X-ray computed tomography (XCT) datasets with known ground truth pores were developed using realistic XCT simulation. Non-overlapping spherical pores of varying sizes are randomly distributed in a cylindrical part near surfaces and within the core. Ground truth data, ground truth binary data, normalized projection, and reconstructed data for three different signal-to-noise ratios (SNRs) are provided. The data set can be used for evaluation and comparison of image segmentation/detection and reconstruction algorithms.

This data set is for the figures in the paper titled, "Improved Broadband Antenna Gain Measurements Through Multipath Mitigation Using Combined Robot Motion Stirring". In this paper we describe a technique that uses coordinated motion of two robotic antenna positioners to mitigate the influence of chamber multipath reflections during antenna gain measurements. This technique demonstrates a new application that leverages the capability of modern robotic antenna ranges to accurately position pairs of antennas relative to an anechoic chamber over a wide range of poses.

Atom probe tomography is an emergent materials characterization technique with the potential to impact many advanced technology applications. NIST is supporting efforts to develop a robust understanding of the atom probe instrument performance and to advance standards that meet the needs and concerns of relevant stakeholders.
Data Type Description: *.csv.

This record contains example supporting documents and data for "Extreme size and irradiance dependence in high-resolution vat photopolymerization of hydrogels" available online at https://doi.org/10.1002/smtd.202502336.

In the main .zip file, there are three subfolders and one python script.

This repository provided code for NIST Low-Cost Environmental Sensing System stations, used for the real-time measurement of CO2 and meteorological parameters in the Washington, D.C. region. A wiki with additional information on system construction and operations is also included so others may continue utilizing and innovating this custom solution.

This software repository is a monitor for synchronization between resources under development by the W3C Data Shapes Working Group (Data Shapes WG).

This dataset contains the source code for modeling crack formation caused by the expansion
internal phases, driven by deterioration mechanisms such as pyrrhotite
oxidation or Alkali Silica Reaction (ASR) in concrete. It also includes simulation results and the
necessary input files for the various Fortran components. A comprehensive
description is available in the NIST IR: Quasistatic Crack Formation in Multiphase
Materials Driven by Internal Phases Expansion Mechanisms: Application to

FiPy is an object oriented, partial differential equation (PDE) solver, written in Python, based on a standard finite volume (FV) approach. The framework has been developed in the Materials Science and Engineering Division and Center for Theoretical and Computational Materials Science (CTCMS), in the Material Measurement Laboratory (MML) at the National Institute of Standards and Technology (NIST).

This includes the code for the ThreeBodyTB.jl project as well as a set of Quantum Espresso density functional theory calculations used to fit the tight binding coefficients.

This data contains X-ray computed tomography (XCT) reconstructed slices of additively manufactured cobalt chrome samples produced with varying laser powder bed fusion (LPBF) processing parameters (scan speed and hatch spacing). A constant laser power of 195 W and a layer thickness of 20 µm were used. Unoptimized processing parameters created defects in these parts. The as-built CoCr disks were 40 mm in diameter and 10 mm in height, with no post-processing step (e.g. heat treatment or hot isostatic pressing) used.