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NIST Authors in Bold

Displaying 47351 - 47375 of 73970

Cold Collision Frequency Shifts in a 87 Rb Atomic Fountain

October 1, 2000
Author(s)
Y Sortais, S Bize, C Nicolas, A Clairon, C Salomon, C Williams
We present measurements of cavity frequency pulling and collisional frequency shifts in a 87Rb fountain with a frequency resolution of 3 x 10 -16. Agreement with theory is found for the cavity pulling and the measured collisional shifts. The clock shift is

Color Issues of White LEDs

October 1, 2000
Author(s)
Yoshihiro Ohno
For white LEDs to be used for general lighting, they should have appropriate white color and good color rendering performance for illuminated objects. Color rendering, as well as energy efficiency (efficacy), have been the two most important criteria for

Comparison of Optical-Power Meters Between the NIST and the PTB

October 1, 2000
Author(s)
Igor Vayshenker, Holger Haars, John H. Lehman, David J. Livigni
We describe the results of a comparison of optical-power meters undertaken by the National Institute of Standards and Technology (NIST, USA) and the Physikalisch-Technische Bundesanstalt (PTB, Germany) at nominal wavelengths of 1300 nm and 1550 nm. Both

Comparison of Reference Standards for Measurements of Optical-Fibre Power

October 1, 2000
Author(s)
S. V. Tikhomirov, A. I. Glazov, M. L. Kozatchenco, V. E. Kravtsov, A. B. Svetlichny, Igor Vayshenker, Thomas Scott, Douglas L. Franzen
National reference standards for determining optical-fibre power maintained by the National Institute of Standards and Technology (NIST, USA) and the All-Russian Research Institute for Optophysical Measurements (VNIIOFI, Russian Federation) were compared

Contact-Pad Design for High-Frequency Silicon Measurements

October 1, 2000
Author(s)
Dylan Williams, A. C. Byers, V. C. Tyree, Dave K. Walker, J. J. Ou, X. Jin, M. Piket-Moy, C. Hu
We measure and compare the electrical parasitics of contact pads of different designs fabricated on silicon integrated circuits and develop a strategy for reducing the parasitics.

Continuous Wave Laser Radiometry Project

October 1, 2000
Author(s)
Daryl Myers, Christopher L. Cromer
The objective of the Continuous Wave (CW) Laser Radiometry project is to develop measurement methods and standards for characterizing laser sources and detectors used primarily with CW radiation. The project will develop and maintain measurement services

Detection of the BCS Transition of a Trapped Fermi-Gas

October 1, 2000
Author(s)
G M. Bruun, Charles W. Clark
We investigate theoretically the properties of a trapped gas of fermionic atoms both in the normal and the superfluid phase. A detailed analysis including the shell structure of the normal phase spectrum exactly, leads to the proposal of two observables

Development of a Linear Motor Drive Testbed and Initial Thermal Behavior Results

October 1, 2000
Author(s)
Kari K. Harper, Bradley N. Damazo, M A. Donmez
The machine tool industry is moving toward using linear motors for both conventional and high speed machine tools due to many advantages: low maintenance, faster assembly times (compared with the more conventional ball screw drives), and improvements in

Dimensional Metrology of Millimeter- and Sub-millimeter-scale Components

October 1, 2000
Author(s)
Theodore V. Vorburger, Jun-Feng Song, Joseph Fu, M Tundermann, Thomas Brian Renegar, Theodore D. Doiron, N G. Orji
Decreasing sizes and tolerances of engineering components bring a demand for decreasing uncertainty in the dimensional measurements of these parts. Hence there is increasing need for measuring machines capable of performing dimensional and geometrical

Driving Autonomously Offroad up to 35 km/h

October 1, 2000
Author(s)
David Coombs, Karl Murphy, Alberto Lacaze, Steven Legowik
A robotic HMMWV (a.k.a. "humvee") drives autonomously offroad at speeds up to 35 km/h (10 m/s, 20 mph). Key features of the implementation that enable driving at these speeds are (1) planning the next 20 m with dynamically feasible trajectories, and (2)

Electrical Properties of Biological Materials: A Bibliographic Survey

October 1, 2000
Author(s)
Ken L. Stricklett, J. Baker
A bibliographic survey of the electrical properties of biological tissues and of phantoms is provided. A phantom is, for these purposes, any material, structure, or system that is intended to emulate the electrical properties of biological tissues

Electro-Optic Kerr Effect in Spun High-Birefringent Fiber Current Sensors

October 1, 2000
Author(s)
Allen Rose, P. G. Polynkin, J. Blake
We have measured the influence of the electro-optic (EO) Kerr effect on the response of a spun high-birefringence (hi-bi) fiber current sensor in a simulated Gas Insulated System (GIS) environment. We show that the EO Kerr effect distorts the response of

Electron Collision Data for Plasma-Processing Gases

October 1, 2000
Author(s)
Loucas G. Christophorou, James K. Olthoff
Low-temperature plasma applications require detailed understanding of the physical and chemical processes occurring in the plasmas themselves. For instance, as the push for smaller feature sizes and higher quality devices in the semiconductor industry has

Electron Interactions with Excited Atoms and Molecules

October 1, 2000
Author(s)
Loucas G. Christophorou, James K. Olthoff
Elastic, inelastic, and superelastic scattering of electrons by and electron-impact ionization of excited atoms are reviewed and discussed and the role of the electric dipole polarizabilty in the interaction of slow electrons with excited atoms is
Displaying 47351 - 47375 of 73970
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