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Displaying 2076 - 2100 of 3908

Some Issues Relating to Performance Evaluation of LADARs

September 16, 2003
Author(s)
Geraldine S. Cheok, William C. Stone, Christoph J. Witzgall
The use and scope of LADAR applications continues to expand as the technology matures. This growth is reflected in NIST's experience with research into the applications of LADARs for construction, manufacturing, and autonomous vehicle navigation. However

Terrain Characterization from Ground-Based LADAR

September 16, 2003
Author(s)
Christoph J. Witzgall, Geraldine Cheok, David E. Gilsinn
Test runs of Army Research Laboratory s (ARL) autonomous vehicle (Experimental Unmanned Vehicle, XUV) were followed by the acquisition of high resolution scans of selected regions of the test course. These scans were used to i) determine terrain features

Large-Scale Modeling of Fire Suppression with Water Sprays

September 2, 2003
Author(s)
Kevin B. McGrattan
The mechanisms underlying fire suppression by water can bedivided into gas and solid phase phenomena. Numerical models ofthese phenomena are dependent on the level of detail given to thecombustion and the fuel pyrolysis processes.Presently, models of gas

Unwanted Accelerated Burning After Suppressant Delivery

September 2, 2003
Author(s)
Anthony P. Hamins, Kevin B. McGrattan, Glenn P. Forney
In a number of real-scale fire tests, accelerated or enhanced unwanted burning has been observed immediately following the delivery of a fire suppressant. The conditions under which this phenomena occurs, its potential for harm, and its effect on the

Immersive Virtual Reality for Steel Structures

September 1, 2003
Author(s)
Robert R. Lipman
This paper describes an immersive virtual reality system for steel structures. The system integrates standard models and formats for representing structural steel and three-dimensional graphic objects with a framework for device independent virtual

Papers from 1991-2003 Halon Options Technical Working Conferences (HOTWC)

September 1, 2003
Author(s)
Richard G. Gann, Star R. Burgess, Paul A. Reneke
As a result of the 1987 Montreal Protocol on Substances that Deplete the Ozone Layer and the 1990 U.S. Clean Air Act, there began a movement toward phaseout of the use of the halon fire suppressants. The HOTWC was initiated as a forum for such contributory

Reciprocity Law Experiments in Polymeric Photodegradation: A Critical Review

September 1, 2003
Author(s)
Jonathan W. Martin, Joannie W. Chin, Tinh Nguyen
celerating the photodegradation of polymeric materials is of great interest in weathering research. One way of achieving acceleration is by exposing polymeric materials to a high radiant flux, but questions have arisen as to whether high radiant flux

A Study of In-Tube Evaporation Heat Transfer of Carbon Dioxide

August 17, 2003
Author(s)
N N. Sawant, M Kim, William V. Payne, Piotr A. Domanski, Y W. Hwang
The evaporative heat transfer characteristics of carbon dioxide (CO 2) were measured in a fluid-heated, 8.0 mm ID smooth stainless steel tube. The test apparatus was a concentric tube heat exchanger heated by water in the annulus with CO 2 in the central

Effects of Non-Uniform Air Flow on Finned-Tube Evaporator Performance

August 1, 2003
Author(s)
John Choi, William V. Payne, Piotr A. Domanski
An experimental investigation was implemented to determine the capacity degradation due to non-uniform refrigerant and air flow distributions, and to assess the potential to recover the lost capacity via controlling refrigerant distribution between

Flexural Strengthening of Masonry Walls with External Composite Bars

August 1, 2003
Author(s)
K K. Bajpai, Dat Duthinh
The strengthening of epoxy with milled glass fibers allows full strength development of #2 glass FRP bars in 200 mm or half a concrete masonry unit length. This fiber-reinforced epoxy should be effective for other types of bars as well.With full anchorage

Fundamental Aspects of the Application of Carbon Dioxide in Comfort Cooling

August 1, 2003
Author(s)
J S. Brown, Piotr A. Domanski
This paper presents entropy generation analyses for the evaporator, compressor, gas cooler, expansion device and liquid-line suction-line heat exchanger for a transcritical carbon dioxide cycle for automotive and residential air-conditioning systems, and

LoopDA -- A Natural Ventilation System Design and Analysis Tool

August 1, 2003
Author(s)
William S. Dols, Steven J. Emmerich
The Loop Equation Design Method has been proposed for sizing ventilation airflow components of natural and hybrid ventilation systems. While the loop design method has been demonstrated on a limited basis, the method has been automated in order to better

Measured Impact of a Rooftop Photovoltaic System

August 1, 2003
Author(s)
Arthur H. Fanney, E R. Weise, K R. Henderson
A 35-kilowatt roof top photovoltaic system has been installed at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland. The system, located on a the roof that connects NIST s Administration Building to its adjoining conference

Particle Size Measurements for Spheres With Diameters of 50 nm to 400 nm

August 1, 2003
Author(s)
Michelle K. Donnelly, George W. Mulholland
This paper describes a calibration service NIST is offering that measures the effective diameter of particles suspended in liquids using electrical differential mobility analysis. Measurements are for particles with diameters in the range of 50 nm to 400

Review of Instrumented Indentation

August 1, 2003
Author(s)
Mark R. VanLandingham
Instrumented indentation, also known as depth-sensing indentation or nanoindentation, is increasingly being used to probe the mechanical response of materials from metals and ceramics to polymeric and biological meaterials. The additional levels of control

Understanding Fire and Smoke Flow Through Modeling and Visualization

August 1, 2003
Author(s)
Glenn P. Forney, Daniel M. Madrzykowski, Kevin B. McGrattan, L M. Sheppard
Structural fires cost the American economy more than $100 billion annually in property damage, maintaining fire departments and insurance. A price cannot be put on the human toll: on average each year, 4,000 civilians die and 23,000 are injured in fires

Validation of CONTAMW Predictions for Tracer Gas in a Townhouse

August 1, 2003
Author(s)
Steven J. Emmerich, Steven J. Nabinger, A Gupte, Cynthia H. Reed
To provide additional validation data for the multizone airflow and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF 6), was manually injected within one room of
Displaying 2076 - 2100 of 3908
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