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Displaying 46776 - 46800 of 73461

Morphological Stability of a Binary Alloy: Temperature-Dependent Diffusivity

November 1, 2000
Author(s)
Sam R. Coriell, Geoffrey B. McFadden, S R. Vanaerenbergh
The effect of the temperature dependence of the diffusion coefficient on the morphological stability of a binary alloy during directional solidification is treated by a linear stability analysis. The Soret effect is also included in the analysis. Specific

Opto-Mechanical and Electronic Design of a Tunnel-Trap Si-Radiometer

November 1, 2000
Author(s)
George P. Eppeldauer, D C. Lynch
A transmission-type light-trap silicon-radiometer has been developed for the Spectral irradiance and Radiance Response Calibrations with Uniform Sources (SIRCUS) Facility of NIST to hold the spectral power and irradiance responsivity scales between 406 nm

Overview of the TREC-8 Web Track

November 1, 2000
Author(s)
D Hawking, Ellen M. Voorhees, Nick Craswell, Peter Bailey
The TREC-8 Web Track defined ad hoc retrieval tasks over a 100 gigabyte collection of spidered Web documents (Large Web Task) and a selected 2 gigabyte subset of those documents (Small Web Task). Here, the guidelines and resources for both tasks are

Phase Equilibria and Dielectric Behavior in the CaO:Al 2 O 3 :Nb 2 O 5 System

November 1, 2000
Author(s)
Terrell A. Vanderah, W Febo, Julia Y. Chan, Robert S. Roth, J. M. Loezos, L D. Rotter, Richard G. Geyer, B A. Reisner, Dennis B. Minor
Subsolidus phase equilibria in the CaO:Al2O3:Nb2O5 system at 1325 C in air have been determined. One ternary phase forms, Ca2AlNbO6, which exhibits a perovskite-related structure with 1:1 or NaCl-type ordering of Al3+ and Nb5+ on the B-sites. Indexed X-ray

Plastic Strain in Thermally Cycled Flip-Clip PBGA Solder Bumps

November 1, 2000
Author(s)
Elizabeth S. Drexler
Electron-beam Moire, a technique to measure dis-placements on the sub-micrometer scale, was used to observe and calculate strain in an underfilled, flip-chip plastic ball grid array (PBGA) package. A cross section of the package, instrumented with 450-nm

Radiometric Standards in Space: The Next Step

November 1, 2000
Author(s)
D. B. Pollock, Thomas L. Murdock, Raju V. Datla, Ambler Thompson
The lack of accurate calibration sources is preventing the current sensor technology from achieving the minimum possible uncertainty levels in remote-sensing radiometric measurements. This has been established in a recent study undertaken at the National

Reflection Approximation in Photoassociation Spectroscopy

November 1, 2000
Author(s)
C Boisseau, E Audouard, J Vigue, Paul S. Julienne
We construct an analytical wavefunction in the phase-amplitude formalism to describe collisions between two neutral atoms. This wavefunction is valid from intermediate to asymptotic internuclear distance over a large energy range near zero energy; and is

Report of the 85th National Conference on Weights and Measures

November 1, 2000
Author(s)
H V. Oppermann, J A. Koenig
The 85th Annual Meeting of the National Conference on Weights & Measures (NCWM), was held July 16 through July 20, 2000 at the Omni Richmond Hotel in Richmond, VA. The theme of the meeting was, Basic Standards-Builidng-the Foundation for a New Millennium

Report of the Sub-Committee on Reference Materials

November 1, 2000
Author(s)
John A. Tesk
Since the last meeting of the subcommittee at The World Biomaterials Congress, there are several items related to sub-committee activities.1) Reference Material (RM) 8456, Ultra High Molecular Weight Polyethylene (UHMWPE), is now available from The

Scanning Electron Microscopy in Concrete Petrography

November 1, 2000
Author(s)
Paul E. Stutzman
Scanning electron microscopy has distinct advantages for characterization of concrete, cement, and aggregate microstructure, and in the interpretation of causes for concrete deterioration. Scanning electron microscope imaging facilitates identification of

Shape Factors of ISO 12103-A3 (Medium Test Dust)

November 1, 2000
Author(s)
Robert A. Fletcher, David S. Bright
A new derivative of Arizona sand, ISO Medium Test Dust, is coming into use as a liquid optical particle count calibrant. ISO Medium Test Dust and optical particle counters are used to test filtering efficiency. Particle shape plays a role in both filtering

Simulation of Methanol Combustion in the NIST Reference Spray Combustor

November 1, 2000
Author(s)
D S. Crocker, M G. Giridharan, J F. Widmann, Cary Presser
This paper describes the simulation of methanol spray flame in the NIST reference spray combustion facility, which was predicited using a state-of-the-art, unstructured-mesh CFD code. The code solves the gas-phase equations in an Eulerian frame using the

Spectral Data for Atoms and Ions

November 1, 2000
Author(s)
Joseph Reader
Progress continues on the development of databases for spectral properties of atoms and ions. Version 2.0 of the NIST Atomic Spectra Database (ASD) became available on the World Wide Web in March 1999. This version contains data for many maore spectra than

Strong Anisotropy in Thin Magnetic Films Deposited on Obliquely Sputtered Ta Underlayers

November 1, 2000
Author(s)
Robert McMichael, C G. Lee, John E. Bonevich, P J. Chen, W. Wyatt Miller, William F. Egelhoff Jr.
Anisotropy fields in excess of 120 kA/m (1500 Oe) have been produced in 3-5 nm- thick polycrystalline films of Co by oblique sputtering of Ta underlayers. The unusually high anisotropy is magnetostatic in origin, and is induced by corrugations on the

Sum Frequency Spectroscopy Studies of Adsorption of Additives on Metal/Electrolyte Interfaces

November 1, 2000
Author(s)
Clayton S. Yang, Lee J. Richter, Kimberly Briggman, John C. Stephenson, Thomas P. Moffat, Gery R. Stafford
In situ and ex situ VR-SFG studies of mercaptopropylsulfonate (MPSA) molecules adsorbed on metal/electrolyte interfaces prove the molecular conformation is sensitive to hydration. MPSA catalyses electrodeposition of copper interconnection for semiconductor

Suppression of Low Strain Rate Flames by an Agent (NISTIR 6588)

November 1, 2000
Author(s)
Anthony P. Hamins, Matthew F. Bundy, I K. Puri
The structure and suppression of low strain rate methane-air nonpremixed flames were investigated experimentally and computationally. Measurements of the critical suppression conditions were conducted using N2, CO2, and CF3Br added to the fuel or oxidizer
Displaying 46776 - 46800 of 73461
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