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Displaying 9451 - 9475 of 9863

The GOES Time Code Service, 1974 - 2004: A Retrospective

February 27, 2005
Author(s)
Michael A. Lombardi, D. W. Hanson
After nearly 30 years of continuous operation, NIST ended its Geostationary Operational Environmental Satellites (GOES) time code service at 0 hours, 0 minutes Coordinated Universal Time (UTC) on January 1, 2005. This event marked the end of an important

Task Analysis of Autonomous On-road Driving

October 28, 2004
Author(s)
Tony Barbera, John A. Horst, Craig I. Schlenoff, David Aha
The Real-time Control System (RCS) Methodology has evolved over a number of years as a technique to capture task knowledge and organize it into a framework conducive to implementation in computer control systems. The fundamental premise of this methodology

Constitutive Models for a Poly(e-caprolactone) Scaffold

October 1, 2004
Author(s)
Timothy P. Quinn, Tammy L. Oreskovic, Christopher N. McCowan, N Washburn
We investigate material models for a porous, polymeric scaffold used for bone. The material was made by co-extruding poly (e-caprolactone) (PCL), a biodegradable polyester, and poly(ethylene oxide)(PEO). The water soluble PEO was removed resulting in a

Task Analysis of Autonomous On-Road Driving

October 1, 2004
Author(s)
Anthony J. Barbera, John A. Horst, Craig I. Schlenoff, David Aha
The Real-time Control System (RCS) Methodology has evolved over a number of years as a technique to capture task knowledge and organize it into a framework conducive to implementation in computer control systems. The fundamental premise of this methodology

High Heat-Flux Sensor Calibration: A Monte Carlo Modeling

July 1, 2004
Author(s)
A V. Murthy, A Prokhorov, D P. DeWitt
Conventional calibration of heat-flux sensors uses high-temperature blackbody radiation, and places the sensors away from the blackbody aperture. This approach limits the achievable calibration heat-flux to about 50 kW/m2. Recent interest in extending the

Deconvolving LADAR Images Of Bar Codes for Construction Site Object Recognition

October 1, 2003
Author(s)
David E. Gilsinn, Geraldine S. Cheok, Dianne M. O'Leary
This report discusses a general approach to reconstructing ground truth intensity images of bar codes that have been distorted by LADAR optics. The first part of this report describes the experimental data collection of several bar code images along with

Suppression of Cup-Burner Flames

September 17, 2003
Author(s)
F Takahashi, Gregory T. Linteris, V Katta
The unsteady suppression process of a laminar methane-air co-flow diffusion flame formed on a cup burner has been studied experimentally and numerically in normal earth gravity. The computation uses a time-dependent direct numerical simulation with

Modified Allard Method for Effective Intensity of Flashing Lights

August 1, 2002
Author(s)
Yoshihiro Ohno, D Couzin
For the measurement of effective intensity of flashing lights, the Blondel-Rey, Blondel-Rev-Douglas, Form Factor, and Allard methods are adopted in various applications. These methods produce significantly different results depending on the pulse waveforms

Elastic Properties of Model Random Three-Dimensional Open-Cell Solids

January 1, 2002
Author(s)
A P. Roberts, Edward Garboczi
Most cellular solids are random materials, while practically all theoretical structure-property relations are for periodic models. To generate theoretical results for random models the finite element method (FEM) was used to study the elastic properties of

Triggered Image Capture for High Speed Display Characterization

January 1, 2002
Author(s)
John W. Roberts
¿¿¿Precision display measurements often involve the integration of light measurements over many frames. Newer display technologies with high speed light modulators such as micromirrors are able to make sophisticated use of temporal modulation. This may

The Application of Optical Coherence Tomography to Problems in Polymer Matrix Composites

January 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., D P. Sanders, M J. Everett, William H. Green, Donald L. Hunston, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites often exhibit superior properties to

Automation Infrastructure System for a Robotic 30-Ton Bridge Crane

April 1, 1998
Author(s)
William C. Stone, L E. Pfeffer
This paper describes the sensing portion of a system used to convert an existing 30-ton high bay bridge crane to computer control for automated placement of construction components. The system is being designed to permit either telepresent or fully

Image Sharpness Measurement in Scanning Electron Microscopy - Part I

January 1, 1998
Author(s)
Michael T. Postek, Andras Vladar
This study introduces the idea of the sharpness concept in relationship to the determination of scanning electron microscope (SEM) perfomance. Scanning electron microscopes are routinely used in many manufacturing environments. Fully automated or

Elastic-Plastic Behavior of Textured Short-Fiber Composites

November 1, 1996
Author(s)
Martin Dunn, H M. Ledbetter
We propose a relatively simple micromechanics model to predict the elastic-plastic response of short-fiber composites with a preferred orientation of the reinforcement, i.e. a texture. Our theoretical efforts are directed toward a composite system with an

Real-Time Iconic Image Processor

March 1, 1985
Author(s)
Ronald Lumia, Michael O. Shneier, Ernest Kent
The Sensory-Interactive Robotics Group at the National Bureau of Standards is producing PIPE, a pipelined image-processing engine, for research in low-level machine vision. PIPE processes sequences of images at field rates through a series of point and

Tailoring Security Controls for Industrial Control Systems

November 16, 2015
Author(s)
Victoria Y. Pillitteri, Larry Feldman, Gregory A. Witte
This bulletin summarizes the information presented in NIST SP 800-82, Rev 2: Guide to Industrial Control Systems (ICS) Security written by Keith Stouffer, Victoria Pillitteri, Suzanne Lightman, Marshall Abrams and Adam Hahn. The publication provides
Displaying 9451 - 9475 of 9863
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