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Displaying 48926 - 48950 of 73830

Quantitative Electron Probe Microanalysis of Rough, Bulk Samples

January 1, 2000
Author(s)
Dale E. Newbury
Surface roughness degrades the accuracy of quantitative electron probe x-ray microanalysis through the action of geometric effects on x-ray production and absorption. Measurements of rough surfaces produced on NIST microhomogeneous SRMs will be used to

Radiometry and Photometry: Review for Vision Optics

January 1, 2000
Author(s)
Yoshihiro Ohno
Radiometry is the measurement of optical radiation, which is electromagnetic radiation in the frequency range between 3 x 10 11 Hz and 3 x 10 16 Hz. This range corresponds to wavelengths between 10 nm and 1000 m, and includes the regions commonly called

Raman Intensity Calibration With Glass Luminescence Standards

January 1, 2000
Author(s)
E S. Etz, Wilbur S. Hurst, Steven J. Choquette
This Paper describes the NIST development of standards and procedures for the calibration of the Raman Spectral Intensity. The work is based on the NIST proposal of the use of luminescent glass standards for the transfer of the white light calibration to

Real-Time Dielectric Measurements During Extrusion of Filled Polymers

January 1, 2000
Author(s)
M M. McBrearty, Anthony J. Bur, S C. Roth
Mineral fillers are added to extend and modify physical properties of polymers. To achieve porcessing control of mixing, real-time measurements are needed. Previuos work has shown that dielectric sensors can measure concentrations of fillers in non-polar

Real-Time Displacement Measurements With a Fabry-Perot Cavity and a Diode Laser

January 1, 2000
Author(s)
Lowell P. Howard, Jack A. Stone Jr.
We present the basic operating principles of a traceable measurement system for use with scanned probe microscopes and nanometer-resolution displacement sensors. Our method is based upon a tunable external-cavity diode laser system which is Pound-Drever

Recent Progress in Nanoscale Indentation of Polymers Using the AFM

January 1, 2000
Author(s)
Mark R. VanLandingham, John S. Villarrubia, G Meyers
Regardless of the type of test, reliable indentation measurements require knowledge of the shape of the indenter tip. For indentation measurements involving sub-micrometer scale contacts, accurate knowledge of the tip shape can be difficult to achieve. In

Reduced Gravity Combustion of Thermoplastic Spheres

January 1, 2000
Author(s)
Jiann C. Yang, Anthony P. Hamins, Michelle K. Donnelly
A series of low-gravity experiments were conducted to investigate the combustion of supported thermoplastic polymer spheres under varying ambient conditions. The three types of thermoplastics investigated were polymethyl methacrylate (PMMA), polypropylene
Displaying 48926 - 48950 of 73830
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