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Search Publications

NIST Authors in Bold

Displaying 41001 - 41025 of 73697

Patterned Loading of a Bose-Einstein Condensate Into an Optical Lattice

May 1, 2003
Author(s)
S P. Peil, James V. Porto, B L. Tolra, J Obrecht, B E. King, M Subbotin, S L. Rolston, William D. Phillips
We have developed a technique to control the placement of atoms in an optical lattice by using a superlattice comprising two separately manipulated, periodic optical potentials with commensurate periods. We demonstrate selective loading of Bose-condensed

Phase Field Modelling of Alloy Polycrystals

May 1, 2003
Author(s)
James A. Warren, I Loginova, L Granasy, T Borzsonyi, T Pusztai
Recent results using a phase field model of polycrystalline alloy dynamics are presented, using two numerical techiques: adaptive grids and parallel grids. The growth of alloy dendrites, and their subsequent impingement to form grain boundaries is

PIV Measurements in a Droplet-Laden Homogeneous Turbulent Flow Over a Cylinder

May 1, 2003
Author(s)
Cary Presser, G Papadopoulos, J F. Widmann
The dispersal of high boiling point liquid fire suppression agents around solid obstacles is investigated to obtain a better understanding of the physical processes of droplet transport in cluttered spaces. To this end, the present experimental

Quantum Computer Architecture Using Nonlocal Interactions

May 1, 2003
Author(s)
G K. Brennen, D Song, Carl J. Williams
Several authors have described the basic requirements essential to building a scalable quantum computer. Because many physical implementation schemes for quantum computing rely on nearest neighbor interactions, there is a hidden quantum communication

Quantum-Computer Architecture Using Nonlocal Interactions

May 1, 2003
Author(s)
G K. Brennen, D Song, Carl J. Williams
Many protocols for quantum information processing use a control sequence or circuit of interactions between qubits and control fields wherein arbitrary qubits can be made to interact with one another. The primary problem with many ''physically scalable

Radiometric Measurement Comparison on the Integrating Sphere Source Used to Calibrate the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Landsat 7 Enhanced Thematic Mapper Plus (ETM+)

May 1, 2003
Author(s)
James J. Butler, Steven W. Brown, Robert D. Saunders, B. Carol Johnson, S F. Biggar, E F. Zalewski, B L. Markham, P N. Gracey, J B. Young, R Barnes
As part of a continuing effort to validate the radiometric scales assigned to integrating spheresources used in the calibration of Earth Observing System (EOS) instruments, a radiometric measurement comparison was held in May 1998 at Raytheon/Santa Barbara

Reference Material 8457, Ultra High Molecular Weight Polyethylene 0.5 cm Cubes

May 1, 2003
Author(s)
B M. Fanconi, J A. Tesk, William F. Guthrie
The geometric and surface features of a new NIST reference material, RM 8457 are presented. This reference material is composed of Ultra High Molecular Weight Polyethylene (UHMWPE) in the form of 5 mm cubes. These cubes are intended for use in swelling

Relating Fresh Concrete Viscosity Measurements From Different Rheometers

May 1, 2003
Author(s)
Chiara F. Ferraris, Nicos Martys
The rheological properties of concrete need to be measured and predicted to enable the characterization of special concrete such as self-consolidating concrete (SCC). It was also shown by a round-robin held in 2000 [ , ] that different rheometers give a

Shielding Effectiveness Measurements of Materials in Nested Reverberation Chambers

May 1, 2003
Author(s)
Christopher L. Holloway, David A. Hill, John M. Ladbury, Galen H. Koepke, R. Garzia
In this paper, we present a technique for determining the shielding effectiveness of materials from nested reverberation chamber measurements. The new approach accounts for both aperture and cavity size effects. Various examples are presented to illustrate

Simulation of Droplet Breakup Using a Lattice Boltzmann Method

May 1, 2003
Author(s)
Frederick R. Phelan Jr., Nicos Martys
Droplet breakup in homogeneous shear flow at super critical Capillary numbers and a viscosity ratio of unity is studied using a lattice Boltzmann method. We find that the total number of child drops that form from an isolated super critical drop scales

Simulation of Heat Exchangers of a Window Air Conditioner Retrofitted with R-407C

May 1, 2003
Author(s)
S Devotta, A S. Padalkar, N K. Sane, Piotr A. Domanski, N N. Sawant
This paper presents the results of simulation of heat exchangers of an HCFC-22 window air conditioner retrofitted with R-407C. The test conditions considered are as per the Indian Standard IS 1391 (1992) for unitary air conditioners. The simulation has

Single-Stage Sub-Doppler Cooling of Alkaline Earth Atoms

May 1, 2003
Author(s)
X Xu, T Loftus, J W. Dunn, C H. Greene, John L. Hall, Alan Gallagher, Jun Ye
We report the first experimental study of sub-Doppler cooling in alkaline earth atoms ( 87Sr) enabled by the presence of nuclear spin-oriented magnetic gedeneracy in the atomic ground state. Sub-Doppler cooling in a ς +-ς - configuration is achieved

Structural Collapse Fire Tests: Single Story, Ordinary Construction Warehouse

May 1, 2003
Author(s)
D W. Stroup, Daniel M. Madrzykowski, William D. Walton, W H. Twilley
Two fire tests were conducted in a warehouse located in Phoenix, Arizona to develop data for evaluation of a methodology for predicting structural collapse. A firewall was constructed to divide the warehouse into two fire compartments. Temperatures were

Superconformal Silver Deposition using KSeCn Derivatized Substrates

May 1, 2003
Author(s)
B C. Baker, C Witt, Daniel Wheeler, Daniel Josell, Thomas P. Moffat
Superconformal filling of sub-micrometer trenches was achieved using substrates that were catalyzed with KSeCn prior to metal deposition in a catalyst-free, silver-cyanide electrolyte. The degree of superfill was found to be dependent on the time the

Suppression Limits of Low Strain Rate Non-Premixed Methane Flames

May 1, 2003
Author(s)
Matthew F. Bundy, Anthony P. Hamins, Ki Y. Lee
The suppression of low strain rate non-premixed flames was investigated experimentally in a counterflow configuration for laminar flames with minimal conductive heat losses. This was accomplished by varying the velocity ratio of fuel to oxidizer to adjust

Technical Aspects of the Digital Library of Mathematical Functions

May 1, 2003
Author(s)
Bruce R. Miller, Abdou S. Youssef
The NIST Digital Library of Mathematical Functions (DLMF) Project, begun in 1997, is preparing a handbook and Web site intended for wide communities of users. The contents are primarily mathematical formulas, graphs, methods of computation, references, and
Displaying 41001 - 41025 of 73697
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