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Predictive Science Panel Unclassified Report, LLNL Meeting
None
Date:
September 12, 2013
Creator:
Adams, M
System:
The UNT Digital Library
Incorporating Cold Cap Behavior in a Joule-heated Waste Glass Melter Model
In this paper, an overview of Joule-heated waste glass melters used in the vitrification of high level waste (HLW) is presented, with a focus on the cold cap region. This region, in which feed-to-glass conversion reactions occur, is critical in determining the melting properties of any given glass melter. An existing 1D computer model of the cold cap, implemented in MATLAB, is described in detail. This model is a standalone model that calculates cold cap properties based on boundary conditions at the top and bottom of the cold cap. Efforts to couple this cold cap model with a 3D STAR-CCM+ model of a Joule-heated melter are then described. The coupling is being implemented in ModelCenter, a software integration tool. The ultimate goal of this model is to guide the specification of melter parameters that optimize glass quality and production rate.
Date:
August 1, 2013
Creator:
Agarwal, Varija & Guillen, Donna Post
System:
The UNT Digital Library
Multiphysics Integrated Coupling Environment (MICE) User Manual
The complex, multi-part nature of waste glass melters used in nuclear waste vitrification poses significant modeling challenges. The focus of this project has been to couple a 1D MATLAB model of the cold cap region within a melter with a 3D STAR-CCM+ model of the melter itself. The Multiphysics Integrated Coupling Environment (MICE) has been developed to create a cohesive simulation of a waste glass melter that accurately represents the cold cap. The one-dimensional mathematical model of the cold cap uses material properties, axial heat, and mass fluxes to obtain a temperature profile for the cold cap, the region where feed-to-glass conversion occurs. The results from Matlab are used to update simulation data in the three-dimensional STAR-CCM+ model so that the cold cap is appropriately incorporated into the 3D simulation. The two processes are linked through ModelCenter integration software using time steps that are specified for each process. Data is to be exchanged circularly between the two models, as the inputs and outputs of each model depend on the other.
Date:
August 1, 2013
Creator:
Agarwal, Varija & Guillen, Donna Post
System:
The UNT Digital Library
Light Water Reactor Sustainability Program Demonst
The online monitoring of active components project
Date:
September 1, 2013
Creator:
Agarwal, Vivek; Lybeck, Nancy J. & Matacia, Laura C.
System:
The UNT Digital Library
Simulation information regarding Sandia National Laboratories%3CU%2B2019%3E trinity capability improvement metric.
Sandia National Laboratories, Los Alamos National Laboratory, and Lawrence Livermore National Laboratory each selected a representative simulation code to be used as a performance benchmark for the Trinity Capability Improvement Metric. Sandia selected SIERRA Low Mach Module: Nalu, which is a uid dynamics code that solves many variable-density, acoustically incompressible problems of interest spanning from laminar to turbulent ow regimes, since it is fairly representative of implicit codes that have been developed under ASC. The simulations for this metric were performed on the Cielo Cray XE6 platform during dedicated application time and the chosen case utilized 131,072 Cielo cores to perform a canonical turbulent open jet simulation within an approximately 9-billion-elementunstructured- hexahedral computational mesh. This report will document some of the results from these simulations as well as provide instructions to perform these simulations for comparison.
Date:
October 1, 2013
Creator:
Agelastos, Anthony Michael & Lin, Paul T.
System:
The UNT Digital Library
Effect Of Changing Driving Conditions On Driver Behavior Towards Design Of A Safe And Efficient Traffic System
A report on driver behavior, satisfaction, and speed in Conventional Lane Merges versus Joint Lane Merges.
Date:
December 2013
Creator:
Aghazadeh, Fereydoun; Ikuma, Laura Hughes & Ishak, Sherif
System:
The Portal to Texas History
Final Report
This grant resulted in three distinct scientific advances, the most important being the discovery of a inhomogeneous superconducting state first predicted over 40 years ago. Two graduate students received PhDs as a result of this grant, and a major US high magnetic field facility was rebuilt.
Date:
June 14, 2013
Creator:
Agosta, Charles C.
System:
The UNT Digital Library
New Design Methods And Algorithms For High Energy-Efficient And Low-cost Distillation Processes
This project sought and successfully answered two big challenges facing the creation of low-energy, cost-effective, zeotropic multi-component distillation processes: first, identification of an efficient search space that includes all the useful distillation configurations and no undesired configurations; second, development of an algorithm to search the space efficiently and generate an array of low-energy options for industrial multi-component mixtures. Such mixtures are found in large-scale chemical and petroleum plants. Commercialization of our results was addressed by building a user interface allowing practical application of our methods for industrial problems by anyone with basic knowledge of distillation for a given problem. We also provided our algorithm to a major U.S. Chemical Company for use by the practitioners. The successful execution of this program has provided methods and algorithms at the disposal of process engineers to readily generate low-energy solutions for a large class of multicomponent distillation problems in a typical chemical and petrochemical plant. In a petrochemical complex, the distillation trains within crude oil processing, hydrotreating units containing alkylation, isomerization, reformer, LPG (liquefied petroleum gas) and NGL (natural gas liquids) processing units can benefit from our results. Effluents from naphtha crackers and ethane-propane crackers typically contain mixtures of methane, ethylene, ethane, propylene, …
Date:
November 21, 2013
Creator:
Agrawal, Rakesh
System:
The UNT Digital Library
Monte Carlo Simulation Tool Installation and Operation Guide
This document provides information on software and procedures for Monte Carlo simulations based on the Geant4 toolkit, the ROOT data analysis software and the CRY cosmic ray library. These tools have been chosen for its application to shield design and activation studies as part of the simulation task for the Majorana Collaboration. This document includes instructions for installation, operation and modification of the simulation code in a high cyber-security computing environment, such as the Pacific Northwest National Laboratory network. It is intended as a living document, and will be periodically updated. It is a starting point for information collection by an experimenter, and is not the definitive source. Users should consult with one of the authors for guidance on how to find the most current information for their needs.
Date:
September 2, 2013
Creator:
Aguayo Navarrete, Estanislao; Ankney, Austin S.; Berguson, Timothy J.; Kouzes, Richard T.; Orrell, John L.; Troy, Meredith D. et al.
System:
The UNT Digital Library
Ship Effect Neutron Measurements And Impacts On Low-Background Experiments
The primary particles entering the upper atmosphere as cosmic rays create showers in the atmosphere that include a broad spectrum of secondary neutrons, muons and protons. These cosmic-ray secondaries interact with materials at the surface of the Earth, yielding prompt backgrounds in radiation detection systems, as well as inducing long-lived activities through spallation events, dominated by the higher-energy neutron secondaries. For historical reasons, the multiple neutrons produced in spallation cascade events are referred to as “ship effect” neutrons. Quantifying the background from cosmic ray induced activities is important to low-background experiments, such as neutrino-less double beta decay. Since direct measurements of the effects of shielding on the cosmic-ray neutron spectrum are not available, Monte Carlo modeling is used to compute such effects. However, there are large uncertainties (orders of magnitude) in the possible cross-section libraries and the cosmic-ray neutron spectrum for the energy range needed in such calculations. The measurements reported here were initiated to validate results from Monte Carlo models through experimental measurements in order to provide some confidence in the model results. The results indicate that the models provide the correct trends of neutron production with increasing density, but there is substantial disagreement between the model and experimental …
Date:
October 1, 2013
Creator:
Aguayo Navarrete, Estanislao; Kouzes, Richard T. & Siciliano, Edward R.
System:
The UNT Digital Library
Test Cell C Shielding Study Kiwi B4D-202
None
Date:
July 3, 2013
Creator:
Ahlquist, A. John & Dummer, Jerome E
System:
The UNT Digital Library
Materials Inventory Database for the Light Water Reactor Sustainability Program
Scientific research involves the purchasing, processing, characterization, and fabrication of many sample materials. The history of such materials can become complicated over their lifetime – materials might be cut into pieces or moved to various storage locations, for example. A database with built-in functions to track these kinds of processes facilitates well-organized research. The Material Inventory Database Accounting System (MIDAS) is an easy-to-use tracking and reference system for such items. The Light Water Reactor Sustainability Program (LWRS), which seeks to advance the long-term reliability and productivity of existing nuclear reactors in the United States through multiple research pathways, proposed MIDAS as an efficient way to organize and track all items used in its research. The database software ensures traceability of all items used in research using built-in functions which can emulate actions on tracked items – fabrication, processing, splitting, and more – by performing operations on the data. MIDAS can recover and display the complete history of any item as a simple report. To ensure the database functions suitably for the organization of research, it was developed alongside a specific experiment to test accident tolerant nuclear fuel cladding under the LWRS Advanced Light Water Reactor Nuclear Fuels Pathway. MIDAS kept …
Date:
August 1, 2013
Creator:
Ahmed, Kazi & Bragg-Sitton, Shannon M.
System:
The UNT Digital Library
Stationary Fuel Cell System Composite Data Products: Data Through Quarter 4 of 2012
This presentation from the U.S. Department of Energy's National Renewable Energy Laboratory includes stationary fuel cell system composite data products for data through the fourth quarter of 2012.
Date:
May 1, 2013
Creator:
Ainscough, C.; Kurtz, J. & Saur, G.
System:
The UNT Digital Library
Stationary Fuel Cell System Composite Data Products: Data through Quarter 2 of 2013
This report includes 24 composite data products (CDPs) produced for stationary fuel cell systems, with data through the second quarter of 2013.
Date:
November 1, 2013
Creator:
Ainscough, C.; Kurtz, J.; Peters, M. & Saur, G.
System:
The UNT Digital Library
The Overseas Private Investment Corporation: Background and Legislative Issues
This report provides: (1) a background on Overseas Private Investment Corporation (OPIC) origins and program operations; (2) discussion of the international development finance context; and (3) analysis of key issues for Congress related to OPIC.
Date:
September 25, 2013
Creator:
Akhtar, Shayerah I.
System:
The UNT Digital Library
Trade Reorganization: Overview and Issues for Congress
Report that discusses: President Obama's trade reorganization proposal; the context of the trade reorganization debate; key issues that Congress may face related to the debate; potential policy options for Congress; and the outlook for trade reorganization.
Date:
June 6, 2013
Creator:
Akhtar, Shayerah Ilias
System:
The UNT Digital Library
Proposed Transatlantic Trade and Investment Partnership (TTIP): In Brief
Report that discusses the Transatlantic Trade and Investment Partnership (TTIP), that is a proposed free trade agreement (FTA) being negotiated between the United States and the European Union (EU).
Date:
July 23, 2013
Creator:
Akhtar, Shayerah Ilias & Jones, Vivian C.
System:
The UNT Digital Library
U.S. International Investment Agreements: Issues for Congress
This report provides an overview of U.S. international investment agreements, focusing specifically on bilateral investment treaties (BITs) and investment chapters in free trade agreements (FTAs). It discusses key trends in U.S. and international investment flows, governance structures for investment at the bilateral and multilateral levels, the goals and basic components of investment provisions in U.S. international investment agreements, the outcomes of the Administration's Model BIT review, and key policy issues for Congress.
Date:
April 29, 2013
Creator:
Akhtar, Shayerah Ilias & Weiss, Martin A.
System:
The UNT Digital Library
U.S. Trade and Investment in the Middle East and North Africa: Overview and Issues for Congress
This report provides background and analysis for policymakers considering re-evaluating U.S. trade and investment in the Middle East and North Africa (MENA) region in light of recent political developments. In particular, the report examines the economic challenges facing many countries in the region and the area's limited integration in the world economy, including relatively weak economic ties with the United States. It also analyzes various policy options for increasing trade and investment with MENA countries. The report concludes by discussing: 1) the premise of the policy agenda, specifically whether increased trade and investment can support or lead to successful democratic transitions and political stability; and 2) if such a policy agenda is pursued, possible implementation questions that policymakers in Congress and the Administration may face.
Date:
March 4, 2013
Creator:
Akhtar, Shayerah Ilias; Bolle, Mary Jane & Nelson, Rebecca M.
System:
The UNT Digital Library
Handling and characterization of glow-discharge polymer samples for the light gas gun
None
Date:
September 6, 2013
Creator:
Akin, M. C.; Chau, R.; Jenei, Z.; Lipp, M. J. & Evans, W. J.
System:
The UNT Digital Library
Scale-Up of CdTe Photovoltaic Device Processes for Commercial Application: Cooperative Research and Development Final Report, CRADA Number CRD-06-196
Through this Cooperative Research and Development Agreement, NREL and PrimeStar Solar will work together to scale up the NREL CdTe photovoltaic process from the laboratory to produce photovoltaic devices in a size that is commercially viable. The work in this phase will focus on the transference of NREL CdTe device fabrication techniques to PrimeStar Solar. NREL and PrimeStar Solar will engage in a series of technical exchange meetings and laboratory training sessions to transfer the knowledge of CdTe PV film growth from NREL to PrimeStar Solar. PrimeStar Solar will grow thin films on PrimeStar Solar equipment and interleave them with NREL-grown films in an effort to develop a commercial scale process on PrimeStar Solar equipment. Select NREL film growth equipment will be upgraded either by PrimeStar Solar or at PrimeStar Solar's expense to increase equipment reliability and throughput.
Date:
February 1, 2013
Creator:
Albin, D.
System:
The UNT Digital Library
Collaborative Research: ARM observations for the development and evaluation of models and parameterizations of cloudy boundary layers
This is a collaborative project with Dr. Ping Zhu at Florida International University. It was designed to address key issues regarding the treatment of boundary layer cloud processes in climate models with UM’s research focusing on the analyses of ARM cloud radar observations from MMCR and WACR and FIU’s research focusing on numerical simulations of boundary layer clouds. This project capitalized on recent advancements in the ARM Millimeter Cloud Radar (MMCR) processing and the development of the WACR (at the SGP) to provide high temporal and spatial resolution Doppler cloud radar measurements for characterizing in-cloud turbulence, large-eddy circulations, and high resolution cloud structures of direct relevance to high resolution numerical modeling studies. The principal focus of the observational component of this collaborative study during this funding period was on stratocumulus clouds over the SGP site and fair-weather cumuli over the Nauru site. The statistical descriptions of the vertical velocity structures in continental stratocumulus clouds and in the Nauru shallow cumuli that are part of this study represents the most comprehensive observations of the vertical velocities in boundary layer clouds to date and were done in collaboration with Drs. Virendra Ghate and Pavlos Kollias.
Date:
July 12, 2013
Creator:
Albrecht, Bruce
System:
The UNT Digital Library
Rh-Based Mixed Alcohol Synthesis Catalysts: Characterization and Computational Report
The U.S. Department of Energy is conducting a program focused on developing a process for the conversion of biomass to bio-based fuels and co-products. Biomass-derived syngas is converted thermochemically within a temperature range of 240 to 330°C and at elevated pressure (e.g., 1200 psig) over a catalyst. Ethanol is the desired reaction product, although other side compounds are produced, including C3 to C5 alcohols; higher (i.e., greater than C1) oxygenates such as methyl acetate, ethyl acetate, acetic acid and acetaldehyde; and higher hydrocarbon gases such as methane, ethane/ethene, propane/propene, etc. Saturated hydrocarbon gases (especially methane) are undesirable because they represent a diminished yield of carbon to the desired ethanol product and represent compounds that must be steam reformed at high energy cost to reproduce CO and H2. Ethanol produced by the thermochemical reaction of syngas could be separated and blended directly with gasoline to produce a liquid transportation fuel. Additionally, higher oxygenates and unsaturated hydrocarbon side products such as olefins also could be further processed to liquid fuels. The goal of the current project is the development of a Rh-based catalyst with high activity and selectivity to C2+ oxygenates. This report chronicles an effort to characterize numerous supports and catalysts …
Date:
August 1, 2013
Creator:
Albrecht, Karl O.; Glezakou, Vassiliki Alexandra; Rousseau, Roger J.; Engelhard, Mark H.; Varga, Tamas; Colby, Robert J. et al.
System:
The UNT Digital Library
PSEC Fast Timing Test
None
Date:
June 17, 2013
Creator:
Albrow, Michael; Ramberg, Erik; Ronzhin, Anatoly; Ertley, Camden; Frsich, Henry; Genat, Jean-Francois et al.
System:
The UNT Digital Library