Auflistung Geochemie, Mineralogie, Petrologie nach Titel
Anzeige der Dokumente 60-79 von 567
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Chemical Geodynamics Insights From a Machine Learning Approach
(Geochemistry, Geophysics, Geosystems, 2022-10-19)The radiogenic isotope heterogeneity of oceanic basalts is often assessed using 2D isotope ratio diagrams. But because the underlying data are at least six dimensional (87Sr/86Sr, 143Nd/144Nd, 176Hf/177Hf, and 208,207,20 ... -
Chemical Weathering of Loess and Its Contribution to Global Alkalinity Fluxes to the Coastal Zone During the Last Glacial Maximum, Mid-Holocene, and Present
(Geochemistry, Geophysics, Geosystems, 2020)Loess sediments are windblown silt deposits with, in general, a carbonate grain content of up to 30%. While regionally, loess was reported to increase weathering fluxes substantially, the influence on global weathering ... -
Classification of CM chondrite breccias—Implications for the evaluation of samples from the OSIRIS-REx and Hayabusa 2 missions
(Meteoritics & Planetary Science, 2020)CM chondrites are complex impact (mostly regolith) breccias, in which lithic clasts show various degrees of aqueous alteration. Here, we investigated the degree of alteration of individual clasts within 19 different CM ... -
Clay fraction properties and grassland management imprint on soil organic matter composition and stability at molecular level
(Soil Use and Management, 2022-05-07)The dynamics of soil carbon in grassland are partly determined by soil organic matter (SOM) composition. However, it remains unclear which role grassland management plays in the interplay between SOM composition and carbon ... -
Clay mineral formation in Permian rocks of a geothermal borehole at Northern Upper Rhine Graben, Germany
(International Journal of Earth Sciences, 2021-03-27)Hydrothermally altered rhyolite rocks in the Permian Donnersberg Formation of a geothermal borehole in the Northern Upper Rhine Graben (Germany) were investigated to find out answers for the low hydraulic conductivity of ... -
Collisional mixing between inner and outer solar system planetesimals inferred from the Nedagolla iron meteorite
(Meteoritics & Planetary Science, 2021-10-18)The ungrouped iron meteorite Nedagolla is the first meteorite with bulk Mo, Ru, and Ni isotopic compositions that are intermediate between those of the noncarbonaceous (NC) and carbonaceous (CC) meteorite reservoirs. The ... -
Combined X-ray and neutron single-crystal diffraction in diamond anvil cells
(Journal of Applied Crystallography, 2019)It is shown that it is possible to perform combined X-ray and neutron single-crystal studies in the same diamond anvil cell (DAC). A modified Merrill–Bassett DAC equipped with an inflatable membrane filled with He gas has ... -
Combining reverse Monte Carlo analysis of X‐ray scattering and extended X‐ray absorption fine structure spectra of very small nanoparticles
(Journal of Applied Crystallography, 2022-12-23)Finite size effects in partial pair distribution functions generate artefacts in the scattering structure factor and scattering intensity. It is shown how they can be overcome using a binned version of the Debye scattering ... -
Comments on "Comparison of reductive dechlorination of p-chlorophenol using Fe0 and nanosized Fe0 by R. Cheng, et al. [J. Hazard. Mater. 144 (2007) 334]
(Journal of hazardous materials, 2007) -
Comments on: "Sorption of triazoles to soil and iron minerals" by Y. Jia et al. [Chemosphere 67 (2007) 250258]
(Chemosphere, 2007)This letter suggests possible improvements on the discussion of the adsorptive removal of triazoles by iron minerals which are possible corrosion products of elemental iron materials (Fe0) in a recent article by Jia et al. ... -
Comments on: "The effect of substituent groups on the reductive degradation of azo dyes by zerovalent iron" by M. Hou, et al. [J. Hazard. Mater. 145 (2007) 305]
(Journal of hazardous materials, 2007)This letter discusses possible improvements in experimental conditions to enable a purposeful discussion on the effect of substituent groups on the reductive degradation of azo dyes by elemental iron (Fe0) in a recent ... -
Compaction control on diagenesis and reservoir quality development in red bed sandstones: a case study of Permian Rotliegend sandstones
(International Journal of Earth Sciences, 2021-04-22)Authigenic minerals formed during diagenesis in conjunction with compaction by burial have long been known to lead to porosity-loss of sandstones, and a subsequent deterioration in reservoir quality. The diagenetic impact ... -
Comparative Evaluation of Different MOF and Non‐MOF Porous Materials for SO2 Adsorption and Separation Showing the Importance of Small Pore Diameters for Low‐Pressure Uptake
(Advanced Sustainable Systems, 2021-02-11)The search for adsorbents for flue gas desulfurization processes is a current interest. For the first time, a comparative experimental study of SO2 adsorption by porous materials including the prototypical metal–organic ... -
Comparison and evaluation of pair distribution functions, using a similarity measure based on cross‐correlation functions
(Journal of Applied Crystallography, 2021-03-31)An approach for the comparison of pair distribution functions (PDFs) has been developed using a similarity measure based on cross‐correlation functions. The PDF is very sensitive to changes in the local structure, i.e. ... -
Comparison of In Situ and Ex Situ Equilibrium Passive Sampling for Measuring Freely Dissolved Concentrations of Parent and Alkylated Polycyclic Aromatic Hydrocarbons in Sediments
(Environmental Toxicology and Chemistry, 2020-09-22)Equilibrium passive sampling methods (EPSMs) allow quantification of freely dissolved contaminant concentrations (Cfree) in sediment porewater. Polydimethylsiloxane (PDMS) is a convenient sampling polymer that can be ... -
Compound-Specific Radiocarbon Analysis of (Sub-)Antarctic Coastal Marine Sediments—Potential and Challenges for Chronologies
(Paleoceanography and Paleoclimatology, 2020)In Antarctic and Subantarctic environments, 14C-based age determination is often challenging due to unknown reservoir effects, low organic carbon contents of sediments, and high contributions of petrogenic (14C-free) carbon ... -
Concepts for nondestructive and depth‐resolved X‐ray residual stress analysis in the near‐surface region of nearly single crystalline materials with mosaic structure
(Journal of Applied Crystallography, 2020-12-02)Two evaluation concepts for nondestructive depth‐resolved X‐ray residual stress analysis in the near‐surface region of materials with cubic symmetry and nearly single crystalline structure are introduced by simulated ... -
Consolidation of volcanic tuffs with TEOS and TMOS: a systematic study
(Environmental Earth Sciences, 2021-12-08)In this study, nine volcanic tuffs from Armenia, Germany and Mexico were treated with two commercially available consolidants on base of silicic acid ester, as well as different pretreatments with an anti-swelling agent ...