Dissertations / Theses on the topic 'Systems and components (SSCs)'
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1
Yoon, Yong-Kyu. "Micromachined Components for RF Systems." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5264.
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Several fabrication techniques for surface micromachined 3-D structures have been developed for RF components. The fabrication techniques all have in common the use of epoxy patterning and subsequent metallization. Techniques and structures such as embedded conductors, epoxy-core conductors, a reverse-side exposure technique, a multi-exposure scheme, and inclined patterning are presented. The epoxy-core conductor technique makes it easy to fabricate high-aspect-ratio (10-20:1), tall (~1mm) RF subelements as well as potentially very complex structures by taking advantage of advanced epoxy processes. To demonstrate feasibility and usefulness of the developed fabrication techniques for RF applications, two test vehicles are employed. One is a solenoid type RF inductor, and the other is a millimeter wave radiating structure such as a W-band quarter-wavelength monopole antenna. The embedded inductor approach provides mechanical robustness and package compatibility as well as good electrical performance. An inductor with a peak Q-factor of 21 and an inductance of 2.6nH at 4.5GHz has been fabricated on a silicon substrate. In addition, successful integration with a CMOS power amplifier has been demonstrated. A high-aspect-ratio inductor fabricated using epoxy core conductors shows a maximum Q-factor of 84 and an inductance of 1.17nH at 2.6GHz on a glass substrate with a height of 900um and a single turn. Successful W-band monopole antenna fabrication is demonstrated. A monopole with a height of 800um shows its radiating resonance at 85GHz with a return loss of 16dB.
In addition to the epoxy-based devices, an advanced tunable ferroelectric device architecture is introduced. This architecture enables a low-loss conductor device; a reduced intermodulation distortion (IMD) device; and a compact tunable LC module. A single-finger capacitor having a low-loss conductor with an electrode gap of 1.2um and an electrode thickness of 2.2um has been fabricated using a reverse-side exposure technique, showing a tunability of 33% at 10V. It shows an improved Q-factor of 21.5. Reduced IMD capacitors consist of wide RF gaps and narrowly spaced high resistivity electrodes with a gap of 2um and a width of 2um within the wide gap. A 14um gap and a 20um gap capacitor show improved IMD performance compared to a 4um gap capacitor by 6dB and 15dB, respectively, while the tunability is approximately 21% at 30V for all three devices due to the narrowly spaced multi-pair high resistivity DC electrodes within the gap. Finally, a compact tunable LC module is implemented by forming the narrow gap capacitor in an inductor shape. The resonance frequency of this device is variable as a function of DC bias and a frequency tunability of 1.1%/V is achieved. The RF components developed in this thesis illustrate the usefulness of the application of micromachining technology to this application area, especially as frequencies of operation of RF systems continue to increase (and therefore wavelengths continue to shrink).
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Motta, Enrico. "Reusable components for knowledge modelling." N.p, 1997. http://ethos.bl.uk/.
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Bouvier, Quentin. "Encapsulation of reactive components in polyurethane systems." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/673183.
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Actualment els poliuretans s'utilitzen àmpliament en la indústria de recobriments i adhesius. Existeixen moltes tecnologies diferents per aplicar recobriments i adhesius sobre
substrats i les tecnologies en les quals es pot controlar la reticulació o l'adhesió són de gran interès. De fet, això oferiria noves possibilitats per a sistemes complexos de
recobriment/adhesiu. Amb aquesta finalitat, ja s'han desenvolupat reactius especials anomenats poliisocianats bloquejats; són derivats d'isocianats que només es poden activar
mitjançant activador tèrmic. En un enfocament similar, l'encapsulació i l'alliberament controlat de components de formulació de poliuretà oferirà noves perspectives cap a
tecnologies millorades. En primer lloc, en la present tesis, la encapsulació de catalitzadors basats en metalls en nanocàpsules de policaprolactona s'ha realitzat amb èxit
mitjançant els mètodes de difusió de dissolvents d'emulsió i nanoprecipitació. S'ha obtingut una eficiència d'encapsulació millorada quan les nanocàpsules es carreguen amb
una barreja de catalitzador i trioctanoat de gliceril, així com quan les nanocàpsules es sintetitzen amb superfícies exteriors carregades. La implementació d'aquestes
nanocàpsules en recobriments de poliuretà demostra que són adequades per a la preparació de recobriments termosensibles. En segon lloc, s'ha aconseguit amb èxit
l'encapsulació de poliisocianats, ja sigui en microcàpsules de poliuretà per policondensació interfacial, o en nanocàpsules de policaprolactona per nanoprecipitació. El procés
d'encapsulació i l'estabilitat a llarg termini de les microcàpsules s'ha millorat molt treballant les propietats de l'embolcall de poliurea, però, les microcàpsules encara romanen
fràgils amb el pas del temps i no es podrien utilitzar industrialment. La nanoencapsulació de poliisocianats ha mostrat que la reacció secundaria isocianat-aigua és
especialment difícil d'evitar i suggereix que s'hauria d'investigar la tècnica d'encapsulació sense aigua, com ara la congelació d'esprai.Actualmente los poliuretanos se utilizan ampliamente en la industria de recubrimientos y adhesivos. Existen muchas tecnologías distintas para aplicar recubrimientos y adhesivos sobre sustratos y las tecnologías en las que se puede controlar la reticulación o la adhesión son de gran interés. De hecho, esto ofrecería nuevas posibilidades para sistemas complejos de recubrimiento/adhesivo. A tal fin, ya se han desarrollado reactivos especiales llamados poliisocianatos bloqueados; son derivados de isocianatos que sólo pueden activarse mediante activador térmico. En un enfoque similar, la encapsulación y liberación controlada de componentes de formulación de poliuretano ofrecerá nuevas perspectivas hacia tecnologías mejoradas. En primer lugar, en la presente tesis, la encapsulación de catalizadores basados en metales en nanocápsulas de policaprolactona se ha realizado con éxito mediante los métodos de difusión de disolventes de emulsión y nanoprecipitación. Se ha obtenido una eficiencia de encapsulación mejorada cuando las nanocápsulas se cargan con una mezcla de catalizador y trioctanoato de glicerilo, así como cuando las nanocápsulas se sintetizan con superficies exteriores cargadas. La implementación de estas nanocápsulas en recubrimientos de poliuretano ha demostrado que son adecuadas para la preparación de recubrimientos termosensibles. En segundo lugar, se ha logrado con éxito la encapsulación de poliisocianatos, ya sea en microcápsulas de poliuretano por policondensación interfacial, o en nanocápsulas de policaprolactona por nanoprecipitación. El proceso de encapsulación y la estabilidad a largo plazo de las microcápsulas se ha mejorado mucho trabajando las propiedades de la envoltura de poliurea, sin embargo, las microcápsulas todavía permanecen frágiles con el paso del tiempo y no se podrían utilizar industrialmente. La nanoencapsulación de poliisocianatos ha mostrado que la reacción secundaria isocianato-agua es especialmente difícil de evitar y sugiere que debería investigarse la técnica de encapsulación sin agua, como la congelación de spray.
Nowadays polyurethanes are widely used in the coating and adhesive industry. Many different technologies exist to apply coatings and adhesives on substrates and technologies in which crosslinking or adhesion could be controlled are of greatest interest. Indeed, this would offer new possibilities for complex coating/adhesive systems. For this purpose, special reagents called blocked polyisocyanates have already been developed; they are derivatives of isocyanates which can only be activated via thermal trigger. In a similar approach, the encapsulation and controlled release of polyurethane formulation components would offer new perspectives toward enhanced technologies. First, the nanoencapsulation of metal-based catalysts into polycaprolactone nanocapsules was successfully performed by emulsion-solvent diffusion and nanoprecipitation. Improved encapsulation efficiency was obtained when the nanocapsules were loaded with a mixture of the catalyst and glyceryl trioctanoate, as well as when the nanocapsules were synthesized with charged outer surfaces. Implementation of these nanocapsules into polyurethane coatings showed that they are suitable for the preparation of thermoresponsive coatings. Then, the encapsulation of polyisocyanates was successfully achieved, either in polyurea microcapsules by interfacial polycondensation, or in polycaprolactone nanocapsules by nanoprecipitation. The encapsulation process and the long-term stability of the microcapsules was greatly improved by working on the polyurea shell properties, however, the microcapsules still remain fragile over time and could not be used industrially. The nanoencapsulation of polyisocyanates showed the isocyanate-water side-reaction is particularly challenging to avoid and it suggested that water-free encapsulation technique, such as spray congealing, should be investigated.
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Middendorf, John Raymond. "Novel Devices and Components for THz Systems." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1400252710.
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Milovanovic, Ivan. "Components for area-efficient stormwater treatment systems." Licentiate thesis, Luleå tekniska universitet, Arkitektur och vatten, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83877.
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Golish, Dathon R. "Quasioptical Systems & Components for Terahertz Astronomy." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195891.
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Over the past two decades, submillimeter and terahertz astronomy has grown rapidly and become an important new window for studying the universe. This growth has been enabled by the confluence of several technologies which make the design and fabrication of high frequency single and multi-pixel heterodyne receivers possible. This dissertation reviews the development of a new generation of terahertz instrumentation at the University of Arizona, with specific emphasis on their optical components and systems. These instruments include several receivers for the Antarctic Submillimeter Telescope and Remote Observatory (formerly installed at the South Pole), including a dual-frequency 492/810 GHz receiver called Wanda, a 4-pixel 810 GHz heterodyne array called PoleSTAR, and a 1.5 THz receiver called TREND. It also covers receivers for the Heinrich Hertz Submillimeter Telescope on Mt. Graham in southern Arizona. These receivers include a 7-pixel 345 GHz heterodyne array called DesertSTAR, a 64-pixel polarimeter/bolometer system called Hertz, and a 64-pixel 345 GHz heterodyne array called SuperCam. After reviewing these instruments, concepts for the next generation of arrays and terahertz telescopes designed for the high Atacama desert, Antarctica, high altitude balloon missions, and orbiting observatories will be presented. This dissertation will also cover other contributions made to terahertz astronomy, including the creation of a Gaussian beam propagation program to help design terahertz optical systems and an integrated optics design for a waveguide interferometer to be used as an alternative to traditional bulk optics systems.
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Martins, Helder Ricardo Laximi. "Distributed replicated macro-components." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10766.
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Dissertação para obtenção do Grau de Mestre em
Engenharia InformáticaIn recent years, several approaches have been proposed for improving application performance on multi-core machines. However, exploring the power of multi-core processors remains complex for most programmers. A Macro-component is an abstraction that tries to tackle this problem by allowing to explore the power of multi-core machines without requiring changes in the programs. A Macro-component encapsulates several diverse implementations of the same specification. This allows to take the best performance of all operations and/or distribute load among replicas, while keeping contention and synchronization overhead to the minimum. In real-world applications, relying on only one server to provide a service leads to limited fault-tolerance and scalability. To address this problem, it is common to replicate services in multiple machines. This work addresses the problem os supporting such replication solution, while exploring the power of multi-core machines. To this end, we propose to support the replication of Macro-components in a cluster of machines. In this dissertation we present the design of a middleware solution for achieving such goal. Using the implemented replication middleware we have successfully deployed a replicated Macro-component of in-memory databases which are known to have scalability problems in multi-core machines. The proposed solution combines multi-master replication across nodes with primary-secondary replication within a node, where several instances of the database are running on a single machine. This approach deals with the lack of scalability of databases on multi-core systems while minimizing communication costs that ultimately results in an overall improvement of the services. Results show that the proposed solution is able to scale as the number of nodes and clients increases. It also shows that the solution is able to take advantage of multi-core architectures.
RepComp project (PTDC/EIAEIA/108963/2008)
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Wang, Kerwin. "Micro-optical components for a MEMS integrated display /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/6047.
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Stevens, Gary. "Fibre components and systems for mid-IR applications." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/7290/.
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Fibre-optic components and systems are used in a wide variety of industrial, medical and communication applications and can be found in use everywhere in the modern world, from the bottom of the ocean to satellites in orbit. The field of fibre optics has seen rapid growth in the past few decades to become an essential enabling technology. However, much more work is needed to develop components and systems that can work at wavelengths in the short-wavelength infrared (SWIR)/mid-IR part of the spectrum (defined in this work as 1.5 – 4.5).
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Dardha, Ornela <1985>. "Type Systems for Distributed Programs: Components and Sessions." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6441/.
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Modern software systems, in particular distributed ones, are everywhere around us and are at the basis of our everyday activities. Hence, guaranteeing their cor- rectness, consistency and safety is of paramount importance. Their complexity makes the verification of such properties a very challenging task. It is natural to expect that these systems are reliable and above all usable.
i) In order to be reliable, compositional models of software systems need to account for consistent dynamic reconfiguration, i.e., changing at runtime the communication patterns of a program.
ii) In order to be useful, compositional models of software systems need to account for interaction, which can be seen as communication patterns among components which collaborate together to achieve a common task.
The aim of the Ph.D. was to develop powerful techniques based on formal methods for the verification of correctness, consistency and safety properties related to dynamic reconfiguration and communication in complex distributed systems. In particular, static analysis techniques based on types and type systems appeared to be an adequate methodology, considering their success in guaranteeing not only basic safety properties, but also more sophisticated ones like, deadlock or livelock freedom in a concurrent setting.
The main contributions of this dissertation are twofold.
i) On the components side: we design types and a type system for a concurrent object-oriented calculus to statically ensure consistency of dynamic reconfigurations related to modifications of communication patterns in a program during execution time.
ii) On the communication side: we study advanced safety properties related to communication in complex distributed systems like deadlock-freedom, livelock- freedom and progress.
Most importantly, we exploit an encoding of types and terms of a typical distributed language, session π-calculus, into the standard typed π- calculus, in order to understand their expressive power.
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Mazur, Tomasz Krzysztof. "Model Checking Systems with Replicated Components using CSP." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:6694fac7-00b4-4b25-b054-813d7a6a4cdb.
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The Parameterised Model Checking Problem asks whether an implementation Impl(t) satisfies a specification Spec(t) for all instantiations of parameter t. In general, t can determine numerous entities: the number of processes used in a network, the type of data, the capacities of buffers, etc. The main theme of this thesis is automation of uniform verification of a subclass of PMCP with the parameter of the first kind, using techniques based on counter abstraction. Counter abstraction works by counting how many, rather than which, node processes are in a given state: for nodes with k local states, an abstract state (c(1), ..., c(k)) models a global state where c(i) processes are in the i-th state. We then use a threshold function z to cap the values of each counter. If for some i, counter c(i) reaches its threshold, z(i) , then this is interpreted as there being z(i) or more nodes in the i-th state. The addition of thresholds makes abstract models independent of the instantiation of the parameter. We adapt standard counter abstraction techniques to concurrent reactive systems modelled using the CSP process algebra. We demonstrate how to produce abstract models of systems that do not use node identifiers (i.e. where all nodes are indistinguishable). Every such abstraction is, by construction, refined by all instantiations of the implementation. If the abstract model satisfies the specification, then a positive answer to the particular uniform verification problem can be deduced. We show that by adding node identifiers we make the uniform verification problem undecidable. We demonstrate a sound abstraction method that extends standard counter abstraction techniques to systems that make full use of node identifiers (in specifications and implementations). However, on its own, the method is not enough to give the answer to verification problems for all parameter instantiations. This issue has led us to the development of a type reduction theory, which, for a given verification problem, establishes a function phi that maps all (sufficiently large) instantiations T of the parameter to some fixed type T and allows us to deduce that if Spec(T) is refined by phi(Impl(T)), then Spec(T) is refined by Impl(T). We can then combine this with our extended counter abstraction techniques and conclude that if the abstract model satisfies Spec(T), then the answer to the uniform verification problem is positive. We develop a symbolic operational semantics for CSP processes that satisfy certain normality requirements and we provide a set of translation rules that allow us to concretise symbolic transition graphs. The type reduction theory relies heavily on these results. One of the main advantages of our symbolic operational semantics and the type reduction theory is their generality, which makes them applicable in other settings and allows the theory to be combined with abstraction methods other than those used in this thesis. Finally, we present TomCAT, a tool that automates the construction of counter abstraction models and we demonstrate how our results apply in practice.
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Houzouris, Adrienne. "The availability of multifunctional systems with multistate components." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07212009-040313/.
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Jungwirth, Matthew Edward Lewis. "Active Reflective Components for Adaptive Optical Zoom Systems." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/255163.
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This dissertation presents the theoretical and experimental exploration of active reflective components specifically for large-aperture adaptive optical zoom systems. An active reflective component can change its focal length by physically deforming its reflecting surface. Adaptive optical zoom (AOZ) utilizes active components in order to change magnification and achieve optical zoom, as opposed to traditional zooming systems that move elements along the optical axis. AOZ systems are theoretically examined using a novel optical design theory that enables a full-scale tradespace analysis, where optical design begins from a broad perspective and optimizes to a particular system. The theory applies existing strategies for telescope design and aberration simulation to AOZ, culminating in the design of a Cassegrain objective with a 3.3X zoom ratio and a 375mm entrance aperture. AOZ systems are experimentally examined with the development of a large-aperture active mirror constructed of a composite material called carbon fiber reinforced polymer (CFRP). The active CFRP mirror uses a novel actuation method to change radius of curvature, where actuators press against two annular rings placed on the mirror's back. This method enables the radius of curvature to increase from 2000mm to 2010mm. Closed-loop control maintains good optical performance of 1.05 waves peak-to-valley (with respect to a HeNe laser) when the active CFRP mirror is used in conjunction with a commercial deformable mirror.
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Gisbert, Patricia. "Functionalized imidazolium salts as components in catalytic systems." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/98987.
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CAPÍTULO I. Sales de Hierro e Imidazolio Sustituidas con Grupo Acilo para el Acoplamiento Oxidativo-Tionación de Aminas. En el capítulo I, se ha llevado a cabo el acoplamiento oxidativo de aminas mediado por un catalizador de hierro, para la preparación de tioamidas, de forma eficiente y selectiva en una reacción multicomponente. En la misma, se han utilizado dos aminas diferentes, fosfato de sodio y azufre elemental, bajo calentamiento por microondas. Durante el estudio se ha observado la importancia del catalizador, formado por tetracloroferratos de imidazolio, en el acoplamiento oxidativo y posterior formación del enlace C-S. Esta metodología ha permitido la utilización tanto de bencilaminas primarias y alquilaminas, con diversas propiedades electrónicas, como de derivados de piperidina, demostrando la importancia de esta ruta sintética en la preparación de importantes intermedios sintéticos de productos naturales. CAPÍTULO II. Sistemas Catalíticos Formados por Paladio y Sales de Imidazolio Sustituidas con Grupos Acilo. En el capítulo II, se han sintetizado diferentes sales de imidazolio mono- y di-funcionalizadas con un grupo amido como precursores de sistemas catalíticos en combinación con acetato de paladio(II), usándolos en la reacción de acoplamiento de Heck-Matsuda. A partir del estudio comparativo, se puede concluir que la presencia de un único grupo amido en el precursor del sistema catalítico, formado con una relación 1:1 metal/ligando, es más beneficioso durante el proceso, tal y como se observa en los análisis por espectroscopía UV/Vis. CAPÍTULO III. Cloruro de 1,3-Bis(carboximetil)imidazolio como Catalizador sin Metales para la Síntesis de Quinolinas y Acridinas. En el capítulo III, se ha utilizado el cloruro de 1,3-bis(carboximetil)imidazolio, como catalizador heterogéneo para la preparación, libre de metales y sin uso de disolventes, de quinolinas y acridinas. Esta metodología, sencilla y eficaz para la síntesis de heterociclos con nitrógeno, ha permitido el empleo de diversas cetonas y 2-aminoarilcetonas como precursores, siendo posible la reacción en escala de multigramo. Asimismo, se ha demostrado la aplicabilidad del proceso llevando a cabo la transformación de algunos compuestos a las correspondientes quinolilchalconas mediante una reacción tándem. Además, se ha llevado a cabo el estudio de reciclabilidad del catalizador (hasta 8 ciclos) en la reacción modelo sin observar pérdida de su actividad, remarcando su robustez. Por último, se ha comprobado la sostenibilidad del proceso calculando el factor-E para la formación de quinolinas y la reacción tándem. CAPÍTULO IV. Formación de Enlaces C-C y C-S Catalizada por Cloruro de 1,3-Bis(carboximetil)imidazolio: Síntesis de Tiofenos. En el capítulo IV, se ha empleado el cloruro de 1,3-bis(carboximetil)imidazolio como catalizador para la síntesis de 2,4-diariltiofenos, a través de una autocondensación sulfurativa de la acetofenona. En este proceso, se han estudiado diferentes acetofenonas y cicloalcanonas como precursores, demostrando la simplicidad y eficiencia del proceso para la formación de tiofenos. Además, se ha podido llevar esta reacción a escala de multigramo, siendo, desde el punto de vista de la sostenibilidad, una ruta sintética atractiva.
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Biro, Robert Fuelep. "Visual servoing using industrial components." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/17985.
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Hu, Fuzheng. "Adaptive control for electrohydraulic systems." Thesis, University of Bath, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385225.
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Hellgesson, Markus, and Daniel Andersson. "Design of automatic measurements systems for characterizing RF-components." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-387.
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Cichy, Mark Andrew. "Parametric Design: An Implementation of Bentley Systems Generative Components." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2866.
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This thesis addresses the need for flexible parametric design tools. It focuses on the implementation of a particular tool, Bentley Systems' Generative Components, by exploring features, strengths and weaknesses, and how features can be implemented in design. An exposition of Generative Components is introduced to bridge the gap between the potential and existing power of parametric tools. Through a case study of the Bahá'í Temple for South America this thesis explores the implementation of Generative Components. The exposition argues for the validity of parametric research, specifically its ability to streamline and enhance an architectural design process. The topic of parametric design is further documented in a survey submitted to researchers and developers in the field of parametric research and design. The purpose of this documentation is to place the progression of parametric tools within the context of current development, initiating an open-ended discussion focusing on future research.
This thesis adds to the current development of parametric technology by making particular contributions to tools within the realm of parametric research. Primary contributions include array seeking scripts that search for and replace or duplicate objects, routines for nesting functions within scripts, ideological workflow development and conceptual training through practical application.
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Ngo, Duc Khanh. "Relief Planning Management Systems - Investigation of the Geospatial Components." Thesis, KTH, Geodesi och geoinformatik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118373.
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Azumi, Takuya, Masanari Yamamoto, Yasuo Kominami, Nobuhisa Takagi, Hiroshi Oyama, and Hiroaki Takada. "A New Specification of Software Components for Embedded Systems." IEEE, 2007. http://hdl.handle.net/2237/9438.
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King, A. T. "Effects of perfluorochemical emulsion components in cell culture systems." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238237.
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BITENCOURT, MARIO ANTONIO PINHEIRO. "COMPONENTS OF SOFTWARE FOR THE ANALYSIS OF LOGISTICS SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7843@1.
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Esta dissertação aborda os diversos problemas de
dimensionamento e
análise de transportes, armazenagem e distribuição
física
numa cadeia logística.
Para cada abordagem são apresentados exemplos numéricos
resolvidos através de
algoritmos programáveis. Estes algoritmos compõem um
software desenvolvido
em Delphi 7.0, destinado à instrução de disciplinas
sobre
Sistemas Logísticos em
cursos de pós-graduação.This dissertation approaches several problems in the dimensioning and analysis of transport, storing and physical distribution in a logistics chain. For each approach, numeric examples solved through programmable algorithms are presented. These algorithms make up a software tool developed in DELPHI 7.0 intended to facilitate postgraduate instruction in the field of logistics systems.
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El-Hassan, A. S. "Inheritance in systems comprising reactive components : a behaviour perspective." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/842078/.
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The aggregation hierarchy is one of the most significant data abstraction mechanisms that emerged as a result to semantic extensions to traditional systems analysis and design methods. The way inheritance works in this hierarchy is studied in this thesis. Special emphasis is placed on the behaviour of objects which are related via an aggregation hierarchy. A framework is introduced for capturing the behaviour of a system from the respective behaviour(s) of its components. This framework is based on a 3-level behaviour modelling hierarchy. One of the most significant contributions of this framework is the ability to apply inter-object interactions when building a behaviour model of a system. These interactions are significant in that they can yield totally distinct models of the systems functionality. Some of the notions that are supported by the behaviour modelling framework include unreachable and transient states, transition chains (cascades) and concurrency. The framework also enables the creation of behaviour model (semantic) hierarchies, wherein certain facets of the systems behaviour or functionality can be hidden (abstracted out) in a gradual fashion that suits the requirements of the problem domain. This creates what is effectively, distinct views of the behaviour or functionality of the system. The notions and concepts that are introduced here are verified and presented in a comprehensive case study that shows what can be achieved using these ideas. Suggestions are also made for future work which can help overcome some of the limitations introduced throughout this research.
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Williams, Sandy E. "Interactions between components of rubber agroforestry systems in Indonesia." Thesis, Bangor University, 2000. https://research.bangor.ac.uk/portal/en/theses/interactions-between-components-of-rubber-agroforestry-systems-in-indonesia(c3d48899-f75c-4e88-b305-7d1e31930670).html.
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A prototype agroforestry system, which combined the low-input features and environmental benefits of the traditional Indonesian multi-species 'jungle rubber' system with high yielding rubber clones developed in monoculture plantations, was tested under on-farm conditions. Secondary forest was allowed to regenerate between weeded rows of clonal rubber. Clonal rubber establishment was studied, and the interactions between it, secondary forest species and farmer management were investigated using a combination of researcher- and farmermanaged weeding trials. In one trial, alteration of below-ground resources (using root barriers and trenches to create three soil volumes) did not affect above or below-ground growth of clonal rubber, although weeding significantly increased stem diameter and volume. It was concluded that secondary forest regrowth interfered with resource capture at the level of individual roots; interference was not due to depletion of total available resources. Shoot:root ratios and ratios of horizontally- to vertically-oriented proximal roots were not affected by weeding. Growth of clonal rubber in N-fertilised plots, in the presence of weeds, was significantly greater than in corresponding unfertilised plots, indicating that N-addition may overcome some negative effects of competition in the system. However, a bioassay of nutrient limitation showed no significant differences in root biomass or root-length density, for either rubber or weed rootingrowth into soil cores enriched with various nutrients. The second researcher-managed trial, on steep slopes, showed that the survival rate of clonal rubber was 33% higher than that of the 'seedling' rubber variety traditionally used, and that mean stem height and diameter of clonal rubber trees were significantly greater than those of seedling rubber, 21 months after planting. Damage to trees by banded leaf monkeys (Presbytis melalophos nobilis) and feral pigs (Sus barbatus) was severe, unexpected, and greater for seedling than for clonal rubber. For undamaged trees, weeding frequency within the rubber-tree row had no significant effect, indicating that the major influence on rubber tree growth was interference from secondary forest regrowth between rows, operating both aboveand below-ground. In a farmer-managed, trial, vertebrate pest damage was the major influence on clonal rubber establishment, explaining almost 70% of the variation in rubber growth. The amount of labour invested in weeding was positively correlated with rubber growth. However, fanners generally decided to completely cut back the secondary forest regrowth between rows of rubber trees, including potentially valuable trees, rather than weeding within the rows and selectively pruning inter-row trees. Farmers considered that the inter-row vegetation may harbour vertebrate pests and compete with the clonal rubber, and they had access to fruits, firewood and non-timber forest products on other land. Thus, contrary to expectations, when offered clonal germplasm, these 'progressive' farmers opted to use plantation methods to protect what they considered a valuable asset suited to monoculture, rather than maintain the traditional multispecies strategy they use with local germplasm. Thus, although clonal rubber can technically be established in a 'jungle rubber'-like system (albeit with lower growth rates than achieved in plantations), not all farmers may be prepared to adopt this type of system.
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Hamid, Junainah Abdul. "Enzyme electrodes for food-based systems." Thesis, Cardiff University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316366.
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Bihari, Jeevan Jyoti. "Software emulation of networking components." Virtual Press, 1995. http://liblink.bsu.edu/uhtbin/catkey/935942.
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Software emulation of local area and wide area networks provides an alternative method for the design of such networks and for analyzing their performance. Emulation of bridges and routers that link networks together may provide valuable information regarding network congestion, network storms and the like before putting expensive hardware into place. Such an emulation also enables students taking a networking course to develop their own client-server applications and to visualize the basic functioning of the UDP/IP and RIP protocols.This thesis builds on the emulated local area network, Metanet, created by a previous graduate student. It adds the capability of attaching routers and bridges to multiple local and non-local emulated networks so that data may be transferred between two hosts on different segments of the same LAN (via an emulated bridge) or two different networks altogether (via an emulated router). The machines running the Metanet software should support UNIX which has Berkeley's Socket interface as emulated networks on different physical machines utilize this interface for communicating. A comparison of the new networking capabilities of Metanet and other experimental systems like XINU and MINIX is researched.Department of Computer Science
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Murray, Kevin Paul. "The design of antenna systems on complex structures using characteristic modes." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385200.
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Robbie, M. J. "Regenerative pumps for aircraft fuel systems." Thesis, Cranfield University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359572.
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Alsup, Sarah. "Evaluation of metal leachability from green roof systems and components /." Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1797219561&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.
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Tache, Ricard. "Microstructural characterization of structural components for generation IV nuclear systems." abstract and full text PDF (UNR users only), 2009. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1472983.
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Andersson, Richard. "Evaluation of the Security of Components in Distributed Information Systems." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2091.
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This thesis suggests a security evaluation framework for distributed information systems, responsible for generating a system modelling technique and an evaluation method. The framework is flexible and divides the problem space into smaller, more accomplishable subtasks with the means to focus on specific problems, aspects or system scopes. The information system is modelled by dividing it into increasingly smaller parts, evaluate the separate parts and then build up the system “bottom up” by combining the components. Evaluated components are stored as reusable instances in a component library. The evaluation method is focusing on technological components and is based on the Security Functional Requirements (SFR) of the Common Criteria. The method consists of the following steps: (1) define several security values with different aspects, to get variable evaluations (2) change and establish the set of SFR to fit the thesis, (3) interpret evaluated security functions, and possibly translate them to CIA or PDR, (4) map characteristics from system components to SFR and (5) combine evaluated components into an evaluated subsystem. An ontology is used to, in a versatile and dynamic way, structure the taxonomy and relations of the system components, the security functions, the security values and the risk handling. It is also a step towards defining a common terminology for IT security.
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Setréus, Johan. "Identifying critical components for system reliability in power transmission systems." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40389.
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Large interruptions of power supply in the transmission system have considerable impact on modern society. The goal for the transmission system operator (TSO) is to prevent and mitigate such events with optimal decisions in design, planning, operation and maintenance. Identifying critical power components for system reliability provides one important input to this decision-making. This thesis develops quantitative component reliability importance indices applicable for identifying critical components in real transmission systems. Probabilistic models with component failure statistics are combined with detailed power system models evaluated with the AC power flow technique. In the presented method each system component is assigned three importance indices based on outage events expected probability and consequence to (i) reduced system security margin, (ii) interrupted load supply and (iii) disconnected generation units. By ranking components by each of the three interests, a more complete view of the risks to system reliability can be assessed than if, as traditionally, only (ii) is modelled. The impact on security margin is studied in well established critical transfer sections (CTS) supervised by the TSO. TSOs set the CTSs limits [MW] based on deterministic security criteria, with regard to thermal, voltage level, and system stability limits, and the CTSs' condition at post-contingency state is in the method used as an indicator of the system security margin. The methodology is extended with three indices modified to quantify the component importance for common-cause events initiated by acts of sabotage. The developed methods are applied on a significant part of the Great Britain transmission system, modelling 7000 components and 107 substation layouts. The study includes several load demand scenarios, 200 million initiating outage events and non-functioning protection equipment. The resulting component ranking provides an important input to the TSO's decision-making, and could be implemented as a complement to the existing deterministic N-1 criterion. With the methods applied a TSO can perform further and more detailed assessments on a few critical components in order to enhance system reliability for equipment failures and strengthen the system vulnerability against sabotage.QC 20110920
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Söllner, Matthias [Verfasser]. "Deriving Trust Supporting Components for Ubiquitous Information Systems / Matthias Söllner." Kassel : Kassel University Press, 2014. http://d-nb.info/1074484770/34.
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Kinder, Sebastian. "Automated validation and verification of railway specific components and systems." Aachen Shaker, 2007. http://d-nb.info/987900773/04.
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Corr, Glenn A. "A formalism for describing and simulating systems with interacting components." Thesis, Robert Gordon University, 1996. http://hdl.handle.net/10059/576.
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This thesis addresses the problem of descriptive complexity presented by systems involving a high number of interacting components. It investigates the evaluation measure of performability and its application to such systems. A new description and simulation language, ICE and it's application to performability modelling is presented. ICE (Interacting ComponEnts) is based upon an earlier description language which was first proposed for defining reliability problems. ICE is declarative in style and has a limited number of keywords. The ethos in the development of the language has been to provide an intuitive formalism with a powerful descriptive space. The full syntax of the language is presented with discussion as to its philosophy. The implementation of a discrete event simulator using an ICE interface is described, with use being made of examples to illustrate the functionality of the code and the semantics of the language. Random numbers are used to provide the required stochastic behaviour within the simulator. The behaviour of an industry standard generator within the simulator and different methods of number allocation are shown. A new generator is proposed that is a development of a fast hardware shift register generator and is demonstrated to possess good statistical properties and operational speed. For the purpose of providing a rigorous description of the language and clarification of its semantics, a computational model is developed using the formalism of extended coloured Petri nets. This model also gives an indication of the language's descriptive power relative to that of a recognised and well developed technique. Some recognised temporal and structural problems of system event modelling are identified. and ICE solutions given. The growing research area of ATM communication networks is introduced and a sophisticated top down model of an ATM switch presented. This model is simulated and interesting results are given. A generic ICE framework for performability modelling is developed and demonstrated. This is considered as a positive contribution to the general field of performability research.
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Evans, Peter Sidney Albert. "Transient response testing of linear components within mixed-signal systems." Thesis, University of Huddersfield, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239743.
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Cherian, Roy Pullukattu. "Intelligent systems for design and manufacture of powder metallurgy components." Thesis, University of the West of England, Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327476.
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Zhang, Pan. "Tool flow management in batch manufacturing systems for cylindrical components." Thesis, Loughborough University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307912.
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Legg, Thomas. "Development of high power fibre amplifier components, systems and applications." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25959.
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This thesis contains two projects - the development of a Raman fibre amplifier system for gas sensing and the development of a fibre-in beam-out isolator for use with fibre lasers. The first project developed a fibre Raman amplifier which amplified a 10mW narrow linewidth DFB laser at 1651nm to an output power of over 2W. To achieve this high output power from a narrow linewidth Raman amplifier mechanisms to suppress stimulated Brillouin scattering had to be employed. This amplifier system was packaged into a portable 19” rack enclosure and used to demonstrate remote, single-end, tuneable diode laser spectroscopy of methane. The packaged system detected methane concentrations of 100ppm.m at over 100m during challenging field trials. Extrapolation of lab based measurements to longer distances predicts an ultimate sensitivity of the system of 100ppm.m at greater than 200m. The second project developed a Faraday isolator to be used at the output of industrial fibre lasers. The isolator had an isolation of greater than 30dB, an insertion loss of less than 0.5dB and a return loss of greater than 50dB. The isolator used a dual Faraday rotator design with a half wave plate between the rotators to compensate for thermal stress induced birefringence. Using this approach the isolation was shown to be constant to greater than 60W. The isolator was also compensated for thermal lensing by balancing the positive thermal lens produced in the Faraday rotator with a negative thermal lens in a DKDP crystal. This reduced the thermal lens of the isolator from ~9 Rayleigh length per kW intrinsic to below 2 Rayleigh lengths per kW.
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Ansell, J. I. "Some problems in reliability of systems composed of unreliable components." Thesis, Keele University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373160.
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The thesis considers several connected problems in the study of reliability of systems with unreliable components. Initially it reviews the dichotomic case introducing a new characterization which clarifies the importance of the k-out-of-n structures. This characterization is applied to two problems, failure to operate and to idle and stress-strength modelling. Whilst most previous work has concerned itself with coherent structures, being thought of as reasonable systems, the latter section of the chapter considers the case of non-coherent structures. The following chapter moves from the dichotomic models to multilevel models, considering possible . extensions and producing a hierarchy within the possible definitions. Chapter 3 considers the stochastic properties of such systems, again attension is paid to the k-out-of-n structures and non-coherent models. The final two chapters consider component performance. In chapter 4 the system is assumed to be hierarchical,, so that a component is part of a subsystem, and it is assumed the whole subsystem may be replaced. The effect on the component is examined. The final chapter considers optimal age replacement of a component considering 3 possible alternative criteria.
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Ferreira, Henrique Afonso. "Petri nets based components within globally asynchronous locally synchronous systems." Master's thesis, Faculdade de Ciências e Tecnologia, 2010. http://hdl.handle.net/10362/4796.
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Dissertação apresentada na Faculdade de Ciências e Tecnologias da Universidade Nova de Lisboa para a obtenção do grau de Mestre em Engenharia Electrotécnica e ComputadoresThe main goal is to develop a solution for the interconnection of components constituent of a GALS - Globally Asynchronous, Locally Synchronous – system. The components are implemented in parallel obtained as a result of the partition of a model expressed a Petri net (PN), performed using the PNs editor SNOOPY-IOPT in conjunction with the Split tool and the tools to automatically generate the VHDL code from the representations of the PNML models resulting from the partition (these tools were developed under the project FORDESIGN and are available at http://www.uninova.pt/FORDESIGN). Typical solutions will be analyzed to ensure proper communication between components of the GALS system, as well as characterized and developed an appropriate solution for the interconnection of the components associated with the PN sub-models. The final goal (not attained with this thesis) would be to acquire a tool that allows generation of code for the interconnection solution from the associated components, considering a specific application. The solution proposed for componentes interconnection was coded in VHDL and the implementation platforms used for testing include the Xilinx FPGA Spartan-3 and Virtex-II.
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Covington, Valerie A. "Lower confidence interval bounds for coherent systems with cyclic components." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA242713.
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Thesis (M.S. in Operations Research)--Naval Postgraduate School, September 1990.Thesis Advisor(s): Woods, W. Max. Second Reader: Whitaker, Lyn R. "September 1990." Description based on title screen viewed on December 17, 2009. DTIC Descriptor(s): Computer programs, intervals, confidence limits, accuracy, theses, Monte Carlo method, cycles, fortran, reliability, yield, standardization, statistical distributions, equations, confidence level, poisson density functions, failure, coherence, binomials, computerized simulation. Author(s) subject terms: Reliability, lower confidence limit, coherent systems, cyclic components. Includes bibliographical references (p. 121-122). Also available in print.
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Alsup, Sarah Elizabeth. "EVALUATION OF METAL LEACHABILITY FROM GREEN ROOF SYSTEMS AND COMPONENTS." OpenSIUC, 2008. https://opensiuc.lib.siu.edu/theses/506.
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Green roof technology is becoming increasingly more popular in the U.S. as it provides several economical, sociological, and ecological benefits to urban environments. One specific advantage a vegetated rooftop is known to provide is its ability to retain water and release it at reduced rates. However, with increased interest in these systems, concerns regarding their influence on water quality have been raised. Green roofs can be complex systems and the degree to which water quality might be affected may be related to green roof construction and components within. To answer questions regarding green roof influence on metal contaminants in storm water runoff, a field study and a related laboratory study were designed to investigate potential impacts these systems may have on water quality with respect to heavy metals and some micronutrients. Overall, results obtained for Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn content observed in leachate collected from the constructs and media treatments from a green roof field study do not indicate that green roofs are a significant source of heavy metal and micronutrient contaminants in urban stormwater runoff and that planted Green Roof BlocksTM release less or the same metal content as planted built-in-place models. Elemental concentrations determined in effluent collected from treatments in the field study were collected for four rain events (June 28, 2007, October 18, 2007, February 4, 2008, and April 11, 2008) and compared to IEPA effluent standards to assess whether or not there were any negative impacts on water quality. Treatments for this portion of the investigation were empty built-in-place models (controls), planted and non-planted Arkalyte media at depths of 5 cm, 10 cm, 15 cm, and 20 cm in built-in place models, planted and non-planted commercial and potential green roof media in Green Roof BlocksTM. With the exception of excess Zn levels in collected effluent from the planted 10 cm treatments in October and the planted 5 cm treatments in February as well as the elevated Fe content in leachate obtained from planted glass media in October, metal concentration in effluent acquired from planted treatments were below effluent standards. Also determined to be above IEPA standards in October were Cu, Fe, and Pb measured in effluent obtained from non-planted glass media. The laboratory portion of this investigation evaluated several commercially-available substrates, bottom ash, lava rock, and composted pine bark to determine the total acid extractable and plant exchangeable content of eight elements (Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn). In addition to this, effluent collected from planted and non-planted treatments using these substrates incorporated with 20% composted pine bark were examined over a course of three leaching events. While all elements examined were observed to be within levels normally found in soils, results from the total acid extractable experiments demonstrate large variation in metal concentration with each substrate and composted pine bark. With the exception of total extractable Cd, there were differences in concentrations for the remaining total acid extractable metals between the substrates and amendment tested. An artificial leaching study was conducted in the phytotron at Southern Illinois University Carbondale and consisted of eight repetitions of planted in addition to eight repetitions of non-planted pots containing known volumes of 20 % composted pine bark blended with Arkalyte, Haydite, Lassenite, Axis, bottom ash, Axis + bottom ash, and lava which were subsequently leached over three separate leaching events. Collected effluent was evaluated for Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn content as well as volume of water displaced as a function of planting treatment, number of times leached, and substrate type. Metal content in the leachates were typically an order of magnitude lower than values obtained from the batch studies, and the planting, substrate, and leaching interactions varied for each metal with Pb being the most complex. The volume of water displaced upon leachate collection increased across all substrates as a function of leaching event.
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Alastalo, Ari. "Microelectromechanical resonator-based components for wireless communications : filters and transmission lines /." Espoo VTT, 2006. http://www.vtt.fi/inf/pdf/publications/2006/P616.pdf.
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Huo, Xiao. "High performance passive components modeling and integration in RF/microwave systems /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20HUO.
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Raavi, Jaya Krishna. "Usage of third party components in Heterogeneous systems : An empirical study." Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-11874.
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Context: The development of complex systems of systems leads to high development cost, uncontrollable software quality and low productivity. Thus Component-based software development was used to improve development effort and cost of the software. Heterogeneous systems are the system of systems that consist of functionally independent sub-systems with at least one sub-system exhibiting heterogeneity with respect to other systems. The context of this study is to investigate the usage of third party components in heterogeneous systems. Objectives. In this study an attempt was made to investigate the usage of third party components in heterogeneous systems in order to accomplish the following objectives: Identify different types of third party components. Identify challenges faced while integrating third-party components in heterogeneous systems. Investigate the difference in test design of various third party components Identify what the practitioners learn from various third party components Methods: We have conducted a systematic literature review by following Systematic literature review guidelines by Kitchenham to identify third party components used, challenges faced while integrating third-party components and test design techniques. Qualitative interviews were conducted in order to complement, supplement the finding from the SLR and further provide guidelines to the practitioners using third party components. The studies obtained from the SLR were analyzed in relation to the quality criteria using narrative analysis. The data obtained from interview results were analyzed using thematic analysis. Results: 31 primary studies were obtained from the systematic literature review (SLR). 3 types of third components, 12 challenges, 6 test design techniques were identified from SLR. From the analysis of interviews, it was observed that a total of 21 challenges were identified which complemented the SLR results. In addition, from interview test design techniques used for testing of heterogeneous systems having third party components were investigated. Interviews have also provided 10 Recommendations for the practitioners using different types of third party components in the product development. Conclusions: To conclude, commercial of the shelf systems (COTS and Open software systems (OSS) were the third party components mainly used in heterogeneous systems rather than in-house software from the interview and SLR results. 21 challenges were identified from SLR and interview results. The test design for testing of heterogeneous systems having different third party components vary, Due to the non-availability of source code, dependencies of the subsystems and competence of the component. From the analysis of obtained results, the author has also proposed guidelines to the practitioners based on the type of third party components used for product development.All the information provided are correct as per my knowledge.
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Lüders, Frank. "An evolutionary approach to software components in embedded real-time systems /." Västerås : Department of Computer Science and Electronics, Mälardalen University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-166.
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Costenbader, Jay, and Karen Thorn. "Reusable Software Components for Monitoring and Control of Telemetry Processing Systems." International Foundation for Telemetering, 1993. http://hdl.handle.net/10150/611840.
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International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, NevadaNASA Goddard Space Flight Center (GSFC) has developed a set of functional telemetry processing components based upon Very Large Scale Integration (VLSI) and Application Specific Integrated Circuits (ASIC). These components provide a framework for the assembly of telemetry data ground systems for space projects such as the Earth Observing System (EOS) and the Small Explorer (SMEX) mission series. Implementation of the ground systems for such projects using a common set of functional components has obvious cost benefits in both systems development and maintenance. Given the existence of these components, the next logical step is to utilize a similar approach and create a set of reusable software components for the implementation of telemetry data system monitoring and control functions. This paper describes a generalized set of software components, called the Telemetry Processing Control Environment (TPCE), which has been developed to fulfil this need. This combination of hardware and software components enables the rapid development of flexible, cost-effective telemetry processing systems capable of meeting the performance requirements facing NASA in the coming decade.
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Zografos, Konstantinos. "Intelligent design of microfluidic components for Newtonian and complex fluid systems." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28038.
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Interest in microfluidics has increased dramatically in recent years, with applications spanning a wide range of fields. However, despite several advances, design of microfluidic devices still relies largely on trial-and-error. This thesis aims to go beyond this approach in favour of a rational design of microfluidic devices based on theoretical and numerical design rules and algorithms. More specifically, this research focuses on understanding and controlling fluid dynamics in applications involving complex non-Newtonian fluids in shear and extensional flows. Biomimetic principles and shape optimisation methods are employed to propose new designs for single-phase fluid flow. Furthermore, the singlephase numerical solver is extended to cope with two-phase systems, thus paving the way for new applications of these techniques. Focusing on shear-flows, a biomimetic principle appropriate for fully developed flows has been extended here to be applicable for non-Newtonian fluids, described by the power-law constitutive relationship. The derivation of the principle leads to a biomimetic rule that provides the appropriate dimensions for designing customised microfluidic bifurcating networks, able to generate specific wall shear-stress gradients along consecutive generations. A range of power-law fluids is examined numerically demonstrating great agreement with theoretical predictions. In terms of extensional flow, a range of shapes are proposed for designing microfluidic channels for studies related to the response of complex fluid systems under homogeneous strain-rate. Optimisation techniques are employed for finding the appropriate shapes to generate homogeneous extensional flows along the flow centreline of singlestream (contraction-expansion channels) and the multi-stream designs (T-channels and flow focusing devices). The optimised geometries proposed exhibit enhanced performance compared to well defined geometrical shapes. The in-house single phase solver used in all numerical studies is upgraded here in order to solve numerically 3D-problems related to two-phase systems described by the Phase Field method. Here, the code is validated for 2D-problems only, using a range of test-cases demonstrating a very good quantitative agreement. Keywords: Non-Newtonian fluids, Shear-thinning and shear-thickening behaviour, Bifurcating networks, Biomimetics, Optimisation, Extensional flows, Two-phase systems.
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Shum, Kwan Leung. "Analysis of symmetrical components of harmonics for three phase power systems." Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/7589.
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Includes bibliographical references.Harmonic distortion of three phase power systems is caused by large amounts of electric power consumers using power electronic installations (e.g. drives and rectifiers). It has a number of undesirable consequences and has become an increasingly important problem with the rapid growth and ready availability of the power electronic devices and installations. A famous mathematical technique called "symmetrical components" was used to model the fundamental components of three phase systems. This method was extended to various harmonics. The aim of this thesis is to measure both the magnitude and phase angles of various harmonics which exist in three phase power systems, and to express them in symmetrical components. A digital electronics and microprocessor-based instrument was designed and constructed using the novel signal modulation technique called "+1 and -1" which was developed by the author of this thesis. This instrument was employed to achieve the above objectives.