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Journal of Research of the National Institute of Standards and Technology articles

1,025 total articles

Journal containing information on metrology in physics, chemistry, engineering, and computer sciences.

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Journal of Research of the National Institute of Standards and Technology back issues

Recent articles from Journal of Research of the National Institute of Standards and Technology

Reflective optical chopper used in NIST high-power laser measurements.
November 1, 2008... For the past ten years, NIST has used high-reflectivity, optical choppers as beamsplitters and attenuators when calibrating the absolute responsivity and response linearity of detectors used with high-power CW lasers. The chopper-based technique has several advantages over the use of...

Properties of calcium phosphate cements with different tetracalcium phosphate and dicalcium phosphate anhydrous molar ratios.
November 1, 2008... Calcium phosphate cements (CPCs) were prepared using mixtures of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA), with TTCP/DCPA molar ratios of 1/1, 1/2, or 1/3, with the powder and water as the liquid. Diametral tensile strength (DTS), porosity, and phase composition...

Workshop on measurement needs for local-structure determination in inorganic materials.
November 1, 2008... The functional responses (e.g., dielectric, magnetic, catalytic, etc.) of many industrially-relevant materials are controlled by their local structure--a term that refers to the atomic arrangements on a scale ranging from atomic (sub-nanometer) to several nanometers. Thus, accurate knowledge...

A low-cost fiducial reference phantom for computed tomography.
November 1, 2008... To detect the growth in lesions, it is necessary to ensure that the apparent changes in size are above the noise floor of the system. By introducing a fiducial reference, it may be possible to detect smaller changes in lesion size more reliably. We suspend three precision spheres with a...

Revised standardized equation for hydrogen gas densities for fuel consumption applications.
November 1, 2008... An equation for the density of hydrogen gas has been developed that agrees with the current standard to within 0.01 % from 220 K to 1000 K with pressures up to 70 MPa, to within 0.01 % from 255 K to 1000 K with pressures to 120 MPa, and to within 0.1 % from 200 K to 1000 K up to 200 MPa. The...

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