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Search Publications

NIST Authors in Bold

Displaying 43501 - 43525 of 73697

NIST Stray Light Elimination Tube Prototype

March 1, 2002
Author(s)
Paul A. Boynton, Edward F. Kelley
Electronic projection displays involve the projection of an image, usually through a lens system, onto a viewing screen. Metrics such as light output, contrast, non-uniformity, and color gamut are used to describe the resultant image quality. although

Nonlinear and Quantum Atom Optics

March 1, 2002
Author(s)
S L. Rolston, William D. Phillips
Coherent matter waves in the form of Bose-Einstein condensates (BECs) have led to the development of non-linear and quantum atom optics, the deBroglie-wave analogs to non-linear and quantum optics with light. Four-wave mixing of matter waves and

Novel Fluorescence Method for Cure Monitoring of Photo-Cured Composites

March 1, 2002
Author(s)
K Komatsu, Francis W. Wang, K Nemoto
The mechanical properties of a composite resin depend greatly on the degree of its conversion. This study used a fluorescence monitoring system to investigate the dependence of the conversion of a photo-cured composite resin on its filler content. In this

Observations of Room Temperature Creep Recovery in Titanium Alloys

March 1, 2002
Author(s)
M Savage, T Neeraj, M J. Mills
Conventional α (hcp) and α (hcp)/Β (bcc) titanium alloys exhibit significant primary creep strains at room temperature and at stresses well below their macroscopic yield strength. It has been previously reported that repeated unloading during primary creep

Optical Trapping and Manipulation of Nano-Objects With an Apertureless Probe

March 1, 2002
Author(s)
P C. Chaumet, A Rahmani, M Nieto-Vesperinas
We propose a novel way to trap and manipulate nano-objects above a dielectric substrate using an apertureless near-field probe. A combination of evanescent illumination and light scatterig at the probe apex is used to shape the optical fields into a

Parallel Calculation of Electron Multiple Scattering Using Lanczos Algorithms

March 1, 2002
Author(s)
Charles E. Bouldin, A L. Ankudinov, J J. Rehr, James S. Sims, Howard Hung
Real space multiple scattering calculations of the elctronic density of states and x-ray spectra in solids typically scale as the cube of the system and basis set size, and hence are highly demanding computationally. For example, calculations near the Si K

Particle Formation in Laminar Flames Inhibited by Metals

March 1, 2002
Author(s)
Gregory T. Linteris, M D. Rumminger
Some organometallic compounds of iron are two orders of magnitude more effective at volume fraction than CF 3Br in premixed flames, an order of magnitude more effective in counterflow diffusion flames. The condensation of active gas-phase iron-containing

Photoassociation of Sodium in a Bose-Einstein Condensate

March 1, 2002
Author(s)
C R. McKenzie, J Denschlag, H Heffner, A Browaeys, L E. de Araujo, F K. Fatemi, Kevin Jones, J E. Simsarian, D Cho, A Simoni, Eite Tiesinga, Paul S. Julienne, Kristian Helmerson, Paul D. Lett, S L. Rolston, William D. Phillips
We report on the formation of ultra-cold Na2 molecules using single-photon photoassociation of a Bose-Einstein condensate. The photoassociation rate, linewidth and light shift of the J = 1, v = 135 vibrational level of the A^1)Sigma^+_u molecular bound

Planning Report 02-1: The Economic Impact of Role-Based Access Control

March 1, 2002
Author(s)
Michael P. Gallaher, Alan C. O'Connor, Brian Kropp, Gregory C. Tassey
The National Institute of Standards and Technology (NIST) began working on RBAC in the early 1990s after a study of federal agency security needs identified the need to develop a better method for managing large networked systems and complex access issues

Promoting Quality in Laboratory Testing

March 1, 2002
Author(s)
J H. Pielert
The Cement and Concrete Reference Laboratory (CCRL) provides laboratory inspection and proficiency sample programs that are used to evaluate testing laboratory competency. CCRL, which is sponsored by ASTM, along with the American Association of State

Quantum Efficiency of Spectral UV on Polyurethanes

March 1, 2002
Author(s)
Tinh Nguyen, Jonathan W. Martin, E Byrd, E Embree
Polyurethanes (PU) are used extensively as exterior building materials. However, PU undergoes degration during outdoor exposure. The quantum efficiency of spectral UV on photodegration of an acrylic-urethane coating has been investigated. Samples of

Quantum Encounters of the Cold Kind

March 1, 2002
Author(s)
K Burnett, Paul S. Julienne, Paul D. Lett, Eite Tiesinga, Carl J. Williams
Ultra cold atomic collisions have a broad impact in experimental and theoretical atomic physics. These encounters occur in a domain where the quantum mechanical aspects of the interacting particles are manifest, since the de Broglie wavelength is enormous

Radiocarbon Measurements of Black Carbon in Aerosols and Ocean Sediments

March 1, 2002
Author(s)
C A. Masiello, David L. Urban, Lloyd A. Currie
We report the optimization of dichromate-sulfuric acid oxidation for the measurement of radiocarbon in black carbon (BC). We also present comparisons of black carbon 14C measurements on NIST aerosol ( 14C measurements on NIST aerosol (Urban Dust) standard

Rare-Earth Garnets and Perovskites for Space-Based ADR Cooling at High T and Low H

March 1, 2002
Author(s)
T T. King, B A. Rowlett, R A. Ramirez, E R. Canavan, M J. DiPirro, J S. Panek, J G. Tuttle, Robert D. Shull, R A. Fry
Future NASA satellite detector systems must be cooled to the 0.1K temperature range to meet the stringent energy resolution and sensitivity requirements demanded by mid-term astronomy missions. The development of adiabatic demagnetization refrigeration

Reaction Kinetics of 2-Propanol Dehydration in Supercritical Water

March 1, 2002
Author(s)
V I. Anikeev, A Ermakova, Jeffrey A. Manion, Robert E. Huie
A study of the kinetics and mechanism of chemical reactions in supercritical fluids is considered. An experimental procedure was proposed for examining reversible chemical reactions in supercritical water. The reaction kinetics of 2-propanol dehydration in

Spontaneous Emission in Microcavity Electrodynamics

March 1, 2002
Author(s)
A Rahmani, Garnett W. Bryant
We present a general, semimicroscopic, self-consistent treatment of spontaneous emission for a two-level atom in a dielectric microcavity with arbitrary shape. Both lossless and absorbing media are considered. Our spherical and cubic cavities. We discuss

Standard Reference Material 1749: Au/Pt Thermocouple Thermometer

March 1, 2002
Author(s)
Dean C. Ripple, G W. Burns
Standard Reference Material (SRM) 1749 is a lot of 18 specially-constructed gold versus platinum (Au/Pt) thermocouple thermometers, each calibrated on the International Temperature Scale of 1990 (ITS-90) and supplied with integral lead wires and a
Displaying 43501 - 43525 of 73697
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