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Displaying 52151 - 52175 of 74191

NIST Atomic and Molecular Databases on the World Wide Web

August 1, 1998
Author(s)
Robert A. Dragoset, Peter J. Mohr, Karen J. Olsen, Edward B. Saloman, G G. Wiersma, D Zucker
The Physics Laboratory of the National Institute of Standards and Technology is using the world wide web to disseminate the physical reference data it has been producing and/or evaluating. Web databases have been developed, each with an interface specially

NIST Atomic Spectra Database (1998)

August 1, 1998
Author(s)
Yuri Ralchenko
We put Version 1 of this database online as an interactive Web server in 1995. Our first version has data on atomic energy levels for some 500 spectra, transition probability data for spectra of the iron-group elements, and wavelength data for spectra of a

Obstacle Detection and Mapping System

August 1, 1998
Author(s)
H Tsai-Hong, Steven Legowik, M Nashman
This paper discusses and evaluates an obstacle detection algorithm developed at NIST in support of the DEMO III Unmanned Ground Vehicle (UGV) program. The algorithm is a hybrid of grid-based and sensor-based obstacle detection and mapping techniques and is

On the Validity of the Poisson Hypothesis for Low-Level Counting; Investigation of the Distributional Characteristics of Background Radiation with the NIST Individual Pulse Counting System

August 1, 1998
Author(s)
George A. Klouda, Lloyd A. Currie, E M. Eijgenhuijsen
Does radioactive decay follow the Poisson distribution?--a fundamental question to which the theoretical answer seems to be, Yes. On the practical side, the answer to this question impacts the best achievable precision in well-controlled counting

Plane Wave Integral Representation for Fields in Reverberation Chambers

August 1, 1998
Author(s)
David A. Hill
A plane wave integral representation is presented for well-stirred fields in a reverberation chamber. The representation automatically satisfies Maxwell's equations in a source-free region and the statistical properties of the fields are introduced through

Reflection Measurement Problems Arising from Haze

August 1, 1998
Author(s)
George R. Jones Jr., Edward F. Kelley
Irreproducibility in some reflection measurement methods arises from the observance of the haze component of reflection (non-regular-specular, non-Lambertian). Because of the haze component, the measured reflection is sensitive to the apparatus

Scanning Height for ANSI C63.5 Calibrations

August 1, 1998
Author(s)
Kenneth H. Cavcey, Dennis G. Camell
The configuration of antennas at an Open Area Test site (OATS) for calibrations results in constructive and destructive electric fields. Regardless of the calibration method used, the antenna to be calibrated should be loacted where the field varies slowly

Size Changes and Interpenetration Within Concentrated Dendrimer Solutions

August 1, 1998
Author(s)
T J. Prosa, Barry J. Bauer, A Topp, Eric J. Amis, R L. Scherrenberg
The field of dendrimer research has grown dramatically in recent years with the synthesis of new materials quickly outpacing the characterization of simple material properties.[1] The lack of dendrimers in sufficient quantities has inhibited the ability to

Size Dependent Electronic Level Structure of InAs Nanocrystal Quantum Dots: Test of Multiband Effective Mass Theory

August 1, 1998
Author(s)
U Banin, J C. Lee, A A. Guzelian, A V. Kadavanich, A P. Alivastos, Garnett W. Bryant, A L. Efros, M Rose, W Jaskolski
The size dependence of the electronic spectrum of InAs nanocrystals ranging in radius from 10 to 35 Angstrom} has been studied by size-selective spectroscopy. An eight-band effective mass theory of the quantum size levels has been developed which describes

Spherical-Wave Characterization of Interior and Exterior Sources

August 1, 1998
Author(s)
David A. Hill
This paper presents the theoretical basis for spherical, near-field scanning in the general case where radiating sources exist both inside and outside the measurement region. The fields are expanded in terms of outgoing spherical waves (due to interior

Spinodal Dewetting of Thin Polymer Films

August 1, 1998
Author(s)
R H. Xie, Alamgir Karim, Jack F. Douglas, Charles C. Han, Robert A. Weiss
Dewetting of polystyrene (PS) films on a silicon substrate is investigated as a function of film thickness, h. We observe the nucleation of holes in the early stage of dewetting for relatively thick films (h > 100 {Angstrom}), as observed previously, but

STEP AP213 Coverage Analysis

August 1, 1998
Author(s)
Shaw C. Feng, Lihong Qiao
This report provides a quantitative coverage analysis of a draft Application Protocol (AP) for numerically controlled machining process plans in an international standard for product data representation and exchange. The analysis addresses the

Structure and Soot Properties of Nonbuoyant Ethylene/Air Laminar Jet Diffusion Flames

August 1, 1998
Author(s)
D L. Urban, Zeng-guang Yuan, Peter B. Sunderland, Gregory T. Linteris, J. E. Voss, Kenneth Lin, Z Dai, Kairan Sun
The structure and soot properties of round, soot-emitting, nonbuoyant, laminar jet diffusion flames are described, based on long-duration (175-230-s) experiments at microgravity carried out on orbit in the Space Shuttle Columbia. Experimental conditions

Survey of Job Shop Scheduling Techniques

August 1, 1998
Author(s)
Albert T. Jones, Luis C. Rabelo
A large number of approaches to the modeling and solution of job shop scheduling problems have been reported in the Operations Research (OR) literature, with varying degrees of success. These approaches revolve around a series of technological advances
Displaying 52151 - 52175 of 74191
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