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Displaying 37976 - 38000 of 74079

Empirical comparison of predictive models for mobile agents

July 23, 2004
Author(s)
A Henniner, Rajmohan (. Madhavan
The need to predict an agent?s intents or future actions has been well documented in multi-agent system?s literature and has been motivated by both systematically practical and psychologically principled concerns. However, little effort has focused on the

Improving CNC Machining Accuracy Through Thermal Model-Based Control

July 21, 2004
Author(s)
John L. Michaloski, Frederick M. Proctor, Johannes A. Soons, R King, W Bakula, H Dominguez, N Frampton
The United States Army has a requirement to machine munitions to strict tolerances so that the munitions will launch properly and the explosives will detonate correctly. High precision parts require machine tools to operate with a high degree of accuracy

Improving CNC Machining Accuracy Through Thermal Model-Based Control

July 21, 2004
Author(s)
John L. Michaloski, Frederick M. Proctor, Johannes A. Soons, R King, W Bakula, H Dominguez, N Frampton
The United States Army has a requirement to machine munitions to strict tolerances so that the munitions will launch properly and the explosives will detonate correctly. High precision parts require machine tools to operate with a high degree of accuracy

Arrays of magnetoresistive sensors for nondestructive testing

July 20, 2004
Author(s)
David P. Pappas, Fabio C. da Silva, Alexy V. Nazarov
Magnetic field distributions were measured for test stripline structures with anisotropic magnetoresistive (AMR), thin film Permalloy sensors. Linear arrays of eight barber-pole-type AMR sensors were used to increase the speed of the imaging and stability

Knowledge representation and planning for on-road driving

July 16, 2004
Author(s)
Stephen B. Balakirsky, Christopher J. Scrapper Jr
This paper presents a cost-based adaptive planning agent and knowledge layers that is operating at one level of a deliberative hierarchical planning system for autonomous road driving. At this level, the planning agent is responsible for developing

Analysis and Design of Parallel Mechanisms with Flexure Joints

July 15, 2004
Author(s)
Byoung H. Kang, J Wen, Nicholas Dagalakis, Jason J. Gorman
Flexure joints are frequently used in precision motion stages and micro-robotic mechanisms due lo their monolithic construction. The joint compliance, howeyer, can affect the static and dynamic performance of the overall mechanism. In this paper, we

Program: 2004 Boulder Laboratories Postdoctoral Poster Symposium

July 15, 2004
Author(s)
Joe W. Magee
In honor of both the Boulder Labs 50 Year Anniversary and 50 years of the NIST/National Research Council Postdoctoral Associateship Program, we will hold the First Boulder Labs Postdoctoral Poster Symposium on Thursday, June 24, 2004, from 2 to 4 p.m. in

Proton NMR Determination of Miscibility in a Bulk Model Photoresist System Poly (4-Hydroxystyene) and the Photoacid Generator, Di(t-butylphenyl) Iodonium Perfluorooctane Sulfonate

July 13, 2004
Author(s)
David L. VanderHart, Vivek M. Prabhu, Eric K. Lin
The intimacy of component mixing in 2 blends of poly(4-hydroxystyrene) (PHS) and a photoacid generator (PAG), di(t-butylphenyl) iodonium perfluorooctane sulfonate (PFOS) were studied by solid state proton NMR. Mass ratios were 91/9 and 85/15 PHS/PFOS

Finite coplanar waveguide width effects in pulsed inductive microwave magnetometry

July 12, 2004
Author(s)
Michael Schneider, Anthony B. Kos, Thomas J. Silva
The effect of finite coplanar waveguide (CPW) width on the measurement of the resonance frequency in thin ferromagnetic films has been characterized for pulsed inductive microwave magnetometry. A shift in resonant frequency is a linear function of the

Round Robin for Standardization of MEMS Length and Strain Measurements

July 12, 2004
Author(s)
Janet M. Cassard, Erik M. Secula, J Huang
A microelectromechanical systems (MEMS) Length and Strain Round Robin is underway to compare results of in-plane length measurements, residual strain measurements, and strain gradient measurements at a number of laboratories. The goal of this round robin

Current-driven switching in a single exchange-biased ferromagnetic layer

July 9, 2004
Author(s)
Tingyong Chen, Yi Ji, C Chien, Mark D. Stiles
We demonstrate spin-transfer torque effects in a single exchange-biased ferromagnetic layer. A current through a point contact to the exchange-biased Co layer reverses the magnetization of a nanodomain in the layer hysteretically for low applied magnetic

Fire Performance of Partition Assemblies

July 7, 2004
Author(s)
Samuel L. Manzello, Richard G. Gann, S R. Kukuck, Kuldeep R. Prasad, Walter W. Jones
For nearly a century, the cornerstone of fire safety in buildings has been the ability to confine a fire for a time sufficient for people to reach safety and for successful fire suppression activity. To effect this, the partitions in a building (walls

Micropatterning Neuronal Cells on Polyelectrolyte Multilayers

July 7, 2004
Author(s)
Darwin Reyes-Hernandez, Elizabeth M. Perruccio, Patricia Becerra, Laurie E. Locascio, Michael Gaitan
This paper describes an approach to adhere retinal cells on micropatterned polyelectrolyte multilayer (PEM) lines adsorbed on polydimethylsiloxane (PDMS) surfaces, using microfluidic networks. PEMs were patterned on flat oxidized PDMS surfaces by

Physics-Based Modeling of Community Fires

July 7, 2004
Author(s)
D D. Evans, Ronald G. Rehm, Elisa S. Baker, E G. McPherson, Jeffrey B. Wallace
Physics-based modeling of fires in the wildland urban interface (WUI) is used to develop practical tools for fire hazard evaluation of landscaped properties. The approach differs from that used for wildland-fire operation models in that individual fuel

RCS: A Cognitive Architecture for Intelligent Multi-Agent Systems

July 7, 2004
Author(s)
James S. Albus, Tony Barbera
RCS (Real-time Control System) is a cognitive architecture designed to enable any level of intelligent behavior, up to and including human levels of performance. RCS was inspired 30 years ago by a theoretical model of the cerebellum, the portion of the

Simulating the Fires in the World Trade Center

July 7, 2004
Author(s)
Kevin B. McGrattan, C P. Bouldin
The National Institute of Standards and Technology (NIST) is conducting a two year investigation of the World Trade Center disaster. Among numerous tasks, computer simulations of the fires are being conducted to provide structural engineers with a detailed

The Basis for Egress Provisions in U.S. Building Codes

July 7, 2004
Author(s)
Richard W. Bukowski, Erica D. Kuligowski
Some of the earliest public safety-from-fire regulations in the US are requirements for egress stairs adopted by New York City in 1860 . One of the first model regulations promulgated by the National Fire Protection Association (NFPA) was the 1927 Building

Urban/Widlland Fires: Ignition by Embers

July 7, 2004
Author(s)
Samuel L. Manzello, Thomas G. Cleary, Jiann C. Yang
Urban-wildland fires have plagued the United States for centuries. Embers are produced as trees and other objects burn in urban-wildland fires. These embers are entrained in the atmosphere and may be carried by winds over long distances. Hot embers

Superconducting transition edge sensor using dilute AlMn alloys

July 6, 2004
Author(s)
Steven Deiker, William B. Doriese, Gene C. Hilton, Kent D. Irwin, William H. Rippard, Joel N. Ullom, Leila R. Vale, Steve T. Ruggiero, Anthony Williams, B. Young
We have fabricated a bolometer using a transition-edge sensor (TES) made of Al doped with Mn to suppress the superconducting critical temperature !Tc" of Al from #1 K to #100 mK. The resulting detector exhibits low-frequency noise consistent with theory
Displaying 37976 - 38000 of 74079