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Displaying 29901 - 29925 of 73461

Thermophysical Properties of Chlorine from Speed-of-Sound Measurements

October 16, 2008
Author(s)
John J. Hurly
The speed of sound was measured in gaseous chlorine using a highly precise acoustic resonance technique. The data span the temperature range 260 K to 440 K and the pressure range 100 kPa to the lesser of 1500 kPa or 80 % of the sample's vapor pressure. A

Thickness Dependence of Magnetic Film Edge Properties in Ni 80 Fe 20 Stripes

October 16, 2008
Author(s)
Robert D. McMichael, C A. Ross, V P. Chuang
Measurements of trapped spinwave edge modes in transversely magnetized stripe arrays of Ni80Fe20 largely confirm pervious theoretical predictions for the thickness dependence of the edge saturation field Hsat and the effective out-of-plane edge anisotropy

Threading and Unthreading of Pseudorotaxanes of PEG/Acyclodextrin

October 16, 2008
Author(s)
Barry J. Bauer, Da-Wei Liu
The threading and unthreading kinetics of alpha-cyclodextrin onto polyethylene glycol is measured by small angle neutron scattering and gel permeation chromatography. The threading is autocatalytic, once threading of a PEG chain is started, it rapidly

Toward Optical Frequency Electronics

October 16, 2008
Author(s)
D J. Jones, S T. Cundiff
Recently, there have been significant advances in measuring and controlling the phase of ultrashort optical pulses. These developments have begun to blur the distinction between optics and electronics. In the latter it is possible to completely

Trace Explosive Detection Standards Using Drop-on-Demand Inkjet Printing Technology

October 16, 2008
Author(s)
Eric S. Windsor, Bruce A. Benner Jr., Robert A. Fletcher, J Greg Gillen, R Lareau, Inho Cho, Mike Boldmand
A piezoelectric drop-on-demand inkjet printer system has been used to prepare prototype trace explosive calibration materials to aid in the performance evaluation of ion mobility spectrometry instruments that are now widely deployed in support of homeland

Traceability in Nuclear Medicine

October 16, 2008
Author(s)
Brian E. Zimmerman, Steven Judge
Accurate, reproducible measurement of radioactivity in nuclear medicine applications is vital to ensuring the safety and effectiveness of disease diagnosis and treatment using unsealed radioactive sources. The need to maintain a high degree of confidence

Trade Agreements and Voluntary MrAs- An Update

October 16, 2008
Author(s)
M H. Saunders
In the past decade, a variety of voluntary mutual recognition arrangements (MRA's) have been concluded among peer organizations: accreditors of testing and calibration laboratories, accreditors of management system certifiers, and national measurement

Trainspotters Log Major Delays

October 16, 2008
Author(s)
Eric A. Cornell
Hau and her colleagues suggest that their newly demonstrated ability to control the flow of optical information may have technological relevance in the quantum information business.

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
Displaying 29901 - 29925 of 73461
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