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Divisions, Areas, and Ensembles - Opera - Roméo et Juliette, 2007
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3D CFD Model of a Multi-Cell High Temperature Electrolysis Stack
A three-dimensional computational fluid dynamics (CFD) electrochemical model has been created to model high-temperature electrolysis stack performance and steam electrolysis in the Idaho National Laboratory Integrated Lab Scale (ILS) experiment. The model is made of 60 planar cells stacked on top of each other operated as Solid Oxide Electrolysis Cells (SOEC). Details of the model geometry are specific to a stack that was fabricated by Ceramatec, Inc1. and tested at the Idaho National Laboratory. Inlet and outlet plenum flow and distribution are considered. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT2. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC userdefined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, Nernst potential, operating potential, activation overpotential, anode-side gas composition, cathode-side gas composition, current density and hydrogen production over a range of stack operating conditions. Variations in flow distribution, and species concentration are discussed. End effects of flow and per-cell voltage are also considered.
Date:
November 1, 2007
Creator:
Hawkes, G. L.; O'Brien, J. E. & Stoots, C. M.
Object Type:
Article
System:
The UNT Digital Library
Accident source terms for boiling water reactors with high burnup cores.
The primary objective of this report is to provide the technical basis for development of recommendations for updates to the NUREG-1465 Source Term for BWRs that will extend its applicability to accidents involving high burnup (HBU) cores. However, a secondary objective is to re-examine the fundamental characteristics of the prescription for fission product release to containment described by NUREG-1465. This secondary objective is motivated by an interest to understand the extent to which research into the release and behaviors of radionuclides under accident conditions has altered best-estimate calculations of the integral response of BWRs to severe core damage sequences and the resulting radiological source terms to containment. This report, therefore, documents specific results of fission product source term analyses that will form the basis for the HBU supplement to NUREG-1465. However, commentary is also provided on observed differences between the composite results of the source term calculations performed here and those reflected NUREG-1465 itself.
Date:
November 1, 2007
Creator:
Gauntt, Randall O.; Powers, Dana Auburn & Leonard, Mark Thomas
Object Type:
Report
System:
The UNT Digital Library
Accommodating complexity and human behaviors in decision analysis.
This is the final report for a LDRD effort to address human behavior in decision support systems. One sister LDRD effort reports the extension of this work to include actual human choices and additional simulation analyses. Another provides the background for this effort and the programmatic directions for future work. This specific effort considered the feasibility of five aspects of model development required for analysis viability. To avoid the use of classified information, healthcare decisions and the system embedding them became the illustrative example for assessment.
Date:
November 1, 2007
Creator:
Backus, George A.; Siirola, John Daniel; Schoenwald, David Alan; Strip, David R.; Hirsch, Gary B.; Bastian, Mark S. et al.
Object Type:
Report
System:
The UNT Digital Library
ACRF Ingest Software Status: New, Current, and Future (November 2007)
The purpose of this report is to provide status of the ingest software used to process instrument data for the Atmospheric Radiation Measurement Program Climate Research Facility (ACRF). The report is divided into 4 sections: (1) for news about ingests currently under development, (2) for current production ingests, (3) for future ingest development plans, and (4) for information on retired ingests. Please note that datastreams beginning in “xxx” indicate cases where ingests run at multiple ACRF sites, which results in a datastream(s) for each location.
Date:
November 1, 2007
Creator:
Koontz, AS; Choudhury, S & Ermold, BD: Gaustad, KL
Object Type:
Report
System:
The UNT Digital Library
ADC and TDC implemented using FPGA
Several tests of FPGA devices programmed as analog waveform digitizers are discussed. The ADC uses the ramping-comparing scheme. A multi-channel ADC can be implemented with only a few resistors and capacitors as external components. A periodic logic levels are shaped by passive RC network to generate exponential ramps. The FPGA differential input buffers are used as comparators to compare the ramps with the input signals. The times at which these ramps cross the input signals are digitized by time-to-digital-converters (TDCs) implemented within the FPGA. The TDC portion of the logic alone has potentially a broad range of HEP/nuclear science applications. A 96-channel TDC card using FPGAs as TDCs being designed for the Fermilab MIPP electronics upgrade project is discussed. A deserializer circuit based on multisampling circuit used in the TDC, the 'Digital Phase Follower' (DPF) is also documented.
Date:
November 1, 2007
Creator:
Wu, Jinyuan; Hansen, Sten & Shi, Zonghan
Object Type:
Article
System:
The UNT Digital Library
Adopt-A-Prairie Chicken Newsletter, Fall 2007
Newsletter regarding population control and conservation efforts of the Attwater's Prairie Chicken.
Date:
November 2007
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Afghanistan: Post-War Governance, Security, and U.S. Policy
This report considers the transition in government meant to stabilize Afghanistan. Specifically, the report covers the increasing amount of insurgency in the region. The south in particular has seen a rise in insurgency due to the lack of economic progress made. The report also discusses the NATO led troops in the region.
Date:
November 1, 2007
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
The Age, Volume 29, Number 11, November 2007
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
November 2007
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Agency Financial Report
This report summarizes USAID's financial information as well as their performance during the 2007 fiscal year.
Date:
November 2007
Creator:
United States. Agency International Development
Object Type:
Text
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 132, No. 23, Ed. 1 Thursday, November 1, 2007
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
November 1, 2007
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Altus Times (Altus, Okla.), Vol. 109, No. 131, Ed. 1 Thursday, November 1, 2007
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 1, 2007
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Aluminum alloys for satellite boxes : engineering guidelines for obtaining adequate strength while minimizing residual stresses and machining distortion.
This report provides strategies for minimizing machining distortion in future designs of aluminum alloy satellite boxes, based in part on key findings from this investigation. The report outlines types of aluminum alloys and how they are heat treated, how residual stresses develop during heat treatment of age hardening alloys, ways residual stresses can be minimized, and the design of machining approaches to minimize distortion in parts that contain residual stresses. Specific recommendations are made regarding alloy selection, heat treatment, stress relieving, and machining procedures for boxes requiring various strength levels with emphasis on 6061 and 7075 aluminum alloys.
Date:
November 1, 2007
Creator:
Younger, Mandy S. & Eckelmeyer, Kenneth Hall
Object Type:
Report
System:
The UNT Digital Library
Analytic Approximation with Experimental Data of the Head-Tail Phase Difference from Continuous Transverse Excitation for Measuring Chromaticity
We will explore a method for measuring chromaticity by continuously kicking the beam transversely. This is called the continuous head-tail method for measuring chromaticity. The complete analytic approximation in terms of trigonometric functions is derived for zero transverse emittance beam. A simple formula for calculating chromaticity from experimental data is also shown. Finally the theory is compared with experimental data.
Date:
November 1, 2007
Creator:
Tan, C. Y. & Ranjbar, V. H.
Object Type:
Article
System:
The UNT Digital Library
Application for Permit to Operate a Class III Solid Waste Disposal Site at the Nevada Test Site Area 5 Asbestiform Low-Level Solid Waste Disposal Site
The NTS is located approximately 105 kilometers (km) (65 miles [mi]) northwest of Las Vegas, Nevada (Figure 1). The U.S. Department of Energy (DOE) is the federal lands management authority for the NTS, and NSTec is the Management and Operations contractor. Access on and off the NTS is tightly controlled, restricted, and guarded on a 24-hour basis. The NTS has signs posted along its entire perimeter.
Date:
November 1, 2007
Creator:
National Security Technologies, LLC
Object Type:
Report
System:
The UNT Digital Library
Archer County Advocate (Holliday, Tex.), Vol. 5, No. 30, Ed. 1 Thursday, November 1, 2007
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
November 1, 2007
Creator:
Stevens, Charlotte
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 44, Ed. 1 Thursday, November 1, 2007
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
November 1, 2007
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Assessment of the Potential Fiscal Impacts of Existing and Proposed Transit-Oriented Development in the Dallas Area Rapid Transit Service Area
This report by the University of North Texas Center for Economic Development and Research gives an assessment of the fiscal impacts of transit-oriented development associated with development of the Dallas Area Rapid Transit (DART)light rail system. This analysis considers development near existing and planned light rail stations. The findings support the conclusion that the transit-oriented developments associated with DART Rail stations offer substantial fiscal impacts for local taxing entities.
Date:
November 2007
Creator:
Clower, Terry L.; Weinstein, Bernard L. & Seman, Michael
Object Type:
Report
System:
The UNT Digital Library
Assessment of XM-19 as a Substitute for AISI 348 in ATR Service
It has been proposed that XM-19 alloy be considered as a possible replacement steel for AISI 348 in the construction of Advanced Test Reactor (ATR) capsules. AISI 348 works well, but is currently very difficult to obtain commercially. The superior and desirable mechanical properties of XM-19 alloy have been proven in non-nuclear applications, but no data are available regarding its use in radiation environments. While most 300 series alloys will meet the conditions required in ATR , it cannot be confidently assumed that XM-19 can be substituted without prior qualification in a radiation test. Compared to AISI 348, XM-19 will have an enhanced tendency for phase instabilities due to its higher levels of Ni and, especially, Si. However, transmutation of important elemental components in the highly thermalized ATR spectrum may have a very pronounced effect on its performance during irradiation. Not only will strong transmutation of Mn to Fe reduce the ductility and strength advantages provided by the higher initial Mn content of XM-19, but the extensive loss of Mn will also release from solution much of the N upon which the higher strength of XM-19 depends. In addition, the combined influence of transmutation and Inverse Kirkendall processes may lead …
Date:
November 1, 2007
Creator:
Garner, F. A.; Greenwood, L. R.; Mizia, R. E. & Tyler, C. R.
Object Type:
Report
System:
The UNT Digital Library
Assurance Requirements Compliance for the Greater Confinement Disposal Boreholes, Area 5 Radioactive Waste Management Site, Nevada Test Site
This paper addresses deficiencies identified with the. Performance Assessment for Greater Confinement Disposal (GCD) Boreholes compliance with the Title 40 Code of federal Regulations (CFR) Part 191.14, "Assurance Requirements" (CFR, 1985). The Transuransic Waste Disposal Federal Review Group (TFRG). and U.S Department of Energy Headquarters , need to concur that the assurance requirements have been met at the time of closure of the Area 5 Radioactive Waste Management Site.
Date:
November 1, 2007
Creator:
Wieland, Denise; Yucel, Vefa; Desotell, Lloyd; Shott, Greg; Crowe, Bruce; Krenzien, Susan et al.
Object Type:
Report
System:
The UNT Digital Library
Atmospheric Dispersion Model Validation in Low Wind Conditions
Atmospheric plume dispersion models are used for a variety of purposes including emergency planning and response to hazardous material releases, determining force protection actions in the event of a Weapons of Mass Destruction (WMD) attack and for locating sources of pollution. This study provides a review of previous studies that examine the accuracy of atmospheric plume dispersion models for chemical releases. It considers the principles used to derive air dispersion plume models and looks at three specific models currently in use: Aerial Location of Hazardous Atmospheres (ALOHA), Emergency Prediction Information Code (EPIcode) and Second Order Closure Integrated Puff (SCIPUFF). Results from this study indicate over-prediction bias by the EPIcode and SCIPUFF models and under-prediction bias by the ALOHA model. The experiment parameters were for near field dispersion (less than 100 meters) in low wind speed conditions (less than 2 meters per second).
Date:
November 1, 2007
Creator:
Sawyer, Patrick
Object Type:
Article
System:
The UNT Digital Library
An Audit Report on Performance Measures at the Optometry Board
Report of the Texas State Auditor's Office related to determining if the Optometry Board accurately reported selected key performance measures to ABEST and has adequate control systems in place over the collection, calculation, and reporting of selected key performance measures.
Date:
November 2007
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Performance Measures at the Residential Construction Commission
Report of the Texas State Auditor's Office related to determining whether the Residential Construction Commission accurately reports selected key performance measures to the Automated Budget and Evaluation System of Texas (ABEST) and has adequate control systems in place over the collecting, calculating, and reporting of selected key performance measures.
Date:
November 2007
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Performance Measures at the State Office of Risk Management
Report of the Texas State Auditor's Office related to determining whether the State Office of Risk Management (Office) is accurately reporting the selected performance measures to ABEST and has adequate control systems in place over the collection, calculation, and reporting of the selected performance measures.
Date:
November 2007
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on the Voter Registration System at the Texas Secretary of State's Office
Report of the Texas State Auditor's Office related to determining whether the records in the statewide voter registration database are accurate in accordance with the Help America Vote Act of 2002 (HAVA); assessing whether the statewide voter registration system will be available when needed; and determining whether the Web-based statewide voter registration system is protected from unauthorized access.
Date:
November 2007
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History