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Displaying 45451 - 45475 of 73697

Sharp Interface Limit of a Phase-Field Model of Crystal Grains

May 1, 2001
Author(s)
A E. Lobkovsky, James A. Warren
We analyze a two-dimensional phase field model designed to describe the dynamics of crystalline grains. The phenomenological free energy is a function of a complex order parameter whose amplitude reflects the orientational order. Its phase is the

Silicoboron-Carbonitride Ceramics: A Class of High Temperature, Dopable Electronic Materials

May 1, 2001
Author(s)
P A. Ramakrishnan, Y T. Wang, Davor Balzar, L A. An, C Haluschka, R Riedel, A M. Hermann
The structure and electronic properties of polymer-derived silicoboroncarbonitride ceramics are reported. Analysis of the short-range order using the radial-distribution-function formalism showed that the local structure comprises Si tetrahedra with B, C

SMPTE Declarative Data Essence: Comparison to ATSC DASE

May 1, 2001
Author(s)
John Barkley, M A. Dolan, M Koo, Andrew McCaffrey, Leonard E. Gebase, Murugiah P. Souppaya
The Declarative Data Essence (DDE) Ad-hoc Group of the D27 Technical Committee of the Society for Motion Picture and Television Engineers [SMPTE] is developing ITV standards that provide basic functionality for ITV and represent current practice, known

Special Ultrasonic Flowmeters for In-Situ Diagnosis of Swirl and Cross Flow

May 1, 2001
Author(s)
Tsyh Tyan Yeh, Pedro I. Espina
The presence of non-ideal flow profiles is known to cause significant metering inaccuracies in conventional pipelines. The characteristics of secondary flows are also important for mixer design where flow non-ideality is highly desired. Advances in

Spectroradiometer Characterization for Colorimetry of LEDs

May 1, 2001
Author(s)
Yoshihiro Ohno, B Kranicz
The uncertainties in color measurements of LEDs by spectroradiometers can be much larger than those for traditional broadband sources due to the quasi-monochromatic nature of LED spectra. In this paper, the uncertainties in chromaticity of LEDS due to

Spontaneous Coherent Microwave Emission and the Sawtooth Instability in a Compact Storage Ring

May 1, 2001
Author(s)
Uwe Arp, Gerald T. Fraser, Angela R. Hight Walker, Thomas B. Lucatorto, K K. Lehmann, K Harkay, N Sereno, K Kim
Strong evidence for self-excited emission of coherent synchrotron radiation in the microwave spectral region was observed at the Synchrotron Ultraviolet Radiation Facility SURF III electron storage ring at the National Institute of Standards and Technology

Strengthening of Reinforced Concrete Beams with Carbon FRP

May 1, 2001
Author(s)
Dat Duthinh, M A. Starnes
Seven concrete beams reinforced internally with steel and externally with carbon fiber-reinforced polymer (FRP) laminate applied after the concrete had cracked were tested under four-point bending. Results show that FRP is very effective for flexural

Surface Oxidation as a Diffusion Barrier for Al Deposited on Ferromagnetic Metals

May 1, 2001
Author(s)
William F. Egelhoff Jr., P J. Chen, Robert D. McMichael, Cedric J. Powell, R Deslattes, F G. Serpa, Romel Gomez
We have used Grazing Incidence X-ray Reflectometry (GIXR) to study surface oxidation as a diffusion barrier for Al deposited on ferromagnetic metals (Co, Fe, Ni, and NiFe). Samples of the form SiO2 // 10nm X / 4nm Al and SiO2 // 10nm X/ 4nm Au with X = (Co

Surges Happen! How to Protect the Appliances in Your Home

May 1, 2001
Author(s)
Francois D. Martzloff
This booklet has been prepared to help home dwellers, owners, contractors, insurance agents, and all parties interested in reducing the number of cases and severity of equipment damage caused by the unavoidable surges that occur in the electrical systems

Temperature Variation of Magnetic Aftereffect

May 1, 2001
Author(s)
Lawrence H. Bennett
celerated testing of recording media to try to determine their life expectancy is one of the accepted tests that are currently utilized. The technique applied a reverse field to a magnetized decay and thus the amount of accelertion occurs at the peak of

The Atom Laser

May 1, 2001
Author(s)
S L. Rolston
This paper reviews the principles of atom laser action using Bose-Einstein condensed gases as sources of coherent matter waves.

The Electronic Kilogram

May 1, 2001
Author(s)
Michael H. Kelley
The kilogram is the only remaining base unit in the International System of Units (SI) whose definition is based on a single physical artifact rather than on fundamental properties of nature. Effects such as environmental contamination or material loss

The Impact-Echo Method: An Overview

May 1, 2001
Author(s)
Nicholas J. Carino
The impact-echo method is a technique for flaw detection in concrete. It is based on monitoring the surface motion resulting from a short-duration mechanical impact. The method overcomes many of the barriers associated with flaw detection in concrete based

The Maturity Method: From Theory to Application

May 1, 2001
Author(s)
Nicholas J. Carino, Hai S. Lew
The maturity method is a technique to account for the combined effects of time and temperature on the strength development of concrete. The method provides a relatively simple approach for making reliable estimates of in-place strength during construction

Towards a Traceable Nanoscale Force Standard

May 1, 2001
Author(s)
Jon R. Pratt, David B. Newell, Edwin R. Williams, Douglas T. Smith, John A. Kramar
The National Institute of Standards and Technology has launched a five-year project to traceably link the International System of Units (SI) to forces between 10 -8N and 10 -2N. In this paper, we give a background and overview of this project, discuss the
Displaying 45451 - 45475 of 73697
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