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NIST Authors in Bold

Displaying 2826 - 2850 of 3873

Modelling Service Life and Life-Cycle Cost of Steel-Reinforced Concrete

May 1, 1999
Author(s)
G J. Frohnsdorff
The NIST / ACI / ASTM Workshop on Modelling Service Life and Life-Cycle Cost of Steel-Reinforced Concrete was focused on possibilities for developing and standardizing such models, specifically for concrete exposed to chlorides. The report includes

Relating Thermoplastic Olefin (TPO) Microstructure to Paint Adhesion

May 1, 1999
Author(s)
Mark R. VanLandingham
Advances in the use of the atomic force microscope (AFM) to characterize polymeric materials have recently been made. Phase imaging with the AFM has emerged as a powerful technique, providing contrast enhancement of topographic features and, in some cases

Test Procedure Development for Residential Dishwashers

May 1, 1999
Author(s)
Natascha S. Milesi-Ferretti
It has been recognized that the current Department of Energy (DOE) dishwasher test procedure is inadequate in testing soil sensing dishwashers. As a result, DOE proposed that NIST evaluate the dishwasher test procedure as a part of their Appliance

Issues in Numerical Simulation of Fire Suppression

April 27, 1999
Author(s)
S R. Tieszen, Amelia R. Lopez
This paper outlines general physical and computational issues associated with performing numerical simulation of fire suppression. Fire suppression encompasses a broad range of chemistry and physics over a lxge range of time and length scales. The authors

Recent Results from the Dispersed liquid Agent Fire Suppression Screen

April 27, 1999
Author(s)
Jiann C. Yang, Michelle K. Donnelly, William L. Grosshandler, N C. Prive
Mosl or the current methods for fire suppression efficiency screening (e.2.. cup burners) are designed for evaluating gaseous fire suppression agents. Potential uses of liquid agents as halon replacements have been recently proposed in several applications

Tropodegradable Halocarbons and Main Group Element Compounds

April 21, 1999
Author(s)
J D. Mather, R E. Tapscott
Although it is not certain that a “drop-in” chemical substitute (as opposed to a new technology) for halons that can be used in normally occupied areas will ever be identified. there are two promising paths to such an agent. The first is to target

A Survey of Construction Metrology Options for the AEC Industry

April 1, 1999
Author(s)
C Lindfors, P C. Chang, William C. Stone
Techniques for measuring distances, relative heights, and angles have improved significantly during the last decades. Some of these techniques can be used in the architecture, engineering, and Construction industry to improve the precision of measurements

An Argument for Using Coarse Cements in High-Performance Concretes

April 1, 1999
Author(s)
Dale P. Bentz, C J. Hacker
The NIST cement hydration microstructural model and experimental studies are used to investigate the effects of particle size distribution and water-to-cement ratio on hydration kinetics. Cement hydration is limited by the availability of water at the

Modeling of Bare and Aspirated Thermocouples in Compartment Fires

April 1, 1999
Author(s)
L G. Blevins, William M. Pitts
As part of an effort to characterize the uncertainties associated with temperature measurements in fire environments, models of bare bead single-shielded aspirated, and double-shielded aspirated thermocouples were developed and used to study the effects of

NIST Research Toward Construction Site Integration and Automation

April 1, 1999
Author(s)
William C. Stone, K A. Reed, P Chang, L E. Pfeffer, Adam S. Jacoff
Current uses of computers in construction include design, planning, scheduling, and cost estimating. Much more could be achieved on a fully computer integrated construction site. This paper describes initial work at NIST toward construction site

Specimen Preparation for Scanning Electron Microscopy

April 1, 1999
Author(s)
Paul E. Stutzman, J R. Clifton
Microscopy plays an important role in the examination of cementitious materials. Optical and electron-optical techniques allow examination of microstructural details with sub-micrometer definition. The increased application of scanning electron microscopy

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
Displaying 2826 - 2850 of 3873
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