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Displaying 34526 - 34550 of 74175

Time Signal Stations

July 1, 2006
Author(s)
Michael A. Lombardi
A review article that looks at the history of time signal stations, beginning with the first radio experiments in the 1890's and continuing to the present day. It discusses both shortwave time signal stations, best known for their voice announcements of

Transition From Direct Tunneling to Field Emission in Metal-Molecule-Metal Junctions

July 1, 2006
Author(s)
J M. Beebe, BongSoo Kim, John William Gadzuk, C D. Frisbie, James G. Kushmerick
Current-voltage measurements of metal-molecule-metal tunnel junctions formed from p-conjugated thiols exhibit an inflection point on a plot of ln(I/V2) against 1/V, consistent with a transition in tunneling barrier shape from trapezoidal to triangular. The

A Microfabricated Surface-Electrode Ion Trap for Scalable Quantum Information Processing

June 30, 2006
Author(s)
Signe Seidelin, J Chiaverini, Rainer Reichle, John J. Bollinger, Dietrich G. Leibfried, Joseph W. Britton, Janus Wesenberg, Brad R. Blakestad, John D. Jost, David Hume, C. Langer, R Ozeri, Nobuyasu Shiga, David J. Wineland
We demonstrate confinement of individual atomic ions in an RF Paul trap with novel geometry where the electrodes are located in a single plane and the ions confined above this plane. This device is realized with a simple fabrication procedure and has

A Microfabricated Surface-Electrode Ion Trap for Scalable Quantum Information Processing

June 30, 2006
Author(s)
Signe Seidelin, J Chiaverini, Rainer Reichle, John J. Bollinger, Dietrich G. Leibfried, Joseph W. Britton, Janus Wesenberg, Brad R. Blakestad, John D. Jost, David Hume, C. Langer, R Ozeri, Nobuyasu Shiga, David J. Wineland
We demonstrate confinement of individual atomic ions in an RF Paul trap with novel geometry where the electrodes are located in a single plane and the ions confined above this plane. This device is realized with a simple fabrication procedure and has

Reducing the linewidth of fiber-laser frequency combs

June 30, 2006
Author(s)
Nathan R. Newbury, John J. McFerran, William C. Swann
Fiber laser-based frequency combs typically exhibit broad optical linewidths, particularly in the wings. These broadened linewidths originate from white amplitude noise on the pump laser, which can be eliminated to achieve sub-Hz offset frequency

Autonomy Levels for Unmanned Systems (ALFUS) Framework: An Update

June 28, 2006
Author(s)
Hui-Min Huang, K Pavek, James S. Albus, Elena R. Messina
The initial construct of the framework for the Autonomy Levels of Unmanned Systems (ALFUS) was presented in the 2004 SPIE3 Defense and Security Symposium. This paper describes the continuing development effort and further accomplishments made by the Ad Hoc

Collaborative Tactical Behaviors for Autonomous Ground and Air Vehicles

June 28, 2006
Author(s)
James S. Albus, Anthony J. Barbera, Harry A. Scott, Stephen B. Balakirsky
Tactical behaviors for autonomous ground and air vehicles are an area of high interest to the Army. They are critical for the inclusion of robots in the Future Combat System (FCS). Tactical behaviors can be defined at multiple levels: at the Company

Detection Of Ketenimine (CH 2 CNH) in SGRB2(N) Hot Cores

June 28, 2006
Author(s)
Francis J. Lovas, J M. Hollis, A Remijan, P R. Jewell
Ketenimine (CH2CNH) has been detected in absorption toward the star-forming region Sagittarius B2(N) with the 100-m Green Bank Telescope (GBT) by means of three rotational transitions: 716-808 at 41.5 GHz, 819-909, at 23.2 GHz, and 918-100,10 at 4.9 GHz

Experiments toward Non-contact Safety Standards for Automated Industrial Vehicles

June 28, 2006
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Rajmohan Madhavan
The performance evaluation of an obstacle detection and segmentation algorithm is explained upon comparing a new range camera to ground truth. Automated Guided Vehicles (AGVs) in factory-like environments may one day utilize this algorithm for advanced

A Standard Intelligent System Ontology

June 27, 2006
Author(s)
Craig I. Schlenoff, R Washington, Anthony J. Barbera, C Manteuffel
The level of automation in combat vehicles being developed for the Army?s objective force is greatly increased over the Army?s legacy force. This automation is taking many forms in emerging vehicles; varying from operator decision aides to fully autonomous

An Intelligent Ground Vehicle Ontology for Multi-Agent System Integration

June 27, 2006
Author(s)
Craig I. Schlenoff, R Washington, Anthony J. Barbera
The level of automation in ground combat vehicles being developed for the Army?s objective force is greatly increased over the Army?s legacy force. The development of these intelligent ground vehicles (IGV) requires a thorough understanding of all of the

Performance Analysis of Unmanned Vehicle Positioning and Obstacle Mapping

June 27, 2006
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Rajmohan Madhavan, Tommy Chang, Harry A. Scott
As unmanned ground vehicles take on more and more intelligent tasks, determination of potential obstacles and accurate estimation of their position become critical for successful navigation and path planning. The performance analysis of obstacle mapping

THE LAGR PROJECT - Integrating learning into the 4D/RCS Control Hierarchy

June 27, 2006
Author(s)
James S. Albus, Roger V. Bostelman, Tsai H. Hong, William P. Shackleford, Michael O. Shneier
The National Institute of Standards and Technology's (NIST) Intelligent Systems Division (ISD) has been a part of the Defense Advanced Research Project Agency (DARPA) LAGR (Learning Applied to Ground Robots) Project. The NIST team's objective for the LAGR

3D Range Imaging for Urban Search and Rescue Robotics Research

June 26, 2006
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Rajmohan Madhavan, Brian A. Weiss
Urban search and rescue (US&R) operations can be extremely dangerous for human rescuers during disaster response. Human task forces carrying necessary tools and equipment and having the required skills and techniques, are deployed for the rescue of victims

A Robot Ontology for Urban Search and Rescue

June 26, 2006
Author(s)
Craig I. Schlenoff, Elena R. Messina
The goal of this Robot Ontology effort is to develop and begin to populate a neutral knowledge representation (the data structures) capturing relevant information about robots and their capabilities to assist in the development, testing, and certification
Displaying 34526 - 34550 of 74175
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