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Displaying 47251 - 47275 of 73832

Field Demonstration of Laser Scanning for Excavation Measurement

October 1, 2000
Author(s)
Geraldine S. Cheok, Robert R. Lipman, Christoph J. Witzgall, Javier Bernal, William C. Stone
The use of a scanning laser to measure terrain changes due to excavation at a construction site is described. The objective at this phase of the project is to develop the tools necessary to measure terrain changes in real-time. This paper focuses on

First Observation of the n 17 - n 4 Difference Bands of Diborane 10 B 2 H 6 and 11 B 2 H 6

October 1, 2000
Author(s)
J.- M. Flaud, Walter J. Lafferty, H Berger, G Pawelke, J L. Domenech, D Bermejo
An analysis of the Ņ 17 - Ņ 4 difference bands of two isotopic species, 10B 2H 6 and 11B 2H 6, of diborane has been carried out using infrared spectra recorded with a resolution of ca. 0.003 cm -1. In addition, the Ņ 17 band of 10B 2H ^ has been recorded

Future of Fire Investigation

October 1, 2000
Author(s)
Daniel M. Madrzykowski
As the legal climate for arson and fire investigations becomes more demanding, their need for a rigorous scientific foundation is growing. Fortunately, federal research efforts are already starting to close the gap.

Halocarbons 1: Methane Derivatives

October 1, 2000
Author(s)
Arno D. Laesecke
This poster (47 in x 30 in) shows ab initio computed structures of the chlorine and/or fluorine derivatives of methane. Some of these compounds are working fluids (ozone depleting and alternative) in refrigeration and air conditioning equipment. Others are

Interfacial Response of a Fluorescent Dye Grafted to Glass

October 1, 2000
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. VanZanten, Joy Dunkers, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The Quality of the fiber/resin interphase region is critical to the final mechanical properties of a composite. By grafting a fluorescent dye to a glass microscope cover slip, a model interphase region can be directly studied. A blue shift and increase in

ITL Technical Accomplishments 2000

October 1, 2000
Author(s)
Elizabeth B. Lennon, K K. Simon, M Helfer
The ITL Technical Accomplishments 2000 report presents the achievements and highlights of NIST's Information Technology Laboratory (ITL) during FY 2000. Technical projects in eight divisions are described, followed by industry interactions, international

Josephson Voltage Standards

October 1, 2000
Author(s)
Clark A. Hamilton
This paper reviews the development and use of Josephson voltage standards over the last 30 years, including classical dc standards, programmable standards based on binary weighted arrays, pulse-driven delta-sigma standards for ac wave-form synthesis, and

Low-Cost, Broadband Absorber Measurements

October 1, 2000
Author(s)
David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We present a method for evaluating broadband absorber in a non-ideal testing environment. Using broadband, short impulse TEM horns, a frequency-rich spectrum (equivalent pulse length 0.5 ns) illuminates a sample of material under test and the reflections

Low-Level (Submicromole) Environmental 14 C Metrology

October 1, 2000
Author(s)
Lloyd A. Currie, J D. Kessler, J V. Marolf, A. P. McNichol, D R. Stuart, J C. Donoghue, D. J. Donahue, William Burr, D Biddulph
Accelerator Mass Spectrometry (AMS) measurements of environmental 14C have been employed during the past decade at the several micromole level (10's of ug carbon), but advanced research in the atmospheric and marine sciences demands still higher

Managing Digital Libraries for Computer-Aided Design

October 1, 2000
Author(s)
William Regli, V Cicirello
This paper describes our initial efforts to deploy a digital library to support computer-aided collaborative design. At present, this experimental testbed, The Engineering Design Knowledge Repository, is an effort to collect and archive public domain

Material Properties of Titanium Diboride

October 1, 2000
Author(s)
R G. Munro
The physical, mechanical, and thermal properties of polycrystalline TiB 2 are reviewed with an emphasis on the significant dependence of the properties on the density and grain size of the material specimens. By examining the density and grain size

NIST Data Resources for X-Ray Photoelectron Spectroscopy

October 1, 2000
Author(s)
Cedric J. Powell
A short description is given of data resources that are available from the National Institute of Standards and Technology (NIST) for X-Ray Photoelectron Spectroscopy (XPS). NIST currently has three databases available: an XPS Database (SRD 20), an Elastic

Optical Tunnel-Trap Detector for Radiometric Measurements

October 1, 2000
Author(s)
John H. Lehman, Christopher L. Cromer
We have designed and evaluated an optical trap detector that is simple to fabricate and convenient to use. The trap geometry is a triangular tube similar to a kaleidoscope, with two photodiodes in place of a mirror on each side. One version incorporates
Displaying 47251 - 47275 of 73832
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