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Sludge Washing And Demonstration Of The DWPF Flowsheet In The SRNL Shielded Cells For Sludge Batch 8 Qualification
The current Waste Solidification Engineering (WSE) practice is to prepare sludge batches in Tank 51 by transferring sludge from other tanks to Tank 51. Tank 51 sludge is washed and transferred to Tank 40, the current Defense Waste Processing Facility (DWPF) feed tank. Prior to transfer of Tank 51 to Tank 40, the Savannah River National Laboratory (SRNL) typically simulates the Tank Farm and DWPF processes using a Tank 51 sample (referred to as the qualification sample). WSE requested the SRNL to perform characterization on a Sludge Batch 8 (SB8) sample and demonstrate the DWPF flowsheet in the SRNL shielded cells for SB8 as the final qualification process required prior to SB8 transfer from Tank 51 to Tank 40. A 3-L sample from Tank 51 (the SB8 qualification sample; Tank Farm sample HTF-51-12-80) was received by SRNL on September 20, 2012. The as-received sample was characterized prior to being washed. The washed material was further characterized and used as the material for the DWPF process simulation including a Sludge Receipt and Adjustment Tank (SRAT) cycle, a Slurry Mix Evaporator (SME) cycle, and glass fabrication and chemical durability measurements.
Date:
April 26, 2013
Creator:
Pareizs, J. M. & Crawford, C. L.
Object Type:
Report
System:
The UNT Digital Library
Sault Tribe Building Efficiency Energy Audits
The Sault Ste. Marie Tribe of Chippewa Indians is working to reduce energy consumption and expense in Tribally-owned governmental buildings. The Sault Ste. Marie Tribe of Chippewa Indians will conduct energy audits of nine Tribally-owned governmental buildings in three counties in the Upper Peninsula of Michigan to provide a basis for evaluating and selecting the technical and economic viability of energy efficiency improvement options. The Sault Ste. Marie Tribe of Chippewa Indians will follow established Tribal procurement policies and procedures to secure the services of a qualified provider to conduct energy audits of nine designated buildings. The contracted provider will be required to provide a progress schedule to the Tribe prior to commencing the project and submit an updated schedule with their monthly billings. Findings and analysis reports will be required for buildings as completed, and a complete Energy Audit Summary Report will be required to be submitted with the provider?s final billing. Conducting energy audits of the nine governmental buildings will disclose building inefficiencies to prioritize and address, resulting in reduced energy consumption and expense. These savings will allow Tribal resources to be reallocated to direct services, which will benefit Tribal members and families.
Date:
September 26, 2013
Creator:
Holt, Jeffrey W.
Object Type:
Report
System:
The UNT Digital Library
Possible Suppression of Resonant Signals for Split-UED by Mixing at the LHC?
None
Date:
August 26, 2013
Creator:
Rizzo, Thomas G.
Object Type:
Article
System:
The UNT Digital Library
Final Technical Report for DOE Award DE-FG02-07ER64403 [Modeling of Microbially Induced Calcite Precipitation for the Immobilization of Strontium-90 Using a Variable Velocity Streamtube Ensemble]
Biogeochemical modeling using PHREEQC2 and a streamtube ensemble approach is utilized to understand a well-to-well subsurface treatment system at the Vadose Zone Research Park (VZRP) near Idaho Falls, Idaho. Treatment involves in situ microbially-mediated ureolysis to induce calcite precipitation for the immobilization of strontium-90. PHREEQC2 is utilized to model the kinetically-controlled ureolysis and consequent calcite precipitation. Reaction kinetics, equilibrium phases, and cation exchange are used within PHREEQC2 to track pH and levels of calcium, ammonium, urea, and calcite precipitation over time, within a series of one-dimensional advective-dispersive transport paths creating a streamtube ensemble representation of the well-to-well transport. An understanding of the impact of physical heterogeneities within this radial flowfield is critical for remediation design; we address this via the streamtube approach: instead of depicting spatial extents of solutes in the subsurface we focus on their arrival distribution at the control well(s). Traditionally, each streamtube maintains uniform velocity; however in radial flow in homogeneous media, the velocity within any given streamtube is spatially-variable in a common way, being highest at the input and output wells and approaching a minimum at the midpoint between the wells. This idealized velocity variability is of significance in the case of ureolytically driven calcite precipitation. …
Date:
August 26, 2013
Creator:
Ginn, Timothy R. & Weathers, Tess
Object Type:
Report
System:
The UNT Digital Library
Irradiation Experiment Conceptual Design Parameters for Murr Leu U-MO Fuel Conversion
None
Date:
March 26, 2013
Creator:
Stillman, J.; Feldman, E.; Stevens, J.; Wilson, E.; Foyto, L.; Kutikkad, K. et al.
Object Type:
Report
System:
The UNT Digital Library
Molecular Characterization of Bacterial Respiration on Minerals
The overall aim of this project was to contribute to our fundamental understanding of proteins and biological processes under extreme environmental conditions. We sought to define the biochemical and physiological mechanisms that underlie biodegradative and other cellular processes in normal, extreme, and engineered environments. Toward that end, we sought to understand the substrate oxidation pathways, the electron transport mechanisms, and the modes of energy conservation employed during respiration by bacteria on soluble iron and insoluble sulfide minerals. In accordance with these general aims, the specific aims were two-fold: To identify, separate, and characterize the extracellular biomolecules necessary for aerobic respiration on iron under strongly acidic conditions; and to elucidate the molecular principles whereby these bacteria recognize and adhere to their insoluble mineral substrates under harsh environmental conditions. The results of these studies were described in a total of nineteen manuscripts. Highlights include the following: 1. The complete genome of Acidithiobacillus ferrooxidans ATCC 23270 (type strain) was sequenced in collaboration with the DOE Joint Genome Institute; 2. Genomic and mass spectrometry-based proteomic methods were used to evaluate gene expression and in situ microbial activity in a low-complexity natural acid mine drainage microbial biofilm community. This was the first effort to successfully …
Date:
April 26, 2013
Creator:
Blake, Robert C.
Object Type:
Report
System:
The UNT Digital Library
ADVANCED SIMULATION CAPABILITY FOR ENVIRONMENTAL MANAGEMENT- CURRENT STATUS AND PHASE II DEMONSTRATION RESULTS
The U.S. Department of Energy (USDOE) Office of Environmental Management (EM), Office of Soil and Groundwater, is supporting development of the Advanced Simulation Capability for Environmental Management (ASCEM). ASCEM is a state-of-the-art scientific tool and approach for understanding and predicting contaminant fate and transport in natural and engineered systems. The modular and open source high-performance computing tool facilitates integrated approaches to modeling and site characterization that enable robust and standardized assessments of performance and risk for EM cleanup and closure activities. The ASCEM project continues to make significant progress in development of computer software capabilities with an emphasis on integration of capabilities in FY12. Capability development is occurring for both the Platform and Integrated Toolsets and High-Performance Computing (HPC) Multiprocess Simulator. The Platform capabilities provide the user interface and tools for end-to-end model development, starting with definition of the conceptual model, management of data for model input, model calibration and uncertainty analysis, and processing of model output, including visualization. The HPC capabilities target increased functionality of process model representations, toolsets for interaction with Platform, and verification and model confidence testing. The Platform and HPC capabilities are being tested and evaluated for EM applications in a set of demonstrations as part …
Date:
February 26, 2013
Creator:
Seitz, R.
Object Type:
Article
System:
The UNT Digital Library
Electrohydraulic Forming of Near-Net Shape Automotive Panels
The objective of this project was to develop the electrohydraulic forming (EHF) process as a near-net shape automotive panel manufacturing technology that simultaneously reduces the energy embedded in vehicles and the energy consumed while producing automotive structures. Pulsed pressure is created via a shockwave generated by the discharge of high voltage capacitors through a pair of electrodes in a liquid-filled chamber. The shockwave in the liquid initiated by the expansion of the plasma channel formed between two electrodes propagates towards the blank and causes the blank to be deformed into a one-sided die cavity. The numerical model of the EHF process was validated experimentally and was successfully applied to the design of the electrode system and to a multi-electrode EHF chamber for full scale validation of the process. The numerical model was able to predict stresses in the dies during pulsed forming and was validated by the experimental study of the die insert failure mode for corner filling operations. The electrohydraulic forming process and its major subsystems, including durable electrodes, an EHF chamber, a water/air management system, a pulse generator and integrated process controls, were validated to be capable to operate in a fully automated, computer controlled mode for forming …
Date:
September 26, 2013
Creator:
Golovaschenko, Sergey F.
Object Type:
Report
System:
The UNT Digital Library
Glass Frit Clumping And Dusting
DWPF mixes a slurry of glass frit (Frit 418) and dilute (1.5 wt%) formic acid solution with high level waste in the Slurry Mix Evaporator (SME). There would be advantages to introducing the frit in a non-slurry form to minimize water addition to the SME, however, adding completely dry frit has the potential to generate dust which could clog filters or condensers. Prior testing with another type of frit, Frit 320, and using a minimal amount of water reduced dust generation, however, the formation of hard clumps was observed. To examine options and behavior, a TTQAP [McCabe and Stone, 2013] was written to initiate tests that would address these concerns. Tests were conducted with four types of glass frit; Frit 320, DWPF Frit 418, Bekeson Frit 418 and Multi-Aspirator Frit 418. The last two frits are chemically identical to DWPF Frit 418 but smaller particles were removed by the respective vendors. Test results on Frit Clumping and Dusting are provided in this report. This report addresses the following seven questions. Short answers are provided below with more detailed answers to follow. 1. Will the addition of a small amount of water, 1.5 wt%, to dry DWPF Frit 418 greatly reduce …
Date:
September 26, 2013
Creator:
Steimke, J. L.
Object Type:
Report
System:
The UNT Digital Library
Comparing Medicaid and Exchanges: Benefits and Costs for Individuals and Families
This report provides an analysis of some of the key similarities and differences between Medicaid and insurance plan structure in plans offered through exchanges.It provides an insight into the complexities and issues when comparing beneficiary benefits and costs to individuals for Medicaid and the exchanges.
Date:
June 26, 2013
Creator:
Baumrucker, Evelyne P. & Fernandez, Bernadette
Object Type:
Report
System:
The UNT Digital Library
Everglades Restoration: Federal Funding and Implementation Progress
This report provides information on federal on federal appropriations for Everglades restoration and provides a brief summary of accomplishments and potential challenges for Everglades restoration.
Date:
February 26, 2013
Creator:
Stern, Charles V.
Object Type:
Report
System:
The UNT Digital Library
House Committee Hearings: The “Minority Witness Rule”
This report contains information about the origin of the minority witness rule.
Date:
March 26, 2013
Creator:
Davis, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
The Administrative Process by Which Groups May Be Acknowledged as Indian Tribes by the Department of the Interior
This report describes the history of the process by which Native American tribes have been recognized. Moreover, the report emphasizes the importance of being recognized and acknowledged to maintain a political existence. The benefits of having this include things such as having the ability to exercise jurisdiction over territory.
Date:
April 26, 2013
Creator:
Smith, Jane M.
Object Type:
Report
System:
The UNT Digital Library
Cloture Attempts on Nominations: Data and Historical Development
This report is on Cloture Attempts on Nominations: Data and Historical Development.
Date:
June 26, 2013
Creator:
Beth, Rechard, S.
Object Type:
Report
System:
The UNT Digital Library
Medicare Durable Medical Equipment: The Competitive Bidding Program
None
Date:
June 26, 2013
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Covered Bonds: Background and Policy Issues
The report is categorized into six categories: (I) Congressional Interest, (II) Definition, (III) Policy Issues, (IV) Agency Actions on Covered Bonds, (V) Performance in Europe During the Financial Crisis, and (VI) Legislation in Prior Congress: United States Covered Bond Act of 2011.
Date:
April 26, 2013
Creator:
Murphy, Edward V.
Object Type:
Report
System:
The UNT Digital Library
House Committee Hearings: Scheduling and Notification
This report provides an overview of the scheduling and notification of the House Committee hearings.
Date:
March 26, 2013
Creator:
Davis, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
Leaving Congress: House of Representatives and Senate Departures Data Since 1989. June 2013
This report provides data on those Members who have announced an intention to retire at the completion of the 113th Congress (2013-2014)
Date:
June 26, 2013
Creator:
Manning, Jennifer E. & Petersen, Eric R.
Object Type:
Report
System:
The UNT Digital Library
Reauthorizing the Secure Rural Schools and Community Self-Determination Act of 2000
None
Date:
February 26, 2013
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Defect Engineering, Cell Processing, and Modeling for High-Performance, Low-Cost Crystalline Silicon Photovoltaics
The objective of this project is to close the efficiency gap between industrial multicrystalline silicon (mc-Si) and monocrystalline silicon solar cells, while preserving the economic advantage of low-cost, high-volume substrates inherent to mc-Si. Over the course of this project, we made significant progress toward this goal, as evidenced by the evolution in solar-cell efficiencies. While most of the benefits of university projects are diffuse in nature, several unique contributions can be traced to this project, including the development of novel characterization methods, defect-simulation tools, and novel solar-cell processing approaches mitigate the effects of iron impurities ("Impurities to Efficiency" simulator) and dislocations. In collaboration with our industrial partners, this project contributed to the development of cell processing recipes, specialty materials, and equipment that increased cell efficiencies overall (not just multicrystalline silicon). Additionally, several students and postdocs who were either partially or fully engaged in this project (as evidenced by the publication record) are currently in the PV industry, with others to follow.
Date:
February 26, 2013
Creator:
Buonassisi, Tonio
Object Type:
Report
System:
The UNT Digital Library
Weld Repair of a Stamped Pressure Vessel in a Radiologically Controlled Zone
In September 2012 an ASME B&PVC Section VIII stamped pressure vessel located at the DOE Hanford Site Effluent Treatment Facility (ETF) developed a through-wall leak. The vessel, a steam/brine heat exchanger, operated in a radiologically controlled zone (by the CH2MHill PRC or CHPRC), had been in service for approximately 17 years. The heat exchanger is part of a single train evaporator process and its failure caused the entire system to be shut down, significantly impacting facility operations. This paper describes the activities associated with failure characterization, technical decision making/planning for repair by welding, logistical challenges associated with performing work in a radiologically controlled zone, performing the repair, and administrative considerations related to ASME code requirements.
Date:
August 26, 2013
Creator:
Cannell, Gary L.; Huth, Ralph J. & Hallum, Randall T.
Object Type:
Article
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 32, No. 17, Ed. 1 Sunday, May 26, 2013
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2013
Creator:
Mann, Rick
Object Type:
Newspaper
System:
The Portal to Texas History
Ensemble: 2013-09-26 – Symphonic Band
Access:
Use of this item is restricted to the UNT Community
Symphonic Band concert presented at the Festival Brasiliero 2013 at Winspear Hall, Murchinson Performing Arts Center
Date:
September 26, 2013
Creator:
University of North Texas. Symphonic Band.
Object Type:
Sound
System:
The UNT Digital Library
Ensemble: 2013-09-26 – Symphonic Band
Access:
Use of this item is restricted to the UNT Community
Symphonic Band concert performed at the UNT College of Music Winspear Hall.
Date:
September 26, 2013
Creator:
University of North Texas. Symphonic Band.
Object Type:
Video
System:
The UNT Digital Library