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Das Ziel dieser Arbeit ist einerseits die Erfassung der Durchführung von Einzelfaserzugversuchen und ihren Ergebnissen, welche bis dato in der Literatur beschrieben wurden. Andererseits sollen eigene Untersuchungen durchgeführt werden, um eine Grundlage zur Entwicklung eines Messverfahrens von Kartoneinzelfasern zu schaffen. Dafür wurden unter Beachtung aktuell geltender Normen sowie auf Basis von Erfahrungswerten Zero-Span-Zugversuche durchgeführt und die Messdaten sowie Bruchbilder analysiert. Die Auswertung hat gezeigt, dass sowohl die Einspannlänge von 0,0 mm eingehalten als auch die Faserlaufrichtung beachtet werden muss. Weiterhin konnte die Breite des eingespannten Materials als Parameter identifiziert werden. Die Ergebnisse haben zum einen die Angaben der Literatur bestätigt und zum anderen neue Forschungsaspekte aufgezeigt, die in weiterführenden Untersuchungen überprüft werden können.:1 Einleitung 2 Stand der Wissenschaft 2.1 Material – Karton 2.2 Die Kartonfaser im Netzwerk 2.2.1 Aufbau einer Kartonfaser 2.2.2 Einflussfaktoren auf dem Weg ins Fasernetzwerk 2.3 Zugversuch 2.3.1 Einzelfaserzugversuch - Einzelne Fasern 2.3.2 Einzelfaserzugversuch - Zero-Span 2.3.3 Zugversuch mit zusätzlichen Untersuchungs- und Auswertungsverfahren 3 Experimentelle Untersuchung 4 Auswertung 4.1 Einfluss der Oberflächenbeschaffenheit der Einspannbacken 4.2 Einfluss der Einspannlänge 4.3 Einfluss der Beanspruchungsrichtung 4.4 Einfluss der Probenbreite 4.5 Bruchbildanalyse 5 Fazit und Ausblick

Master of Science / Department of Architectural Engineering and Construction Science / Kimberly W. Kramer / This report is designed to be a valuable tool for any engineer who has had proper instruction in load paths and knowledge of structural steel design but is not familiar with truss systems and has never designed a long-span steel truss. In other words, for someone who knows the math and concepts but not the means, methods, and practical limitations of truss design. By applying their knowledge of engineering concepts and some good judgment with the information in this report they will be able to design an efficient truss. The type of truss considered has a span of 100’ to 200’, is parallel chord, one-way, simply spanned, and constructed of steel. The trusses are evaluated for typically gravity loading and analyzed in two dimensions. Aspects from analysis, layout, fabrication, erection, and transportation are investigated to find ideal methods of design and practical limitations for this type of truss. Once this information is learned it can be to be applied to an individual truss on an individual basis. Engineers need to realize that even though a truss could be designed with the most efficient use of steel it may not be the most economic solution. One must also realize too many variables are present to form rules or equations to always yield the perfect truss. Only by coupling proper design and analysis with knowledge of fabrication and erection will one be able to design an efficient truss.

Orientador: Marcelo da Costa Ferreira / Resumo: Modelos de pontas de pulverização de energia hidráulica construídas na mesma tecnologia apresentam diversas similaridades entre si, porém, o espectro de gotas produzido por cada modelo pode apresentar variações importantes no que se refere a qualidade e segurança das aplicações. O objetivo principal desta pesquisa foi analisar a importância da uniformidade de gotas de pulverização na qualidade de aplicações em culturas de baixo fuste (soja e fava). Como objetivos específicos, buscou-se avaliar a qualidade de pontas de pulverização de energia hidráulica no que se refere às gotas produzidas, potencial de perdas ocasionadas na forma de deriva, vazão, distribuição volumétrica, ângulo de abertura e simetria dos jatos. Foram utilizados nove modelos de pontas de pulverização de jato plano convencionais e jato plano defletor nas vazões nominais de 0,57 e 1,14 L m-1 e jato plano inclinado com vazão nominal de 0,95 L m-1. Como líquidos de pulverização, foram utilizadas caldas fungicidas acrescidas ou não de adjuvantes para caracterização de gotas e aplicações em campo experimental na cultura da soja. Em ambiente controlado utilizou-se solução constituída de água acrescida de marcador fluorescente para aplicações sobre plantas de soja e fava. Os resultados obtidos para caldas fungicidas confirmam diferenças quanto à uniformidade e tamanho das gotas para modelos de pontas e vazões, intrínsecas para cada calda fungicida pulverizada. A partir dos resultados apresentados neste trabalho, é p... (Resumo completo, clicar acesso eletrônico abaixo) / Doutor

Broadband voltage-controlled oscillators are critical to the design of millimeter wave frequency synthesizers. This thesis proposes a design technique that can be used to significantly extend the achievable frequency span of an oscillator. A dual-band oscillator topology is described that can be configured to operate in one of two modes, by an electrical reconfiguration of the negative resistance core around the resonant tank, without switching passive elements within the tank itself. The configuration helps to minimize the difference in phase noise performance between the two modes, while achieving a wide tuning range. To verify the concept, a mm-wave VCO that operates at 30-GHz is designed in a commercial 0.18-um CMOS technology, with an approximate simulated tuning range of 20%. A dual-mode oscillator is also designed in a 0.13-um technology at 60-GHz. / text

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Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains xiv, 153 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 113-114).

Thesis (Psy. D.)--Wheaton College Graduate School, 2007. / Abstract. Includes bibliographical references (leaves 35-40).

Thesis--University of Wisconsin--Madison. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 64-66).

Thesis (Ph. D.)--Drexel University, 2006. / Includes abstract and vita. Includes bibliographical references (leaves 436-440).