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Displaying 2276 - 2300 of 3910

The Existence of Precursor Soot in the Exhaust of Inverse Diffusion Flames

October 1, 2002
Author(s)
L G. Blevins, Robert A. Fletcher, Bruce A. Benner Jr, Eric B. Steel, George W. Mulholland
Knowledge of the chemical and physical structure of precursor soot is useful in the development of soot particle inception models. This paper examines the hypothesis that soot exiting an inverse flame is similar in chemical and morphological structure to

Thermal Modeling of Multiple-Line-Heat-Source Guarded Hot Plate Apparatus

October 1, 2002
Author(s)
William M. Healy, D R. Flynn
The National Institute of Standards and Technology is building an advanced-design guarded hot plate apparatus of advanced design to provide very accurate thermal transmission properties for specimens of thermal insulation 500 mm in diameter, with

Viscoelastic Characterization of Sealant Materials

September 18, 2002
Author(s)
Donald L. Hunston, Christopher C. White
Polymeric sealants are an important example of a major consumer product where the performance depends critically on rheological properties. The work here developed a testing and modeling procedure to characterize the basic mechanical properties of sealant

Baseline Measures for Improving Housing Durability

September 1, 2002
Author(s)
Robert E. Chapman, C A. Izzo
The Partnership for Advancing Technology in Housing (PATH), a program of the U.S. Department of Housing and Urban Development, is a public/private partnership in which leaders of the home building, product manufacturing, insurance and financial industries

Calibration Experiments of a Laser Scanner

September 1, 2002
Author(s)
Geraldine S. Cheok, Stefan D. Leigh, Andrew L. Rukhin
The potential applications of laser scanners or LADARs (Laser Detection and Ranging) are numerous, and they cross several sectors of the industry construction, large-scale manufacturing, remote sensing, national defense. A LADAR is an instrument which can

Development of a Robotic Structural Steel Placement System

September 1, 2002
Author(s)
Alan M. Lytle, Kamel S. Saidi, William C. Stone
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

Economic Approaches to Homeland Security for Constructed Facilities

September 1, 2002
Author(s)
Harold E. Marshall
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

Enclosure Effects on Flame Spread Over Solid Fuels in Microgravity

September 1, 2002
Author(s)
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

Experiences with Point Cloud Registration

September 1, 2002
Author(s)
Christoph J. Witzgall, Geraldine Cheok
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

Mobile 3D Visualization for Construction

September 1, 2002
Author(s)
Robert R. Lipman
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

Optical Reflectance of Metallic Coatings: Effect of Aluminum Flake Orientation

September 1, 2002
Author(s)
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

Prediction of Cement Physical Properties by Virtual Testing

September 1, 2002
Author(s)
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

Prototype Implementation of an Automated Structural Steel Tracking System

September 1, 2002
Author(s)
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

Report of the NIST Workshop on Automated Steel Construction

September 1, 2002
Author(s)
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

Thermal and Flammability Properties of Polypropylene-Carbon Nanotube Composites

September 1, 2002
Author(s)
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

Towards the Ultimate Construction Site Sensor

September 1, 2002
Author(s)
William C. Stone, Maris Juberts
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
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