NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 51276 - 51300 of 73697

A Problem in AC Quantized Hall Resistance Measurements and a Proposed Solution

November 1, 1998
Author(s)
Marvin E. Cage, Anne-Marie Jeffery
In all experiments reported to date the measurement values of the ac quantized Hall resistances R H varied with the applied current frequency, and differed significantly from the dc values of R H, making it difficult to use the ac quantum Hall effect as an

Amorphous Alloys Containing Cobalt for Orthopaedic Applications

November 1, 1998
Author(s)
John A. Tesk, C E. Johnson, Drago Skrtic, Ming S. Tung, Stephen M. Hsu
Amorphous metal alloys have properties and structures unlike those of theircrystalline counterparts. For example, a multiphase crystalline structure may exhibit poor corrosion resistance while the amorphous structure is corrosion resistant. The high

Aperture Proximity Effects in High Heat Flux Sensors Calibration

November 1, 1998
Author(s)
A V. Murthy, Benjamin K. Tsai, Robert D. Saunders
In transfer calibration of heat flux sensors, a correction for the irradiance distribution across the sensing area may be required when the sensing areas of reference and test sensors are different. A method to calculate this correction using well known

Calculation of Measurement Uncertainty Using Prior Information

November 1, 1998
Author(s)
Steven D. Phillips, William T. Estler
We describe the use of Bayesian inference to include prior information about the value of the measurand in the calculation of measurement uncertainty. Typical examples show this can, in effect, reduce the expanded uncertainty by up to 85 %. The application

Demineralizing Effect of Dental Cements on Human Dentin

November 1, 1998
Author(s)
Y Shimada, Y Kondo, S Inokoshi, J Tagami, Joseph M. Antonucci
This study was undertaken to verigy the hypothesis that dentin surfaces are demineralized during placement of four kinds of chemically setting cements (zinc phosphate cement, luting glass-ionomer cement, restorative glass-ionomer cement, and zinc

Diagnostics of 'Colossal' Magnetoresistance Manganate Films by Raman Spectroscopy

November 1, 1998
Author(s)
V B. Podobedov, D B. Romero, A Weber, Joseph P. Rice, R Schreekala, M Rajeswari, R Ramesh, T Venkatesan, H D. Drew
Polarized Raman scattering by phonons is used to characterize thin films prepared by laser ablation of a lanthanum manganese oxide target. It was found that in the temperature range from 6 K to 300 K phonon spectra of La 0.7Ca 0.3MnO 3 films exhibit

Effect of Powder Grinding on Hydroxyapatite Formation in a Polymeric Calcium Phosphate Cement Prepared from Tetracalcium Phosphate and Poly[Methyl Vinyl Ether-Maleic Acid]

November 1, 1998
Author(s)
Y Matsuya, S Matsuya, Joseph M. Antonucci, S. Takagi, Laurence C. Chow, A Akamine
The primary aim of this study was to determine if cement based on poly(methyl vinyl ether-maleic acid) (PMVE-Ma) and tetracalcium phosphate (TTCP) resulted in hydroxyapatite (OHAp) formation. In addition, the mechanical strength of this type of polymeric

Effect of Temperature on Electron Attachment to and Negative Ion States of CCl 2 F 2

November 1, 1998
Author(s)
Yicheng Wang, Loucas G. Christophorou, J. K. Verbrugge
The effect of temperature on electron attachment to dichlorodifluoromethane (CCl 2F 2) has been investigated for temperatures up to 500 K and for mean electron energies from thermal to 1.0 eV using an electron swarm method. The measurements were made in

Elastic-Strain Tensor by Rietveld Refinement of Diffraction Measurements

November 1, 1998
Author(s)
Davor Balzar, R B. Voneele, K Bennett, H M. Ledbetter
By collecting diffraction patterns at different specimen orientations, the procedure to obtain all components of the elastic-strain tensor by Rietveld refinement is described. It is shown that the refined lattice parameters yield the hydrostatic strain

Equilibrium Structure of Hydrogen-Bonded Polymer Blends

November 1, 1998
Author(s)
C Zhou, Erik K. Hobbie, Barry J. Bauer, Charles C. Han
Deuterium-labeled polystyrene modified by random distributions of the comonomer p-(1,1,1,3,3,3-hexaflouro-2-hydroxyisopropyl)-α-Methyl-styrene [DPS(OH)] has been blended with poly (butyl methacrylate) (PBMA) and studied with small-angle neutron scattering
Displaying 51276 - 51300 of 73697
Was this page helpful?