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Comparison of solid density standards between IMGC and NBS
density standards; hydrostatic weighing; international comparison; International System of Units; silicon; volume standards.
Solid-object density standards developed independently by the Istituto di Metrologia "G. Colonnetti" (IMGC) and NBS, and traceable to SI units of length and mass, have been compared using a silicon transfer standard. Results agree to approximately...
Journal of Research of NIST and Predecessor Publications

Solubility of CaHPO4 2H2O in the system Ca(OH)2-H3PO4-H2O at 5, 15, 25, and 37.5 C
Calcium phosphate; dicalcium phosphate dihydrate; ion pairs; solubility; solubility isotherms; solubility product
Solubility isotherms for CaHPO4 2H2O, dicalcium phosphate dihydrate, DCPD, in the ternary system Ca(OH)2 - H3PO4 - H2O were determined at 5, 15, 25, and 37.5 C in the pH range 3.5-7; the relative positions of the isotherms indicate that DCPD has a...
Journal of Research of NIST and Predecessor Publications

Solubility of -Ca3(PO4)2 in the system Ca(OH)2-H3PO4-H2O at 5, 15, 25, and 37 C
Beta-trica1cium phosphate, preparation; solubility, solubility product, stoichiometry of; dissolution, thermodynamics of; ion pairs; singular points; solubility isotherms; thermal coefficient of solubility
Solubility isotherms of beta-tricalcium phosphate, -Ca3(PO4)2, prepared by heating mixtures of CaCO3 and CaHPO4 above 800 C, were determined in the ternary system Ca(OH)2-H3PO4-H2O at 5, 15, 25, and 37 C in the pH range 6.0-7.5 by equilibration...
Journal of Research of NIST and Predecessor Publications

Solubility of Ca5(PO4)3OH in the system Ca(OH)2-H3PO4-H2O at 5-degrees-C, 15-degrees-C, 25-degrees-C and 37-degrees-C
Dissolution; hydroxyapatite; ion pairs; solubility; solubility isotherms; solubility product; thermal coefficient of solubility; thermodynamics; tooth mineral
Solubility isotherms of hydroxyapatite, Ca5(PO4)3OH (OHAp), prepared by titrating a boiling aqueous suspension of Ca(OH)2, with 0.5 M H3PO4, were determined in the ternary system Ca(OH)2-H3PO4-H20 at 5, 15, 25, and 37C in the pH range 3.7-6.7 by...
Journal of Research of NIST and Predecessor Publications

Solubility of CaHPO4 2H2O in the quaternary system Ca(OH)2-H3PO4-NaCl-H2O at 25 C
Brushite; CaHPO4 2H2O; NaHPO-4 ion pair; solubility product; system Ca(OH)2-H3PO4-H2O-NaCl
Solubility of CaHPO4 2H2O was determined in the quaternary system Ca(OH)2-H3PO4-NaCI-H2O at 25 C in the pH range 4.39-6.38; ionic strengths of the saturated solutions varied from 0.00485 to 0.545, Satisfactory constancy in the solubility produc t,...
Journal of Research of NIST and Predecessor Publications

The cylinder problem in thermoviscoelasticity
Cylinder; Neumann series; thermoviscoelasticity
Solutions are obtained for several axially symmetric plane strain problems involving a hollow circular viscoelastic cylinder. The cylinder is assumed to be subject to planar, axially symmetric body force and temperature fields. Displacement,...
Journal of Research of NIST and Predecessor Publications

Some solutions for electromagnetic problems involving spheroidal, spherical, and cylindrical bodies
Cylindrical bodies; electromagnetic problems; spherical bodies; spheroidal bodies
Solutions are presented for t he low-frequency electromagnetic response to an oscillating magnetic dipole by conducting bodies of simple shape. The quasi-stationary approximation is employed throughout, which is valid when the relevant dimensions...
Journal of Research of NIST and Predecessor Publications

A preliminary study of the fluid mechanics of liquid penetrant testing
Defect geometry; fluid elasticity; liquid penetrant testing; Rideal-Washburn equation; surface tension.
Some aspects of the fluid mechanics of liquid penetrant testing are considered. Penetration is represented by surface tension driven flow into defects of small defect width to depth ratio. Defect width is chosen so that both gravitational and...
Journal of Research of NIST and Predecessor Publications

Selecting Valid Correlation Areas for Automated Bullet Identification System Based on Striation Detection
edge detection; firearms identification; morphology; topography; striation mark.
Some automated bullet identification systems calculate a correlation score between two land impressions to measure their similarity. When extracting a compressed profile from the land impression of a fired bullet, inclusion of areas that do not...
Journal of Research of NIST and Predecessor Publications

World Wide Web for crystallography
conference; crystallography; distance teaching; e-mail; publishing; Virtual Library; World Wide Web
Some characteristics of the World Wide Web (WWW) and its Virtual Library (W3VL) are described. Aspects of the setting up, maintenance, future development and objectives of the World Wide Web Virtual Library: Crystallography are detailed. An...
Journal of Research of NIST and Predecessor Publications

Transport coefficients in the one-fluid approximation
Critical point; mixture; one-fluid theory; plait point; thermal conductivity coefficient; viscosity coefficient
Some comments of the justification of writing the viscosity and thermal conductivity coefficients of a mixture in the one-fluid approximation are presented. Anomalous behavior in the critical region is discussed.
Journal of Research of NIST and Predecessor Publications

Synthesis of cerite
Ca, Mg phosphate; hydrothermal synthesis; inorganic synthesis; mineral chemistry; rare-earth silicate; x-ray powder analysis
Some compounds isostructural with cerite have been synthesized hydrothermally at temperatures from 500 to 720 C. The compositional range for cerite, and its phase relation to the silicate apatites are established in terms of ionic radii of...
Journal of Research of NIST and Predecessor Publications

Improved ten-picofarad fused silica dielectric capacitor
Some defects in a set of fused silica dielectric capacitors constructed in 1961 are listed, and methods for their reduction or elimination are described. The construction of a new set of capacitors completed in 1964 is described in detail....
Journal of Research of NIST and Predecessor Publications

Static pressure measurements of enclosure fires
Buoyancy pressure; enclosure fires; entrainment; fire induced flows; models; physical scale; plumes
Some enclosure-fire static pressure measurements are presented for both full and scale model rooms and are compared with the present hydraulics-orifice flow model for fire induced flows into and out of enclosures. Results indicate that the vertical...
Journal of Research of NIST and Predecessor Publications

Nuclear structure - The future with radioactive beams
neutron-proton pairing; nuclear structure; radioactive beams
Some examples of new phenomena expected at extreme Values of neutron and proton number are discussed, including soft dipole modes and neutron-proton pairing. First results on the N = Z nucleus Ga-62 are presented in the context of the competition...
Journal of Research of NIST and Predecessor Publications

Domains of attraction of multivariate extreme-value distributions
asymptotic joint distribution; dependence function; multivariate extreme statistics
Some necessary and sufficient conditions for domains of attraction of multivariate extreme value distributions are shown by using dependence functions. The joint asymptotic distribution of multivariate extreme statistics is also shown.
Journal of Research of NIST and Predecessor Publications

Techniques for comparing four-terminal-pair admittance standards
AC direct-reading ratio set; ac measurements; bridge; coaxial chokes; defining transformers; equal power bridge; four-pair standards; frequency-dependent bridge; quadrature bridge
Some of the advantages of four-pair admittance standards and some of the special problems encountered in their measurement are pointed out. Detailed descriptions of three distinct types of four-pair bridges and some of their limitations are...
Journal of Research of NIST and Predecessor Publications

Calibration of a spectrophotometer for the measurement of color and the identification of compounds by spectral absorption curves in the ultraviolet, visible, and infrared regions of the spectrum
Photographs; History; Metrology; Colorimetry; 1950s; Laboratories
Some of the hundreds of color standards used by U.S. industry and various branches of the U.S. government are displayed in the background, including A-N Aircraft Camouflage, A-N Aircraft Standard, and U.S. Army Specification 3-1 color partially...
Historic Images

Automatic computing methods for special functions
Approximations; computer programs; computing pitfalls; continued fractions; error functi on; recurrence relations; series
Some of the pitfalls of automatic computation are described as well as their possible avoidance. A detailed description is given of the methods for computing the error and complementary error function. The implementation or the method is given in a...
Journal of Research of NIST and Predecessor Publications

Vapor pressure equation for water in the range 0 to 100 C
Clausius-Clapeyron equation; saturation vapor pressure over water; vapor pressure; vapor pressure of water; water vapor; steam; virial coefficients
Some precise measurements of the vapor pressure of liquid water at seven temperatures in the range 25 to 100 C were reported recently by H. F. Stimson of NBS. These measurements have an estimated standard deviation of 20 ppm or less, except at 25 C...
Journal of Research of NIST and Predecessor Publications

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