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Now showing items 4713-4732 of 6942
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Optimized reconstruction of the crystallographic orientation density function based on a reduced set of orientations
(Journal of Applied Crystallography, 2020)Crystallographic textures, as they develop for example during cold forming, can have a significant influence on the mechanical properties of metals, such as plastic anisotropy. Textures are typically characterized by a ... -
„Orbulina” bituminosa SPANDEL, 1909, ein Mikroproblematikum aus dem Fischschiefer (Rupelium) des Mainzer Beckens
(Mainzer geowissenschaftliche Mitteilungen; 25. 1996)Im Fischschiefer (Rupelium) des Mainzer Beckens werden häufig hohle Kugeln von etwa 200 m Durchmesser gefunden. SPANDEL (1909) hat diese als Orbulina bituminosa beschrieben und den Foraminiferen zugeordnet. Aufgrund der ... -
Organic molecular markers and signature from wood combustion particles in winter ambient aerosols: aerosol mass spectrometer (AMS) and high time-resolved GC-MS measurements in Augsburg, Germany
(Atmospheric Chemistry and Physics, 2012)The impact of wood combustion on ambient aerosols was investigated in Augsburg, Germany during a winter measurement campaign of a six-week period. Special attention was paid to the high time resolution observations ... -
Organogene Serie einer pleistozänen Warmzeit vom Typ Bederkesa
(E&G – Quaternary Science Journal; Vol.19, No. 1)Eine organogene Serie im Geeste-Elbe-Kanal bei Bederkesa (Kreis Wesermünde) wird moorstratigraphisch und pollenanalytisch untersucht. Zum ersten Mal wurden dabei neben Übereinstimmungen mit organogenen Bildungen des Eems ... -
Origin and fate of dissolved organic matter in four shallow Baltic Sea estuaries
(Biogeochemistry, 2020-10-15)Coastal waters have strong gradients in dissolved organic matter (DOM) quantity and characteristics, originating from terrestrial inputs and autochthonous production. Enclosed seas with high freshwater input therefore ... -
Origin of 182W Anomalies in Ocean Island Basalts
(Geochemistry, Geophysics, Geosystems, 2023-02-18)Ocean island basalts (OIB) show variable 182W deficits that have been attributed to either early differentiation of the mantle or core‐mantle interaction. However, 182W variations may also reflect ... -
Origin of Central Andean collapse calderas
(11. Symposium "Tektonik, Struktur- und Kristallingeologie", 2006-03)Regional strains in tectonically active volcanic provinces may have a profound influence on the mode of collapse caldera formation. Conversely, the deformation pattern, more specifically, the symmetry of plan-view strain ... -
Origin of High Mg and SO4 Fluids in Sediments of the Terceira Rift, Azores-Indications for Caminite Dissolution in a Waning Hydrothermal System
(Geochemistry, Geophysics, Geosystems, 2019)During R/V Meteor cruise 141/1, pore fluids of near surface sediments were investigated to find indications for hydrothermal activity in the Terceira Rift (TR), a hyperslow spreading center in the Central North Atlantic ... -
Origin of isolated seamounts in the Canary Basin (East Atlantic): The role of plume material in the origin of seamounts not associated with hotspot tracks
(Terra Nova, 2020)In contrast to seamount chains, small solitary seamounts/seamount groups have rarely been sampled despite their large number and therefore their origins remain enigmatic. Here we present new 40Ar/39Ar, trace element and ... -
Origin of Weakened Interannual Sea Surface Temperature Variability in the Southeastern Tropical Atlantic Ocean
(Geophysical Research Letters, 2020)Observations and reanalysis products are used to investigate the substantial weakening in the southeastern tropical Atlantic sea surface temperature (SST) variability since 2000. Relative to 1982–1999, the March-April-May ... -
Orogen-scale transpression accounts for GPS velocities and kinematic partitioning in the Southern Andes
(Communications Earth & Environment, 2021-08-19)The Southern Andes are regarded as a typical subduction orogen formed by oblique plate convergence. However, there is considerable uncertainty as to how deformation is kinematically partitioned in the upper plate. Here we ... -
Os, Sr, Nd, Pb, O isotope and trace element data from the Ferrar flood basalts, antarctica: evidence for an enriched subcontinental lithospheric source
(Earth and Planetary Science Letters, 1996)Os, Sr, Nd, Pb and O isotopes and trace element data are reported for basaltic andesite and andesite whole rocks and, in part, for selected mineral separates from the Jurassic Ferrar flood basalt province. Radiogenic Sr ... -
Osteologische Untersuchungen an Pseudosciuriden (Rodentia, Theridomorpha) des süddeutschen Alttertiärs
(Mainzer geowissenschaftliche Mitteilungen; 21. 1992)Die Arbeit stellt Untersuchungen des postcranialen Skeletts der vier Pseudosciuriden- Arten Pseudosciurus suevicus, Suevosciurus ehingensis, Suevosciurus fraasi und Suevosciurus dehmi aus süddeutschen Spaltenfüllungen ... -
Otolithen aus dem Unter-Pliozän von Süd-Sizilien und aus der Toscana
(Reimer, Berlin, 1978)Aus altersmäßig nur geringfügig unterschiedlichen Ablagerungen des Unter-Pliozän von Süd-Sizilien, von Fundstellen in der Umgebung der Städte Agrigent, Porto Empedocle und Sciacca, und aus der Toscana, von Fundstellen bei ... -
Overcoming the Model‐Data‐Fit Problem in Porous Media: A Quantitative Method to Compare Invasion‐Percolation Models to High‐Resolution Data
(Water Resources Research, 2021-07-13)Invasion percolation (IP) models offer a computationally inexpensive way to simulate multiphase flow in porous media, but only very few studies have compared their results to actual laboratory experimental image data. One ... -
Overlooked Implication of Sediment Transport at Low Flow: Migrating Ripples Modulate Streambed Phototrophic and Heterotrophic Microbial Activity
(Water Resources Research, 2021-03-17)Sandy streambeds are mobile even at low flow velocities at which sediments can be transported as bedload, more specifically as migrating ripples. Small variations in discharge can result in transitions between sediment ... -
Oxidativer Torfverzehr in Niedermoor in Abhängigkeit vom Klima und mögliche Schutzmaßnahmen
(TELMA - Berichte der Deutschen Gesellschaft für Moor- und Torfkunde; Band 08; 1978)Einleitend werden Ursachen und Ausmaß der Höhenverluste im Niedermoor aufgezeigt (Abb. 1). Ferner wird der oxidative Torfverzehr in Abhängigkeit vom Klima mittels Regenfaktor nach LANG (1915) dargelegt (Abb. 2). Feldmessungen ... -
Oxygen and Carbon Isotope Variations in a Modern Rodent Community – Implications for Palaeoenvironmental Reconstructions
(PLoS ONE, 2012-11-19)Background: The oxygen (d18O) and carbon (d13C) isotope compositions of bioapatite from skeletal remains of fossil mammals are well-established proxies for the reconstruction of palaeoenvironmental and palaeoclimatic ... -
Oxygen Consumption of Resuspended Sediments of the Upper Elbe Estuary: Process Identification and Prognosis
(Aquatic Geochemistry, 2021-11-30)The resuspension of sediment leads to an increased release of nutrients and organic substances into the overlying water column, which can have a negative effect on the oxygen budget. Especially in the warmer months with a ... -
Oxygen Dependent Temperature Regulation of Benthic Fluxes in Reservoirs
(Global Biogeochemical Cycles, 2023-04-02)Temperature and dissolved oxygen concentration are critical factors affecting the exchange of solutes between sediment and water; both factors will be affected by warming of lakes and thereby influence water quality. ...