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Degree Discipline
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Year
Month
COMPUTERIZED TOOL FOR PREDICTING NUCLEAR MATERIALS USAGE AND RESOURCE UTILIZATION IN PRODUCTION PROCESSES
None
Date:
October 1, 2000
Creator:
Hench, Karen W.; Owens, Sammi D.; Yarbro, Tresa F. & Wilson, Sandra E.
Object Type:
Article
System:
The UNT Digital Library
Conceptual Assessment Framework for Forested Wetland Restoration: The Pen Branch Experience. Restoration of a Severely Impacted Riparian Wetland System - The Pen Branch Project
Development of an assessment framework and indicators can be used to evaluate effectiveness of wetland restoration. Example of these include index of biotic integrity and the hydrogeomorphic method. Both approaches provide qualitative ranks. We propose a new method based on the EPA wetland research program. Similar to other methods, indexes are compared to reference communities; however, the comparisons are quantitative. In this paper we discuss the results of our framework using the Pen Branch riparian wetland system as an example.
Date:
October 1, 2000
Creator:
Kolka, R.; Nelson, E. A. & Trettin, C. C.
Object Type:
Article
System:
The UNT Digital Library
Conceptual design assessment for the co-firing of bio-refinery supplied lignin project. Quarterly report, July 1--September 30, 2000
The initial design criteria of the MSW to ethanol facility have been completed along with preliminary site identification and layouts for the processing facility. These items are the first step in evaluating the feasibility of this co-located facility. Pilot facility design and modification are underway for the production and dewatering of the lignin fuel. Major process equipment identification has been completed and several key unit operations will be accomplished on rental equipment. Equipment not available for rental or at TVA has been ordered and facility modification and shakedown will begin in October. The study of the interface and resulting impacts on the TVA Colbert facility are underway. The TVA Colbert fossil plant is fully capable of providing a reliable steam supply for the proposed Masada waste processing facility. The preferred supply location in the Colbert steam cycle has been identified as have possible steam pipeline routes to the Colbert boundary. Additional analysis is underway to fully predict the impact of the steam supply on Colbert plant performance and to select a final steam pipeline route.
Date:
October 1, 2000
Creator:
Berglund, T.; Ranney, J.T. & Babb, C.L.
Object Type:
Report
System:
The UNT Digital Library
Congressional Record: Proceedings and Debates of the 106th Congress, First Session, Volume 146, Part 16
The Congressional Record contains the records for sessions of the U.S. Congress including summaries of proceedings, letters, and speeches for the Senate and House of Representatives.
Date:
October 2000
Creator:
United States. Congress.
Object Type:
Book
System:
The UNT Digital Library
Construction Overview of Six Landfill Cover Designs
None
Date:
October 1, 2000
Creator:
Dwyer, Stephen F.
Object Type:
Report
System:
The UNT Digital Library
Control System for the LEDA 6.7 MeV Proton Beam Halo Experiment
None
Date:
October 1, 2000
Creator:
Day, L. A.; Pieck, M.; Barr, D.; Kasemir, K. U.; Quintana, B. A.; Salazar, G. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Courthouse Cornerstones, October 2000
Progress report for the Texas Historic Courthouse Preservation Program outlining courthouses of importance and projects that are finished, ongoing, and planned.
Date:
October 2000
Creator:
Texas Historic Courthouse Preservation Program
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Covariance and Bicovariance of the Stochastic Neutron Field
On the basis of the general stochastic neutron field theory developed by Munoz-Cobo et al, results on the covariance and bicovariance of the neutron field have been presented. These two statistical quantities are obtained from the counts observed in detectors operating during a period of time (gate length), {Delta}{sub qc}. A classical example is the so called Feynmann Y-function that is defined as the variance to mean ratio of the neutron field. Upon taking the limit of the covariance and bicovariance function for {Delta}{sub qc} {r_arrow} O , one obtains the two and three detector cross correlation functions respectively. The mathematical structure of the results so obtained have a transparent physical interpretation in terms of the space and delay time overlap between the field-of-view of the detectors. For the first time, an expression has been obtained for the bispectrum function of the stochastic neutron field and for the appropriate weight functions to be used as space-energy-angle correction factors for the one-point kinetics approximation.
Date:
October 1, 2000
Creator:
Perez, R.B.; Mattingly, J.K.; Valentine, T.E. & Mihalczo, J.T.
Object Type:
Report
System:
The UNT Digital Library
Current Los Alamos Sferic Array Studies
An array of fast electric-field-change sensors has been operated in New Mexico, Texas, Florida, and Nebraska during 1998--2000 to improve identification of lightning processes responsible for VHF and optical signals detected by the FORTE satellite. Differential time of arrival methods are used to provide gee-locations of events from multi-station observations. A comparison of two dimensional location from the steric array and the National Lightning Detection Network operated by Global Atmospherics, Inc. is presented. Also, the time differences of multiple paths of the lightning signals to a station due to ionospheric reflection can be used to determine the altitude of a temporally narrow event. We present altitude determination of Compact Intracloud Discharges observed by the steric array and compare with the Kennedy Space Center Lightning Detection and Ranging (LDAR) system in Florida.
Date:
October 1, 2000
Creator:
Heavner, Matthew J.; Smith, David A. & Harlin, Jeremiah
Object Type:
Article
System:
The UNT Digital Library
Daingerfield State Park
Text about Daingerfield State Park in East Texas that was published in the "When..." section of an October 2000 Texas Highways magazine article.
Date:
2000-10~
Creator:
Mallory, Randy
Object Type:
Text
System:
The UNT Digital Library
DAMAGE DETECTION IN BUILDING JOINTS BY STATISTICAL ANALYSIS.
None
Date:
October 1, 2000
Creator:
Farrar, C.R. & Allen, D.W.
Object Type:
Article
System:
The UNT Digital Library
DATA NORMALIZATION ISUE FOR VIBRATION-BASED STRUCTURAL HEALTH MONITORING
None
Date:
October 1, 2000
Creator:
Sohn, H.; Farrar, C. R. & Hunter, N. F.
Object Type:
Article
System:
The UNT Digital Library
DESIGN FOR A ONE-GIGAWATT ANNULAR-BEAM KLYSTRON
None
Date:
October 1, 2000
Creator:
FAZIO, M.; HABIGER, K. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Design Issues for Hardware Implementation of an Algorithm for Segmenting Hyperspectral Imagery
None
Date:
October 1, 2000
Creator:
Theiler, James; Leeser, Miriam; Estlick, Michel & Szymanski, John J.
Object Type:
Article
System:
The UNT Digital Library
Design of Computer Experiments for Improving an Impact Test Simulation
None
Date:
October 1, 2000
Creator:
Hemez, Francois M.; Wilson, Amanda C. & Doebling, Scott W.
Object Type:
Article
System:
The UNT Digital Library
A design patterns analysis of the umbra simulation framework
None
Date:
October 1, 2000
Creator:
Small, Daniel E.; Gottlieb, Eric; Edlund, Kim & Slutter, Cara
Object Type:
Report
System:
The UNT Digital Library
Determination of Reactive Surface Area of Melt Glass
A comprehensive investigation of natural and manmade silicate glasses, and nuclear melt glass was undertaken in order to derive an estimate of glass reactive surface area. Reactive surface area is needed to model release rates of radionuclides from nuclear melt glass in the subsurface. Because of the limited availability of nuclear melt glasses, natural volcanic glass samples were collected which had similar textures and compositions as those of melt glass. A flow-through reactor was used to measure the reactive surface area of the analog glasses in the presence of simplified NTS site ground waters. A measure of the physical surface area of these glasses was obtained using the BET gas-adsorption method. The studies on analog glasses were supplemented by measurement of the surface areas of pieces of actual melt glass using the BET method. The variability of the results reflect the sample preparation and measurement techniques used, as well as textural heterogeneity inherent to these samples. Based on measurements of analog and actual samples, it is recommended that the hydraulic source term calculations employ a range of 0.001 to 0.01 m{sup 2}/g for the reactive surface area of nuclear melt glass.
Date:
October 1, 2000
Creator:
Bourcier,W. L.; Roberts, S.; Smith, D. K.; Hulsey, S.; Newton,L.; Sawvel, A. et al.
Object Type:
Report
System:
The UNT Digital Library
Development of a High Resolution Imaging Spectrometer. Final Technical Report for Period September 4, 1999 - March 4, 2000
None
Date:
October 1, 2000
Creator:
Krieger, A. S. & Parsignault, D. R.
Object Type:
Report
System:
The UNT Digital Library
Development of an In-Situ Microsensor for the Measurements of Chromium and Uranium in Groundwater at DOE Sites - Final Report
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 consumption and disposal, higher sensitivity and improved precision, and would thus revolutionize the way by which toxic metals are being monitored. The new electrochemical devices should have an enormous impact upon pollution control and prevention, as they should lead to a substantially more effective and economic monitoring of priority metal pollutants. The project combined fundamental and practical aspects of electroanalysis and microsystems to meet the monitoring and sensing needs of DOE sites.
Date:
October 1, 2000
Creator:
Wang, J.
Object Type:
Report
System:
The UNT Digital Library
Development of core cladding fabrication techniques for Phase I fission propulsion systems
None
Date:
October 1, 2000
Creator:
Salvail, P.; Reid, R. & Ring, P.
Object Type:
Article
System:
The UNT Digital Library
DEVELOPMENT OF NDA METHODS FOR NEPTUNIUM METAL
Many techniques have been developed and applied in the US and other countries for the control of the special nuclear materials (SNM) plutonium and uranium, but no standard methods exist for the determination of neptunium in bulk containers. Such methods are needed because the U.S. Department of Energy requires all Government-owned {sup 237}Np be treated as if it were SNM and the International Atomic Energy Agency is considering how to monitor this material. We present the results of the measurements of several samples of neptunium metal with a variety of techniques. Analysis of passive gamma-ray spectra uniquely identifies the material, provides isotopic ratios for contaminants, such as {sup 243}Am, and may provide information about the shielding, mass, and time since processing. Active neutron interrogation, using the delayed neutron technique in a package monitor, provides useful data even if the neptunium is shielded. The tomographic gamma scanner yields a map of the distribution of the neptunium and shielding in a container. Active photon interrogation with pulses from a 10-MeV linac produces delayed neutrons between pulses, even when the container is heavily shielded. Data from one or more of these techniques can be used to identify the material and estimate a mass …
Date:
October 1, 2000
Creator:
MOSS, C. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
DEVELOPMENT PROGRAM FOR PU-238 AQUEOUS RECOVERY PROCESS
Aqueous processing is necessary for the removal of impurities from {sup 238}Pu dioxide ({sup 238}PuO{sub 2}) fuel due to unacceptable levels of {sup 234}U and other non-actinide impurities in the scrap fuel. Impurities at levels above General Purpose Heat Source (GPHS) fuel specifications may impair the performance.of the heat sources. Efforts at Los Alamos have focused on developing the bench scale methodology for the aqueous process steps which includes comminution, dissolution, ion exchange, precipitation, and calcination. Recently, work has been performed to qualify the bench scale methodology, to show that the developed process produces pure {sup 238}PuO{sub 2} meeting GPHS fuel specifications. In addition, this work has enabled us to determine how waste volumes may be minimized during full-scale processing. Results of process qualification for the bench scale aqueous recovery operation and waste minimization efforts are presented.
Date:
October 1, 2000
Creator:
PANSOY-HJELVIK, M.; REIMUS, M. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
DGS Newsletter, Volume 24, Number 8, October 2000
Newsletter of the Dallas Genealogical Society discussing membership, Society meetings, genealogical workshops and events, and other news of interest to members.
Date:
October 2000
Creator:
Dallas Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Diesel Emission Control-- Sulfur Effects (DECSE) Program-- Phase II Summary Report: NOx Adsorber Catalysts
The investigations performed in this project demonstrated the ability to develop a NO{sub x} regeneration strategy including both an improved lean/rich modulation cycle and rich engine calibration, which resulted in a high NO{sub x} conversion efficiency over a range of operating temperatures. A high-temperature cycle was developed to desulfurize the NO{sub x} absorber catalyst. The effectiveness of the desulfurization process was demonstrated on catalysts aged using two different sulfur level fuels. The major findings of this project are as follows: (1) The improved lean/rich engine calibration achieved as a part of this test project resulted in NO{sub x} conversion efficiencies exceeding 90% over a catalyst inlet operating temperature window of 300 C-450 C. This performance level was achieved while staying within the 4% fuel economy penalty target defined for the regeneration calibration. (2) The desulfurization procedure developed showed that six catalysts, which had been exposed to fuel sulfur levels of 3-, 16-, and 30-ppm for as long as 250 hours, could be recovered to greater than 85% NO{sub x} conversion efficiency over a catalyst inlet operating temperature window of 300 C-450 C, after a single desulfurization event. This performance level was achieved while staying within the 4% fuel economy penalty …
Date:
October 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library