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Displaying 47651 - 47675 of 73697

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

High-Resolution Frequency Standard at 1030 nm for Yb: YAG Solid-State Lasers

June 1, 2000
Author(s)
Jun Ye, L -. Ma, John L. Hall
A diode pumped solid-state YB:YAG laser has been stabilized to a high finesse cavity with an all-external servo loop. Ultrasensitive cavity enhanced frequency modulation spectroscopy has recovered a sub-Doppler acetylene overtone transition with a high

High-Resolution Infrared Spectrum of the Ring-Puckering Band, N 10 of Diborane

June 1, 2000
Author(s)
Walter J. Lafferty, J.- M. Flaud, R L. Sams, Thomas A. Blake, S W. Sharpe
The spectrum of the Ņ 10 band of diborane, arising from the ring puckering vibration, has been obtained with a spectral resolution of 0.0015 cm -1 in the region 275 to 400 cm -1. The spectrum of a sample enriched in 10B was recorded as well as one with

Ideal Gases in Time-Dependent Traps

June 1, 2000
Author(s)
G M. Bruun, Charles W. Clark
We investigate theoretically the properties of an ideal trapped gas in a time-dependent harmonic potential. Using a scaling formalism, we are able to present exact analytical results for two important classes of experiments: free expansion of the gas upon

In-Situ Observation of Small-Angle X-Ray Scattering by Dislocations

June 1, 2000
Author(s)
Lyle E. Levine, Gabrielle G. Long, R Thomson
Ultra-small-angle X-ray scattering by dislocations in single-crystal aluminum has been observed in situ as a function of plastic deformation. The scattering is observed to be strongly dependent upon sample orientation, with single dislocations, dislocation

Intelligent Control for Unmanned Vehicles

June 1, 2000
Author(s)
Karl Murphy, Marilyn N. Abrams, Stephen B. Balakirsky, David Coombs, Tsai Hong Hong, Steven Legowik, Tommy Chang, Alberto Lacaze
Mobility, Unmanned Systems, Vision, Robotics & Intelligent Systems

Interacting Atoms Under Strong Quantum Confinement

June 1, 2000
Author(s)
Eite Tiesinga, Carl J. Williams, F H. Mies, Paul S. Julienne
We calculate the energy level shifts of a tightly-confined trapped alkali atom in the presence of a second trapped atom. A complete microscopic description of the interaction energy between the two atoms is used. This allows us to study tightly-confined

Is 'Implementation Implies Specification' Enough?

June 1, 2000
Author(s)
Paul E. Black
An implementation is typically checked against a specification by proving that the implementation implies the specification. This ensures that the implementation only has behaviors allowed by the specification. However, this does not require the

Is a Production Level Scanning Electron Microscope Linewidth Standard Possible?

June 1, 2000
Author(s)
Michael T. Postek, Andras Vladar, John S. Villarrubia
Metrology will remain a pricipal enabler for the development and manufacture of future generations of semiconductor devices. With the potential of 130 nm and 100 nm linewidths and high aspect ratio structures, the scanning electron microscope (SEM) remains
Displaying 47651 - 47675 of 73697
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