Auflistung Geochemie, Mineralogie, Petrologie nach Titel
Anzeige der Dokumente 134-153 von 562
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Effect of Compaction Banding on the Hydraulic Properties of Porous Rock - Part II: Constitutive Description and Numerical Simulations
(Rock Mechanics and Rock Engineering, 2021-03-23)In this paper the performance of a constitutive model for the description of the hydro mechanical behaviour of soft rock is evaluated with respect to the experimentally observed behaviour of Maastricht Calcarenite under ... -
Effect of Compaction Banding on the Hydraulic Properties of Porous Rock: Part I—Experimental Investigation
(Rock Mechanics and Rock Engineering, 2021-03-23)The mechanical behavior and the influence of compaction banding on the hydraulic properties in soft porous rocks were studied. The tested rock was Calcarenite Tuffeau de Maastricht. In the frame of experimental investigations, ... -
Effect of Fe3+ on Phase Relations in the Lower Mantle: Implications for Redox Melting in Stagnant Slabs
(Journal of Geophysical Research: Solid Earth, 2019)Recent studies have revealed that Earth's deep mantle may have a wider range of oxygen fugacities than previously thought. Such a large heterogeneity might be caused by material subducted into the deep mantle. However, ... -
Effective Diahaline Diffusivities in Estuaries
(Journal of Advances in Modeling Earth Systems, 2021-02-01)The present study aims to estimate effective diahaline turbulent salinity fluxes and diffusivities in numerical model simulations of estuarine scenarios. The underlying method is based on a quantification of salinity mixing ... -
Effects of selected ligands on U (VI) immobilization by zerovalent iron
(Journal of radioanalytical and nuclear chemistry, 2006)The effect of Cl-, CO32-, EDTA, NO2-, NO3-, PO43-, SO42-, and humic substances (HS)on the U(VI)co-precipitation from aqueous solutions by zerovalent iron (ZVI) was investigated in the neutral pH range.Batch experiments ... -
Effects of Temperature and Light on Methane Production of Widespread Marine Phytoplankton
(Journal of Geophysical Research: Biogeosciences, 2020)Methane (CH4) production in the ocean surface mixed layer is a widespread but still largely unexplained phenomenon. In this context marine algae have recently been described as a possible source of CH4 in surface waters. ... -
Effects of the Hydrous Domain in the Mantle Wedge on Magma Formation and Mixing at the Northeast Lau Spreading Center, SW Pacific
(Geochemistry, Geophysics, Geosystems, 2022-03-07)Abundant volcanic activity occurs in the back‐arc region of the northern Tofua island arc where the Northeast Lau Spreading Center (NELSC) propagates southwards into older crust causing the formation of numerous seamounts ... -
Effect‐Based Trigger Values for Mixtures of Chemicals in Surface Water Detected with In Vitro Bioassays
(Environmental Toxicology and Chemistry, 2021-01-13)Effect‐based trigger (EBT) values for in vitro bioassays are important for surface water quality monitoring because they define the threshold between acceptable and poor water quality. They have been derived for highly ... -
Efficient Extraction of Past Seawater Pb and Nd Isotope Signatures From Southern Ocean Sediments
(Geochemistry, Geophysics, Geosystems, 2021-03-16)Radiogenic lead (Pb) and neodymium (Nd) isotope compositions extracted from authigenic phases in marine sediments are sensitive tracers to reconstruct past ocean circulation and water mass mixing. Chemical reductive leaching ... -
Ein temperaturabhängiges thermodynamisches Modell für das System H+ - NH_hn+4 - Na+ - SO2 -4 - NO-1hn3 - Cl- - H2O
(Univ. Köln, 2008)Atmosphärische Aerosolpartikel spielen eine bedeutende Rolle in verschiedenen Fragestellungen der Luftreinhaltung. Einen wesentlichen Bestandteil ihrer Masse bilden anorganische Komponenten wie Sulfat, Ammonium und Nitrat, ... -
Einschlüsse in Mineralen
(Deutscher Verlag für Grundstoffindustrie, Leipzig, 1987)Das erste deutschsprachige Buch zur Einschlußforschung gibt einen geschlossenen Überblick über Geschichte, physikochemische Grundlagen, Einzelmethoden und Anwendungsmöglichkeiten der Untersuchung von Einschlüssen in ... -
Eiskalte Kristalle: Geomaterial und Modellsubstanz
(Georgia Augusta, 2005) -
El Niño-Driven Oxygenation Impacts Peruvian Shelf Iron Supply to the South Pacific Ocean
(Geophysical Research Letters, 2020)Upwelling ocean currents associated with oxygen minimum zones (OMZs) supply nutrients fuelling intense marine productivity. Perturbations in the extent and intensity of OMZs are projected in the future, but it is currently ... -
Elastic stiffness coefficients of thiourea from thermal diffuse scattering
(Journal of Applied Crystallography, 2021-01-29)The complete elastic stiffness tensor of thiourea has been determined from thermal diffuse scattering (TDS) using high‐energy photons (100 keV). Comparison with earlier data confirms a very good agreement of the tensor ... -
Electrical conductivity of HCl-bearing aqueous fluids to 700 ºC and 1 GPa
(Contributions to Mineralogy and Petrology, 2020-11-18)Subsurface magmatic–hydrothermal systems are often associated with elevated electrical conductivities in the Earthʼs crust. To facilitate the interpretation of these data and to allow distinguishing between the effects of ... -
Electrochemical Properties of Peat Particulate Organic Matter on a Global Scale: Relation to Peat Chemistry and Degree of Decomposition
(Global Biogeochemical Cycles, 2022-02-16)Methane production in peatlands is controlled by the availability of electron acceptors for microbial respiration, including peat dissolved organic matter (DOM) and particulate organic matter (POM). Despite the much larger ... -
Elemental iron (Fe0) for better drinking water in rural areas of developing countries
(Springer, Berlin/Heidelberg2008)Many of the reasons behind the anthropogenic contamination problems in rural environments of developing countries lie in changes in the traditional way of life and the ignorance on the toxic potential of introduced ... -
Energy‐dispersive X‐ray stress analysis under geometric constraints: exploiting the material's inherent anisotropy
(Journal of Applied Crystallography, 2023-04-01)Two data evaluation concepts for X‐ray stress analysis based on energy‐dispersive diffraction on polycrystalline materials with cubic crystal structure, almost random crystallographic texture and strong single‐crystal ... -
Enhanced Late Miocene Chemical Weathering and Altered Precipitation Patterns in the Watersheds of the Bay of Bengal Recorded by Detrital Clay Radiogenic Isotopes
(Paleoceanography and Paleoclimatology, 2021-09-06)The late Miocene was a period of declining CO2 levels and extensive environmental changes, which likely had a large impact on monsoon strength as well as on the weathering and erosion intensity in the South Asian Monsoon ... -
Entwicklung mineralogischer Färbetechniken und ihre Anwendung auf spezifische Betonphasen zur Analyse der Zusammensetzung von zementgebundenen Baustoffen
(Univ. Halle (Saale), 2007)Ziel der Arbeit war die Entwicklung neuer Methoden zur Analyse der Rezeptur, des Gefüges und der Alterung von zementgebundenen Baustoffen. Dazu wurden mineralogische Färbemethoden so weiterentwickelt, dass sie auf Betonproben ...