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Journals

Guiding Neutral Atoms Around Curves With Lithographically Patterned Current-Carrying Wires

December 1, 1999

Author(s)

D Muller, D Z. Anderson, R J. Grow, P Schwindt, Eric A. Cornell

Laser-cooled neutral atoms from a low-velocity atomic source are guided via a magnetic field generated between two parallel wires on a glass substrate. The...

The Theory of Bose-Einstein Condensation of Dilute Gases

December 1, 1999

Author(s)

Karen G. Burnett, M Edwards, Charles W. Clark

In this article, we present a current perspective on advances in the theoretical understanding of Bose-Einstein condensation from the standpoint of atomic...

Ultrasensitive Frequency-Modulation Spectroscopy Enhanced by a High-Finesse Optical Cavity: Theory and Application to Overton Transitions of C₂H₂ and C₂HD

December 1, 1999

Author(s)

L -. Ma, J Ye, John L. Hall

The sensitivity of FM spectroscopy can be dramatically enhanced by location of the sample in a high-finesse cavity, for example, -5 orders of magnitude in this...

S and Si Ion-Implantation in GaSb Grown on GaAs

December 1, 1999

Author(s)

M V. Rao, A K. Berry, T Q. Do, M C. Ridgway, P Chi, J Waterman

Single and multiple energy S and Si ion-implantations were performed at room temperature (RT) and at 200 C into GaSb epitaxial layers grown on semi-insulating...

Correlation of End-of-Range Damage Evolution and Transient Enhanced Diffusion of Boron in Regrown Silicon

December 1, 1999

Author(s)

L S. Robertson, M E. Law, K. S. Jones, L M. Rubin, J Jackson, P Chi, David S. Simons

Amorphization of a n-type Czochralski wafer was achieved using a series of Si + implants of 30 and 120 kvV, each at a dose of 1X10 15 cm 2. The Si + implants...

A New Method to Measure the Distance Between Graduation Lines on Graduated Scales

December 1, 1999

Author(s)

William B. Penzes, Robert Allen, Michael W. Cresswell, L Linholm, E C. Teague

Line scales are used throughout industry for a variety of applications. The most common is the stage micrometer, a small graduated glass scale for the...

Application of Microcalorimeter EDS X-Ray Detectors to Particle Analysis

December 1, 1999

Author(s)

Alain C. Diebold, David A. Wollman, Gene C. Hilton, Kent D. Irwin, John M. Martinis, B. H. Liu

New microcalorimeter x-ray detector technology will revolutionize materials characterization. It is expected that the microcalorimeter EDS (energy dispersive...

Domain-Engineered Pyroelectric Radiometer

December 1, 1999

Author(s)

John H. Lehman, George P. Eppeldauer, J A. Aust, M. Racz

We built a large-area domain-engineered pyroelectric radiometer with high spatial and spectral response uniformity that is an excellent primary transfer...

High-Speed Resonant Cavity Enhanced Photodiodes

December 1, 1999

Author(s)

M. S. {Umlat}nl{umlat}, E. Vzbay, E. Towe, Richard Mirin, David H. Christensen

We have demonstrated RCE Schottky phodiodes with GaAs absorption regions in AlGaAs/AlAs microcavities (3).

A New Method to Measure the Distance Between Graduation Lines on Graduate Scales

December 1, 1999

Author(s)

William B. Penzes, Richard A. Allen, Michael W. Cresswell, Loren W. Linholm, E C. Teague

Fast and Accurate Low-Coherence Interferometric Measurements of Fiber Bragg Grating Dispersion and Reflectance

November 22, 1999

Author(s)

Shellee D. Dyer, Kent B. Rochford, Allen Rose

We demonstrate fast and accurate measurements of fiber Bragg grating dispersion and spectral reflectance using low-coherence interferometry.

Two-Dimensional Index Profiling of Fibers and Waveguides

November 20, 1999

Author(s)

N. H. Fontaine, M. Young

We have constructued a two-dimensional refracted-ray scanner that can resolve index-of-refraction increments of approximately 4 x 10 -5. this resolution is an...

Ion-Exchanged Waveguide Lasers in Er³⁺/Yb³⁺ Codoped Silicate Glass

November 20, 1999

Author(s)

P. M. Peters, David S. Funk, A P. Peskin, D. L. Veasey, Norman Sanford, S. N. Houde-Walter, Joseph S. Hayden

We investigated an Er 3+ /Yb 3+ codoped silicate glass as a host material for waveguide lasers operating near 1.5 micro (mu).

Microhotplate Gas Sensor Arrays

November 18, 1999

Author(s)

Richard E. Cavicchi, Stephen Semancik, R M. Walton, B Panchapakesan, Don L. DeVoe, M I. Aquino-Class, J D. Allen, John S. Suehle

In this work, micromachining and planar processing has been used to achieve solid state sensing devices with lower power consumption at lower cost. The small...

Lessons from 342 Medical Device Failures

November 17, 1999

Author(s)

D Wallace, David R. Kuhn

Today's highly complex systems often contain software. Lessons can be learned about softwaredevelopment and assurance concerning quality practices, from system...

Determination of Texture From Individual Grain Orientation Measurements

November 17, 1999

Author(s)

J Blendell, Mark D. Vaudin, Lin-Sien H. Lum

We present a technique for determining the texture of a polycrystalline material based on the measurement of the orientation of a number of individual grains...

Using Chaos to Generate White Noise

November 15, 1999

Author(s)

Richard L. Kautz

Numerical simulations reveal that a phase-locked loop can be operated in a chaotic regime to generate a high level of noise which is approximately white over a...

The Differential Adsorption of Phenol Derivatives onto a Polymeric Sorbent: A Combined Molecular Modeling and Expermential Study

November 11, 1999

Author(s)

K L. Mardis, A J. Glemza, B J. Brune, G F. Payne, M K. Gilson

Oxygenated aromatic compounds (OACs) are used for the synthesis of a variety of commercial products. Lignin from wood and other plant products are potential...

Reorientation of Tetradecylmethylviologen on Gold Upon Co-Adsorption of Decanethiol and its Medition of Electron Transfer to Nitrate Reductase

November 9, 1999

Author(s)

Vytautas Reipa, S L. Yeh, H G. Monbouquette, V L. Vilker

Decanethiol was coadsorbed with tetradecylmethyl viologen (C 14MV; 1-Methyl-1 -tetradecyl-4,4 -bipyridinium chloride) on gold electrodes in order to improve...

Evolution of Density Fluctuations to Lamellar Crystals in Linear Polyethylene

November 8, 1999

Author(s)

Y A. Akpalu, Eric J. Amis

Structure formation during the isothermal crystallization of a linear polyethylene (M w = 32,1000 g/ mol, M w/M n = 1.1) has been monitored by simultaneous real...

The Engineering of Mind

November 2, 1999

Author(s)

James S. Albus

While the mind remains a mysterious and inaccessible phenomenon, many of the components of mind, such as perception, behavior generation, knowledge...

A First Stop Towards Photorealistic Rendering of Coated Surfaces and Computer Based Standards of Appearance

November 1, 1999

Author(s)

Fern Y. Hunt, Egon Marx, G W. Meyer, Theodore V. Vorburger, P A. Walker, H B. Westlund

We seek to explore the feasibility of producing computer graphic images to visualize the color and gloss of surfaces using optical and surface topographical...

High-Temperature Properties of Liquid-Phase-Sintered Α-Sic

November 1, 1999

Author(s)

R P. Jensen, William E. Luecke, N P. Padture, Sheldon M. Wiederhorn

We have characterized the high-temperature subcritical crack growth and oxidation resistance of a liquid-phase-sintered (LPS) SiC with 20% volume fraction...

Off- Diagonal Elastic Constants in Fiber-Reinforced Composites

November 1, 1999

Author(s)

H M. Ledbetter, C M. Fortunko, Paul R. Heyliger

We present an alternative to the usual rod-resonance and pulse-echo measurement methods for determining off-diagonal C ij. The new approach - acoustic resonance...

Stress Rupture of Lead-Free Soldered Joints Used to Assemble Copper Plumbing Systems

November 1, 1999

Author(s)

Richard J. Fields, D A. Shepherd, A Cohen, A Kireta

In 1993, the National Institute of Standards and Technology (NIST), formerly NBS, was engaged to develop the necessary elevated temperature allowable stress...

Microstructure and Elastic-Constant Measurements of Two-Phase Materials

November 1, 1999

Author(s)

H M. Ledbetter, Martin Dunn

Considering two-phase materials, we focus on the relationship between microstructure and physical properties, especially elastic constants. Microstructure...

Filler-Induced Composition Waves in Phase-Separating Polymer Blends

November 1, 1999

Author(s)

B P. Lee, Jack F. Douglas, S C. Glotzer

The influence of a dilute concentration of filler particles on polymer blend phase separation is investigated computationally using a generalization of the Cahn...

Charge Lamp BAsed on MgH RAdiation

November 1, 1999

Author(s)

S Ukegawa, Alan Gallagher

We report the efficacy and spectrum of an inductively-coupled, radio-frequency discharge in mixtures of magnesium (Mg), hydrogen (H 2), and argon vapor. The...

Deployment Test of the NIST EOS Thermal-Infrared Transfer Radiometer

November 1, 1999

Author(s)

Joseph P. Rice, S C. Bender, W H. Atkins, Francis J. Lovas

The National Institute of Standards and Technology (NIST) Thermal-infrared Transfer Radiometer (TXR), developed for the National Aeronautics and Space...

Thermodynamic Properties of Vanadium Silicides. I. Standard Molar Enthalpy of Formation δ_fH of Vanadium Disilicide (VSi₂) at the Temperature of 298.15 K

November 1, 1999

Author(s)

P A. O'Hare, K Watling, G A. Hope

The massic energy of combustion of vanadium disilicide in fluorine according to the reaction: VSi 2(cr) + (13/2)F 2(g) = VF 5(g) + 2SiF 4(g), has been measured...

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