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Displaying 48076 - 48100 of 74141

Convective and Morphological Instabilities During Crystal Growth

June 1, 2000
Author(s)
Sam R. Coriell, Geoffrey B. McFadden, B T. Murray
We have studied the effects of interface morphology on the dynamics of dendritic growth. The Ivantsov solution for an isothermal paraboloid of revolution growing into a pure, supercooled melt provides a relation between the bulk supercooling and a

Coplanar-Waveguide-to-Microstrip Transition Model

June 1, 2000
Author(s)
Wojciech Wiatr, Dave K. Walker, Dylan Williams
We develop a novel four-port equivalent circuit for a coplanar-waveguide-to-microstrip transition using a finite-difference time-domain analysis. The lumped model accounts for mutual inductive coupling and works well up to about 30 GHz.

Correlation of the optical gap of (Ba,Sr)yTiO 2+y thin films with film composition

June 1, 2000
Author(s)
L D. Rotter, Mark D. Vaudin, John E. Bonevich, Debra L. Kaiser, S 0. Park
A series of (Ba 1-x,Sr x)yTiO 2+y films with a wide range of y and x < 0.07 was grown by metalorganic chemical vapor deposition. The composition of the films was determined by wavelength dispersive x-ray spectrometry. Transmission spectra were measured and

Critical Issues in the Characterization of Polymers for Medical Applications

June 1, 2000
Author(s)
Walter G. McDonough, Eric J. Amis, J Kohn
On June 14, 2000, the New Jersey Center for Biomaterials and the Polymers Division of the National Institute of Standards and Technology (NIST) co-sponsored a one-day workshop on Critical Issues in the Characterization of Polymers for Medical Applications

Evolution and Multidisciplinary Frontiers of C-14 Aerosol Science

June 1, 2000
Author(s)
Lloyd A. Currie
A review is given of some critical events in the development of radiocarbon aerosol science, and the profound influence of radiocarbon accelerator mass spectrometry (AMS) on its current applications and future prospects. The birth of this discipline

Extended Frequency Range Dielectric Measurements of Thin Films

June 1, 2000
Author(s)
F I. Mopsik
A method is described to measure the dielectric constant and loss of thin films. It employs a sample holder based on precision 50 {ohm} air line and can be used from audio frequencies to 1 GHz with a single sample. It is shown to maximize the precision

Flammability Assessment Methodology for Mattresses (NISTIR 6497)

June 1, 2000
Author(s)
Thomas J. Ohlemiller, John R. Shields, Roy A. McLane, Richard G. Gann
This study addresses the fire behavior of bed assemblies, including a mattress, foundation and bedclothes. The focus is on development and application of a reproducible means of simulating the thermal impact which burning bedclothes materials impose on a

Flux Pinning of Bi 2 Sr 2 CaCu 2 O 8+g /Ag Superconductors Utilizing (Sr,Ca) 14 Cu 24 O 41 Defects and Nanophase Al 2 O 3 and Au Particles

June 1, 2000
Author(s)
T J. Haugan, Winnie K. Wong-Ng, Lawrence P. Cook, H J. Brown, L Swartzendruber, D T. Shaw
Investigations into flux pinning of Bi 2Sr 2 CaCu 2O 8+γ /Ag (Bi-2212/Ag) thick film conductors utilizing micron-sized (Sr,Ca) 14Cu 24O 41 and nanophase Al 2O 3 and Au particles are described. Addition of defect particles delayed and reduced formation of

Green's Function for Steady-State Heat Conduction in a Bimaterial Composite Solid

June 1, 2000
Author(s)
J R. Berger, J L. Skilowitz, Vinod K. Tewary
The derivation of a Green's function for steady-state heat conduction in anisotropic bimaterials is presented. The Green's function is obtained through a Fourier representation to obtain both free-space, singular parts and region-dependent, regular parts
Displaying 48076 - 48100 of 74141
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