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Showing 1 to 20 of 79 for “"Geowissenschaften"”.
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Flächenhafte Schätzung mit Classification and Regression Trees und robuste Gütebestimmung ökologischer Parameter in einem kleinen Einzugsgebiet
… dienen. Messungen in den experimentellen Geowissenschaften sind trotz größter Sorgfalt mit Fehlern behaftet. Hierbei handelt es sich sowohl um Rundungs- und gerätebedingte Messungenauigkeiten als auch um extreme Werte. Robuste statistische parametrische Verfahren sind in der Lage, mit …
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Modellierung der Rekristallisationstextur : Wechselwirkung zwischen Keimbildung und Keimwachstum
The influence of nucleation on nucleus growth during primary static recrystallization is investigated with a statistical model of the textural evolution. The presented time resolved model takes into account several physically based and experimentally confirmed nucleation mechanisms. Nucleus growth …
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Das Industriemineral Vermiculit - Enfluß der Rohstoffmineralogie auf die De- und Rehydratation bei der Herstellung von Hochtemperaturdämmstoffen
Vermiculite is an important clay mineral and due to its exfoliation characteristics also used for industrial processing. Over the past years crystal structure and chemistry of selected samples have been extensively investigated. But so far the in-situ investigation of temperature and humidity …
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Ein Multi-Phasen-Feld-Modell für facettiertes Kristallwachstum
Facetted growth of a multi crystalline material from the melt is investigated using a Multi-Phase-Field Model. The model incorporates static anisotropy of interfacial energy and dynamic anisotropy of interface mobility. Its unique feature is the handling of triple junctions between crystals of …
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Geology, petrology and geochemical characteristics of alteration zones within the Seridune prospect, Kerman, Iran
The Seridune district consists of an Eocene volcanic andesite succession with a gently northeast dipping, which was intruded by at least two phases of copper bearing granodiorite porphyries. They are subsequently referred to as “granodiorite stock”, and affiliated “granodiorite dikes” (Late …
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Portable laser-heating system for experiments with diamond anvil cells and its application to studies of geophysically important materials
… den Materialwissenschaften sondern auch in den Geowissenschaften interessant, da sie eine Möglichkeit eröffnen, geophysikalisch relevante Materialien unter Bedingungen des tiefen Erdinneren zu untersuchen. Der Schwerpunkt der hier vorliegenden Arbeit liegt auf dem Entwurf und Test eines mobilen …
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Influence of overexploitation and seawater intrusion on the quality of groundwater in Greater Beirut
The phenomena of seawater intrusion is the most prominent process that degrades the quality of groundwater along coastal aquifers. In Lebanon, it has already increased the salinity of groundwater to such concentrations that it has very little use domestically, industrially or agriculturally. With a …
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Deformation mechanisms of naturally deformed rocksalt
This thesis presents an analysis of deformation and recrystallization processes in a variety of naturally deformed rocksalt. Tools used for the analysis involve simple microtectonic methods: transmitted and reflected light microscopy of gamma-irradiated thin sections and orientation measurements …
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Entwicklung eines hochauflösenden Röntgen-Einkristalldiffraktometers und Strukturuntersuchungen an La 2 - x Sr x CuO 4 - Einkristallen
The first part of this thesis describes the development of a new high resolution x-ray single crystal diffractometer (RED) and its multiple applications. It is shown that the application of the presently available technologies allows very flexible and even completely new possibilities of structural …
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Methoden der EDV-gestützten, dreidimensionalen Lagerstättenmodellierung am Beispiel ausgewählter Bauxitvorkommen
Before the background of a resource-sensitive production and the optimization of metallic raw material flows, this study presents a systematic and uniform methodology to realize the computer-aided three-dimensional modeling of bauxite deposits by use of the exploration and mining Software …
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Numerische Simulation der Kohlenwasserstoffgenese an der Subduktionszone vor Costa Rica
In this study sediment samples drilled during ODP Leg 170 at Sites 1039 and 1040 were analyzed with organic geochemical and organic petrological methods. These methods included determination of organic carbon, sulfur and iron contents, Rock-Eval pyrolysis on sediments and kerogen concentrates as …
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Mikrofazies, Sedimentationsgeschehen und paläogeographische Entwicklung im Verlauf des oberen Viséums im Untergrund der Niederrheinischen Bucht und des Campine-Beckens
The upper Visean (V3) and lower Namurian of the boreholes Schwalmtal 1001 at Viersen (Germany) and Geverik-1 at Geverik (The Netherlands) were the subjects of microfacies analysis and stratigraphic, sedimentologic and petrologic examination. The examined core material of the Schwalmtal 1001 …
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Der Einfluss regionaler Grundwasserfließsysteme auf die Initialphase der Speläogenese tiefer Karstsysteme
This paper gives an overview of the key principles necessary for an understanding of Speleogenesis, including selected speleogenetic models. The most popular of these models at the moment is the four-state model, which attributes the depth of a karst system principally to the depth and spatial …
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Anaerober in-situ-Metabolismus aromatischer Kohlenwasserstoffe unter wechselnden Redox-Verhältnissen bei der Sanierung des Grundwasserleiters an einem ehemaligen Gaswerksstandort
Anaerobic microbial degradation of aromatic hydrocarbons and the occurrence of metabolites were studied in detail in the groundwater of the former manufactured gasplant site at Düsseldorf-Flingern especially with respect to changes due to remediation of soil and groundwater. Physico-chemical …
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Die Erforschungsgeschichte der Eifel-Geologie : 200 Jahre ein klassisches Gebiet geologischer Forschung
The presented work aims at providing the reader with an understanding of the last 200 years of geological exploration in the Eifel. Moreover, it tries to illustrate the historical development from a natural landscape to a cultivated region. Beginning in historical times, the reader is led through …
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Charakterisierung und Bilanzierung vulkanischer Sedimente im Schuttfächer Gran Canarias mit Hilfe petrophysikalischer Bohrloch- und Kernmessungen
ODP Leg 157 drilled into the volcanic apron of Gran Canaria. Low core recovery in depth intervals with high amount of volcanic sediments was compensated by interpretation of continuous downhole measurements. Alongside a reconstruction of the lithology the aim of this investigation is a mass balance …
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Fluid evolution, vein formation and alteration associated with a low angle shear zone at the northern Variscan fold-and-thrust belt in the vicinity of the Aachen Geothermic-drilling, Western Germany
Analyses of fluid inclusions in hydrothermal veins and the alteration mineralogy were performed on samples from the RWTH-1 geothermic well. A detailed textural, structural and fluid inclusion study of distinct vein generations has been performed to correlate the temperature-pressure conditions of …
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An improved dislocation density based work hardening model for Al-Alloys
The objective of the present work is to develop a unified work hardening model to predict the flow behaviour of aluminium and its alloys. A particular advantage of the model presented in the present work is that the output from the model can directly be used as input for subsequent recovery and …
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Petrology, geochemistry, stable and radiogenetic isotopy of the Guelb Moghrein iron oxide copper gold cobalt deposit, Mauritania
The Guelb Moghrein Fe oxide-Cu-Au-Co deposit is located in the central Mauritanides fold and- thrust belt, in the Akjoujt region, northern Mauritania. The deposit is hosted by an Archean metavolcanosedimentary sequence at the western boundaries of the West African Craton. Sericite-quartz- and …
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Organic petrology, maturation, thermal and burial history analysis, and hydrocarbon generation and migration modeling of the Saudi Arabian paleozoic petroleum systems
The major Paleozoic petroleum system of Saudi Arabia is qualitatively characterized by a proven Silurian (Qusaiba Member, Qalibah Formation) source rock, Devonian (Jauf Formation), Permian and Carboniferous (Khuff and Unayzah Formations) reservoirs, a laterally extensive, regional Permian seal …
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