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Journals

Time-resolved Measurements of Ion Energy Distributions and Optical Emissions in Pulsed Radio-Frequency Discharges

March 1, 2000

Author(s)

Yicheng Wang, Eric C. Benck, Martin Misakian, M. Edamura, James K. Olthoff

In pulse-modulated inductively coupled plasmas generated in CF 4:Ar mixtures, a transition between a capacitive coupling mode (E mode) and an inductive coupling...

Failure Dynamics of the IGBT During Turn-Off for Unclamped Inductive Loading Conditions

March 1, 2000

Author(s)

Chien-Chung Shen, Allen R. Hefner Jr., David W. Berning, J B. Bernstein

The internal failure dynamics of the Insulated Gate Bipolar Transistor (IBGT) for unclamped inductive switching (UIS) conditions are studied using simulations...

Polymeric Silsesquioxanes: Degree-of-Intramolecular-Condensation Measured by Mass Spectrometry

March 1, 2000

Author(s)

William E. Wallace, Charles M. Guttman, Joseph M. Antonucci

The degree-of-condensation, defined as the number of residual silanol (SiOH) groups per oligomer, for a variety of silsesquioxane polymers was measured by...

Variance of Streaming Potential Measurements

February 18, 2000

Author(s)

M C. Wilbert, S Delagah, John Pellegrino

We evaluated sources of variance in the measurement of the surface streaming potential of flat sheet specimens of cellulose di/triacetate membranes with a...

A Comparison of the SSE-CMM and NVLAP IT Security Testing

February 16, 2000

Author(s)

R J. Medlock

This paper describes the general accreditation requirements of the NIST National Voluntary Laboratory Accreditation Program (NVLAP) and the specific...

A Stall Metric to Track Communication Performance

February 15, 2000

Author(s)

Alan Mink, Wayne J. Salamon, Michael D. Indovina

Probing the communication protocol stack in Linux PC-based clusters to investigate erratic TCP/IP performance has led to a new metric, data stream stall, which...

A Flexible High-Current Lead for Use in High-Magnetic-Field Cryogenic Enviroments

February 15, 2000

Author(s)

P Kirkpatrick, John (Jack) W. Ekin, S L. Bray

A flexible high-current lead for use at cryogenic temperatures and in high-magnetic fields has been developed using high purity aluminum.

Thermodynamics of Reactions Catalyzed by Anthranilate Synthase

February 14, 2000

Author(s)

W M. Byrnes, Robert N. Goldberg, Marcia J. Holden, M P. Mayhew, Yadu D. Tewari

Microcalorimetry and high performance liquid chromatography have been used to conduct a thermodynamic investigation of reactions catalyzed by anthranilate...

Dielectric Ceramic Materials

February 9, 2000

Author(s)

Richard G. Geyer

Accurate rf dielectric and magnetic characterization of ferrite ceramics requires combined measurement techniques.

Strengthening Composite Resin Restorations via Ceramic Whisker Reinforcement

February 1, 2000

Author(s)

Hockin D. Xu, Gary E. Schumacher, F Eichmiller, Joseph M. Antonucci

Due to their tendency to fracture, current composite for mulations are unsuitalbe for use in large stress-bearing direct posterior restorations that involve...

Lifetime-Limiting Strength Degradation From Contact Fatigue in Dental Ceramics

February 1, 2000

Author(s)

Yeon-Gil G. Jung, I M. Peterson, D H. Kim, Brian R. Lawn

Indentation damage and associated strength degradation from multi-cycle contacts with spherical indenters in water are evaluated in four dental ceramics, to...

Elastic Modulus by Resonance of Rectangular Prisms: Corrections for Edge Treatments

February 1, 2000

Author(s)

George D. Quinn, J Swab

Elastic Modulus is commonly measured by vibrating prismatic specimens at their natural frequency. The elastic modulus is calculated from the frequency, mass and...

Phase Relations of the SrO-Ho₂O₃-CuO_x System

February 1, 2000

Author(s)

Winnie K. Wong-Ng, J Dillingham, Lawrence P. Cook

The phase diagram of the SrO-R 2O 3-CuOx system, where R=Ho, was investigated in air. The tie-line relationships of this system were determined. Two ternary...

Octahedral Tilting and Cation Ordering in Perovskite-Like Ca₄Nb₂O₉ = 3 Center Dot Ca(Ca_1/3Nb_2/3)O₃ Polymorphs

February 1, 2000

Author(s)

Igor Levin, Leonid A. Bendersky, James P. Cline, Robert S. Roth, Terrell A. Vanderah

Four Ca 4Nb 2O 9 polymorphs with perovskite-related A(B' 1/3B 2/3)O 3 structures and different arrangements of B-site cations were identified and characterized...

Effect of Ag on the Primary Phase Field of High T_c (Bi,Pb)-2223 Superconductor

February 1, 2000

Author(s)

Winnie K. Wong-Ng, Lawrence P. Cook, W Greenwood, Anthony J. Kearsley

The subsolidus equilibria and the primary phase field (crystallization field) of the 110K high T c (Bi,Pb)-2223 ([Bi,Pb]:Sr:Ca:Cu) superconductor in the...

Ultracold Matter - Molecules at Rest

February 1, 2000

Author(s)

Carl J. Williams, Paul S. Julienne

In this issue (1), a group from the University of Texas reports producing rubidium dimers that are essentially at rest, by assembling them from ultracold Rb...

Rotational Spectra of Seven Conformational Isomers of 1-Hexene

February 1, 2000

Author(s)

Gerald T. Fraser, R D. Suenram, C Lugez

The rotational spectra of 7 of the expected 13 conformational isomers of 1-hexene have been measured and assigned at a rotational temperature of 1 symmetry, as...

Image Plates for Registration of Far-Ultraviolet Spectra

February 1, 2000

Author(s)

Joseph Reader, Craig J. Sansonetti, R Deslattes

We have tested an autoradiographic photostimulable phosphor image storage plate as a medium for recording spectra in the wavelength region from 50 to 550 and...

Plasma Charge-Density Ratios in a Dusty Plasma

February 1, 2000

Author(s)

M A. Childs, Alan Gallagher

It is shown that particle diffusion in the afterglow of a dusty plasma can be used to establish several properties of the active plasma. Specifically, the ratio...

Manipulation of Feshbach Resonances in Ultracold Atomic Collisions Using Time-Dependent Magnetic Fields

February 1, 2000

Author(s)

F H. Mies, Eite Tiesinga, Paul S. Julienne

We have calculated the time-dependent dynamics of two ultracold Na atoms in an atom trap where a time-dependent magnetic field B(t) moves a Feshbach resonance...

Small Particle Growth in Silane Radio-Frequency Discharges

February 1, 2000

Author(s)

M A. Childs, Alan Gallagher

Particle size and number density are measured versus discharge operating time in pure silane, capacitively-coupled RF discharges. Dischargeconditions are those...

Equation of State for Polymer Chains in Good Solvents

February 1, 2000

Author(s)

L L. Lue

A free-energy model is developed for polymer chains in good solvents. This model, which combines the ideas of polymer field theory with liquid-state theory, is...

Electrical Transport and Magnetic Properties of a Possible Electron-Doped Layered Manganese Oxide

February 1, 2000

Author(s)

Y Zhao, Y H. Li, S B. Ogale, M Rajeswari, V Smolyaninova, T Wu, A Biswas, L Salamanca-Riba, R L. Greene, R Ramesh, M Venkatesan, Jake H. Scott

In this paper, we report on the growth of La 067Sr 0.33MnO x thin films in vacuum using pulsed laser deposition and their structural, transport, and magnetic...

Biological Function Made Crystal Clear - Annotation of Hypothetical Proteins via Structural Genomics

February 1, 2000

Author(s)

Edward Eisenstein, G L. Gilliland, O Herzberg, J Moult, J Orban, R Poljak, L Banerjei, D Richardson, A J. Howard

Many of the gene products of completely sequenced organisms are hypothetical - they cannot be related to any previously characterized proteins - and so are of...

Sterochemical Outcome and Kinetic Effects of Rp and Sp-Phosphorothioate Substitutions at the Cleavage site of Vaccinia Type I DNA Topoisomerase

February 1, 2000

Author(s)

J T. Stivers, B Nawrot, J. Jagadeesh, W J. Stec, S Shuman

To probe the mechanism of the reversible DNA phosphodiester bond cleavage and religation mechanism of the type I topoisomerase from vaccinia virus, we have...

A Differentiated Optical Services Model for WDM Networks

February 1, 2000

Author(s)

Nada T. Golmie, T D. Ndousse, David H. Su

This paper addresses the issues of guaranteed and scalable end-to-end QoS in Metropolitan DWDM networks serving as transit networks for IP access networks. DWDM...

Why Pb(B_1/3B'_(2/3)) O₃ Perovskites Disorder More Easily than Ba(B_1/3B'_(2/3)) O₃ Perovskites and the Thermodynamics of (1:1)-Type Short-Range Order in PMN

February 1, 2000

Author(s)

Benjamin P. Burton

Fully relaxed, planewave pseudopotential calculations of formation energies (δE) were performed for ordered supercells in the perovskite based system (1 - X)...

Competition between intra- and intermolecular hydrogen bonding: Effect on para/ortho adsorptive selectivity for substituted phenols

February 1, 2000

Author(s)

A J. Glemza, K L. Mardis, Asad Chaudhry, M K. Gilson, G F. Payne

An Introduction to Evaluating Biometric Systems

February 1, 2000

Author(s)

P J. Phillips, Alvin F. Martin, Charles L. Wilson, Mark A. Przybocki

How and where biometric systems are deployed will depend on their performance. Knowing what to ask and how to decipher the answers can help you evaluate the...

Evaluation of Electron Inelastic Mean Free Paths for Selected Elements and Compounds

February 1, 2000

Author(s)

Cedric J. Powell, Aleksander Jablonski

We have performed an evaluation of calculated and measured electron inelastic mean free paths (IMFPs) for selected materials and for electron energies between...

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