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At least 865 records · Page 48
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Denudation, solute export, landscape evolution modeling, and geographic information system data for the East River watershed, Colorado, USA (2020-2024)

This data package contains geographic information system (GIS) layers and tabular datasets associated with the study of lithologic controls on denudation, solute export, carbon-scaling relationships, and transient landscape evolution in the East River watershed near Crested Butte, Colorado, USA. The package includes GIS layers used to produce the Figure 2 map, including drainage, hillshade, lithology, sample locations, and basin polygons, together with comma-separated value (CSV) tables and matching CSV data dictionaries. One group of tables reports sample-level and catchment-level information for river-sediment samples analyzed for in situ-produced cosmogenic beryllium-10 (10Be), including sample names, outlet elevations, geographic coordinates, upstream drainage area, rock-type classes, production-rate scaling scheme, analyzed nuclide, catchment-averaged denudation rates, and associated lower and upper analytical uncertainties. Sample and catchment attributes provide the basis for comparing denudation rates across intrusive, shale, sedimentary, and mixed-lithology settings. A second group of tables reports supporting information for landscape-evolution modeling and the mapped geologic framework of the study area. Included files list parameter values and definitions for the two-phase landscape-evolution simulations, summarize full-domain model erosion fluxes and topographic metrics for different simulation configurations, provide a fixed-area carbon-model scaling table, and summarize mapped geologic units within the East River study domain, including geologic code, formation name, lithologic description, mapped area, and lithologic class grouping. Model outputs and geologic summaries support interpretation of transient landscape behavior and its relation to the mapped distribution of shale, intrusive, sedimentary, and surficial units. A third group of tables reports hydrologic and hydrochemical information used to quantify dissolved export from the watershed. Included files provide site-level values for drainage area, mean annual solute export, standard error of annual export, area-normalized solute yield, and equivalent weathering rate for five East River monitoring sites, along with metadata describing the number, sampling cadence, and date range of discharge records and partial and full total dissolved solids observations used in the solute-yield analyses. The package also contains a supplementary daily ion-load time series with daily mean discharge, discharge observation counts, dissolved concentrations, and daily loads for calcium, magnesium, sodium, potassium, chloride, sulfate, nitrate, fluoride, dissolved silica, charge-balance bicarbonate, and total dissolved solids. The package contains GIS files, comma-separated value files (.csv), CSV data dictionaries, a file-level metadata table, a package-tree text file, and a readme text file.

10Be↗
DOE OSTI2026

Stream Chemistry, Synoptic Surveys, East Fork Poplar Creek Watershed, TN, USA; April 2023 to February 2025

Impacts of developed land cover on stream chemistry can be difficult to discern from natural variability, particularly in carbonate watersheds where weathering of urban infrastructure and lithology generate similar signatures. We evaluated how spatial patterns of stream chemistry varied across perennial and non-perennial tributaries spanning an urban-to-forested gradient in a mid-order, carbonate-dominated watershed. This data package contains a processed and compiled summary of stream chemistry and properties obtained from 12 synoptic surveys of 54 stream sites across the East Fork Poplar Creek watershed located near Oak Ridge, TN, United States. The sites include non-perennial tributaries, perennial tributaries, and the main stem and span forested to urban (highly developed) land cover gradients. The data package includes the processed and flagged chemical data (WaDE_SynopticSummary_FinalChemistry), metadata describing data flagging and analysis (WaDE_SynopticSummary_Metadata), information about each site and its contributing subcatchment (WaDE_SynopticSummary_SiteInformation), and a comparison of instrument and field detection limits used to determine method detection limits for the study (WaDE_SynopticSummary_DetectionLimitComparison). Stream chemistry includes stream parameters measured in situ using multiparameter probes (dissolved oxygen, pH, specific conductance, temperature) and solutes including nutrients (nitrate, ammonium, soluble reactive phosphorus), dissolved organic carbon, dissolved inorganic carbon, major cations (calcium, magnesium, potassium, sodium), major anions (chloride, sulfate), and a broad suite of minor and trace elements.

EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE ↗
DOE OSTI2020

High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

Calcium–magnesium–alumino-silicate (CMAS) particulates enter the aero-engine in a sandy environment, melt and infiltrate into 7 wt% yttria-stabilized zirconia (7YSZ) thermal barrier coatings (TBCs), reducing their lifetime. This leads to chemical degradation in 7YSZ accompanied by tetragonal to monoclinic phase transformation upon cooling. In this work, electron-beam physical vapor deposition coatings were infiltrated with a synthetic CMAS. Here, synchrotron X-ray diffraction measurements show that CMAS infiltration at 1250 °C has about 43% higher monoclinic phase volume fraction (PVF) at the coating surface compared to 1225 °C and remains consistently higher throughout the coating depth. Additionally, the increase in annealing time from 1 to 10 h results in a 31% higher monoclinic phase at the surface. Scanning electron microscopy revealed the presence of globular monoclinic phases corresponding spatially with the above findings. These results resolve the impact of time and temperature on CMAS infiltration kinetics which is important for mitigation.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Biomineral mesostructure

Abstract Biominerals formed by animals are most frequently calcium carbonate or phosphate polycrystalline materials with complex hierarchical structures. This article will focus on the 10-nm–10-µm scale, termed “mesoscale,” at which the “mesostructure” differs greatly across biominerals, is relevant to their mechanical properties, and reveals formation mechanisms in sea urchin teeth, mollusk shell prisms and nacre, human enamel, and coral skeletons. This article will conclude by focusing on important unanswered questions to inspire future research. Graphical abstract

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LuB6 by Materials Project

LuB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Lu is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Lu–B bond lengths are 2.99 Å. B is bonded in a 1-coordinate geometry to four equivalent Lu and five equivalent B atoms. There is one shorter (1.62 Å) and four longer (1.74 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KB6 by Materials Project

KB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. K is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All K–B bond lengths are 3.10 Å. B is bonded in a 1-coordinate geometry to four equivalent K and five equivalent B atoms. There is one shorter (1.68 Å) and four longer (1.80 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrB6 by Materials Project

PrB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pr is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Pr–B bond lengths are 3.05 Å. B is bonded in a 1-coordinate geometry to four equivalent Pr and five equivalent B atoms. There is one shorter (1.66 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TbB6 by Materials Project

TbB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tb is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Tb–B bond lengths are 3.01 Å. B is bonded in a 1-coordinate geometry to four equivalent Tb and five equivalent B atoms. There is one shorter (1.63 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ErB6 by Materials Project

ErB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Er is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Er–B bond lengths are 3.00 Å. B is bonded in a 1-coordinate geometry to four equivalent Er and five equivalent B atoms. There is one shorter (1.62 Å) and four longer (1.74 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ThB6 by Materials Project

ThB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Th is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Th–B bond lengths are 3.02 Å. B is bonded in a 1-coordinate geometry to four equivalent Th and five equivalent B atoms. There is one shorter (1.62 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdB6 by Materials Project

NdB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Nd is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Nd–B bond lengths are 3.04 Å. B is bonded in a 1-coordinate geometry to four equivalent Nd and five equivalent B atoms. There is one shorter (1.65 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuB6 by Materials Project

EuB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Eu–B bond lengths are 3.07 Å. B is bonded in a 1-coordinate geometry to four equivalent Eu and five equivalent B atoms. There is one shorter (1.68 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeB6 by Materials Project

CeB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ce is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Ce–B bond lengths are 3.02 Å. B is bonded in a 1-coordinate geometry to four equivalent Ce and five equivalent B atoms. There is one shorter (1.63 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YB6 by Materials Project

YB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Y is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Y–B bond lengths are 3.01 Å. B is bonded in a 1-coordinate geometry to four equivalent Y and five equivalent B atoms. There is one shorter (1.63 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdB6 by Materials Project

GdB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Gd–B bond lengths are 3.02 Å. B is bonded in a 1-coordinate geometry to four equivalent Gd and five equivalent B atoms. There is one shorter (1.64 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrB6 by Materials Project

SrB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sr is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Sr–B bond lengths are 3.09 Å. B is bonded in a 1-coordinate geometry to four equivalent Sr and five equivalent B atoms. There is one shorter (1.71 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaB6 by Materials Project

LaB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. La is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All La–B bond lengths are 3.05 Å. B is bonded in a 1-coordinate geometry to four equivalent La and five equivalent B atoms. There is one shorter (1.66 Å) and four longer (1.77 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YbB6 by Materials Project

YbB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Yb is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Yb–B bond lengths are 3.04 Å. B is bonded in a 1-coordinate geometry to four equivalent Yb and five equivalent B atoms. There is one shorter (1.66 Å) and four longer (1.74 Å) B–B bond length.

36 MATERIALS SCIENCE↗