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3-D Finite Element Analyses of the Egan Cavern Field
Three-dimensional finite element analyses were performed for the two gas-filled storage caverns at the Egan field, Jennings dome, Louisiana. The effects of cavern enlargement on surface subsidence, storage loss, and cavern stability were investigated. The finite element model simulated the leaching of caverns to 6 and 8 billion cubic feet (BCF) and examined their performance at various operating conditions. Operating pressures varied from 0.15 psi/ft to 0.9 psi/ft at the bottom of the lowest cemented casing. The analysis also examined the stability of the web or pillar of salt between the caverns under differential pressure loadings. The 50-year simulations were performed using JAC3D, a three dimensional finite element analysis code for nonlinear quasistatic solids. A damage criterion based on onset of dilatancy was used to evaluate cavern instability. Dilation results from the development of microfractures in salt and, hence, potential increases in permeability onset occurs well before large scale failure. The analyses predicted stable caverns throughout the 50-year period for the range of pressures investigated. Some localized salt damage was predicted near the bottom walls of the caverns if the caverns are operated at minimum pressure for long periods of time. Volumetric cavern closures over time due to creep were …
Date:
February 1, 1999
Creator:
Klamerus, E.W. & Ehgartner, B.L.
Object Type:
Report
System:
The UNT Digital Library
(6)Li, (7)Li Nuclear Magnetic Resonance Investigation of Lithium Coordination in Binary Phosphate Glasses
{sup 6}Li and {sup 7}Li solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy has been used to investigate the local coordination environment of lithium in a series of xLi{sub 2}O {center_dot} (1-x)P{sub 2}O{sub 5} glasses, where 0.05 {le} x {le} 0.55. Both the {sup 6}Li and {sup 7}Li show chemical shift variations with changes in the Li{sub 2}O concentration, but the observed {sup 6}Li NMR chemical shifts closely approximate the true isotropic chemical shift and can provide a measure of the lithium bonding environment. The {sup 6}Li NMR results indicate that in this series of lithium phosphate glasses the Li atoms have an average coordination between four and five. The results for the metaphosphate glass agree with the coordination number and range of chemical shifts observed for crystalline LiPO{sub 3}. An increase in the {sup 6}Li NMR chemical shift with increasing Li{sub 2}O content was observed for the entire concentration range investigated, correlating with increased cross-linking of the phosphate tetrahedral network by O-Li-O bridges. The {sup 6}Li chemical shifts were also observed to vary monotonically through the anomalous glass transition temperature (T{sub g}) minimum. This continuous chemical shift variation shows that abrupt changes in the Li coordination …
Date:
February 8, 1999
Creator:
Alam, T.M.; Boyle, T.J.; Brow, R.K. & Conzone, S.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 28, No. 16, Ed. 1 Friday, February 5, 1999
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 5, 1999
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 28, No. 17, Ed. 1 Friday, February 12, 1999
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 12, 1999
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 28, No. 18, Ed. 1 Friday, February 19, 1999
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 19, 1999
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 28, No. 19, Ed. 1 Friday, February 26, 1999
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 26, 1999
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
1998 Annual report on waste generation and waste minimization progress as required by DOE order 5400.1 Hanford Site
None
Date:
February 25, 1999
Creator:
SEGALL, P
Object Type:
Report
System:
The UNT Digital Library
1999 Gordon Research Conference on Mammalian DNA Repair. Final Progress Report
This Conference will examine DNA repair as the key component in genomic surveillance that is so crucial to the overall integrity and function of mammalian cells. Recent discoveries have catapulted the field of DNA repair into a pivotal position for fundamental investigations into oncology, aging, environmental health, and developmental biology. We hope to highlight the most promising and exciting avenues of research in robust discussions at this conference. This Mammalian DNA Repair Gordon Conference differs from the past conferences in this series, in which the programs were broader in scope, with respect to topics and biological systems covered. A conference sponsored by the Genetics Society in April 1998 emphasized recombinational mechanisms for double-strand break repair and the role of mismatch repair deficiency in colorectal cancer. These topics will therefore receive somewhat less emphasis in the upcoming Conference. In view of the recent mechanistic advances in mammalian DNA repair, an upcoming comprehensive DNA repair meeting next autumn at Hilton Head; and the limited enrollment for Gordon Conferences we have decided to focus session-by-session on particular areas of controversy and/or new developments specifically in mammalian systems. Thus, the principal presentations will draw upon results from other cellular systems only to the extent …
Date:
February 12, 1999
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
3D dislocation dynamics: stress-strain behavior and hardening mechanisms in FCC and BCC metals
A dislocation dynamics (DD) model for plastic deformation, connecting the macroscopic mechanical properties to basic physical laws governing dislocation mobility and related interaction mechanisms, has been under development. In this model there is a set of critical reactions that determine the overall results of the simulations, such as the stress-strain curve. These reactions are, annihilation, formation of jogs, junctions, and dipoles, and cross-slip. In this paper we discuss these reactions and the manner in which they influence the simulated stress- strain behavior in fcc and bcc metals. In particular, we examine the formation (zipping) and strength of dipoles and junctions, and effect of jogs, using the dislocation dynamics model. We show that the strengths (unzipping) of these reactions for various configurations can be determined by direct evaluation of the elastic interactions. Next, we investigate the phenomenon of hardening in metals subjected to cascade damage dislocations. The microstructure investigated consists of small dislocation loops decorating the mobile dislocations. Preliminary results reveal that these loops act as hardening agents, trapping the dislocations and resulting in increased hardening.
Date:
February 19, 1999
Creator:
Hirth, J P; Rhee, M; Zhib, H M & de la Rubia, T D
Object Type:
Report
System:
The UNT Digital Library
3D Imaging of Porous Media Using Laser Scanning Confocal Microscopy with Application to Microscale Transport Processes
We present advances in the application of laser scanning confocal microscopy (LSCM) to image, reconstruct, and characterize statistically the microgeometry of porous geologic and engineering materials. We discuss technical and practical aspects of this imaging technique, including both its advantages and limitations. Confocal imaging can be used to optically section a material, with sub-micron resolution possible in the lateral and axial planes. The resultant volumetric image data, consisting of fluorescence intensities for typically {approximately}50 million voxels in XYZ space, can be used to reconstruct the three-dimensional structure of the two-phase medium. We present several examples of this application, including studying pore geometry in sandstone, characterizing brittle failure processes in low-porosity rock deformed under triaxial loading conditions in the laboratory, and analyzing the microstructure of porous ceramic insulations. We then describe approaches to extract statistical microgeometric descriptions from volumetric image data, and present results derived from confocal volumetric data sets. Finally, we develop the use of confocal image data to automatically generate a three-dimensional mesh for numerical pore-scale flow simulations.
Date:
February 10, 1999
Creator:
Fredrich, J.T.
Object Type:
Article
System:
The UNT Digital Library
A 3D Lattice Boltzmann Code for Modeling Flow and Multi-Component Dispersion
None
Date:
February 1, 1999
Creator:
Stockman, Harian W.
Object Type:
Report
System:
The UNT Digital Library
Abilene Philharmonic Playbill: February 20-March 13, 1999
Program for an Abilene Philharmonic concert that ran from February 20th to March 13th during the 49th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
February 1999
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
The AC Quadrupole in RHIC
The report is about the AC Quadrupole in RHIC
Date:
February 25, 1999
Creator:
W., Ficsher; Jain, A. & Trbojevic, D.
Object Type:
Report
System:
The UNT Digital Library
Accelerating deactivation
In recent years, the focus of the U.S. Department of Energy (DOE) complex has shifted from defense production to facility stabilization, decommissioning, and environmental restoration. This shift from production to cleanup requires a parallel shift from operations-focused management to project-focused management for an efficient facility deactivation. In the operation-focused management organization, activities are planned and executed based on production goals and are typically repetitive and cyclic. In the project-focused management environment, activities are based on a defined scope/end objective, start date, and completion date. Since the workforce used to perform production operations is also usually relied onto perform facility deactivation, it is important to shift from an operations management approach to a project management approach. It is best if the transition is accomplished quickly so the project can move forward and workers don't spend a lot of energy anticipating change. Therefore, it is essential that managers, planners, and other workers understand the key elements associated with planning a deactivation project. This paper describes a planning approach that has been used successfully to plan deactivation projects consistent with the requirements provided in DOE Order 430.1A Life Cycle Asset Management and the companion Deactivation Implementation Guide, G430. 1A-3, while exceeding schedule expectations …
Date:
February 1, 1999
Creator:
FISHBACK, K.M.
Object Type:
Article
System:
The UNT Digital Library
Acquisition Reform: NASA's Internet Service Improves Access to Contracting Information
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO reviewed the National Aeronautics and Space Administration's (NASA) Acquisition Internet Service (NAIS), focusing on: (1) whether NAIS is an effective mechanism for disseminating procurement information to industry, including small businesses; and (2) the status of efforts to develop a governmentwide electronic procurement information system similar to NAIS."
Date:
February 9, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
An advanced ISOL facility based on ATLAS.
The Argonne concept for an accelerator complex for efficiently producing high-quality radioactive beams from ion source energy up to 6-15 MeV/u is described. The Isotope-Separator-On-Line (ISOL) method is used. A high-power driver accelerator produces radionuclides in a target that is closely coupled to an ion source and mass separator. By using a driver accelerator which can deliver a variety of beams and energies the radionuclide production mechanisms can be chosen to optimize yields for the species of interest. To effectively utilize the high beam power of the driver two-step target/ion source geometries are proposed (1) Neutron production with intermediate energy deuterons on a primary target to produce neutron-rich fission products in a secondary {sup 238}U target, and (2) Fragmentation of neutron-rich heavy ion rich fission products in a secondary beams such as {sup 18}O in a target/catcher geometry. Heavy ion beams with total energies in the 1-10 GcV range are also available for radionuclide production via high-energy spallation reactions. At the present time R and D is in progress to develop superconducting resonator structures for a driver linac to cover the energy range up to 100 MeV per nucleon for heavy ions and 200 MeV for protons. The post accelerator …
Date:
February 24, 1999
Creator:
Nolen, J. A.
Object Type:
Article
System:
The UNT Digital Library
Advanced Oil Recovery Technologies for Improved Recovery from Slope Basin Clastic Reservoirs, Nash Draw Brushy Canyon Pool, Eddy County, NM
Advanced reservoir characterization techniques are being used at the Nash Draw Brushy Canyon Pool project to develop reservoir management strategies for optimizing oil recovery from this Delaware reservoir. The reservoir characterization, geologic modeling, 3-D seismic interpretation, and simulation studies have provided a detailed model of the Brushy Canyon zones. This model was used to predict the success of different reservoir management scenarios and to aid in determining the most favorable combination of targeted drilling, pressure maintenance, well stimulation, and well spacing to improve recovery from this reservoir.
Date:
February 1, 1999
Creator:
Murphy, M. B.
Object Type:
Report
System:
The UNT Digital Library
Advanced Oil Recovery Technologies for Improved Recovery from Slope Basin Clastic Reservoirs, Nash Draw Brushy Canyon Pool, Eddy County, NM
The Nash Draw Brushy Canyon Pool in Eddy County New Mexico is a cost-shared field demonstration project in the US Department of Energy Class II Program. A major goal of the Class III Program is to stimulate the use of advanced technologies to increase ultimate recovery from slope-basin clastic reservoirs. Advanced characterization techniques are being used at the Nash Draw project to develop reservoir management strategies for optimizing oil recovery from this Delaware reservoir. Analysis, interpretation, and integration of recently acquired geologic, geophysical, and engineering data revealed that the initial reservoir characterization was too simplistic to capture the critical features of this complex formation. Contrary to the initial characterization, a new reservoir description evolved that provided sufficient detail regarding the complexity of the Brushy Canyon interval at Nash Draw. This new reservoir description is being used as a risk reduction tool to identify ''sweet spots'' for a development drilling program as well as to evaluate pressure maintenance strategies. The reservoir characterization, geological modeling, 3-D seismic interpretation, and simulation studies have provided a detailed model of the Brushy Canyon zones. This model was used to predict the success of different reservoir management scenarios and to aid in determining the most favorable …
Date:
February 24, 1999
Creator:
Murphy, Mark B.
Object Type:
Report
System:
The UNT Digital Library
Advanced Reservoir Characterization and Evaluation of CO{sub 2} Gravity Drainage in the Naturally Fractured Spraberry Trend Area
The overall goal of this project is to assess the economic feasibility of CO{sub 2} flooding the naturally fractured Spraberry Trend Area in West Texas. This objective is being accomplished by conducting research in four areas: (1) extensive characterization of the reservoirs, (2) experimental studies of crude oil/brine/rock (COBR) interactions in the reservoirs, (3) reservoir performance analysis, and, (4) experimental investigations on CO2 gravity drainage in Spraberry whole cores. This report provides results of the third year of the five-year project for each of the four areas including a status report of field activities leading up to injection of CO2.
Date:
February 3, 1999
Creator:
Schechter, D.S.
Object Type:
Report
System:
The UNT Digital Library
[Advocacy for Marcus Fellowship: School of Visual Arts, UNT]
A detailed and officially endorsed letter advocating for the admission of a fellowship applicant to the esteemed Marcus Fellows Program at the School of Visual Arts, University of North Texas (UNT).
Date:
February 22, 1999
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
[Advocacy for the Edward and Betty Marcus Fellowship: A Recommendation Letter]
A compelling letter of recommendation that fervently advocates for the selected individual applying for the prestigious Edward and Betty Marcus Fellowship.
Date:
February 27, 1999
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
The Age, Volume 22, Number 2, February 1999
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
February 1999
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Agency Performance Plans: Examples of Practices That Can Improve Usefulness to Decisionmakers
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO: (1) identified and described practices that were applied in some federal agencies' 1999 performance plans that might, if consistently applied, improve the usefulness of all agencies' annual performance plans; and (2) provided examples from agencies' fiscal year 1999 performance plans that illustrate each practice."
Date:
February 26, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Agreed-Upon Procedures: Airport and Airway Trust Fund Excise Taxes
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO reviewed whether the net excise tax revenue distributed to the Airport and Airway Trust Fund (AATF) for the fiscal year (FY) ended September 30, 1998, is supported by the underlying records."
Date:
February 25, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library