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NIST Authors in Bold

Displaying 8051 - 8075 of 9859

Securing Voice Over Internet Protocol (IP) Networks

October 1, 2004
Author(s)
Thomas J. Walsh, David R. Kuhn
Voice over IP - the transmission of voice over traditional packet-switched IP networks - is one of the hottest trends in telecommunications. As with any new technology, VOIP introduces both opportunities and problems. Lower cost and greater flexibility are

Shape Analysis of a Reference Cement

October 1, 2004
Author(s)
Edward J. Garboczi, Jeffrey W. Bullard
Recently, techniques for acquiring, analyzing, and using 3-D shape information for aggregates (sand, gravel) have been developed and demonstrated. These mathematical techniques, based on spherical harmonic coefficient analysis, have been applied to x-ray

Analysis of Switching in Uniformly Magnetized Bodies

September 1, 2002
Author(s)
Michael J. Donahue, Donald G. Porter
A full analysis of magnetization reversal of a uniformly magnetized particle by coherent rotation is presented.The magnetization energy of the particle in the presence of an applied field H is modeled as E = ( 0/2)MT DM - 0HTM.This model includes shape

Overview of Communication Standards relating to Motion Control Systems

December 31, 2001
Author(s)
Frederick M. Proctor, John L. Michaloski
This report surveys the international communications standards that affect the application and development of motion control technology. The scope of motion control covered includes applications as diverse as robotics, packaging machinery, discrete parts

The Role of Standards in Innovation

July 1, 2000
Author(s)
Robert Allen, Ram D. Sriram
We review and explore the role of standards in innovation, with particular emphasis on the design and manufacturing processes. We begin by defining and classifying standards and by exploring their role and infrastructure in society. This is followed by a

Contribution of Evanescent Waves to the Far-Field: the Atomic Point of View

April 1, 2000
Author(s)
A Rahmani, Garnett W. Bryant
Evanescent modes of the electromagnetic field are seldom invoked in conventional far-field optics, as their contribution far from the source (say a few wavelengths) is negligible. Contradicting this fact, in recent theoretical works, based on a particular

Digital Library Support for Engineering Design and Manufacturing

September 1, 1999
Author(s)
William Regli
This paper describes our initial efforts to deploy a digital library to support engineering design and manufacturing. This experimental testbed, The Engineeting Design Repository, is an effort to collect and archive public domain engineering data for use

Anharmonic Phonons and the Isotope Effect in Superconductivity

January 1, 1991
Author(s)
V Crespi, Marvin Cohen, David R. Penn
Anharmonic interionic potentials are examined in an Einstein model to study the unusual isotope-effect exponents for the high-T(c) oxides. The mass dependences of the electron-phonon coupling constant λ and the average phonon frequency square-root <ω2> are

Surface, Interface and Thin-Film Magnetism

January 1, 1990
Author(s)
L Falicov, Daniel T. Pierce, S Bader, R Gronsky, K Hathaway, H Hopster, D Lambeth, S Parkin, G Prinz, M Salamon, Ivan K. Schuller, R Victora
A comprehensive review and state of the art in the field of surface, interface, and thin-film magnetism is presented. New growth techniques which produce atomically engineered novel material, special characterization techniques to measure meagnetic

Quantifying grating defects in X-ray Talbot-Lau interferometry through a comparative study of two fabrication techniques

April 24, 2025
Author(s)
Alexandre Pereira, Simon Spindler, Zhitian Shi, Lucia Romano, Michal Rawlik, Federica Marone, Martin Stauber, Marco Stampanoni, Daniel Josell
The performance of an X-ray grating interferometry system depends on the geometry and quality of the gratings. Fabrication of micrometer-pitch high-aspect-ratio gold gratings, which are essential for measuring small refraction angles at higher energies, is

Binary Pseudo-Random Array for Calibration of Interferometers with Transmission Spheres and Cylinders

September 30, 2024
Author(s)
Ulf Griesmann, Keiko Munechika, Simon Rochester, Weilun Chao, Carlos Pina-Hernandez, Kaito Yamada, Michael Biskach, Peter Takacs, Valeriy Yashchuk
Binary pseudo-random array (BPRA) "white noise" artifacts are highly effective for characterizing the instrument transfer function (ITF) of surface topography metrology tools and wavefront measurement instruments. These BPRA artifacts feature all spatial

Pore Formation Driven by Particle Impact in Laser, Powder-blown Directed Energy Deposition

May 26, 2023
Author(s)
Edward Garboczi, Newell Moser, Samantha Webster, Kornel Ehmann, Jian Cao, Kamel Fezzaa, Tao Sun
Material manufactured by laser, powder-blown directed energy deposition often contains residual pores, which can be detrimental to the strength and fatigue life of a part. We uncover a new kind of pore formation that is driven by powder particle impact

Coalition and Threshold Hash-Based Signatures

February 25, 2022
Author(s)
John M. Kelsey, Stefan Lucks
We show how to construct a threshold version of stateful hash-based signature schemes like those defined in XMSS (defined in RFC8391) and LMS (defined in RFC8554). Our techniques assume a trusted dealer and secure point-to-point communications; are

Validation of Aerosol Dynamics in a Well-Stirred Isothermal Enclosure

September 30, 2021
Author(s)
Amy Mensch, Thomas Cleary
Modeling of aerosol dynamics in fire simulations enables predictions of the effects of soot, such as visibility and detection, and the fate of soot, such as deposition and emissions. NIST's fire modeling tool, Fire Dynamics Simulator (FDS), has implemented
Displaying 8051 - 8075 of 9859
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