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Displaying 42901 - 42925 of 74078

Confirmation of Interstellar Acetone

October 1, 2002
Author(s)
Lewis E. Snyder, Francis J. Lovas, David Mehringer, Nina Yanti Miao, Y J. Kuan, J M. Hollis
We present new observations of interstellar acetone [(CH3)(2) CO] from both the NRAO 12 m and the BIMA array. We report NRAO 12 m detections of 13 new acetone emission features that can be assigned to 20 acetone transitions. These assignments are based on

Cost Effective Use of Formal Methods in Verification and Validation Foundations

October 1, 2002
Author(s)
D. Richard Kuhn, Ramaswamy Chandramouli, R W. Butler
Formal methods offer the promise of significant improvements in verification and validation, and may be the only approach capable of demonstrating the absence of undesirable system behavior. But it is widely recognized that these methods are expensive, and

Cost Effective Uses of Formal Methods in Verification and Validation

October 1, 2002
Author(s)
D. Richard Kuhn, Ramaswamy Chandramouli
Formal methods offer the promise of significant improvements in verification and validation, and may be the only approach capable of demonstrating the absence of undesirable system behavior. But it is widely recognized that these methods are expensive, and

Dynamic Analysis of Sliding Contacts at Head-Disk Interface

October 1, 2002
Author(s)
Tze J. Chuang, Stephen M. Hsu
As magnetic data storage technology moves towards higher areal data density with higher rotational speeds and lower flying heights, the propensity of severe sliding contacts at the head-disk interface is bound to increase. The tribological performance of

Elastic Properties of Hardness Coatings Using Surface Acoustic Wave Spectroscopy

October 1, 2002
Author(s)
Donna C. Hurley, A J. Richards, Vinod K. Tewary, A Bendavid, P J. Martin
Surface acoustic wave (SAW) spectroscopy is a nondestructive way to determine the properties of thin films. Plane-wave SAWs are generated by a line-focused, pulsed laser and detected by a Michelson interferometer. Phase velocity dispersion relations over

Electromagnetic Coupling on an Atomic Scale

October 1, 2002
Author(s)
Javier Aizpurua, G Hoffman, S P. Apell, R Berndt
Light emission from a scanning tunneling microscope is used to investigatethe electromagnetic coupling (EMC) of a metal tip and a metal sample.Subatomic scale modifications of the tip-sample region cause spectralshifts of the fluorescence as demonstrated

Embedded Real-Time Linux For Cable Robot Control

October 1, 2002
Author(s)
Frederick M. Proctor, William P. Shackleford
Linux is a version of the Unix operating system distributed according to the open source model. Programmers are free to adapt the source code for their purposes, but are required to make their modifications or enhancements available as open source software

Finite Element and Plate Theory Methods for Modeling Acoustic Emission Waveforms

October 1, 2002
Author(s)
W H. Prosser, Marvin A. Hamstad, John M. Gary, Agnes O'Gallagher
A comparison was made between two approaches to predict acoustic emission waveforms in thin plates. A normal mode solution method for Mindlin plate theory was used to predict the flexural plate mode response to a point source, step-function load, applied

High Resolution Spectroscopic Studies of 1-(1-Naphthyl)ethylamine in S 0 and S 1 : Exploring the Dependence of Circular Dichroism on Conformational Structure

October 1, 2002
Author(s)
David F. Plusquellic, R J. Lavrich, T Petralli-Mallow, S Davis, T M. Korter, R D. Suenram
Rotationally-resolved spectra of gas-phase samples of 1-(1-naphthyl) -ethylarnine (NEA) and amine deuterated forms have been obtained in the microwave and ultraviolet regions, with the isotopomers initially prepared in their zero-pointvibrational levels by

Linear Spin Waves in a Trapped Bose Gas

October 1, 2002
Author(s)
T Nikuni, J E. Williams, Charles W. Clark
An ultra-cold Bose gas of two level atoms can be thought of as a spin-1/2 Bose gas. It supports spin wave collective modes due to the exchange mean field. Such collective spin oscillations have been observed in recent experiments at JILA with 87Rb

Living and Working with Ubiquitous Computing

October 1, 2002
Author(s)
Jean C. Scholtz
Today, much of our information-intensive work is carried out at desktop computer workstations; however, increasingly people work and live on the move. Very soon, scads of small information processing appliances will be carried along from place to place as

Low Scatter Optical System for Emittance and Temperature Measurements

October 1, 2002
Author(s)
Sergey Mekhontsev, Leonard M. Hanssen
The development and evaluation of an optical system for a new spectral directional emittance facility at NIST is reported. The imaging quality and signal contributions due to out-of-field-of-view scattering, commonly characterizedby the size-of-source

Measurement of the Zero Crossing in a Feshbach Resonance of Fermionic 6 Li

October 1, 2002
Author(s)
K M. O'Hara, S L. Hemmer, M E. Granade, M E. Gehm, J E. Thomas, V Venturi, Eite Tiesinga, Carl J. Williams
We measure a zero crossing in the scattering length of a mixture of the two lowest hyperfine states of 6Li. To locate the zero crossing, we monitor the decrease in temperature and atom number arising from evaporation in a CO2 laser trap as a function of
Displaying 42901 - 42925 of 74078
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