on other elements and, hence, the probability to have another failure. It appears that probabilistic methods proposed previously do not consider correctly these dependencies between failures, mainly because the two very different phases are analyzed with the same model. Thus, there is a need to develop a conceptually satisfying probabilistic approach, able to take into account all kinds of dependencies, by using different models for the slow and the fast cascades. This is the aim of this PhD thesis.
This work first focuses on the level-I which is the analysis of the slow cascade progression up to the transition to the fast cascade. We propose to adapt dynamic reliability, an integrated approach of Probabilistic Risk Analysis (PRA) developed initially for the nuclear sector, to the case of transmission power systems. This methodology will account for the double interaction between power system dynamics and state transitions of the grid elements. This PhD thesis also introduces the development of the level-II to analyze the fast cascade, up to the transition towards an operational state with load shedding or a blackout. The proposed method is applied to two test systems. Results show that thermal effects can play an important role in cascading failures, during the first phase. They also show that the level-II analysis after the level-I is necessary to have an estimation of the loss of supplied power that a scenario can lead to: two types of level-I scenarios with a similar frequency can induce very different risks (in terms of loss of supplied power) and blackout frequencies. The level-III, i.e. the restoration process analysis, is however needed to have an estimation of the risk in terms of loss of supplied energy. This PhD thesis also presents several perspectives to improve the approach in order to scale up applications to real grids.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
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Binns, Jennifer. "The possibilities of relational leading : rethinking gender, power, reason and ethics in leadership discourse and practice." University of Western Australia. UWA Business School, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0024.
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This dissertation is located within debates around post heroic leadership. It takes as axiomatic the argument that we need to rethink leadership in ways that are not irredeemably bound to ideals of instrumental rationality, hegemonic masculinity and competitive individualism but are, instead, informed by the ‘feminine’ principles of mutuality, care and what Deborah Kerfoot (1999) terms ‘emotional intimacy’. I call this alternative construct ‘relational leading’ in order to underline my position that leading is about connecting (in an authentic, empathic and ethical way) with others and across functions. This alternative understanding of leadership draws on Joyce Fletcher's (1999) model of a relational practice grounded in the ‘disappeared’ feminine. While positing relational leading as a feminist alternative to dominant masculinist conceptions of leadership, this dissertation attempts to avoid reinvoking dualistic representations. It does this by thinking leadership as a practice undertaken by complex, embodied subjects whose capacity to creatively transcend binaries of masculine/feminine, reason/emotion, and power/powerlessness opens up possibilities for, in the words of Amanda Sinclair (1998), ‘doing leadership differently’. There is, however, a cautionary note in the recognition that identities and practices are discursively regulated or culturally patterned, so that men and women who ‘do’ leadership face constant pressures to masculinise or feminise their identities. Such processes perpetuate both gender stereotypes and the privileging of a masculinised notion of leadership that Sinclair (1998) calls the heroic archetype. Nonetheless, the dissertation ends on an optimistic note, proposing reflexive practice as the agent of change and the condition for being/becoming a practitioner of relational leading, against the grain of masculine heroism and rational instrumentalism.
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Fox, Alison. "Leading collaborative professional enquiry : implications for teachers, chartered teachers and their managers." Thesis, University of Stirling, 2009. http://hdl.handle.net/1893/1756.
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This research explores the implications of the practice of collaborative professional enquiry on professional re-formation and development. A series of case studies focuses on four aspiring Chartered Teachers as they lead collaborative enquiries in two schools. The case studies take account of the experiences of the teachers in the collaborative groups, as well as the managers in both schools. Using a Foucauldian theoretical framework, relations of power between all participants are explored. This reveals that active positioning is in operation. The Chartered Teachers are positioned in an ‘in-between’ space: neither teacher nor manager, and this appears to have allowed them to construct and negotiate new possibilities, contributing to their developing professional identities. While this challenged the established hierarchies in schools, the teachers reported that undertaking collaborative professional enquiry under the leadership of the Chartered Teachers, benefitted themselves and their pupils, appearing to offer opportunities to demonstrate an active professionalism which was in contrast to the expectations of their managers. The findings raise several issues for consideration by the profession. These include a recommendation that collaborative professional enquiry is encouraged as a core pedagogical resource. The research also highlights the need for policy makers to take account of the way power is exercised in and on schools when developing new policies and evaluating the success of current ones. It is argued that genuine and open dialogue is necessary and it is recommended that the national CPD framework should reconsider the current practice of supporting distinctive pathways within the profession.
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De, Dominici Gregory. "Understand and predict the power threshold leading to reduced turbulent transport at the edge of tokamak plasma." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0320.
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Les effets diamagnétiques ont longtemps été pris en compte car ils sont à l'origine d'une instabilité clef dans les plasmas de bord, les ondes de dérives. En incluant ces effets, on permet la compétition entre lesdites ondes de dérives et l'instabilité d'interchange (présente de manière native dans le code) due à la courbure du champ magnétique. Cette compétition est étudiée dans ce travail au travers de simulations à gradient fixe. Ces effets sont stabilisants aux résistivités proches de l'expérience. Les effets des fluctuations magnétiques sont d'autant plus déstabilisantes que la résistivité est basse. En revanche, les temps caractéristiques de la turbulence sont très fortement réduit par la prise en compte de ces fluctuations. Il devient donc plus difficile en régime électromagnétique de déchirer les vortex turbulents comparé à un cas électrostatique, et donc il en résulte une augmentation du seuil en puissance dans les simulations electromagnétiques. On montre enfin que plus la masse de l'isotope est élevée, au plus les phénomènes turbulents sont faibles. Nous présentons l'auto-génération de barrière de transport en régime électromagnétiques delà d'un seuil en puissance, avec une dynamique semblable aux transition L-H, par le biais de simulations à flux fixe. Nous montrons qu’une puissance plus élevée en régime électromagnétique qu'en électrostatique est nécessaire pour déchirer les vortex, soit que le temps de cisaillement soit inférieur aux temps caractéristiques de la turbulence. Ensuite, l'isotope a été changé, le seuil en puissance de la transition L-H a diminué via une stabilisation de la turbulence liée à une masse d'isotope plus grandeA model based on a model which natively contained turbulence and turbulence driven flow. It has been improved to include the diamagnetic effects, the magnetic fluctuations, and in this work, we study the parametric dependencies of the observed L-H transition power threshold with respect to the ion mass. By including the diamagnetic effects in our model, we allow the competition between the drift waves and the interchange instabilities. This competition is here studied using fixed gradient simulation. We show in this work that the diamagnetic effects are stabilizing for a resistivity close to experimental conditions. Electromagnetic effects lead to more unstable modes at realistic resistivities. Moreover, a quasilinear estimation of the turbulent flux is able to qualitatively grasp the competition between the drift waves and the interchange and the behaviour of the nonlinear electrostatic turbulent flux with resistivity and plasma beta. Another parametric dependency of the turbulence is studied, by changing the mass of the isotope. This is known as the isotope effect. We show here that the turbulence is reduced when the ion mass is increased. Finally, the characteristic times of the turbulence are studied.Magnetic fluctuations have a dramatic effect on correlation times of the turbulence, by drastically reducing them. Accounting for these results, we present in this work the auto-generation of a transport barrier with electromagnetic simulations of edge turbulence, when the heat power is higher than a threshold, using flux-driven simulations. We have then changed the isotope, and correspondingly to experiments, the power threshold is lower for higher isotope mass
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Chroscik, Angela, and Malin Lake. "Disclosure of CEO bonus plans : A study of twenty leading EU banking companies." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Företagsekonomi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-21275.
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The CEO bonus of banking companies has become a hot media topic around the world accelerated by the recent financial crisis of 2007-2008 where the excessive pay and risk-taking in the banking sector were recognized. This has raised public concerns around executive remuneration and the transparency of the companies. According to the regulations, the bonus of the CEO is indexed to the firm´s performance. However, the compensation of many CEO’s has been paid out during the financial crisis although the firms have lost money. This has consequently led to rigorous regulations of the financial institutions with the attempt to ensure long-term focus and consider outstanding risk through variable remuneration payments. Although the remuneration, and specifically annual bonus, has caught a lot of attention by the public and the media, it has been mostly overlooked by regulatory authorities and academics up until today. This research represents the first attempt to examine the disclosure and transparency of CEO annual bonus plans of twenty leading EU banks through the employment of in-depth and descriptive approach.. The purpose of this study is to explore the issue of CEO annual bonus plan with respect to the disclosure of the information provided in the banking companies’ financial reports of 2011. The level of transparency of the companies are scrutinized and measured accordingly to five bonus features, which may contribute to the transparency of annual bonus plans. The bonus plan is regarded as transparent if the majority of the following bonus criteria are fulfilled by the companies; (1) the application of simple targets through a single performance condition; (2) the application of published targets accessible to shareholders; (3) the disclosure of methods applied in order for shareholders and other stakeholders to determine whether the given performance target(s) has been fulfilled; (4) bonus payments in form of cash; (5) the disclosure of annual bonus cap. The findings of this study show that a significant part of the banks can be considered as non-transparent due to the failure of fulfilling the given bonus plan features, meaning that the issue of disclosure and transparency of annual bonus plans should raise concern for shareholders and regulators, both on the EU-level and nationally. This study evidently shows that the level of information disclosed as to bonus plans of CEO various tremendously between the countries and sometimes also between the companies in the same country, which indicate the issue of disclosure and transparency of annual bonus plans need to be enhanced through regulations.
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VIEIRA, FRANCISCO ANIZIO. "THERMO-ACCUMULATION: AN EFFECTIVE ALTERNATIVE FOR INCREASING THE POWER LOAD FACTOR IN ELECTRICITY RETAILING LEADING TO DIFFERENTIATED TARIFF BILLINGS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32996@1.
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Desenvolvida no âmbito da linha de pesquisa Metrologia para Energia, a presente dissertação de mestrado tem como objetivo validar os benefícios da tecnologia da termoacumulação como alternativa técnica e economicamente viável para deslocamento de cargas elétricas em períodos de grande utilização. O projeto de pesquisa teve como motivação o estudo de alternativas tecnológicas para viabilizar tarifas diferenciadas. A metodologia utilizada incluiu a revisão da literatura especializada sobre regulação tarifária e termoacumulação; desenvolveu estudos de sistemas de distribuição subterrâneos e aéreos situados em regiões de grande demanda de energia elétrica no horário comercial e desenvolveu análise de sensibilidade técnico-econômica visando a proposição de alternativas tarifárias e políticas de deslocamento de carga. O trabalho se desenvolveu no contexto da segunda revisão tarifária do setor elétrico, que busca repartir os ganhos de eficiência obtidos pelos agentes do setor elétrico com os seus consumidores. Dentre os resultados do trabalho destacam-se: (i) a comprovação da viabilidade da aplicação da termoacumulação em sistemas de climatização, (ii) a redução de custos de operação e implantação de subestações de energia elétrica para consumidores de sistemas de refrigeração e (iii) e proposição de uma tarifa diferenciada que permite a mudança do perfil de carga de sistemas de refrigeração comerciais. Estudos realizados mostraram que a termoacumulação pode gerar redução dos custos de energia elétrica da ordem de 30 a 45 por cento. Como conclusões, o trabalho reconhece a importância de se implantar políticas que privilegiem novas alternativas tarifárias e ressalta os benefícios que resultam da adoção dessa tecnologia alternativa para o meio ambiente.Studies have shown that thermo-accumulation is an attractive technology to increase the electric power load factor which can lower tariff billings in electricity retailing (30-45 percent), the motivation for this research project. The aim of the present M.Sc. dissertation is to validate the technological benefits of thermo-accumulation applied to the electric sector as an economically feasible alternative for power load displacement at peak mode. The methodology included a literature survey on tariff billings and the regulation of the electric sector; a study of aerial and underground distribution systems at locations of high power load demand; a technical-economic analysis (consumption and tariff) of power substations. Developed within the context of tariff billing revision where the electric sector shared energy-efficient gains with customers, the research project suggests alternate tariff schemes and power load displacement policies. Three major results were found: (i) the feasibility of thermo-accumulation in acclimatization; (ii) the reduction of operational cost of electricity for commercial air-conditioning users; (iii) a proposal for differentiated retailing tariff billings. To highlight the conclusions of the work, the use of the thermo-accumulation technology by electric companies was shown to be unmistakable. On the one hand it provides better tariff schemes for consumers and on the other it is environmentally friendly.
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Hawkes, Joshua Mahlon. "The Simulation and Study of Conditions Leading to Axial Offset Anomaly in Pressurized Water Reactors." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7612.
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Axial offset anomaly (AOA) in pressurized water reactors (PWR) refers to deviation of the measured neutron flux in the top half of the core from the predicted values. Among other difficulties, AOA reduces the shutdown margin, and may force the plant to reduce power output. AOA is believed to be caused by three related phenomena occurring in the core while operating at full power: sub-cooled nucleate boiling concentrated mainly in the upper half of the core, corrosion product deposition on the cladding surface (crud), and the deposition of boron within the porous crud layer in regions of vigorous sub-cooled boiling.
This study replicates the conditions within the PWR primary coolant; specifically, the temperature, pressure, peak surface heat flux, coolant velocity and water chemistry are simulated in order to produce prototypical crud on an electrically heated Zircaloy-4 test element. At the conclusion of each test run, the heated Zircaloy-4 test element is rapidly isolated from the coolant in order to trap any soluble boron species that may be present in the crud layer. The results of this investigation indicate that prototypical crud with significant boron deposition can be produced. The deposited boron compound has been determined to be lithium tetraborate (Li2B4O7). Comparative experiments have been run to determine the effect of coolant pH, concentration and type of additives, and duration of exposure on the thickness of the crud deposit. The data obtained in this investigation can be used to validate mechanistic models for crud deposition and AOA in pressurized water reactors.
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Louganski, Konstantin. "Generalized Average-Current-Mode Control of Single-Phase AC-DC Boost Converters with Power Factor Correction." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27331.
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The dissertation presents a generalized average-current-mode control technique (GACMC), which is an extension of the average-current-mode control (ACMC) for single-phase ac-dc boost converters with power factor correction (PFC). Traditional ACMC is generalized in a sense that it offers improved performance in the form of significant reduction of the current control loop bandwidth requirement for a given line frequency in unidirectional and bidirectional boost PFC converters, and additional functionality in the form of reactive power control capability in bidirectional converters. These features allow using a relatively low switching frequency and slow-switching power devices such as insulated-gate bipolar transistors (IGBTs) in boost PFC converters, including those designed for higher ac line frequencies such as in aircraft power systems (360â 800 Hz). In bidirectional boost PFC converters, including multilevel topologies, the GACMC offers a capability to supply a prescribed amount of reactive power (with leading or lagging current) independently of the dc load power, which allows the converter to be used as a static reactive power compensator in the power system.
A closed-loop dynamic model for the current control loop of the boost PFC converter with the ACMC has been developed. The model explains the structure of the converter input admittance, the current phase lead phenomenon, and lays the groundwork for development of the GACMC. The leading phase admittance cancellation (LPAC) principle has been proposed to completely eliminate the current phase lead phenomenon and, consequently, the zero-crossing distortion in unidirectional converters. The LPAC technique has been adapted for active compensation of the input filter capacitor current in bidirectional boost PFC converters.
The dynamic model of the current control loop for bidirectional boost PFC converters was augmented to include a reactive power controller. The proposed control strategy enables the converter to process reactive power and, thus, be used as a reactive power compensator, independently of the converter operation as an ac-dc converter.
Multiple realizations of the reactive power controller have been identified and examined in a systematic way, along with their merits and limitations, including susceptibility to the ac line noise. Frequency response characteristics of reactive elements emulated by means of these realizations have been described.
Theoretical principles and practical solutions developed in this dissertation have been experimentally verified using unidirectional and bidirectional converter prototypes. Experimental results demonstrated validity of the theory and proposed practical implementations of the GACMC.
Ph. D.
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Sun, Jing. "New leading/trailing edge modulation strategies for two-stage AC/DC PFC adapters to reduce DC-link capacitor ripple current." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/5801.
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AC/DC adapters mostly employ two-stage topology: Power Factor Correction (PFC) pre-regulation stage followed by an isolated DC/DC converter stage. Low power AC/DC adapters require a small size to be competitive. Among their components, the bulk DC-link capacitor is one of the largest because it should keep the output voltage with low ripple. Also, the size of this capacitor is penalized due to the universal line voltage application. Synchronization through employing leading edge modulation for the first PFC stage and trailing edge modulation for the second DC/DC converter stage can significantly reduce the ripple current and ripple voltage of the DC-link capacitor. Thus, a smaller DC-link capacitance can be used, lowering the cost and size of the AC/DC adapter. Benefits of the synchronous switching scheme were already demonstrated experimentally. However, no mathematical analysis was presented. In this thesis, detailed mathematical analyses in per-unit quantity are given to facilitate the calculation of the DC-link capacitor ripple current reduction with Leading/Trailing Edge Modulation strategies. One of the limitations of leading/trailing edge modulation is that the switching frequencies of the two stages need to be equal to achieve the best reduction of the DC-link capacitor ripple current. The DC-link capacitor ripple current will become larger if the switching frequency of the DC/DC converter is larger than that of the PFC pre-regulator, which blocks us to employ higher frequency for isolated DC/DC converter to reduce its transformer size. This thesis proposed a new Leading/Trailing Edge Modulation strategy to further reduce the DC-link bulk capacitor ripple current when switching frequency of DC/DC converter stage is twice the switching frequency of PFC stage. This proposed pulse width modulation scheme was verified by simulation. Experimental results obtained through digital control based on FPGA are also presented in this thesis.
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Jonsson, Alexander. "A ‘snapshot’ of Swedish media’s portrayal of immigrants and refugees leading up to the 2018 election : A qualitative critical discourse analysis from Dagens Nyheter and Svenska Dagbladet." Thesis, Linnéuniversitetet, Institutionen för samhällsstudier (SS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-79903.
Full textAbstract:
Immigration is a topic that is not an uncommon occurrence within Sweden, especially in regards to the long history of wars and crisis occurred since the beginning of the 21st century. It could take form of individuals fleeing for their lives as refugees from conflict, or as economic migrants seeking a higher quality of life in a new country. The aim of the study was to analyze the critical discourse on how the Swedish media portrays immigrants and refugees in line with Norman Fairclough’s three-dimensional framework and Dijk’s textual analysis from a socio-cognitive approach. The purpose was to focus on gaining an insight on how Swedish media portrays immigrants and refugees. The newspapers that were analyzed was Dagens Nyheter (DN) and Svenska Dagbladet (SvD) which are two of the largest newspapers in Sweden. The results showed that there was a tendency of the Swedish media to lean toward left-wing discourse in comparison to the rest of Europe. However, the perspective of ‘us’ vs ‘them,’ negative economic costs of refugees and less of a voice for the refugees and migrants was found. Some positive actions for future reporting of immigrants and refugees is to give newcomers to Sweden a stronger voice in the media, where a full account of the report is evident and to utilize neutral diction such as, ‘nyanlända’ when addressing refugees or migrants.
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Nykvist, Marcus, and Eric Månsson. "The Stock Market as a Leading Macroeconomic Indicator." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-106644.
Full textAbstract:
This article goes on to explain and seek if there is any predictive power in the stock markets toward GDP. Put in other words, this study examines whether or not the stock market can be seen as a leading indicator toward GDP for the ten biggest economies measured by GDP in the year 2020. What can be concluded from the results discussed in the analysis section is that the best predictability is when the stock market leads GDP with three to five quarters. In earlier studies on the same topic, the same results can be concluded. However, these previous studies have all shown an extended predictive period between one and five quarters, compared to our results which showed three to five quarters. One note worth mentioning is that we obtained contradictory results depending on if the tests were implemented for each country individually through time series data analysis, or collectively through panel data analysis. Our conclusion was drawn with the panel data analysis as the underlying truth, as it is viewed as more efficient and informative while also being a more suitable tool for studying the dynamics of change.
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Nabawy, Mostafa. "Design of insect-scale flapping wing vehicles." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/design-of-insectscale-flapping-wing-vehicles(5720b8af-a755-4c54-beb6-ba6ef1a13168).html.
Full textAbstract:
This thesis contributes to the state of the art in integrated design of insect-scale piezoelectric actuated flapping wing vehicles through the development of novel theoretical models for flapping wing aerodynamics and piezoelectric actuator dynamics, and integration of these models into a closed form design process. A comprehensive literature review of available engineered designs of miniature rotary and flapping wing vehicles is provided. A novel taxonomy based on wing and actuator kinematics is proposed as an effective means of classifying the large variation of vehicle configurations currently under development. The most successful insect-scale vehicles developed to date have used piezoelectric actuation, system resonance for motion amplification, and passive wing pitching. A novel analytical treatment is proposed to quantify induced power losses in normal hover that accounts for the effects of non uniform downwash, wake periodicity and effective flapping disc area. Two different quasi-steady aerodynamic modelling approaches are undertaken, one based on blade element analysis and one based on lifting line theory. Both approaches are explicitly linked to the underlying flow physics and, unlike a number of competing approaches, do not require empirical data. Models have been successfully validated against experimental and numerical data from the literature. These models have allowed improved insight into the role of the wing leading-edge vortex in lift augmentation and quantification of the comparative contributions of induced and profile drag for insect-like wings in hover. Theoretical aerodynamic analysis has been used to identify a theoretical solution for the optimum planform for a flapping wing in terms of chord and twist as a function of span. It is shown that an untwisted elliptical planform minimises profile power, whereas a more highly tapered design such as that found on a hummingbird minimises induced power. Aero-optimum wing kinematics for hovering are also assessed. It is shown that for efficient flight the flapping velocity should be constant whereas for maximum effectiveness the flapping velocity should be sinusoidal. For both cases, the wing pitching at stroke reversal should be as rapid as possible. A dynamic electromechanical model of piezoelectric bending actuators has been developed and validated against data obtained from experiments undertaken as part of this thesis. An expression for the electromechanical coupling factor (EMCF) is extracted from the analytical model and is used to understand the influence of actuator design variables on actuator performance. It is found that the variation in EMCF with design variables is similar for both static and dynamic operation, however for light damping the dynamic EMCF will typically be an order of magnitude greater than for static operation. Theoretical contributions to aerodynamic and electromechanical modelling are integrated into a low order design method for propulsion system sizing. The method is unique in that aside from mass fraction estimation, the underlying models are fully physics based. The transparency of the design method provides the designer with clear insight into effects of changing core design variables such as the maximum flapping amplitude, wing mass, transmission ratio, piezoelectric characteristics on the overall design solution. Whilst the wing mass is only around 10% of the actuator mass, the effective wing mass is 16 times the effective actuator mass for a typical transmission ratio of 10 and hence the wing mass dominates the inertial contribution to the system dynamics. For optimum aerodynamic effectiveness and efficiency it is important to achieve high flapping amplitudes, however this is typically limited by the maximum allowable field strength of the piezoelectric material used in the actuator.
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Covington, LaKesha Nicole. "From 9/11 to Iraq: Analysis and critique of the rhetoric of the Bush Administration leading to the war in Iraq." CSUSB ScholarWorks, 2005. https://scholarworks.lib.csusb.edu/etd-project/2916.
Full textAbstract:
The project investigated the events that led the United States from September 11, 2001 to the current war in Iraq. The specific time frame examined was the period beginning on September 11, 2001 and ending with the first pre-emptive attacks in Iraq on March 19, 2003.
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王世明. "On the PRC''S Leading-power Policy and “Partner Relationships”." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/93011912554839986687.
Full text
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Mirza, Alex. "Power Counting Rules for Next-to-Leading Order Hard Thermal Loop Theory." 2012. http://hdl.handle.net/1993/5313.
Full textAbstract:
The goal of this thesis is to determine power counting rules at next-to-leading order (NLO) in the hard
thermal loop (HTL) resummation. The original paper by Braaten and Pisarski discusses NLO HTL resummation
and argues that there are potentially three types of contributions. We start by studying these terms
in the specific case of the boson and fermion self energies in QED and QCD, as these quantities have been
calculated in previous literature. For the real and imaginary parts of the fermion and gluon self energies,
one needs to calculate only one type of term, as the other two are found to be subleading. However, for the
real and imaginary parts of the photon self energy, all types of terms need to be calculated.
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John, Chiang, and 江榮發. "A Study on Financial Performance of Global Leading Wind Power Equipment Firms." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/60571858243019056798.
Full textAbstract:
碩士國立高雄應用科技大學
商務經營研究所
98
Wind power is one of ways to protect the global warming. The growing consciousness of environment leads many foreign countries to carry out wind power to protect the earth. Taiwan lacks of natural power, however, it has excellent wind power potential. Therefore, wind power becomes the best choice to develop reusable energy under such situations in Taiwan. The purpose of this thesis is to investigate the current situations of wind power in Taiwan and many countries, and analyze the financial performance of global leading wind power equipment firms. Results are as follows: 1. Many developed countries such as U.S.A., Canada, European, Japan, and China have developed wind power actively and gain outcomes positively. 2. Wind power is focused on Taipower Co. in Taiwan. Other firms are still in the infant stage. In addition to enter this market actively, the support of government is still needed. 3. As to the financial performance of global wing power equipment leading firms, R&D and current ratio are positively related to the ratio of net income before tax. However, debt ratio is negatively related. R&D and size are positively related to the ratio of gross profit. Size has negative effect. Finally, current ratio is positively related to the index of financial performance.
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Wilkinson, Eleanor Louise. "More than the power of two: leading school improvement in Indigenous education." Thesis, 2019. https://researchonline.jcu.edu.au/62101/1/JCU_62101_Wilkinson_2019_thesis.pdf.
Full textAbstract:
Australian schools are now under constant pressure to improve their schools for students to have increased achievement and wellbeing outcomes, particularly for Aboriginal and Torres Strait Islander learners. This thesis has investigated the professional relationships of Indigenous Education Workers/Community Education Counsellors (IEWs/CECs) and principals and how they can lead together to improve their schools for Aboriginal and Torres Strait Islander students. Until now, their professional relationship has not been well understood or documented. This thesis captures the research that has sought to examine, interpret and transform the ambiguity of the professional relationship between IEW/CEC and principal. On another level, the study has aimed to highlight effective practice, inform future improvements for Indigenous education within the schools studied and for those in the greater region, and finally, provide a call for change of policy and practice within the wider school system of Queensland.
Informed by a plurality of paradigms, that of transformation and pragmatism and a tripartite of theory—critical theory, Indigenous standpoint theory and relationship leadership theory—this investigation was conducted across a large state educational region in Queensland. Using a mixed methods approach, quantitative and qualitative data were concurrently and sequentially collected over two phases in a four-year process. Each phase provided a collection of data that contributed to the separate and integrated, consecutive analysis of the core research questions. In Phase 1, 41 principals and 35 IEWs/CECs were surveyed for the broad analysis of the region's schools and contributed answers to the first core research question. In Phase 2, an instrumental case study was then undertaken in four schools with five exemplar IEW/CEC and principal pairs within the same region. The predominant methodological orientation for the case study was participatory and an adaption of critical participatory action research (CPAR) was conducted in three cycles over three years. Case study data were collected from a partnership assessment questionnaire, nine hours of responsive interviews, school documents and descriptive field notes from 13 site visits. This provided data for a holistic and detailed analysis of the IEW/CEC and principal professional relationship to answer all of the core research questions. Overall three rounds of data analysis occurred, multiple logics were employed together, with abduction, deduction and induction of descriptive statistics and thematic analysis of documentation.
Results of this study indicate while similar conditions were experienced by most schools across the region, the IEW/CEC and principal relationship was variable and fragmented for many and the role of IEW/CEC was underestimated and underutilised. The case study pairs presented differently and of the six relational dynamics evident between every pair, the most highly enacted was that of trusting interpersonal communication. Their strong relationships were created through certain personal predispositions and deliberate practices, but these occurred more by chance and less by systemic design. Strong relationships between IEW/CEC and principals showed they could mitigate detrimental contextual features like racism, perceived or actual uncertainty of funding and insufficiency of system support, while they ameliorated school members' capacity so leader agency, student success, parent engagement and staff cultural competency growth could occur. This study revealed that the IEW/CEC and principal relationship was not only microcosmic to school-community partnerships, but was also that of the greater project of national reconciliation.
This thesis provides implications that call for a change of policy and practice within the wider school system in the state of Queensland. It concludes that if educational outcomes for Indigenous students and engagement their families are to be maximised, professional relationships between IEWs/CECs and their principals need to exist and then expand beyond the pair through deliberate and greater systemic support. The position of IEW/CEC needs to be guaranteed in schools, training for Indigenist perspectives must be promulgated and systemic provision of resources for IEWs/CECs and principals in schools to grow their professional relationship must occur. A strong IEW/CEC and principal relationship can lead to less a transactional and different type of leader collaboration, one that creates a 'vorticity' of influence that enrols others into taking on the responsibility of supporting every Aboriginal and Torres Strait Islander student succeed, something that is more than the power of two.
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McCann, Julie McLaughlin. "White principals examine power, privilege, and identity : the challenge of leading for equity." Thesis, 2012. http://hdl.handle.net/1957/33669.
Full textAbstract:
The purpose of this qualitative study was to examine the experience of white principals in understanding their white identity, privilege, and power as they worked to implement socially-just and culturally proficient schools. The findings offer insights into the following questions: 1) How do white school leaders view white identity and the impact, if any, it has on their leadership? 2) How do white school leaders relate to students of color, their parents, and the community? 3) In what ways do white school leaders engage in race talk and address issues of white identity, privilege, and power? 4) What challenges do white school leaders experience as they attempt to end racism in their schools?
The study was set in a mostly white suburban school district in the Pacific Northwest. It involved three male and two female white principals who were previously engaged in equity training. Primary data sources included two individual interviews and two focus group sessions which were audiotaped and transcribed. Data analysis involved several coding cycles to identify themes related to the research questions. The analyses indicated the white principals engaged in a number of actions which demonstrated leadership focused on becoming culturally proficient.
The knowledge and understanding principals gained in the equity training contributed to their understanding of white privilege and white identity. Their ability to name this understanding while interacting with parents and students of color helped to build relationships and created allies in their work. Due to their perceived lack of
skill and knowledge related to implementing equity efforts around cultural competence, principals shared a hesitancy to lead staff into meaningful race talk and other work around white identity, privilege, and power. Challenges also arose as principals worked to manage competing district initiatives, limited staff training time, and the need for support.Graduation date: 2013
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Wu, Yun-Ling, and 吳韻玲. "Studies on the Predicting Power of Leading Indicator of Taiwan's Real Estate Cycle—Hidden Markov Model Analysis." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/81563878299509096219.
Full textAbstract:
碩士國立屏東商業技術學院
不動產經營系
97
Forecasting the trends of real estate cycle’s volatility and changes, it has been the most important issue in the area of macroeconomic analysis and decision making. In the past, most of study’s results showed that it did have the business cycle in real estate’s markets, and recur constantly. And once the events of business cycle fluctuations in real estate market occur, immediately it will be driven synchronous fluctuations of other industries. The impact of business cycle fluctuations in real estate market could be very important issues. Using the leading indicator composite index of Taiwan’s real estate cycle, this paper attempts to extend the Markov switching model to employ the discrete hidden Markov model for capturing the information of Markov switching model’s inner states set not directly-observed, and pre-detect the real estate cycle’s volatility. The empirical results show that HMM model can capture the asymmetry in duration of states. Compared with the real estate leading indicator announced by Taiwan Real Estate Research Center, HMM model has the same results on forecasting the trends of cycle fluctuations. On the other way, compared with Markov switching model, the explanatory power of HMM model in 4-steps out-of-sample forecasting is supported both conceptually and methodologically.
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Baxter, Kerry A. "Leading ladies : the power of passion : a study into women's career development in corporate organisations in the Australian financial services industry." Thesis, 2011. http://handle.uws.edu.au:8081/1959.7/506990.
Full textAbstract:
Women in executive positions in the Australian corporate organisation appear to be a novelty. There is however a small number of women, who, against the odds, do take up the challenge to lead and hold executive positions in corporate organisations. What can be learned from these women? This reflective inquiry begins by exploring an indicative and eclectic array of historical events, and critically reviews the pertinent literature, to see what significant influences have contributed to and shaped the overall emergence of women’s participation and taking of executive positions. The inquiry contributes by bringing together a diverse range of theoretical perspectives on women’s involvement in organisations with empirically rich examples, drawn from a Complexity informed qualitative interpretative project gathering women’s own stories, women who hold and have held executive positions within the financial services industry. My experiential reflection permeates and directs the overall approach as well as the way in which I made sense of and interpreted the inquiry. The result is the construction of a rich picture that informs current practice and experience while illuminating emergent implications for the broader corporate system. Focusing on the organisation and the factors that shape women’s career development I determine that institutional changes aimed at improving women’s representation in executive positions have not led to significant change and suggest that Complexity provides a new understanding that goes beyond the prevailing views of stereotypical and cultural barriers obstructing women’s career advancement. In the empirical work, I present a Complexity informed inquiry with Complexity providing the overarching logic, methodological approach, technique, and primary metaphors through which the findings are articulated and elaborated. Coherent conversations exploring how twelve women in executive positions make sense of and construct their every day experience in corporate organisations were used to generate narratives that were analysed and synthesised (through fractal and attractor analysis) to identify patterns of similarity. I have identified major themes and four attractor sets from which I make inference about what has guided and shaped these women’s behaviours and attitudes towards their corporate career and experience within the corporate organisation. The inquiry provides a new analysis represented by key themes, which are shown to have driven the actions of the women as they self-organised their corporate careers. Firstly, initial conditions influenced and shaped how these women constructed and thought about their career. Secondly, it was found that their career narratives were strongly entwined with other contexts (society, family and the personal domain). Thirdly, the findings indicate that as these women shift seamlessly from one role to another they constructed temporary identities (professional, mother, wife) as they followed their life cycle passions. Fourthly the career journeys of the women were shown to be non-linear and characterised as unpredictable and almost serendipitous as they changed course to make what I have termed ‘passion leaps’, at various times in their career. These leaps required risk-taking and foresight and an unbridled enthusiasm for an uncertain future and a not-so-certain landing. What emerged were women who were passionate about their positions and comfortable with leadership and taking executive positions: they just did it differently to men. I propose that the underrepresentation of women in leadership will only change when women’s difference is fully supported and the corporate career model changes in a way that supports a critical mass of women to take executive positions within the organisation.
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Zhai, Rui-Xiang, and 翟瑞祥. "Nonlinear Impacts of Demand Management Policy, Monopoly Power and Leverage Ratio on the U.S. Commercial Banks'' Operating Performance: The Role of Leading Indicator." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/253jh2.
Full textAbstract:
碩士中原大學
國際經營與貿易研究所
105
This paper employs the two-stage approach to evaluate the banks’ performance persistence, operational risk (core capital ratio, price cost margin) and the demand management policies (monetary policy, fiscal policy) to investigate the nonlinear uncertainty effect. In the first stage, the banks’ performance was evaluated by slack-based super efficiency model, which describes the operating characteristics of banks’ multiple input-outputs. The nonlinear effect was estimated by panel smooth transition regression model with the transition variable of the U.S. leading indicator. The empirical result shows four useful results when leading indicator (LI) is below the threshold (0.9593): Firstly, the banks will face the operating recession if they are trying to increase their monopoly power in the market. The recovery is ineffective, even though the LI is higher than the threshold. Secondly, maintaining the core capital ratio results in decline of operating performance, but the negative impact is gradually improved while the economy is picking up. Thirdly, decreasing the fund rate may help improve the banks'' performance. However, the contribution is diminished, inch by inch, as the LI exceed the threshold. Finally, the national debt leads to increasing the long-term interest rate, which may help improve banks’ efficiency; however, the contribution is ineffective when economic is warming up. The policy suggestions, in our research, are including: 1.Maintaining the competitive financial environment may help the banks to improve their operating efficiency. 2. Formulating the flexible leverage ratio, in the different business cycle stage, could reduce the negative effect on banks. 3. Ideating a solution to the banks’ dilemma such as the higher cost of outside financing while maintaining the leverage ratio during the depression. 4. When the economy is in rescission, the quantitative easing monetary (fiscal) policy lead to decreasing (increasing) the short (long) term interest, which may help improve the banks’ efficiency.
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Lee, Waltfred. "Influence of the sweep angle on the leading edge vortex and its relation to the power extraction performance of a fully-passive oscillating-plate hydrokinetic turbine prototype." Thesis, 2021. http://hdl.handle.net/1828/12749.
Full textAbstract:
Oscillating-foil hydrokinetic turbines have gained interest over the years to extract energy from renewable sources. The influence of the sweep angle on the performance of a fully-passive oscillating-plate hydrokinetic turbine prototype was investigated experimentally in the present work. The sweep angle was introduced to promote spanwise flow along the plate in order to manipulate the leading edge vortex (LEV) and hydrodynamically optimize the performance of the turbine.
In the present work, flat plates of two configurations were considered: a plate with a 6° sweep angle and an unswept plate (control), which were undergoing fully-passive pitch and heave motions in uniform inflow at the Reynolds numbers ranging from 15 000 to 30 000. The resulting kinematic parameters and the energy extraction performance were evaluated for both plates.
Planar (2D) particle image velocimetry (PIV) was used to obtain patterns of the phase-averaged out-of-plane vorticity during the oscillation cycle. The circulation in the wake was then related to the induced-forces on the plate by calculating the moments of vorticity of the LEV with respect to the pitching axis of the plate.
Tomographic (3D) PIV was implemented in evaluating the influence of the spanwise flow on the dynamics of the vortex structure in three-dimensional space. The rate of deformation of the vortex length was quantified by calculating the deformation terms embedded in the vorticity equations, then linked to the stability of the vortex.
The results show evidence of delay of the shedding of LEV and increased vortex stability, in the case of the swept plate. The manipulation of the LEV by the spanwise flow was related to the induced kinematics exhibited by the prolonged heave forces experienced by the swept plate, which led to the higher power extraction performance at high inflow velocities. In the presence of spanwise flow, positive vortex stretching along the vortex line increased the stabilization of the vortex core and prevented the onset of helical vortex breakdown, observed in the case of the unswept plate. The use of the sweep profile on the plate has led to the improvement of energy extraction performance of the fully-passive hydrokinetic turbine.Graduate
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Lee, Tung-Lin, and 李東霖. "A study of business model in leading advantage-the example of Infant/Children milk powder brand." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/kn396c.
Full textAbstract:
碩士銘傳大學
管理研究所碩士在職專班
97
This thesis was based on case study to probe into Infant & Children milk powder brand, this case has been leading the market leader for over 10 years, in recent two years, government dominates breast feeding among hospital may resulted in market size shrinking, more importance, internal compliance issue may impact by losing advantage at prenatal market, meanwhile, channel brands remain switching-out case company’s brand users, those factors may resulted in losing leading position, how case company readjust their strategies to maintain market leader position. This study found that it should be reformed their positioning by building company image toward corporate social responsibility, rebuilding professional image which case company’s background was pharmaceutical company & promoting rare metabolic products to improve recognition of potential user toward isolating mechanism, reducing switch-out impact toward channel conflict, those factors will be sustained case company to maintain market leader position. This study recommended that business model should be conducted by four strategies: provides highest value products, targets on premium users, rolls out value added efficacy, extensive word of mouth, and behind that there are several activities to support this strategy. The other finding is that each activity should not be only direct impact to key strategy, but also positive related to other activities, it is expecting to extend brand loyalty & expand word of mouth, beside, the proposition of the study will be performed an inimitable circumstance by positive circulation.
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Shih-HangSun and 孫士航. "Using the Game Theory to Form a Trading Strategy for Foreign Exchange Rate among Leading Economic Powers-Evidence from the FX Rate of Japanese Yen against US Dollar." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/73jacj.
Full textAbstract:
碩士國立成功大學
財務金融研究所碩士在職專班
104
After the World War II, the conflicts of countries have changed from the traditional military war to the currency wars. The wars are like a game between countries so we try to use the well-known Game Theory different from the traditional statement analysis and quantitative methods to predict the returns of the currency trade. By using the static prisoner's dilemma of the Nash Equilibrium and dynamic of the Backward Induction, we try to predict Dollar-Yen exchange rate trends. We also use the 52-Week High Momentum to determine the time of buying and use Stop And Reverse to determine the time of selling. Then we run the empirical study to check whether it can accurately produce predictable results and excellent return. The result of the empirical study through the static and dynamic game theory to analyze the US Monetary Policy shows that it is possible to predict the trend of the Yens against Dollars of foreign exchange. It enables us to have the portfolio before the appreciation or depreciation occurs.