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Displaying 41126 - 41150 of 74404

Assessing A Loaded Reverberation Chamber: Calculating Threshold Metrics

August 18, 2003
Author(s)
Christopher L. Holloway, David A. Hill, John M. Ladbury, Todd M. Lammers
In this paper we present an expression for two threshold metrics of a loaded reverberation chamber. One metric is based on the chamber quality factor (Q) and the other is based on a useable volume of a loaded reverberation chamber. These metrics are

Evolution of a Performance Metric for Urban Search and Rescue Robots (2003)

August 18, 2003
Author(s)
Adam S. Jacoff, Brian Weiss, Elena R. Messina
This paper discusses the advancement and proliferation of the Reference Test Arenas for Urban Search and Rescue Robots as representative search and rescue environments, which allow objective performance evaluation of mobile robot capabilities. These arenas

NOT (Faster Implementation ==> Better Algorithm), A Case Study

August 18, 2003
Author(s)
Stephen B. Balakirsky, Thomas R. Kramer
Given two algorithms that perform the same task, one may ask which is better. One simple answer is that the algorithm that delivers the ?best? answer is the better algorithm. But what if both algorithms deliver results of similar quality? In this case, a

Quantifying Uncertainty Towards Information-Centric Unmanned Navigation

August 18, 2003
Author(s)
Rajmohan (. Madhavan, Elena R. Messina
Highly imperfect, inconsistent information and incomplete a priori knowledge introduce uncertainty in sensor-centric unmanned navigation systems. Understanding and quantifying uncertainty yields a measure of useful information that plays a critical role in

Total Radiated Power Limits for Emission Measurements in a Reverberation Chamber

August 18, 2003
Author(s)
Christopher L. Holloway, Perry F. Wilson, Galen H. Koepke, Marco Candidi
In this paper we present a total radiated power limit for emission measurements in reverberation chambers. This total radiation power limit is intended to be equivalent to the FCC maximum E-field limit for emission testing over a ground plane.

Toward a Generic Model for Autonomy Levels for Unmanned Systems (ALFUS)

August 18, 2003
Author(s)
Hui-Min Huang, Elena R. Messina, James S. Albus
Unmanned systems (UMSs) have been deployed to military and civilian operations. UMSs vary widely in their capabilities andcivilian operations. UMSs vary widely in their capabilities and purposes. It would be beneficial to have a set of widely recognized

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

Operating Margin Measurements for an AC Josephson Voltage Standard

August 17, 2003
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
For a number of years, NIST has been developing a Josephson arbitrary waveform synthesizer as an ac Josephson Voltage Standard (ACJVS). The effort has primarily focused on increasing the output voltage to practical levels. Recent advances in circuit design

An Approach to Predicting the Location of Moving Objects During On-Road Navigation

August 15, 2003
Author(s)
Craig I. Schlenoff, Rajmohan Madhavan, Stephen B. Balakirsky
For an autonomous vehicle to navigate in real-time within a dynamic environment, it must be able to respond to moving objects. In particular, it must be able to predict, with appropriate levels of confidence, where those objects are expected to be at times

Optical Manipulation of Atoms at the Nanoscale

August 11, 2003
Author(s)
William D. Phillips
These notes are to provide an outline of a lecture presented at the Enrico Fermi Summer School at Nanoscale Science, held in Varenna in July 2000. They are not intended as a complete account of that lecture, but as an indication of the topics covered and a

Erratum: Modeling Detector Response for Neutron Depth Profiling

August 10, 2003
Author(s)
Kevin Coakley, R. G. Downing, George P. Lamaze, H C. Hofsass, C Ronning, J Biegel
In a previous paper, we analyzed the Neutron Depth Profiling energy spectrum collected from a diamond-like carbon (DLC) sample doped with boron. Based on a numerical model for the Detector Response Function (DRF), we estimated a theoretical boron profile

Comparison of Macro-Tip/Tilt & Meso-Scale Position Beam-Steering Transducers for Free-Space Optical Communications Using a Quadrant Photodiode Sensor

August 6, 2003
Author(s)
Jason J. Gorman, Nicholas Dagalakis, K B. Fielhauer, B G. Boone, J R. Bruzzi, Jeffery Kluga
The National Aeronautics and Space Administration (NASA) plans to develop optical communication terminals for future spacecraft, especially in support of high data rate science missions and manned exploration of Mars. Future, very long-range missions, such
Displaying 41126 - 41150 of 74404
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