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2,780 Matching Results
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Advanced Power Electronic Interfaces for Distributed Energy Systems Part 1: Systems and Topologies
This report summarizes power electronic interfaces for DE applications and the topologies needed for advanced power electronic interfaces. It focuses on photovoltaic, wind, microturbine, fuel cell, internal combustion engine, battery storage, and flywheel storage systems.
Date:
March 1, 2008
Creator:
Kramer, W.; Chakraborty, S.; Kroposki, B. & Thomas, H.
Object Type:
Report
System:
The UNT Digital Library
Advanced Power Electronic Interfaces for Distributed Energy Systems, Part 2: Modeling, Development, and Experimental Evaluation of Advanced Control Functions for Single-Phase Utility-Connected Inverter
Integrating renewable energy and distributed generations into the Smart Grid architecture requires power electronic (PE) for energy conversion. The key to reaching successful Smart Grid implementation is to develop interoperable, intelligent, and advanced PE technology that improves and accelerates the use of distributed energy resource systems. This report describes the simulation, design, and testing of a single-phase DC-to-AC inverter developed to operate in both islanded and utility-connected mode. It provides results on both the simulations and the experiments conducted, demonstrating the ability of the inverter to provide advanced control functions such as power flow and VAR/voltage regulation. This report also analyzes two different techniques used for digital signal processor (DSP) code generation. Initially, the DSP code was written in C programming language using Texas Instrument's Code Composer Studio. In a later stage of the research, the Simulink DSP toolbox was used to self-generate code for the DSP. The successful tests using Simulink self-generated DSP codes show promise for fast prototyping of PE controls.
Date:
November 1, 2008
Creator:
Chakraborty, S.; Kroposki, B. & Kramer, W.
Object Type:
Report
System:
The UNT Digital Library
Advanced Test Reactor - A National Scientific User Facility
The ATR is a pressurized, light-water moderated and cooled, beryllium-reflected nuclear research reactor with a maximum operating power of 250 MWth. The unique serpentine configuration of the fuel elements creates five main reactor power lobes (regions) and nine flux traps. In addition to these nine flux traps there are 68 additional irradiation positions in the reactor core reflector tank. There are also 34 low-flux irradiation positions in the irradiation tanks outside the core reflector tank. The ATR is designed to provide a test environment for the evaluation of the effects of intense radiation (neutron and gamma). Due to the unique serpentine core design each of the five lobes can be operated at different powers and controlled independently. Options exist for the individual test trains and assemblies to be either cooled by the ATR coolant (i.e., exposed to ATR coolant flow rates, pressures, temperatures, and neutron flux) or to be installed in their own independent test loops where such parameters as temperature, pressure, flow rate, neutron flux, and energy can be controlled per experimenter specifications. The full-power maximum thermal neutron flux is ~1.0 x1015 n/cm2-sec with a maximum fast flux of ~5.0 x1014 n/cm2-sec. The Advanced Test Reactor, now a National …
Date:
May 1, 2008
Creator:
Stanley, Clifford J.
Object Type:
Article
System:
The UNT Digital Library
Advanced Test Reactor In-Canal Ultrasonic Scanner: Experiment Design and Initial Results on Irradiated Plates
An irradiation test device has been developed to support testing of prototypic scale plate type fuels in the Advanced Test Reactor. The experiment hardware and operating conditions were optimized to provide the irradiation conditions necessary to conduct performance and qualification tests on research reactor type fuels for the RERTR program. The device was designed to allow disassembly and reassembly in the ATR spent fuel canal so that interim inspections could be performed on the fuel plates. An ultrasonic scanner was developed to perform dimensional and transmission inspections during these interim investigations. Example results from the AFIP-2 experiment are presented.
Date:
September 1, 2008
Creator:
Wachs, D. M.; Wight, J. M.; Clark, D. T.; Williams, J. M.; Taylor, S. C.; Utterbeck, D. J. et al.
Object Type:
Article
System:
The UNT Digital Library
The Advanced Test Reactor Irradiation Capabilities Available as a National Scientific User Facility
The Advanced Test Reactor (ATR) is one of the world’s premiere test reactors for performing long term, high flux, and/or large volume irradiation test programs. The ATR is a very versatile facility with a wide variety of experimental test capabilities for providing the environment needed in an irradiation experiment. These capabilities include simple capsule experiments, instrumented and/or temperature-controlled experiments, and pressurized water loop experiment facilities. Monitoring systems have also been utilized to monitor different parameters such as fission gases for fuel experiments, to measure specimen performance during irradiation. ATR’s control system provides a stable axial flux profile throughout each reactor operating cycle, and allows the thermal and fast neutron fluxes to be controlled separately in different sections of the core. The ATR irradiation positions vary in diameter from 16 mm to 127 mm over an active core height of 1.2 m. This paper discusses the different irradiation capabilities with examples of different experiments and the cost/benefit issues related to each capability. The recent designation of ATR as a national scientific user facility will make the ATR much more accessible at very low to no cost for research by universities and possibly commercial entities.
Date:
September 1, 2008
Creator:
Grover, S. Blaine
Object Type:
Article
System:
The UNT Digital Library
Advanced Test Reactor -- Testing Capabilities and Plans AND Advanced Test Reactor National Scientific User Facility -- Partnerships and Networks
The Advanced Test Reactor (ATR), at the Idaho National Laboratory (INL), is one of the world’s premier test reactors for providing the capability for studying the effects of intense neutron and gamma radiation on reactor materials and fuels. The physical configuration of the ATR, a 4-leaf clover shape, allows the reactor to be operated at different power levels in the corner “lobes” to allow for different testing conditions for multiple simultaneous experiments. The combination of high flux (maximum thermal neutron fluxes of 1E15 neutrons per square centimeter per second and maximum fast [E>1.0 MeV] neutron fluxes of 5E14 neutrons per square centimeter per second) and large test volumes (up to 122 cm long and 12.7 cm diameter) provide unique testing opportunities. For future research, some ATR modifications and enhancements are currently planned. In 2007 the US Department of Energy designated the ATR as a National Scientific User Facility (NSUF) to facilitate greater access to the ATR for material testing research by a broader user community. This paper provides more details on some of the ATR capabilities, key design features, experiments, and plans for the NSUF.
Date:
July 1, 2008
Creator:
Marshall, Frances M.
Object Type:
Article
System:
The UNT Digital Library
Advanced Thermal Control Enabling Cost Reduction for Automotive Power Electronics
Describes NREL's work on next-generation vehicle cooling technologies (jets, sprays, microchannels) and novel packaging topologies to reduce costs and increase performance and reliability.
Date:
September 1, 2008
Creator:
Abraham, T.; Kelly, K.; Bennion, K. & Vlahinos, A.
Object Type:
Presentation
System:
The UNT Digital Library
Advanced Variance Reduction for Global k-Eigenvalue Simulations in MCNP
The "criticality" or k-eigenvalue of a nuclear system determines whether the system is critical (k=1), or the extent to which it is subcritical (k<1) or supercritical (k>1). Calculations of k are frequently performed at nuclear facilities to determine the criticality of nuclear reactor cores, spent nuclear fuel storage casks, and other fissile systems. These calculations can be expensive, and current Monte Carlo methods have certain well-known deficiencies. In this project, we have developed and tested a new "functional Monte Carlo" (FMC) method that overcomes several of these deficiencies. The current state-of-the-art Monte Carlo k-eigenvalue method estimates the fission source for a sequence of fission generations (cycles), during each of which M particles per cycle are processed. After a series of "inactive" cycles during which the fission source "converges," a series of "active" cycles are performed. For each active cycle, the eigenvalue and eigenfunction are estimated; after N >> 1 active cycles are performed, the results are averaged to obtain estimates of the eigenvalue and eigenfunction and their standard deviations. This method has several disadvantages: (i) the estimate of k depends on the number M of particles per cycle, (iii) for optically thick systems, the eigenfunction estimate may not converge due …
Date:
June 1, 2008
Creator:
Larsen, Edward W.
Object Type:
Report
System:
The UNT Digital Library
Advanced Vehicles Group: Center for Transportation Technologies and Systems
Describes R&D in advanced vehicle systems and components (e.g., batteries) by NREL's Advanced Vehicles Group.
Date:
August 1, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advancing the state of the art in materials accountancy through Safeguards Performance Modeling.
None
Date:
August 1, 2008
Creator:
Ricker, Neil Lawrence (University of Washington, Seattle, WA) & Cipiti, Benjamin B.
Object Type:
Report
System:
The UNT Digital Library
An Aerial Radiological Survey of Selected Areas of the City of North Las Vegas
As part of the proficiency training for the Radiological Mapping mission of the Aerial Measuring System (AMS), a survey team from the Remote Sensing Laboratory-Nellis (RSL-Nellis) conducted an aerial radiological survey of selected areas of the city of North Las Vegas for the purpose of mapping natural radiation background and locating any man-made radioactive sources. Survey areas were selected in collaboration with the City Manager's office and included four separate areas: (1) Las Vegas Motor Speedway (10.6 square miles); (2) North Las Vegas Downtown Area (9.2 square miles); (3) I-15 Industrial Corridor (7.4 square miles); and (4) Future site of University of Nevada Las Vegas campus (17.4 square miles). The survey was conducted in three phases: Phase 1 on December 11-12, 2007 (Areas 1 and 2), Phase 2 on February 28, 2008 (Area 3), and Phase 3 on March 19, 2008 (Area 4). The total completed survey covered a total of 44.6 square miles. The flight lines (without the turns) over the surveyed areas are presented in Figures 1, 2, 3, and 4. A total of eight 2.5-hour-long flights were performed at an altitude of 150 ft above ground level (AGL) with 300 feet of flight-line spacing. Water line and …
Date:
June 1, 2008
Creator:
Wasiolek, Piotr
Object Type:
Report
System:
The UNT Digital Library
AFC-1 Fuel Rodlet Fission Power Deposition Validation in ATR
One of the viable options of long-term geological disposal of the nuclear power reactors generated spent fuel is to extract plutonium, the minor actinides (MA) and potentially long-lived fission products from the spent fuel and transmute them into short-lived or stable radionuclides in an appropriate reactor for the reduction of the radiological toxicity of the nuclear waste stream. An important component of that technology will be a non-fertile / low-fertile actinide transmutation fuel form containing the plutonium, neptunium, americium (and possibly curium) isotopes to be transmuted. Such advanced fuel forms, especially ones enriched in the long-life minor actinide (LLMA) elements (i.e., Np, Am, Cm), have minimal irradiation performance data available from which to establish a transmutation fuel form design. Recognizing these needs, an Advanced Fuel Cycle test series-1 (AFC-1) irradiation test on a variety of candidate fuel forms is now being conducted in Advanced Test Reactor (ATR) at the Idaho National Laboratory (INL). The first advanced fuel experiment (AFC-1) has been finalized and the test assembly analyzed for insertion and irradiation in ATR. The ATR core consists of a serpentine and rotationally symmetric fuel assembly about the z-axis of the core center. The plan view of the ATR core configuration …
Date:
November 1, 2008
Creator:
Chang, G. S.; Lillo, M. A. & Utterbeck, D. J.
Object Type:
Article
System:
The UNT Digital Library
Agile machining and inspection thrust area team-on-machine probing / compatibility assessment of Parametric Technology Corporation (PTC) pro/CMM DMIS with Zeiss DMISEngine.
The charter goal of the Agile Machining and Inspection Thrust Area Team is to identify technical requirements, within the nuclear weapons complex (NWC), for Agile Machining and Inspection capabilities. During FY 2008, the team identified Parametric Technology Corporation (PTC) Pro/CMM as a software tool for use in off-line programming of probing routines--used for measurement--for machining and turning centers. The probing routine would be used for in-process verification of part geometry. The same Pro/CMM program used on the machine tool could also be employed for program validation / part verification using a coordinate measuring machine (CMM). Funding was provided to determine the compatibility of the Pro/CMM probing program with CMM software (Zeiss DMISEngine).
Date:
September 1, 2008
Creator:
Wade, James Rokwel; Tomlinson, Kurt & Bryce, Edwin Anthony
Object Type:
Report
System:
The UNT Digital Library
Agricultural Credit: Institutions and Issues
This report discusses federal credit assistance for farmers and recent issues in Congress related to the programs.
Date:
October 1, 2008
Creator:
Monke, Jim
Object Type:
Report
System:
The UNT Digital Library
Agricultural Research, Extension, and Education: Farm Bill Issues
This report discusses the farm bill (P.L. 110-234) that will authorize and direct the implementation of the U.S. Department of Agriculture's (USDA's) major programs across the spectrum of its mission areas through FY2012. The enacted bill reorganizes the Department's research, extension, and economics mission area, which currently comprises four agencies that separately administer intramural and extramural programs supporting agricultural research and development (R&D).
Date:
February 1, 2008
Creator:
Rawson, Jean M.
Object Type:
Report
System:
The UNT Digital Library
Agriculture and Related Agencies: FY2008 Appropriations
This report considers the Agriculture and Related Agencies appropriations bill. The report compares and contrasts the Senate and House versions of the bill in terms of budgeting. Both bills provide 7.5 billion dollars less than FY2007.
Date:
February 1, 2008
Creator:
Monke, Jim
Object Type:
Report
System:
The UNT Digital Library
Air, Thermal and Water Management for PEM Fuel Cell Systems
This report has a detailed study of the fuel cells.
Date:
October 1, 2008
Creator:
Mirza, Mark K. Gee Zia
Object Type:
Article
System:
The UNT Digital Library
Air, Thermal and Water Management for PEM Fuel Cell Systems
Document discussing the management of different properties of the PEM fuel cells.
Date:
October 1, 2008
Creator:
Liu, Mark K. Gee Chung
Object Type:
Article
System:
The UNT Digital Library
Air, Thermal, and Water Management for PEM Fuel Cell Systems
This report has the study of fuel cells and their parts.
Date:
October 1, 2008
Creator:
Pont, Mark K. Gee Guillermo
Object Type:
Article
System:
The UNT Digital Library
Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Third Evaluation Report and Appendices
This report describes operations at Alameda-Contra Costa Transit district for three protoype fuel cell buses and six diesel buses operating from the same location.
Date:
July 1, 2008
Creator:
Chandler, K. & Eudy, L.
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 132, No. 49, Ed. 1 Thursday, May 1, 2008
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
May 1, 2008
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
An Algebraic Approach to the Evolution of Emittances upon Crossing the Linear Coupling Difference Resonance
One of the hallmarks of linear coupling is the resonant exchange of oscillation amplitude between the horizontal and vertical planes when the difference between the unperturbed tunes is close to an integer. The standard derivation of this phenomenon (known as the difference resonance) can be found, for example, in the classic papers of Guignard [1, 2]. One starts with an uncoupled lattice and adds a linear perturbation that couples the two planes. The equations of motion are expressed in hamiltonian form. As the difference between the unperturbed tunes approaches an integer, one finds that the perturbing terms in the hamiltonian can be divided into terms that oscillate slowly and ones that oscillate rapidly. The rapidly oscillating terms are discarded or transformed to higher order with an appropriate canonical transformation. The resulting approximate hamiltonian gives equations of motion that clearly exhibit the exchange of oscillation amplitude between the two planes. If, instead of the hamiltonian, one is given the four-by-four matrix for one turn around a synchrotron, then one has the complete solution for the turn-by-turn (TBT) motion. However, the conditions for the phenomenon of amplitude exchange are not obvious from a casual inspection of the matrix. These conditions and those …
Date:
September 1, 2008
Creator:
Gardner,C.
Object Type:
Report
System:
The UNT Digital Library
An Algebraic Approach to the Evolution of Emittances upon Crossing the Linear Coupling Difference Resonance
N/A
Date:
September 1, 2008
Creator:
Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Alignment of the Near Detector scintillator modules using cosmic ray muons
The authors describe the procedures and the results of the first alignment of the Near Detector. Using 15.5 million cosmic ray muon tracks, collected from October, 2004 through early january, 2005, they derive the effective transverse positions of the calorimeter scintillator modules. The residuals from straight line fits indicate that the current alignment has achieved better than 1 mm precision. They estimate the size of the remaining misalignment and using tracks recorded with a magnetic field test the effect of the magnetic field on the alignment.
Date:
May 1, 2008
Creator:
Ospanov, Rustem; Lang, Karol & U., /Texas
Object Type:
Report
System:
The UNT Digital Library