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Margins: Following Jesus at the Edge in Luke's Gospel. 107th Abilene Christian University Summit; September 15-18, 2013
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25
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Assessment of Methods to Consolidate Iodine-Loaded Silver-Functionalized Silica Aerogel
The U.S. Department of Energy is currently investigating alternative sorbents for the removal and immobilization of radioiodine from the gas streams in a nuclear fuel reprocessing plant. One of these new sorbents, Ag0-functionalized silica aerogels, shows great promise as a potential replacement for Ag-bearing mordenites because of its high selectivity and sorption capacity for iodine. Moreover, a feasible consolidation of iodine-loaded Ag0-functionalized silica aerogels to a durable SiO2-based waste form makes this aerogel an attractive choice for sequestering radioiodine. This report provides a preliminary assessment of the methods that can be used to consolidate iodine-loaded Ag0-functionalized silica aerogels into a final waste form. In particular, it focuses on experimental investigation of densification of as prepared Ag0-functionalized silica aerogels powders, with or without organic moiety and with or without sintering additive (colloidal silica), with three commercially available techniques: 1) hot uniaxial pressing (HUP), 2) hot isostatic pressing (HIP), and 3) spark plasma sintering (SPS). The densified products were evaluated with helium gas pycnometer for apparent density, with the Archimedes method for apparent density and open porosity, and with high-resolution scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS) for the extent of densification and distribution of individual elements. The preliminary investigation of …
Date:
September 1, 2013
Creator:
Matyas, Josef & Engler, Robert K.
Object Type:
Report
System:
The UNT Digital Library
Athermalized Channeled Spectropolarimeter Enhancement.
Channeled spectropolarimetry can measure the complete polarization state of light as a function of wavelength. Typically, a channeled spectropolarimeter uses high order retarders made of uniaxial crystal to amplitude modulate the measured spectrum with the spectrally-dependent Stokes polarization information. A primary limitation of conventional channeled spectropolarimeters is related to the thermal variability of the retarders. Thermal variation often forces frequent system recalibration, particularly for field deployed systems. However, implementing thermally stable retarders, made of biaxial crystal, results in an athermal channeled spectropolarimeter that relieves the need for frequent recalibration. This report presents experimental results for an anthermalized channeled spectropolarimeter prototype produced using potassium titanyl phosphate. The results of this prototype are compared to the current thermal stabilization state of the art. Finally, the application of the technique to the thermal infrared is studied, and the athermalization concept is applied to an infrared imaging spectropolarimeter design.
Date:
September 1, 2013
Creator:
Jones, Julia Craven; Way, Brandyn Michael; Mercier, Jeffrey Alan & Hunt, Jeffery P.
Object Type:
Report
System:
The UNT Digital Library
An Audit Report on the Reading Program at the Juvenile Justice Department
Report of the Texas State Auditor's Office related to determining whether the Juvenile Justice Department (Department) complied with selected provisions of Texas Education Code, Chapter 30, which requires the Department to implement a comprehensive plan to improve the reading skills of students; determining whether the Department's reporting of performance measure results for reading achievement was accurate and complete; and determining whether the Department designed and implemented effective processes and related controls to help ensure compliance with Department policy and state law governing student attendance.
Date:
September 2013
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 93, No. 174, Ed. 1 Sunday, September 1, 2013
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 1, 2013
Creator:
Bloom, David
Object Type:
Newspaper
System:
The Portal to Texas History
BI's via LibGuides: All your eggs in one basket
Presentation for the 2013 Texas Library Association (TLA) Library Instruction Round Table. This presentation discusses BIs via LibGuides.
Date:
September 2013
Creator:
Whitmer, Susan
Object Type:
Presentation
System:
The UNT Digital Library
A Brief Review of Past INL Work Assessing Radionuclide Content in TMI-2 Melted Fuel Debris: The Use of 144Ce as a Surrogate for Pu Accountancy
This report serves as a literature review of prior work performed at Idaho National Laboratory, and its predecessor organizations Idaho National Engineering Laboratory (INEL) and Idaho National Engineering and Environmental Laboratory (INEEL), studying radionuclide partitioning within the melted fuel debris of the reactor of the Three Mile Island 2 (TMI-2) nuclear power plant. The purpose of this review is to document prior published work that provides supporting evidence of the utility of using 144Ce as a surrogate for plutonium within melted fuel debris. When the TMI-2 accident occurred no quantitative nondestructive analysis (NDA) techniques existed that could assay plutonium in the unconventional wastes from the reactor. However, unpublished work performed at INL by D. W. Akers in the late 1980s through the 1990s demonstrated that passive gamma-ray spectrometry of 144Ce could potentially be used to develop a semi-quantitative correlation for estimating plutonium content in these materials. The fate and transport of radioisotopes in fuel from different regions of the core, including uranium, fission products, and actinides, appear to be well characterized based on the maximum temperature reached by fuel in different parts of the core and the melting point, boiling point, and volatility of those radioisotopes. Also, the chemical interactions …
Date:
September 1, 2013
Creator:
Chichester, D. L. & Thompson, S. J.
Object Type:
Report
System:
The UNT Digital Library
Brownwood Bulletin (Brownwood, Tex.), Vol. 113, No. 244, Ed. 1 Sunday, September 1, 2013
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
September 1, 2013
Creator:
Stuckly, Derrick
Object Type:
Newspaper
System:
The Portal to Texas History
Bubble masks for time-encoded imaging of fast neutrons.
Time-encoded imaging is an approach to directional radiation detection that is being developed at SNL with a focus on fast neutron directional detection. In this technique, a time modulation of a detected neutron signal is induced-typically, a moving mask that attenuates neutrons with a time structure that depends on the source position. An important challenge in time-encoded imaging is to develop high-resolution two-dimensional imaging capabilities; building a mechanically moving high-resolution mask presents challenges both theoretical and technical. We have investigated an alternative to mechanical masks that replaces the solid mask with a liquid such as mineral oil. Instead of fixed blocks of solid material that move in pre-defined patterns, the oil is contained in tubing structures, and carefully introduced air gaps-bubbles-propagate through the tubing, generating moving patterns of oil mask elements and air apertures. Compared to current moving-mask techniques, the bubble mask is simple, since mechanical motion is replaced by gravity-driven bubble propagation; it is flexible, since arbitrary bubble patterns can be generated by a software-controlled valve actuator; and it is potentially high performance, since the tubing and bubble size can be tuned for high-resolution imaging requirements. We have built and tested various single-tube mask elements, and will present results …
Date:
September 1, 2013
Creator:
Brubaker, Erik; Brennan, James S.; Marleau, Peter; Nowack, Aaron B.; Steele, John; Sweany, Melinda et al.
Object Type:
Report
System:
The UNT Digital Library
Building and Calibration of a FAST Model of the SWAY Prototype Floating Wind Turbine: Preprint
Present efforts to verify and validate aero-hydro-servo-elastic numerical simulation tools that predict the dynamic response of a floating offshore wind turbine are primarily limited to code-to-code comparisons or code-to-data comparisons using data from wind-wave basin tests. In partnership with SWAY AS, the National Renewable Energy Laboratory (NREL) installed scientific wind, wave, and motion measurement equipment on the 1/6.5th-scale prototype SWAY floating wind system to collect data to validate a FAST model of the SWAY design in an open-water condition. Nanyang Technological University (NTU), through a collaboration with NREL, assisted in this validation.
Date:
September 1, 2013
Creator:
Koh, J. H.; Robertson, A.; Jonkman, J.; Driscoll, F. & Ng, E. Y. K.
Object Type:
Article
System:
The UNT Digital Library
Building Institutional Capacity in Digital Preservation
Paper for the IPRES Annual Conference on building institutional capacity in digital preservation.
Date:
September 2013
Creator:
Schultz, Matt; Phillips, Mark Edward; Eisenhauer, Stephen & Krabbenhoeft, Nick
Object Type:
Paper
System:
The UNT Digital Library
Building Toward a Small Wind Turbine Site Assessor Credential
Proper site assessment is integral to the development of a successful small wind project. Without a small wind site assessor certification program, consumers, including state incentive program managers, lack a benchmark for differentiating between qualified and nonqualified site assessors. A small wind site assessor best practice manual is being developed as a resource for consumers until a credential program becomes available. This presentation describes the purpose, proposed content, and the National Renewable Energy Laboratory's approach to the development of such a manual.
Date:
September 1, 2013
Creator:
Sinclair, K.
Object Type:
Presentation
System:
The UNT Digital Library
Campaign Finance Guide for Judicial Candidates and Officeholders
Instructional guide to campaign finance for judicial candidates and officeholders in Texas from the Texas Ethics Commission.
Date:
September 1, 2013
Creator:
Texas Ethics Commission
Object Type:
Review
System:
The Portal to Texas History
CAPCOG Connections, September 2013
Monthly newsletter of the Capital Area Council of Governments discussing news , upcoming events, and other information of relevance for regional planning in the Austin, Texas area.
Date:
September 2013
Creator:
Capital Area Council of Governments (Austin, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Christian Chronicle (Oklahoma City, Okla.), Vol. 70, No. 9, Ed. 1 Sunday, September 1, 2013
Monthly newspaper from Oklahoma City, Oklahoma that includes news and information about the Churches of Christ along with advertising.
Date:
September 1, 2013
Creator:
McMillon, Lynn
Object Type:
Newspaper
System:
The Portal to Texas History
Chronicles in Preservation: Building Institutional Capacity in Digital Preservation
Poster presented at the 2013 iPres Conference. The poster discusses the Chronicles in Preservation project, which evaluates how to improve the preservation readiness of digitized and born-digital newspapers on a spectrum of essential to optimal levels of conformance to digital preservation standards.
Date:
September 2013
Creator:
Schultz, Matt; Phillips, Mark Edward; Krabbenhoeft, Nick & Eisenhauer, Stephen
Object Type:
Poster
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 32, No. 31, Ed. 1 Sunday, September 1, 2013
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
September 1, 2013
Creator:
Aldaz, Gina & Mann, Rick
Object Type:
Newspaper
System:
The Portal to Texas History
Communication Requirements and Concept of Operation for Sensor Networks
This report examines the communication requirements and an operation concept for wireless sensor networks in a NPP environment. Specifically, this report addresses the necessary power required for each sensor network node, the transmission frequency, network architecture, capabilities required in each sensor network node, a general of operation including "normal" and "off-normal" conditions,
Date:
September 1, 2013
Creator:
Clayton, Dwight A
Object Type:
Report
System:
The UNT Digital Library
A compact single-camera system for high-speed, simultaneous 3-D velocity and temperature measurements.
The University of Michigan and Sandia National Laboratories collaborated on the initial development of a compact single-camera approach for simultaneously measuring 3-D gasphase velocity and temperature fields at high frame rates. A compact diagnostic tool is desired to enable investigations of flows with limited optical access, such as near-wall flows in an internal combustion engine. These in-cylinder flows play a crucial role in improving engine performance. Thermographic phosphors were proposed as flow and temperature tracers to extend the capabilities of a novel, compact 3D velocimetry diagnostic to include high-speed thermometry. Ratiometric measurements were performed using two spectral bands of laser-induced phosphorescence emission from BaMg2Al10O17:Eu (BAM) phosphors in a heated air flow to determine the optimal optical configuration for accurate temperature measurements. The originally planned multi-year research project ended prematurely after the first year due to the Sandia-sponsored student leaving the research group at the University of Michigan.
Date:
September 1, 2013
Creator:
Lu, Louise; Sick, Volker & Frank, Jonathan H.
Object Type:
Report
System:
The UNT Digital Library
A comparison of methods for representing sparsely sampled random quantities.
This report discusses the treatment of uncertainties stemming from relatively few samples of random quantities. The importance of this topic extends beyond experimental data uncertainty to situations involving uncertainty in model calibration, validation, and prediction. With very sparse data samples it is not practical to have a goal of accurately estimating the underlying probability density function (PDF). Rather, a pragmatic goal is that the uncertainty representation should be conservative so as to bound a specified percentile range of the actual PDF, say the range between 0.025 and .975 percentiles, with reasonable reliability. A second, opposing objective is that the representation not be overly conservative; that it minimally over-estimate the desired percentile range of the actual PDF. The presence of the two opposing objectives makes the sparse-data uncertainty representation problem interesting and difficult. In this report, five uncertainty representation techniques are characterized for their performance on twenty-one test problems (over thousands of trials for each problem) according to these two opposing objectives and other performance measures. Two of the methods, statistical Tolerance Intervals and a kernel density approach specifically developed for handling sparse data, exhibit significantly better overall performance than the others.
Date:
September 1, 2013
Creator:
Romero, Vicente Jose; Swiler, Laura Painton; Urbina, Angel & Mullins, Joshua
Object Type:
Report
System:
The UNT Digital Library
A Comparison of Supercritical Carbon Dioxide Power Cycle Configurations with an Emphasis on CSP Applications
Recent research suggests that an emerging power cycle technology using supercritical carbon dioxide (s-CO2) operated in a closed-loop Brayton cycle offers the potential of equivalent or higher cycle efficiency versus supercritical or superheated steam cycles at temperatures relevant for CSP applications. Preliminary design-point modeling suggests that s-CO2 cycle configurations can be devised that have similar overall efficiency but different temperature and/or pressure characteristics. This paper employs a more detailed heat exchanger model than previous work to compare the recompression and partial cooling cycles, two cycles with high design-point efficiencies, and illustrates the potential advantages of the latter. Integration of the cycles into CSP systems is studied, with a focus on sensible heat thermal storage and direct s-CO2 receivers. Results show the partial cooling cycle may offer a larger temperature difference across the primary heat exchanger, thereby potentially reducing heat exchanger cost and improving CSP receiver efficiency.
Date:
September 1, 2013
Creator:
Neises, T. & Turchi, C.
Object Type:
Presentation
System:
The UNT Digital Library
Compatibility Study for Plastic, Elastomeric, and Metallic Fueling Infrastructure Materials Exposed to Aggressive Formulations of Isobutanol-blended Gasoline
This report talks about Compatibility Study for Plastic, Elastomeric, and Metallic Fueling Infrastructure Materials Exposed to Aggressive Formulations of Isobutanol-blended Gasoline
Date:
September 1, 2013
Creator:
Kass, Michael D.; Janke, Christopher James; Pawel, Steven J.; Thomson, Jeffery K.; Meyer, Harry M., III & Theiss, Timothy J.
Object Type:
Report
System:
The UNT Digital Library
Continuous Reliability Enhancement for Wind (CREW) database : wind plant reliability benchmark.
To benchmark the current U.S. wind turbine fleet reliability performance and identify the major contributors to component-level failures and other downtime events, the Department of Energy funded the development of the Continuous Reliability Enhancement for Wind (CREW) database by Sandia National Laboratories. This report is the third annual Wind Plant Reliability Benchmark, to publically report on CREW findings for the wind industry. The CREW database uses both high resolution Supervisory Control and Data Acquisition (SCADA) data from operating plants and Strategic Power Systems' ORAPWind%C2%AE (Operational Reliability Analysis Program for Wind) data, which consist of downtime and reserve event records and daily summaries of various time categories for each turbine. Together, these data are used as inputs into CREW's reliability modeling. The results presented here include: the primary CREW Benchmark statistics (operational availability, utilization, capacity factor, mean time between events, and mean downtime); time accounting from an availability perspective; time accounting in terms of the combination of wind speed and generation levels; power curve analysis; and top system and component contributors to unavailability.
Date:
September 1, 2013
Creator:
Hines, Valerie Ann-Peters; Ogilvie, Alistair B. & Bond, Cody R.
Object Type:
Report
System:
The UNT Digital Library
Corrective Action Decision Document/Closure Report for Corrective Action Unit 105: Area 2 Yucca Flat Atmospheric Test Sites, Nevada National Security Site, Nevada, Revision 0
This Corrective Action Decision Document/Closure Report presents information supporting the closure of Corrective Action Unit (CAU) 105: Area 2 Yucca Flat Atmospheric Test Sites, Nevada National Security Site, Nevada. CAU 105 comprises the following five corrective action sites (CASs): -02-23-04 Atmospheric Test Site - Whitney Closure In Place -02-23-05 Atmospheric Test Site T-2A Closure In Place -02-23-06 Atmospheric Test Site T-2B Clean Closure -02-23-08 Atmospheric Test Site T-2 Closure In Place -02-23-09 Atmospheric Test Site - Turk Closure In Place The purpose of this Corrective Action Decision Document/Closure Report is to provide justification and documentation supporting the recommendation that no further corrective action is needed for CAU 105 based on the implementation of the corrective actions. Corrective action investigation (CAI) activities were performed from October 22, 2012, through May 23, 2013, as set forth in the Corrective Action Investigation Plan for Corrective Action Unit 105: Area 2 Yucca Flat Atmospheric Test Sites; and in accordance with the Soils Activity Quality Assurance Plan, which establishes requirements, technical planning, and general quality practices.
Date:
September 1, 2013
Creator:
Matthews, Patrick
Object Type:
Report
System:
The UNT Digital Library
Corrosion of high temperature alloys in solar salt at 400, 500, and 680%C2%B0C.
Corrosion tests at 400, 500, and 680%C2%B0C were performed using four high temperature alloys; 347SS, 321SS In625, and HA230. Molten salt chemistry was monitored over time through analysis of nitrite, carbonate, and dissolved metals. Metallography was performed on alloys at 500 and 680%C2%B0C, due to the relatively thin oxide scale observed at 400%C2%B0C. At 500%C2%B0C, corrosion of iron based alloys took the form of chromium depletion and iron oxides, while nickel based alloys also had chromium depletion and formation of NiO. Chromium was detected in relatively low concentrations at this temperature. At 680%C2%B0C, significant surface corrosion occurred with metal losses greater than 450microns/year after 1025hours of exposure. Iron based alloys formed complex iron, sodium, and chromium oxides. Some data suggests grain boundary chromium depletion of 321SS. Nickel alloys formed NiO and metallic nickel corrosion morphologies, with HA230 displaying significant internal oxidation in the form of chromia. Nickel alloys both exhibited worse corrosion than iron based alloys likely due to preferential dissolution of chromium, molybdenum, and tungsten.
Date:
September 1, 2013
Creator:
Kruizenga, Alan Michael; Gill, David Dennis & LaFord, Marianne Elizabeth
Object Type:
Report
System:
The UNT Digital Library