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Magnetoresistance of One-Dimensional Subbands in Tunnel-Coupled Double Quantum Wires
We study the low-temperature in-plane magnetoresistance of tunnel-coupled quasi-one-dimensional quantum wires. The wires are defined by two pairs of mutually aligned split gates on opposite sides of a < 1 micron thick AlGaAs/GaAs double quantum well heterostructure, allowing independent control of their widths. In the ballistic regime, when both wires are defined and the field is perpendicular to the current, a large resistance peak at ~6 Tesla is observed with a strong gate voltage dependence. The data is consistent with a counting model whereby the number of subbands crossing the Fermi level changes with field due to the formation of an anticrossing in each pair of 1D subbands.
Date:
April 27, 1999
Creator:
Blount, M. A.; Lyo, S. K.; Moon, J. S.; Reno, J. L.; Simmons, J. A. & Wendt, J. R.
Object Type:
Article
System:
The UNT Digital Library
Mars to orbit with pumped hydrazine
A propulsion point design is presented for lifting geological samples from Mars. Vehicle complexity is kept low by choosing a monopropellant single stage. Little new development is needed, as miniature pump fed hydrazine has been demonstrated. Loading the propellant just prior to operation avoids structural, thermal, and safety constraints otherwise imposed by earlier mission phases. Hardware mass and engineering effort are thereby diminished. The Mars liftoff mass is 7/8 hydrazine, <5% propulsion hardware, and >3% each for the payload and guidance.
Date:
April 27, 1999
Creator:
Whitehead, J C
Object Type:
Article
System:
The UNT Digital Library
Medicare Managed Care Plans: Many Factors Contribute to Recent Withdrawals; Plan Interest Continues
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on managed care plans' decisions to leave the Medicare program or to reduce the geographic areas that they serve, focusing on: (1) plans that receive capitated payments; (2) the patterns of plan and beneficiary participation in managed care; (3) factors associated with plans' decisions to enter or leave the Medicare Choice program; and (4) changes in plans' benefit packages and premiums."
Date:
April 27, 1999
Creator:
United States. General Accounting Office.
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
Modeling Explosive/Rock Interaction During Presplitting Using ALE Computational Methods
Arbitrary Lagrangian Eulerian (ALE) computational techniques allow treatment of gases, liq- uids, and solids in the same simulation. ALE methods include the ability to treat shockwaves in gases, liquids, and solids and the interaction of shockwaves with each other and with media from one of the other categories. ALE codes can also treat explosive detonation and the expansion of the explosive gases and their interaction with air and solids. ALEGRA is a 3-DALE code that has been developed at Sandia National Laboratories over the past few years. ALEGRA has been applied to a 2-D simulation of presplitting using decoupled explosives in rock blasting with very interesting results. The detonation of the explosive at the bottom of the hole sends a shock wave up the borehole driven by the explosive gas expanding into air. The explosive gas compresses the air against the stemming column where it rebounds and recompresses at the bottom of the borehole. This type of ringing takes several cycles to damp out. The explosively induced expansion of the borehole is also treated by ALEGRA as well as the shock wave imparted to the rock. The presentation of this paper will include sev- eral computer animations to aid in …
Date:
April 27, 1999
Creator:
Jensen, Richard P. & Preece, Dale S.
Object Type:
Article
System:
The UNT Digital Library
Native American Conference on Petroleum Energy; November 16-17, 1996; Bartlesville, Oklahoma
Thirty-three Native American tribal members, council members, and other interested parties gathered in Bartlesville, Oklahoma, to attend the Native American Conference on Petroleum Energy on October 16 and 17 1996, sponsored by the U.S. Department of Energy and BDM-Oklahoma, Inc. Tribes represented at the workshop included the Cherokee, Chickasaw, Hopi, Jicarilla Apache, Osage, Seminole, and Ute. Representatives of the Bureau of Indian Affairs (BIA), the Bureau of Land Management (BLM), and the Minerals Management Service (MMS) also attended. BDM-Oklahoma developed and organized the Native American Conference on Petroleum Energy to help meet the goals of the U.S. Department of Energy's Domestic Gas and Oil Initiative to help Native American Tribes become more self-sufficient in developing and managing petroleum resources.
Date:
April 27, 1999
Creator:
unknown
Object Type:
Report
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
Native American Training Program in Petroleum Technology
This report outlines a comprehensive training program for members of Native American tribes whose lands have oil and gas resources. The program has two components: short courses and internships. Programs are proposed for: (1) adult tribes representatives who are responsible for managing tribal mineral holdings, setting policy, or who work in the oil and gas industry; (2) graduate and undergraduate college students who are tribal members and are studying in the appropriate fields; and (3) high school and middle school teachers, science teachers. Materials and program models already have been developed for some components of the projects. The plan is a coordinated, comprehensive effort to use existing resources to accomplish its goals. Partnerships will be established with the tribes, the BIA, tribal organizations, other government agencies, and the private sector to implement the program.
Date:
April 27, 1999
Creator:
Ho, Winifred M. & Kokesh, Judith H.
Object Type:
Report
System:
The UNT Digital Library
New Constraints on Chiral Gauge Theories
Recently, a new constraint on the structure of a wide class of strongly coupled field theories has been proposed. It takes the form of an inequality limiting the number of degrees of freedom in the infrared description of a theory to be no larger than the number of underlying, ultraviolet degrees of freedom. Here we apply this inequality to chiral gauge theories. For some models we find that it is always satisfied, while for others we find that the assumption of the validity of the inequality implies a strong additional restriction on the spectrum of massless composite particles.
Date:
April 27, 1999
Creator:
Schmaltz, Martin
Object Type:
Report
System:
The UNT Digital Library
Plan for Management of Mineral Assess on Native Tribal Lands and for Formation of a Fully Integrated Natural Gas and Oil Exploration and Production Company
This report describes a plan for Native American tribes to assume responsibility for and operation of tribal mineral resources using the Osage Tribe as an example. Under this plan, the tribal council select and employ a qualified Director to assume responsibility for management of their mineral reservations. The procurement process should begin with an application for contracting to the Bureau of Indian Affairs. Under this plan, the Director will develop strategies to increase income by money management and increasing exploitation of natural gas, oil, and other minerals.
Date:
April 27, 1999
Creator:
Blechner, Michael H.; Carroll, Herbert B. & Johnson, William I.
Object Type:
Report
System:
The UNT Digital Library
Protocol for Appraisal of Petroleum Producing Properties on Native American Tribal Lands
Petroleum is currently produced on Native American Tribal Lands and has been produced on some of these lands for approximately 100 years. As these properties are abandoned at a production level that is considered the economic limit by the operator, Native American Tribes are considering this an opportunity to assume operator status to keep the properties producing. In addition to operating properties as they are abandoned, Native American Tribes also are assuming liabilities of the former operator(s) and ownership of equipment left upon abandonment. Often, operators are assumed by Native American Tribes without consideration of the liabilities left by the former operators. The purpose of this report is to provide protocols for the appraisal of petroleum producing properties and analysis of the petroleum resource to be produced after assuming operations. The appraisal protocols provide a spreadsheet for analysis of the producing property and a checklist of items to bring along before entering the property for onsite appraisal of the property. The report will provide examples of some environmental flags that may indicate potential liabilities remaining on the property left unaddressed by previous operators. It provides a starting point for appraisal and analysis of a property with a basis to make …
Date:
April 27, 1999
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Role of the President in Budget Development
The Budget and Accounting Act of 1921 established the executive budget process, which requires the President to prepare and submit a comprehensive federal budget to Congress each year for the fiscal year that begins on October 1. The President sets out his national priorities and proposes policy initiatives in the federal budget submitted to Congress soon after Congress convenes in January. The President's budget submission provides him the opportunity to influence the agenda for the upcoming budget and policy debate in Congress.
Date:
April 27, 1999
Creator:
Heniff, Bill, Jr.
Object Type:
Report
System:
The UNT Digital Library
Sandia's Geothermal Advanced Drill Rig Instrumentation Assists Critical Oil and Gas Drilling Operation
On November 23, 1998, an 18,000-foot-deep wild-cat natural gas well being drilled near Bakersfield, CA blew out and caught fire. All attempts to kill this well failed, and the well continues to flow under limited control, producing large volumes of natural gas, salt water, and some oil. The oil and some of the water is being separated and trucked off site, and the remaining gas and water is being burned at the well head. A relief well is being drilled approximately one-quarter mile away in an attempt to intercept the first well. If the relief well is successful, it will be used to cement in and kill the first well. Epoch Wellsite Services, Inc., the mud-logging company for the initial well and the relief well, requested Sandia's rolling float meter (RFM) for these critical drilling operations. The RFM is being used to measure the mud outflow rate and detect kicks while drilling the relief well, which will undoubtedly encounter reservoir conditions similar to those responsible for the blow out. Based on its prior experience with the RFM, Epoch believes that it is the only instrument capable of providing the level of accuracy and response to mudflow needed to quickly detect …
Date:
April 27, 1999
Creator:
Staller, George E. & Whitlow, Gary
Object Type:
Article
System:
The UNT Digital Library
Task 5. Native [American] Tribes Training Initiative and Outreach Work Authorization 97-A02: Field Demonstrations in High Priority Reservoirs
Twenty-seven Native American tribal members, council members, and other interested parties gathered in Santa Fe, New Mexico, to attend the Native American Workshop on Petroleum Energy on August 11 and 12, 1997, sponsored by the U.S. Department of Energy and presented by BDM-Oklahoma, Inc, staff. Tribes represented at the workshop included the Jicarilla Apache, Pueblo of Acoma and Ute. Representatives of the Environmental Protection Agency (USEPA), Bureau of Indian Affairs (BIA), Bureau of Land Management (BLM), and Minerals Management Service (MMS) also attended. BDM-Oklahoma developed and organized the Native American Workshop on Petroleum Energy to help meet the goals of the U.S. Department of Energy's Domestic Gas and Oil Initiative to help Native American tribes become more self-sufficient in developing and managing petroleum resources.
Date:
April 27, 1999
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Texas Racing Commission Annual Report: 1998
Annual report of the Texas Racing Commission describing goals, activities, and accomplishments during fiscal year 1998
Date:
April 27, 1999
Creator:
Texas Racing Commission
Object Type:
Report
System:
The Portal to Texas History
Wilson loops in minimal surfaces
The AdS/CFT correspondence suggests that the Wilson loop of the large N gauge theory with N = 4 supersymmetry in 4 dimensions is described by a minimal surface in AdS{sub 5} x S{sup 5}. The authors examine various aspects of this proposal, comparing gauge theory expectations with computations of minimal surfaces. There is a distinguished class of loops, which the authors call BPS loops, whose expectation values are free from ultra-violet divergence. They formulate the loop equation for such loops. To the extent that they have checked, the minimal surface in AdS{sub 5} x S{sup 5} gives a solution of the equation. The authors also discuss the zig-zag symmetry of the loop operator. In the N = 4 gauge theory, they expect the zig-zag symmetry to hold when the loop does not couple the scalar fields in the supermultiplet. They will show how this is realized for the minimal surface.
Date:
April 27, 1999
Creator:
Drukker, Nadav; Gross, David J. & Ooguri, Hirosi
Object Type:
Report
System:
The UNT Digital Library
Year 2000 Computing Crisis: Readiness of Medicare and the Health Care Sector
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the readiness of automated systems that support the nation's delivery of health benefits and services to function reliably without interruption through the turn of the century."
Date:
April 27, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Year 2000: Financial Institution and Regulatory Efforts to Address International Risks
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the international risks that the year 2000 computer problem poses to U.S. financial institutions, focusing on the extent to which: (1) large, internationally active U.S. financial institutions were addressing international year 2000 risks; (2) U.S. banking and securities regulators were overseeing these risks for the institutions they regulate; (3) large foreign financial institutions and their regulators are addressing the year 2000 risks; and (4) other issues may require attention before 2000 arrives."
Date:
April 27, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Z-Area Saltstone Disposal Facility Groundwater Monitoring Report (1998 Annual Report)
In accordance with SRS Z-Area Saltstone Industrial Solid Waste Permit, wells ZBG-1, ZBG-1A and ZBG-2 are monitored for the parameters listed in this document. Sampling was done during the first and third quarters of 1998. Additional Analyses were also run. The analytical results appear in Appendix 1.
Date:
April 27, 1999
Creator:
Wells, D.
Object Type:
Report
System:
The UNT Digital Library
Animal Waste Management and the Environment: Background for Current Issues
This report addresses the Background and the then current issues related to Animal Waste Management and the Environment.This background report describes the livestock production industry along with the public health and environmental concerns related to the industry.
Date:
April 26, 1999
Creator:
Copeland, Claudia & Zinn, Jeffrey
Object Type:
Report
System:
The UNT Digital Library
Assisted Living: Quality-of-Care and Consumer Protection Issues
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed quality-of-care and consumer protection issues in assisted living facilities in California, Florida, Ohio, and Oregon, focusing on: (1) residents' needs and the services provided in assisted living facilities; (2) the extent to which facilities provide consumers with sufficient information for them to choose a facility that is appropriate for their needs; (3) the four states' approaches to oversight of assisted living; and (4) the types of quality-of-care and consumer protection problems they identify."
Date:
April 26, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Assisted Living: Quality-of-Care and Consumer Protection Issues in Four States
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on whether consumers are able to make informed choices about their care and about the nature and extent of problems that may be occurring in assisted living, focusing on: (1) residents' needs and the services provided in assisted living facilities; (2) the extent to which facilities provide consumers with information sufficient to help them choose a facility that is appropriate for their needs; (3) state approaches to the oversight of assisted living; and (4) the type and frequency of quality-of-care and consumer protection problems identified by Congress."
Date:
April 26, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Beneficial Use and Recycling of Municipal Waste Combustion Residues - A Comprehensive Resource Document
This document summarizes information from worldwide sources on the beneficial use of residues from the combustion of municipal. The information presented, including results of numerous research projects, field demonstrations, and actual full-scale projects, demonstrates that the ash can be safely used. It includes data on ash characteristics, environmental considerations, guidance on selected ash use applications, and information on federal and state regulations and policies affecting ash use.
Date:
April 26, 1999
Creator:
Wiles, C. & Shepherd, P.
Object Type:
Book
System:
The UNT Digital Library
A Case for Government-Industry Partnerships
Government-industry partnerships are necessary for small businesses to successfully launch new and innovative ideas into the market place. Small businesses, the cornerstone for economic job creation, expansion and retention, is hampered with the need to fund new and innovative technologies from profits which generally occur in a cyclic manner. This cyclic funding leads to ramp ups and development during profitable years, and delays and abeyance during years of downturn. Government-industry partnerships directly addresses this problem by offering funding assistance in the form of resources eliminating the ''peaks and valleys'' of development. This paper will detail a case study of this type of assistance.
Date:
April 26, 1999
Creator:
Purgert, Robert M.
Object Type:
Article
System:
The UNT Digital Library