An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
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
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
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
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
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
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
William M. Pitts, E Braun, Richard D. Peacock, Henri E. Mitler, Erik L. Johnsson, Paul A. Reneke, L G. Blevins
Gas-phase temperature is the most ubiquitous measurement recorded in fire environments and plays a central role in understanding of fire behavior. Generally, either bare-bead or sheathed thermcouples are employed. While it is recognized that such
This report describes the latest information, technology, and research on the curing of high-performance concrete (HPC). The scope of the report is expanded somewhat to examine the current body of knowledge on the effects of various curing conditions on
Predicting the liquefaction resistance of soil is an important step in the engineering design of new and the retrofit of existing structures in earthquake-prone regions. The procedure currently used in the U.S. and throughout much of the world to predict
This report presents the results of Cone Calorimeter testing of selected materials from current passenger train systems. The test data from this test method were compared to FRA guideline test results. The Cone Calorimeter data was also tabulated to
Recently the authors introduced a length scale which effectively collapsed the near field centerline development of velocity and mass fraction for variable density axisymmetric jets whose initial conditions correspond to those of fully developed turbulent
It is often assumed that commercial and institutional buildings are fairly airtight and that envelopee air leakage does not have a significant impact on energy consumption and indoor air quality in these buildings. Furthermore, it is assumed that more
This report presents the results of seismic evaluation and cost estimates carried out by the National Institute of Standards and Technology (NIST) for rehabilitation of existing buildings owned by the Federal Emergency Management Agency (FEMA). The seismic
This paper examines the effect of the addition of 0.5% mass isopentane to R123 on thevapor-space condensation heat transfer of R123.In a previous study, the pool boiling performance of R123 was improved by adding 0.5% mass isopentane. Consequently, the
The selection a working fluid as a refrigerant for the vapor compression cycle is discussed. For thermodynamic performance to be optimized particular attention must be paid to the fluid's critical point and molar heat capacity. To achieve a reasonable
A velocity Verlet algorithm for velocity dependent forces is described for modeling a suspension of rigid body inclusions. The rigid body motion is determined from the quaternion-based scheme of Omelyan [Comput. Phys. 12, 97 (1998)]. An iterative method to
Rapidly, changing building designs, uses, materials, contents, fire protection and the general intermix of industrial/commercial and residential occupancies has created a need to understand the potential hazards and losses from fires and performance of
Richard D. Peacock, Richard W. Bukowski, S. H. Markos
Recent advances in fire test methods and hazard analysis techniques make it useful to re-examine passenger train fire safety requirements. The use of test methods based on heat release rate (HRR), incorporated with fire modeling and hazard analysis, could
Richard D. Peacock, Richard W. Bukowski, S. H. Markos
Recent advances in fire test methods and hazard analysis techniques make it useful to re-examine passenger train fire safety requirements. The use of test methods based on heat release rate (HRR), incorporated with fire modeling and hazard analysis, could
Recent advances in Computational Fluid Dynamics (CFD) and in computing technology have simplified user interfaces and reduced the time required to predict the details of contaminant concentrations in enclosures, allowing indoor air quality issues in
Despite years of planning and hundreds of drop-tower tests in preparation, the combustion experiments aboard STS-83 and STS-94 were full of surprises. Fortunately, these surprises were related to physical phenomena rather than the hardware's performance
The Next-Generation Fire Suppression Program (NGP), now in its second year, has as its goal the development by 2004 of alternative firefighting technologies to Halon 1301 that can be economically implemented in aircraft, ships, land combat vehicles, and
The Natioinal Institute of Standards and Technology's Building and Fire Research Laboratory (NIST/BFRL), one of NIST's measurements and standards laboratories, provides the measurement technologies, performance prediction methods, and technical advances
Dale P. Bentz, Edward J. Garboczi, Kenneth A. Snyder
This user's manual provides documentation and computer program listings for the three-dimensional hard core/soft shell microstructure model developed at the National Institute of Standards and Technology. The model has been developed to represent the three