Resource Type

Language

429 Matching Results

Results open in a new window/tab.

LSST data pipeline prototyping plans and strategy (open access)

LSST data pipeline prototyping plans and strategy

In this document we describe our approach and strategy for building the prototype for the image-stream analysis data pipeline. We start by describing the main research areas upon which we will be focusing; we then describe our plans on how to carry these research ideas to implement the data pipeline.
Date: May 27, 2004
Creator: Abdulla, G. M.; Brase, J.; Cook, K. & Miller, M.
System: The UNT Digital Library
Scientific Report (2002-2004) (open access)

Scientific Report (2002-2004)

OAK-B135 An overview of our work as well as two recent publications are contained in this scientific report. The work reported here revolves around the discovery of new coherent nonlinear kinetic waves in laser produced plasmas, we call KEEN waves (kinetic, electrostatic electron nonlinear waves), and optical mixing experiments on the Imega laser system at LLE with blue-green light for the exploration of ways to suppress parametric instabilities in long scale length, long pulsewidth laser-plasmas such as those which will be found on NIF or LMJ.
Date: May 11, 2004
Creator: Afeyan, Bedros
System: The UNT Digital Library
Development of a Novel Catalyst for NO Decomposition (open access)

Development of a Novel Catalyst for NO Decomposition

Air pollution arising from the emission of nitrogen oxides as a result of combustion taking place in boilers, furnaces and engines, has increasingly been recognized as a problem. New methods to remove NO{sub x} emissions significantly and economically must be developed. The current technology for post-combustion removal of NO is the selective catalytic reduction (SCR) of NO by ammonia or possibly by a hydrocarbon such as methane. The catalytic decomposition of NO to give N{sub 2} will be preferable to the SCR process because it will eliminate the costs and operating problems associated with the use of an external reducing species. The most promising decomposition catalysts are transition metal (especially copper)-exchanged zeolites, perovskites, and noble metals supported on metal oxides such as alumina, silica, and ceria. The main shortcoming of the noble metal reducible oxide (NMRO) catalysts is that they are prone to deactivation by oxygen. It has been reported that catalysts containing tin oxide show oxygen adsorption behavior that may involve hydroxyl groups attached to the tin oxide. This is different than that observed with other noble metal-metal oxide combinations, which have the oxygen adsorbing on the noble metal and subsequently spilling over to the metal oxide. This observation …
Date: May 1, 2004
Creator: Akyurtlu, Ates & Akyurtlu, Jale F.
System: The UNT Digital Library
Radiation dose measurements of the insertion devices using radiachromic film dosimeters. (open access)

Radiation dose measurements of the insertion devices using radiachromic film dosimeters.

The Advanced Photon Source (APS) uses Nd-Fe-B permanent magnets in the insertion devices to produce x-rays for scientific research [1,2]. Earlier investigations have exhibited varying degrees of demagnetization of these magnets [3] due to irradiation from electron beams [4,5,6], {sup 60}Co {gamma}-rays [5], and high-energy neutrons [7,8]. Radiation-induced demagnetization has been observed in the APS insertion devices [9] and was first measured in December of 2001. Partial demagnetization has also been observed in insertion devices at the European Synchrotron Radiation Facility (ESRF) [4,6], where Nd-Fe-B permanent magnets are also used. Growing concern for the lifetime of APS insertion devices, as well as the permanent magnets that will be used in next-generation, high-power light sources, like the FEL [10,11], resulted from the partial demagnetization observations made at both facilities. This concern in relation to radiation-induced demagnetization spurred a long-term project to measure and analyze the absorbed doses received by the APS insertion devices. The project required a reliable photon high-dose dosimetry technique capable of measuring absorbed doses greater than 10{sup 6} rad, which was not readily available at the APS. Through a collaboration with the National Institute of Standards and Technology (NIST), one such technique using radiachromic films was considered, tested, …
Date: May 25, 2004
Creator: Alderman, J.; Semones, E. & Job, P. K.
System: The UNT Digital Library
Smart Screening System (S3) In Taconite Processing (open access)

Smart Screening System (S3) In Taconite Processing

The conventional vibrating machines used in processing plants have had undesirable high noise and vibration levels. They also have had unsatisfactorily low screening efficiency, high energy consumption, high maintenance cost, low productivity, and poor worker safety. These conventional vibrating machines have been used in most every processing plant. Most of the current material separation technology uses heavy and inefficient electric motors with an unbalance rotating mass to generate the shaking. In addition to being excessively noisy, inefficient, and high-maintenance, these vibrating machines are often the bottleneck in the entire process. Furthermore, these motors, along with the vibrating machines and supporting structure, shake other machines and structures in the vicinity. The latter increases maintenance costs while reducing worker health and safety. The conventional vibrating fine screens at taconite processing plants have had the same problems as those listed above. This has resulted in lower screening efficiency, higher energy and maintenance cost, and lower productivity and workers safety concerns. The focus of this work is on the design of a high performance screening machine suitable for taconite processing plants. SmartScreens{trademark} technology uses miniaturized motors, based on smart materials, to generate the shaking. The underlying technologies are Energy Flow Control{trademark} and Vibration Control …
Date: May 1, 2004
Creator: Allaei, Daryoush; Mohammed, Asim Syed & Tarnowski, David
System: The UNT Digital Library
Vestibule and Cask Preparation Mechanical Handling Calculation (open access)

Vestibule and Cask Preparation Mechanical Handling Calculation

The scope of this document is to develop the size, operational envelopes, and major requirements of the equipment to be used in the vestibule, cask preparation area, and the crane maintenance area of the Fuel Handling Facility. This calculation is intended to support the License Application (LA) submittal of December 2004, in accordance with the directive given by DOE correspondence received on the 27th of January 2004 entitled: ''Authorization for Bechtel SAIC Company L.L.C. to Include a Bare Fuel Handling Facility and Increased Aging Capacity in the License Application, Contract Number DE-AC28-01R W12101'' (Ref. 167124). This correspondence was appended by further correspondence received on the 19th of February 2004 entitled: ''Technical Direction to Bechtel SAIC Company L.L. C. for Surface Facility Improvements, Contract Number DE-AC28-01R W12101; TDL No. 04-024'' (Ref. 16875 1). These documents give the authorization for a Fuel Handling Facility to be included in the baseline. The limitations of this preliminary calculation lie within the assumptions of section 5 , as this calculation is part of an evolutionary design process.
Date: May 26, 2004
Creator: Ambre, N.
System: The UNT Digital Library
New Heterogeneous Catalysts for the Selective Reduction of NOx under Lean Conditions. Final Report (open access)

New Heterogeneous Catalysts for the Selective Reduction of NOx under Lean Conditions. Final Report

The original goal of this program was the identification and design of new noble-metal-based catalysts for the selective catalytic reduction of nitric oxide by hydrocarbons under excess oxygen (i.e., ''lean'') conditions (HC-SCR). Work conducted in the first funding cycle of this award (i.e., 1997-2000) was successful in allowing us to develop an understanding of the fundamental surface chemistry taking place during the adsorption and reaction of nitrogen oxides and propylene on the surface of supported noble metal catalysts. Both experimental results collected in our own group as well as molecular simulation results published by Professor Neurock suggested that in order to improve the performance of the Pt catalysts--in terms of the nitrogen selectivity and the temperature window of operation-- it was necessary to introduce a second metal. However, synthesizing such catalysts with the metals of interest (i.e., Pt-Au, Pt-Ru, Pt-Rh, etc.) with some degree of control of the structure and composition of the resulting supported metal particles is in itself a research challenge. Consequently, the bulk of our efforts during the second funding cycle of this award (covered by this report) was shifted to the use of organometallic cluster precursors for the synthesis on novel bimetallic catalysts. During this time …
Date: May 31, 2004
Creator: Amiridis, M. D.
System: The UNT Digital Library
Effects of Radiative Recombination and Photon Recycling on Minority Carrier Lifetime in Epitaxial GaINAsSb Lattice-matched to GaSb (open access)

Effects of Radiative Recombination and Photon Recycling on Minority Carrier Lifetime in Epitaxial GaINAsSb Lattice-matched to GaSb

None
Date: May 11, 2004
Creator: Anikeev, S.; Donetsky, D.; Belenky, G.; Luryl, S.; Wang, C. A.; Shiau, D. A. et al.
System: The UNT Digital Library
The Individuals with Disabilities Education Act (IDEA): Selected Changes that Would be Made to the Law by S. 1248, 108th Congress (open access)

The Individuals with Disabilities Education Act (IDEA): Selected Changes that Would be Made to the Law by S. 1248, 108th Congress

CRS Report for Congress entailing information about changes being made to the law because of the Individuals with Disabilities Act (IDEA). Topics include, eligibility by jurisdiction, safeguarding, evaluation and Individualized Education Programs (IEPS), etc..
Date: May 7, 2004
Creator: Apling, Richard N. & Jones, Nancy Lee
System: The UNT Digital Library
Women in Iraq: Background and Issues for U.S. Policy (open access)

Women in Iraq: Background and Issues for U.S. Policy

The issue of women’s rights in Iraq has taken on new relevance, following the U.S.-led invasion of Iraq in 2003, efforts to reconstruct Iraq, and recent elections for a Transitional National Assembly (TNA). Over the past three years, the Bush Administration has reiterated its interest in ensuring that Iraqi women participate in politics and ongoing reconstruction efforts in Iraq. There has also been a widening debate regarding the extent to which the U.S.-led reconstruction efforts have been able to enhance women’s rights in Iraq and encourage their participation in Iraq’s governing institutions.
Date: May 5, 2004
Creator: Armanios, Febe
System: The UNT Digital Library
Research in Hydrogen Passivation of Defects and Impurities in Silicon: Final Subcontract Report, 2 May 2000--2 July 2003 (open access)

Research in Hydrogen Passivation of Defects and Impurities in Silicon: Final Subcontract Report, 2 May 2000--2 July 2003

Our work consists of hydrogenating silicon (Si) samples by different methods such as low-energy implantation, electron cyclotron resonance (ECR) plasma, and thermal diffusion. The samples will be provided through NREL. The experimental work carried out at Penn State involves the study of hydrogen interaction with defects, trapping, migration, and formation of complexes. The principal vehicle for the latter study will be ion implantation, and the intent is to understand mechanisms of defect passivation and activation by hydrogen. The theoretical studies will consist of the calculation of the structure and parameters related to hydrogen diffusion and interactions of hydrogen with transition metal impurities in silicon. Experimental studies will involve measurements of hydrogen and hydrogen-impurity complexes, and diffusion properties of various species of hydrogen in Si. The experimental work at Penn State includes introduction of hydrogen in a variety of photovoltaic Si by ECR plasma, low-energy ion implantation, and thermal diffusion. The specific tasks will be the evaluation of hydrogen interaction with defects engineered by ion implantation; defect passivation, activation, and migration in hydrogenated Si under thermal anneal; and electrical activity of hydrogen-impurity complexes. Electrical characterization will entail I-V and C-V measurements, spreading resistance, and deep-level transient spectroscopy.
Date: May 1, 2004
Creator: Ashok, S.
System: The UNT Digital Library
Impact of Uranium Levels ON Sludge Batch 2 Simulant Processing (open access)

Impact of Uranium Levels ON Sludge Batch 2 Simulant Processing

The Defense Waste Processing Facility began processing Sludge Batch 2 (SB2) in December of 2001. Since the introduction of the first SRAT batch of SB2, processing issues have been observed in the Sludge Receipt and Adjustment Tank, Slurry Mix Evaporator Melter Feed Tank and the melter. These issues coincided with the start of Batch 209, the first full batch from SB2a5. The issues involved the ability to transfer process slurries and feed the melter, difficulty maintaining heat transfer in the SME, and degradation of the operation of the melter. One of the primary differences between Sludge Batch 2 and the previous Sludge Batches is the increased content of uranium. The Savannah River National Laboratory was requested by DWPF via Technical Task Request HLW/DWPF TTR-02-0035 to determine if the processing issues are related to the elevated levels of uranium in SB21. The work reported here is intended to address only a portion of TTR-0035, specifically the impact of uranium on Sludge Batch 2. This work is governed by a Task Technical and Quality Assurance Plan 2 and an Analytical Study Plan 3. SRNL conducted small-scale tests designed to determine the effect of different levels of uranium on sludge processing at the …
Date: May 1, 2004
Creator: BANNOCHIE, CHRISTOPHERJ.
System: The UNT Digital Library
High Level Waste Lag Storage and Feed Blending (open access)

High Level Waste Lag Storage and Feed Blending

SRTC performed small-scale tests to determine the behavior associated with blending streams in the High-level Waste (HLW) Lag Storage and Feed Blending Process System for the Hanford Waste Treatment and Immobilization Plant (WTP). The work reported here was planned and designed in response to the test specification. The Office of River Protection Hanford Waste Treatment and Immobilization Plant consists of three primary facilities: a Pretreatment Facility and two facilities for low-activity and high-level waste vitrification. The Pretreatment Facility contains unit operations which receive waste feed from the Hanford Tank Farms and separate it into two treated waste streams: a low-activity, liquid waste stream stripped of most solids and radioisotopes (processed through the Low-Activity Waste Vitrification Facility) and a high-level waste slurry containing most of the solids and radioisotopes (processed through the High-Level Waste Vitrification Facility). Blending of the later solids a nd radioisotopes streams and their resulting properties is the subject of this report. These mixtures are shown to be unreactive and pumpable by using statistically designed combinations of nonradioactive simulants for the process streams. Properties of the mixtures are also predicted numerically (with the Environmental Simulation Program) and compared with the experimental results. The results did not reveal any …
Date: May 10, 2004
Creator: BARNES, M.J.
System: The UNT Digital Library
Gas Turbine Reheat Using in Situ Combustion: Final Report, Draft (open access)

Gas Turbine Reheat Using in Situ Combustion: Final Report, Draft

In situ reheat is an alternative to traditional gas turbine reheat design in which fuel is fed through airfoils rather than in a bulky discrete combustor separating HP and LP turbines. The goals are to achieve increased power output and/or efficiency without higher emissions. In this program the scientific basis for achieving burnout with low emissions has been explored. In Task 1, Blade Path Aerodynamics, design options were evaluated using CFD in terms of burnout, increase of power output, and possible hot streaking. It was concluded that Vane 1 injection in a conventional 4-stage turbine was preferred. Vane 2 injection after vane 1 injection was possible, but of marginal benefit. In Task 2, Combustion and Emissions, detailed chemical kinetics modeling, validated by Task 3, Sub-Scale Testing, experiments, resulted in the same conclusions, with the added conclusion that some increase in emissions was expected. In Task 4, Conceptual Design and Development Plan, Siemens Westinghouse power cycle analysis software was used to evaluate alternative in situ reheat design options. Only single stage reheat, via vane 1, was found to have merit, consistent with prior Tasks. Unifying the results of all the tasks, a conceptual design for single stage reheat utilizing 24 holes, …
Date: May 17, 2004
Creator: Bachovchin, D. M.; Lippert, T. E.; Newby, R. A. & Cizmas, P. G. A.
System: The UNT Digital Library
Estimation of Particle Flux and Remineralization Rate from Radioactive Disequilibrium (open access)

Estimation of Particle Flux and Remineralization Rate from Radioactive Disequilibrium

Reactive radionuclides, such as the thorium isotopes, show measurable deficiencies in the oceanic water column because of their removal by chemical scavenging due to the particle flux. Measurement of the deficiency, coupled with measurement of the radionuclide concentration in particles, allows a determination of the effective particle sinking velocity. Results to date suggest that the effective particle sinking velocity is remarkably invariant with depth. This leads to the tentative suggestion that POC concentration profiles may, to a good approximation, be used directly to determine length scales for the remineralization of sinking organic matter. Further measurements are in progress to test this idea and to evaluate its limitations. Knowledge of the remineralization length scale is essential to an evaluation of the efficiency of the biological pump as a means for deep sequestering of carbon in the ocean.
Date: May 24, 2004
Creator: Bacon, Michael P. & Francois, Roger
System: The UNT Digital Library
Oxygen Transport Ceramic Membranes (open access)

Oxygen Transport Ceramic Membranes

The present quarterly report describes some of the investigations on the structural properties of dense OTM bars provided by Praxair and studies on newer composition of Ti doped LSF. In this report, in situ neutron diffraction was used to characterize the chemical and structural properties of La{sub 0.2}Sr{sub 0.8}Fe{sub 0.55}Ti{sub 0.45}O{sub 3-{delta}} (here after as L2SF55T) specimen, which was subject to measurements of neutron diffraction from room temperature to 900 C in N{sub 2}. Space group of R3c was found to result in a better refinement and is used in this study. The difference for crystal structure, lattice parameters and local crystal chemistry for LSFT nearly unchanged when gas environment switched from air to N{sub 2}. Stable crack growth studies on Dense OTM bars provided by Praxair were done at room temperature in air. A bridge-compression fixture was fabricated to achieve stable pre-cracks from Vickers indents. Post fracture evaluation indicated stable crack growth from the indent and a regime of fast fracture. Post-fracture X-ray data of the OTM fractured at 1000 C in environment were refined by FullProf code and results indicate a distortion of the parent cubic perovskite to orthorhombic structure with reduced symmetry. TGA-DTA studies on the post-fracture …
Date: May 1, 2004
Creator: Bandopadhyay, S.; Nagabhushana, N.; Zhou, X. -D.; Cai, Q.; Yang, J.; Yelon, W. B. et al.
System: The UNT Digital Library
Oxygen Transport Ceramic Membranes (open access)

Oxygen Transport Ceramic Membranes

The present quarterly report describes some of the investigations on the structural properties of dense OTM bars provided by Praxair and studies on newer composition of Ti doped LSF. In this report, in situ neutron diffraction was used to characterize the chemical and structural properties of La{sub 0.2}Sr{sub 0.8}Fe{sub 0.55}Ti{sub 0.45}O{sub 3-{delta}} (here after as L2SF55T) specimen, which was subject to measurements of neutron diffraction from room temperature to 900 C. It was found that space group of R3c yielded a better refinement than a cubic structure of Pm3m. Oxygen occupancy was nearly 3 in the region from room temperature to 700 C, above which the occupancy decreased due to oxygen loss. Dense OTM bars provided by Praxair were loaded to fracture at varying stress rates. Studies were done at room temperature in air and at 1000 C in a specified environment to evaluate slow crack growth behavior. The X-Ray data and fracture mechanisms points to non-equilibrium decomposition of the LSFCO OTM membrane. The non-equilibrium conditions could probably be due to the nature of the applied stress field (stressing rates) and leads to transition in crystal structures and increased kinetics of decomposition. The formations of a Brownmillerite or Sr2Fe2O5 type …
Date: May 1, 2004
Creator: Bandopadhyay, S.; Nagabhushana, N.; Zhou, X. -D.; Cai, Q.; Yang, J.; Yelon, W. B. et al.
System: The UNT Digital Library
Sludge Batch 2/3 Blend SRAT Cycle in the SRNL Shielded Cells (open access)

Sludge Batch 2/3 Blend SRAT Cycle in the SRNL Shielded Cells

The work conducted for this report was done to determine whether any processing problems could be anticipated with the blended material from Tank 40 and 51. The purpose of this report is to document the results of a SB2/3 blend Sludge Receipt Adjustment Tank (SRAT) cycle performed at the Savannah River National Laboratory (SRNL) Shielded Cells Facility (SCF). The following conclusions are drawn from this work: the SB2/3 blend supernate has a surface tension significantly higher than SB2 simulants and close to that of water; SB2/3 blend rheology is slightly more viscous and visually more cohesive than a SB3 sample alone; SRAT cycle processing of a SB2/3 blend was accomplished with no significant issues. Nitrite was destroyed at 140 per cent of acid stoichiometry. Hydrogen generation was well within DWPF limits. Nitrous oxide generation was well within DWPF limits. Considerable soluble uranium was measured in the SRAT product, likely as a result of the final pH of the SRAT product. SB2/3 blend SRAT product is less viscous than the starting feed with both the consistency and yield stress below the recommended DWPF operating region. The demonstration of simulated DWPF SRAT cycle processing of a radioactive SB2/3 blend based upon the …
Date: May 1, 2004
Creator: Bannochie, Christopher J.
System: The UNT Digital Library
Sodium-bearing Waste Treatment Technology Evaluation Report (open access)

Sodium-bearing Waste Treatment Technology Evaluation Report

Sodium-bearing waste (SBW) disposition is one of the U.S. Department of Energy (DOE) Idaho Operation Office’s (NE-ID) and State of Idaho’s top priorities at the Idaho National Engineering and Environmental Laboratory (INEEL). The INEEL has been working over the past several years to identify a treatment technology that meets NE-ID and regulatory treatment requirements, including consideration of stakeholder input. Many studies, including the High-Level Waste and Facilities Disposition Environmental Impact Statement (EIS), have resulted in the identification of five treatment alternatives that form a short list of perhaps the most appropriate technologies for the DOE to select from. The alternatives are (a) calcination with maximum achievable control technology (MACT) upgrade, (b) steam reforming, (c) cesium ion exchange (CsIX) with immobilization, (d) direct evaporation, and (e) vitrification. Each alternative has undergone some degree of applied technical development and preliminary process design over the past four years. This report presents a summary of the applied technology and process design activities performed through February 2004. The SBW issue and the five alternatives are described in Sections 2 and 3, respectively. Details of preliminary process design activities for three of the alternatives (steam reforming, CsIX, and direct evaporation) are presented in three appendices. A …
Date: May 1, 2004
Creator: Barnes, Charles M.; Olson, Arlin L. & Taylor, Dean D.
System: The UNT Digital Library
Final Progress Report: Direct Experiments on the Ocean Disposal of Fossil Fuel CO2. (open access)

Final Progress Report: Direct Experiments on the Ocean Disposal of Fossil Fuel CO2.

OAK-B135 This report summarizes activities and results of investigations of the potential environmental consequences of direct injection of carbon dioxide into the deep-sea as a carbon sequestration method. Results of field experiments using small scale in situ releases of liquid CO2 are described in detail. The major conclusions of these experiments are that mortality rates of deep sea biota will vary depending on the concentrations of CO2 in deep ocean waters that result from a carbon sequestration project. Large changes in seawater acidity and carbon dioxide content near CO2 release sites will likely cause significant harm to deep-sea marine life. Smaller changes in seawater chemistry at greater distances from release sites will be less harmful, but may result in significant ecosystem changes.
Date: May 25, 2004
Creator: Barry, James P. & Brewer, Peter G.
System: The UNT Digital Library
Boron Neutron Capture Therapy of Brain Tumors: Targeting Strategies and Therapeutic Models. Final Progress Report for February 1, 2003 - July 31, 2003 (open access)

Boron Neutron Capture Therapy of Brain Tumors: Targeting Strategies and Therapeutic Models. Final Progress Report for February 1, 2003 - July 31, 2003

The overall goal of this project was to evaluate either boronated EGF or anti-EGFR monoclonal antibodies (MoAbs) as delivery agents for boron neutron capture therapy (BNCT).
Date: May 21, 2004
Creator: Barth, R. F.
System: The UNT Digital Library
Heat Pump Water Heater Durabliltiy Testing - Phase II (open access)

Heat Pump Water Heater Durabliltiy Testing - Phase II

Ten heat pump water heaters (HPWH) were placed in an environmentally controlled test facility and run through a durability test program of approximately 7300 duty cycles (actual cycles accumulated ranged from 6640 to 8324 for the ten units). Five of the units were upgraded integral types (HPWH mounted on storage tank, no pump) from the same manufacturer as those tested in our first durability program in 2001 (Baxter and Linkous, 2002). The other five were ''add-on'' type units (HPWH with circulation pump plumbed to a separate storage tank) from another manufacturer. This durability test was designed to represent approximately 7-10 years of normal operation to meet the hot water needs of a residence. The integral units operated without incident apart from two control board failures. Both of these were caused by inadvertent exposure to very hot and humid (>135 F dry bulb and >120 F dew point) conditions that occurred due to a test loop failure. It is not likely that any residential water heater would be installed where such conditions were expected so these failures are not considered a long-term reliability concern. Two of the integral HPWHs featured a condensate management system (CMS) option that effectively eliminated any need …
Date: May 29, 2004
Creator: Baxter, VAND.
System: The UNT Digital Library
Tennessee Emergency Management and Homeland Security Statutory Authorities Summarized (open access)

Tennessee Emergency Management and Homeland Security Statutory Authorities Summarized

This report is one of a series that profiles the emergency management and homeland security statutory authorities of the 50 states, the District of Columbia, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, and three territories (American Samoa, Guam, and the U.S. Virgin Islands). Each profile identifies the more significant elements of state statutes, generally as codified. This report focuses on the state of Tennessee.
Date: May 27, 2004
Creator: Bea, Keith; Runyon, L. Cheryl & Warnock, Kae M.
System: The UNT Digital Library