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Ptychographic X-ray speckle tracking
(
- Journal of Applied Crystallography
, 2020)
A method is presented for the measurement of the phase gradient of a wavefront by tracking the relative motion of speckles in projection holograms as a sample is scanned across the wavefront. By removing the need to obtain ...
Stable isotopes of water reveal differences in plant – soil water relationships across northern environments
(
- Hydrological Processes
, 2021-01-24)
We compared stable isotopes of water in plant stem (xylem) water and soil collected over a complete growing season from five well‐known long‐term study sites in northern/cold regions. These spanned a decreasing temperature ...
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 ...
Controls on Dissolved Silicon Isotopes Along the U.S. GEOTRACES Eastern Pacific Zonal Transect (GP16)
(
- Global Biogeochemical Cycles
, 2020)
The distribution of dissolved silicon isotopes (δ30Si) was examined along the U.S. GEOTRACES East Pacific Zonal Transect (GP16) extending from Peru to Tahiti (10°S and 15°S latitude). Surface waters in the subtropical gyre ...
Radiometric Temperature Measurements in Nongray Ferropericlase With Pressure- Spin- and Temperature-Dependent Optical Properties
(
- Journal of Geophysical Research: Solid Earth
, 2019)
Accurate temperature determination is central to measurements of physical and chemical properties in laser-heated (LH) diamond anvil cells (DACs). Because the optical properties of samples at high pressure-temperature (P-T) ...
Relativistic correction of atomic scattering factors for high-energy electron diffraction
(
- Acta Crystallographica Section A
, 2019)
Relativistic electron diffraction depends on linear and quadratic terms in the electric potential, the latter being neglected in the frequently used relativistically corrected Schrödinger equation. The quadratic electric ...
Limited angle tomography for transmission X-ray microscopy using deep learning
(
- Journal of Synchrotron Radiation
, 2020)
In transmission X-ray microscopy (TXM) systems, the rotation of a scanned sample might be restricted to a limited angular range to avoid collision with other system parts or high attenuation at certain tilting angles. Image ...
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 ...
The Synergy of Data From Profiling Floats, Machine Learning and Numerical Modeling: Case of the Black Sea Euphotic Zone
(
- Journal of Geophysical Research: Oceans
, 2022-08-24)
Data from profiling floats in the Black Sea revealed complex temporal and spatial relationships between physical variables and oxygen, chlorophyll and the backscattering coefficient at 700 nm, as well as some limits in ...
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 ...