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Journals

Complex Permittivity Determination from Propagation Constant Measurements

February 1, 1999

Author(s)

Michael D. Janezic, Jeffrey A. Jargon

This letter presents a new transmission line method for measuring the complex permittivity of dielectric materials using propagation constant measurements. In...

Viscoelasticity of Xenon Near the Critical Point

February 1, 1999

Author(s)

Robert F. Berg, Michael R. Moldover, G A. Zimmerli

Using a novel, overdamped, oscillator flown aboard the Space Shuttle, we measured the viscosity of xenon near the liquid-vapor critical point in the frequency...

Combustion Experiments on STS-83 and STS-94: The Crew's Perspective

February 1, 1999

Author(s)

Gregory T. Linteris, J. E. Voss, R. Crouch

Despite years of planning and hundreds of drop-tower tests in preparation, the combustion experiments aboard STS-83 and STS-94 were full of surprises...

NIST-Traceable-Reference-Material Optical Filters Program for Chemical Spectrophotometry

February 1, 1999

Author(s)

John C. Travis, Gary W. Kramer

Genetically Engineered Metal Ion Binding Sites on the Outside of a Channel's Transmembrane Β-Barrel

February 1, 1999

Author(s)

John J. Kasianowicz, D L. Burden, L C. Han, S Cheley, H Bayley

We are exploring the ability of genetically engineered versions of the Staphlococcus aureus αHL} ion channel to serve as rationally designed sensor components...

A Thermodynamic Investigation of Some Reactions Involving Prephenic Acid

February 1, 1999

Author(s)

N Kishore, Marcia J. Holden, Yadu D. Tewari, Robert N. Goldberg

Calorimetric enthalpies of reaction have been measured for the following enzyme-catalyzed reactions at the temperature 298.15 Kprephenate(aq) = phenylpyruvate...

Metal-Insulator-Semiconductor Transmission Lines

February 1, 1999

Author(s)

Dylan F. Williams

This paper investigates the one-dimensional metal-insulator-semiconductor transmission line. It develops closed-form expressions for equivalent-circuit...

Standards Make Wireless Work

February 1, 1999

Author(s)

Roger Marks

Analysis of Urban Particulate Standard Reference Materials for the Determination of Chlorinated Organic Contaminants and Additional Chemical and Physical Properties

February 1, 1999

Author(s)

Dianne L. Poster, Michele M. Schantz, Stephen A. Wise, M. G. Vangel

Model for Exchange Bias in Polycrystalline Ferromagnet-Antiferromagnet Bilayers

February 1, 1999

Author(s)

Mark D. Stiles, Robert D. McMichael

Polycrystalline ferromagnet-antiferromagnet bilayers exhibit a wide range of interesting magnetic effects. This paper describes a model for these bilayers which...

NIST's support of rapid prototyping standards

February 1, 1999

Author(s)

Kevin K. Jurrens

Recent activities and interactions with industry have suggested to the National Institute of Standards and Technology (NIST) that formal standards for rapid...

Approximating the Permanent via Importance Sampling With Application to the Dimer Covering Problem

February 1, 1999

Author(s)

Isabel M. Beichl, F Sullivan

We estimate the asymptotic growth rate of the number of dimer covers of cubic lattice. Our estimate λ 3 = 0.4466 {plus or minus} 0.0006 is consistent with the...

The Palladium-Zirconium Phase Diagram

February 1, 1999

Author(s)

Richard M. Waterstrat, Alexander J. Shapiro, A Jeremie

The palladium-zirconium phase diagram has been re-investigated over its entire composition range. The revised diagram includes two intermediate phases. Pd 4Zr 3...

Ultrasonic Measurement of Stress in Railroad Wheels

February 1, 1999

Author(s)

R E. Schramm

Acoustic birefringence is the relative change in sound velocity with polarized direction. While the effect is small (usually parts in 10 4), this is a useful...

Dislocation-Density Changes Upon Poling of Polycrystalline BaTiO₃

February 1, 1999

Author(s)

Davor Balzar, H M. Ledbetter, P W. Stephens, E T. Park, J L. Routbort

We report evidence for a significant increase of bulk dilocation density upon poling of polycrystalline BaTiO 3. The synchrotron high-resolution x-ray...

Voight Function Model in Diffraction-Line Broadening Analysis

February 1, 1999

Author(s)

Davor Balzar

Diffraction-line broadening routes are briefly reviewed. Both luboratory and synchrotron X-ray measurements of W and MgO showed that a Voigt function...

Ceramic Measures: News of the Ceramic Processing Characterization Consortium, February 1999

February 1, 1999

Author(s)

S Jahanmir

Newsletter, Ceramic Measures: News of the Ceramic Processing Characterization Consortium, February 1999, Vol. 3, Issue 1.

Coherent Splitting of Bose-Einstein Condensed Atoms With Optically Induced Bragg Diffraction

February 1, 1999

Author(s)

M M. Kozuma, Lu Deng, Edward W. Hagley, J Wen, R Lutwak, Kristian Helmerson, S L. Rolston, William D. Phillips

We exposed Bose-Einstein condensed sodium atoms to a traveling periodic optical potential and observed coherent splitting of the condensate due to Bragg...

A Molecular Dynamics Study of a Reversed-Phase Liquid Chromatography Model

February 1, 1999

Author(s)

J T. Slusher, Raymond D. Mountain

We describe a molecular dynamics simulation study of a model of the reverse-phase chromatographic system. The model consists of a slab of aqueous solvent...

Enthalpy Increment Measurements from 4.5 K to 350 K and the Thermodynamic Properties of the Titanium Silicide TiSi(cr)

February 1, 1999

Author(s)

Donald G. Archer, R J. Kematick, C E. Myers, A Agarwal, E J. Cotts

Enthalpy increments for TiSi(cr) were measured from 4.5 K to 350 K with an adiabatic calorimeter. A small anomaly, unknown origin, was detected between 5K and...

Structure and Spectroscopy of Metallo-Lactamase Active Sites

February 1, 1999

Author(s)

H S. Gilson, Morris Krauss

This study clarifies the relationship between the active-site geometry of the bimetallic enzyme, zinc-Β-lactamase, and the electronic spectra of the cobalt...

Mitochondrial Disease in Superoxide Dismutase 2 Mutant Mice

February 1, 1999

Author(s)

S Melov, P Coskun, M Patel, R Tuinstra, B Cottrell, A S. Jun, T H. Zastawny, M. Dizdaroglu, S I. Goodman, T Huang, H Miziorko, C J. Epstein, D C. Wallace

Oxidative stress has been implicated in many diseases. The chief source of reactive oxygen species (ROS) within the cell is the mitochondrion. We have...

Logarithmic SUMT Limits in Convex Programming

February 1, 1999

Author(s)

G P. McCormick, Christoph J. Witzgall

The limits of a class of primal and dual solution trajectories associated with the Sequential Unconstrained Minimization Technique (SUMT) are investigated for...

For 100 Years, Notched Bar Impact Testing Standards Have Yielded Widespread Benefits for Industry

February 1, 1999

Author(s)

M P. Manahan, Christopher N. McCowan, Thomas A. Siewert, J M. Holt

Without Standardization, the impact test has little meaning.

Electron-Impact Total Ionization Cross Sections of CF₄, C₂F₆, and C₃F₈

February 1, 1999

Author(s)

H Nishimura, W M. Huo, M A. Ali, Yong Sik Kim

Both theoretical and experimental electron-impact total ionization cross sections of CF 4, C 2F 6, and C 3F 8 are presented. The experimental cross sections...

Ab Initio Determination of the Structure of the Active Site of a Metalloenzyme: Metal Substitution in Phospotriesterase using Density Functional Methods

February 1, 1999

Author(s)

S A. Kafafi, Morris Krauss

A number of previous studies have determined that a metalloenzyme active site is inherently determined by the ligands and metal and only weakly perturbed by the...

Low Energy, Ion-Induced Electron and Ion Emission from Stainless Steel: The Effect of Oxygen Coverage and the Implications for Discharge Modeling

February 1, 1999

Author(s)

S. G. Walton, J. C. Tucek, R. Champion, Yicheng Wang

Absolute yields of electrons and negative ions resulting from positive ions impacting stainless steel have been determined as a function of impact energy for...

Experimental Study of the NaK (3 1PI) State

February 1, 1999

Author(s)

E Laub, J Huennekens, R K. Namiotka, Zeina J. Kubarych, I Prodan, J La civita, S Webb, I Mazsa

We report the results of an optical-optical double resonance experiment to determine the NaK (3 1PI) state potential energy curve. In the first step, a narrow...

Preparing Spectral Libraries of Chloroplast Components for a Raman Imaging and Microspectroscopy Study

January 30, 1999

Author(s)

B M. Allen, Anne L. Plant, E N. Lewis, P Colarusso

Raman imaging is a non-invasive vibrational spectroscopic technique that utilizes both Raman spectroscopy and optical microscopy. This technique allows one to...

Wear Induced Molecular Orientation in Ultra High Molecular Weight Polyethylene (UHMWPE) Measured by Soft X-Ray Adsorption

January 29, 1999

Author(s)

Daniel A. Fischer, S Sambasivan, M C. Shen, Stephen M. Hsu

Molecular orientation in ultra high molecular weight polyethylene (UHMWPE) when it is subjected to wear is important in understanding the basic wear processes...

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