Degree Department

Simulations of Merging and Squeezing Bunches in Booster and AGS (open access)

Simulations of Merging and Squeezing Bunches in Booster and AGS

N/A
Date: September 1, 2012
Creator: Gardner, C. J.
Object Type: Report
System: The UNT Digital Library
Simulations of RF Capture with Barrier Bucket in Booster at Injections (open access)

Simulations of RF Capture with Barrier Bucket in Booster at Injections

N/A
Date: May 1, 2012
Creator: Gardner, C. J.
Object Type: Report
System: The UNT Digital Library
Site characterization methodology for deep borehole disposal. (open access)

Site characterization methodology for deep borehole disposal.

None
Date: September 1, 2012
Creator: Vaughn, Palmer; Arnold, Bill Walter; Altman, Susan Jeanne; Brady, Patrick Vane & Gardner, William Payton
Object Type: Report
System: The UNT Digital Library
Proton beam lifetime increase with 10- and 12-pole correctors in the Relativistic Heavy Ion Collider (open access)

Proton beam lifetime increase with 10- and 12-pole correctors in the Relativistic Heavy Ion Collider

N/A
Date: November 1, 2012
Creator: Fischer, W.; Beebe-Wang, J.; Gu, X.; Luo, Y. & Nemesure, S.
Object Type: Report
System: The UNT Digital Library
Compact X-ray Light Source Workshop Report (open access)

Compact X-ray Light Source Workshop Report

This report, produced jointly by EMSL and FCSD, is the result of a workshop held in September 2011 that examined the utility of a compact x-ray light source (CXLS) in addressing many scientific challenges critical to advancing energy science and technology.
Date: December 1, 2012
Creator: Thevuthasan, Suntharampillai; Evans, James E.; Terminello, Louis J.; Koppenaal, David W.; Manke, Kristin L. & Plata, Charity
Object Type: Report
System: The UNT Digital Library
Integrating Variable Renewable Energy in Electric Power Markets: Best Practices from International Experience (open access)

Integrating Variable Renewable Energy in Electric Power Markets: Best Practices from International Experience

Many countries -- reflecting very different geographies, markets, and power systems -- are successfully managing high levels of variable renewable energy on the electric grid, including that from wind and solar energy. This study documents the diverse approaches to effective integration of variable renewable energy among six countries -- Australia (South Australia), Denmark, Germany, Ireland, Spain, and the United States (Western region-Colorado and Texas)-- and summarizes policy best practices that energy ministers and other stakeholders can pursue to ensure that electricity markets and power systems can effectively coevolve with increasing penetrations of variable renewable energy. Each country has crafted its own combination of policies, market designs, and system operations to achieve the system reliability and flexibility needed to successfully integrate renewables. Notwithstanding this diversity, the approaches taken by the countries studied all coalesce around five strategic areas: lead public engagement, particularly for new transmission; coordinate and integrate planning; develop rules for market evolution that enable system flexibility; expand access to diverse resources and geographic footprint of operations; and improve system operations. The ability to maintain a broad ecosystem perspective, to organize and make available the wealth of experiences, and to ensure a clear path from analysis to enactment should be …
Date: April 1, 2012
Creator: Cochran, J.; Bird, L.; Heeter, J. & Arent, D. A.
Object Type: Report
System: The UNT Digital Library
Investigation of Some Transparent Metal Oxides as Damp Heat Protective Coating for CIGS Solar Cells: Preprint (open access)

Investigation of Some Transparent Metal Oxides as Damp Heat Protective Coating for CIGS Solar Cells: Preprint

We investigated the protective effectiveness of some transparent metal oxides (TMO) on CIGS solar cell coupons against damp heat (DH) exposure at 85oC and 85% relative humidity (RH). Sputter-deposited bilayer ZnO (BZO) with up to 0.5-um Al-doped ZnO (AZO) layer and 0.2-um bilayer InZnO were used as 'inherent' part of device structure on CdS/CIGS/Mo/SLG. Sputter-deposited 0.2-um ZnSnO and atomic layer deposited (ALD) 0.1-um Al2O3 were used as overcoat on typical BZO/CdS/CIGS/Mo/SLG solar cells. The results were all negative -- all TMO-coated CIGS cells exhibited substantial degradation in DH. Combining the optical photographs, PL and EL imaging, SEM surface micro-morphology, coupled with XRD, I-V and QE measurements, the causes of the device degradations are attributed to hydrolytic corrosion, flaking, micro-cracking, and delamination induced by the DH moisture. Mechanical stress and decrease in crystallinity (grain size effect) could be additional degrading factors for thicker AZO grown on CdS/CIGS.
Date: October 1, 2012
Creator: Pern, F. J.; Yan, F.; Zaaunbrecher, B.; To, B.; Perkins, J. & Noufi, R.
Object Type: Article
System: The UNT Digital Library
Compatibility Study for Plastic, Elastomeric, and Metallic Fueling Infrastructure Materials Exposed to Aggressive Formulations of Ethanol-blended Gasoline (open access)

Compatibility Study for Plastic, Elastomeric, and Metallic Fueling Infrastructure Materials Exposed to Aggressive Formulations of Ethanol-blended Gasoline

In 2008 Oak Ridge National Laboratory began a series of experiments to evaluate the compatibility of fueling infrastructure materials with intermediate levels of ethanol-blended gasoline. Initially, the focus was elastomers, metals, and sealants, and the test fuels were Fuel C, CE10a, CE17a and CE25a. The results of these studies were published in 2010. Follow-on studies were performed with an emphasis on plastic (thermoplastic and thermoset) materials used in underground storage and dispenser systems. These materials were exposed to test fuels of Fuel C and CE25a. Upon completion of this effort, it was felt that additional compatibility data with higher ethanol blends was needed and another round of experimentation was performed on elastomers, metals, and plastics with CE50a and CE85a test fuels. Compatibility of polymers typically relates to the solubility of the solid polymer with a solvent. It can also mean susceptibility to chemical attack, but the polymers and test fuels evaluated in this study are not considered to be chemically reactive with each other. Solubility in polymers is typically assessed by measuring the volume swell of the polymer exposed to the solvent of interest. Elastomers are a class of polymers that are predominantly used as seals, and most o-ring and …
Date: July 1, 2012
Creator: Kass, Michael D; Pawel, Steven J; Theiss, Timothy J & Janke, Christopher James
Object Type: Report
System: The UNT Digital Library
Data Analysis for Real Time Identification of Grid Disruptions (open access)

Data Analysis for Real Time Identification of Grid Disruptions

The U.S. electric power system comprises multiple distinct interconnections of generators, high voltage transmission systems, and local distribution systems that maintain a continuous balance between generation and load with impressive levels of efficiency and reliability. This critical infrastructure has served the nation remarkably well, but is likely to see more changes over the next decade than it has seen over the past century. In particular, the widespread deployment of renewable generation, smart-grid controls, energy storage, and new conducting materials will require fundamental changes in grid planning and the way we run the power grid. Two challenges in the realization of the smart grid technology are the ability to visualize the deluge of expected data streams for global situational awareness; as well as the ability to detect disruptive and classify such events from spatially-distributed high-speed power system frequency measurements. One element of smart grid technology is the installation of a wide-area frequency measurement system on the electric poles in the streets for conditions monitoring of the distribution lines. This would provide frequency measurements about the status of the electric grid and possible information about impending problems before they start compounding and cascading. The ability to monitor the distribution lines is just …
Date: January 1, 2012
Creator: Chandola, Varun; Omitaomu, Olufemi A & Fernandez, Steven J
Object Type: Book
System: The UNT Digital Library
Consistent Adjoint Driven Importance Sampling using Space, Energy and Angle (open access)

Consistent Adjoint Driven Importance Sampling using Space, Energy and Angle

For challenging radiation transport problems, hybrid methods combine the accuracy of Monte Carlo methods with the global information present in deterministic methods. One of the most successful hybrid methods is CADIS Consistent Adjoint Driven Importance Sampling. This method uses a deterministic adjoint solution to construct a biased source distribution and consistent weight windows to optimize a specific tally in a Monte Carlo calculation. The method has been implemented into transport codes using just the spatial and energy information from the deterministic adjoint and has been used in many applications to compute tallies with much higher figures-of-merit than analog calculations. CADIS also outperforms user-supplied importance values, which usually take long periods of user time to develop. This work extends CADIS to develop weight windows that are a function of the position, energy, and direction of the Monte Carlo particle. Two types of consistent source biasing are presented: one method that biases the source in space and energy while preserving the original directional distribution and one method that biases the source in space, energy, and direction. Seven simple example problems are presented which compare the use of the standard space/energy CADIS with the new space/energy/angle treatments.
Date: August 1, 2012
Creator: Peplow, Douglas E.; Mosher, Scott W & Evans, Thomas M
Object Type: Report
System: The UNT Digital Library
A retrospective of VAWT technology. (open access)

A retrospective of VAWT technology.

The study of Vertical-Axis Wind Turbine (VAWT) technology at Sandia National Laboratories started in the 1970's and concluded in the 1990's. These studies concentrated on the Darrieus configurations because of their high inherent efficiency, but other configurations (e.g., the Savonius turbine) were also examined. The Sandia VAWT program culminated with the design of the 34-m 'Test Bed' Darrieus VAWT. This turbine was designed and built to test various VAWT design concepts and to provide the necessary databases to validate analytical design codes and algorithms. Using the Test Bed as their starting point, FloWind Corp. developed a commercial VAWT product line with composite blades and an extended height-to-diameter ratio. The purpose of this paper is to discuss the design process and results of the Sandia 34-m VAWT Test Bed program and the FloWind prototype development program with an eye toward future offshore designs. This paper is our retrospective of the design, analysis, testing and commercial process. Special emphasis is given to those lessons learned that will aid in the development of an off-shore VAWT.
Date: January 1, 2012
Creator: Ashwill, Thomas D.; Sutherland, Herbert J. & Berg, Dale E.
Object Type: Report
System: The UNT Digital Library
Dose Modeling Evaluations and Technical Support Document for the Authorized Limits Request for the C-746-U Landfill at the Paducah Gaseous Diffusion Plant, Paducah, Kentucky (open access)

Dose Modeling Evaluations and Technical Support Document for the Authorized Limits Request for the C-746-U Landfill at the Paducah Gaseous Diffusion Plant, Paducah, Kentucky

This report contains the technical basis in support of the DOE?s derivation of Authorized Limits (ALs) for the DOE Paducah C-746-U Landfill. A complete description of the methodology, including an assessment of the input parameters, model inputs, and results is provided in this report. This report also provides initial recommendations on applying the derived soil guidelines. The ORISE-derived soil guidelines are specifically applicable to the Landfill at the end of its operational life. A suggested 'upper bound' multiple of the derived soil guidelines for individual shipments is provided.
Date: June 1, 2012
Creator: Boerner, A. J.; Maldonado, D. G. & Hansen, Tom
Object Type: Report
System: The UNT Digital Library
Final Report Phase I Study to Characterize the Market Potential for Non-Motorized Travel (open access)

Final Report Phase I Study to Characterize the Market Potential for Non-Motorized Travel

The idea of livable communities suggests that people should have the option to utilize non-motorized travel (NMT), specifically walking and bicycling, to conduct their daily tasks. Forecasting personal travel by walk and bike is necessary as part of regional transportation planning, and requires fine detail not only about individual travel, but also on transportation and neighborhood infrastructure. In an attempt to characterize the 'market' potential for NMT, the Office of Planning, Federal Highway Administration (FHWA) funded the Center for Transportation Analysis (CTA) of the Oak Ridge National Laboratory (ORNL) to conduct a study. The objectives of this effort were to identify factors that influence communities to walk and bike and to examine why, or why not, travelers walk and bike in their communities. This study relied on information collected under the 2009 National Household Travel Survey (NHTS) as the major source of data, and was supplemented with data from the American Community Survey (ACS), educational survey, health, employment, and others. Initial statistical screening methods were applied to sort through over 400 potential predictor variables, and examined with various measures (e.g., walk trip per person, walk mileage per person, bike trip per person, bike mileage per person) as the dependent variables. …
Date: June 1, 2012
Creator: Hwang, Ho-Ling; Reuscher, Tim; Wilson, Daniel W & Schmoyer, Richard L
Object Type: Report
System: The UNT Digital Library
Exploration and Resource Assessment at Mountain Home Air Force Base, Idaho Using an Integrated Team Approach (open access)

Exploration and Resource Assessment at Mountain Home Air Force Base, Idaho Using an Integrated Team Approach

The U.S. Air Force is facing a number of challenges as it moves into the future, one of the biggest being how to provide safe and secure energy to support base operations. A team of scientists and engineers met at Mountain Home Air Force Base near Boise, Idaho, to discuss the possibility of exploring for geothermal resources under the base. The team identified that there was a reasonable potential for geothermal resources based on data from an existing well. In addition, a regional gravity map helped identify several possible locations for drilling a new well. The team identified several possible sources of funding for this well—the most logical being to use U.S. Department of Energy funds to drill the upper half of the well and U.S. Air Force funds to drill the bottom half of the well. The well was designed as a slimhole well in accordance with State of Idaho Department of Water Resources rules and regulations. Drilling operations commenced at the Mountain Home site in July of 2011 and were completed in January of 2012. Temperatures increased gradually, especially below a depth of 2000 ft. Temperatures increased more rapidly below a depth of 5500 ft. The bottom of …
Date: October 1, 2012
Creator: Armstrong, Joseph C.; Breckenridge, Robert P.; Nielson, Dennis L.; Shervais, John W. & Wood, Thomas R.
Object Type: Article
System: The UNT Digital Library
Navajo Generating Station and Air Visibility Regulations: Alternatives and Impacts (open access)

Navajo Generating Station and Air Visibility Regulations: Alternatives and Impacts

Pursuant to the Clean Air Act, the U.S. Environmental Protection Agency (EPA) announced in 2009 its intent to issue rules for controlling emissions from Navajo Generating Station that could affect visibility at the Grand Canyon and at several other national parks and wilderness areas. The final rule will conform to what EPA determines is the best available retrofit technology (BART) for the control of haze-causing air pollutants, especially nitrogen oxides. While EPA is ultimately responsible for setting Navajo Generating Station's BART standards in its final rule, it will be the U.S. Department of the Interior's responsibility to manage compliance and the related impacts. This study aims to assist both Interior and EPA by providing an objective assessment of issues relating to the power sector.
Date: January 1, 2012
Creator: Hurlbut, D. J.; Haase, S.; Brinkman, G.; Funk, K.; Gelman, R.; Lantz, E. et al.
Object Type: Report
System: The UNT Digital Library
Eastern Interconnection Demand Response Potential (open access)

Eastern Interconnection Demand Response Potential

None
Date: November 1, 2012
Creator: Baek, Young Sun; Hadley, Stanton W; Uria Martinez, Rocio; Oladosu, Gbadebo A; Smith, Alexander M; Li, Fangxing et al.
Object Type: Report
System: The UNT Digital Library
Postdoctoral program guidelines. (open access)

Postdoctoral program guidelines.

We, the Postdoc Professional Development Program (PD2P) leadership team, wrote these postdoc guidelines to be a starting point for communication between new postdocs, their staff mentors, and their managers. These guidelines detail expectations and responsibilities of the three parties, as well as list relevant contacts. The purpose of the Postdoc Program is to bring in talented, creative people who enrich Sandia's environment by performing innovative R&D, as well as by stimulating intellectual curiosity and learning. Postdocs are temporary employees who come to Sandia for career development and advancement reasons. In general, the postdoc term is 1 year, renewable up to five times for a total of six years. However, center practices may vary; check with your manager. At term, a postdoc may apply for a staff position at Sandia or choose to move to university, industry or another lab. It is our vision that those who leave become long-term collaborators and advocates whose relationships with Sandia have a positive effect upon our national constituency.
Date: April 1, 2012
Creator: Teich-McGoldrick, Stephanie; Miller, Andrew W.; Sava, Dorina Florentina; Liu, Yanli; Ferreira, Summer Rhodes; Biedermann, Laura Butler et al.
Object Type: Report
System: The UNT Digital Library
Systems biology approach to bioremediation (open access)

Systems biology approach to bioremediation

Bioremediation has historically been approached as a �black box� in terms of our fundamental understanding. Thus it succeeds and fails, seldom without a complete understanding of why. Systems biology is an integrated research approach to study complex biological systems, by investigating interactions and networks at the molecular, cellular, community, and ecosystem level. The knowledge of these interactions within individual components is fundamental to understanding the dynamics of the ecosystem under investigation. Understanding and modeling functional microbial community structure and stress responses in environments at all levels have tremendous implications for our fundamental understanding of hydrobiogeochemical processes and the potential for making bioremediation breakthroughs and illuminating the �black box�.
Date: January 1, 2012
Creator: Chakraborty, R.; Wu, C. H. & Hazen, T. C.
Object Type: Article
System: The UNT Digital Library
Sweetwater Reporter (Sweetwater, Tex.), Vol. 114, No. 038, Ed. 1 Thursday, March 1, 2012 (open access)

Sweetwater Reporter (Sweetwater, Tex.), Vol. 114, No. 038, Ed. 1 Thursday, March 1, 2012

Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date: March 1, 2012
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 41, No. 44, Ed. 1 Thursday, November 1, 2012 (open access)

Port Aransas South Jetty (Port Aransas, Tex.), Vol. 41, No. 44, Ed. 1 Thursday, November 1, 2012

Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date: November 1, 2012
Creator: Judson, Mary Henkel
Object Type: Newspaper
System: The Portal to Texas History
Hilltop Views (Austin, Tex.), Vol. 31, No. 1, Ed. 1 Wednesday, February 1, 2012 (open access)

Hilltop Views (Austin, Tex.), Vol. 31, No. 1, Ed. 1 Wednesday, February 1, 2012

Weekly student newspaper from St. Edward's University in Austin, Texas that includes news and information of interest to the college community along with advertising.
Date: February 1, 2012
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
Final report on LDRD : MBE growth and transport properties of carbon-doped high mobility two-dimensional hole systems. (open access)

Final report on LDRD : MBE growth and transport properties of carbon-doped high mobility two-dimensional hole systems.

None
Date: September 1, 2012
Creator: Reno, John Louis
Object Type: Report
System: The UNT Digital Library
Haven't a Cue? Mapping the CUE Space as an Aid to HRA Modeling (open access)

Haven't a Cue? Mapping the CUE Space as an Aid to HRA Modeling

Advances in automation present a new modeling environment for the human reliability analysis (HRA) practitioner. Many, if not most, current day HRA methods have their origin in characterizing and quantifying human performance in analog environments where mode awareness and system status indications are potentially less comprehensive, but simpler to comprehend at a glance when compared to advanced presentation systems. The introduction of highly complex automation has the potential to lead to: decreased levels of situation awareness caused by the need for increased monitoring; confusion regarding the often non-obvious causes of automation failures, and emergent system dependencies that formerly may have been uncharacterized. Understanding the relation of incoming cues available to operators during plant upset conditions, in conjunction with operating procedures, yields insight into understanding the nature of the expected operator response in this control room environment. Static systems methods such as fault trees do not contain the appropriate temporal information or necessarily specify the relationship among cues leading to operator response. In this paper, we do not attempt to replace standard performance shaping factors commonly used in HRA nor offer a new HRA method, existing methods may suffice. In this paper we strive to enhance current understanding of the basis …
Date: June 1, 2012
Creator: Gertman, David I; Boring, Ronald L; Hugo, Jacques & Phoenix, William
Object Type: Article
System: The UNT Digital Library
Waters, Seas and Wine: Science for Successful Climate Adaptation (open access)

Waters, Seas and Wine: Science for Successful Climate Adaptation

is a growing demand for adaptation science as a vehicle for delivering critical knowledge to public and private organizations that are attempting to adapt to the changing climate. This expansion of adaptation science is occurring, however, in the absence of a robust understanding of how that science can or should contribute to successful adaptation. For the adaptation science enterprise to be successful, it must provide knowledge that has value to adaptation actors. Accomplishing this objective, however, often requires more than just research, and, in fact, may necessitate new cultural perspectives regarding the role of science in public policy as well as new kinds of researchers and research institutions. These issues are explored through a series of case studies from Australia and the United Kingdom that illustrate the various ways in which adaptation science engages with adaptation processes and the extent to which that science can be judged as successful. The case studies demonstrate that there are multiple pathways by which adaptation science can be successful, depending on the knowledge that is needed by a particular actor at a particular stage in the adaptation process. Nevertheless, there are significant opportunities for the more explicit alignment of the needs of decision-makers and …
Date: January 1, 2012
Creator: Preston, Benjamin L
Object Type: Book
System: The UNT Digital Library