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Displaying 50201 - 50225 of 73697

Smoke Detector Response to Nuisance Aerosols

March 16, 1999
Author(s)
Thomas G. Cleary, William L. Grosshandler, Artur A. Chernovsky
The worth of a fire detector is determined as much by its ability not to respond to stimuli that are generated from non-threatening sources as to respond in a timely manner to an actual fire. Photo-electric and ionization smoke detectors react to a greater

A Progress Report on the NIST Convective Heat Flux Calibration Facility

March 15, 1999
Author(s)
David G. Holmberg, C A. Womeldorf
The National Institute of Standards and Technology has developed a convective heat flux calibration facility to allow evaluation of heat flux sensors. This facility is a small wind tunnel that produces a two-dimensional laminar boundary layer across a

Fire Suppression Efficiency Screening Using a Counterflow Cylindrical Burner

March 15, 1999
Author(s)
Jiann C. Yang, Michelle K. Donnelly, N C. Prive, William L. Grosshandler
The design and validation of a counterflow cylindrical burner for fire suppression efficiency screening are described. The stability limits of the burner were mapped using various fuel (propane) and oxidizer (air) flows. The stability enveloped compared

The critical evaluation of a comprehensive mass spectral library

March 15, 1999
Author(s)
C L. Clifton, S G. Lias, Anzor I. Mikaia, Stephen Stein, Dmitrii Tchekhovskoi, O D. Sparkman, Vladimir G. Zaikin, Damo Zhu
A description of methods used to build a high quality, comprehensive reference library of EI mass spectra is presented

Measurements of Particle Formation in Flames Inhibited by Iron Pentacarbonyl

March 14, 1999
Author(s)
M D. Rumminger, Gregory T. Linteris
Certain metallic compounds have been found to be substantially more effective flame inhibitors than halogen-containing compounds. In particular, iron pentacarbonyl (Fe(CO)5) was found to be one of the strongest inhibitors--up to two orders of magnitude

A Virtual Assembly Design Environment

March 13, 1999
Author(s)
Sankar Jayaram, Yong Wang, Uma Jayaram, Kevin W. Lyons, Peter F. Hart
The Virtual Assembly Design Environment (VADE) is a Virtual Reality (VR) based engineering application which allows engineers to evaluate, analyze, and plan the assembly of mechanical systems. This system focuses on utilizing an immersive virtual

Local Environments of Three Forms of Ba 2 Ycu 3 O 6+x

March 12, 1999
Author(s)
Winnie K. Wong-Ng, M Melamud, Lawrence H. Bennett
The Wigner-Seitz local atomic cell construction procedure, provides a topological means for comparing series of related structures in terms of the number and type of nearest neighbors. We used this construction to further our understanding of the chemical

Managing Data-Types: The CORBA Approach and AutoMap/AutoLink, an MPI Solution

March 12, 1999
Author(s)
Martial Michel, A A. Schaff, J E. Devaney
There are many ways to create a distributed system, such as with Parallel Virtual Machine (PVM), PARMACS, p4, Message Passing Interface (MPI) and the Common Object Request Broker Architecture (CORBA).This article concentrates on MPI, CORBA, and the

Enhancements to Data Encryption and Digital Signature Federal Standards

March 4, 1999
Author(s)
Elizabeth B. Lennon
This ITL Bulletin, February 1999, summarizes proposed changes to two Federal Information Processing Standards (FIPS): FIPS 46-2, Data Encryption Standard, and FIPS 186, Digital Signature Standard. It outlines the proposed enhancements to the two standards

Performance of Electrically Addressed Spatial Light Modulators

March 3, 1999
Author(s)
Patrick Grother, M L. Hsieh, Craig I. Watson
We address two important performance limitations of commonly available spatial light modulations. First we present a method for the determination of modulation transfer function and amplitude modulation from CCD captures of imaged gratings. Second, we

A Fiber Optic Sensor for Composite Cure Monitoring

March 1, 1999
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. Van Zanten, Joy Dunkers, C G. Zimba, C A. James, S K. Pollack, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The fiber/resin interface is critical to the final mechanical properties of a composite part. The extent f cure and cross-link density affect the resin structure in this interfacial region. In addition, the type of coupling agent coating the fiber, the

A Phase-Field Model of Solidification With Convection

March 1, 1999
Author(s)
D M. Anderson, Geoffrey B. McFadden, A A. Wheeler
We develop a phase-field model for the solidification of a pure material that includes convection in the liquid phase. The model permits the interface to have an anisotropic surface energy, and allows a quasi-incompressible thermodynamic description in

A Well Collimated Quasi-Continuous Atom Laser

March 1, 1999
Author(s)
Edward W. Hagley, Lu Deng, M M. Kozuma, J Wen, Kristian Helmerson, S L. Rolston, William D. Phillips
We demonstrate extraction of sodium atoms from a trapped Bose-Einstein condensate (BEC) using a coherent stimulated Raman process. Optical Raman pulses drive transitions between trapped and untrapped magnetic sublevels so as to give the output coupled BEC

A Wide Bandwidth Printed Wiring Board Transmission Line Probe

March 1, 1999
Author(s)
Nicholas Paulter, Jon R. Pratt
An inexpensive, wide bandwidth, high cycle 50 ω probe is described for making electrical contact to printed wiring board planar transmission lines. The electrical transfer function of the probe and its contact repeatability are presented.

Analytic Solution for a Non-Axisymmetric Isothermal Dendrite

March 1, 1999
Author(s)
Geoffrey B. McFadden, Sam R. Coriell, R F. Sekerka
The Ivantsov solution for an isothermal paraboloidal dendrite growing into a pure, undercooled melt provides a relation between the bulk undercooling and a dimensionless product, the Peclet number, of the growth velocity and tip radius of the dendrite
Displaying 50201 - 50225 of 73697
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