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Programming Robots with Associative Memories

Description: Today, there are several drawbacks that impede the necessary and much needed use of robot learning techniques in real applications. First, the time needed to achieve the synthesis of any behavior is prohibitive. Second, the robot behavior during the learning phase is � by definition � bad, it may even be dangerous. Third, except within the lazy learning approach, a new behavior implies a new learning phase. We propose in this paper to use self-organizing maps to encode the non explicit model of… more
Date: July 10, 1999
Creator: Touzet, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam Profile Measurement at 30 GeV Using Optical Transition Radiation

Description: We present results of measurements of spot size and angular divergence of a 30 GeV electron beam through use of optical transition radiation (OTR). The OTR near field pattern and far field distribution are measured as a function of beam spot size and divergence at wavelengths of 441, 532, and 800 nm, for both the single and double foil configurations. Electron beam spot sizes of 50 {micro}m rms have been resolved, demonstrating the utility of OTR for measurement of small beam spot sizes of high… more
Date: July 10, 1999
Creator: Whittum, David H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DeepNet: An Ultrafast Neural Learning Code for Seismic Imaging

Description: A feed-forward multilayer neural net is trained to learn the correspondence between seismic data and well logs. The introduction of a virtual input layer, connected to the nominal input layer through a special nonlinear transfer function, enables ultrafast (single iteration), near-optimal training of the net using numerical algebraic techniques. A unique computer code, named DeepNet, has been developed, that has achieved, in actual field demonstrations, results unattainable to date with industr… more
Date: July 10, 1999
Creator: Barhen, J.; Protopopescu, V. & Reister, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Neural Network method for Inverse Modeling of Material Deformation

Description: A method is described for inverse modeling of material deformation in applications of importance to the sheet metal forming industry. The method was developed in order to assess the feasibility of utilizing empirical data in the early stages of the design process as an alternative to conventional prototyping methods. Because properly prepared and employed artificial neural networks (ANN) were known to be capable of codifying and generalizing large bodies of empirical data, they were the natural… more
Date: July 10, 1999
Creator: Allen, J.D., Jr.; Ivezic, N.D. & Zacharia, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Materials Compatibility and Migration in Polymer Systems

Description: This is the final report of a one-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The purpose of this project to study the effects of materials migration by direct measurement of the diffusion and convective migration processes in complex polymeric materials and to develop appropriate predictive models. The use of isotopically tagged probe molecules to measure in-situ the diffusion of water in estane was demonstrated. A special env… more
Date: July 10, 1999
Creator: Maggiore, C.J. & Valone, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Methane Conversion to Fuels and Chemicals: Opportunities and Approaches

Description: This is the final report of a one-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). Methane, the primary component of natural gas, has reserves that are on the order of those of petroleum. Processes that utilize these vast supplies of methane will need to be developed to replace dwindling supplies of petroleum in the future. Processes utilizing natural gas promise to be more environmentally friendly, as natural gas as a feedstock is … more
Date: July 10, 1999
Creator: Paffett, M. T. & Zerkle, D. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Diamond and Diamond-Like Materials as Hydrogen Isotope Barriers

Description: This is the final report of a two-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The purpose of this project was to develop diamond and diamond-like thin-films as hydrogen isotope permeation barriers. Hydrogen embrittlement limits the life of boost systems which otherwise might be increased to 25 years with a successful non-reactive barrier. Applications in tritium processing such as bottle filling processes, tritium recovery processe… more
Date: July 10, 1999
Creator: Foreman, L. R.; Barbero, R. S.; Carroll, D. W.; Archuleta, T.; Baker, J.; Devlin, D. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Neural Network-Based Resistance Spot Welding Control and Quality Prediction

Description: This paper describes the development and evaluation of neural network-based systems for industrial resistance spot welding process control and weld quality assessment. The developed systems utilize recurrent neural networks for process control and both recurrent networks and static networks for quality prediction. The first section describes a system capable of both welding process control and real-time weld quality assessment, The second describes the development and evaluation of a static neu… more
Date: July 10, 1999
Creator: Allen, J.D., Jr.; Ivezic, N.D. & Zacharia, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Magnetic Properties of Dy in Pb

Description: Superconductivity can be induced at high temperatures in Pb{sub 2}Sr{sub 2}RCu{sub 3}O{sub 8} (R - rare earth) by partially doping Ca{sup 2+} for R{sup 3+}. In order to understand the interplay between magnetism and superconductivity, the magnetic properties of the parent compounds, Pb{sub 2}Sr{sub 2}RCu{sub 3}O{sub 8}, have been studied. The work presented here includes magnetic susceptibility and specific heat measurements on R=Dy and extends the previous studies on R=Ce, Pr, Tb, Ho and Er. S… more
Date: July 10, 1999
Creator: Skanthakumar, S.; Soderholm, L. & Movshovich, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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