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Developing an MNA Modeling Tool Based on RT3D: 3 Reports
Integral to the accept of MNA and EA as part of a remediation system is documenting the sustainability of the attenuation mechanisms. As many sites are located in complex hydrogeologic settings, documentation of sustainability will require the use of complex models that have the capabilities to mathematically represent the various attenuation mechanisms. To address this need a team of researchers developed specific reaction modules for complex chlorinated solvent reactions that occur in subsurface. These reaction modules support the RT3D model.
Date:
October 11, 2006
Creator:
Vangelas, K; Brian02 Looney, B; Johnson, Christian D.; Truex, Michael J. & Clement, T. Prabhakar
Object Type:
Report
System:
The UNT Digital Library
Nanobiogeochemistry of Microbe/Mineral Interactions: A Force Microscopy and Bioinformatics Approach
Iron-reducing microorganisms, like Shewanella oneidensis, have received a great deal of attention in the literature because of their ability to couple the oxidation of organic contaminants to the reduction of Fe(III) in minerals. The mechanism by which this microorganism transfers electrons to Fe(III) in a mineral’s structure is unknown. We used atomic force microscopy (AFM) to measure forces at the interface between an iron oxide mineral and a living cell of S. oneidensis. A unique force-signature was attributed to outer membrane proteins synthesized for the specific purpose of forming a bond with the surface of an iron oxide. To confirm this hypothesis, we used AFM to measure forces between an iron oxide mineral and each of two outer membrane cytochromes purified from S. oneidensis. There is a strong correlation between the whole cell and pure protein force spectra suggesting that these two cytochromes play a prominent role in the terminal electron transfer to Fe(III) in minerals.
Date:
October 11, 2006
Creator:
Lower, Steven, K.
Object Type:
Report
System:
The UNT Digital Library
Simulating Dark Current in NLC Structures
Dark current generation and capture are of great importance in high gradient accelerating structure R&D especially for the NLC which aims to operate at 65 MV/m with specific limits on dark current and RF breakdown rates. Although considerable effort has been devoted to building and testing various types of structures to meet these requirements, few theoretical studies have been done to understand these effects in actual structures. This paper focuses on the simulation of dark current in a NLC test structure for which experimental data are available. The parallel time-domain field solver Tau3P and the parallel particle tracking code Track3P are used together to simulate, for the first time, a dark current pulse to compare with the data measured downstream. Results from SLAC X-band 30-cell constant impedance structure for RF drive pulses with different rise times are presented and discussed.
Date:
October 11, 2007
Creator:
Ng, C. K.; Folwell, N.; Guetz, A.; Ivanov, V.; Lee, L. Q.; Li, Z. H. et al.
Object Type:
Article
System:
The UNT Digital Library
An Analytical Modeling Method for Calculating the Current Delivery Capacity of a Thin-Film Cathode and the Stability of Localized Corrosion Under Atmospheric Environemnts
Corrosion resistant materials under atmospheric conditions can suffer from localized corrosion (e.g., pitting, crevice, stress-corrosion cracking). The stability of such a localized corrosion site requires that the site (anode) must dissolve at a sufficiently high rate to maintain the critical chemistry and that it be coupled to a wetted surrounding area (cathode) that can provide a matching cathodic current. The objectives of this study were to computationally characterize the stability of such a local corrosion system and to explore the effects of physiochemical and electrochemical parameters. The overall goal of the work is to contribute to the establishment of a scientific basis for the prediction of the stabilization of localized attack. An analytical method is presented for evaluating the stability of localized corrosion of corrosion-resistant alloys under thin-layer (or atmospheric) conditions. The method requires input data that are either thermodynamic in nature or easily obtained experimentally. The maximum cathode current available depends on the cathode geometry, temperature, relative humidity, deposition density of salt (i.e., mass of salt per unit area of cathode), and interfacial electrochemical kinetics. The anode demand depends on the crevice geometry, the position of attack within the crevice, and the localized corrosion stability product. The localized corrosion …
Date:
October 11, 2006
Creator:
Chen, Z.Y. & Kelly, R.G.
Object Type:
Report
System:
The UNT Digital Library
Analysis Methods for Milky Way Dark Matter Halo Detection
We present methods for the analysis of dark matter annihilation in the smooth halo of the Milky Way galaxy. We model the diffuse gamma-ray background using GALPROP, and model the halo using an NFW profile and the gamma-ray spectrum for WIMP pair annihilation. We plan to combine these models with the point source catalog and a simple model for the extragalactic gamma ray background. Using the downhill simplex method to converge on the maximum likelihood value, we can vary key parameters in these models and fit them to the gamma-ray data. Through the use of the Markov Chain Monte Carlo (MCMC) method we can then map out the likelihood as a function of the model parameters to estimate the correlated errors on these parameters.
Date:
October 11, 2007
Creator:
Sander, Aaron; Winer, Brian; Hughes, Richard; U., /Ohio State; Wai, Larry; /KIPAC, Menlo Park et al.
Object Type:
Article
System:
The UNT Digital Library
Integrated Laser-Target Interaction Experiments on the RAL Petawatt Laser
Since the construction of the first Petawatt laser on the Nova laser facility at Lawrence Livermore National Laboratory we are witnessing the emergence of similar Petawatt-class laser systems at laboratories all around the world. This new generation of lasers, able to deliver several hundred joules of energy in a sub-picosecond pulse, has enabled a host of new discoveries to be made and continues to provide a valuable tool to explore new regimes in relativistic laser-plasma physics--encompassing high energy X-rays and -rays, relativistic electrons, intense ion beams, and superstrong magnetic fields. The coupling in the near-future of multi-kiloJoule Petawatt-class lasers with large-scale fusion lasers.including the NIF and Omega EP (US), LIL (France), and FIREX (Japan)--will further expand opportunities in fast ignition, high energy X-ray radiography, and high energy density physics research. The 500 J Petawatt laser at the Rutherford Appleton Laboratory is currently the highest energy short-pulse laser in the world. In this paper we describe a recent experimental campaign carried out on the facility. The campaign, performed by a large collaborative team from eight different laboratories, was designed to study a variety of relativistic laser-interaction phenomena including laser absorption, fast electron transport, proton heating, and high-brightness x-ray generation. The wide …
Date:
October 11, 2006
Creator:
Patel, P. K.; Key, M. H.; Mackinnon, A. J.; Berry, R.; Borghesi, M.; Chambers, D. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Factors Influencing the Quality of Carbon Coatings onLiFePO4
Several LiFePO4/C composites were prepared and characterizedelectrochemically in lithium half-cells. Pressed pellet conductivitiescorrelated well with the electrochemical performance in lithiumhalf-cells. It was found that carbon structural factors such as sp2/sp3,D/G, and H/C ratios, as determined by Raman spectroscopy and elementalanalysis, influenced the conductivity and rate behavior strongly. Thestructure of the residual carbon could be manipulated through the use ofadditives during LiFePO4 synthesis. Increasing the pyromellitic acid (PA)content in the precursor mix prior to calcination resulted in asignificant lowering of the D/G ratio and a concomitant rise in thesp2/sp3 ratio of the carbon. Addition of both iron nitrate and PAresulted in higher sp2/sp3 ratios without further lowering the D/Gratios, or increasing carbon contents. The best electrochemical resultswere obtained for LiFePO4 processed with both ferrocene and PA. Theimprovement is attributed to better decomposition of the carbon sources,as evidenced by lower H/C ratios, a slight increase of the carbon content(still below 2 wt. percent), and more homogeneous coverage. A discussionof the influence of carbon content vs. structural factors on thecomposite conductivities and, by inference, the electrochemicalperformance, is included.
Date:
October 11, 2006
Creator:
Wilcox, James D.; Doeff, Marca M.; Marcinek, Marek & Kostecki,Robert
Object Type:
Article
System:
The UNT Digital Library
A Modeling Study Evaluating the Thermal-Hydrological Conditions In and Near Waste Emplacement Tunnels At Yucca Mountain
In heated tunnels such as those designated for emplacement of radioactive waste at the proposed geologic repository at Yucca Mountain, temperature gradients cause natural convection processes that may significantly influence the moisture conditions in the tunnels and in the surrounding fractured rock. Large-scale convection cells in the heated tunnels would provide an effective mechanism for turbulent mixing and axial transport of vapor generated from evaporation of pore water in the nearby formation. As a result, vapor would be transported from the elevated-temperature sections of the tunnels into cool end sections (where no waste is emplaced), would condense there, and subsequently drain into underlying rock units. To study these processes, we have developed a new simulation method that couples existing tools for simulating thermal-hydrological (TH) conditions in the fractured formation with a module that approximates turbulent natural convection in heated emplacement drifts. The new method simultaneously handles (1) the flow and energy transport processes in the fractured rock, (2) the flow and energy transport processes in the cavity, and (3) the heat and mass exchange at the rock-cavity interface. An application is presented studying the future TH conditions within and near a representative waste emplacement tunnel at Yucca Mountain. Particular focus …
Date:
October 11, 2006
Creator:
Birkholzer, J.T.; Halecky, N.; Webb, S.W>; Peterson, P.F. & Bodvarsson, G.S.
Object Type:
Article
System:
The UNT Digital Library
Probing AGN Broad Line Regions With LAT Observations of FSRQs
The GLAST Large Area Telescope (LAT) is expected to detect gamma-ray emission from over a thousand active galaxies, many of which will be flat spectrum radio quasars (FSRQs). A commonly assumed ingredient of leptonic models of FRSQs is the contribution to the gamma-ray flux from external inverse-Compton (EIC) scattering of photons from the broad line region (BLR) material by relativistic electrons and positrons in the jet. Here we explore the effect of the BLR geometry on the high-energy emission from FSRQs.
Date:
October 11, 2007
Creator:
Carson, Jennifer E.; Chiang, James & Bottcher, Markus
Object Type:
Article
System:
The UNT Digital Library
Organics Captured from Comet Wild 2 by the Stardust Spacecraft
Organics found in Comet Wild 2 samples show a heterogeneous and unequilibrated distribution in abundance and composition. Some organics are similar, but not identical, to those in interplanetary dust particles (IDPs) and carbonaceous meteorites. A class of aromatic-poor organic material is also present. The organics are rich in O and N compared to meteoritic organics. Aromatic compounds are present, but the samples tend to be relatively poorer in aromatics than meteorites and IDPs. D and {sup 15}N suggest that some organics have an interstellar/protostellar heritage. While the variable extent of modification of these materials by impact capture is not yet fully constrained, a remarkably diverse suite of organic compounds is present and identifiable within the returned samples. Comets are small bodies that accreted in the outer Solar System during its formation (1) and thus may consist of preserved samples of the ''starting materials'' from which the Solar System was made. Organic materials are expected to be present in cometary samples (2) and may include molecules made and/or modified in stellar outflows, the interstellar medium, and the protosolar nebula, as well as by parent body processing within the comet. The presence of organic compounds in comets and their ejecta is of …
Date:
October 11, 2006
Creator:
Stanford, S. A.; Aleon, J.; O'D, C. M.; Araki, T.; Bajt, S.; Baratta, G. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Sludge Batch 4 Baseline Melt Rate Furnace and Slurry-Fed Melt Rate Furnace Tests With Frits 418 and 510 (U)
Several Slurry-Fed Melt Rate Furnace (SMRF) tests with earlier projections of the Sludge Batch 4 (SB4) composition have been performed.1,2 The first SB4 SMRF test used Frits 418 and 320, however it was found after the test that the REDuction/OXidation (REDOX) correlation at that time did not have the proper oxidation state for manganese. Because the manganese level in the SB4 sludge was higher than previous sludge batches tested, the impact of the higher manganese oxidation state was greater. The glasses were highly oxidized and very foamy, and therefore the results were inconclusive. After resolving this REDOX issue, Frits 418, 425, and 503 were tested in the SMRF with the updated baseline SB4 projection. Based on dry-fed Melt Rate Furnace (MRF) tests and the above mentioned SMRF tests, two previous frit recommendations were made by the Savannah River National Laboratory (SRNL) for processing of SB4 in the Defense Waste Processing Facility (DWPF). The first was Frit 503 based on the June 2006 composition projections.3 The recommendation was changed to Frit 418 as a result of the October 2006 composition projections (after the Tank 40 decant was implemented as part of the preparation plan). However, the start of SB4 processing was …
Date:
October 11, 2007
Creator:
Smith, M.; Timothy Jones, T. & Donald02 Miller, D.
Object Type:
Report
System:
The UNT Digital Library
Nanotechnology-Based Systems for Nuclear Radiation and Chemicl Detection
This main objectives of this effort are the development and prototyping of a small. sensitive, and low-cost multi-channel nanoparticle scintillation microdevice with integrated waveguides for alpha, beta, gamma, and neutron detection. This research effort has integrated experiments and simulation to determine the combination of process-specific materials for the achievement optimum detection conditions.
Date:
October 11, 2006
Creator:
Varahramyan, Kody; Derosa, Pedro & Wilson, Chester
Object Type:
Report
System:
The UNT Digital Library
PM Motor Parametric Design Analyses for a Hybrid Electric Vehicle Traction Drive Application
The Department of Energy's (DOE) Office of FreedomCAR (Cooperative Automotive Research) and Vehicle Technologies office has a strong interest in making rapid progress in permanent magnet (PM) machine development. The DOE FreedomCAR program is directing various technology development projects that will advance the technology and hopefully lead to a near-term request for proposals (RFP) for a to-be-determined level of initial production. This aggressive approach is possible because the technology is clearly within reach and the approach is deemed essential, based on strong market demand, escalating fuel prices, and competitive considerations. In response, this study began parallel development paths that included a literature search/review, development and utilization of multiple parametric models, verification of the modeling methodology, development of an interior PM (IPM) machine baseline design, development of alternative machine baseline designs, and cost analyses for several candidate machines. This report summarizes the results of these activities as of September 2004. This report provides background and summary information for recent machine parametric studies and testing programs that demonstrate both the potential capabilities and technical limitations of brushless PM machines (axial gap and radial gap), the IPM machine, the surface-mount PM machines (interior or exterior rotor), induction machines, and switched-reluctance machines. The FreedomCAR …
Date:
October 11, 2004
Creator:
Staunton, R.H.
Object Type:
Report
System:
The UNT Digital Library
Measurement of Direct CP Asymmetries in Charmless Hadronic B Decays
We present recent results on time integrated and time dependent CP violation for charmless hadronic B decays using BABAR detector at the PEP-II B-factory.
Date:
October 11, 2006
Creator:
Di Marco, Emanuele
Object Type:
Article
System:
The UNT Digital Library
CP Violation Measurements in B to Charm Decays at BaBar
This article summarizes measurements of time-dependent CP asymmetries in decays of neutral B mesons to charm final states using data collected by the BABAR detector at the PEP-II asymmetric-energy B factory. All results are preliminary unless otherwise stated.
Date:
October 11, 2006
Creator:
George, Katherine A.
Object Type:
Article
System:
The UNT Digital Library
TECHNICAL REPORT
Because this DOE grant was abruptly terminated without warning, this group was not able to accomplish the insertion of the biosensor genes into the mouse lines. They have been able to generate some of the mouse lines but have not been able to complete the ones that would give them the model systems that would allow them to investigate metastasis real-time in living tumors at the cellular level. Nonetheless, until the loss of funding, they have made progress in applications of the equipment to biological problems involving RNA and protein movement in living cells. The following products were delivered: (1) Imaging of gene expression in living cells and tissues, Singer RH, Lawrence DS, Ovryn B, Condeelis J, J Biomed Optics 10:0514061-0514069, 2005. This paper describes the method for activating single genes within cells and tissues. (2) Single Cell Gene Expression Profiling: Multiplexed Expression Fluorescence in situ Hybridization (FISH): Application to the Analysis of Cultured Cells. Levsky JM, Braut SA, Singer RH, Cell Biology: A Laboratory Handbook Volume 4, eds Celis JE, et al, 121-130. Academic Press, 2005. This paper describes the methodology for single cell expression profiling in tissues. (3) Spatial regulation of beta-actin translation by Src-dependent phosphorylation of ZBP1, …
Date:
October 11, 2007
Creator:
SINGER, DR. ROBERT
Object Type:
Report
System:
The UNT Digital Library
LCLS XTOD Fixed Mask
None
Date:
October 11, 2006
Creator:
Duffy, P & Fong, K
Object Type:
Report
System:
The UNT Digital Library
The Wylie News (Wylie, Tex.), Vol. 59, No. 21, Ed. 1 Wednesday, October 11, 2006
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
October 11, 2006
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 98, No. 1, Ed. 1 Wednesday, October 11, 2006
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 11, 2006
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 41, Ed. 1 Thursday, October 11, 2007
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
October 11, 2007
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 93, No. 103, Ed. 1 Wednesday, October 11, 2000
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
October 11, 2000
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with Charles M. Lagow, October 11, 2000
Access:
Use of this item is restricted to the UNT Community
Interview with Charles M. Lagow, a Army WWII veteran from Dallas, Texas. Lagow discusses his family history, attending Texas A&M, joining the CCC, the lead up to war, activation and training with the 352nd Engineer Battalion, deployment to Khorramshahr, Iran, building roads, delivering supplies to the Soviets, crash landing in a B-17 in Palestine, returning to the States and transfer to the 1346th Eng. Bat., deployment to Okinawa, occupation duty and Japanese holdouts, thoughts on Hideki Tojo, attitudes towards the Japanese, shell shock and mental breakdowns, the atomic bomb, and life after the war.
Date:
October 11, 2000
Creator:
Ripley, Christopher & Lagow, Charles Marshall
Object Type:
Book
System:
The UNT Digital Library
Lexington Observer (Lexington, Okla.), Vol. 12, No. 26, Ed. 1 Thursday, October 11, 2007
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 11, 2007
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Mount Vernon Optic-Herald (Mount Vernon, Tex.), Vol. 127, No. 10, Ed. 1 Thursday, October 11, 2001
Weekly newspaper from Mount Vernon, Texas that includes local, state, and national news along with advertising.
Date:
October 11, 2001
Creator:
Bush-Reves, Lillie
Object Type:
Newspaper
System:
The Portal to Texas History