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Structure determination of organic compounds by a fit to the pair distribution function from scratch without prior indexing
(
- Journal of Applied Crystallography
, 2021-05-09)
A method for the ab initio crystal structure determination of organic compounds by a fit to the pair distribution function (PDF), without prior knowledge of lattice parameters and space group, has been developed. The method ...
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. ...
Shock-induced formation of wüstite and fayalite in a magnetite-quartz target rock
(
- Meteoritics & Planetary Science
, 2019)
Projectile–target interactions as a result of a large bolide impact are important issues, as abundant extraterrestrial material has been delivered to the Earth throughout its history. Here, we report results of shock-recovery ...
A new hydrate of magnesium carbonate, MgCO3·6H2O
(
- Acta Crystallographica Section C
, 2020)
During investigations of the formation of hydrated magnesium carbonates, a sample of the previously unknown magnesium carbonate hexahydrate (MgCO3·6H2O) was synthesized in an aqueous solution at 273.15 K. The crystal ...
Advances in understanding calcite varve formation: new insights from a dual lake monitoring approach in the southern Baltic lowlands
(
- Boreas
, 2021-02-09)
We revise the conceptual model of calcite varves and present, for the first time, a dual lake monitoring study in two alkaline lakes providing new insights into the seasonal sedimentation processes forming these varves. ...
Iron isotope fractionation in soil and graminaceous crops after 100 years of liming in the long‐term agricultural experimental site at Berlin‐Dahlem, Germany
(
- European Journal of Soil Science
, 2020-03-04)
Sustainable arable cropping relies on repeated liming. Yet, the associated increase in soil pH can reduce the availability of iron (Fe) to plants. We hypothesized that repeated liming, but not pedogenic processes such as ...
The anisotropy in the optical constants of quartz crystals for soft X‐rays
(
- Journal of Applied Crystallography
, 2021-02-19)
The refractive index of a y‐cut SiO2 crystal surface is reconstructed from orientation‐dependent soft X‐ray reflectometry measurements in the energy range from 45 to 620 eV. Owing to the anisotropy of the crystal structure ...
Synchronous Changes in Sediment Transport and Provenance at the Iceland-Faroe Ridge Linked to Millennial Climate Variability From 55 to 6 ka BP
(
- Geochemistry, Geophysics, Geosystems
, 2019)
Unique marine sediment cores retrieved from the southwestern slope of the Iceland-Faroe Ridge (IFR), close to the main axis of the Iceland-Scotland Overflow Water (ISOW), revealed prominent sedimentary cycles reflecting ...
Upscaling Net Ecosystem Exchange Over Heterogeneous Landscapes With Machine Learning
(
- Journal of Geophysical Research: Biogeosciences
, 2021-02-13)
This paper discusses different feature selection methods and CO2 flux data sets with a varying quality‐quantity balance for the application of a Random Forest model to predict daily CO2 fluxes at 250 m spatial resolution ...
Exhumation of ultrahigh-pressure metamorphic oceanic crust from Lago di Cignana, Piemontese zone, Western Alps
(Univ. Bochum, 1998)
Die Exhumierungsgeschichte der ultrahochdruckmetamorphen (UHPM) Gesteine am Lago di Cignana wurde rekonstruiert. Die Eklogite wurden unter UHPM Bedingungen (ca. 600 ʿC, 2,7 GPa) verformt. Bei Temperaturen (T) um 500 ʿC und ...