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Displaying 41276 - 41300 of 73970

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

Test Structures for Referencing Electrical Linewidth Measurements to Silicon Lattice Parameters Using HRTEM

May 1, 2003
Author(s)
Richard A. Allen, B A. am Ende, Michael W. Cresswell, Christine E. Murabito, T J. Headley, William F. Guthrie, Loren W. Linholm, Colleen E. Hood, E. Hal Bogardus
A technique has been developed to determine the linewidths of the features of a prototype reference material for the calibration of CD (Critical-Dimension) metrology instruments. The reference features are fabricated in mono-crystalline-silicon with the

The Alternating Direction Implicit (ADI) Formulation of the Finite-Difference Time-Domain (FDTD) Method: Algorithm and Material Dispersion Implementation

May 1, 2003
Author(s)
Shawn W. Staker, Christopher L. Holloway, Alpesh Bhobe, Melinda Piket-May, Tobin A. Driscoll
The ADI-FDTD technique is an unconditionally stable time-domain numerical scheme, allowing the Δ}t time step to be increased beyond the Courant-Friedrichs-Lewy (CFL) limit. Execution time of a simulation is inversely proportional to Δ}t, and as such

The Customer Speaks: How the Users See the NIST Research Library

May 1, 2003
Author(s)
Barbara P. Silcox, P J. Deutsch
The Research Advisory Committee (RAC) at the National Institute of Standards and Technology (NIST) in its 2000 Annual Report to the NIST Director expressed concern that the NIST Research Library would not be able to meet the research needs of the

The ebXML Test Framework and the Challenges of B2B Testing

May 1, 2003
Author(s)
J Durand, Michael J. Kass, P Wenzel
Testing tools for Conformance and Interoperability are emerging as a key technology for enabling and maintaining interoperability between e-Business partners. Verifying adherence to a common standard (conformance) is just the first step. In addition, it is

The Effect of Delay Mismatch in MPLS Networks Using 1+1 Protection

May 1, 2003
Author(s)
David W. Griffith, Sanghun Lee, L Krivulina
High-capacity optical-fiber backbone networks protect information flows belonging to their premium customers by routing two copies of the customer's data over disjoint paths. This scheme, known as 1+1 protection, ensures that the customer will experience

The Eleventh Text REtrieval Conference (TREC-11)

May 1, 2003
Author(s)
Ellen M. Voorhees, Donna K. Harman
The Eleventh Text Retrieval Conference was held in Gaithersburg, Maryland, November 19-22, 2002. TREC 2002 is the latest in a series of workshops designed to foster research in information retrieval and related tasks. This year's conference consisted of

The IEEE Standard on Transitions, Pulses, and Related Waveforms, Std-181

May 1, 2003
Author(s)
Nicholas Paulter, Donald R. Larson, Jerome J. Blair
The IEEE has revised the now withdrawn IEEE standards on pulse techniques and definitions. This revision includes adding and deleting definitions, clarifying existing definitions, providing examples of different waveform types, updating text to reflect

Three Dimensional Phase Field Modeling of Binary Eutectics

May 1, 2003
Author(s)
D J. Lewis, William J. Boettinger, James A. Warren
A multi-phase field model was used to study the three-dimensional dynamics of morphology evolution in binary eutectics. Performing the calculations in three dimensions enables the study of the transition from rod-like to lamellar morphology and the study
Displaying 41276 - 41300 of 73970
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