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High-precision reflectometry of multilayer coatings for extreme ultraviolet lithography

Description: Synchrotron-based reflectometry is an important technique for the precise determination of optical properties of reflective multilayer coatings for Extreme Ultraviolet Lithography (EUVL). Multilayer coatings enable normal incidence reflectances of more than 65% in the wavelength range between 11 and 15 nm. In order to achieve high resolution and throughput of EUVL systems, stringent requirements not only apply to their mechanical and optical layout, but also apply to the optical properties of t… more
Date: December 29, 1999
Creator: Wedowski, M; Underwood, J H; Gullikson, E M; Bajt, S; Folta, J A; Kearney, P A et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Precision Magnetic Elements for the SNS Storage Ring.

Description: Magnetic elements for an accumulator storage ring for a 1 GeV Spallation Neutron Source (SNS) have been under design. The accumulation of very high intensity protons in a storage ring requires beam optical elements of very high purity to minimize higher order resonances in the presence of space charge. The parameters of the elements required by the accumulator lattice design have been reported. The dipoles have a 17cm gap and are 124cm long. The quadrupoles have a physical length to aperture di… more
Date: March 29, 1999
Creator: Danby, G.; Jackson, J. & Spataro, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ARAC Modeling of the Algeciras, Spain Steel Mill CS-137 Release

Description: On 12 June 1998, the Atmospheric Release Advisory Capability (ARAC) learned from news reports about the accidental release of cesium-137 from a steel mill near Algeciras, Spain. We used the U.S. Navy Operational Global Atmospheric Prediction System (NOGAPS) gridded data for meteorological input into our diagnostic models. To better resolve near-release location and coastal meteorological conditions, we blended four days of WMO surface and upper air observations with the gridded data. Our calcul… more
Date: May 1, 1999
Creator: Vogt, P J; Pobanz, B M; Aluzzi, F J; Baskett, R L & Sullivan, T J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Database for Reviewing and Selecting Radioactive Waste Treatment Technologies and Vendors

Description: Several attempts have been made in past years to collate and present waste management technologies and solutions to waste generators. These efforts have been manifested as reports, buyers’ guides, and databases. While this information is helpful at the time it is assembled, their principal weakness is maintaining the timeliness and accuracy of the information over time. In many cases, updates have to be published or developed as soon as the product is disseminated. The recently developed Nation… more
Date: July 1, 1999
Creator: Schwinkendorf, William Erich & Marushia, Patrick Charles
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ventilation Systems Operating Experience Review for Fusion Applications

Description: This report is a collection and review of system operation and failure experiences for air ventilation systems in nuclear facilities. These experiences are applicable for magnetic and inertial fusion facilities since air ventilation systems are support systems that can be considered generic to nuclear facilities. The report contains descriptions of ventilation system components, operating experiences with these systems, component failure rates, and component repair times. Since ventilation syst… more
Date: December 1, 1999
Creator: Cadwallader, Lee Charles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Decision Support System for Optimum Use of Fertilizers

Description: The Decision Support System for Agriculture (DSS4Ag) is an expert system being developed by the Site-Specific Technologies for Agriculture (SST4Ag) precision farming research project at the INEEL. DSS4Ag uses state-of-the-art artificial intelligence and computer science technologies to make spatially variable, site-specific, economically optimum decisions on fertilizer use. The DSS4Ag has an open architecture that allows for external input and addition of new requirements and integrates its res… more
Date: July 1, 1999
Creator: Hoskinson, Reed Louis; Hess, John Richard & Fink, Raymond Keith
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Temporal Changes in the Spatial Variability of Soil Nutrients

Description: This paper reports the temporal changes in the spatial variability of soil nutrient concentrations across a field during the growing season, over a four-year period. This study is part of the Site-Specific Technologies for Agriculture (SST4Ag) precision farming research project at the INEEL. Uniform fertilization did not produce a uniform increase in fertility. During the growing season, several of the nutrients and micronutrients showed increases in concentration although no additional fertili… more
Date: July 1, 1999
Creator: Hoskinson, Reed Louis; Hess, John Richard & Alessi, Randolph Samuel
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mobile Robotic Teams Applied to Precision Agriculture

Description: The Idaho National Engineering and Environmental Laboratory (INEEL) and Utah State University’s Center for Self-Organizing and Intelligent Systems (CSOIS) have developed a team of autonomous robotic vehicles applicable to precision agriculture. A unique technique has been developed to plan, coordinate, and optimize missions in large structured environments for these autonomous vehicles in realtime. Two generic tasks are supported: 1) Driving to a precise location, and 2) Sweeping an area while … more
Date: April 1, 1999
Creator: Anderson, Matthew Oley; Kinoshita, Robert Arthur; Mckay, Mark D; Willis, Walter David; Gunderson, R.W. & Flann, N.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geometric Correction System Capabilities, Processing, and Application

Description: The U.S. Department of Energy's Remote Sensing Laboratory developed the geometric correction system (GCS) as a state-of-the-art solution for removing distortions from multispectral line scanner data caused by aircraft motion. The system operates on Daedalus AADS-1268 scanner data acquired from fixed-wing and helicopter platforms. The aircraft attitude, altitude, acceleration, and location are recorded and applied to the data, thereby determining the location of the earth with respect to a given… more
Date: June 30, 1999
Creator: Brewster, S. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Current status of the recirculator project at LLNL

Description: The Heavy Ion Fusion Group at Lawrence Livermore National Laboratory has for several years been developing the world's first circular ion induction accelerator designed to transport space charge dominated beams. Currently, the machine extends to 90 degrees, or 10 half-lattice periods (HLP) with induction cores for acceleration placed on every other HLP. Full current transport with acceptable emittance growth without acceleration has been achieved. Recently, a time stability measurement revealed… more
Date: March 23, 1999
Creator: Ahle, L; Autrey, D; Barnard, J; Craig, G; Debeling, A; Eylon, S et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of an In-Situ Microsensor for the Measurements of Chromium and Uranium in Groundwater at DOE Sites

Description: The goal of this program is to develop, optimize and deploy a silicon-based micromachined stripping analyzer for field monitoring trace levels of chromium and uranium. Such system will integrate the sample-handling steps and necessary chemical reactions (using a flow-injection operation) with the actual adsorptive stripping measurement on a small planar chip. Besides the drastic reduction in the size of the analytical system, such miniaturization should lead to increased speed, minimal reagent … more
Date: June 1, 1999
Creator: Wang, Joseph; Liu, Chung-Chiun & Olsen, Khris B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Three-Dimensional Position-Sensitive Geranium Detectors

Description: A critical component of the DOE decontamination and decommissioning effort is the characterization of radioactively contaminated equipment and structures. Gamma-ray spectroscopy and imaging with germanium (Ge) based detectors are powerful techniques that allow for the quick and accurate in-situ identification, spatial mapping, and quantification of radioactive contaminants. However, the image resolution obtained with a Ge detector can be limited by the accuracy to which the gamma-ray interactio… more
Date: June 1, 1999
Creator: Amman,Mark & Luke, Paul N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Estimating the Maximum Splat Diameter of a Solidifying Droplet

Description: We present a simple analytical model for the estimation of the maximum splat diameter of an impacting droplet on a subcooled target. This work is an extension of the isothermal model of Pasandideh-Fard et al. (1996). The model uses an energy conservation argument, applied between the initial and final drop configurations, to approximately capture the dynamics of spreading. The effects of viscous dissipation, surface tension, and contact angle are taken into account. Tests against limited experi… more
Date: March 31, 1999
Creator: Hadjiconstantinou, N.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Toward more precise beam position measurements

Description: For the past year or so we have been examining the properties and limitations of the beam bugs in use in the ETA program at LLNL with a view toward improving the accuracy of beam position and current measurements. When considering measurements of beam position, it is very important to distinguish between relative and absolute position measurements. A relative position measurement determines only the amplitude and direction of the motion of the beam within the transport tube. If one knew where t… more
Date: May 12, 1999
Creator: Clark, J C; Fessenden, T J & Holmes, C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A B-Spline-Based Colocation Method to Approximate the Solutions to the Equations of Fluid Dynamics

Description: The potential of a B-spline collocation method for numerically solving the equations of fluid dynamics is discussed. It is known that B-splines can resolve complex curves with drastically fewer data than can their standard shape function counterparts. This feature promises to allow much faster numerical simulations of fluid flow than standard finite volume/finite element methods without sacrificing accuracy. An example channel flow problem is solved using the method.
Date: July 1, 1999
Creator: Landon, M. D. & Johnson, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High Accuracy, High Energy He-Erd Analysis of H,C, and T

Description: A new analysis technique using high-energy helium ions for the simultaneous elastic recoil detection of all three hydrogen isotopes in metal hydride systems extending to depths of several {micro}m's is presented. Analysis shows that it is possible to separate each hydrogen isotope in a heavy matrix such as erbium to depths of 5 {micro}m using incident 11.48MeV {sup 4}He{sup 2} ions with a detection system composed of a range foil and {Delta}E-E telescope detector. Newly measured cross sections … more
Date: July 22, 1999
Creator: Browning, James F.; Langley, Robert A.; Doyle, Barney L.; Banks, James C. & Wampler, William R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluating Short-Term Climate Variability in the Late Holocene of the Northern Great Plains

Description: This literature study investigated methods and areas to deduce climate change and climate patterns, looking for short-term cycle phenomena and the means to interpret them. Many groups are actively engaged in intensive climate-related research. Ongoing research might be (overly) simplified into three categories: (1) historic data on weather that can be used for trend analysis and modeling; (2) detailed geological, biological (subfossil), and analytical (geochemical, radiocarbon, etc.) studies co… more
Date: September 1, 1999
Creator: Hartman, Joseph H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Covariance approximation for fast and accurate computation of channelized Hotelling observer statistics

Description: We describe a method for computing linear observer statistics for maximum a posteriori (MAP) reconstructions of PET images. The method is based on a theoretical approximation for the mean and covariance of MAP reconstructions. In particular, we derive here a closed form for the channelized Hotelling observer (CHO) statistic applied to 2D MAP images. We show reasonably good correspondence between these theoretical results and Monte Carlo studies. The accuracy and low computational cost of the ap… more
Date: October 1, 1999
Creator: Bonetto, Paola; Qi, Jinyi & Leahy, Richard M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improved Analytical Characterization of Solid Wastes-Forms by Fundamental Development of Laser Ablation Technology

Description: Laser ablation (LA) with inductively coupled plasma mass spectrometry (ICP-MS) has been demonstrated as a viable technology for sample characterization within the EM complex. Laser ablation systems have been set up at the Hanford Site, Savannah River Plant, the Pu immobilization program (MD), Los Alamos, and at numerous other DOE facilities. Advancement of this technology is warranted to guarantee accuracy of analysis for the diversity of complex EM samples. This EMSP research endeavors to unde… more
Date: June 1, 1999
Creator: Russo, Richard E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Principles and techniques for designing precision machines

Description: This thesis is written to advance the reader's knowledge of precision-engineering principles and their application to designing machines that achieve both sufficient precision and minimum cost. It provides the concepts and tools necessary for the engineer to create new precision machine designs. Four case studies demonstrate the principles and showcase approaches and solutions to specific problems that generally have wider applications. These come from projects at the Lawrence Livermore Nationa… more
Date: February 1, 1999
Creator: Hale, L C
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Inter-Laboratory Uranium Double-Spike Experiment

Description: In environmental samples, the major analytical limitation on the use of uranium {sup 238}U/{sup 235}U determinations as an indicator of uranium enrichment is mass dependent bias occurring during the measurement. The double-spike technique can be used to correct the data for this effect. The purpose of this experiment was to evaluate the variation of mass bias among several laboratories and to determine the extent to which the double-spike could be used to reduce analytical uncertainty. Four lab… more
Date: November 11, 1999
Creator: Russ, G. P
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Parametric Grid Information in the DOE Knowledge Base: Data Preparation, Storage and Access.

Description: The parametric grid capability of the Knowledge Base provides an efficient, robust way to store and access interpolatable information which is needed to monitor the Comprehensive Nuclear Test Ban Treaty. To meet both the accuracy and performance requirements of operational monitoring systems, we use a new approach which combines the error estimation of kriging with the speed and robustness of Natural Neighbor Interpolation (NNI). The method involves three basic steps: data preparation (DP), dat… more
Date: October 1, 1999
Creator: Hipp, J. R.; Young, C. J.; Moore, S. G.; Shepherd, E. R.; Schultz, C. A. & Myers, S. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Prognostic Prediction of Tracer Dispersion for the Diablo Canyon Experiments on August 31, September 2, and September 4, 1986

Description: COAMPS/LODI simulations of the tracer experiments at Diablo Canyon on August 31, September 2, and September 4, 1986 had mixed results. Simulated tracer concentrations on August 31 differed significantly from the measured concentrations. The model transported SF{sub 6} too far south and did not predict transport of SF{sub 6} north along highway 101 or into See Canyon. Early in the day the model rapidly transported SF{sub 6} away from the release point while observations suggested the tracer stay… more
Date: November 29, 1999
Creator: Molenkamp, C.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Projective Method for Generic Sensor Fusion Problem

Description: In a multiple sensor system, each sensor produces an output which is related to the desired feature according to a certain probability distribution. We propose a fuser that combines the sensor outputs to more accurately predict the desired feature. The fuser utilizes the lower envelope of regression curves of sensors to project the sensor with the least error at each point of the feature space. This fuser is optimal among all projective fusers and also satisfies the isolation property that ensu… more
Date: August 15, 1999
Creator: Rao, N. S. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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