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Physics design of a cold neutron source for KIPT neutron source facility. (open access)

Physics design of a cold neutron source for KIPT neutron source facility.

Argonne National Laboratory (ANL) of USA and Kharkov Institute of Physics and Technology (KIPT) of Ukraine have been collaborating on the conceptual design development of a neutron source facility. It is based on the use of an electron accelerator driven subcritical (ADS) facility with low enriched uranium fuel, using the existing electron accelerators at KIPT of Ukraine [1]. The neutron source of the subcritical assembly is generated from the interaction of 100-KW electron beam, which has a uniform spatial distribution and the electron energy in the range of 100 to 200 MeV, with a natural uranium target [2]. The main functions of the facility are the production of medical isotopes and the support of the Ukraine nuclear power industry. Neutron beam experiments and material studies are also included. Over the past two-three decades, structures with characteristic lengths of 100 {angstrom} and correspondingly smaller vibrational energies have become increasingly important for both science and technology [3]. The characteristic dimensions of the microstructures can be well matched by neutrons with longer vibrational wavelength and lower energy. In the accelerator-driven subcritical facility, most of the neutrons are generated from fission reactions with energy in the MeV range. They are slowed down to the …
Date: February 17, 2009
Creator: Zhong, Z.; Gohar, Y. & Kellogg, R.
Object Type: Report
System: The UNT Digital Library
Well-to-wheels energy use and greenhouse gas emissions analysis of plug-in hybrid electric vehicles. (open access)

Well-to-wheels energy use and greenhouse gas emissions analysis of plug-in hybrid electric vehicles.

Researchers at Argonne National Laboratory expanded the Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREET) model and incorporated the fuel economy and electricity use of alternative fuel/vehicle systems simulated by the Powertrain System Analysis Toolkit (PSAT) to conduct a well-to-wheels (WTW) analysis of energy use and greenhouse gas (GHG) emissions of plug-in hybrid electric vehicles (PHEVs). The WTW results were separately calculated for the blended charge-depleting (CD) and charge-sustaining (CS) modes of PHEV operation and then combined by using a weighting factor that represented the CD vehicle-miles-traveled (VMT) share. As indicated by PSAT simulations of the CD operation, grid electricity accounted for a share of the vehicle's total energy use, ranging from 6% for a PHEV 10 to 24% for a PHEV 40, based on CD VMT shares of 23% and 63%, respectively. In addition to the PHEV's fuel economy and type of on-board fuel, the marginal electricity generation mix used to charge the vehicle impacted the WTW results, especially GHG emissions. Three North American Electric Reliability Corporation regions (4, 6, and 13) were selected for this analysis, because they encompassed large metropolitan areas (Illinois, New York, and California, respectively) and provided a significant variation of marginal generation …
Date: March 31, 2009
Creator: Elgowainy, A.; Burnham, A.; Wang, M.; Molburg, J.; Rousseau, A. & Systems, Energy
Object Type: Report
System: The UNT Digital Library
Surveillance of Site A and Plot M, Report for 2008. (open access)

Surveillance of Site A and Plot M, Report for 2008.

The results of the environmental surveillance program conducted at Site A/Plot M in the Palos Forest Preserve area for Calendar Year 2008 are presented. Based on the results of the 1976-1978 radiological characterization of the site, a determination was made that a surveillance program be established. The characterization study determined that very low levels of hydrogen-3 (as tritiated water) had migrated from the burial ground and were present in two nearby hand pumped picnic wells. The current surveillance program began in 1980 and consists of sample collection and analysis of surface and subsurface water. The results of the analyses are used to (1) monitor the migration pathway of hydrogen-3 contaminated water from the burial ground (Plot M) to the hand-pumped picnic wells, (2) establish if other buried radionuclides have migrated, and (3) monitor for the presence of radioactive materials in the environment of the area. Hydrogen-3 in the Red Gate Woods picnic wells was still detected this year, but the average and maximum concentrations were significantly less than found earlier. Hydrogen-3 continues to be detected in a number of wells, boreholes, dolomite holes, and a surface stream. Analyses since 1984 have indicated the presence of low levels of strontium-90 in …
Date: May 7, 2009
Creator: Golchert, N. W.
Object Type: Report
System: The UNT Digital Library
Weather forecast-based optimization of integrated energy systems. (open access)

Weather forecast-based optimization of integrated energy systems.

In this work, we establish an on-line optimization framework to exploit detailed weather forecast information in the operation of integrated energy systems, such as buildings and photovoltaic/wind hybrid systems. We first discuss how the use of traditional reactive operation strategies that neglect the future evolution of the ambient conditions can translate in high operating costs. To overcome this problem, we propose the use of a supervisory dynamic optimization strategy that can lead to more proactive and cost-effective operations. The strategy is based on the solution of a receding-horizon stochastic dynamic optimization problem. This permits the direct incorporation of economic objectives, statistical forecast information, and operational constraints. To obtain the weather forecast information, we employ a state-of-the-art forecasting model initialized with real meteorological data. The statistical ambient information is obtained from a set of realizations generated by the weather model executed in an operational setting. We present proof-of-concept simulation studies to demonstrate that the proposed framework can lead to significant savings (more than 18% reduction) in operating costs.
Date: March 1, 2009
Creator: Zavala, V. M.; Constantinescu, E. M.; Krause, T. & Anitescu, M.
Object Type: Report
System: The UNT Digital Library
Measurement of the Cross Section of Charmed Hadrons and the Nuclear Dependence Alpha (open access)

Measurement of the Cross Section of Charmed Hadrons and the Nuclear Dependence Alpha

With data from the SELEX experiment we study charm hadro-production. We report the differential production cross sections as function of the longitudinal and transverse momentum, as well as for two different target materials, of 14 charmed hadron and/or their decay modes. This is the most extensive study to date. SELEX is a fixed target experiment at Fermilab with high forward acceptance; it took data during 1996-1997 with 600 GeV/c {Sigma}{sup -} and {pi}{sup -}, and 540 GeV/c proton and {pi}{sup +} beams. It used 5 target foils (two copper and three diamond). We use the results to determine {alpha}, used in parametrizing the production cross section as {infinity} A{sup {alpha}}, where A is the mass number of the target nuclei. We found within our statistics that {alpha} is independent of the longitudinal momentum fraction x{sub F} in the interval 0.1 < x{sub F} < 1.0, with {alpha} = 0.778 {+-} 0.014. The average value of {alpha} for charm production by pion beams is {alpha}{sub meson} = 0.850 {+-} 0.028. This is somewhat larger than the corresponding average {alpha}{sub baryon} = 0.755 {+-} 0.016 for charm production by baryon beams ({Sigma}{sup -} and protons).
Date: December 1, 2009
Creator: Blanco-Covarrubias, E.Alejandro & U., /San Luis Potosi
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Optimal explicit strong-stability-preserving general linear methods : complete results. (open access)

Optimal explicit strong-stability-preserving general linear methods : complete results.

This paper constructs strong-stability-preserving general linear time-stepping methods that are well suited for hyperbolic PDEs discretized by the method of lines. These methods generalize both Runge-Kutta (RK) and linear multistep schemes. They have high stage orders and hence are less susceptible than RK methods to order reduction from source terms or nonhomogeneous boundary conditions. A global optimization strategy is used to find the most efficient schemes that have low storage requirements. Numerical results illustrate the theoretical findings.
Date: March 3, 2009
Creator: Constantinescu, E. M.; Sandu, A.; Science, Mathematics and Computer & Univ., Virginia Polytechnic Inst. and State
Object Type: Report
System: The UNT Digital Library
Optimization of electron-cyclotron-resonance charge-breeder ions : Final CRADA Report. (open access)

Optimization of electron-cyclotron-resonance charge-breeder ions : Final CRADA Report.

Measurements of 1+ beam properties and associated performance of ECR Charge Breeder source determined by total efficiency measurement and charge state distributions from the ECR Charge Breeder. These results were communicated to Far-Tech personnel who used them to benchmark the newly developed programs that model ion capture and charge breeding in the ECR Charge Breeder Source. Providing the basic data described above and in the discussion below to Far-Tech allowed them to improve and refine their calculational tools for ECR ion sources. These new tools will be offered for sale to industry and will also provide important guidance to other research labs developing Charge Breeding ion sources for radioactive beam physics research.
Date: October 9, 2009
Creator: Pardo, R.; Physics & Far-Tech, Inc.
Object Type: Report
System: The UNT Digital Library
YALINA Analytical Benchmark Analyses Using the Deterministic ERANOS Code System. (open access)

YALINA Analytical Benchmark Analyses Using the Deterministic ERANOS Code System.

The growing stockpile of nuclear waste constitutes a severe challenge for the mankind for more than hundred thousand years. To reduce the radiotoxicity of the nuclear waste, the Accelerator Driven System (ADS) has been proposed. One of the most important issues of ADSs technology is the choice of the appropriate neutron spectrum for the transmutation of Minor Actinides (MA) and Long Lived Fission Products (LLFP). This report presents the analytical analyses obtained with the deterministic ERANOS code system for the YALINA facility within: (a) the collaboration between Argonne National Laboratory (ANL) of USA and the Joint Institute for Power and Nuclear Research (JIPNR) Sosny of Belarus; and (b) the IAEA coordinated research projects for accelerator driven systems (ADS). This activity is conducted as a part of the Russian Research Reactor Fuel Return (RRRFR) Program and the Global Threat Reduction Initiative (GTRI) of DOE/NNSA.
Date: August 31, 2009
Creator: Gohar, Y. & Aliberti, G.
Object Type: Report
System: The UNT Digital Library
Structured hints : extracting and abstracting domain expertise. (open access)

Structured hints : extracting and abstracting domain expertise.

We propose a new framework for providing information to help optimize domain-specific application codes. Its design addresses problems that derive from the widening gap between the domain problem statement by domain experts and the architectural details of new and future high-end computing systems. The design is particularly well suited to program execution models that incorporate dynamic adaptive methodologies for live tuning of program performance and resource utilization. This new framework, which we call 'structured hints', couples a vocabulary of annotations to a suite of performance metrics. The immediate target is development of a process by which a domain expert describes characteristics of objects and methods in the application code that would not be readily apparent to the compiler; the domain expert provides further information about what quantities might provide the best indications of desirable effect; and the interactive preprocessor identifies potential opportunities for the domain expert to evaluate. Our development of these ideas is progressing in stages from case study, through manual implementation, to automatic or semi-automatic implementation. In this paper we discuss results from our case study, an examination of a large simulation of a neural network modeled after the neocortex.
Date: March 16, 2009
Creator: Hereld, M.; Stevens, R.; Sterling, T.; Gao, G. R.; Science, Mathematics and Computer; Tech., California Inst. of et al.
Object Type: Report
System: The UNT Digital Library
Validation of the G-PASS code : status report. (open access)

Validation of the G-PASS code : status report.

Validation is the process of determining whether the models in a computer code can describe the important phenomena in applications of interest. This report describes past work and proposed future work for validating the Gas Plant Analyzer and System Simulator (G-PASS) code. The G-PASS code was developed for simulating gas reactor and chemical plant system behavior during operational transients and upset events. Results are presented comparing code properties, individual component models, and integrated system behavior against results from four other computer codes. Also identified are two experiment facilities nearing completion that will provide additional data for individual component and integrated system model validation. The main goal of the validation exercise is to ready a version of G-PASS for use as a tool in evaluating vendor designs and providing guidance to vendors on design directions in nuclear-hydrogen applications.
Date: March 12, 2009
Creator: Vilim, R. B.
Object Type: Report
System: The UNT Digital Library
Summary of operations and performance of the Utica aquifer and North Lake Basin Wetlands restoration project in December 2007-November 2008. (open access)

Summary of operations and performance of the Utica aquifer and North Lake Basin Wetlands restoration project in December 2007-November 2008.

This document summarizes the performance of the groundwater restoration systems installed by the Commodity Credit Corporation of the U.S. Department of Agriculture (CCC/USDA) at the former CCC/USDA grain storage facility in Utica, Nebraska, during the fourth year of system operation, from December 1, 2007, until November 30, 2008. Performance in earlier years was reported previously (Argonne 2005, 2006, 2008). In the project at Utica, the CCC/USDA is cooperating with multiple state and federal agencies to remove carbon tetrachloride contamination from a shallow aquifer underlying the town and to provide supplemental treated groundwater for use in the restoration of a nearby wetlands area. Argonne National Laboratory assisted the CCC/USDA by providing technical oversight for the aquifer restoration effort and facilities during this review period. This document presents overviews of the aquifer restoration facilities (Section 2) and system operations (Section 3). The report then describes groundwater production results (Section 4); groundwater treatment results (Section 5); and associated maintenance, system modifications, and costs during the review period (Section 6). Section 7 summarizes the present year of operation.
Date: January 23, 2009
Creator: LaFreniere, L. M.; Sedivy, R. A. & Division, Environmental Science
Object Type: Report
System: The UNT Digital Library
Impact of drought on U.S. steam electric power plant cooling water intakes and related water resource management issues. (open access)

Impact of drought on U.S. steam electric power plant cooling water intakes and related water resource management issues.

This report was funded by the U.S. Department of Energy's (DOE's) National Energy Technology Laboratory (NETL) Existing Plants Research Program, which has an energy-water research effort that focuses on water use at power plants. This study complements their overall research effort by evaluating water availability at power plants under drought conditions. While there are a number of competing demands on water uses, particularly during drought conditions, this report focuses solely on impacts to the U.S. steam electric power plant fleet. Included are both fossil-fuel and nuclear power plants. One plant examined also uses biomass as a fuel. The purpose of this project is to estimate the impact on generation capacity of a drop in water level at U.S. steam electric power plants due to climatic or other conditions. While, as indicated above, the temperature of the water can impact decisions to halt or curtail power plant operations, this report specifically examines impacts as a result of a drop in water levels below power plant submerged cooling water intakes. Impacts due to the combined effects of excessive temperatures of the returned cooling water and elevated temperatures of receiving waters (due to high ambient temperatures associated with drought) may be examined in …
Date: April 3, 2009
Creator: Kimmell, T. A.; Veil, J. A. & Division, Environmental Science
Object Type: Report
System: The UNT Digital Library
Tests of the Hardware and Software for the Reconstruction of Trajectories in the Experiment MINERvA (open access)

Tests of the Hardware and Software for the Reconstruction of Trajectories in the Experiment MINERvA

MINERvA experiment has a highly segmented and high precision neutrino detector able to record events with high statistic (over 13 millions in a four year run). MINERvA uses FERMILAB NuMI beamline. The detector will allow a detailed study of neutrino-nucleon interactions. Moreover, the detector has a target with different materials allowing, for the first time, the study of nuclear effects in neutrino interactions. We present here the work done with the MINERvA reconstruction group that has resulted in: (a) development of new codes to be added to the RecPack package so it can be adapted to the MINERvA detector structure; (b) finding optimum values for two of the MegaTracker reconstruction package variables: PEcut = 4 (minimum number of photo electrons for a signal to be accepted) and Chi2Cut = 200 (maximum value of {chi}{sup 2} for a track to be accepted); (c) testing of the multi anode photomultiplier tubes used at MINERvA in order to determine the correlation between different channels and for checking the device's dark counts.
Date: May 1, 2009
Creator: Palomino Gallo, Jose Luis & /Rio de Janeiro, CBPF
Object Type: Report
System: The UNT Digital Library

Ensemble: 2009-04-14 – A Cappella Choir

Access: Use of this item is restricted to the UNT Community
Choir concert performed at the UNT College of Music Winspear Hall.
Date: April 14, 2009
Creator: University of North Texas. A Cappella Choir.
Object Type: Sound
System: The UNT Digital Library

Ensemble: 2009-03-02 – Spectrum

Access: Use of this item is restricted to the UNT Community
New Music concert performed at the UNT College of Music Recital Hall.
Date: March 2, 2009
Creator: University of North Texas. Composers' Forum.
Object Type: Sound
System: The UNT Digital Library

Ensemble: 2009-09-29 – Choralfest! 2009

Access: Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music Winspear Performance Hall.
Date: September 29, 2009
Creator: University of North Texas. Collegium Singers.
Object Type: Sound
System: The UNT Digital Library

Ensemble: 2009-11-17 – A Cappella Choir

Access: Use of this item is restricted to the UNT Community
Choir concert presented at the UNT College of Music Winspear Performance Hall.
Date: November 17, 2009
Creator: University of North Texas. A Cappella Choir.
Object Type: Sound
System: The UNT Digital Library

Master's Recital: 2009-03-26 - Bryce Myerhoff, tenor

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Recital presented at the UNT College of Music Concert Hall is partial fulfillment of the Master of Music (MM) degree.
Date: March 26, 2009
Creator: Myerhoff, Bryce
Object Type: Sound
System: The UNT Digital Library

Senior Recital: 2009-06-04 - Michael Mario Georgiou, baritone

Access: Use of this item is restricted to the UNT Community
A senior recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Bachelor of Music (BM) degree.
Date: June 4, 2009
Creator: Georgiou, Michael Mario
Object Type: Sound
System: The UNT Digital Library

Doctoral Recital: 2009-04-19 - Sarah Abigail Griffiths, soprano

Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date: April 19, 2009
Creator: Griffiths, Sarah Abigail
Object Type: Sound
System: The UNT Digital Library

Doctoral Recital: 2009-03-05 - Conroy Cupido, tenor

Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date: March 5, 2009
Creator: Cupido, Conroy
Object Type: Sound
System: The UNT Digital Library

Doctoral Recital: 2009-04-13 - Sang Hee Park, soprano

Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date: April 13, 2009
Creator: Park, Sang Hee
Object Type: Sound
System: The UNT Digital Library

[Mitotiliztli Yaoyollohtli group photo]

A photograph of the performance group Mitotiliztli Yaoyollohtli arranged for a group photo. They are wearing their full regalia with penachos, feather headdresses, and chachayotls, seed leggings. In the front are two children and one of the performers is holding a baby.
Date: August 8, 2009
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

Ensemble: 2009-11-04 – Global Rhythms

Access: Use of this item is restricted to the UNT Community
Global rhythms concert presented at the UNT College of Music Recital Hall.
Date: November 4, 2009
Creator: University of North Texas. Bwana Kumala Gamelan Ensemble.
Object Type: Sound
System: The UNT Digital Library