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ARIENTI, VINICIUS LEAL. "PROBABILISTIC POWER FLOW: THEORY AND APPLICATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1990. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8479@1.
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOUm algoritmo de Fluxo de Potência Probabilístico (FPP) permite avaliar a probabilidade de ocorrência de certos eventos em um sistema de potência, baseado em seu desempenho passado, na previsão das demandas e nas disponibilidades das unidades geradoras e equipamentos de transmissão. Tais eventos são sobrecargas, sobre/subtensões e insuficiência de geração de potência ativa/reativa. As probabilidades ou riscos associados a tais eventos são medidas ou índices de adequação relacionando cargas, equipamentos disponíveis e a política operativa. Pode-se dizer que a formulação de FPP mais realista até hoje proposta possui duas restrições básicas. A primeira é a dificuldade de se obter simultaneamente e de forma eficiente, todos os índices de adequação. A segunda está relacionada com a precisão do algoritmo para as grandezas reativas, mesmo para níveis de incerteza não muito elevados. Neste trabalho, além de ser proposto um novo algoritmo de solução que resolve as restrições anteriormente citadas de forma bastante simples e eficaz, são demonstradas diversas aplicações dos algoritmos de FPP e também definidas metodologias de utilização desta ferramenta em estudos de planejamento da operação e da expansão, ressaltando-se ainda as similaridades com a análise de confiabilidade global de sistemas de potência. A aplicação dos métodos de FPP, obtendo informações adicionais para complementar a abordagem determinística convencional, tem demonstrado ser uma ferramenta auxiliar bastente útil no processo de tomada de decisão. As vantagens da inclusão deste algoritmo no rol de técnicas imprescindíveis aos engenheiros vem incentivando o uso desta abordagem de maneira mais ampla.
A Probabilistic Power Flow Algorithm (PPF) allows the practical evaluation of the probability of occurrence of power system events, based on their historical performance, load forecast and availability of generating units and transmission equipment. Such events are overlads, undervoltages, overvoltages and indufficiency of active/reactive power generation. The probabilities or risks associated to these events are adequacy measures, or indices, linking loads, available equipment and operational policies. The practical PPF formulations available in literature present two main drawbacks. The first one is related with the computational difficulty in simultaneously obtaining all basic adequacy indices, within an efficient computational scheme. The second is related with the accuracy of calculated reactive figures, even in the case of modest uncertainty levels. In this work, a new, simple and efficient PPF algorithm, which alleviates the previous drawbacks, is proposed. Several practical applications of the proposed PPF algorithm are described as well as methodologies for its use in operational and expansion planning. Also, the similarities between PPF and composite reliability evaluation algorithms are emphasized. The application of PPF methods, providing additional information to the conventional deterministic approaches, has shown to be a very important auxiliary tool in the decision making process, thus contributing for the broad use of probabilistic methods.
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Oo, Htet Htet Nwe. "Actuator Disk Theory for Compressible Flow." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1727.
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Because compressibility effects arise in real applications of propellers and turbines, the Actuator Disk Theory or Froude’s Momentum Theory was established for compressible, subsonic flow using the three laws of conservation and isentropic thermodynamics. The compressible Actuator Disk Theory was established for the unducted (bare) and ducted cases in which the disk was treated as the only assembly within the flow stream in the bare case and enclosed by a duct having a constant cross-sectional area equal to the disk area in the ducted case. The primary motivation of the current thesis was to predict the ideal performance of a small ram-air turbine (microRAT), operating at high subsonic Mach numbers, that would power an autonomous Boundary Layer Data System during test flights. The compressible-flow governing equations were applied to a propeller and a turbine for both the bare and ducted cases. The solutions to the resulting system of coupled, non-linear, algebraic equations were obtained using an iterative approach. The results showed that the power extraction efficiency and the total drag coefficient of the bare turbine are slightly higher for compressible flow than for incompressible flow. As the free-stream Mach increases, the Betz limit of the compressible bare turbine slightly increases from the incompressible value of 0.593 and occurs at a velocity ratio between the far downstream and the free-stream that is lower than the incompressible value of 0.333. From incompressible to a free-stream Mach number of 0.8, the Betz limit increases by 0.021 while its corresponding velocity ratio decreases by 0.036. The Betz limit and its corresponding velocity ratio for the ducted turbine are not affected by the free-stream Mach and are the same for both incompressible and compressible flow. The total drag coefficient of the ducted turbine is also the same regardless of the free-stream Mach number and the compressibility of the flow; but, the individual contributions of the turbine drag and the lip thrust to the total drag differs between compressible and incompressible flow and between varying free-stream Mach numbers. It was concluded that overall compressibility has little influence on the ideal performance of an actuator disk.
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Norton, Barry. "A theory for flow-oriented software processes." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527206.
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Horncastle, Edward T. "Core flow modelling : Constraints from dynamo theory." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502302.
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In recent history our understanding of the magnetic field and the generating motions of the molten iron in the Earths core have increased dramatically. The two major approaches to investigate fluid flow have been core surface flow modelling from magnetic data inversion and modelling of the dynamo itself. Core flow modelling involves downward continuation of the magnetic field to the core mantle boundary (CMB), then adopting the frozen flux approximation plus added assumptions e.g. tangential geostrophy to reduce non-uniqueness, to obtain fluid flow at the surface of the core that produces the observed secular variation (SV). The main check on the validity of these flows has been observed changes in length· of day. This study aims to test the fluid flow inversion more rigorously by using synthetic data of main field, SV and fluid flow from two self-consistent convection driven dipole dominated dynamos. The dynamo magnetic data are inverted and comparisons made with the true dynamo flow. The use of two large scale assumptions, the strong norm and the KE norm, has been tested. Forward models of advection, a neglected advection, and diffusion, from the dynamo data have been calculated to compare contributions to the secular variation. It is shown that within the dynamos the definition of the magnetic Reynolds number is flawed, relating to a failure of the frozen flux approximation. The effects of truncation of field and flow on the generated advection has been studied. It was found that both the failure of the frozen flux approximation and truncation had a large effect on the flow inversions. Another possible reason for non-recovery of some parts of the flow was found to be that much of the true and inverted flow was along contours of Br / cos 0, the null space caused by the geostrophic assumption. With reducing this non-uniqueness in mind, the validity of of a new assumption called helical flow was checked by studying the true properties of the dynamo flow. A new spectral helical flow constraint that can be applied separately to tangential geostrophy has been developed. With the caveat that the results have been found on dynamos with parameters very different to the Earth, cautious conclusions have been made on the best combinations of assumptions to use in Earth core flow models. It has been shown that, at the truncation of Earth models, when the new helical flow constraint is used with the KE norm and weak geostrophy more of the dynamo true flow has been recovered. The results have been applied to the Earth and validated by using changes in the length of day.
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Nebenfuhr, Laura. "Groups as a factor in flow theory." Honors in the Major Thesis, University of Central Florida, 1999. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/82.
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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.Bachelors
Arts and Sciences
Psychology
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Takagi, Naomi Igarashi. "Flow theory: Conscious experience in expository argumentative writing." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1238170540.
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Thesis (Ph.D.)--Case Western Reserve University, 2009Title from PDF (viewed on 30 July 2009) Department of English Includes abstract Includes bibliographical references Available online via the OhioLINK ETD Center
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Ravindran, S. S. "Uniqueness theory for compressible flows." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30276.
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This thesis investigates questions of uniqueness in the theory of Compressible flow. First, various uniqueness theorems for compressible flow are reviewed in an expository manner. Roughly, these theorems state that fluid motion in a bounded region Ω = Ω(t) is uniquely determined by its initial data together along with certain boundary conditions. Next, this analysis is extended to magnetohydrodynamic flows and uniqueness theorems are given for a variety of possible cases. The basic question in all these theorems is the determination of appropriate boundary conditions. The proofs are by energy estimates.Science, Faculty of
Mathematics, Department of
Graduate
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Gatti, Antonio. "A gauge invariant flow equation." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268629.
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Rawes, W. "The application of signal analysis techniques based on chaos theory to flow regime identification." Thesis, Cranfield University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245497.
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Clarke, D. S. "Problems in triple-deck boundary layer theory." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370406.
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O'Halloran, Colin. "Category theory and information flow applied to computer security." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358710.
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Johansson, Ida, and Andreas Goldmann. ""Verkligheten anropar!" : En kvalitativ studie om upplevelsen av flow och immersion för användare av Mutiplayer FPS-spel." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104818.
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Användarupplevelse anses vara en viktig aspekt inom dagens spel och utgör en betydande roll för framgång inom branschen. Flertal funktioner bör beaktas vid utvecklingen av optimal upplevelse och eftersom spelindustrin ständigt utvecklas måste även människans kunskap om komponenterna som skapar den optimala upplevelsen utvecklas. För avhandlingen undersöks flow och immersion som komponenter av optimal upplevelse i syfte att skapa förståelse för aktiviteters potential att inducera optimala spelupplevelser inom FPS-spel. Samtidigt undersöks möjligheten att kombinera flow och immersion inom en teori, för att uppnå bättre förståelse för deras relation till varandra inom en spelmiljö. Teorin som presenteras är flow theory, vilken staterar att specifika sinnestillstånd kan observeras när användare utför uppgifter som hen har olika kompetensnivåer inom och som motsätter sig olika utmaningsnivåer. Upplevelsen av flow faller inom de sinnestillstånd som kan observeras, medan immersion ej observeras. Dock överlappar immersion och flow inom flertal av de aspekter som möjliggör flows plats inom teorin, således finns möjlighet för immersion att potentiellt identifieras inom den. För att undersöka detta används både kvantitativa och kvalitativa metoder i form av enkätundersökningar och intervjuer med spelare av FPS-spel. Resultaten visar att ingen specifik aktivitet inom dessa spel kan identifieras med högre nivåer av vare sig flow eller immersion och ingen ytterligare forskning inom ämnet genomfördes. Resultaten påvisade att potentiell immersion kan uppstå inom flertal sinnestillstånd inom flowteorin, dock varierade nivåerna av potentiell immersion mellan dem. Vänners närvaro ökar potentialen att uppleva immersion.User experience is an important aspect of modern gameplay and plays an important role throughout the various parts that gaming has to offer. There are many features to regard in the development of the optimal gaming experience and as the industry continues to advance, our knowledge about the components of the optimal experience must advance with it. In this thesis flow and immersion as components of optimal user experience will be researched to gain an understanding for which activities within FPS-games show the most potential to induce these optimal gaming experiences. Whilst also attempting to combine them under one theory to achieve a better understanding of their relation to one another in a game setting. The theory presented is flow theory, which states that specific states of mind can be observed when users perform tasks in which they possess varying levels of competence and that oppose varying levels of challenge. The experience of flow is an observable state of mind within the theory, whilst immersion is not. However, immersion overlaps with multiple aspects of the flow experience that enables it to be part of this theory, thus enabling immersion's potential to be identified within it. To investigate this both quantitative and qualitative methods are used, consisting of surveys and interviews with gamers of FPS-style games. The results show that no specific activity within these games can be identified with higher levels of neither flow nor immersion and no further research on the subject was conducted. The results regarding immersion within the flow theory gave positive results. The potential to experience immersion was observed within multiple parts of the theory, even though the levels of potential immersion varied between the different areas. The results also showed that the presence of friends increased the potential to experience immersion.
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Jackson, George Andrew. "Multiple path ultrasonic flow measurement techniques : theory and practice." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232944.
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Schrank, Brian. "Play beyond flow: a theory of avant-garde videogames." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42865.
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Videogame tinkerers, players, and activists of the 21st century are continuing, yet redefining, the avant-garde art and literary movements of the 20th century. Videogames are diverging as a social, cultural, and digital medium. They are used as political instruments, artistic experiments, social catalysts, and personal means of expression. A diverse field of games and technocultural play, such as alternate reality games, griefer attacks, arcade sculptures, and so on, can be compared and contrasted to the avant-garde, such as contemporary tactical media, net art, video art, Fluxus, the Situationists, the work of Pollock or Brecht, Dada, or the Russian Formalists. For example, historical avant-garde painters played with perspectival space (and its traditions), rather than only within those grid-like spaces. This is similar in some ways to how game artists play with flow (and player expectations of it), rather than advancing flow as the popular and academic ideal. Videogames are not only an advanced product of technoculture, but are the space in which technoculture conventionalizes play. This makes them a fascinating site to unwork and rethink the protocols and rituals that rule technoculture. It is the audacity of imagining certain videogames as avant-garde (from the perspective of mainstream consumers and art academics alike) that makes them a good candidate for this critical experiment.
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Hull, Brian David. "Mathematical theory of flow processes of fibre-reinforced materials." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335766.
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Filippi, Margaux (Martin-Filippi). "Laboratory investigations of a chaotic flow using braid theory." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104282.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 95-98).
Describing transport in fluid flows has been a long-standing challenge in dynamical systems theory, with applications to industrial and natural flows. The detection of Lagrangian structures that stay coherent over time helps gain insight into the evolution of a system's dynamics and the fate of transport. Whereas most techniques to detect coherent structures rely on a dense velocity field, techniques based on sparse datasets are increasingly being developed. The braid theory approach to detect Lagrangian coherent structures from sparse sets of trajectories is tested through a periodic, two-dimensional Stokes flow, the rotor-oscillator flow. Combined theoretical and numerical studies have shown that this flow can offer chaotic regimes with islands of coherence. The flow was recreated experimentally in a laboratory based on the findings of these theoretical studies. The braid theory approach was found to successfully detect coherent groups from sparse trajectories, although it is very sensitive to the quality of that data available.
by Margaux Filippi.
S.M.
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Condon, Kieran. "Incorporating derivative order flow in foreign exchange microstructure theory." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5775.
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Includes abstract.Includes bibliographical references (p. 36-38).
This paper justifies the claim that orders on exchange rate derivatives, including forwards, swaps and options, have a place in exchange rate determination. A simple option model based on Kyle (1985) is presented illustrating that option order flow informs traders about expectations of future exchange rates. The model is placed in a complete market where options are replicable thus conveying the same information as spot orders. A proposal is made that forward order flow has a variable impact on spot rates, depending on the extent to which they are used in hedging activities and must be treated separately to spot orders. Finally, the construction of FX swap order flow could be achieved by considering only the spot leg of the swap transaction as the forward leg in a swap is necessarily a hedging tool with no effect on rates.
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徐善強 and Sin-keung Chui. "Stability and bifurcation in flow induced vibration." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31235724.
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Chui, Sin-keung. "Stability and bifurcation in flow induced vibration /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1904155X.
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Patil, Deepak C. "Particle Interactions in Industrial Granular Systems: Experiments, Theory, and Simulations." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/915.
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Granular media continue to be among the most manipulated materials found in various industries. Particle interactions in granular flow has fundamental importance in analyzing the performance of a wide range of key engineering applications such as hoppers, tumblers, and mixers etc. In spite of such ubiquitous presence, till date, our understanding of the granular flow is very limited. This restricts our ability to design efficient and optimal granular processing equipment. Additionally, the existing design abilities are also constrained by the number of particles to be analyzed, where, a typical industrial application involves millions of particles. This motivated the current research where investigations on the above limitations are pursued from three different angles: experimental, theoretical, and simulation. More specifically, this work aims to study particle-wall interaction and developing a computationally efficient cellular automata simulation framework for industrial granular applications. Towards this end, the current research is divided into two part: (I) energy dissipation during particle-wall interaction (II) cellular automata modeling. In part I, detailed experiments are performed on various sphere-thin plate combinations to measure the coefficient of restitution (COR) which is a measure of energy dissipation and it is one of the most important input parameters in any granular simulation. Alternatively, the energy dissipation measure also used to evaluate the elastic impact performance of superelastic Nitinol 60 material. Explicit finite element simulations are performed to gain detail understanding of the contact process and underlying parameters such as contact forces, stress-strain fields, and energy dissipation modes. A parametric study reveals a critical value of plate thickness above which the effect of plate thickness on the energy dissipation can be eliminated in the equipment design. It is found that the existing analytical expressions has limited applicability in predicting the above experimental and numerical results. Therefore, a new theoretical model for the coefficient of restitution is proposed which combines the effect of plastic deformation and plate thickness (i.e. flexural vibrations). In part II, in order to advance the existing granular flow modeling capabilities for the industry (dry and slurry flows) a cellular automata (CA) modeling framework is developed which can supplement the physically rigorous but computationally demanding discrete element method (DEM). These include a three-dimensional model which takes into account particle friction and spin during collision processing, which provides the ability to handle flows beyond solely the kinetic regime, and a multiphase framework which combines computational fluid dynamics (CFD) with CA to model multi-million particle count applications such as particle-laden flows and slurry flows.
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Melik, Serhat. "Cash Flow Analysis Of Construction Projects Using Fuzzy Set Theory." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612517/index.pdf.
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Construction industry is a one of the most risky sectors due to high level of uncertainties included in the nature of the construction projects. Although there are many reasons, the deficiency of cash is one of the main factors threatening the success of the construction projects and causing business failures. Therefore, an appropriate cash planning technique is necessary for adequate cost control and efficient cash management while considering the risks and uncertainties of the construction projects.
The main objective of this thesis is to develop a realistic, reliable and cost-schedule integrated cash flow modeling technique by using fuzzy set theory for including the uncertainties in project cost and schedule resulting from complex and ambiguous nature of construction works. The linguistic expressions are used for utilizing from human judgment and approximate reasoning ability of users for reflecting their experience into the model to create cash flow scenarios. The uncertain cost and duration estimates gathered from experts are inserted in the model as fuzzy numbers. The model provides the user different net cash flow scenarios with fuzzy formats that are beneficial for foreseeing possible cost and schedule threats to the project during the tender stage. The model is generated in Microsoft Excel 2007 using Visual Basic for applications and the model is applied to a case example.
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Hattori, Masanari. "Generalized slip-flow theory and its related Knudsen-layer analysis." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215508.
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The content of Chapter 1 is an author produced version of a paper published in Physics of Fluids. The final publication is available at AIP via http://dx.doi.org/10.1063/1.3691262. The content of Chapters 2 and 4 is an author produced version of papers published in Journal of Statistical Physics. The final publications are available at Springer via http://dx.doi.org/10.1007/s10955-012-0512-z and http://dx.doi.org/10.1007/s10955-015-1364-0, respectively.Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第19682号
工博第4137号
新制||工||1638(附属図書館)
32718
京都大学大学院工学研究科機械理工学専攻
(主査)教授 青木 一生, 教授 髙田 滋, 教授 稲室 隆二
学位規則第4条第1項該当
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Asprey, Steven Peter. "Theory and application of the temperature-scanning plug-flow reactor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq22442.pdf.
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Jack, David Abram. "Incorporation of directionally dependent diffusion with polymer composite flow theory." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4579.
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Thesis (M.S.) University of Missouri-Columbia, 2006.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 23, 2007) Includes bibliographical references.
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Dai, Rongqing. "Granular flow studies through kinetic theory and numerical simulation approaches." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41566.
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The investigations of three different topics of granular flows are reported in this thesis. (i) Second order solutions for granular simple shear flows are derived in the framework of granular kinetic theory. Compared to the first order solutions and the inconsistent second order solutions, the second order solutions of the present study provide better predictions of the numerical simulation results. (ii) Granular shear flows within narrow gaps and unbounded fields are studied by a molecular dynamics type discrete element simulation method. The effects of inelasticity and mean solids fraction on the distributions of granular temperatures, solids fractions and number densities of particle centers, and local mean velocities are examined. The slip velocities of bounded shear flows are calculated and the results are compared with the predictions of existing theories. (iii) Granular self-diffusion is investigated through both a kinetic theory and numerical simulation approaches by employing the time correlation function expression to determine the diffusion coefficient. The theoretical predictions agree very well with the simulation results for smooth particles at low concentrations, but at high concentrations the kinetic theory diffusion coefficients are lower than those determined in the computer simulations. The surface friction effect is examined numerically, and it is found that rough particles are less diffusive than smooth ones.
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Dodworth, Kieran. "The application of potential flow theory to damaged hull dynamics." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366890.
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Hufford, Gary S. (Gary Scott). "Viscous flow around marine propellers using boundary layer strip theory." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/42543.
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Karlsson, Cecilia. "Orienting Moduli Spaces of Flow Trees for Symplectic Field Theory." Doctoral thesis, Uppsala universitet, Algebra och geometri, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-269551.
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This thesis consists of three scientific papers dealing with invariants of Legendrian and Lagrangian submanifolds. Besides the scientific papers, the thesis contains an introduction to contact and symplectic geometry, and a brief outline of Symplectic field theory with focus on Legendrian contact homology. In Paper I we give an orientation scheme for moduli spaces of rigid flow trees in Legendrian contact homology. The flow trees can be seen as the adiabatic limit of sequences of punctured pseudo-holomorphic disks with boundary on the Lagrangian projection of the Legendrian. So to equip the trees with orientations corresponds to orienting the determinant line bundle of the dbar-operator over the space of Lagrangian boundary conditions on the punctured disk. We define an orientation of this line bundle and prove that it is well-defined in the limit. We also prove that the chosen orientation scheme gives rise to a combinatorial algorithm for computing the orientation of the trees, and we give an explicit description of this algorithm. In Paper II we study exact Lagrangian cobordisms with cylindrical Legendrian ends, induced by Legendrian isotopies. We prove that the combinatorially defined DGA-morphisms used to prove invariance of Legendrian contact homology for Legendrian knots over the integers can be derived analytically. This is proved using the orientation scheme from Paper I together with a count of abstractly perturbed flow trees of the Lagrangian cobordisms. In Paper III we prove a flexibility result for closed, immersed Lagrangian submanifolds in the standard symplectic plane.
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Rinehart, Morgan. "“The Flow of Blood in Nature” Franz Marc’s Animal Theory." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/578.
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This thesis argues for a coherent theory of the animal in the written and visual works of the German Expressionist painter, Franz Marc. By contextualizing Marc’s animal theory within the history of animal studies, this thesis will analyze how Marc’s animal theory corresponds with several central concepts within this field. One of these concepts—a theory of animal death—is central to the artist’s greater theory of the animal and to the analysis this thesis provides. In examining Marc’s theory of animal death, the following work will propose that the artist’s theory of animal spirituality is his greatest legacy within the field of animal theory.
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Molloy, Charles T. Whitham G. B. "Contributions to the kinetic theory of traffic flow with queuing /." Diss., Pasadena, Calif. : California Institute of Technology, 1985. http://resolver.caltech.edu/CaltechETD:etd-03262008-101545.
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Ehret, Susanne. "Energy-momentum tensor from Wilson flow in lattice φ4-theory." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28830.
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The energy-momentum tensor (EMT) is the Noether current associated with translations. It is of interest because, first of all, it has physical meaning as it contains the energy density and the momentum density. Moreover, its trace can be related to the beta function so that the scaling behaviour of the theory at hand can be studied. We are particularly interested in the scaling behaviour of strongly coupled theories. To explore the strong coupling regime it is necessary to compute the EMT non-perturbatively, i.e. on the lattice. This complicates matters greatly. On the lattice translation invariance is broken which leads to additional terms in the translation Ward identity from which the EMT is derived. This results in turn in the need to renormalise the EMT on the lattice. In this thesis we extend recent studies on the renormalisation of the EMT in four-dimensional gauge theory to the case of a three-dimensional scalar theory to investigate its divergence structure and the numerical feasibility of the suggested procedure on a more basic level. Furthermore, scalar φ4-theory in three dimensions exhibits an infrared fixed point and can thus serve as a toy model to examine mechanisms for building theories beyond the standard model. Our strategy to renormalise the EMT on the lattice is to identify all possible terms that can mix with both sides of the translation Ward identity. The renormalised EMT is a combination of operators of the same or lower dimension obeying the symmetries of the theory. The mixing is determined by requiring that the renormalised EMT satisfies the correct Ward identities. Using different probes in the translation Ward identity one can compute the coefficients of the EMT by solving a linear system of equations. However, contact terms can arise. One solution is the recently introduced Wilson flow. Its renormalisation properties allow for expectation values free of contact terms. That way the Wilson flow provides for a meaningful theoretical formulation of the EMT on the lattice that can be used in practice. In this thesis we review the renormalisation properties and the phase diagram of scalar φ4-theory in three dimensions, the translation Ward identity and the EMT in the continuum, as well as the gradient flow for scalar theory. A large part is dedicated to the perturbative renormalisation of the EMT on the lattice. Finally, our strategy to compute the renormalisation constants of the EMT in scalar theory non-perturbatively is discussed in detail, and our results for the renormalisation constants are presented.
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Efremov, Alexander. "Renormalization of SU(2) Yang-Mills theory with flow equations." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX050/document.
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L'objectif de ce travail est une construction perturbative rigoureuse de la théorie de la Yang-Mills SU(2) dans l'espace euclidien à quatre dimensions. La technique d'intégration fonctionnelle donne une basemathématique pour établir les équations de flot différentielles du groupe de renormalisation pour l'action efficace. Si l'introduction de régulateurs dans l'espace de moments permet de donner une définition mathématique des fonctions de Schwinger, la difficulté importante de l'approche est le fait que cesrégulateurs brisent l'invariance de jauge. Ainsi, le travail principal est alors de prouver à tous les ordres en perturbation l'existence de ces fonctions de correlation et la validité des identités de Slavnov-Taylor pour la théorie renormaliséeThe goal of this work is a rigorous perturbative construction of the SU(2) Yang-Mills theory in four dimensional Euclidean space. The functional integration technique gives a mathematical basis for establishing the differential Flow Equations of the renormalization group for the effective action. While the introduction of momentum space regulators permits to give a mathematical definition of the Schwinger functions, the important difficulty of the approach is the fact that these regulators break gauge invariance. Thus the main part of the work is to prove at all loop orders the existence of the vertex functions and the restoration of the Slavnov-Taylor identities in the renormalised theory
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Hunt, Thomas A. "Theory and simulation of polymer liquids under extensional and shear flows." Swinburne Research Bank Swinburne Research Bank, 2008. http://hdl.handle.net.
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Thesis (PhD) - Swinburne University of Technology, Centre for Molecular Simulation - 2008.Submitted in fulfilment of requirements for the degree Doctor of Philosophy, Centre for Molecular Simulation, Faculty of Information and Communication Technologies, Swinburne University of Technology, 2008. Typescript. Bibliography: p. 206-226.
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Fearn, R. M. "Fundamental flow phenomena in a sudden symmetric expansion." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235187.
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Ben, Dhia Zakaria. "Novel Treatments for Multi-phase Flow Prediction Inspired By Kinetic Theory." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34924.
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This study entails an investigation of a novel moment closure, originally constructed for rarefied-gas prediction, to the modelling of inert, dilute, disperse, particle flows. Such flows are important in many engineering situations. As one example, in internal-combustion engines, fuel is often injected as a spray of tiny droplets and, during combustion, a cloud of tiny soot particles can be formed. These particle phases are often difficult to model, especially when particles display a range of velocities at each location in space. Lagrangian methods are often too costly and many Eulerian field-based methods suffer from model deficiencies and mathematical artifacts. Often, Eulerian formulations assume that all particles at a location and time have the same velocity. This assumption leads to nonphysical
results, including an inability to predict particle paths crossing and a limited number of boundary conditions that can be applied.
The typical multi-phase situation of many particles is, in many ways, similar to that
of a gas compressed of a huge number of atoms or molecules. It is therefore expected that powerful techniques from the kinetic theory of gases could be applied. This work explores the advantages of using a modern fourteen-moment model, originally derived for rarefied gases, to predict multi-phase flows. Details regarding the derivation, the mathematical structure, and physical behaviour of the resulting model are explained. Finally, a numerical implementation is presented and results for several flow problems that are designed to demonstrate the fundamental behaviour of the models are presented. Comparisons are made with other classical models.
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Aljohani, Abdulrahman. "Applications of triple deck theory to study the flow over localised heating elements in boundary layers." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/applications-of-triple-deck-theory-to-study-the-flow-over-localised-heating-elements-in-boundary-layers(a3174ce1-f4db-47d8-b0a7-a712461a8211).html.
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In this thesis, we investigate flow past an array of micro-electro-mechanical-type (MEMS-type) heating elements placed on a flat surface, where MEMS devices have hump-shaped surfaces, using the triple deck theory. In this work we start by investigating the problem with a single heating element. MEMS devices can be used to control the fluid dynamics over the surface. Hence, we present a review of the boundary layer and the triple deck theories, followed by a literature review of the problem of flow past an array of MEMS devices. Next, we formulate our problem with the aid of the method of matched expansions for supersonic and subsonic flows. Thirdly, we solve analytically the linear version of the problem for supersonic flows. Thereafter, the non-linear problem is solved numerically where a detailed description of a hybrid method to solve the formulated non-linear problem for supersonic flow is exhibited. Fourthly, for subsonic flows we continue investigating flow past a heating element placed on a flat surface. Linear analysis of this problem is conducted. A novel numerical method to solve the non-linear problem for subsonic flows is described. The results are then discussed. In a similar context, we formulate a problem which can be considered as an the extension of previous subsonic flow problem to the three dimensional case. Analytical results are obtained using the Fourier transform where the linear approximation of the problem is considered and numerical results are then obtained using the Fast Fourier Transform. Finally, we consider a case of transonic flow past a heating element placed on a flat surface, where MEMS device has a hump-shaped surface. This transonic flow problem is non-linear in the upper deck and the lower deck equations where they should be solved simultaneously. Hence, a numerical method is required where we will use a finite difference method in stream-wise direction and Chebyshev collocation method in the wall normal direction. The results are then analysed. In conclusion, the use of localised heating elements in boundary layers for flow types considered in the thesis can contribute to the possibility of favourably controlling the fluid flow perturbations.
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Zambelli, Luca <1984>. "On the renormalization flow representation of field theory and some applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5199/.
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In this thesis we discuss a representation of quantum mechanics and quantum and statistical field theory based on a functional renormalization flow equation for the one-particle-irreducible average effective action, and we employ it to get information on some specific systems.
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Cardao-Pito, Tiago. "Intangible flow theory, operating intangibility and other economic characteristics of firms." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18245.
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Intangible flow theory explains that flows of economic material elements, such as cash or physical goods, are consummated by embedded human related intangible flows, such as services flows, work flows, information flows, knowledge flows or communicational flows, which have properties precluding them to be considered assets or capital. Therefore, mathematical/quantitative research methods are necessary but insufficient to study economy and society. The theory uses the precision approach to capture tangibility (and its opposite), which enables defining cash flows occurred in an identifiable period as tangible flows. To demonstrate intangible flow dynamics, the thesis suggests that corporations may partially organize themselves according to operating needs associated with the tangibility of product (output) flows used to generate material cash flows through sales to customers. For example, firms producing cars or planes might be required to have distinct economic characteristics to fi rms selling pure services or software. The thesis reviews interdisciplinary literature about products and their characteristics, and introduces the concept of operating intangibility based upon intangible flow theory. This concept assists the problem of classifying corporations according to their product flows' intangibility. For approximately identifying a firm's level of operating intangibility, the methodological framework looks into the absence of its opposite, which can be identified with a certain degree of precision through the accounting proportion that costs of physical goods sold and depreciations of tangible property, equipment and facilities have in total operating expenses. The empirical findings exhibit that a firm's operating intangibility tends to be reflected in several other economic characteristics: size, investment profile, profitability, market valuation, or capital structure. Furthermore, the results show that the level of operating intangibility framework exempts us from the need of assuming that firms registered in the same industry are either homogeneous or sell homogeneous products, because it can be used to classify firms within an industry, or industries themselves. The empirical analysis was conducted on a very large international sample of listed firms containing 15 country sub-samples from Australia, Canada, China, France, Germany, Israel, Japan, Malaysia, Singapore, South Africa, South Korea, Sweden, Taiwan, USA, and UK.
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Fredriksson, Desirée. "Incorporating aspects of flow theory to design an achievement-oriented interface." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231309.
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The aim of this study was to explore how flow theory could be applied to improve the process for completing an application process to a creative education program. This was done by first formulating an approach inspired by flow theory and characteristics that promotes creativity in digital tools. The question was then explored using research through design with the goal of formulating the aspects of the flow theory inspired approach as generative intermediate level knowledge in the form of guidelines. User centered design was applied during the design process, starting with an empathizing phase where fundamental information about the application process and the users was attained. It went on to explore design implementations based on the flow theory inspired approach during a workshop and then on to creating an interactive prototype which was evaluated by six participants, iterated and tested in a second user evaluation. The findings of the study implicate that incorporating the guidelines in the flow theory inspired approach could be helpful when designing supportive achievement-oriented environments.Syftet med studien var att undersöka hur flow teorin kan implementeras i syfte att förbättra ansökningsprocessen till ett kreativt utbildningsprogram. Detta undersöktes genom att först formulera ett antal riktlinjer inspirerade av aspekter ur flow teorin samt faktorer som främjar kreativitet i digitala verktyg. Forskningsfrågan utvärderades genom en användarcentrerad designprocess, processen började med att förstå användarnas upplevelse och skolans mål med ansökningsprocessen. Under en workshop undersöktes det hur de framtagna riktlinjerna kunde appliceras i ett gränssnitt. Efter denna workshop påbörjades arbetet med att generera en prototyp som sedan utvärderades i ett användartest, itererades och utvärderades i ett andra användartest. Målet med designprocessen var att undersöka huruvida riktlinjerna som formulerats hade potential att användas som generella riktlinjer vid gränssnittsdesign. Resultaten från studien tyder på att riktlinjerna som formulerades har potential att skapa bättre, mer stöttande, upplevelser i prestationsinriktade miljöer.
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Law, Yan Tai. "Pricing under random information flow and the theory of information pricing." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9292.
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This thesis presents a mathematical formulation of informational inhomogeneity in financial markets, with emphasis on its impact on asset volatility, the notion of information extraction, and the role of information providers. We begin with a brief review of the BHM framework, which models the market filtration by an information process consisting of a signal and a noise term, such that the signal-to-noise ratio is determined by the information flow rate. Motivated by the observations that valuable information is rarely circulated homogeneously across financial markets, and that the information flow rate is typically random, we introduce, in the first part of the thesis, an extension of the BHM approach that leads to the simplest class of stochastic volatility models. In this extended framework we derive closed form expressions: for (a) asset price processes; (b) pricing formulae for options; and (c) option deltas. We show that the model can be calibrated to fit volatility surfaces reasonably well, and that it can be used effectively to model information manipulation. In the second part we introduce a framework for the valuation of information. In particular, a new formulation of the utility-indifference argument is introduced and used as a basis for pricing. We regard information as a quantity that converts a prior distributions into a posterior distributions. The amount of information can thus be quantified by relative entropy. The key to our theory is to equate the maximised a posterior utility with the a posterior expectation of the utility of the a priori optimal strategy. This formulation leads to one price for a given quantity of upside, and another for a given quantity of downside information. Various intuitive, as well as counterintuitive implications (for example, price of information is not necessarily an increasing function of the volume of information) of our theory are discussed in detail.
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Nam, Do H. "Methodologies for integrating traffic flow theory, ITS and evolving surveillance technologies." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-165829/.
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Grenda, Donn Robert. "A General Theory of Economic Flow, Social Exchange, and Hegemonic Relationship." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539625722.
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O'Connell, Gregory Raymond. "Detector cell hydrodynamics and electrode selectivity in flow-injection potentiometry." Thesis, Brunel University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290935.
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Wagner, Alexander. "Theory and applications of the lattice Boltzmann method." Thesis, University of Oxford, 1997. http://ora.ox.ac.uk/objects/uuid:882b9026-22cd-4e77-95e5-aca62f93df11.
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Yao, Yifei. "Exploring the sense of immersion of MMORPG game design." Thesis, Södertörns högskola, Institutionen för kommunikation, medier och it, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-7508.
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MMORPG game as the a representative product of video game from its birth to the present more than several decades, have been developing at an astonishing speed and MMORPG player groups have expanded. Nevertheless, there are questions being raised of the relatively new and successful field of sense of immersion of MMORPG game design. In the previous studies, the theory of flow had been testified to be the tremendously significant to explore sense of immersion while performing the activities and it had been applied to many different domains. Based on three conditions of that are necessary to achieve the flow state, the paper addresses the predicaments by analyzing the research results in relation to previous design report on the sense of immersion of MMORPG game design. The paper also provides the constrictive thoughts and productive sketches on how to promote the sense of immersion of MMORPG game using the design artifacts in an early design process.
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Zhou, Xinwei. "Reachability relations in selective regression testing." Thesis, London South Bank University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265281.
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Lun, Cliff Ki Keung. "Kinetic theories of granular flow." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73989.
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Oelerich, Jerry J. "Open-channel capillary flow in micro-scale helical support structures." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Spring2009/J_Oelerich_042709.pdf.
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Thesis (M.S. in chemical engineering)--Washington State University, May 2009.Title from PDF title page (viewed on June 8, 2009). "Department of Chemical Engineering." Includes bibliographical references (p. 70-71).
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莫崧鷹 and Songying Mo. "Theory and application of pulse voltammetric techniques for electroanalysis in steady flow systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31235207.
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Mo, Songying. "Theory and application of pulse voltammetric techniques for electroanalysis in steady flow systems /." Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17592264.
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