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18,179 Matching Results
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Improved Tubulars for Better Economics in Deep Gas Well Drilling using Microwave Technology Annual Report: 2005
The objective of the research program has been to improve the rate-of-penetration in deep hostile environments by improving the life cycle and performance of coiled-tubing, an important component of a deep well drilling system for oil and gas exploration. The current process of the manufacture long tubular steel products consists of shaping the tube from flat strip, welding the seam and sections into lengths that can be miles long, and coiling onto reels. However, the welds, that are a weak point, now limit the performance of the coil tubing. This is not only from a toughness standpoint but also from a corrosion standpoint. By utilizing the latest developments in the sintering of materials with microwave energy and powder metal extrusion technology for the manufacture of seamless coiled tubing and other tubular products, these problems can be eliminated. The project is therefore to develop a continuous microwave process to sinter continuously steel tubulars and butt-join them using microwave/induction process. The program started about three years ago and now we are in the middle of Phase II. In Phase I (which ended in February 2005) a feasibility study of the extrusion process of steel powder and continuously sinter the extruded tubing was …
Date:
February 1, 2006
Creator:
Agrawal, Dinesh; Gigl, Paul & Dennis, Mahlon
Object Type:
Report
System:
The UNT Digital Library
Landfill cover revegetation using organic amendments and cobble mulch in the arid southwest
Cobble mulch and composted biosolids, greenwaste, and dairy manure were added to arid soil in an attempt to improve plant establishment and production, minimize erosion, increase evapotranspiration, and reduce leaching. Twenty-four plots (10 x 10 m) were established in a completely randomized block design (8 treatments, 3 plots per treatment). Treatments included (1) non-irrigated control, (2) irrigated control, (3) non-irrigated greenwaste compost (2.5 yd{sup 3} per plot), (4) irrigated greenwaste compost (5 yd{sup 3} per plot), (5) non-irrigated biosolids compost (2.5 yd{sup 3} per plot), (6) irrigated biosolids compost (5 yd{sup 3} per plot), (7) cobble-mulch, and (8) non-irrigated dairy manure compost (2.5 yd{sup 3} per plot). Soil samples were collected from each plot for laboratory analyses to assess organic matter contents, macro-nutrient levels and trace metal contents, and nitrogen mineralization potential. All plots were seeded similarly with approximately equal portions of cool and warm season native grasses. The organic composts (greenwaste, biosolids, dairy manure) added to the soils substantially increased soil organic matter and plant nutrients including total nitrogen and phosphorus. However, the results of a laboratory study of the soils' nitrogen mineralization potential after the application of the various composts showed that the soil nitrogen-supplying capability decreased to …
Date:
February 1, 2000
Creator:
Aguilar, Richard; Dwyer, Stephen F.; Reavis, Bruce A.; Newman, Gretchen Carr & Loftin, Samuel R.
Object Type:
Report
System:
The UNT Digital Library
Neutron capture cross sections of 151,153Eu
None
Date:
February 13, 2008
Creator:
Agvaanluvsan, U.; Becker, J. A.; Macri, R. A.; Parker, W. E.; Wilk, P. A.; Wu, C. Y. et al.
Object Type:
Report
System:
The UNT Digital Library
Measurement of the nue and Total 8B Solar Neutrino Fluxes with theSudbury Neutrino Observatory Phase I Data Set
This article provides the complete description of resultsfrom the Phase I data set of the Sudbury Neutrino Observatory (SNO). ThePhase I data set is based on a 0.65 kt-year exposure of heavy water tothe solar 8B neutrino flux. Included here are details of the SNO physicsand detector model, evaluations of systematic uncertainties, andestimates of backgrounds. Also discussed are SNO's approach tostatistical extraction of the signals from the three neutrino reactions(charged current, neutral current, and elastic scattering) and theresults of a search for a day-night asymmetry in the ?e flux. Under theassumption that the 8B spectrum is undistorted, the measurements fromthis phase yield a solar ?e flux of ?(?e) =1.76+0.05?0.05(stat.)+0.09?0.09 (syst.) x 106 cm?2 s?1, and a non-?ecomponent ?(? mu) = 3.41+0.45?0.45(stat.)+0.48?0.45 (syst.) x 106 cm?2s?1. The sum of these components provides a total flux in excellentagreement with the predictions of Standard Solar Models. The day-nightasymmetry in the ?e flux is found to be Ae = 7.0 +- 4.9 (stat.)+1.3?1.2percent (sys.), when the asymmetry in the total flux is constrained to bezero.
Date:
February 1, 2007
Creator:
Aharmim, B.; Ahmad, Q. R.; Ahmed, S. N.; Allen, R. C.; Andersen, T. C.; Anglin, J. D. et al.
Object Type:
Article
System:
The UNT Digital Library
European Trade Retaliation: The FSC-ETI Case
None
Date:
February 11, 2005
Creator:
Aheam, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
European Union–U.S. Trade and Investment Relations: Key Issues
None
Date:
February 14, 2008
Creator:
Aheam, Raymond J.; Fischer, John W.; Goldfarb, Charles B.; Hanrahan, Charles E.; Eubanks, Walter W. & Rubin, Janice E.
Object Type:
Report
System:
The UNT Digital Library
Morocco-U.S. Free Trade Agreement
This report discusses the free trade agreement (FTA) between United States and Morocco. The United States and Morocco reached agreement on March 2, 2004 to create a free trade agreement.
Date:
February 16, 2006
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Trade Legislation in the 106th Congress: An Overview
None
Date:
February 8, 2000
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
U.S.-European Union Trade Relations: Issues and Policy Challenges
None
Date:
February 10, 2005
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
U.S.-Thailand Free Trade Agreement Negotiations
None
Date:
February 6, 2006
Creator:
Ahearn, Raymond J. & Morrison, Wayne M.
Object Type:
Report
System:
The UNT Digital Library
High-Level Waste Melter Review
The U.S. Department of Energy (DOE) is faced with a massive cleanup task in resolving the legacy of environmental problems from years of manufacturing nuclear weapons. One of the major activities within this task is the treatment and disposal of the extremely large amount of high-level radioactive (HLW) waste stored at the Hanford Site in Richland, Washington. The current planning for the method of choice for accomplishing this task is to vitrify (glassify) this waste for disposal in a geologic repository. This paper describes the results of the DOE-chartered independent review of alternatives for solidification of Hanford HLW that could achieve major cost reductions with reasonable long-term risks, including recommendations on a path forward for advanced melter and waste form material research and development. The potential for improved cost performance was considered to depend largely on increased waste loading (fewer high-level waste canisters for disposal), higher throughput, or decreased vitrification facility size.
Date:
February 26, 2002
Creator:
Ahearne, J.; Gentilucci, J.; Pye, L. D.; Weber, T.; Woolley, F.; Machara, N. P. et al.
Object Type:
Article
System:
The UNT Digital Library
RF gas plasma source development for heavy ion fusion
Presently the Heavy Ion Fusion Virtual National Laboratory is researching ion sources and injector concepts to understand how to optimize beam brightness over a range of currents (50-2000 mA argon equivalent). One concept initially accelerates millimeter size, milliamp beamlets to 1 MeV before merging them into centimeter size, ampere beams. Computer simulations have shown the final brightness of the merged beams is dominated by the emittance growth of the merging process, as long as the beamlets ion temperature is below a few eV. Thus, a RF multicusp source capable of high current density can produce beams with better brightness compared to ones extracted from a colder source with a large aperture and lower current density. As such, experiments have begun to develop a RF multicusp source capable of delivering one amp of extracted beam current. It is expected that it will require 10 kW of 13 MHz RF power delivered via a quartz shielded, one and half turn, four inch diameter antenna. Important considerations in the development of the source include the dependence of current density and beam ion temperature on consumed RF power and gas pressure. A fast rise time ({approx}100 ns) for the extracted beam pulse must also …
Date:
February 22, 2002
Creator:
Ahle, L.E.; Hall, R.P. & Molvik, A.W.
Object Type:
Article
System:
The UNT Digital Library
Commercial Application of Plasma Mass Separation in the Archimedes Filter Plant
This paper describes the commercial application of an innovative plasma mass separator called the Archimedes Filter to a pre-treatment plant that can be integrated into the U.S. Department of Energy (DOE) Hanford and Savannah River Sites to significantly enhance the treatment of radioactive high-level waste. The output of the Archimedes Filter is completely compatible with existing waste immobilization processes such as vitrification and requires no new waste form to be developed. A full-geometric-scale Demonstration Filter Unit (DEMO) has been constructed and is undergoing initial testing at the Archimedes Technology Group Development Facilities in San Diego. Some of the technology and engineering development is being performed by other organizations in collaboration with Archimedes. The Commissariat a l'Energie Atomique (CEA) is developing the plasma calcination technology and all of the associated systems for AFP feed preparation. Two Russian institutes are involved in the development of the ICP torch and injector system. The Remote System Group (UT-Battelle) at ORNL is developing the remote maintenance system for the filter units. Conceptual design of the Archimedes Filter Plant (AFP) is being developed concurrently with the DEMO testing program. The AFP mission is to significantly reduce the cost and accelerate the rate of vitrification of high-level …
Date:
February 27, 2003
Creator:
Ahlfeld, C.E.; Gilleland, J.G. & Wagoner, J.D.
Object Type:
Article
System:
The UNT Digital Library
Walla Walla River Basin Screening, Annual Report 2002.
In order to meet the need for protective fish screening, the Walla Walla County Conservation District (WWCCD) and the Washington Department of Fish and Wildlife (WDFW) formed a partnership to implement the WDFW Cooperative Compliance Review and Cost-Share Program. The program provides technical and financial assistance to irrigators in order to bring existing surface water diversions into compliance with state and federal juvenile fish screen criteria. The Walla Walla basin has two priority salmonid species currently listed as threatened under the Endangered Species Act, the Bull Trout and Mid-Columbia Basin Steelhead. Other partners in this effort include the Washington Department of Ecology, National Marine Fisheries Service, US Fish and Wildlife Service, and the Walla Walla Community College Irrigation Department. A Screening Oversight Committee of representatives from these agencies sets policy and resolves issues.
Date:
February 1, 2003
Creator:
Ahmann, Audrey & Jones, Rick
Object Type:
Report
System:
The UNT Digital Library
Study of Charmed Baryon Sigma(C)(2800) Production at the BaBar Experiment
This dissertation reports on a study of search for an orbitally excited state of charmed baryons {Sigma}{sub c}{sup 0}(2800) and {Sigma}{sub c}{sup ++}(2800). They measure the widths, momentum spectrum and production cross-section for these states decaying into a {Lambda}{sub c}{sup +} and a charged {pi}. The analysis uses 230 fb{sup -1} of data collected at BABAR detector operating at PEP-II collider at Stanford Linear Accelerator Center. The data is collected in the region of {Upsilon}(4S) an {approx} 40 MeV below the resonance. {Lambda}{sub c}{sup +} baryon is reconstructed in the decay mode pK{sup -}{pi}{sup +}. The {Sigma}{sub c}(2800) baryon production at continuum is observed to be quite significant for x{sub p} > 0.7, where x{sub p} = p/{radical}E{sup 2}+M{sup 2} is the scaled momentum and varies from 0.0 to 1.0. The momentum spectrum is measured by considering the corrected yield for momentum bins above x{sub p} > 0.5 and can be parameterized very well by a Peterson function, given by: dN/dx{sub p} {proportional_to} 1/x{sub p}(1 - 1/x{sub p} - {epsilon}/1-x{sub p}){sup 2}. The values for the peterson parameter {epsilon}, are found to be 0.050 {+-} 0.010 for {Sigma}{sub c}{sup 0}(2800) and 0.057 {+-} 0.012 for {Sigma}{sub c}{sup ++}(2800). They use …
Date:
February 29, 2008
Creator:
Ahmded, Shamona
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Nuclear Energy Research Initiative Project No. 02 103 Innovative Low Cost Approaches to Automating QA/QC of Fuel Particle Production Using On Line Nondestructive Methods for Higher Reliability Final Project Report
This Nuclear Energy Research Initiative (NERI) project was tasked with exploring, adapting, developing and demonstrating innovative nondestructive test methods to automate nuclear coated particle fuel inspection so as to provide the United States (US) with necessary improved and economical Quality Assurance and Control (QA/QC) that is needed for the fuels for several reactor concepts being proposed for both near term deployment [DOE NE & NERAC, 2001] and Generation IV nuclear systems. Replacing present day QA/QC methods, done manually and in many cases destructively, with higher speed automated nondestructive methods will make fuel production for advanced reactors economically feasible. For successful deployment of next generation reactors that employ particle fuels, or fuels in the form of pebbles based on particles, extremely large numbers of fuel particles will require inspection at throughput rates that do not significantly impact the proposed manufacturing processes. The focus of the project is nondestructive examination (NDE) technologies that can be automated for production speeds and make either: (I) On Process Measurements or (II) In Line Measurements. The inspection technologies selected will enable particle “quality” qualification as a particle or group of particles passes a sensor. A multiple attribute dependent signature will be measured and used for qualification …
Date:
February 28, 2006
Creator:
Ahmed, Salahuddin; Batishko, Charles R.; Flake, Matthew; Good, Morris S.; Mathews, Royce; Morra, Marino et al.
Object Type:
Report
System:
The UNT Digital Library
Search for Axions with the CDMS Experiment
We report on the first axion search results from the Cryogenic Dark Matter Search (CDMS) experiment at the Soudan Underground Laboratory. An energy threshold of 2 keV for electron-recoil events allows a search for possible solar axion conversion into photons or local Galactic axion conversion into electrons in the germanium crystal detectors. The solar axion search sets an upper limit on the Primakov coupling g{sub a{gamma}{gamma}} of 2.4 x 10{sup ?9} GeV{sup -1} at the 95% confidence level for an axion mass less than 0.1 keV/c{sup 2}. This limit benefits from the first precise measurement of the absolute crystal plane orientations in this type of experiment. The Galactic axion search analysis sets a world-leading experimental upper limit on the axio-electric coupling g{sub a{bar e}e} of 1.4 x 10{sup -12} at the 90% confidence level for an axion mass of 2.5 keV/c{sup 2}. This analysis excludes an interpretation of the DAMA annual modulation result in terms of Galactic axion interactions for axion masses above 1.4 keV/c{sup 2}.
Date:
February 1, 2009
Creator:
Ahmed, Z.; Akerib, D. S.; Arrenberg, S.; Bailey, C. N.; Balakishiyeva, D.; Baudis, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Overcoming Scalability Challenges for Tool Daemon Launching
Many tools that target parallel and distributed environments must co-locate a set of daemons with the distributed processes of the target application. However, efficient and portable deployment of these daemons on large scale systems is an unsolved problem. We overcome this gap with LaunchMON, a scalable, robust, portable, secure, and general purpose infrastructure for launching tool daemons. Its API allows tool builders to identify all processes of a target job, launch daemons on the relevant nodes and control daemon interaction. Our results show that Launch-MON scales to very large daemon counts and substantially enhances performance over existing ad hoc mechanisms.
Date:
February 15, 2008
Creator:
Ahn, D H; Arnold, D C; de Supinski, B R; Lee, G L; Miller, B P & Schulz, M
Object Type:
Article
System:
The UNT Digital Library
Industrial Complex for Solid Radwaste Management at Chernobyle Nuclear Power Plant
In the framework of the preparation for the decommissioning of the Chernobyl Nuclear Power Plant (ChNPP) an Industrial Complex for Solid Radwaste Management (ICSRM) will be built under the EC TACIS Program in the vicinity of ChNPP. The paper will present the proposed concepts and their integration into existing buildings and installations. Further, the paper will consider the safety cases, as well as the integration of Western and Ukrainian Organizations into a cohesive project team and the requirement to guarantee the fulfillment of both Western standards and Ukrainian regulations and licensing requirements. The paper will provide information on the status of the interim design and the effects of value engineering on the output of basic design phase. The paper therefor summarizes the design results of the involved design engineers of the Design and Process Providers BNFL (LOT 1), RWE NUKEM GmbH (LOT 2 and General) and INITEC (LOT 3).
Date:
February 26, 2002
Creator:
Ahner, S. & Fomin, V. V.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Chester Ahr, February 18, 2005
The National Museum of the Pacific War presents an oral interview with Chester Ahr. Ahr joined the Marine Corps in December, 1941. He trained in San Diego and shipped overseas in October, 1942 to Guadalcanal where he was attached to a base services unit, which assisted the Seabees and Army engineers in construction projects. He also was in the invasion of Guam, where he was wounded and evacuated. Once he returned to his unit, Ahr got very sick and missed the invasion of Iwo Jima. Shortly afterwards, he was discharged.
Date:
February 18, 2005
Creator:
Ahr, Chester
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Chester Ahr, February 18, 2005
The National Museum of the Pacific War presents an oral interview with Chester Ahr. Ahr joined the Marine Corps in December, 1941. He trained in San Diego and shipped overseas in October, 1942 to Guadalcanal where he was attached to a base services unit, which assisted the Seabees and Army engineers in construction projects. He also was in the invasion of Guam, where he was wounded and evacuated. Once he returned to his unit, Ahr got very sick and missed the invasion of Iwo Jima. Shortly afterwards, he was discharged.
Date:
February 18, 2005
Creator:
Ahr, Chester
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with James Ahr, February 18, 2005
The National Museum of the Pacific War presents an interview with James Ahr. Ahr joined the Marine Corps at 16 years old in November, 1942. He lied about his age. After training, he went overseas and was assigned to the 9th Marine Regiment. He arrived in time for the invasion of Guam. Ahr also was at Iwo Jima and shares several impressions and anecdotes of the battle.
Date:
February 18, 2005
Creator:
Ahr, James P.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with James Ahr, February 18, 2005
The National Museum of the Pacific War presents an interview with James Ahr. Ahr joined the Marine Corps at 16 years old in November, 1942. He lied about his age. After training, he went overseas and was assigned to the 9th Marine Regiment. He arrived in time for the invasion of Guam. Ahr also was at Iwo Jima and shares several impressions and anecdotes of the battle.
Date:
February 18, 2005
Creator:
Ahr, James P.
Object Type:
Text
System:
The Portal to Texas History
Relationship of Recombination Lifetime and Dark Current In Silicon p-n Junctions
Measurement of recombination and minority-carrier lifetimes has become a central activity in photovoltaic technology. The primary measurement techniques for silicon technologies are based on photoconductive decay (PCD) and microwave reflectance (mPCD). The measurement of the correct recombination lifetime depends on the carriers being confined to a given spatial region of a diagnostic structure. The internal electric fields separate the charges, and the measured value does not represent the real minority-carrier lifetime. In these cases, the measured quantity is a function of the true lifetime and the sample structure. Here, we examine these effects, both experimentally and theoretically, for the n+-p device structure common to terrestrial photovoltaics.
Date:
February 1, 2005
Creator:
Ahrenkiel, R. K.; Metzger, W. K.; Page, M.; Reedy, R.; Luther, J. & Dashdorj, J.
Object Type:
Article
System:
The UNT Digital Library