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Displaying 50201 - 50225 of 74165

Mixed Layer Pyrolysis Model for Polypropylene

July 5, 1999
Author(s)
Kathryn M. Butler
A one-dimensional model describing the melting, degradation, and bubbling behavior of polypropylene exposed to a high heat flux is presented. The region of vigorous bubbling observed in experiment is represented as a mixed layer of uniform temperature

Modeling of Sprinkler, Vent and Draft Curtain Interaction

July 5, 1999
Author(s)
Kevin B. McGrattan, Anthony P. Hamins, Glenn P. Forney
The International Fire Sprinkler, Smoke & Heat Vent, Draft Curtain Fire Test Project organized by the National Fire Protection Research Foundation (NFPRF) brought together a group of industrial sponsors to support and plan a series of large scale tests to

Particulate Entry Lag in Spot-Type Smoke Detectors

July 5, 1999
Author(s)
Thomas G. Cleary, Artur A. Chernovsky, William L. Grosshandler, Michael D. Anderson
It is well documented that alarm signals from spot-type smoke detectors (ionization and photoelectric) are delayed when the threshold value has been achieved outside the detector housing as a result of convective transport of smoke through the detector to

Reflectance Standards at Ultraviolet Wavelengths

July 2, 1999
Author(s)
P Y. Barnes, E A. Early, Maria E. Nadal
Polytetrafluoroethylene (PTFE) is widely used in remote sensing applications requiring a diffuse reflectance standard for detector calibration. The bi-directional and directional-hemispherical reflectance properties of both pressed and sintered PTFE were

A Critical Comparison Between Time and Frequency Domain Relaxation Functions

July 1, 1999
Author(s)
Chad R. Snyder, F I. Mopsik
Considerable work has been performed on providing a theoretical basis for the KohlrauschWilliamsWatts (KWW) and HavriliakNegami(HN) relaxation functions. Because of this, several papers have examined the ''interconnection'' of these two functions. In this

Digital Images and Computer Modelling

July 1, 1999
Author(s)
Edward J. Garboczi, Dale P. Bentz, Nicos Martys
This chapter describes how digital images of porous materials can be analyzed to give information about the structure and properties of the material, describes various ways 3-D digital-image-based models can be generated to help understand real materials.

Dispersed Liquid Agent Fire Suppression Screen Apparatus

July 1, 1999
Author(s)
Jiann C. Yang, Michelle K. Donnelly, William L. Grosshandler, N C. Prive
The design, construction, demonstraion and operation of a bench-scale device capable of screening the fire suppression efficiency of liquid agents are described in detail in this report. The apparatus is based on a well-characterized flame, a means to

Dynamic Interrogation of a Basic Cutting Process

July 1, 1999
Author(s)
Matthew A. Davies, Michael Kennedy, Jon R. Pratt, Christopher J. Evans
A dynamic cutting fixture based on the test rig pioneered by Peters et al. has been developed to aid investigations of cutting process dynamics. This active fixture consists of a flexure-based tool holder with a single dominant modal direction, two voice

Effectiveness of AlN Encapsulate in Annealing Ion-Implanted SiC

July 1, 1999
Author(s)
E Handy, M V. Rao, K A. Jones, M A. Derenge, P Chi, R D. Vispute, T Venkatesan, N A. Papanicolaou, J Mittereder
Aluminum nitride (AlN) has been used as an encapsulate for annealing nitrogen (N), arsenic (As), antimony (Sb), aluminum (Al), and boron (B) ion-implanted 6H-SiC. Atomic force microscopy (AFM) has revealed that the AlN encapsulate prevents the formation of

Effects of Defocus and Algorithm on Optical Step Height Calibration

July 1, 1999
Author(s)
Theodore D. Doiron, Theodore V. Vorburger, P Sullivan
Defocus effects on step height measurements by interferometric microscopy are estimated using different algorithms to calculate the step height. The interferometric microscope is a Mirau-type with a 20x objective and a numerical aperture (NA) of 0.4. Even

Effects of Mutations of the Active Site Arginine Residues in-4-Oxalocrotonate Tautomerase on the pK a Values of Active Site Residues and on the pH Dependence of Catalysis

July 1, 1999
Author(s)
R M. Czerwinski, T K. Harris, W H. Johnson, P M. Legler, J T. Stivers, A S. Mildvan, C P. Whitman
The unusually low pK a value of the general base catalyst Pro-1 (pK a = 6.4) in 4-oxalocrotonate tautomerase (4-OT) has been ascribed to both a low dielectric constant at the active site and to the proximity of the cationic residues Arg-11 and Arg-39

Electron Collision Cross Sections Derived from Critically Assessed Data

July 1, 1999
Author(s)
Loucas G. Christophorou, James K. Olthoff
Electron-molecule collisions are among the most fundamental processes in gas discharges. They are also the precursors of the ions and the radicals which drive the etch, cleaning, or deposition processes in plasma reactors. Hence, there is a need for a
Displaying 50201 - 50225 of 74165
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