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Apparatus for determination of pressure-density-temperature relations and specific heats of hydrogen to 350 atmospheres at temperatures above 14Â°K.
hydrogen, physical properties, specific heat, PVT, pressure, density, temperature, apparatus
Method and apparatus are designed for more rapid determination of accurate, closely-spaced, PVT and specific heat data than realized by previous procedures. A sequence of pressure-temperature observations at nearly constant density is made by a...
Journal of Research of NIST and Predecessor Publications

Massic activity ratios of the NBS/NIST tritiated-water standards issued between 1954 and 1999
hydrogen-3; massic activity; NBS; NIST; standards; tritiated water; tritium
As part of the preparation and calibration of three new National Institute of Standards and Technology (NIST) tritiated-water radioactivity Standard Reference Materials (SRMs), the massic-activity (activity of the sample divided by the mass of the...
Journal of Research of NIST and Predecessor Publications

Influence of impurities on the pyrolysis of polyamides
hydrolytic; influence; impurities; polyamides; pyrolysis
A study has been made of the effect of drying and purification of polycaprolactam (nylon-6) on its thermal decomposition. The conclusions drawn from previous work, that a hydrolytic mechanism is at least partially operating due to the presence of...
Journal of Research of NIST and Predecessor Publications

The second virial coefficient for the realistic pair potential
Hypergeometric series; London interaction; pair potential function; realistic potential; second virial coefficient; spherical potential
An analytical formulation for the second virial coefficient is given for a spherically symmetric potential function of a simple form which has been called a realistic pair potential. This potential, given as an inverse relationship with r as a...
Journal of Research of NIST and Predecessor Publications

Reference Data Set of Human Skin Reflectance
hyperspectral; medical; reflectance; remote, sensing; skin; spectral; tissue.
(dataset)
Journal of Research of NIST and Predecessor Publications

Stiffening of the Extrapulmonary Arteries From Rats in Chronic Hypoxic Pulmonary Hypertension
hypoxia; pulmonary hypertension; rat model; stress; stretch; stiffening
Changes in the compliance properties of large blood vessels are critical determinants of ventricular afterload and ultimately dysfunction. Little is known of the mechanical properties of large vessels exhibiting pulmonary hypertension, particularly...
Journal of Research of NIST and Predecessor Publications

Report on Pairing-based Cryptography
IBE; identity-based encryption; pairing-based cryptography; pairings.
This report summarizes study results on pairing-based cryptography. The main purpose of the study is to form NIST's position on standardizing and recommending pairing-based cryptography schemes currently published in research literature and...
Journal of Research of NIST and Predecessor Publications

The normalized reduced form and cell mathematical tools for lattice analysis - Symmetry and similarity
identification; lattice-matching strategies; lattice relationships; lattice similarity; metric lattice; normalized reduced cell and form; symmetry
To intelligently and effectively use crystallographic databases, mathematical and computer tools are required that can elucidate diverse types of intra- and interlattice relationships. Two such tools are the normalized reduced form and normalized...
Journal of Research of NIST and Predecessor Publications

Trilateral intercomparison of photometric units maintained at NIST (USA), NPL (UK), and PTB (Germany)
illuminance; intercomparison; luminous flux; luminous intensity; luminous responsivity; photometer, photometry; units
A trilateral intercomparison of photometric units between NIST (USA), NPL (UK), and PTB (Germany) has been conducted to update the knowledge of the relationship between the photometric units disseminated in the three countries. The luminous...
Journal of Research of NIST and Predecessor Publications

Mossbauer imaging
image reconstruction; imaging; Mossbauer effect; Mossbauer imaging; Mossbauer tomography; tomographic image reconstruction; tomography.
In a Mossbauer experiment, if a spatially-extended absorbing sample is rotated relative to a moving gamma-ray source, lines of constant gamma-ray Doppler shift are generated through the absorber parallel to the motion of the source. As a result,...
Journal of Research of NIST and Predecessor Publications

An iterative image registration algorithm by optimizing similarity measurement
image registration; Newton-Raphson iteration; rigid body transformation; similarity measurement, standard casing
A new registration algorithm based on Newton-Raphson iteration is proposed to align images with rigid body transformation. A set of transformation parameters consisting of translation in x and y and rotation angle around z is calculated by...
Journal of Research of NIST and Predecessor Publications

Measurement tools for the immersive visualization environment: Steps toward the virtual laboratory
immersive visualization; measurement; tissue engineering; virtual laboratory; virtual reality
This paper describes a set of tools for performing measurements of objects in a virtual reality based immersive visualization environment. These tools enable the use of the immersive environment as an instrument for extracting quantitative...
Journal of Research of NIST and Predecessor Publications

The system NaCl-AlCl3
Immiscibility; NaAlCl4; phase equilibrium; system AlCl3-NaCl; system NaCl-AlCl3
The system NaCl-AlCl3 has been restudied by DTA, visual observation, and x-ray diffraction powder techniques for identification of crystalline phases. It was confirmed that the system contains one intermediate compound NaAlCl4 with an incongruent...
Journal of Research of NIST and Predecessor Publications

Some applications for series impedance elements in radio frequency immittance measurements
Immittance measurement; radio frequency; series elements; two-port standards
A series impedance element equipped with coaxial connectors may be evaluated as a two-port network. Precision connectors greatly reduce the uncertainties associated with the series connection, making practical several measurement techniques which...
Journal of Research of NIST and Predecessor Publications

Intrinsic capacitances and inductances of quantum Hall effect devices
impedance standard; internal capacitance; intrinsic impedance; kinetic inductance; magnetic inductance; quantum Hail effect; two-dimensional electron gas
Analytic solutions are obtained for the internal capacitances, kinetic inductances, and magnetic inductances of quantum Hall effect devices to investigate whether or not the quantized Hall resistance is the only intrinsic impedance of importance in...
Journal of Research of NIST and Predecessor Publications

Selecting nonlinear transformations for the evaluation of improper integrals
Improper integral, nonlinear transformation
Recent literature concerning the use of nonlinear transformations to evaluate numerically certain improper integrals of the first kind involves the determination of a transformation function g to improve the approximation. By approximating a given...
Journal of Research of NIST and Predecessor Publications

A note on the G-transformation
Improper integrals; nonlinear transformations
Recent literature concerning the use of nonlinear transformations to evaluate numerically certain improper integrals of the first kind has shown that difficulties are encountered if the integrand f is such that [Equation not included]. This note...
Journal of Research of NIST and Predecessor Publications

Magnetic rotation in the A=80 region: M1 bands in heavy Rb isotopes
in-beam gamma-spectroscopy; magnetic dipole bands; tilted-axis cranking model
We have studied the isotopes Rb-82(45), Rb-83(46), and Rb-84(47) to search for magnetic rotation which is predicted in the tilted-axis cranking model for a certain mass region around A = 80. Excited states in these nuclei were populated via the...
Journal of Research of NIST and Predecessor Publications

Immersion Coefficient for the Marine Optical Buoy (MOBY) Radiance Collectors
in-water, radiometry; Marine, Optical, Buoy; ocean, color; radiance, immersion, coefficient; system, vicarious, calibration.
The immersion coefficient accounts for the difference in responsivity for a radiometer placed in the air versus water or another medium. In this study, the immersion coefficients for the radiance collectors on the Marine Optical Buoy (MOBY) were...
Journal of Research of NIST and Predecessor Publications

Total hemispherical emittance of coated and uncoated Inconel and types 321 and 430 stainless steel
Inconel, stainless steel, hemispherical emittance, oxidized specimens, polished specimens
The total hemispherical emittance of specimens of three alloys, Inconel and types 321 and 430 stainless steel, in six different surface conditions, was evaluated at temperatures in the range 200 to 1,000 °C by a modification of the hot filament...
Journal of Research of NIST and Predecessor Publications

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