S: TC FreyungHochschulschrift
Peter Hofmann
Übertragbarkeit von Methoden und Verfahren in der objektorientierten Bildanalyse - das Beispiel informelle Siedlungen
2005
NachhaltigF: Europan Campus Rottal-InnHochschulschrift
Michael Laar
Untersuchung der Tageslichtnutzung in den feucht-heißen Tropen am Beispiel Rio de Janeiro
2004
DOI: 10.25643/bauhaus-universitaet.47
Abstract anzeigen
Bei der Untersuchung der Tageslichtnutzung in den Tropen werden zunächst die geschichtliche Entwicklung der Architektur in Rio de Janeiro und ihre klimatische Anpassung, die Tageslichtsituation vor Ort und die Bedingungen für den visuellen Komfort an Bildschirmarbeitsplätzen in Bürogebäuden analysiert. In einem zweiten Schritt werden Auslegungskriterien für Tageslichtkontrollsysteme festgelegt und ein Auslegungskonzept erarbeitet. Auf dieser Grundlage wird über Simulationen mit Siview/Radiance das Potential 12 verschiedener Tageslichtkontrollsysteme für verschiedene Himmelszustände ermittelt. Über eine neu entwickelte Methodik wird die Tageslichtautonomie für verschiedene Fassadenorientierungen unter Einsatz der entwickelten Tageslichtkontrollsysteme für den Standort Rio de Janeiro ermittelt. Der Einfluss der Möblierung wird beispielhaft untersucht. Abschließend wird eine energetische Bilanz, die sowohl die Kunstlichteinsparung als auch die Kühllast durch Kunst- und Tageslicht berücksichtigt, an zwei Systemen beispielhaft erstellt.
NachhaltigF: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Europan Campus Rottal-InnHochschulschrift
Sascha Kreiskott
Supraleitende YBa2Cu3O7-δδ-Schichten auf metallischen Bändern
2001
Abstract anzeigen
For the use of high-temperature superconducting materials in energy technology flexiblewires or tapes are needed. Up to now two different routes for their fabrication do exist.Primary there is the powder in tube process, which uses polycrystalline BSCCO powder in asilver tube. Secondary there are the coated conductor concepts, which use a metallic tape as asubstrate for the deposition of buffer and superconducting layers. In order to achieve highcritical current densities biaxially textured layers of the superconductor YBCO are necessary.As a consequence either the substrates (RABiTS: rolling assisted biaxially textured substratesapproach) or the deposited buffers (IBAD: ion beam assisted deposition approach) have to betextured. In this thesis the RABiTS approach was used to produce short samples ofsuperconducting tapes.One of the most important aspects of the RABiTS technique is the deposition of buffer layers,which serve as a chemical barrier between the ferromagnetic Nickel substrate and match thestructural properties of the substrate tape and the YBCO layer. In order to deposit high qualityYBCO films on textured Nickel substrates highly (100) textured and crack free buffer layersare needed. Only few materials such as CeO2 and Yttria-stabilised Zirconia (YSZ) are suitedfor the use as a buffer layer. In this thesis several deposition techniques such as rf sputtering,thermal reactive evaporation and electron beam evaporation were developed and tested for thedeposition of CeO2 and YSZ. The buffer layers were characterised by XRD, SEM and opticalmicroscopy. The growth behaviour of CeO2 on Nickel was studied in detail to ensure (100)oriented growth on the cube textured Nickel substrate. Growth conditions for the reproducibledeposition of (100) oriented buffer layers could be found.YBCO films were deposited by dc-sputtering on the buffer layers and the resultingsuperconducting properties were measured by inductive characterisation and transport currentmeasurements. The cracking of the buffer layers during the highly oxidising conditions of theYBCO deposition process turned out to be the main obstacle to achieving goodsuperconducting properties. After optimisation critical current densities up to 0.6 MA/cm2(77 K, 0 T) and critical temperatures of 91 K with transition widths of 3 K could be obtainedin 400 nm thick YBCO films on exclusively evaporated CeO2/YSZ/CeO2 buffer architectures.These layers still showed cracks after the YBCO deposition, which seemed to be the cause forthe low critical current densities. Buffer architectures with evaporated CeO2 followed bysputtering of YSZ and CeO2 remained crack free after the YBCO deposition. Critical currentdensities between 1.5 and 2.6 MA/cm2 (77 K, 0 T) in 400 nm thick films could be achievedreproducibly. The transition temperatures were measured to be between 91 and 92 K withtransition widths of 1.5 K.
F: Maschinenbau und MechatronikHochschulschrift
Simone Walker-Hertkorn
Geothermal energy - an important but disregarded form of renewable energy
Geological situation, projects and economy in Austria
2000
Abstract anzeigen
This study deals with the topic geothermal energy. Although geothermal energy is an important energy sector within the area of the renewable energies, the European policy downgraded this important, promising energy sector in 1999. Normally, geothermal energy cannot be regarded as a renewable energy source because the heat content of the Earth, the gravitational heat, the source heat, frictional heat and the decay of radioactive isotopes in the further process of geologic history will eventually be exhausted. However, we are referring here to many millions of years. At the present time, geothermal energy can thus be regarded as an inexhaustible renewable energy source. This work is focused on the geothermal situation in Austria. For many people, the term 'geothermal energy' is associated with countries such as Iceland, Italy (Larderello) and New Zealand. However, in Austria there are also innovative projects in the geothermal energy sector that only very few people know about. Some of these trend-setting projects are presented here. Regarding the total situation in Austria, the geothermal potential is described specifically for the Calcareous Alpine nappe and the Vienna Basin. Furthermore, the first results concerning successful injection in Upper Austria and up to now unconsidered locations for geothermal energy plants are presented. This work attempts to present the attractiveness of geothermal energy projects to the public, thus emphasizing the importance of discussing it again on the political level.
I: Hochschulleitung und -einrichtungenHochschulschrift
Gregor Jaburek
Die deliktische Haftung des GmbH-Geschäftsführers für fehlerhafte Buchführung
1999
Abstract anzeigen
Ursache für den Vermögensverfall einer GmbH ist oft eine unzulängliche und fehlerhafte Buchführung. Verantwortlich ist der Geschäftsführer der GmbH. Ob geschädigte Gesellschaftsgläubiger den Geschäftsführer deswegen persönlich in Anspruch nehmen können, untersucht der Verfasser des folgenden Beitrags.
S: TC FreyungHochschulschrift
Peter Hofmann
Die Anwendung fernerkundlicher Daten und Methoden im Geomarketing, untersucht am Beispiel einer KFA-1000-Aufnahme von München
1997
Version: 2.1.2-qf2