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Journals

Electron Transport, Ionization, and Attachment Coefficients in C₂F₄ and C₂F₄/Ar Mixtures

May 1, 2001

Author(s)

Amanda N. Goyettes, G. de Hann, Yicheng Wang, Loucas G. Christophorou, James K. Olthoff

This is a summary report of the paper to be published in the Journal of Chemical Physics. Measurements of electron transport, effective ionization, and...

Evolution of Morphology and Structure During Crystallization and Melting in Syndiotactic Polypropylene

May 1, 2001

Author(s)

Z G. Wang, B S. Hsiao, Charles C. Han

Structure and morphology development during isothermal crystallization and subsequent melting of syndiotactic polypropylene (sPP) was studied by time-resolved...

Nonempirical Analysis of the Nature of Catalytic Effects in Ribonuclease A Active Site

April 30, 2001

Author(s)

P Kedzierski, W A. Sokalski, Morris Krauss

The physical nature of the catalytic activity exerted by various ribonuclease A active site constituents is analyzed in terms of the differential transition...

Progress Under The Next Generation Fire Suppression Technology Program (NGP) In FY2000

April 26, 2001

Author(s)

Richard G. Gann

The Department of Defense's Next Generation Fire Suppression Technology Program (NGP) has completed its fourth year of research with a revised goal to develop...

Poly(ethylene-co-acrylic acid) Stationary Phases for the Separation of Shape-Constrained Isomers

April 15, 2001

Author(s)

J. Wegmann, K. Albert, M. Pursch, Lane C. Sander

Hybrid glass substrates for waveguide device manufacture

April 15, 2001

Author(s)

Samuel D. Conzone, Joseph S. Hayden, David S. Funk, Alexana Roshko, D. L. Veasey

Hybrid glass substrates composed of active (ER/Yb co-doped) and passive phosphate glass were prepared by a novel, low temperature joining process. The resulting...

High Precision Comparison Between SNS and SIS Josephson Voltage Standards

April 15, 2001

Author(s)

Blaise Jeanneret, Alain Rufenacht, Charles J. Burroughs

Recently, a new Josephson voltage standard based on a 1 V programmable chip provided by the National Institute of Standards and Technology (NIST) was...

Optoelectronic Device Performance on Reduced Threading Dislocation Density GaAs/Si

April 15, 2001

Author(s)

P. H. Taylor, W. A. Jesser, J. Bradshaw, M. Lara-Taysing, R. P. Leavitt, G. Simonis, W. Chang, W. W. Clark, Kristine A. Bertness

A technique for the heteroepitaxy of GaAs/Si films having reduced threading dislocation density is presented. The important attribute of this technique is the...

The Structure of the T127L/S128A Mutant of cAMP Receptor Protein Facilitates Promoter Site Binding

April 6, 2001

Author(s)

S. Chu, M. Tordova, G L. Gilliland, I Gorshkova, Y. Shi, S. Wang, Frederick P. Schwarz

The x-ray crystal structure of the cAMP-ligated T127L/S128A double mutant of cAMP receptor protein (CRP) was determined to a resolution of 2.2 . Although this...

Structure and Property Characterization of Low-k Dielectric Porous Thin Films

April 1, 2001

Author(s)

Barry J. Bauer, Eric K. Lin, V. J. Lee, Haonan Wang, Wen-Li Wu

High-resolution X-ray reflectivity and small angle neutron scattering measurements are used as complementary techniques to characterize the structure and...

In Order to Form a More Perfect UNION

April 1, 2001

Author(s)

Isabel M. Beichl, F Sullivan

In this computing prescription we present an algorithm for finding a minimum spanning tree figure 1 shows a typical application of this MST algorithm. Here we...

Conformance Testing and Certification Framework

April 1, 2001

Author(s)

Lisa J. Carnahan, Lynne S. Rosenthal, Mark Skall

This white paper presents the general concepts, components, and issues related to establishing and administering a conformance testing and certification program...

Java and Numerical Computing

April 1, 2001

Author(s)

Ronald F. Boisvert, J Moreira, M Philippsen, Roldan Pozo

We discuss the advantages and disadvantages of using Java for numerical computing. We provide examples of current performance levels and propose several...

Fatigue Resistant, High Temperature Solder

April 1, 2001

Author(s)

Frank W. Gayle

The National Center for Manufacturing Sciences (NCMS) High Temperature Fatigue Resistant Solder Project, carried out by a consortium of eight industrial...

NIR Applications for Measuring Water Sorption and Vinyl Unsaturation in Dental Dimethacrylate Polymers

April 1, 2001

Author(s)

Sabine H. Dickens, J W. Stansbury, C J. Floyd

Integrated near infrared (NIR) absorbance has been used to determine the absorptivity of the [nu] 2+[nu] 3 combination band of water in several organic solvents...

Application of a New Thermochemical Measurement Method for Nuclear Materials at Temperatures Beyond 3000k

April 1, 2001

Author(s)

John W. Hastie, D W. Bonnell, Peter K. Schenck

In processing and end-use environments, and particularly nuclear fission reactor excursions, inorganic materials can be subjected to temperatures where liquids...

Elastic Strain and Stress Determination by Rietveld Refinement: Generalized Treatment for Textured Polycrystals for all Laue Classes

April 1, 2001

Author(s)

N Popa, Davor Balzar

We propose a novel approach to model diffraction peak shifts caused by residual or applied stresses in textured polycrystals. The models yields the complete...

Effect of Flow Due to Density Change on Eutectic Growth

April 1, 2001

Author(s)

Sam R. Coriell, Geoffrey B. McFadden, William F. Mitchell, B T. Murray, J B. Andrews, Y B. Arikawa

The Jackson-Hunt model of eutectic growth is extended to allow for different densities of the phases. The density differences give rise to fluid flow which is...

Thermal Expansion of Supported Thin Polymer Films: A Direct Comparison of Free Surface vs. Total Confinement

April 1, 2001

Author(s)

D J. Pochan, Eric K. Lin, Sushil K. Satija, Wen-Li Wu

Neutron Reflectivity measurements on thin, deuterated polystyrene films reveal a strong dependence of the polymer melt coefficient of thermal expansion (CTE) on...

Thermodynamic and Structural Aspects of the Potential Energy Surface of Simulated Water

April 1, 2001

Author(s)

Francis W. Starr, Srikanth Sastry, E LaNave, A Scala, H E. Stanley, F Sciortino

Relations between the thermodynamics and dynamics of supercooled liquids approaching the glass transition have been propposed over many years. This connections...

Mechanical Properties of Ultra High Molecular Weight Polyethylene NIST Reference Material RM 8456

April 1, 2001

Author(s)

F Eichmiller, John A. Tesk, C M. Croarkin

A NIST Reference Material, RM 8456,was characterized for 184 bars of Ultra High Molecular Mass Polyethelene (UHMW) , each unit was 7.62 mm (3 in) in diameter...

Characterization of Symmetric Diblock Copolymers With High-Throughput Techniques

April 1, 2001

Author(s)

Alamgir Karim, A P. Smith, Jack F. Douglas, Eric J. Amis

Surface pattern formation in thin block copolymer films is investigated utilizing a high-throughput methodology by creating films having gradients in film...

Visualizing the Elimination of Sharkskin Through Fluoropolymer Additives: Coating and Polymer-Polymer Slippage

April 1, 2001

Author(s)

Kalman D. Migler, C LavallTe, M P. Dillon, S S. Woods, C L. Gettinger

We developed a capillary rheo-optics technique to visualize the mechanism by which fluoropolymer additives eliminate a distortion called sharkskin in the...

Phase Separation Induced by Shear Quenching in Polymer Blends With a Diblock Copolymer

April 1, 2001

Author(s)

H Jeon, Sangcheol Kim, Charles C. Han

The effects of adding A-B diblock copolymer to a polymer blend (A/B) on phase- separation kinetics and morphology have been investigated in a fixed shallow...

The Location of Very Small Particles in Silane RF Discharge

April 1, 2001

Author(s)

K Rozsa, G Bano, Alan Gallagher

The size and location of silicon particles that grow in a pure silane, capacitively coupled RF discharge, are measured by laser light scattering. The discharge...

Absolute Quantum Efficiency Measurements Using Correlated Photons: Toaward a Measurement Protocol

April 1, 2001

Author(s)

Alan L. Migdall

Correlated photons can be used to measure of the quantum efficiency of photon counting photodetectors without ties to any externally calibrated standards. We...

Collisional Frequency Shifts in ¹³³Cs Fountain Clocks

April 1, 2001

Author(s)

P J. Leo, Paul S. Julienne, F H. Mies, Carl J. Williams

We present a theoretical analysis of the pressure shift in Cs fountain clocks using the highly constrained binary collision model described by Leo et al. [Phys...

Precision Measurement of Wavelengths Emitted by a Molecular Fluorine Laser at 157 nm

April 1, 2001

Author(s)

Craig J. Sansonetti, Joseph Reader, K Vogler

The wavelengths of six spectral lines emitted by a molecular fluorine (F2) laser at 157 nm were measured to high accuracy with the 10.7-m normal-icidence vacuum...

The Location of Very Small Particles in Silane RF Discharges

April 1, 2001

Author(s)

K Rozsa, G Bano, Alan Gallagher

The size and location of silicon particles that grow in a pure silane, capacitively coupled rf discharge are measured by laser light scattering.The discharge...

Competition of Charge, Orbital, and Ferromagnetic Correlations in Layered Manganites

April 1, 2001

Author(s)

D B. Romero, Y Moritomo, J.F. Mitchell, H D. Drew

We investigated the competition of charge, orbital, and ferromagnetic interactions in layered manganites by magneto-Raman scattering spectroscopy. The charge...

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