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4,904
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591
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439
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100
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49
D. Jack Davis Art Education Collection
27
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10
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9
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43
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27
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Year 2000 TWRS Maintenance procedure review report
A concern exists that some equipment in use might contain microprocessors that are dependent upon a time date function. The majority of the software programming for microprocessors has only utilized a 2 digit identifier for the year. With the approach of the year 2000, (Y2K), there is concern that the date function will not be correctly recognized and some functions will not operate properly. TWRS maintenance procedures have been reviewed to identify equipment components that may not be Y2K compliant. Engineering judgment was utilized to eliminate procedures and equipment that is obviously not impacted by Y2K.
Date:
February 24, 1999
Creator:
Adams, M. R.
System:
The UNT Digital Library
Studies of Flexible MOX/LEU Fuel Cycles
This project was a collaborative effort involving researchers from Oak Ridge National Laboratory and North Carolina State University as well as Texas A and M University. The background, briefly, is that the US is planning to use some of its excess weapons Plutonium (Pu) to make mixed-oxide (MOX) fuel for existing light-water reactors (LWRs). Considerable effort has already gone into designing fuel assemblies and core loading patterns for the transition from full-uranium cores to partial-MOX and full-MOX cores. However, these designs have assumed that any time a reactor needs MOX assemblies, these assemblies will be supplied. In reality there are many possible scenarios under which this supply could be disrupted. It therefore seems prudent to verify that a reactor-based Pu-disposition program could tolerate such interruptions in an acceptable manner. Such verification was the overall aim of this project. The task assigned to the Texas A and M team was to use the HELIOS code to develop libraries of two-group homogenized cross sections for the various assembly designs that might be used in a Westinghouse Pressurized Water Reactor (PWR) that is burning weapons-grade MOX fuel. The NCSU team used these cross sections to develop optimized loading patterns under several assumed scenarios. …
Date:
March 1, 1999
Creator:
Adams, M.L. & Alonso-Vargas, G.
System:
The UNT Digital Library
Bin Set 1 Calcine Retrieval Feasibility Study
At the Department of Energy's Idaho Nuclear Technology and Engineering Center, as an interim waste management measure, both mixed high-level liquid waste and sodium bearing waste have been solidified by a calculation process and are stored in the Calcine Solids Storage Facilities. This calcined product will eventually be treated to allow final disposal in a national geologic repository. The Calcine Solids Storage Facilities comprise seven ''bit sets.'' Bin Set 1, the first to be constructed, was completed in 1959, and has been in service since 1963. It is the only bin set that does not meet current safe-shutdown earthquake seismic criteria. In addition, it is the only bin set that lacks built-in features to aid in calcine retrieval. One option to alleviate the seismic compliance issue is to transport the calcine from Bin Set 1 to another bin set which has the required capacity and which is seismically qualified. This report studies the feasibility of retrieving the calcine from Bi n Set 1 and transporting it into Bin Set 6 which is located approximately 650 feet away. Because Bin Set 1 was not designed for calcine retrieval, and because of the high radiation levels and potential contamination spread from the …
Date:
October 1, 1999
Creator:
Adams, R. D.; Berry, S. M.; Galloway, K. J.; Langenwalter, T. A.; Lopez, D. A.; Noakes, C. M. et al.
System:
The UNT Digital Library
The ASCI Network for SC '98: Dense Wave Division Multiplexing for Distributed and Distance Computing
This document highlights the DISCOM's Distance computing and communication team activities at the 1998 Supercomputing conference in Orlando, Florida. This conference is sponsored by the IEEE and ACM. Sandia National Laboratories, Lawrence Livermore National Laboratory, and Los Alamos National Laboratory have participated in this conference for ten years. For the last three years, the three laboratories have a joint booth at the conference under the DOE's ASCI, Accelerated Strategic Computing Initiatives. The DISCOM communication team uses the forum to demonstrate and focus communications and networking developments. At SC '98, DISCOM demonstrated the capabilities of Dense Wave Division Multiplexing. We exhibited an OC48 ATM encryptor. We also coordinated the other networking activities within the booth. This paper documents those accomplishments, discusses the details of their implementation, and describes how these demonstrations support overall strategies in ATM networking.
Date:
June 1, 1999
Creator:
Adams, Roger L.; Butman, Wayne; Martinez, Luis G.; Pratt, Thomas J. & Vahle, Michael O.
System:
The UNT Digital Library
Experimental Investigation of In Situ Cleanable HEPA Filters
For the past several years studies have been conducted to investigate the use of innovative, alternative approaches to conventional disposable high efficiency particulate air filters.
Date:
January 7, 1999
Creator:
Adamson, D.J.
System:
The UNT Digital Library
FY'99 final report for the expedited technology demonstration project: demonstration test results for the MSO/off-gas and salt recycle system
Molten Salt Oxidation (MSO) is a promising alternative to incineration for the treatment of a variety of organic wastes. Lawrence Livermore National Laboratory (LLNL) has prepared a facility in which an integrated pilot-scale MSO treatment system is being tested and demonstrated. The system consists of a MSO vessel with a dedicated off-gas treatment system, a salt recycle system, feed preparation equipment, and a ceramic final waste forms immobilization system. This integrated system was designed and engineered based on operational experience with an engineering-scale reactor unit and extensive laboratory development on salt recycle and final forms preparation. The MSO/off-gas system has been operational since December 1997. The salt recycle system and the ceramic final forms immobilization became operational in May 1998. In FY98, we have tested the MSO facility with various organic feeds, including chlorinated solvents, tributyl phosphate/kerosene, PCB-contaminated waste oils and solvents, booties, plastic pellets, ion exchange resins, activated carbon, radioactive-spiked organics, and well-characterized low-level liquid mixed wastes. MSO is shown to be a versatile technology for hazardous waste treatment and may be a solution to many waste disposal problems in DOE sites. The results of the demonstration conducted in FY98 has been reported [1]. In FY99 (October 1998 to …
Date:
May 1, 1999
Creator:
Adamson, M G & Hsu, P C
System:
The UNT Digital Library
Thermodynamics of the Volatilization of Actinind metals in the High-Temperature Treatment of Radioactive Wastes
We are performing a detailed study of the volatilization behavior of U, Pu and possibly Am and Np under conditions relevant to the thermal treatment (destruction) of actinide containing organic-based mixed and radioactive wastes. The primary scientific goal of the work is to develop a basic thermochemical understanding of actinide volatilization and partitioning/speciation behavior in the thermal processes that are central to DOE/EM's mixed waste treatment program. This subject addresses at least two key technical needs/problem areas recently identified by DOE/EM's Office of Science & Technology: emission-free destruction of organic wastes, and interactions between actinides and organic residues in materials stabilization. A sound basis for designing safe and effective treatment systems, and the ability to allay public concerns about radioactive fugitive emissions, will be the principal benefits of the project. The proposed work is a combination of experimental studies and thermodynamic modeling. Vapor pressure measurements will be made to determine U, Pu and possibly Am volatile species and the extent of their volatilization when UO2/U3O8, PuO2 and AmO2 solids are heated to temperatures of 500 to1200 C under pyrolyzing (reducing) conditions or under oxidizing conditions in the presence of chlorine. Work on uranium volatilization under reducing conditions is being performed …
Date:
June 1, 1999
Creator:
Adamson, Martyn, G. & Olander, Donald R.
System:
The UNT Digital Library
The Hybrid Emulsion Detector for MINOS R&D Proposal
The MINOS (Main Injector Neutrino Oscillation Search) experiment is designed to search for neutrino oscillations with a sensitivity significantly greater than has been achieved to date. The phenomenon of neutrino oscillations, whose existence has not been proven convincingly so far, allows neutrinos of one "flavor" (type) to slowly transform themselves into another flavor, and then back again to the original flavor, as they propagate through space or matter. The MINOS experiment is optimized to explore the region of neutrino oscillation "parameter space" suggested by previous investigations of atmospheric neutrinos: the Kamiokande, IMB, Super-Kamiokande and Soudan 2 experiments. The study of oscillations in this region with a neutrino beam from the Main Injector requires measurements of the beam after a very long flight path. This in turn requires an intense neutrino beam and a massive detector in order to have an adequate event rate at a great distance from the source. We propose to enhance significantly the physics capabilities of the MINOS experiment by the addition of a Hybrid Emulsion Detector at Soudan, capable of unambigous identification of the neutrino flavor. Recent developments in emulsion experiments make such a detector possible, although significant technological challenges must be overcome. We propose to …
Date:
April 1, 1999
Creator:
Adamson, P.; Alexandrov, K. V.; Allison, W. W.M.; Alner, G. J.; Ambats, I.; Anderson, B. et al.
System:
The UNT Digital Library
Physics-Based Damage Predictions for Simulating Testing and Evaluation (T and E) Experiments
This is the final report of a two-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). This report addresses the need to develop computational techniques and physics-based material models for simulating damage to weapons systems resulting from ballistic threats. Modern weapons systems, such as fighter aircraft, are becoming more dependent upon composite materials to reduce weight, to increase strength and stiffness, and to resist adverse conditions resulting from high temperatures and corrosion. Unfortunately, damaged components can have severe and detrimental effects, as evidenced by statistics from Desert Storm indicating that 75% of aircraft losses were attributable to fuel system vulnerability with hydrodynamic ram being the primary kill mechanism. Therefore, this project addresses damage predictions for composite systems that are subjected to ballistic threats involving hydrodynamic ram. A computational technique for simulating fluid-solid interaction phenomena and physics-based material models have been developed for this purpose.
Date:
March 1, 1999
Creator:
Addessio, Francis L.; Schraad, Mark W. & Lewis, Matthew W.
System:
The UNT Digital Library
The Virtual Library in Action
The SLAC Library has for many years provided SPIRES-HEP, a 300,000 record bibliographic database, to the world particle physics community via the Internet as well as through clone sites in Europe and Japan. The 1991 introduction of the e-print archives at LANL coupled with the World-Wide-Web (WWW) from CERN suddenly made it possible to provide easy linkage between bibliographic database records and the actual full-text of papers. The SLAC Library has turned this possibility into reality by converting hundreds of TeX source documents each month into viewable postscript complete with figures. These (now more than 20,000) postscript files are linked to the HEP database, and the full-text is rendered universally visible via WWW. We discuss the project, the collaboration of physicists and librarians, what is easy, what is hard, and our vision for the future.
Date:
July 2, 1999
Creator:
Addis, Louise
System:
The UNT Digital Library
An advanced control system for fine coal flotation
None
Date:
December 20, 1999
Creator:
Adel, G. T. & Luttrell, G. H.
System:
The UNT Digital Library
Investigation of Ultrasonic Wave Interaction with Fluid-Saturated Porous Rocks
None
Date:
July 1999
Creator:
Adler, L.
System:
The UNT Digital Library
Final report: Efficient thyratron modulator project
The purpose of this program was to examine methods of increasing the efficiency of producing pulses to drive Klystrons in the 150 MW range. This may include 2 Klystrons in the 75 MW range. Specific methods of interest to improve the pulse efficiency were the use of a circuit to add energy to the tail of the pulse, the use of a bipyrimidal transformer, and the use of gas insulation as a means of improving the pulse shape. These methods were investigated using both thyratron and IGBT switching. The low cost designs developed in this work consisted of low voltage designs which don't require the oil immersion. These designs can be ''hot tuned'' based on the use of simple, tunable inductors.
Date:
November 26, 1999
Creator:
Adler, R. J.; Richter-Sand, R. J. & Gregg, C. W.
System:
The UNT Digital Library
Wakefield and Beam Centering Measurements of a Damped and Detuned X-Band Accelerator Structure
In the Next Linear Collider (NLC) design, X-Band (11.4 GHz) accelerator structures are used to accelerate multibunch beams to several hundred GeV. Although these structures allow for high gradient operation, their strong deflecting modes impose a number of operational constraints. In particular, the long-range transverse wakefields generated by the bunches need to be reduced by about two orders of magnitude to prevent significant beam breakup. During the past five years, a reduction scheme that employs both detuning and damping of the structure dipole modes has been developed to meet this requirement. Several prototype Damped and Detuned Structures (DDS) have been built to test and refine this scheme. The wakefield of the latest version, DDS3, has recently been measured in the Accelerator Structure Setup (ASSET) facility at SLAC. In this paper, we present these results together with predictions based on an equivalent circuit model of the structure. We also present ASSET studies in which the beam-induced dipole signals that are coupled out for damping purposes are used to center the beam in the structure.
Date:
September 14, 1999
Creator:
Adolphsen, Chris
System:
The UNT Digital Library
Microstructural Properties of High Level Waste Concentrates and Gels with Raman And Infrared Spectroscopies
Nearly half of the high level radioactive waste stored at Hanford is composed of highly alkaline concentrates referred to as either salt cakes or Double-Shell Slurry (DSS), depending on their compositions and processing histories. The major components of these concentrates are water, sodium hydroxide, and sodium salts of nitrate, nitrite, aluminate, carbonate, phosphate, and sulfate. In addition, there are varying amounts of assorted organic salts such as EDTA, glycolate, and citrate. Although measurements of the bulk properties of these wastes (e.g. viscosity, gel point, density) have been reported, little is known about how the macroscopic characteristics are related to the microscopic physico-chemical properties. Viscosity, solids volume percent, and gas retention can dramatically change with relatively small changes in composition and temperature. Furthermore, these same properties are important in determining safe storage conditions as well as in planning retrieval, pretreatment, and disposal of the wastes. The focus of this effort will be on aluminate chemistry since large inventories of waste with aluminum are located at Hanford and Savannah River and little is known about the microstructure of these complex mixtures.
Date:
June 1, 1999
Creator:
Agnew, Stephen F. & Johnston, Clifford T.
System:
The UNT Digital Library
Microstructural Properties of High Level Waste Concentrates and Gels with raman and Infrared Spectroscopies
Background: Although aluminum species constitute a predominant proportion of tank wastes, the chemistry of aluminum in these alkaline solutions is inadequately understood. This is due, in part, to the extreme conditions of the HLW supernatant tank liquors. In REDOX waste, for example, the concentration of Al in HLW supernatants can exceed 1.5 M. In addition, the pH is often greater than 14, and the individual molar concentrations of Na+, NOi, and NOa- are in excess of 2 M. As a consequence of the high molar concentrations of A13+, Na+, NO;z-, and N03-, the activity of water in these supernatant solutions is greatly decreased. The concentration of water in these solutions, is in the range of 35-45 M, a significant reduction from the pure bulk water value of 55 M. On the molecular scale, there is not enough water present to satisfy the hydration requirements of the Na+ and AI(O) ions in the alkaline aluminum solutions. Thus, most of the water present in the HLW supernatants is chemically ''tied up'' as hydrated water around the Na+ and Al(OH)d- ions, as well as structural water present in solid aluminate hydrates. The solution-solid phase behavior of the HLW supernatants can be thought of …
Date:
June 1, 1999
Creator:
Agnew, Stephen F. & Schoonover, Jon R.
System:
The UNT Digital Library
Final Report, December, 1999. Sloan - US Department of Energy joint postdoctoral fellowship in computational molecular biology [Canonical nonlinear methods for modeling and analyzing gene circuits and spatial variations during pattern formation in embryonic development]
The modeling and analysis of the complex interactions between genes and metabolites during development require computational approaches. However, existing methods cannot efficiently account for the large number of interacting players, the nonlinear nature of the interactions, or the disparate scales involved. The latter represents a challenge in modeling developmental systems since reaction rates and diffusion times can vary by several orders of magnitude (depending on the molecular system). Modeling processes of this type results in the pathology of stiffness. Numerically, stiffness occurs when, in order to prevent large amplification of errors, typical (non-stiff) algorithms require a step size much smaller than the scale at which the solution in changing. In this work, a new method to solve large stiff systems of equations in the non-linear power law form was developed. The power-law formatism is a proven powerful tool for biological systems modeling, and has many advantages over other formalisms used for this purpose. The advantages include the fact that it is canonical, and that it is an accurate local approximation to any type of interaction. Representative results are presented.
Date:
December 1, 1999
Creator:
Agresar, Grenmarie & Savageau, Michael A.
System:
The UNT Digital Library
Hawaiian Monk Seal Epidemiology Plan: Health Assessment and Disease Status Studies
The following document provides a framework for incorporation of health and information to enhance recovery of the Hawaiian monk seal.
Date:
October 1999
Creator:
Aguirre, A. Alonso; Reif, John S. & Antonelis, George A.
System:
The UNT Digital Library
Caribbean Basin Enhancement Legislation
Legislation provides Caribbean countries similar tariff benefits as Mexico under the Caribbean and Central American Relief and Economic Stabilization Act. A senate bill provides relief to the hurricane affected countries of Central America. The senate bill is more restrictive than the House bill in the scope of tariff benefits offered.
Date:
March 26, 1999
Creator:
Ahearn, Raymond
System:
The UNT Digital Library
PARTICLE TRANSPORT AND DEPOSITION IN THE HOT-GAS FILTER AT WILSONVILLE
Particle transport and deposition in the Wilsonville hot-gas filter vessel is studied. The filter vessel contains a total of 72 filters, which are arranged in two tiers. These are modeled by six upper and one lower cylindrical effective filters. An unstructured grid of 312,797 cells generated by GAMBIT is used in the simulations. The Reynolds stress model of FLUENT{trademark} (version 5.0) code is used for evaluating the gas mean velocities and root mean-square fluctuation velocities in the vessel. The particle equation of motion includes the drag, the gravitational and the lift forces. The turbulent instantaneous fluctuation velocity is simulated by a filtered Gaussian white-noise model provided by the FLUENT code. The particle deposition patterns are evaluated, and the effect of particle size is studied. The effect of turbulent dispersion, the lift force and the gravitational force are analyzed. The results show that the deposition pattern depends on particle size. Turbulent dispersion plays an important role in transport and deposition of particles. Lift and gravitational forces affect the motion of large particles, but has no effect on small particles.
Date:
June 24, 1999
Creator:
Ahmadi, Goodarz
System:
The UNT Digital Library
Improving paper machine efficiency through on-line control of stock delivery, headbox and forming hydrodynamics
None
Date:
September 30, 1999
Creator:
Aidun, Cyrus K.
System:
The UNT Digital Library
Preliminary analysis of the failure of well EW-05, Visalia Pole Yard, February 1, 1999
None
Date:
May 14, 1999
Creator:
Aines, R D & Newmark, R
System:
The UNT Digital Library
Contaminant-Organic Complexes, Their Structure and Energetics in Surface Decontamination Processes
There are a wide variety of compounds that are naturally occurring biodegradable organic chelates (siderophores) that appear to be more effective at oxide dissolution and actinide complexation than EDTA or other organic acids now used in decontamination processes. These chelates bind hard acids [Fe(III) and actinides(IV)] with extraordinarily high affinities. For example, the binding constant for the siderophore enterobactin with iron is about 1050, and its binding constant for Pu(IV) is estimated to be as high. Hence, this project is investigating the efficacy of using siderophores (or siderophore-like chelates) as decontamination agents of metal surfaces. The specific goals of this project are as follows: 1. develop an understanding of the surface interaction between siderophores (and their functional moieties), iron, and actinide oxides; their surface chemical properties that foster their dissolution; and the conditions that maximize that dissolution 2. develop the computational tools necessary to predict the reactivity of different siderophore functional groups toward oxide dissolution and actinide(IV) solubilization 3. identify likely candidate chelates for use in decontamination processes. To meet these objectives, the project combines molecular spectroscopy and computational chemistry to provide basic information on the structure and bonding of siderophore functional groups to metal (iron and uranium) oxide specimens …
Date:
June 1999
Creator:
Ainsworth, Calvin C.; Friedrich, Donald M.; Hay, Benjamin P.; Myneni, Satish C. B. & Traina, Samuel J.
System:
The UNT Digital Library
Emissions Inventory Report Summary Reporting Requirements for the New Mexico Administrative Code, Title 20, Chapter 2, Part 73 (20 NMAC 2.73) for Calendar Year 1998
Los Alamos National Laboratory (the Laboratory) is subject to emissions reporting requirements for regulated air contaminants under Title 20 of the New Mexico Administrative Code, Chapter 2, Part 73 (20 NMAC 2.73), Notice of Intent and Emissions Inventory Requirements. The Laboratory has the potential to emit 100 tons per year of suspended particulate matter, nitrogen oxides, carbon monoxide, sulfur oxides, and volatile organic compounds. For 1998, combustion products from the industrial sources contributed the greatest amount of criteria air pollutants from the Laboratory. Research and development activities contributed the greatest amount of volatile organic compounds. Emissions of beryllium and aluminum were reported for activities permitted under 20 NMAC 2.72 Construction Permits.
Date:
September 1, 1999
Creator:
Air Quality Group, ESH-17
System:
The UNT Digital Library