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NIST Authors in Bold

Displaying 30151 - 30175 of 73697

Transport of Atoms in a Quantum Conveyor Belt

October 16, 2008
Author(s)
A Browaeys, H H ffnert, C R. McKenzie, S L. Rolston, Kristian Helmerson, William D. Phillips
We have performed experiments using a 3D-Bose-Einstein condensate of sodium atoms in a 1D optical lattice to explore some unusual properties of band-structure. In particular, we investigate the loading of a condensate into a moving lattice and find non

Trimmed Weighted Means

October 16, 2008
Author(s)
James H. Yen
In many situations, weighted means can achieve much lower variances than unweighted means by placing more weight on those observations that are more precise. However, that weighted means can be dominated by one or two observations with very large weights

Tunable Optical Properties of Icosahedral, Dodecahedral and Tetrahedral Clusters

October 16, 2008
Author(s)
Rui-Hua Xie, Garnett W. Bryant, J Zhao, T Kar, V H. Smith
Using time-dependent density functional theory, we show that the first singlet excitations of a series of icosahedral, dodecahedral and tetrahedral clusters are optically forbidden and that their optical absorption gaps and spectral properties are size-

Two-Loop Bethe Logarithms for non-S Levels

October 16, 2008
Author(s)
Ulrich D. Jentschura
Two-loop Bethe logarithms are calculated for excited P and D states in hydrogenlike systems, and estimates are presented for all states with higher angular momenta. The obtained results complete our knowledge of the P and D energy levels in hydrogen at the

Two-Photon and EIT-Assisted Doppler Cooling in a Three-Level Cascade System

October 16, 2008
Author(s)
Giovanna Morigi, E Arimondo
Laser cooling processes are theoretically investigated for a cascade scheme where the upper state decays more slowly than the intermediate one. A laser coupling to the upper transition modifies the scattering cross section, such that its action results in

Type Evaluation Laboratory Quality Manual Template

October 16, 2008
Author(s)
Gloria Diane Lee
This NISTIR is a Quality Manual Template designed to assist U.S. type evaluation laboratories document their laboratory quality system in accordance with the requirements of ISO 17025

U.S. Conformity Assessment Body Survey 2001

October 16, 2008
Author(s)
J S. Dhillon
NIST is a designating authority under two government-to-government agreements on the mutual recognition of conformity assessment results in regulated sectors. As such, NIST is responsible for designating U.S. conformity assessment bodies that are competent

Ultrasonic Measurement of Stress Using a Rotating EMAT

October 16, 2008
Author(s)
A V. Clark, C S. Hehman, Thao D. Nguyen
The acoustic birefringence method is primarilly used to measure differences of principal stresses in regions where principal stresses coincide with material symmetry axes. To determine the differences of principal stresses also requires knowledge of the

Uncertainties in Relative Spectral Data

October 16, 2008
Author(s)
J L. Gardner
Relative measurements of a series of data, either as a function of wavelength or angle, are common in radiometry. Normalization of these data at some reference point introduces correlations that must be considered when propagating uncertainties through a

uses of Small Particle Growth in Silane Discharges

October 16, 2008
Author(s)
G Bano, K Rozsa, Alan Gallagher
Silicon-based particles that grow in a silane radio frequency (RF) discharge are studied by light scattering. Average particle size and the corresponding particle density are measured as functions of silane density, RF voltage, and chamber temperature (t)

Using Outcome Tracking to Plan Our E-Journal Future

October 16, 2008
Author(s)
Barbara P. Silcox
This session will address how the NIST Research Library uses customer data to make collection development decisions. The presentation will briefly describe the survey instruments used and techniques employed to obtain input from NIST researchers on the

Validated Sheath Model for Radio-Frequency-Biased, High-Density Plasmas

October 16, 2008
Author(s)
Mark Sobolewski
A model is proposed for sheaths in high-density plasma discharges, with radio-frequency bias applied at frequencies (omega) comparable to (omega sub i), the ion plasma frequency at the edge of the sheath. The model treats ion dynamics using fluid equations
Displaying 30151 - 30175 of 73697
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