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Degree Department
Year
Month
Day
A 100-kV, 2-kA, 2.5-{micro}S Pulser for Developing and Calibrating Long-Pulse Diagnostics
The development of voltage and current probes for measuring an electron beam's current and position associated with several microsecond-long pulses from advanced Linear Induction Accelerators requires a precision pulser that can deliver both high voltages and high currents to a diagnostics Test Line. Seven-stage, type-E PFNs have been utilized in both a transformer and 4-stage Marx (plus/minus) configuration. The resulting 50-ohm pulser delivers to the Test Line a repeatable 100 kV, ca. 2 {micro}s flat-top ({+-} 1%), 2.5 {micro}s FWHM pulse with a rise time of 175 ns and 500 ns for the transformer and Marx options, respectively. Methods of reducing the rise time for both options are discussed and modeled. The coaxial Test Line is insulated at up to two atmospheres with SF{sub 6} and includes two transition regions to hold and test different diameter beam current and position monitors (BPMs). The center conductor incorporates both translation and tip/tilt with an accuracy of 100 {micro}m. Finally, the line is terminated in a matched radial resistor that provides a planar region at fields up to 40 kV/cm for the testing of voltage probes. Both the transformer and Marx options are modeled and compared to experimental results.
Date:
June 27, 1999
Creator:
Carlson, R.L.
Object Type:
Article
System:
The UNT Digital Library
Native American Initiative Short Course Management Plan
A training program is outlined for members of Native American tribes having an interest in working in the oil and gas industry. Also, the program will assist tribes whose lands have oil and gas resources to become more familiar with the industry and technology necessary to develop their resources. The proposed program will contribute to meeting the goals of the U.S. Department of Energy's (DOE) Domestic Oil and Gas Initiative to help Native American tribes become more self-sufficient in developing and managing their resources through training in cost-effective, improved technologies for hydrocarbon production that will meet environmental regulations. The training program outlined is for adult tribal representatives who are responsible for managing tribal mineral holdings or setting policy, or who work in the oil and gas industry. The course content is in response to a survey that was developed by BDM-Oklahoma and sent in the spring of 1995 to 26 tribes or tribal agencies which were identified through previous contact with DOE. Tribes were asked to indicate course content needs, levels, preferred time of year, and location. Six tribes responded with specific recommendations and needs. These tribes include the Osage, Creek, Pueblo, Cherokee, St. Regis Mohawk, Northern Arapaho, and Ute …
Date:
April 27, 1999
Creator:
Carroll, H.B.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resource Information System for Field Lab in the Osage Mineral Reservation Estate
The Osage Mineral Reservation Estate is located in Osage County, Oklahoma. Minerals on the Estate are owned by members of the Osage Tribe who are shareholders in the Estate. The Estate is administered by the Osage Agency, Branch of Minerals, operated by the U.S. Bureau of Indian Affairs (BIA). Oil, natural gas, casinghead gas, and other minerals (sand, gravel, limestone, and dolomite) are exploited by lessors. Operators may obtain from the Branch of Minerals and the Osage Mineral Estate Tribal Council leases to explore and exploit oil, gas, oil and gas, and other minerals on the Estate. Operators pay a royalty on all minerals exploited and sold from the Estate. A mineral Resource Information system was developed for this project to evaluate the remaining hydrocarbon resources located on the Estate. Databases on Microsoft Excel spreadsheets of operators, leases, and production were designed for use in conjunction with an evaluation spreadsheet for estimating the remaining hydrocarbons on the Estate.
Date:
April 27, 1999
Creator:
Carroll, H.B. & Johnson, William I.
Object Type:
Report
System:
The UNT Digital Library
Field Laboratory in the Osage Reservation -- Determination of Status of Oil and Gas Operations
Microsoft EXCEL and Lotus 1-2-3 spreadsheets have been programmed to perform calculations as reservoir data is entered. These program were developed by BDM-Oklahoma, Inc. personnel for use in the Field Laboratory in the Osage Reservation project. This spreadsheet will also assist Native American Tribe members in evaluation of the petroleum resource on the Osage Mineral Estate, Osage County, Oklahoma and independent operators to evaluate petroleum reservoirs on and off of the Osage Mineral Estate.
Date:
April 27, 1999
Creator:
Carroll, Herb & Johnson, W.I.
Object Type:
Report
System:
The UNT Digital Library
Federal Environmental Regulations Impacting Hydrocarbon Exploration, Drilling, and Production Operations
Waste handling and disposal from hydrocarbon exploration, drilling, and production are regulated by the US Environmental Protection Agency (EPA) through federal and state regulations and/or through implementation of federal regulations. Some wastes generated in these operations are exempt under the Resource Conservation and Recovery Act (RCRA) but are not exempt under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), Superfund Amendments and Reauthorization Act (SARA), and other federal environmental laws. Exempt wastes remain exempt only if they are not mixed with hazardous wastes or hazardous substances. Once mixture occurs, the waste must be disposed as a hazardous material in an approved hazardous waste disposal facility. Before the Clean Air Act as amended in 1990, air emissions from production, storage, steam generation, and compression facilities associated with hydrocarbon exploration, drilling, and production industry were not regulated. A critical proposed regulatory change which will significantly effect Class II injection wells for disposal of produced brine and injection for enhanced oil recovery is imminent. Federal regulations affecting hydrocarbon exploration, drilling and production, proposed EPA regulatory changes, and a recent significant US Court of Appeals decision are covered in this report. It appears that this industry will, in the future, fall under more …
Date:
April 27, 1999
Creator:
Carroll, Herbert B. & Johnson, William I.
Object Type:
Report
System:
The UNT Digital Library
Field Laboratory in the Osage Reservation -- Determination of the Status of Oil and Gas Operations: Task 1. Development of Survey Procedures and Protocols
Procedures and protocols were developed for the determination of the status of oil, gas, and other mineral operations on the Osage Mineral Reservation Estate. The strategy for surveying Osage County, Oklahoma, was developed and then tested in the field. Two Osage Tribal Council members and two Native American college students (who are members of the Osage Tribe) were trained in the field as a test of the procedures and protocols developed in Task 1. Active and inactive surface mining operations, industrial sites, and hydrocarbon-producing fields were located on maps of the county, which was divided into four more or less equal areas for future investigation. Field testing of the procedures, protocols, and training was successful. No significant damage was found at petroleum production operations in a relatively new production operation and in a mature waterflood operation.
Date:
April 27, 1999
Creator:
Carroll, Herbert B. & Johnson, William I.
Object Type:
Report
System:
The UNT Digital Library
Geologic Analysis of Priority Basins for Exploration and Drilling
There has been a substantial decline in both exploratory drilling and seismic field crew activity in the United States over the last 10 years, due primarily to the declining price of oil. To reverse this trend and to preserve the entrepreneurial independent operator, the U.S. DOE is attempting to encourage hydrocarbon exploration activities in some of the under exploited regions of the United States. This goal is being accomplished by conducting broad regional reviews of potentially prospective areas within the lower 48 states. Data are being collected on selected areas, and studies are being done on a regional scale generally unavailable to the smaller independent. The results of this work will be made available to the public to encourage the undertaking of operations in areas which have been overlooked until this project. Fifteen criteria have been developed for the selection of study areas. Eight regions have been identified where regional geologic analysis will be performed. This report discusses preliminary findings concerning the geology, early tectonic history, structure and potential unconventional source rocks for the Black Mesa basin and South Central states region, the two highest priority study areas.
Date:
April 27, 1999
Creator:
Carroll, Herbert B. & Reeves, T. K.
Object Type:
Report
System:
The UNT Digital Library
Exploration 3-D Seismic Field Test/Native Tribes Initiative
To determine current acquisition procedures and costs and to further the goals of the President's Initiative for Native Tribes, a seismic-survey project is to be conducted on Osage tribal lands. The goals of the program are to demonstrate the capabilities, costs, and effectiveness of 3-D seismic work in a small-operator setting and to determine the economics of such a survey. For these purposes, typical small-scale independent-operator practices are being followed and a shallow target chose in an area with a high concentration of independent operators. The results will be analyzed in detail to determine if there are improvements and/or innovations which can be easily introduced in field-acquisition procedures, in processing, or in data manipulation and interpretation to further reduce operating costs and to make the system still more active to the small-scale operator.
Date:
April 27, 1999
Creator:
Carroll, Herbert B.; Chen, K. C.; Guo, Genliang; Johnson, W. I.; Reeves, T. K., Jr. & Sharma, Bijon
Object Type:
Report
System:
The UNT Digital Library
94-A13 Native American Initiative Short Course Management Plan
A training program conducted in Bartlesville by BDM-Oklahoma technical staff, which included geologists, geophysicists, exploration and drilling specialists, and environmental policy experts. The proposed training schedule offered four courses per year and included those coursed identified by the tribes in the survey. The training program was outlined for members of Native American Tribes whose lands have oil and gas resources. The proposed program contributed to meeting the goals of the U.S. Department of Energy's (DOE) Domestic Oil and Gas Initiative to help Native American tribes become more self-sufficient in developing and managing their resources through training in cost-effective, improved technologies for hydrocarbon production that will meet environmental regulations. The training program outlined was for adult tribal representatives who are responsible for managing tribal mineral holdings or setting policy, or who work in the oil and gas industry. The course content is in response to a survey that was developed by BDM-Oklahoma and sent in the Spring of 1995 to 26 tribal agencies identified through previous contact with DOE. Tribes were asked to indicate course content needs, levels, preferred time of year, and location. Six tribes responded with specific recommendations and needs. These tribes, were the Creek, Pueblo, Cherokee, St. Regis …
Date:
April 27, 1999
Creator:
Carroll, Herbert B.; Johnson, William I. & Kokesh, Judith H.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 258, Ed. 1 Friday, August 27, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 27, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 284, Ed. 1 Monday, September 27, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 27, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 310, Ed. 1 Wednesday, October 27, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 27, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 49, Ed. 1 Monday, December 27, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 27, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Inflation and the Real Minimum Wage: Fact Sheet
Because the minimum wage is not indexed to the price level, it has been legislatively increased from time to time to make up for the loss in its real value due to inflation. In nominal terms, the minimum wage has risen steadily since 1938 from 25 cents an hour to $5.15 where it now stands. But the legislated adjustments to the minimum wage have occurred at irregular intervals. As a result, there has been significant variation in the purchasing power of the minimum wage.
Date:
January 27, 1999
Creator:
Cashell, Brian W.
Object Type:
Report
System:
The UNT Digital Library
The ARM-GCSS Intercomparison Study of Single-Column Models and Cloud System Models
The Single-Column Model (SCM) Working Group (WC) and the Cloud Working Group (CWG) in the Atmospheric Radiation Measurement (ARM) Program have begun a collaboration with the GEWEX Cloud System Study (GCSS) WGs. The forcing data sets derived from the special ARM radiosonde measurements made during the SCM Intensive Observation Periods (IOPs), the wealth of cloud and related data sets collected by the ARM Program, and the ARM infrastructure support of the SCM WG are of great value to GCSS. In return, GCSS brings the efforts of an international group of cloud system modelers to bear on ARM data sets and ARM-related scientific questions. The first major activity of the ARM-GCSS collaboration is a model intercomparison study involving SCMs and cloud system models (CSMs), also known as cloud-resolving or cloud-ensemble models. The SCM methodologies developed in the ARM Program have matured to the point where an intercomparison will help identify the strengths and weaknesses of various approaches. CSM simulations will bring much additional information about clouds to evaluate cloud parameterizations used in the SCMs. CSMs and SCMs have been compared successfully in previous GCSS intercomparison studies for tropical conditions. The ARM Southern Great Plains (SGP) site offers an opportunity for GCSS …
Date:
October 27, 1999
Creator:
Cederwall, R.T.; Rodriques, D.J.; Krueger, S.K. & Randall, D.A.
Object Type:
Article
System:
The UNT Digital Library
Finite difference micromagnetic simulation with self-consistent currents and smooth surfaces
A micromagnetic algorithm has been developed using the finite difference method (FDM). Elliptic field equations are solved on the mesh using the efficient Dynamic Alternating Direction Implicit method. Smooth surfaces have been included in the FDM formulation so structures of irregular shape can be modeled. The current distribution and temperature of devices are also calculated. Keywords: Micromagnetic simulation, Magnetic dots, Read heads, Thermal Effects
Date:
May 27, 1999
Creator:
Cerjan, C.; Gibbons, M. R.; Hewett, D. W. & Parker, G.
Object Type:
Article
System:
The UNT Digital Library
Energy Dissipation in the Target Station of the Spallation Neutron Source
The heat distributions within the components of the target station of the Spallation Neutron Source were calculated using the Monte Carlo codes HETC, LAHET and MCNP to track the cascade of events after the introduction of 1 GeV protons in the mercury target. The boundaries of the model are the proton window and the external reflectors and includes such components as the stainless steel container, the water coolant, the thermal and cold neutron sources and the beam tubes. The calculations show that detailed heat distributions are sensitive to the proton beam profile and the curvature of the surface penetrated by the proton beam.
Date:
September 27, 1999
Creator:
Charlton, L. A. & Difilippo, F. C.
Object Type:
Article
System:
The UNT Digital Library
Approach toward development of release standards for D and D cleanup.
The release of materials containing residual radioactivity from a controlled environment in decontamination and decommissioning (D&D) activities has been problematic. The primary impediment to such a release is the lack of a suitable framework within which release standards can be developed. The concept of clearance for radioactive materials was recently introduced by the International Atomic Energy Agency (IAEA) (l). This concept is being evaluated by the international regulatory communities as a basis for setting standards for releasing from control solid materials containing residual radioactivity. Accordingly, both the IAEA (2) and the European Commission (EC) (3) have recently proposed clearance standards. In the US, the Nuclear Regulatory Commission (USNRC) has just begun its rule-making process on clearance. The term ''clearance'' was introduced as a regulatory process for releasing radioactive materials posing negligible risks. A trivial risk level has been determined to be a 10{sup {minus}6} to 10{sup {minus}7} annual risk to an exposed individual, and a population risk of no more than 0.1 for an annual practice. Under these strict constraints, exposure scenarios would be developed to estimate potential doses to affected individuals. Such scenarios may account for processing, disposal, and product end-use of materials. This paper discusses these scenarios and …
Date:
January 27, 1999
Creator:
Chen, S. Y.
Object Type:
Article
System:
The UNT Digital Library
Design considerations and performance of a scalable version of a nonhydrostatic atmospheric model
The Naval Research Laboratory's Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) is being developed into a parallel, scalable model in a joint collaborative effort with Lawrence Livermore National Laboratory. The initial focus is on the atmospheric forecast model, which solves a coupled, three-dimensional set of dynamical equations using finite differences. A distributed/shared memory parallel programming paradigm is used. Distributed memory parallelism is achieved through a two-dimensional domain decomposition technique, with internodal communication accomplished using Message Passing Interface (MPI), and OpenMP is used to provide parallelism within a node. Initial performance results on both the IBM-SP and Cray-T3E are presented.
Date:
April 27, 1999
Creator:
Chen, S.; Hodur, R. M.; Mirin, A. A.; Schmidt, J. M. & Sugiyama, G.
Object Type:
Article
System:
The UNT Digital Library
The Sealy News (Sealy, Tex.), Vol. 112, No. 61, Ed. 1 Tuesday, July 27, 1999
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
July 27, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
The Sealy News (Sealy, Tex.), Vol. 112, No. 70, Ed. 1 Friday, August 27, 1999
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
August 27, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
Calculation of DWPF Canister Decay Heat for Sludge Macro-Batches 1B to 9
The rates of heat generation of DWPF glass canisters due to radioactive decay have been estimated for the remaining nine macro-batches of sludge feed. The estimated decay heat ranged from 177.5 Watts for each Macro-batch 1B canister to 498.4 Watts for each Macro-batch 8 canister. These projections are based on the HLW radionuclide inventory data available as of 4/1/98, and do not reflect further decay since then. It was assumed that each DWPF glass canister would also contain a nominal quantity of salt waste based on the reference coupled feed flowsheet. Issue of this report successfully closes a recent technical assistance request (HLW/DWPF-TAR-990003).
Date:
April 27, 1999
Creator:
Choi, A. S.
Object Type:
Report
System:
The UNT Digital Library
A Batch Wafer Scale LIGA Assembly and Packaging Technique vai Diffusion Bonding
A technique using diffusion bonding (or solid-state welding) has been used to achieve batch fabrication of two- level nickel LIGA structures. Interlayer alignment accuracy of less than 1 micron is achieved using press-fit gauge pins. A mini-scale torsion tester was built to measure the diffusion bond strength of LIGA formed specimens that has shown successful bonding at temperatures of 450"C at 7 ksi pressure with bond strength greater than 100 Mpa. Extensions to this basic process to allow for additional layers and thereby more complex assemblies as well as commensurate packaging are discussed.
Date:
January 27, 1999
Creator:
Christenson, T.R. & Schmale, D.T.
Object Type:
Article
System:
The UNT Digital Library
Deep X-Ray Lithography Based Fabrication of Rare-Earth Based Permanent Magnets and their Applications to Microactuators
Precision high aspect-ratio micro molds constructed by deep x-ray lithography have been used to batch fabricate accurately shaped bonded rare-earth based permanent magnets with features as small as 5 microns and thicknesses up to 500 microns. Maximum energy products of up to 8 MGOe have been achieved with a 20%/vol. epoxy bonded melt-spun isotropic Nd2Fe14b powder composite. Using individually processed sub- millimeter permanent sections multipole rotors have been assembled. Despite the fact that these permanent magnet structures are small, their magnetic field producing capability remains the same as at any scale. Combining permanent magnet structures with soft magnetic materials and micro-coils makes possible new and more efficient magnetic microdevices.
Date:
January 27, 1999
Creator:
Christenson, T.R.; Garino, T.J. & Venturini, E.L.
Object Type:
Article
System:
The UNT Digital Library