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Displaying 50476 - 50500 of 73697

Boron Substrates for the X-Ray Microanalysis of Particles

January 1, 1999
Author(s)
Eric S. Windsor, Dale E. Newbury, J Kessler
Boron is available commercially as high purity (> 0.995) crystalline pieces. Using metallographic sample preparation techniques, these crystalline pieces can be prepared to form substrates that are useful for the x-ray microanalysis of particles. Boron is

Brand Propagation From Large-Scale Fires.

January 1, 1999
Author(s)
J P. Woycheese, P J. Pagni, D Liepmann
This paper is one of a series on brand lofting and propagation. Here, spherical brand propagation in a constant ambient wind is addressed. Maximum propagation distances are calculated for wooden brands with diameters up to 0.18 m, which are lofted above

Brief review of primary methods applicable to key comparisons in acoustics

January 1, 1999
Author(s)
Victor Nedzelnitsky
Historically, various techniques have been used in acoustics to attempt to establish and measure sound pressures (spatially uniform amplitude of sound pressure, as in a suitable coupling cavity that is small compared with a wavelength of sound) and in the

Calculation of the Electron Self Energy for Low Nuclear Charge

January 1, 1999
Author(s)
U Jentschura, Peter J. Mohr, G Soff
We present a nonperturbative numerical evaluation of the one-photon electron self-energy for hydrogen like ions with low nuclear charge numbers Z = 1 to 5. Our calculation for 1S state has a numerical uncertainty of 0.8 Hz for hydrogen and 13 Hz for singly

Case Hardening Measurement with Quantitative Surface Acoustic Microscopy

January 1, 1999
Author(s)
Nelson N. Hsu, D Xiang, Gerald V. Blessing
Case hardening is widely applied to many critical parts in the automotive industry. Determining the hardened case depth is presently a time-consuming destructive process which would greatly benefit from an efficient nondestructive technique. It has been

Castaing's Electron Microprobe and its Impact on Materials Science

January 1, 1999
Author(s)
Dale E. Newbury
A central theme of modern materials science has been the exploration of the relationship between the microstructure of a material and its macroscopic properties. The answer to many materials science questions requires knowledge of the specific composition

Ceramics 1998 Programs and Accomplishments

January 1, 1999
Author(s)
Stephen W. Freiman
The mission of the Ceramics Division can be stated as follows:Work with industry, standards bodies, academia, and other government agencies in providing the leadership for the Nation's measurements and standards infrastructure for ceramic materials.The

Char Enhancing Approaches to Flame Retarding Polymers

January 1, 1999
Author(s)
Jeffrey W. Gilman, Takashi Kashiwagi, Richard H. Harris Jr., S M. Lomakin, J D. Lichtenhan, A. Bolf, P. Jones
Additives that increase the amount of charcoal-like residue or carbonaceous char that forms during polymer combustion are very effective fire retardants (FR). Our research efforts focus on reducing polymer flammability by promoting char formation. Our
Displaying 50476 - 50500 of 73697
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