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NIST Authors in Bold

Displaying 47926 - 47950 of 73697

Dielectric Measurements of Substrates and Packaging Materials

April 1, 2000
Author(s)
James R. Baker-Jarvis, Billy F. Riddle
We summarize measurement results on many polymer, ceramic, and composite substrate and packaging materials. Measurements on low-loss materials are obtained from closed and open cavity resonators, as well as dielectric-resonator methods. Measurements of the

Differential Surface Stress of a Tin Oxide Electrode

April 1, 2000
Author(s)
Gintaras Valincius, Vytautas Reipa
Differential surface stress measurements performed using estance technique and simultaneous measurements of the differential capacitance provide experimental evidence for deviation of n-tin oxide electrode's properties from the electrocapillary

Droplet Vorticity Alignment in Model Polymer Blends

April 1, 2000
Author(s)
Kalman D. Migler
The shear induced deformation of polymeric droplets in an immiscible polymeric matrix reveals that under conditions of high droplet elasticity, the droplets can align in the vorticity direction. We consider the case where the viscosity ratio of the two

Dye Impregnation Method for Revealing Machining Crack Geometry

April 1, 2000
Author(s)
Yasumitsu Matsuo, M. Sando, L K. Ives, Ryna B. Marinenko, George D. Quinn
An observation technique for machining cracks in ceramics has been developed. Palladium (Pd) nitrate water solution was impregnated into a bending specimen using cold isostatic pressing. Following a failure test, crack geometry was determined from a Pd

Dynamic Structure Factor of Diamond and LiF Measured Using Inelastic X-Ray Scattering

April 1, 2000
Author(s)
W A. Caliebe, J A. Soininen, Eric L. Shirley, C C. Kao, K Hamalainen
The dynamic structure factors S(q,ω) of diamond and LiF have been measured using inelastic x-ray scattering. The experimental data are compared to results of ab initio calculations, which take into account the interaction of the excited electron with the

Evaporative Cooling of a Two-Component Degenerate Fermi Gas

April 1, 2000
Author(s)
M J. Holland, B. L. DeMarco, Deborah S. Jin
We derive a quantum theory of evaporative cooling for a degenerate Fermi gas with two constituents and show that the optimum cooling trajectory is influenced significantly by the quantum statistics fo the particles. The cooling efficiency is reduced at low

Flow Calibration Services at NIST

April 1, 2000
Author(s)
John D. Wright, Pedro I. Espina
The Fluid Flow Group of the National Institute of Standards and Technology in Gaithersburg, Maryland offers calibration services for flow meters used in gas, water, and liquid hydrocarbon. Gas flow meters are calibrated using PVTt systems, piston provers

GAMS5

April 1, 2000
Author(s)
C Doll, H G. Borner, T von Egidy, H Fujimoto, M Jentschel, H Lehmann

Growth Model for Filamentary Streamers in an Ambient Field

April 1, 2000
Author(s)
H A. Fowler, J E. Devaney, John G. Hagedorn
We have simulated the fast streamer stage of liquid dielectric breakdown as stochastic growth of a branching fractal tree. Breakdown and threshold properties of the fluid are represented in the random filter procedure. A range of fractal densities, from

High Pressure Gas-Coupled Ultrasonic Inspection for Discontinuities

April 1, 2000
Author(s)
R E. Schramm, C M. Fortunko
A liquid couplant is usually necessary between the transducer and the specimen for ultrasonic crack detection and thickness gaging. This work demonstrates the possibility of using pressurized gas as the couplant for noncontact inspection. Historically

Hydrogenated amorphous silcon germanium Alloys Grown by the Hot-Wire Chemical Vapor Deposition Technique

April 1, 2000
Author(s)
B P. Nelson, Y Xu, D L. Williamsons, B von Roedern, A Mason, S Heck, A. H. Mahan, S F. Schmitt, Alan Gallagher, J Webb, R C. Reedy
We successfully grow high quality hydrogenated amorphous-silicon germanium alloys(a: SiGe:II) by the hot-wire chemical vapor deposition (HWCVD) technique using silane and germane gas mixtures. These alloys display electronic properties as good as those

Intercomparison of Visual Diffuse Transmission Density Measurements

April 1, 2000
Author(s)
Egbert Buhr, Detleff Bergmann, E A. Early, Thomas R. O'Brian
An intercomparison of visual diffuse transmission density measurements of photographic and x-ray film step tablets was completed bytwo national metrology institutes, the National Institute of Standards and Technology, USA, and the Physikalisch-Technische

Laboratory Primary Standards

April 1, 2000
Author(s)
John D. Wright
Commonly used primary calibration techniques for the measurement of liquid and gas flows are described. The techniques described include: static gravimetric and dynamic gravimetric methods for both gases and liquids, liquid piston displacement provers

MALDI-TOF MS Analysis of a Library of Polymerizable Cyclodextrin Derivatives

April 1, 2000
Author(s)
Rafael L. Bowen, M Farahani, Sabine H. Dickens, Charles M. Guttman
Polymerizable cyclodextrin derivatives (PCDs) have been proposed as candidates for use in dental therapeutics (Bowen, 1996 and Bowen and Reed, 1997). Here PCD libraries were synthosized by quasi-random reactions of 6 moles of methacrylic anhydride plus 7
Displaying 47926 - 47950 of 73697
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