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Displaying 43476 - 43500 of 74079

Electromagnetic Technology Division 2001 Technical Accomplishments

January 1, 2002
Author(s)
Sara E. Metz
The roughly forty staff and guest scientists in the Electromagnetic Technology Division take great pride in bringing you this brief report on recent progress in our Division. We have a long history of inventing and disseminating new standards and

Eleventh International Conference on Computer Technology in Welding

January 1, 2002
Author(s)
Thomas A. Siewert, C Pollock
These are proceedings of the eleventh conference in this series. The conference was held December 5 and 6, 2001, in Columbus, Ohio, under the sponsorship of the American Welding Society, NIST, and The proceedings include 32 presentations grouped into

Energy Dispersive X-ray spectromety by Microcalorimetry for the SEM

January 1, 2002
Author(s)
Dale E. Newbury, David A. Wollman, Sae Woo Nam, Gene C. Hilton, Kent D. Irwin, John A. Small, John M. Martinis
Analytical x-ray spectrometry for electron beam instruments has been significantly advanced with the development of the NIST microcalorimeter energy dispersive x-ray spectrometer (mcal EDS). The mcal EDS operates by measuring the temperature rise when a

Enhanced Powder Panels

January 1, 2002
Author(s)
D C. Cyphers, Scott A. Frederick, John P. Haas
Ballistic threat-induced fires are a major contributor to aircraft vulnerability. This paper describes a recent investigation of new concepts for powder panels, an old alternative for discharging dry chemical agents to extinguish combat-induced fires in

Error Free Liquid Flow Diverters for Calibration Facilities (FEDSM2002-31085)

January 1, 2002
Author(s)
Tsyh Tyan Yeh, Aaron N. Johnson, Pedro I. Espina, N Yende
A design for diverter valves in gravimetric liquid flow calibration facilities is proposed. The concept makes use of repeated unidirectional motions of the diverter valve to reduce errors associated with asymmetry in the diverter valve motion and in the

Excitonic Effects on Optical Second-Harmonic Polarizabilities of Semiconductors

January 1, 2002
Author(s)
E K. Chang, Zachary H. Levine, Eric L. Shirley
We present an ab initio many-body formalism for computing the frequency-dependent second-harmonic polarizability of semiconductor materials that includes both local-field and excitonic effects. We calculate the second-harmonic polarizability for AIP, AIAs
Displaying 43476 - 43500 of 74079