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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Mathematical Modeling and Analysis of a Variable Displacement Hydraulic Bent Axis Pump Linked to High Pressure and Low Pressure Accumulators

Abuhaiba, Mohammad 16 June 2009 (has links)
No description available.
92

Studium vlastností FRP kompozitních materiálů pro vyztužování betonu / Study of FRP for concrete reinforcement

Blahová, Aneta January 2022 (has links)
The diploma thesis aims to analyze bent FRP reinforcements. It describes the method of production of bent FRP reinforcement, examples of application of FRR reinforcement in structures and mentions aggressive influences influencing the durability of FRP reinforcement. Furthermore, an experiment is proposed to monitor changes in straight and bent FRP reinforcement stored in an aqueous environment at 20 °C and an alkaline environment at 20 °C and 40 °C. The output of the diploma thesis is the evaluation of changes in mechanical properties and durability. The condition of the FRP reinforcement is documented using optical and electron mocroscopy.
93

Urbanisticko – architektonická studie areálu pro šetrný turismus Strachotín / Urban and architectural study of environmentally friendly tourist area Strachotín.

Malůšek, Jan Unknown Date (has links)
ANNOTATION On the banks of the Střední Novomlýnská reservoir, in the cadastre of the municipality of Strachotín, the diploma thesis presents the overall design of a multifunctional complex, based on a sensitive connection between organic farming, well-breeding, and eco-tourism. The proposal shows the concept of farming in a "closed circle", with regard to the environment. The urban solution deals with the selected land with an area of 20 ha. The architectural part closely introduces the system of objects, creating a new landscape, perceived by both a human and bird's eye perspective. The layout solution analyzes in detail the functional arrangement of the farm, trying to meet all the requirements for efficient management while maintaining the organic regime and the coexistence of visitors and employees. The complex also offers a restaurant, multifunctional hall, conference rooms, classrooms, workshops, a gym, and exhibition areas. Accommodation is provided by a system of separate buildings, presenting the current possibilities of natural construction and environmentally friendly technologies to the guests, while maintaining the comfort of living. The farm is fully equipped for weddings or corporate events. The design and material solution use a maximum of natural materials in combination with current technologies. In addition to designing a viable multifunctional unit, the aim of the thesis is also to bring added value to the region, by holding annual cultural events and regular activities for children and seniors from the surrounding municipalities. At the same time, the work aims to create a sensitive counterpoint to current tourist destinations in the area.
94

NATURAL HYSTERIA (a queer response to ecocide): An exercise in Living Art, Participatory Rituals and Queer Ecology -or- How I discovered Geyserbird, the Transgender Shaman within

Bell, Graham 05 November 2018 (has links)
Resumen Natural Hysteria... es una investigacio'n basada en una pra'ctica transdisciplinaria que documenta el proceso de produccio'n de un ciclo de performances basadas en el texto: rituales, presentaciones teatrales, acciones callejeras y presentaciones de video, canciones y talleres. Es una respuesta arti'stica al deterioro de nuestro medio ambiente y los ataques contra la diversidad cultural y biolo'gica que esta'n llevando a cabo un sistema capitalista basado en la acumulacio'n de riqueza a toda costa que nos esta' llevando al borde de un colapso ecolo'gico. Se procede a trave's de un ana'lisis de otras pra'cticas arti'sticas disidentes que comparten una perspectiva queer, feminista, postcolonial o ecolo'gica que las vincula a los conceptos explorados en mi trabajo para contextualizarlo en el campo expandido de las artes contempora'neas. La "histeria" alternativa que forma la base conceptual de este proyecto tiene sus inicios en los albores de la edad moderna y traza una historia de dominacio'n de los "otros": se centra principalmente en las mujeres, en el ge'nero y en los disidentes sexuales, las personas de color y los animales. La explotacio'n de los recursos naturales y humanos es una consecuencia de una cosmovisio'n basada en el establecimiento de oposiciones binarias que permiten que el "otro" sea clasificado y dominado. Por ejemplo: hombre / mujer, blanco / negro, hetero / homosexual, cultura / naturaleza. La construccio'n de estos "otros" - "femenino", "nativo", "queer", "naturaleza" - excluye a estos sujetos de la construccio'n de una identidad dominante que, sin embargo, depende de estas categori'as para su existencia. En el Renacimiento, los campos de las ciencias y las humanidades no estaban separados. La visio'n mecanicista del mundo no habi'a superado por completo las creencias paganas en la magia y en una fuerza espiritual que reside en todos los seres. Esta visio'n era una reliquia de la era precristiana y finalmente seri'a erradicada por las fuerzas unidas del Estado y la Iglesia a trave's de los procesos de la Inquisicio'n, la caza de brujas, la colonizacio'n y la nueva religio'n de la "Ciencia". Todos estos procesos han producido un gran cambio en nuestra relacio'n con la naturaleza, que en la actualidad se considera una entidad totalmente inerte. La naturaleza ya no forma parte de nuestro ser y se ha convertido simplemente en materia prima. La colonizacio'n continu'a hoy bajo una poli'tica neoliberal que utiliza el concepto de desarrollo para requisar territorio de los pueblos indi'genas a fin de explotar sus recursos naturales. Esto se justifica clasificando estas personas como primitivas porque su modo de vida se basa en vivir en equilibrio con la naturaleza. La funcio'n de una pra'ctica arti'stica poli'ticamente comprometida es desafiar la nocio'n de que no existe una alternativa al sistema actual. El marco teo'rico y arti'stico de esta investigacio'n ha conducido al desarrollo de un alter ego performativo, el chama'n transge'nero Geyserbird, y a la configuracio'n de una serie de performances que incluye rituales participativos, instalaciones con presencia y la reapropiacio'n queer de espacios industriales abandonados. El chama'n transge'nero es un ser espiritual que va ma's alla' de las limitaciones del sistema de ge'nero binario y se conecta con las culturas indi'genas. El despliegue de esta figura en un contexto contempora'neo invita al pu'blico a imaginar otras posibilidades para si' mismos y para nuestra sociedad. / Abstract Natural Hysteria... is a trans-disciplinary practice led investigation which documents the process of production of a cycle of text based performances -rituals, street actions, theatrical presentations, and video presentations, songs and workshops. It is an artistic response to the deterioration of our environment and the attacks on cultural and biological diversity being carried out by a capitalist system based on the accumulation of wealth at all costs which is leading us to the border of an ecological collapse. It proceeds through an analyses of other dissident artistic practices which share a queer, feminist postcolonial or ecological perspective linking them to the concepts explored in my work in order to contextualise it in the expanded field of the contemporary arts. The alternative "hysteria" that forms the conceptual basis of this project has its beginnings in the dawn of the modern age and traces a history of domination of those "others": focusing mainly on women, gender and sexual dissidents, people of colour and animals. The exploitation of natural and human resources is a consequence of a worldview based on the establishment of binary oppositions that allow the "other" to be classified and dominated. For example: man / woman, white / black, hetero / homosexual, culture / nature. The construction of these "others" - the "feminine", the "native", the "queer", "nature" - excludes these subjects from the construction of a master identity that, nevertheless, depends on these categories for its existence. In the Renaissance the fields of the sciences and the humanities were not separated. The mechanistic view of the world had not completely overcome pagan beliefs in magic and in a spiritual force which resides in all beings. This vision was a relic of the pre-Christian era and would finally be eradicated by the united forces of State and Church through the processes of the Inquisition, the witch hunts, colonization and the new religion of "Science". All of these processes have produced a huge change in our relationship with nature, currently seen as a totally inert entity. Nature is no longer part of our being and has became nothing more than raw material. Colonisation continues today under a neoliberal politics which uses the concept of development to requisition territory from indigenous people in order to exploit its natural resources. This is justified by qualifying these people as primitive because their way of life is based on living in equilibrium with nature. The function of a politically engaged artistic practise is to challenge the notion that no alternative exists to the current system. The theoretical and artistic framework of this investigation has led to the development of a performative alter ego, the transgender shaman Geyserbird, and to the configuration of a series of performances which included participatory rituals, installations with presence and the queer appropriation of abandoned industrial spaces. The transgender shaman is a spiritual being who goes beyond the limitations of the binary gender system and connects to indigenous cultures. The deployment of this figure in a contemporary context, invites the public to imagine other possibilities for themselves and for our society / Resum Natural Hysteria... e's una investigacio' basada en una pra¿ctica transdisciplina¿ria que documenta el proce's de produccio' d'un cicle de performances basades en el text: rituals, presentacions teatrals, acciones al carrers i presentacions de vi'deo, canc¿ons i tallers. E's una resposta arti'stica a la deteriorament del nostre medi ambient i els atacs contra la diversitat cultural i biolo¿gica que esta¿ duent a terme un sistema capitalista basat en l'acumulacio' de riquesa costi el que costi que ens esta¿ portant a la vora d'un col·lapse ecolo¿gic. Es procedeix a trave's d'una ana¿lisi d'altres pra¿ctiques arti'stiques dissidents que comparteixen una perspectiva queer, feminista, postcolonial o ecolo¿gica que les vincula amb els conceptes explorats en el meu treball per contextualitzar-ho en el camp expandit de les arts contempora¿nies. La "histe¿ria" alternativa que forma la base conceptual d'aquest projecte te' els seus inicis en les albors de l'edat moderna i trac¿a una histo¿ria de dominacio' dels "altres": se centra principalment en les dones, en el ge¿nere i en els dissidents sexuals, les persones de color i els animals. L'explotacio' dels recursos naturals i humans e's una consequ¿e¿ncia d'una cosmovisio' basada en l'establiment d'oposicions bina¿ries que permeten que l'"altre" sigui classificat i dominat. Per exemple: home / dona, blanc / negre, hetero / homosexual, cultura / naturalesa. La construccio' d'aquests "altres" - "femeni'", "natiu", "queer", "naturalesa" - exclou aquests subjectes de la construccio' d'una identitat dominant que, no obstant aixo¿, depe'n d'aquestes categories per a la seua existe¿ncia. En el Renaixement, els camps de les cie¿ncies i les humanitats no estaven separats. La visio' mecanicista del mo'n no havia superat per complet les creences paganes en la ma¿gia i en una forc¿a espiritual que resideix en tots els e'ssers. Aquesta visio' era una reli'quia de l'era precristiana i finalment seria eradicada per les forces unides de l'Estat i l'Esgle'sia a trave's dels processos de la Inquisicio', la cac¿a de bruixes, la colonitzacio' i la nova religio' de la "Cie¿ncia". Tots aquests processos han produi¿t un gran canvi en la nostra relacio' amb la naturalesa, que en l'actualitat es considera una entitat totalment inerta. La naturalesa ja no forma part del nostre e'sser i s'ha convertit simplement en mate¿ria preval. La colonitzacio' continua avui sota una poli'tica neoliberal que utilitza el concepte de desenvolupament per a requisar territori dels pobles indi'genes a fi d'explotar els seus recursos naturals. Aixo¿ es justifica classificant aquestes persones com a primitives perque¿ la seua manera de vida es basa en viure en equilibri amb la naturalesa. La funcio' d'una pra¿ctica arti'stica poli'ticament compromesa e's desafiar la nocio' que no existeix una alternativa al sistema actual. El marc teo¿ric i arti'stic d'aquesta investigacio' ha condui¿t al desenvolupament d'un alter ego performatiu, el xaman transge¿nere Geyserbird, i a la configuracio' d'una se¿rie de performances que inclou rituals participatius, instal·lacions amb prese¿ncia i la reapropiacio' queer d'espais industrials abandonats. El xaman transge¿nere e's un ser espiritual que va me's enlla¿ de les limitacions del sistema de ge¿nere binari i es connecta amb les cultures indi'genes. El desplegament d'aquesta figura en un context contemporani convida al pu'blic a imaginar altres possibilitats per a ells mateixos i per a la nostra societat. / Bell, G. (2018). NATURAL HYSTERIA (a queer response to ecocide): An exercise in Living Art, Participatory Rituals and Queer Ecology -or- How I discovered Geyserbird, the Transgender Shaman within [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/111925
95

Advanced electronic structure theory: from molecules to crystals / Höhere Elektronenstrukturtheorie: vom Molekül zum Kristall

Buth, Christian 21 October 2005 (has links) (PDF)
In dieser Dissertation werden ab initio Theorien zur Beschreibung der Zustände von perfekten halbleitenden und nichtleitenden Kristallen, unter Berücksichtigung elektronischer Korrelationen, abgeleitet und angewandt. Als Ausgangsbasis dient hierzu die Hartree-Fock Approximation in Verbindung mit Wannier-Orbitalen. Darauf aufbauend studiere ich zunächst in Teil I der Abhandlung den Grundzustand der wasserstoffbrückengebundenen Fluorwasserstoff und Chlorwasserstoff zick-zack Ketten und analysiere die langreichweitigen Korrelationsbeiträge. Dabei mache ich die Basissatzextrapolationstechniken, die für kleine Moleküle entwickelt wurden, zur Berechnung von hochgenauen Bindungsenergien von Kristallen nutzbar. In Teil II der Arbeit leite ich zunächst eine quantenfeldtheoretische ab initio Beschreibung von Elektroneneinfangzuständen und Lochzuständen in Kristallen her. Grundlage hierbei ist das etablierte algebraische diagrammatische Konstruktionsschema (ADC) zur Approximation der Selbstenergie für die Bestimmung der Vielteilchen-Green's-Funktion mittels der Dyson-Gleichung. Die volle Translationssymmetrie des Problems wird hierbei beachtet und die Lokalität elektronischer Korrelationen ausgenutzt. Das resultierende Schema wird Kristallorbital-ADC (CO-ADC) genannt. Ich berechne damit die Quasiteilchenbandstruktur einer Fluorwasserstoffkette und eines Lithiumfluoridkristalls. In beiden Fällen erhalte ich eine sehr gute Übereinstimmung zwischen meinen Resultaten und den Ergebnissen aus anderen Methoden. / In this dissertation, theories for the ab initio description of the states of perfect semiconducting and insulating crystals are derived and applied. Electron correlations are treated thoroughly based on the Hartree-Fock approximation formulated in terms of Wannier orbitals. In part I of the treatise, I study the ground state of hydrogen-bonded hydrogen fluoride and hydrogen chloride zig-zag chains. I analyse the long-range contributions of electron correlations. Thereby, I employ basis set extrapolation techniques, which have originally been developed for small molecules, to also obtain highly accurate binding energies of crystals. In part II of the thesis, I devise an ab initio description of the electron attachment and electron removal states of crystals using methods of quantum field theory. I harness the well-established algebraic diagrammatic construction scheme (ADC) to approximate the self-energy, used in conjunction with the Dyson equation, to determine the many-particle Green's function for crystals. Thereby, the translational symmetry of the problem and the locality of electron correlations are fully exploited. The resulting scheme is termed crystal orbital ADC (CO-ADC). It is applied to obtain the quasiparticle band structure of a hydrogen fluoride chain and a lithium fluoride crystal. In both cases, a very good agreement of my results to those determined with other methods is observed.
96

Advanced electronic structure theory: from molecules to crystals

Buth, Christian 10 November 2005 (has links)
In dieser Dissertation werden ab initio Theorien zur Beschreibung der Zustände von perfekten halbleitenden und nichtleitenden Kristallen, unter Berücksichtigung elektronischer Korrelationen, abgeleitet und angewandt. Als Ausgangsbasis dient hierzu die Hartree-Fock Approximation in Verbindung mit Wannier-Orbitalen. Darauf aufbauend studiere ich zunächst in Teil I der Abhandlung den Grundzustand der wasserstoffbrückengebundenen Fluorwasserstoff und Chlorwasserstoff zick-zack Ketten und analysiere die langreichweitigen Korrelationsbeiträge. Dabei mache ich die Basissatzextrapolationstechniken, die für kleine Moleküle entwickelt wurden, zur Berechnung von hochgenauen Bindungsenergien von Kristallen nutzbar. In Teil II der Arbeit leite ich zunächst eine quantenfeldtheoretische ab initio Beschreibung von Elektroneneinfangzuständen und Lochzuständen in Kristallen her. Grundlage hierbei ist das etablierte algebraische diagrammatische Konstruktionsschema (ADC) zur Approximation der Selbstenergie für die Bestimmung der Vielteilchen-Green's-Funktion mittels der Dyson-Gleichung. Die volle Translationssymmetrie des Problems wird hierbei beachtet und die Lokalität elektronischer Korrelationen ausgenutzt. Das resultierende Schema wird Kristallorbital-ADC (CO-ADC) genannt. Ich berechne damit die Quasiteilchenbandstruktur einer Fluorwasserstoffkette und eines Lithiumfluoridkristalls. In beiden Fällen erhalte ich eine sehr gute Übereinstimmung zwischen meinen Resultaten und den Ergebnissen aus anderen Methoden. / In this dissertation, theories for the ab initio description of the states of perfect semiconducting and insulating crystals are derived and applied. Electron correlations are treated thoroughly based on the Hartree-Fock approximation formulated in terms of Wannier orbitals. In part I of the treatise, I study the ground state of hydrogen-bonded hydrogen fluoride and hydrogen chloride zig-zag chains. I analyse the long-range contributions of electron correlations. Thereby, I employ basis set extrapolation techniques, which have originally been developed for small molecules, to also obtain highly accurate binding energies of crystals. In part II of the thesis, I devise an ab initio description of the electron attachment and electron removal states of crystals using methods of quantum field theory. I harness the well-established algebraic diagrammatic construction scheme (ADC) to approximate the self-energy, used in conjunction with the Dyson equation, to determine the many-particle Green's function for crystals. Thereby, the translational symmetry of the problem and the locality of electron correlations are fully exploited. The resulting scheme is termed crystal orbital ADC (CO-ADC). It is applied to obtain the quasiparticle band structure of a hydrogen fluoride chain and a lithium fluoride crystal. In both cases, a very good agreement of my results to those determined with other methods is observed.

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