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Displaying 45151 - 45175 of 74193

The Influence of a Multilayered Metallic Coating on Fatigue Crack Nucleation

November 1, 2001
Author(s)
Mark R. Stoudt, Richard E. Ricker, R C. Cammarata
A through review of the literature on fatigue crack initiation indicates that for optimum resistance to fatigue crack initiation, a surface coating needs more than just a high hardness and that a combination of properties including toughness, cyclic work

The Role of High-purity Noble Metals in Precision Thermometry

November 1, 2001
Author(s)
Dean C. Ripple, Gregory F. Strouse, Weston L. Tew
A variety of alternate calibration schemes which approximate the ITS-90 are possible when using high-purity noble metals. The high purity of the sensor materials allows the use of correlations that exist between the measured properties at fixed point

Thermal Stability of MOCVD and HVPE GaN Layers in H 2 , HCl, NH 3 and N 2

November 1, 2001
Author(s)
M A. Mastro, O M. Kryliouk, M D. Reed, T J. Anderson, Albert Davydov, Alexander J. Shapiro
This work represents a complete study of GaN annealed in H 2, HCl, NH 3 and N 2. The GaN thermal behavior was evaluated by comparison of MOCVD and HVPE samples. The MOCVD films were observed to undergo dissociative sublimation mechanism with only gaseous

Thermodynamic Assessment of the Gallium - Nitrogen System

November 1, 2001
Author(s)
Albert Davydov, William J. Boettinger, Ursula R. Kattner, T J. Anderson
Thermochemical and phase diagram data for the Ga-N system were assessed by employing the CALPHAD method. A consistent model representation of available thermodynamic properties agrees well with the critically evaluated experimental data. Thermodynamic

Thin-Film Elastic-Property Measurements With Laser-Ultrasonic SAW Spectrometry

November 1, 2001
Author(s)
Donna C. Hurley, Vinod K. Tewary, A J. Richards
We have developed laser-ultrasonic methods to evaluate the elastic properties of thin films. Our method, called SAW spectrometry, used broadband surface acoustic waves (SAWs) generated by a line-focused, pulsed laser, SAWs with frequency components up to

Tool Point Frequency Response Prediction for High-Speed Machining by RCSA

November 1, 2001
Author(s)
Tony L. Schmitz, Michael Kennedy, Matthew A. Davies
The implementation of high-speed machining for the manufacture of discrete parts requires accurate knowledge of the system dynamics. We describe the application of receptance coupling substructure analysis (RCSA) to the analytic prediction of the tool

Transmission-line Parameter Approximation for Digital Simulation

November 1, 2001
Author(s)
Dylan Williams, Christopher L. Holloway
This paper compares closed-form approximations for coplanar waveguide and microstrip transmission-line parameters to accurate measurements and full-wave calculations. We suggest improved approximations and demonstrate the limitations of our proposed and

Trial Shape-Sensitive Linewidth Measurement System

November 1, 2001
Author(s)
John S. Villarrubia, Andras Vladar, Michael T. Postek
This is a report for a project to develop a scanning electron microscope (SEM) based shape-sensitive linewidth measurement system by improving the method by improving the method by which SEM data are analyzed. We report significant developments in

Ultrafast Time-Resolved Soft X-Ray Photoelectron Spectroscopy of Dissociating Br 2

November 1, 2001
Author(s)
L Nugent-Glandorf, M Scheer, D A. Samuels, A M. Mulhisen, E R. Grant, X Yang, V M. Bierbaum, S R. Leone
The dissociation of excited state Br 2 is probed with the novel technique of ultrafast soft x-ray photoelectron spectroscopy. Excited Br 2 molecules are prepared in the dissociative 1II u state with 80 fs 400 nm pulses, and a series of photoelectron

Ultraviolet Chambers Based on Integrating Spheres for Use In Artificial Weathering

November 1, 2001
Author(s)
Joannie W. Chin, E Byrd, N Embree, Jonathan W. Martin, J D. Tate
Laboratory ultraviolet (UV) chambers are widely used to obtain weathering data for a wide range of commercial polymer products including coatings, textiles, elastomers, plastics and polymeric composites. Although numerous improvements have been made in the

Use of Legendre Transforms in Chemical Thermodynamics

November 1, 2001
Author(s)
R Alberty, J M. Barthel, E R. Cohen, Michael B. Ewing, Robert N. Goldberg, E Wilhelm
The fundamental equation of thermodynamics for the internal energy U may include terms for various types of work and involves only differentials of extensive variables. The fundamental equation for U yields intensive variables as partial derivatives of the

User's Guide to NIST Fingerprint Image Software (NFIS)

November 1, 2001
Author(s)
Michael D. Garris, Craig I. Watson, R. McCabe, Charles L. Wilson
This report documents a public domain fingerprint image software distribution developed by the National Institute of Standards and Technology (NIST) for the Federal Bureau of Investigation (FBI). The software technology contained in this distribution is a

VAMAS: Accomplishments and Future Directions

November 1, 2001
Author(s)
Stephen W. Freiman, E A. Early
The Versailles Project on Advanced Materials and Standards (VAMAS) was created in 1982 to support trade through international collaboration in pre-standards research in advanced materials. VAMAS has become self-sustaining through Memoranda of Understanding

W3C Quality Assurance Activity Initiated

November 1, 2001
Author(s)
Lynne S. Rosenthal
In order for web specifications to permit full interoperability and access to all, it is important that the quality of implementation be given as much attention as their development. Moreover, as the complexity of W3C specifications and their

Wireless Interfaces for IEEE 1451 Sensors Network

November 1, 2001
Author(s)
James D. Gilsinn, Kang B. Lee
NIST started working with industry and the Institute of Electrical Engineers (IEEE) in the mid 90''s to develop a standardized interface to network smart sensors. With the spread of wireless technology, more industries are looking to incorporate wireless

X-Ray Spectra in the 12- to 60- keV Energy Range From Plasmas Produced by the OMEGA Laser

November 1, 2001
Author(s)
J Seely, R Deslattes, Lawrence T. Hudson, G Holland, R Atkin, D D. Meyerhofer, C Stoeckl
X-ray spectra in the energy range (12 to 60) keV were recorded by a transmission crystal spectrometer from targets irradiated by the 60 beam, difference} 30 kJ, OMEGA laser. The targets consisted of planar silver and goldfoils, spherical gold targets, and
Displaying 45151 - 45175 of 74193
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