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.
The classical Melnikov method provides information on the behavior of deterministic planar systems that may exhibit transitions, i.e. escapes from and captures into preferred regions of phase space. This paper describes and illustrates a unified treatment
The NIST Construction and Automation Group (CMAG), in cooperation with the NIST Intelligent Systems Division (ISD), is researching robotic structural steel placement as part of a project to develop an Automated Steel Construction Testbed (ASCT). The ASCT
The 11 September 2001 terrorist attack on the New York World Trade Center (WTC) Complex and the Pentagon changed dramatically the way buildings, industrial facilities, and infrastructure will be designed, sited, and managed in the United States. The
Y N. Nakamura, Takashi Kashiwagi, Kevin B. McGrattan
Enclosure effects on the transition from localized ignition to subsequent flame spread over a thermally-thin solid fuel in microgravity are investigated numerically solving the low Mach number time-dependent Navier-Stokes equations. The numerical model
The development of LADAR (laser distance and ranging) technology to acquire 3D spatial data made it possible to create 3D models of complex objects. Because an unobstructed line-of-sight is required to capture a point on an object, an individual LADAR scan
The Building and Fire Research Laboratory initiated a program prior to the events of September 11, 2001, to put structural fire protection on a stronger scientific footing. The catastrophic collapses of the World Trade Center underscored the need to
G Papadopoulos, Rodney A. Bryant, William M. Pitts
Phase-resolved measurements of the velocity field in acoustically forced, flickering laminar co-flowing methane/air diffusion flames have been made. Identical flames have been studied extensively in the past in order to characterize the effects of the
Until recently, visualization of 3D models required computational resources available only on desktop computers in office environments. With the advance of technology, it is now possible to visualize substantial 3D models on mobile handheld computers in
Li Piin Sung, Maria E. Nadal, M E. McKnight, Egon Marx, B Laurenti
The orientation of platelet-like pigments in coatings is affected by the processing conditions resulting in appearance variations of the final product. A set of aluminum-flake pigmented coatings having different flake orientations was pre-pared using
Dale P. Bentz, C Haecker, X Feng, Paul E. Stutzman
Assuring the quality of the massive quantities of cement produced worldwide each year is a daunting task. Currently, the cement industry performs extensive physical testing to assess the quality of their product, resulting in large costs for both materials
This publication is the Proceedings of the 19th International Symposium on Automation and Robotics in Construction (ISARC). The symposium was held at the National Institute of Standards and Technology, Gaithersburg, Maryland during 23-25 September 2002
Performance of R22 and R410A split air conditioners was evaluated experimentally at the ambient temperature range from 82 F to 135 F. Capacity and EER decreased as the outdoor temperature increased. The capacity of the R410A system relative to the capacity
The U.S. Department of Energy's (DOE) procedure for testing the Annual Fuel Utilization Efficiency (AFUE) of residential central furnaces and boilers references ASHRAE Standard 103-1993. The standard has been used by the furnace/boiler industry to obtain
K M. Furlani, D T. Latimer, David E. Gilsinn, Alan M. Lytle
This paper discusses the prototype implementation of a system developed by researchers at the National Institute of Standards and Technology (NIST) for the transfer of real-time on-site metrology and metrology-based data for tracking steel frame
Alan M. Lytle, Kamel S. Saidi, William C. Stone, John L. Gross
The Building and Fire Research Laboratory of the National Institute of Standards and Technology, in cooperation with the American Institute of Steel Construction, sponsored a workshop on automated steel construction. The purpose of the workshop was to
Takashi Kashiwagi, E A. Grulke, J N. Hilding, Richard H. Harris Jr., W H. Awad, Jack F. Douglas
Nanocomposites based on polypropylene and carbon nanotubes (up to 2 vol.-%) were melt blended, yielding good dispersion of the nanotubes without using any organic treatment or additional additives. Carbon nanotubes enhance the thermal stability of
The NIST Construction Metrology and Automation Group (CMAG), in cooperation with the NIST Intelligent Systems Division (ISD), is developing performance metrics and researching issues related to the design and development of a Next Generation LADAR sensor
This publication is the proceedings of the 34th Joint Meeting of the US-Japan Panel on Wind and Seismic Effects. The meeting was held at the National Institute of Standards and Technology, Gaithersburg, Maryland, during 13-15 May 2002. The proceedings
J Marchand, E Samson, Kenneth A. Snyder, J J. Beaudoin
The transport of ions in colloids, granular and consolidated porous media is important to a wide variety of environmental and engineering problems. Typical examples are the transport of contaminants in marine sediments, the containment of hazardous waste
This document describes the goals, objectives, and guiding principles for the NIST-led investigation of the WTC disaster. The NIST investigation plan includes eight projects that provide the focus for the technical work. Project 1 is an analysis of
For entombment to be a viable option for the decommissioning of nuclear structures, the effectiveness of available engineered barriers must be assured. Barrier performance must be estimated with the aid of computer models that can accurately predict the
An experimental study is presented for water droplet impingement containing an additive upon a heated stainless steel surface. A solution of 30 % (mass fraction) sodium acetate trihydrate, CH 3COONa 3H 2O was used for the experiments. The impaction process
On 3 May 1999, a major storm passed through the mid-west, spawning at least 76 tornadoes, and killing more than 50 people. The Oklahoma City, Oklahoma metropolitan area was the hardest hit, with 43 fatalities, and 10,000 homes destroyed or severely damaged
This study is the first in a series of reports on understanding the performance of fire fighter clothing, in protecting skin from thermal injury resulting from exposure to high intensity thermal radiation. A detailed mathematical model is constructed to