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In-Situ Measurements of Low Enrichment Uranium Holdup Process Gas Piping at K-25 - Paper for Waste Management Symposia 2010 East Tennessee Technology Park Oak Ridge, Tennessee

In-Situ Measurements of Low Enrichment Uranium Holdup Process Gas Piping at K-25 - Paper for Waste Management Symposia 2010 East Tennessee Technology Park Oak Ridge, Tennessee

Date: January 1, 2010
Creator: B., Rasmussen
Description: This document is the final version of a paper submitted to the Waste Management Symposia, Phoenix, 2010, abstract BJC/OR-3280. The primary document from which this paper was condensed is In-Situ Measurement of Low Enrichment Uranium Holdup in Process Gas Piping at K-25 Using NaI/HMS4 Gamma Detection Systems, BJC/OR-3355. This work explores the sufficiency and limitations of the Holdup Measurement System 4 (HJVIS4) software algorithms applied to measurements of low enriched uranium holdup in gaseous diffusion process gas piping. HMS4 has been used extensively during the decommissioning and demolition project of the K-25 building for U-235 holdup quantification. The HMS4 software is an integral part of one of the primary nondestructive assay (NDA) systems which was successfully tested and qualified for holdup deposit quantification in the process gas piping of the K-25 building. The initial qualification focused on the measurement of highly enriched UO{sub 2}F{sub 2} deposits. The purpose of this work was to determine if that qualification could be extended to include the quantification of holdup in UO{sub 2}F{sub 2} deposits of lower enrichment. Sample field data are presented to provide evidence in support of the theoretical foundation. The HMS4 algorithms were investigated in detail and found to sufficiently compensate ...
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Comparison of RF BPM Receivers for NSLS-II Project

Comparison of RF BPM Receivers for NSLS-II Project

Date: May 4, 2009
Creator: Pinayev,I. & Singh, O.
Description: The NSLS-II Light Source being built at Brookhaven National Laboratory requires submicron stability of the electron orbit in the storage ring in order to utilize fully very small emittances and electron beam sizes. This sets high stability requirements for beam position monitors and a program has been initiated for the purpose of characterizing RF beam position monitor (BPM) receivers in use at other light sources. Present state-of-the-art performance will be contrasted with more recently available technologies.
Contributing Partner: UNT Libraries Government Documents Department
Matrix solution of coupling impedance in multi-layer circular cyclindrical structures

Matrix solution of coupling impedance in multi-layer circular cyclindrical structures

Date: May 4, 2009
Creator: Hahn,H. & Choi, E.
Description: Continuing interest in computing the coupling impedance of cylindrical multi-layer beam tubes led to several recent publications. A novel matrix method is here presented in which radial wave propagation is treated in analogy to longitudinal transmission lines. Starting from the Maxwell equations the solutions for monopole electromagnetic fields are in each layer described by a 2 x 2 matrix. Assuming isotropic material properties within one layer, the radially transverse field components at the inner boundary of a layer are uniquely determined by matrix transfer of the field components at its outer boundary. By imposing power flow constraints on the matrix, field matching between layers is enforced and replaced by matrix multiplication. The coupling impedance of a stainless steel beam tube defined by a matrix is given as a representative demonstration.
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Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
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Steel-SiC Metal Matrix Composite Development

Steel-SiC Metal Matrix Composite Development

Date: July 17, 2005
Creator: Smith, Don D.
Description: The goal of this project is to develop a method for fabricating SiC-reinforced high-strength steel. We are developing a metal-matrix composite (MMC) in which SiC fibers are be embedded within a metal matrix of steel, with adequate interfacial bonding to deliver the full benefit of the tensile strength of the SiC fibers in the composite.
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Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
Next Generation Bipolar Plates for Automotive PEM Fuel Cells

Next Generation Bipolar Plates for Automotive PEM Fuel Cells

Date: April 15, 2010
Creator: Adrianowycz, Orest; Norley, Julian; Stuart, David J.; Flaherty, David; Wayne, Ryan; Williams, Warren et al.
Description: The results of a successful U.S. Department of Energy (DoE) funded two-year $2.9 MM program lead by GrafTech International Inc. (GrafTech) are reported and summarized. The program goal was to develop the next generation of high temperature proton exchange membrane (PEM) fuel cell bipolar plates for use in transportation fuel cell applications operating at temperatures up to 120 °C. The bipolar plate composite developed during the program is based on GrafTech’s GRAFCELL resin impregnated flexible graphite technology and makes use of a high temperature Huntsman Advanced Materials resin system which extends the upper use temperature of the composite to the DoE target. High temperature performance of the new composite is achieved with the added benefit of improvements in strength, modulus, and dimensional stability over the incumbent resin systems. Other physical properties, including thermal and electrical conductivity of the new composite are identical to or not adversely affected by the new resin system. Using the new bipolar plate composite system, machined plates were fabricated and tested in high temperature single-cell fuel cells operating at 120 °C for over 1100 hours by Case Western Reserve University. Final verification of performance was done on embossed full-size plates which were fabricated and glued into ...
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WASTE CRATE ASSAY SYSTEM (WCAS) : ASSAY SOLUTIONS FOR VERY LARGE REMOTE HANDLED CRATES

WASTE CRATE ASSAY SYSTEM (WCAS) : ASSAY SOLUTIONS FOR VERY LARGE REMOTE HANDLED CRATES

Date: January 1, 2001
Creator: Menlove, Howard O.; Rinard, Phillip M.; Li, T. K. (Tien K.); Romero, M.; Hiruta, K. & Nasuno, S.
Description: An advanced passive neutron counter has been designed and fabricated to measure the plutonium content in large remote handled (RH) waste crates. The waste crate assay system (WCAS) was developed under an agreement between Los Alamos National Laboratory, Japan Nuclear Fuel Limited (JNFL), and BNFL Instruments Inc. (BII) to measure the plutonium content in the waste generated in the Rokkasho reprocessing facility. The primary goal of the design was to produce an assay system for large waste containers. The system also includes 200-L drum pallet assay capability. The measurements are based on neutron-time correlation counting of the passive neutron emissions from the 240Pu, and the plutonium isotopic ratios are used to calculate the total plutonium. The system is designed for both RH waste and low-activity plutonium waste. The system permits the measurement of the singles, doubles, and triples rates and the multiplicity mode analysis is used together with the 'add-a-source' method to correct for the matrix materials in the crates. In the multiplicity analysis, the efficiency for counting the neutrons emitted from the crate is directly calculated from the three measured rates. For improved detectability limits, advanced methods have been incorporated in the WCAS-A to reduce the cosmic-ray neutron backgrounds. ...
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The LANSCE RICE control system upgrade.

The LANSCE RICE control system upgrade.

Date: January 1, 2003
Creator: Oothoudt, Michael; Schaller, S. (Stuart); Bjorklund, E. A. (Eric A.); Burns, M. J. (Mary J.); Carr, G. (Gary); Carr, G. (Gary) et al.
Description: The LANSCE (Los Alamos Neutron Science Center) control system upgrade program continues with the impending replacement of the RICE (Remote Instrumentation and Control Equipment) subsystem. The RICE subsystem upgrade is a challenge because of its technology (late 1960s), number of channels (&gt;10,000), and unique characteristics (all-modules data takes, timed/flavored data takes). The plan is to replace at least the non-timed data and the command portions of the subsystem with Programmable Logic Controllers (PLCs). We discuss motivations, technological challenges, proof-of-principle, and planning. The boundary condition, as usual, is that we must implement these major changes on a running accelerator.
Contributing Partner: UNT Libraries Government Documents Department
Fort Yukon, Chalkyitsik, & Venetie Biomass Boiler Feasibility Study

Fort Yukon, Chalkyitsik, & Venetie Biomass Boiler Feasibility Study

Date: March 31, 2009
Creator: Greg Koontz, ME William A. Wall, PhD
Description: The Council of Athabascan Tribal Governments (CATG) is a consortium of ten Gwich'in and Koyukon Athabascan tribes settled in 10 remote villages and are linked by the Yukon River System. The CATG mission is to maintain the Yukon Flats region as Indian Country by asserting traditional rights and taking responsibility for developing tribal technical capacity to manage the land and resources. It is the intent of CATG to explore and develop all opportunities for a renewable and self-sufficient energy program for each of the villages. CATG envisions utilization of forest resources both for construction and energy as one of the best long-term strategies for integrating the economic goals for the region as well as supporting the cultural and social issues. The intent for this feasibility project is to focus specifically on biomass utilization for heat, first, and for future electrical generation within the region, second. An initial determination has already been made regarding the importance of wood energy as a primary source of renewable energy to displace diesel fuel in the Yukon Flats region. A desktop study of other potential renewable resources was conducted in 2006.
Contributing Partner: UNT Libraries Government Documents Department
Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
ACRF Instrumentation Status and Information - June 2009

ACRF Instrumentation Status and Information - June 2009

Date: June 1, 2009
Creator: Voyles, JW
Description: The purpose of this report is to provide a concise but comprehensive overview of Atmospheric Radiation Measurement Climate Research Facility instrumentation status. The report is divided into the following five sections: (1) new instrumentation in the process of being acquired and deployed, (2) field campaigns, (3) existing instrumentation and progress on improvements or upgrades, (4) proposed future instrumentation, and (5) Small Business Innovation Research instrument development.
Contributing Partner: UNT Libraries Government Documents Department
Large area detector based computed tomography system for production nondestructive evaluation.

Large area detector based computed tomography system for production nondestructive evaluation.

Date: January 1, 2001
Creator: Keating, S. C. (Scott C.); Davis, A. A. (Anthony A.) & Claytor, T. N. (Thomas N.)
Description: We present a system for industrial x-ray computed tomography that has been optimized for all phases of nondestructive component inspection. Data acquisition is greatly enhanced by the use of high resolution, large area, flat-panel amorphous-silicon detectors. The detectors have proven, over several years, to be a robust alternative to CCD-optics and image intensifier CT systems. In addition to robustness, these detectors provide the advantage of area detection as compared with the single slice geometry of linear array systems. Parallel processing provides significant speed improvements for data reconstruction, and is implemented for parallel-beam, fan-beam and Feldkamp conebeam reconstruction algorithms. By clustering ten or more equal-speed computers, reconstruction times are reduced by an order of magnitude. We have also developed interactive software for visualization and interrogation of the full three-dimensional dataset. Inspection examples presented in this paper include an electro-mechanical device, nonliving biological specimens and a turbo-machinery component. We also present examples of everyday items for the benefit of the layperson.
Contributing Partner: UNT Libraries Government Documents Department
Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
Radiation Chemistry 2008 Gordon Research Conference - July 6-11, 2008

Radiation Chemistry 2008 Gordon Research Conference - July 6-11, 2008

Date: May 15, 2009
Creator: Bartels, David M.
Description: Radiation Chemistry is chemistry initiated by ionizing radiation: i.e. photons or particles with energy sufficient to create charge pairs and/or free radicals in a medium. The important transients include conduction band electrons and 'holes', excitons, ionic and neutral free radicals, highly excited states, and solvated electrons. Effects of radiation span timescales from the energy deposition in femtoseconds, through geminate recombination in picoseconds and nanoseconds, to fast radical chemistry in microseconds and milliseconds, and ultimately to processes like cancer occurring decades later. The radiation sources used to study these processes likewise run from femtosecond lasers to nanosecond accelerators to years of gamma irradiation. As a result the conference has a strong interdisciplinary flavor ranging from fundamental physics to clinical biology. While the conference focuses on fundamental science, application areas highlighted in the present conference will include nuclear power, polymer processing, and extraterrestrial chemistry.
Contributing Partner: UNT Libraries Government Documents Department
Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
Tall structure lightning induced by sprite-producing discharges.

Tall structure lightning induced by sprite-producing discharges.

Date: January 1, 2003
Creator: Stanley, M. A. (Mark A.) & Heavner, M. J. (Matthew J.)
Description: The large and rapid charge transfer of some +CGs can initiate upward positive leaders from tall structures while simultaneously initiating downward positive streamers below the base of the ionosphere in the form of sprites . Structures with &gt;400 m height have a significantly enhanced probability of launching upward positive leaders, the presence of which is readily detected later if a dart leader propagates down the channel to ground, generating a -CG return stroke. Such tall structures can be repeatedly struck if, as often happens, sprite-producing +CGs repeatedly occur .
Contributing Partner: UNT Libraries Government Documents Department
Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
Hillslope Flow Routing, Contaminant Transport, and Water Uptake in Zero-Order Watersheds Subject to Intensive Forest Plantation Management. Phase 1A: Watershed and Soil Characterization. Phase 1B: Instrumentation of First Hillslope and Trench

Hillslope Flow Routing, Contaminant Transport, and Water Uptake in Zero-Order Watersheds Subject to Intensive Forest Plantation Management. Phase 1A: Watershed and Soil Characterization. Phase 1B: Instrumentation of First Hillslope and Trench

Date: June 21, 2009
Creator: Jackson, Rhett, C.
Description: Abstract – An accomplishment report from a hill slope hydrology study in South Carolina.
Contributing Partner: UNT Libraries Government Documents Department
Use of predictive performance modeling during large-scale system installation

Use of predictive performance modeling during large-scale system installation

Date: January 1, 2002
Creator: Kerbyson, D. J. (Darren J.); Hoisie, A. (Adolfy) & Wasserman, H. J. (Harvey J.)
Description: We concern ourselves in this paper with one important application of predictive performance modeling - to validate the measured performance during system installation. In general, models can provide performance and scalability expectations of a system for a given workload. The application characteristics of the ASCI workload utilized in this paper is SAGE, a multidimensional, 3D, multi-material hydrodynamics code with adaptive mesh refinement. We review the salient features of an analytical model of this code that can be applied to predict its performance on a large class of large-scale parallel systems. We then utilize the model to validate system performance on a Compaq Alpha-server ES45 Supercomputing system being built at Los Alamos, and expected to grow to 30T peak performance in the next few years. We describe the methodology applied during system installation and upgrades to establish a baseline for the achievable 'real' performance of the system. We show that utilization of predictive performance models is also a powerful debugging tool.
Contributing Partner: UNT Libraries Government Documents Department
Synchrotron-based high-pressure research in materials science

Synchrotron-based high-pressure research in materials science

Date: June 1, 2016
Creator: Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi
Description: <title>Abstract</title> <p><fig position='anchor'><graphic href='S088376941600110X_figAb' mime-subtype='jpeg' mimetype='image' position='float' type='simple'/></fig></p>
Contributing Partner: UNT Libraries Government Documents Department
The SNS linac high power RF system design, status, and results

The SNS linac high power RF system design, status, and results

Date: January 1, 2003
Creator: Rees, D. E. (Daniel E.); Bradley, J. T. (Joseph T.), III; Cummings, K. A. (Karen Ann); Hardek, T. W. (Thomas W.); Roybal, W. T. (William T.) & Tallerico, P. J. (Paul J.)
Description: The Spallation Neutron Source being built at the Oak Ridge National Lab in Tennessee requires a 1 GeV proton linac. Los Alamos has responsibility for the RF systems for the entire linac. The linac requires 3 distinct types of RF systems: 2.5-MW peak, 402.5 MHz, RF systems for the RFQ and DTL (7 systems total); 5-MW peak, 805 MHz systems for the CCL and the two energy corrector cavities (6 systems total); and 550-kW peak, 805 MHz systems for the superconducting sections (8 1 systems total). The design of the SNS Linac RF system was presented at the 2001 Particle Accelerator Conference in Chicago. Vendors have been selected for the klystrons (3 different vendors), circulators ( I vendor), transmitter (1 vendor), and high power RF loads (3 different vendors). This paper presents the results and status of vendor procurements, test results of the major components of the Linac RF system and our installation progress.
Contributing Partner: UNT Libraries Government Documents Department