Partner
UNT Libraries Government Documents Department
948
Abilene Christian University Library
165
UNT Libraries Special Collections
147
UNT Libraries
135
Oklahoma Historical Society
72
Brownwood Public Library
26
National Museum of the Pacific War/Admiral Nimitz Foundation
24
Ennis Public Library
21
Sterling Municipal Library
21
Boyce Ditto Public Library
19
80 More
Collection
Office of Scientific & Technical Information Technical Reports
626
Texas Digital Newspaper Program
496
Tocker Foundation Grant
207
Abilene Library Consortium
171
ACU Summit Lecture Series
164
Congressional Research Service Reports
142
Government Accountability Office Reports
105
Multicultural Center Records
101
Oklahoma Digital Newspaper Program
93
The Greensheet
75
133 More
Degree Department
Degree Discipline
Degree Level
Country
States
Year
Month
Language
1,932 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
1,932
next
Accident Analysis for the NIST Research Reactor Before and After Fuel Conversion
Postulated accidents have been analyzed for the 20 MW D2O-moderated research reactor (NBSR) at the National Institute of Standards and Technology (NIST). The analysis has been carried out for the present core, which contains high enriched uranium (HEU) fuel and for a proposed equilibrium core with low enriched uranium (LEU) fuel. The analyses employ state-of-the-art calculational methods. Three-dimensional Monte Carlo neutron transport calculations were performed with the MCNPX code to determine homogenized fuel compositions in the lower and upper halves of each fuel element and to determine the resulting neutronic properties of the core. The accident analysis employed a model of the primary loop with the RELAP5 code. The model includes the primary pumps, shutdown pumps outlet valves, heat exchanger, fuel elements, and flow channels for both the six inner and twenty-four outer fuel elements. Evaluations were performed for the following accidents: (1) control rod withdrawal startup accident, (2) maximum reactivity insertion accident, (3) loss-of-flow accident resulting from loss of electrical power with an assumption of failure of shutdown cooling pumps, (4) loss-of-flow accident resulting from a primary pump seizure, and (5) loss-of-flow accident resulting from inadvertent throttling of a flow control valve. In addition, natural circulation cooling at low …
Date:
September 30, 2012
Creator:
Baek, J.; Diamond, D.; Cuadra, A.; Hanson, A. L.; Cheng, L. Y. & Brown, N. R.
Object Type:
Report
System:
The UNT Digital Library
Advanced Battery Manufacturing (VA)
LiFeBATT has concentrated its recent testing and evaluation on the safety of its batteries. There appears to be a good margin of safety with respect to overheating of the cells and the cases being utilized for the batteries are specifically designed to dissipate any heat built up during charging. This aspect of LiFeBATT’s products will be even more fully investigated, and assuming ongoing positive results, it will become a major component of marketing efforts for the batteries. LiFeBATT has continued to receive prismatic 20 Amp hour cells from Taiwan. Further testing continues to indicate significant advantages over the previously available 15 Ah cells. Battery packs are being assembled with battery management systems in the Danville facility. Comprehensive tests are underway at Sandia National Laboratory to provide further documentation of the advantages of these 20 Ah cells. The company is pursuing its work with Hybrid Vehicles of Danville to critically evaluate the 20 Ah cells in a hybrid, armored vehicle being developed for military and security applications. Results have been even more encouraging than they were initially. LiFeBATT is expanding its work with several OEM customers to build a worldwide distribution network. These customers include a major automotive consulting group in …
Date:
September 30, 2012
Creator:
Stratton, Jeremy
Object Type:
Report
System:
The UNT Digital Library
Advanced Boost System Developing for High EGR Applications
To support industry efforts of clean and efficient internal combustion engine development for passenger and commercial applications • This program focuses on turbocharger improvement for medium and light duty diesel applications, from complete system optimization percepective to enable commercialization of advanced diesel combustion technologies, such as HCCI/LTC. • Improve combined turbocharger efficiency up to 10% or fuel economy by 3% on FTP cycle at Tier II Bin 5 emission level.
Date:
September 30, 2012
Creator:
Sun, Harold
Object Type:
Report
System:
The UNT Digital Library
Advanced Horizontal Well Recirculation Systems for Geothermal Energy Recovery in Sedimentary Formations
There is increased recognition that geothermal energy resources are more widespread than previously thought, with potential for providing a significant amount of sustainable clean energy worldwide. Recent advances in drilling, completion, and production technology from the oil and gas industry can now be applied to unlock vast new geothermal resources, with some estimates for potential electricity generation from geothermal energy now on the order of 2 million megawatts. Terralog USA, in collaboration with the University of California, Irvine (UCI), are currently investigating advanced design concepts for paired horizontal well recirculation systems, optimally configured for geothermal energy recovery in permeable sedimentary and crystalline formations of varying structure and material properties. This two-year research project, funded by the US Department of Energy, includes combined efforts for: 1) Resource characterization; 2) Small and large scale laboratory investigations; 3) Numerical simulation at both the laboratory and field scale; and 4) Engineering feasibility studies and economic evaluations. The research project is currently in its early stages. This paper summarizes our technical approach and preliminary findings related to potential resources, small-scale laboratory simulation, and supporting numerical simulation efforts.
Date:
September 30, 2012
Creator:
Bruno, Mike; Detwiler, Russell L.; Lao, Kang; Serajian, Vahid; Elkhoury, Jean; Diessl, Julia et al.
Object Type:
Article
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 113, No. 87, Ed. 1 Sunday, September 30, 2012
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 30, 2012
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analytical-Numerical Sharp-Interface Model of CO2 Sequestration and Application to Illinois Basin, 2012, December
This report talks about Analytical-Numerical Sharp-Interface Model of CO2 Sequestration and Application to Illinois Basin.
Date:
September 30, 2012
Creator:
Person, Mark
Object Type:
Report
System:
The UNT Digital Library
ARRA-Multi-Level Energy Storage and Controls for Large-Scale Wind Energy Integration
The Project Objective is to design innovative energy storage architecture and associated controls for high wind penetration to increase reliability and market acceptance of wind power. The project goals are to facilitate wind energy integration at different levels by design and control of suitable energy storage systems. The three levels of wind power system are: Balancing Control Center level, Wind Power Plant level, and Wind Power Generator level. Our scopes are to smooth the wind power fluctuation and also ensure adequate battery life. In the new hybrid energy storage system (HESS) design for wind power generation application, the boundary levels of the state of charge of the battery and that of the supercapacitor are used in the control strategy. In the controller, some logic gates are also used to control the operating time durations of the battery. The sizing method is based on the average fluctuation of wind profiles of a specific wind station. The calculated battery size is dependent on the size of the supercapacitor, state of charge of the supercapacitor and battery wear. To accommodate the wind power fluctuation, a hybrid energy storage system (HESS) consisting of battery energy system (BESS) and super-capacitor is adopted in this project. …
Date:
September 30, 2012
Creator:
Gao, David Wenzhong
Object Type:
Report
System:
The UNT Digital Library
Assessing the Efficacy of the Aerobic Methanotrophic Biofilter in Methane Hydrate Environments
In October 2008 the University of California at Santa Barbara (UCSB) initiated investigations of water column methane oxidation in methane hydrate environments, through a project funded by the National Energy Technology Laboratory (NETL) entitled: assessing the efficacy of the aerobic methanotrophic biofilter in methane hydrate environments. This Final Report describes the scientific advances and discoveries made under this award as well as the importance of these discoveries in the broader context of the research area. Benthic microbial mats inhabit the sea floor in areas where reduced chemicals such as sulfide reach the more oxidizing water that overlies the sediment. We set out to investigate the role that methanotrophs play in such mats at locations where methane reaches the sea floor along with sulfide. Mats were sampled from several seep environments and multiple sets were grown in-situ at a hydrocarbon seep in the Santa Barbara Basin. Mats grown in-situ were returned to the laboratory and used to perform stable isotope probing experiments in which they were treated with 13C-enriched methane. The microbial community was analyzed, demonstrating that three or more microbial groups became enriched in methane?s carbon: methanotrophs that presumably utilize methane directly, methylotrophs that presumably consume methanol excreted by the …
Date:
September 30, 2012
Creator:
Valentine, David
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 92, No. 195, Ed. 1 Sunday, September 30, 2012
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 30, 2012
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 112, No. 301, Ed. 1 Sunday, September 30, 2012
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
September 30, 2012
Creator:
Deason, Gene
Object Type:
Newspaper
System:
The Portal to Texas History
Building A Universal Nuclear Energy Density Functional (UNEDF)
During the period of Dec. 1 2006 â Jun. 30, 2012, the UNEDF collaboration carried out a comprehensive study of all nuclei, based on the most accurate knowledge of the strong nuclear interaction, the most reliable theoretical approaches, the most advanced algorithms, and extensive computational resources, with a view towards scaling to the petaflop platforms and beyond. The long-term vision initiated with UNEDF is to arrive at a comprehensive, quantitative, and unified description of nuclei and their reactions, grounded in the fundamental interactions between the constituent nucleons. We seek to replace current phenomenological models of nuclear structure and reactions with a well-founded microscopic theory that delivers maximum predictive power with well-quantified uncertainties. Specifically, the mission of this project has been three-fold: first, to find an optimal energy density functional (EDF) using all our knowledge of the nucleonic Hamiltonian and basic nuclear properties; second, to apply the EDF theory and its extensions to validate the functional using all the available relevant nuclear structure and reaction data; third, to apply the validated theory to properties of interest that cannot be measured, in particular the properties needed for reaction theory. The main physics areas of UNEDF, defined at the beginning of the project, …
Date:
September 30, 2012
Creator:
Carlson, Joe, Los Alamos National Laboratory, Los Alamos, NM; Furnstahl, Dick, Ohio State University, Columbus, OH; Horoi, Mihai, Central Michigan University, Mount Pleasant, MI; Lusk, Rusty, Argonne National Laboratory, Argonne, IL; Nazarewicz, Witek, University of Tennessee, Knoxville, TN; Ng, Esmond, Berkeley National Laboratory, Berkeley, CA et al.
Object Type:
Report
System:
The UNT Digital Library
Building Energy Model Development for Retrofit Homes
Based on previous research conducted by Pacific Northwest National Laboratory and Florida Solar Energy Center providing technical assistance to implement 22 deep energy retrofits across the nation, 6 homes were selected in Florida and Texas for detailed post-retrofit energy modeling to assess realized energy savings (Chandra et al, 2012). However, assessing realized savings can be difficult for some homes where pre-retrofit occupancy and energy performance are unknown. Initially, savings had been estimated using a HERS Index comparison for these homes. However, this does not account for confounding factors such as occupancy and weather. This research addresses a method to more reliably assess energy savings achieved in deep energy retrofits for which pre-retrofit utility bills or occupancy information in not available. A metered home, Riverdale, was selected as a test case for development of a modeling procedure to account occupancy and weather factors, potentially creating more accurate estimates of energy savings. This “true up” procedure was developed using Energy Gauge USA software and post-retrofit homeowner information and utility bills. The 12 step process adjusts the post-retrofit modeling results to correlate with post-retrofit utility bills and known occupancy information. The “trued” post retrofit model is then used to estimate pre-retrofit energy consumption …
Date:
September 30, 2012
Creator:
Chasar, David; McIlvaine, Janet; Blanchard, Jeremy; Widder, Sarah H. & Baechler, Michael C.
Object Type:
Report
System:
The UNT Digital Library
Burleson Star (Burleson, Tex.), Vol. 47, No. 97, Ed. 1 Sunday, September 30, 2012
Semi-weekly newspaper from Burleson, Texas that includes local, state, and national news along with advertising.
Date:
September 30, 2012
Creator:
Porter, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Bwr Anticipated Transients Without Scram in the Mellla+ Expanded Operating Domain: Part 2: Sensitivity Studies for Events Leading to Instability
This is the second in a series of reports on the response of a BWR/5 boiling water reactor to anticipated transients without reactor scram (ATWS) when operating in the expanded operating domain MELLLA+. In this report ATWS events initiated by a turbine trip are considered at two points in the fuel cycle: beginning of cycle (BOC) and peak excess reactivity (PHE, close to the middle of the cycle). The effect of the gap (between the fuel pellet and clad) conductance modeling, turbine bypass fractions, and initial core flow rates are evaluated.. Two limiting values of gas-gap conductance, the lowest value of 5,000 W/m2-K at BOC and the highest value of 161,000 W/m2-K at PHE, are compared with corresponding base cases which utilized the dynamic gas-gap model. Turbine bypass fractions analyzed are 10% and 25% at PHE and these two sensitivity cases are compared with the 100% bypass base case. The reduced core flow case at 75% of nominal core flow is analyzed at PHE and compared with the base case of 85% core flow. The simulations were carried out using the TRACE/PARCS code system and models developed for a previous study at three different times during a fuel cycle with …
Date:
September 30, 2012
Creator:
L., Cheng; J., Baek; Cuadra, A.; Aronson, A. & Diamond, D.
Object Type:
Report
System:
The UNT Digital Library
CALiPER Exploratory Study Office and Classroom Recessed Troffer Lighting - ARRA Report
This report is a brief summary of a project exploring LED versions of a very common luminaire type, the recessed troffer. It describes the planning and preparation for a mockup of 24 pairs of troffers in a simulated office space, where observations and comments were recorded.
Date:
September 30, 2012
Creator:
Miller, Naomi J.
Object Type:
Report
System:
The UNT Digital Library
Condition Based Monitoring of Gas Turbine Combustion Components
The objective of this program is to develop sensors that allow condition based monitoring of critical combustion parts of gas turbines. Siemens teamed with innovative, small companies that were developing sensor concepts that could monitor wearing and cracking of hot turbine parts. A magnetic crack monitoring sensor concept developed by JENTEK Sensors, Inc. was evaluated in laboratory tests. Designs for engine application were evaluated. The inability to develop a robust lead wire to transmit the signal long distances resulted in a discontinuation of this concept. An optical wear sensor concept proposed by K Sciences GP, LLC was tested in proof-of concept testing. The sensor concept depended, however, on optical fiber tips wearing with the loaded part. The fiber tip wear resulted in too much optical input variability; the sensor could not provide adequate stability for measurement. Siemens developed an alternative optical wear sensor approach that used a commercial PHILTEC, Inc. optical gap sensor with an optical spacer to remove fibers from the wearing surface. The gap sensor measured the length of the wearing spacer to follow loaded part wear. This optical wear sensor was developed to a Technology Readiness Level (TRL) of 5. It was validated in lab tests and …
Date:
September 30, 2012
Creator:
Ulerich, Nancy; Kidane, Getnet; Spiegelberg, Christine & Tevs, Nikolai
Object Type:
Report
System:
The UNT Digital Library
Demonstration Assessment of Light-Emitting Diode (LED) Post-Top Lighting at Central Park in New York City
A review of five post-top light-emitting diode (LED) pedestrian luminaires installed in New York City's Central Park for possible replacement to the existing metal halide post-top luminaire. This report reviews the energy savings potential and lighting delivered by the LED post-top luminaires.
Date:
September 30, 2012
Creator:
Myer, Michael; Goettel, Russell T. & Kinzey, Bruce R.
Object Type:
Report
System:
The UNT Digital Library
Design Concepts for Co-Production of Power, Fuels & Chemicals Via Coal/Biomass Mixtures
The overall goal of the program is to develop design concepts, incorporating advanced technologies in areas such as oxygen production, feed systems, gas cleanup, component separations and gas turbines, for integrated and economically viable coal and biomass fed gasification facilities equipped with carbon capture and storage for the following scenarios: (i) coproduction of power along with hydrogen, (ii) coproduction of power along with fuels, (iii) coproduction of power along with petrochemicals, and (iv) coproduction of power along with agricultural chemicals. To achieve this goal, specifically the following objectives are met in this proposed project: (i) identify advanced technology options and innovative preliminary design concepts that synergistically integrate plant subsections, (ii) develop steady state system simulations to predict plant efficiency and environmental signature, (iii) develop plant cost estimates by capacity factoring major subsystems or by major equipment items where required, and then capital, operating and maintenance cost estimates, and (iv) perform techno- economic analyses for the above described coproduction facilities. Thermal efficiencies for the electricity only cases with 90% carbon capture are 38.26% and 36.76% (HHV basis) with the bituminous and the lignite feedstocks respectively. For the coproduction cases (where 50% of the energy exported is in the form of electricity), …
Date:
September 30, 2012
Creator:
Rao, A. D.; Chen, Q. & Samuelsen, G. S.
Object Type:
Report
System:
The UNT Digital Library
Development and Implementation of 3-D, High Speed Capacitance Tomography for Imaging Large-Scale, Cold-Flow Circulating Fluidized Bed
A detailed understanding of multiphase flow behavior inside a Circulating Fluidized Bed (CFB) requires a 3-D technique capable of visualizing the flow field in real-time. Electrical Capacitance Volume Tomography (ECVT) is a newly developed technique that can provide such measurements. The attractiveness of the technique is in its low profile sensors, fast imaging speed and scalability to different section sizes, low operating cost, and safety. Moreover, the flexibility of ECVT sensors enable them to be designed around virtually any geometry, rendering them suitable to be used for measurement of solid flows in exit regions of the CFB. Tech4Imaging LLC has worked under contract with the U.S. Department of Energyâs National Energy Technology Laboratory (DOE NETL) to develop an ECVT system for cold flow visualization and install it on a 12 inch ID circulating fluidized bed. The objective of this project was to help advance multi-phase flow science through implementation of an ECVT system on a cold flow model at DOE NETL. This project has responded to multi-phase community and industry needs of developing a tool that can be used to develop flow models, validate computational fluid dynamics simulations, provide detailed real-time feedback of process variables, and provide a comprehensive understating …
Date:
September 30, 2012
Creator:
Marashdeh, Qussai
Object Type:
Report
System:
The UNT Digital Library
Development of Novel Ceramic Nanofilm-Fiber Integrated Optical Sensors for Rapid Detection of Coal Derived Synthesis Gas
The overall goal of this project is to conduct fundamental studies on advanced ceramic materials and fiber optic devices for developing new types of high temperature (>500{degree}C) fiber optic chemical sensors (FOCS) for monitoring fossil (mainly coal) and biomass derived gases in power plants. The primary technical objective is to investigate and demonstrate the nanocrystalline doped-ceramic thin film enabled FOCS that possess desired stability, sensitivity and selectivity for in-situ, rapid gas detection in the syngas streams from gasification and combustion flue gases. This report summarizes research works of two integrated parts: (1) development of metal oxide solid thin films as sensing materials for detection and measurement of important gas components relevant to the coal- and biomass-derived syngas and combustion gas streams at high temperatures; and (2) development of fiber optic devices that are potentially useful for constructing FOCS in combination with the solid oxide thin films identified in this program.
Date:
September 30, 2012
Creator:
Dong, Junhang; Xiao, Hai; Tang, Xiling; Jiang, Hongmin; Remmel, Kurtis & Kaur, Amardeep
Object Type:
Report
System:
The UNT Digital Library
Energy Commissioning Agent/Auditor Online Training Program
None
Date:
September 30, 2012
Creator:
Evans, Deane
Object Type:
Report
System:
The UNT Digital Library
Energy Saving Melting and Revert Reduction Technology: Improved Die Casting Process to Preserve the Life of the Inserts
The goal of this project was to study the combined effects of die design, proper internal cooling and efficient die lubricants on die life. The project targeted improvements in die casting insert life by: Optomized Die Design for Reduced Surface Temperature: The life of die casting dies is significantly shorter when the die is exposed to elevated temperature for significant periods of time. Any die operated under conditions leading to surface temperature in excess of 1050oF undergoes structural changes that reduce its strength. Optimized die design can improve die life significantly. This improvement can be accomplished by means of cooling lines, baffles and bubblers in the die. A key objective of the project was to establish criteria for the minimal distance of the cooling lines from the surface. This effort was supported with alloys and machining by BohlerUddeholm, Dunn Steel, HH Stark and Rex Buckeye. In plant testing and evaluation was conducted as in-kind cost share at St. Clair Die Casting. The Uddeholm Dievar steel evaluated in this program showed superior resistance to thermal fatigue resistance. Based on the experimental evidence, cooling lines could be placed as close as 0.5"Â from the surface. Die Life Extension by Optimized Die Lubrication: …
Date:
September 30, 2012
Creator:
David Schwam, PI & Xuejun Zhu, Sr. Research Associate
Object Type:
Report
System:
The UNT Digital Library
The Ennis Daily News (Ennis, Tex.), Ed. 1 Sunday, September 30, 2012
Daily newspaper from Ennis, Texas that includes local, state and national news along with advertising.
Date:
September 30, 2012
Creator:
Todaro, Nick
Object Type:
Newspaper
System:
The Portal to Texas History
Establishing a Comprehensive Wind Energy Program
This project was directed at establishing a comprehensive wind energy program in Indiana, including both educational and research components. A graduate/undergraduate course ME-514 - Fundamentals of Wind Energy has been established and offered and an interactive prediction of VAWT performance developed. Vertical axis wind turbines for education and research have been acquired, instrumented and installed on the roof top of a building on the Calumet campus and at West Lafayette (Kepner Lab). Computational Fluid Dynamics (CFD) calculations have been performed to simulate these urban wind environments. Also, modal dynamic testing of the West Lafayette VAWT has been performed and a novel horizontal axis design initiated. The 50-meter meteorological tower data obtained at the Purdue Beck Agricultural Research Center have been analyzed and the Purdue Reconfigurable Micro Wind Farm established and simulations directed at the investigation of wind farm configurations initiated. The virtual wind turbine and wind turbine farm simulation in the Visualization Lab has been initiated.
Date:
September 30, 2012
Creator:
Fleeter, Sanford
Object Type:
Report
System:
The UNT Digital Library