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2841 results found

Sampling-Agnostic Software Framework for Converting Between Texture Map Representations of Virtual Environments

Data provided by  National Institute of Standards and Technology

We have developed a utility to both stitch cube maps into other types of texture maps (equirectangular, dual paraboloid, and octahedral), and stitch those other types back into cube maps. The utility allows for flexibility in the image size of the conversion - the user can specify the desired image width, and the height is computed (cube, paraboloid, and octahedral mappings are square, and spherical maps are generated to have 16:9 aspect ratio).

Tags: equirectangular; octahedral; paraboloid; projection; sampling; texture map; transformation,

Modified: 2025-04-06

SRM 918c Potassium Chloride General and Ion Activity Standard

Data provided by  National Institute of Standards and Technology

This Standard Reference Material (SRM) is intended for use as an analytical standard of known purity. It is intended primarily for use in the calibration and standardization of procedures for potassium (K) and chloride (Cl-) determinations employed in clinical analysis, including those using ion-selective electrodes, and for routine critical evaluation of the daily working standards used in these procedures. This lot of potassium chloride (KCl) was prepared to ensure a material of high purity and homogeneity and has been assayed after heating at 110 degrees C to 120 degrees C.

Tags: SRM,Standard Reference Material,potassium chloride,

Modified: 2025-04-06

Full Statistical Mode Reconstruction of a light field

Data provided by  National Institute of Standards and Technology

The mode structure fully describes a light field and contains the information about the source of light without a direct access to the source. Here we offer the tool to extract this information from the measured photon number resolved (PNR) distribution. We present a software package aimed at simulating photon-number probability distributions of a range of naturally occurring classical and non-classical states of light. This software can generate arbitrary probability distributions based on the known mode structure of a light field. It also can solve the reverse problem, i.e.

Tags: photon-number resolved detection,quantum optics,parametric down-conversion,four-wave mixing,optical modes,nonclassicality,mesoscopic states,thermal statistics,poisson statistics,binomial statistics,

Modified: 2025-04-06

Probabilistic distribution of dissolution rate constants for cubic tricalcium aluminate in water

Data provided by  National Institute of Standards and Technology

The probabilistic distribution of dissolution rate constants for cubic tricalcium aluminate (C3A) in water was quantified based on in-situ measurements of the changes in the nanoscale surface topography using reflection digital holographic microscopy. Measurements were performed on polished sintered pellets of C3A from two sources. C3A#1 consists of 94.2 % crystalline C3A-c, 2.0 % free CaO, and 3.8 % amorphous content. C3A#2 consists of 84.3 % crystalline C3A-c, 1.0 % free CaO, 4.6 % mayenite, and 10.1 % amorphous content.

Tags: tricalcium aluminate,dissolution,kinetics,rate constant,portland cement,

Modified: 2025-04-06

Effect of Heterogeneity and Shape on Optical Properties of Urban Dust Based on 3-Dimensional Modeling of Individual Particles

Data provided by  National Institute of Standards and Technology

This project involves the analysis and modeling of individual urban atmospheric dust particles using scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX), focused ion-beam (FIB) tomography, 3-D reconstructions of the particles, and the discrete dipole approximation method for calculating particle optical properties. The particles are heterogeneous in that they have multiple chemical phases.

Tags: atmospheric aerosol,urban dust,light scattering,discrete dipole approximation,focused ion-beam scanning electron microscopy,FIB-SEM,FIB tomography,energy dispersive x-ray spectroscopy,

Modified: 2025-04-06

NanoUV-VIS- An interactive visualization tool for monitoring the evolution of optical properties of nanoparticles throughout synthesis reactions.

Data provided by  National Institute of Standards and Technology

Shiny app for monitoring the evolution of optical properties of nanoparticles throughout synthesis reactions.

Tags: Advanced Functional Materials,Advanced Materials,

Modified: 2025-04-06

CORR-DATA

Data provided by  National Institute of Standards and Technology

Corrosion is defined as the deterioration of a material due to chemical reactions with its environment. Understanding corrosion, and corrosion rates, is necessary to ensure that the design of objects we interact with every day, from the bridges we drive over to the containers used to transport chemicals, from the pipes that carry our water to the utensils we cook with, are safe and perform to specifications.

Tags: corrosion,NACE,

Modified: 2025-04-06

Results from double-shear tests of high-strength structural bolts at elevated temperatures

Data provided by  National Institute of Standards and Technology

Abstract: The behavior of high-strength structural steel at elevated temperatures, especially under shear loading, is not well established in the literature. Set of data presents results from recently conducted tests on high-strength structural bolts subject to double shear loading at elevated temperatures. The parameters varied between tests included the bolt grade, bolt diameter, and temperature. Bolt grades A325 and A490 were tested.

Tags: Elevated-temperature; High-strength structural bolts; Shear loading,Structural fire effects,

Modified: 2025-04-06

Certified values of iodine in CRMs of food matrices in mg/kg units. The uncertainties are expanded uncertainties at approximately 95% confidence.

Data provided by  National Institute of Standards and Technology

A comparison of the expanded uncertainty for certified values of iodine in food matrix CRMs. The CRMS were found by searching The European Virtual Institute for Speciation Analysis (EVISA) database using the terms "Iodine" and "Certified" in the Material category. The uncertainties are expanded uncertainties at approximately 95% confidence.

Tags: food,nutrition,dietary supplements,Standard Reference materials,reference materials,SRM,RM,Food and Nutrition,

Modified: 2025-04-06

Measurement of the Behavior of Steel Beams under Localized Fire Exposure

Data provided by  National Institute of Standards and Technology

A total of nine localized fire tests on steel beams were designed and conducted in the National Fire Research Laboratory as part of its commissioning project, including thermal tests (Tests 1 through 5) and four-point bending test at ambient (Test 6) and elevated temperatures (Tests 7 through 9). All the tested specimens were nominally 6.2-m long W16×26 beams made of ASTM A992 steel. Each specimen was supported by one of the two following connections: (i) simple support (Tests 1 through 8), and (ii) double-angles bolted to laterally braced support columns (Test 9).

Tags: steel beam; localized fire; thermal and mechanical behavior; experimental test,

Modified: 2025-04-06