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Mechanisms Leading to Co-Existence of Gas Hydrate in Ocean Sediments
In this project we have sought to explain the co-existence of gas and hydrate phases in sediments within the gas hydrate stability zone. We have focused on the gas/brine interface at the scale of individual grains in the sediment. The capillary forces associated with a gas/brine interface play a dominant role in many processes that occur in the pores of sediments and sedimentary rocks. The mechanical forces associated with the same interface can lead to fracture initiation and propagation in hydrate-bearing sediments. Thus the unifying theme of the research reported here is that pore scale phenomena are key to understanding large scale phenomena in hydrate-bearing sediments whenever a free gas phase is present. Our analysis of pore-scale phenomena in this project has delineated three regimes that govern processes in which the gas phase pressure is increasing: fracturing, capillary fingering and viscous fingering. These regimes are characterized by different morphology of the region invaded by the gas. On the other hand when the gas phase pressure is decreasing, the corresponding regimes are capillary fingering and compaction. In this project, we studied all these regimes except compaction. Many processes of interest in hydrate-bearing sediments can be better understood when placed in the …
Date:
December 31, 2011
Creator:
Bryant, Steven & Juanes, Ruben
Object Type:
Report
System:
The UNT Digital Library
Mechanisms Leading to Co-Existence of Gas Hydrate in Ocean Sediments
In this project we have sought to explain the co-existence of gas and hydrate phases in sediments within the gas hydrate stability zone. We have focused on the gas/brine interface at the scale of individual grains in the sediment. The capillary forces associated with a gas/brine interface play a dominant role in many processes that occur in the pores of sediments and sedimentary rocks. The mechanical forces associated with the same interface can lead to fracture initiation and propagation in hydrate-bearing sediments. Thus the unifying theme of the research reported here is that pore scale phenomena are key to understanding large scale phenomena in hydrate-bearing sediments whenever a free gas phase is present. Our analysis of pore-scale phenomena in this project has delineated three regimes that govern processes in which the gas phase pressure is increasing: fracturing, capillary fingering and viscous fingering. These regimes are characterized by different morphology of the region invaded by the gas. On the other hand when the gas phase pressure is decreasing, the corresponding regimes are capillary fingering and compaction. In this project, we studied all these regimes except compaction. Many processes of interest in hydrate-bearing sediments can be better understood when placed in the …
Date:
December 31, 2011
Creator:
Bryant, Steven & Juanes, Ruben
Object Type:
Report
System:
The UNT Digital Library
Asian Carp and the Great Lakes Region
This report describes non-indigenous Asian carp species migrating to the United States, the economy at risk, federal response, and litigation.
Date:
March 31, 2010
Creator:
Buck, Eugene H.; Upton, Harold F.; Stern, Charles V. & Nicholas, James E.
Object Type:
Report
System:
The UNT Digital Library
Lignite Fuel Enhancement
Pulverized coal power plants which fire lignites and other low-rank high-moisture coals generally operate with reduced efficiencies and increased stack emissions due to the impacts of high fuel moisture on stack heat loss and pulverizer and fan power. A process that uses plant waste heat sources to evaporate a portion of the fuel moisture from the lignite feedstock in a moving bed fluidized bed dryer (FBD) was developed in the U.S. by a team led by Great River Energy (GRE). The demonstration was conducted with Department of Energy (DOE) funding under DOE Award Number DE-FC26-04NT41763. The objectives of GRE's Lignite Fuel Enhancement project were to demonstrate reduction in lignite moisture content by using heat rejected from the power plant, apply technology at full scale at Coal Creek Station (CCS), and commercialize it. The Coal Creek Project has involved several stages, beginning with lignite drying tests in a laboratory-scale FBD at the Energy Research Center (ERC) and development of theoretical models for predicting dryer performance. Using results from these early stage research efforts, GRE built a 2 ton/hour pilot-scale dryer, and a 75 ton/hour prototype drying system at Coal Creek Station. Operated over a range of drying conditions, the results from …
Date:
March 31, 2010
Creator:
Bullinger, Charles & Sarunac, Nenad
Object Type:
Report
System:
The UNT Digital Library
Battleground Energy Recovery Project
In October 2009, the project partners began a 36-month effort to develop an innovative, commercial-scale demonstration project incorporating state-of-the-art waste heat recovery technology at Clean Harbors, Inc., a large hazardous waste incinerator site located in Deer Park, Texas. With financial support provided by the U.S. Department of Energy, the Battleground Energy Recovery Project was launched to advance waste heat recovery solutions into the hazardous waste incineration market, an area that has seen little adoption of heat recovery in the United States. The goal of the project was to accelerate the use of energy-efficient, waste heat recovery technology as an alternative means to produce steam for industrial processes. The project had three main engineering and business objectives: Prove Feasibility of Waste Heat Recovery Technology at a Hazardous Waste Incinerator Complex; Provide Low-cost Steam to a Major Polypropylene Plant Using Waste Heat; and ï· Create a Showcase Waste Heat Recovery Demonstration Project.
Date:
December 31, 2011
Creator:
Bullock, Daniel
Object Type:
Report
System:
The UNT Digital Library
Investigating the Magnetorotational Instability with Dedalus, and Open-Souce Hydrodynamics Code
The magnetorotational instability is a fluid instability that causes the onset of turbulence in discs with poloidal magnetic fields. It is believed to be an important mechanism in the physics of accretion discs, namely in its ability to transport angular momentum outward. A similar instability arising in systems with a helical magnetic field may be easier to produce in laboratory experiments using liquid sodium, but the applicability of this phenomenon to astrophysical discs is unclear. To explore and compare the properties of these standard and helical magnetorotational instabilities (MRI and HRMI, respectively), magnetohydrodynamic (MHD) capabilities were added to Dedalus, an open-source hydrodynamics simulator. Dedalus is a Python-based pseudospectral code that uses external libraries and parallelization with the goal of achieving speeds competitive with codes implemented in lower-level languages. This paper will outline the MHD equations as implemented in Dedalus, the steps taken to improve the performance of the code, and the status of MRI investigations using Dedalus.
Date:
August 31, 2012
Creator:
Burns, Keaton J & /UC, Berkeley, aff SLAC
Object Type:
Report
System:
The UNT Digital Library
The Purple Heart: Background and Issues for Congress
This report explores the history of the Purple Heart and changes in eligibility over time as well as several current issues facing Congress.
Date:
December 31, 2015
Creator:
Burrelli, David F.
Object Type:
Report
System:
The UNT Digital Library
Advanced Gearless Drivetrain - Phase I Technical Report
Boulder Wind Power (ÃÂâÃÂÃÂÃÂÃÂBWPÃÂâÃÂÃÂÃÂÃÂ) collaborated with the National Renewable Energy Laboratory (NREL) in Golden, Colorado, to demonstrate the economics of scaling an advanced gearless drivetrain technology to 6MW (and larger) turbine applications. The project goal was to show that this advanced drivetrain technology enables a cost of energy of less than $0.10/kWH in offshore applications. This drivetrain technology achieves this Cost of Energy (ÃÂâÃÂÃÂÃÂÃÂCOEÃÂâÃÂÃÂÃÂÃÂ) advantage via a 70% greater torque density versus current state-of-the-art drivetrain technologies. In addition, a new dynamically compliant design strategy is required to optimize turbine system-level COE. The BWP generator is uniquely suited for this new design strategy. This project developed a concept design for a 6MW drivetrain and culminated in a plan for a system-level test of this technology at 3MW scale. The project further demonstrated the advantage of the BWP drivetrain with increasing power ratings, with conceptual designs through 10 MW.
Date:
August 31, 2012
Creator:
Butterfield, Sandy; Smith, Jim; Petch, Derek; Sullivan, Brian; Smith, Peter & Pierce, Kirk
Object Type:
Report
System:
The UNT Digital Library
Alternative Methods to Add Freshwater to the Nueces Delta
Studying the Environmental flow needs for Texas Rivers and Estuaries as part of the adaptive management phase
Date:
August 31, 2017
Creator:
Buzan, David & To, Ernest
Object Type:
Report
System:
The Portal to Texas History
Single-Particle Dynamics in Electron Storage Rings with Extremely Low Emittance
Electron storage rings are widely used for high luminosity colliders, damping rings in high-energy linear colliders, and synchrotron light sources. They have become essential facilities to study high-energy physics and material and medical sciences. To further increase the luminosity of colliders or the brightness of synchrotron light sources, the beam emittance is being continually pushed downward, recently to the nanometer region. In the next decade, another order of reduction is expected. This requirement of ultra-low emittance presents many design challenges in beam dynamics, including better analysis of maps and improvement of dynamic apertures. To meet these challenges, we have refined transfer maps of common elements in storage rings and developed a new method to compute the resonance driving terms as they are built up along a beamline. The method is successfully applied to a design of PEP-X as a future light source with 100-pm emittance. As a result, we discovered many unexpected cancelations of the fourth-order resonance terms driven by sextupoles within an achromat.
Date:
May 31, 2011
Creator:
Cai, Yunhai
Object Type:
Article
System:
The UNT Digital Library
Cancer Prevention and Research Institute of Texas Financial Statements: 2019
Financial statements from the Cancer Prevention and Research Institute of Texas (CPRIT) documenting financial statements of government activities and fund of CPRIT, as well as related notes, for fiscal year 2019.
Date:
August 31, 2019
Creator:
Cancer Prevention and Research Institute of Texas
Object Type:
Report
System:
The Portal to Texas History
Policy Issues in the General Motors Vehicle Recall
This report discusses the National Highway Traffic Safety Administration (NHTSA) process by which vehicle safety defects are identified and vehicles are recalled, as well as the impact that the 2009 GM bankruptcy may have on liability for this defect.
Date:
March 31, 2014
Creator:
Canis, Bill; Peterman, David Randall & Pettit, Carol A.
Object Type:
Report
System:
The UNT Digital Library
Secondary Waste Form Down Selection Data Package – Ceramicrete
As part of high-level waste pretreatment and immobilized low activity waste processing, liquid secondary wastes will be generated that will be transferred to the Effluent Treatment Facility on the Hanford Site for further treatment. These liquid secondary wastes will be converted to stable solid waste forms that will be disposed in the Integrated Disposal Facility. Currently, four waste forms are being considered for stabilization and solidification of the liquid secondary wastes. These waste forms are Cast Stone, Ceramicrete, DuraLith, and Fluidized Bed Steam Reformer. The preferred alternative will be down selected from these four waste forms. Pacific Northwest National Laboratory is developing data packages to support the down selection process. The objective of the data packages is to identify, evaluate, and summarize the existing information on the four waste forms being considered for stabilization and solidification of the liquid secondary wastes. The information included will be based on information available in the open literature and from data obtained from testing currently underway. This data package is for the Ceramicrete waste form. Ceramicrete is a relatively new engineering material developed at Argonne National Laboratory to treat radioactive and hazardous waste streams (e.g., Wagh 2004; Wagh et al. 1999a, 2003; Singh et …
Date:
August 31, 2011
Creator:
Cantrell, Kirk J. & Westsik, Joseph H.
Object Type:
Report
System:
The UNT Digital Library
Federal Involvement in Flood Response and Flood Infrastructure Repair: Storm Sandy Recovery
Report regarding congressional efforts to structure federal actions and programs so they provide incentives to reduce flood risk without unduly infringing on private property rights or usurping local decision making.
Date:
October 31, 2012
Creator:
Carter, Nicole T.
Object Type:
Report
System:
The UNT Digital Library
Indiana Advanced Electric Vehicle Training and Education Consortium (I-AEVtec)
The Indiana Advanced Electric Vehicle Training and Education Consortium (I-AEVtec) is an educational partnership between six universities and colleges in Indiana focused on developing the education materials needed to support electric vehicle technology. The I-AEVtec has developed and delivered a number of degree and certificate programs that address various aspects of electric vehicle technology, including over 30 new or significantly modified courses to support these programs. These courses were shared on the SmartEnergyHub. The I-AEVtec program also had a significant outreach to the community with particular focus on K12 students. Finally, the evGrandPrix was established which is a university/college student electric go-kart race, where the students get hands-on experience in designing, building and racing electric vehicles. The evGrandPrix now includes student teams from across the US as well as from Europe and it is currently being held on Opening Day weekend for the Indy500 at the Indianapolis Motor Speedway.
Date:
January 31, 2013
Creator:
Caruthers, James; Dietz, J.; Pelter, Libby; Chen, Jie; Roberson, Glen; McGinn, Paul et al.
Object Type:
Report
System:
The UNT Digital Library
Simulations and Analysis of an Infrared Prism Spectrometer for Ultra-short Bunch Length Diagnostics at the Linac Coherent Light Source
None
Date:
August 31, 2012
Creator:
Cass, Julie
Object Type:
Report
System:
The UNT Digital Library
A Comparative Study of Welded ODS Cladding materials for AFCI/GNEP Applications
This research project involved working on the pressure resistance welding of oxide dispersion strengthened (ODS) alloys which will have a large role to play in advanced nuclear reactors. The project also demonstrated the research collaboration between four universities and one nation laboratory (Idaho National Laboratory) with participation from an industry for developing for ODS alloys. These alloys contain a high number density of very fine oxide particles that can impart high temperature strength and radiation damage resistance suitable for in-core applications in advanced reactors. The conventional fusion welding techniques tend to produce porosity-laden microstructure in the weld region and lead to the agglomeration and non-uniform distribution of the neededoxide particles. That is why two solid state welding methods - pressure resistance welding (PRW) and friction stir welding (FSW) - were chosen to be evaluated in this project. The proposal is expected to support the development of Advanced Burner Reactors (ABR) under the GNEP program (now incorporated in Fuel Cycle R&D program). The outcomes of the concluded research include training of graduate and undergraduate students and get them interested in nuclear related research.
Date:
March 31, 2011
Creator:
Charit, Indrajit; Frary, Megan; Butt, Darryl; Murty, K.L.; Zirker, Larry; Cole, James et al.
Object Type:
Report
System:
The UNT Digital Library
Surface-mediated suppression of radiation damage in GaN
None
Date:
October 31, 2011
Creator:
Charnvanichborikarn, S; Myers, M T; Shao, L & Kucheyev, S O
Object Type:
Article
System:
The UNT Digital Library
Intergovernmental Advanced Stationary PEM Fuel Cell System Demonstration Final Report
A program to complete the design, construction and demonstration of a PEMFC system fuelled by Ethanol, LPG or NG for telecom applications was initiated in October 2007. Early in the program the economics for Ethanol were shown to be unfeasible and permission was given by DOE to focus on LPG only. The design and construction of a prototype unit was completed in Jun 2009 using commercially available PEM FC stack from Ballard Power Systems. During the course of testing, the high pressure drop of the stack was shown to be problematic in terms of control and stability of the reformer. Also, due to the power requirements for air compression the overall efficiency of the system was shown to be lower than a similar system using internally developed low pressure drop FC stack. In Q3 2009, the decision was made to change to the Plug power stack and a second prototype was built and tested. Overall net efficiency was shown to be 31.5% at 3 kW output. Total output of the system is 6 kW. Using the new stack hardware, material cost reduction of 63% was achieved over the previous Alpha design. During a November 2009 review meeting Plug Power proposed …
Date:
August 31, 2011
Creator:
Chartrand, Rich
Object Type:
Report
System:
The UNT Digital Library
Towards laboratory-produced relativistic electron-positron pair-plasmas
Relativistic pair-plasmas and jets are believed to exist in many astrophysical objects and are often invoked to explain energetic phenomena related to Gamma Ray Bursts and Black Holes. On earth, positrons from radioactive isotopes or accelerators are used extensively at low energies (sub-MeV) in areas related to surface science positron emission tomography and basic antimatter science. Experimental platforms capable of producing the high-temperature pair-plasma and high-flux jets required to simulate astrophysical positron conditions have so far been absent. In the last few years, we performed extensive experiments generating positrons with intense lasers where we found that relativistic electron and positron jets are produced by irradiating a solid gold target with an intense picosecond laser pulse. The positron temperatures in directions parallel and transverse to the beam both exceeded 0.5 MeV, and the density of electrons and positrons in these jets are of order 10{sup 16} cm{sup -3} and 10{sup 13} cm{sup -3}, respectively. With the advent of high-energy ultra-short laser pulses, we expect that a charge-neutral, relativistic pair-plasma is achievable, a novel regime of laboratory-produced hot dense matter. This talk will present some details of the laser-produced pair-plasma experiments.
Date:
August 31, 2010
Creator:
Chen, H.; Wilks, S. C.; Meyerhofer, D. D.; Beiersdorfer, P.; Cauble, R.; Dollar, F. et al.
Object Type:
Article
System:
The UNT Digital Library
BWR Anticipated Transients Without SCRAM in the MELLLA+ Expanded Operating Domain Part 4: Sensitivity Studies for Events Leading to Emergency Depressurization
This is the fourth 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 closure of main steam isolation valves are analyzed at beginning-of-cycle, and end-of-full-power-life, conditions. The objective is to understand the sensitivity of ATWS-ED events to the intial operating core flow and to the spectrally corrected moderator density history (void history). Different water level control strategies are considered. The ATWS events are simulated for a sufficiently long time (2500 s) to understand the response of key components and the potential for fuel damage or damage to the wetwell (suppression pool). These events lead to the automatic trip of recirculation pumps; and operator actions to activate the emergency depressurization system when the wetwell has reached the heat capacity temperature limit, and to control power through water level control and the injection of soluble boron. The simulations were carried out using the TRACE/PARCS code system and models developed for a previous study with all relevant BWR/5 systems.
Date:
December 31, 2012
Creator:
Cheng, Lap-Yan; Baek, Joo-Seok; Cuadra, Arantxa; Aronson,Arnold; Diamond, David & Yarsky, Peter
Object Type:
Report
System:
The UNT Digital Library
Transparent Ceramic Scintillators for Gamma Spectroscopy and Radiography
None
Date:
August 31, 2010
Creator:
Cherepy, N. J.; Kuntz, J. D.; Seeley, Z. M.; Fisher, S. E.; Drury, O. B.; Sturm, B. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Wave-actuated power take-off device for electricity generation
Since 2008, Resolute Marine Energy, Inc. (RME) has been engaged in the development of a rigidly moored shallow-water point absorber wave energy converter, the "3D-WEC". RME anticipated that the 3D-WEC configuration with a fully buoyant point absorber buoy coupled to three power take off (PTO) units by a tripod array of tethers would achieve higher power capture than a more conventional 1-D configuration with a single tether and PTO. The investigation conducted under this program and documented herein addressed the following principal research question regarding RME'ÂÂs power take off (PTO) concept for its 3D-WEC: Is RME's winch-driven generator PTO concept, previously implemented at sub-scale and tested at the Ohmsett wave tank facility, scalable in a cost-effective manner to significant power levels ÂÂe.g., 10 to 100kW?
Date:
January 31, 2013
Creator:
Chertok, Allan
Object Type:
Report
System:
The UNT Digital Library
Afghanistan Casualties: Military Forces and Civilians
This report collects statistics from a variety of sources on casualties sustained during Operation Enduring Freedom (OEF), which began on October 7, 2001, and is ongoing. OEF actions take place primarily in Afghanistan, but OEF casualties also include American casualties in other countries, listed within this report.
Date:
May 31, 2012
Creator:
Chesser, Susan G.
Object Type:
Report
System:
The UNT Digital Library