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Elucidating Bioreductive Transformations within Physically Complex Media: Impact on the Fate and Transport of Uranium and Chromium
In situ stabilization (inclusive of natural attenuation) of toxic metals and radionuclides is an attractive approach for remediating many contaminated DOE sites. By immobilizing toxic metals and radionuclides in place, the removal of contaminated water to the surface for treatment as well as the associated disposal costs are avoided. To enhance in situ remediaton, microbiological reductive stabilization of contaminant metals has been, and continues to be, actively explored. It is likely that surface and subsurface microbial activity can alter the redox state of toxic metals and radionuclides, either directly or indirectly, so they are rendered immobile. Furthermore, anaerobic bacterial metabolic products will help to buffer pulses of oxidation, typically from fluxes of nitrate or molecular oxygen, and thus may stabilize reduced contaminants from oxidative mobilization. Uranium and chromium are two elements of particular concern within the DOE complex that, owing to their abundance and toxicity, appear well suited for biologically mediated reductive stabilization. Subsurface microbial activity can alter the redox state of toxic metals and radionuclides, rending them immobile. Imparting an important criterion on the probability that contaminants will undergo reductive stabilization, however, is the chemical and physical heterogeneity of the media. Our research first examined microbially induced transformation of …
Date:
March 1, 2009
Creator:
Fendorf, Scott; Francis, Chris; Jardine, Phil & Benner, Shawn
Object Type:
Report
System:
The UNT Digital Library
Energy and water sector policy strategies for drought mitigation.
Tensions between the energy and water sectors occur when demand for electric power is high and water supply levels are low. There are several regions of the country, such as the western and southwestern states, where the confluence of energy and water is always strained due to population growth. However, for much of the country, this tension occurs at particular times of year (e.g., summer) or when a region is suffering from drought conditions. This report discusses prior work on the interdependencies between energy and water. It identifies the types of power plants that are most likely to be susceptible to water shortages, the regions of the country where this is most likely to occur, and policy options that can be applied in both the energy and water sectors to address the issue. The policy options are designed to be applied in the near term, applicable to all areas of the country, and to ease the tension between the energy and water sectors by addressing peak power demand or decreased water supply.
Date:
March 1, 2009
Creator:
Kelic, Andjelka; Vugrin, Eric D.; Loose, Verne W. & Vargas, Vanessa N.
Object Type:
Report
System:
The UNT Digital Library
[Equality for LGBT Texans Sticker]
An Equality for LGBT Texans sticker.
Date:
March 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Equality Justice Independence Booklet]
Equality Justice Independence booklet with information regarding Equality Texas.
Date:
March 2009
Creator:
unknown
Object Type:
Pamphlet
System:
The UNT Digital Library
[Equality Texas Brochure]
A brochure informing the public about the foundation, programs, legislative initiatives, volunteer, contributions and memberships, house parties, mission, and vision of Equality Texas.
Date:
March 2009
Creator:
unknown
Object Type:
Pamphlet
System:
The UNT Digital Library
[Equality Texas Elected Officials]
Representative Jim Jackson highlighted with contact information, capitol address, district address, legislative history, and committees information.
Date:
March 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Equality Texas Label]
Equality Texas label with website.
Date:
March 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Equality Texas Update Packet]
A brief packet containing a map and other information for the Equality Texas Lobby Day.
Date:
March 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Estimating IMU heading error from SAR images.
Angular orientation errors of the real antenna for Synthetic Aperture Radar (SAR) will manifest as undesired illumination gradients in SAR images. These gradients can be measured, and the pointing error can be calculated. This can be done for single images, but done more robustly using multi-image methods. Several methods are provided in this report. The pointing error can then be fed back to the navigation Kalman filter to correct for problematic heading (yaw) error drift. This can mitigate the need for uncomfortable and undesired IMU alignment maneuvers such as S-turns.
Date:
March 1, 2009
Creator:
Doerry, Armin Walter
Object Type:
Report
System:
The UNT Digital Library
EVALUATING THE SENSITIVITY OF RADIONUCLIDE DETECTORS FOR CONDUCTING A MARITIME ON-BOARD SEARCH USING MONTE CARLO SIMULATION IMPLEMENTED IN AVERT
The sensitivity of two specific types of radionuclide detectors for conducting an on-board search in the maritime environment was evaluated using Monte Carlo simulation implemented in AVERT{reg_sign}. AVERT{reg_sign}, short for the Automated Vulnerability Evaluation for Risk of Terrorism, is personal computer based vulnerability assessment software developed by the ARES Corporation. The sensitivity of two specific types of radionuclide detectors for conducting an on-board search in the maritime environment was evaluated using Monte Carlo simulation. The detectors, a RadPack and also a Personal Radiation Detector (PRD), were chosen from the class of Human Portable Radiation Detection Systems (HPRDS). Human Portable Radiation Detection Systems (HPRDS) serve multiple purposes. In the maritime environment, there is a need to detect, localize, characterize, and identify radiological/nuclear (RN) material or weapons. The RadPack is a commercially available broad-area search device used for gamma and also for neutron detection. The PRD is chiefly used as a personal radiation protection device. It is also used to detect contraband radionuclides and to localize radionuclide sources. Neither device has the capacity to characterize or identify radionuclides. The principal aim of this study was to investigate the sensitivity of both the RadPack and the PRD while being used under controlled conditions …
Date:
March 1, 2009
Creator:
Harris, S & Dave Dunn, D
Object Type:
Article
System:
The UNT Digital Library
Evaluation of a Mobile Hot Cell Technology for Processing Idaho National Laboratory Remote-Handled Wastes
The Idaho National Laboratory (INL) currently does not have the necessary capabilities to process all remote-handled wastes resulting from the Laboratory’s nuclear-related missions. Over the years, various U.S. Department of Energy (DOE)-sponsored programs undertaken at the INL have produced radioactive wastes and other materials that are categorized as remote-handled (contact radiological dose rate > 200 mR/hr). These materials include Spent Nuclear Fuel (SNF), transuranic (TRU) waste, waste requiring geological disposal, low-level waste (LLW), mixed waste (both radioactive and hazardous per the Resource Conservation and Recovery Act [RCRA]), and activated and/or radioactively-contaminated reactor components. The waste consists primarily of uranium, plutonium, other TRU isotopes, and shorter-lived isotopes such as cesium and cobalt with radiological dose rates up to 20,000 R/hr. The hazardous constituents in the waste consist primarily of reactive metals (i.e., sodium and sodium-potassium alloy [NaK]), which are reactive and ignitable per RCRA, making the waste difficult to handle and treat. A smaller portion of the waste is contaminated with other hazardous components (i.e., RCRA toxicity characteristic metals). Several analyses of alternatives to provide the required remote-handling and treatment capability to manage INL’s remote-handled waste have been conducted over the years and have included various options ranging from modification of …
Date:
March 1, 2009
Creator:
Orchard, B. J.; Harvego, L. A.; Miklos, R. P.; Yapuncich, F. & Care, L.
Object Type:
Article
System:
The UNT Digital Library
Evaluation of HFIR LEU Fuel Using the COMSOL Multiphysics Platform
A finite element computational approach to simulation of the High Flux Isotope Reactor (HFIR) Core Thermal-Fluid behavior is developed. These models were developed to facilitate design of a low enriched core for the HFIR, which will have different axial and radial flux profiles from the current HEU core and thus will require fuel and poison load optimization. This report outlines a stepwise implementation of this modeling approach using the commercial finite element code, COMSOL, with initial assessment of fuel, poison and clad conduction modeling capability, followed by assessment of mating of the fuel conduction models to a one dimensional fluid model typical of legacy simulation techniques for the HFIR core. The model is then extended to fully couple 2-dimensional conduction in the fuel to a 2-dimensional thermo-fluid model of the coolant for a HFIR core cooling sub-channel with additional assessment of simulation outcomes. Finally, 3-dimensional simulations of a fuel plate and cooling channel are presented.
Date:
March 1, 2009
Creator:
Primm, Trent; Ruggles, Arthur & Freels, James D
Object Type:
Report
System:
The UNT Digital Library
Evaluation of the Start-Up Core Physics Tests at Japan's High Temperature Engineering Test Reactor (Fully-Loaded Core)
None
Date:
March 2009
Creator:
Bess, John D.; Fujimoto, Nozomu; Dolphin, Barbara H.; Snoj, Luka & Zukeran, Atsushi
Object Type:
Report
System:
The UNT Digital Library
Evidence for a Narrow Near-Threshold Structure in the $J/\psi\phi$ Mass Spectrum in $B^+\to J/\psi\phi K^+$ Decays
Evidence is reported for a narrow structure near the J/{psi}{phi} threshold in exclusive B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV. A signal of 14 {+-} 5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of 2.7 fb{sup -1}, collected by the CDF II detector. The mass and natural width of the structure are measured to be 4143.0 {+-} 2.9(stat) {+-} 1.2(syst) MeV/c{sup 2} and 11.7{sub -5.0}{sup +8.3}(stat) {+-} 3.7(syst) MeV/c{sup 2}.
Date:
March 1, 2009
Creator:
Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, Jahred A.; /Chicago U., EFI; Akimoto, T.; U., /Tsukuba et al.
Object Type:
Article
System:
The UNT Digital Library
Expansion into vacuum of a shocked tungsten carbide-epoxy mixture.
The behavior of a shocked tungsten carbide / epoxy mixture as it expands into a vacuum has been studied through a combination of experiments and simulations. X-ray radiography of the expanding material as well as the velocity measured for a stood-off witness late are used to understand the physics of the problem. The initial shock causes vaporization of the epoxy matrix, leading to a multi-phase flow situation as the epoxy expands rapidly at around 8 km/s followed by the WC particles moving around 3 km/s. There are also small amounts of WC moving at higher velocities, apparently due to jetting in the sample. These experiments provide important data about the multi-phase flow characteristics of this material.
Date:
March 1, 2009
Creator:
Reinhart, William Dodd; Thornhill, Tom Finley, III; Vogler, Tracy John & Alexander, C. Scott
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Sunday, March 1, 2009
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 1, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[Fact Sheet on House Bill 197 Insurance Non-Discrimination Bill]
Information about Equality Texas Fact Sheet on several House Bills and any action on specific bills and lists of organizations. There is a post-it note which reads "Jackson."
Date:
March 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
FCC Record, Volume 24, No. 4, Pages 2572 to 3518, February 27 - March 20, 2009
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
March 2009
Creator:
United States. Federal Communications Commission.
Object Type:
Book
System:
The UNT Digital Library
Feed-in Tariff Policy: Design, Implementation, and RPS Policy Interactions
Feed-in tariff (FIT) policies are implemented in more than 40 countries around the world and are cited as the primary reason for the success of the German and Spanish renewable energy markets. As a result of that success, FIT policy proposals are starting to gain traction in several U.S. states and municipalities. Experience from Europe is also beginning to demonstrate that properly designed FITs may be more cost-effective than renewable portfolio standards (RPS), which make use of competitive solicitations. This article explores the design and operation of feed-in tariff policies, including a FIT policy definition, payment-structure options, and payment differentiation. The article also touches on the potential interactions between FIT policies and RPS policies at the state level.
Date:
March 1, 2009
Creator:
Cory, K.; Couture, T. & Kreycik, C.
Object Type:
Report
System:
The UNT Digital Library
Final report for LDRD Project 93633 : new hash function for data protection.
The security of the widely-used cryptographic hash function SHA1 has been impugned. We have developed two replacement hash functions. The first, SHA1X, is a drop-in replacement for SHA1. The second, SANDstorm, has been submitted as a candidate to the NIST-sponsored SHA3 Hash Function competition.
Date:
March 1, 2009
Creator:
Draelos, Timothy John; Dautenhahn, Nathan; Schroeppel, Richard Crabtree; Tolk, Keith Michael; Orman, Hilarie (PurpleStreak, Inc.); Walker, Andrea Mae et al.
Object Type:
Report
System:
The UNT Digital Library
Finders Keepers, Volume 7, Number 1, March 2009
The quarterly newsletter of Johnson County Genealogical Society contains information related to the activities of the society and its members as well as genealogical notes and history for the Johnson County, Texas and surrounding areas.
Date:
March 2009
Creator:
Johnson County Genealogical Society (Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Fireside Corrosion in Oxyfuel Combustion Environments,”
Oxy-fired or low-nitrogen combustion is a technology that will facilitate CO2 capture while also reducing NOx formation and which offers the opportunity for near-zero emissions coal combustion via either the retrofit of existing power plants, or the design of new power plants. Because of the opportunity to improve the environmental performance of the existing coal fired fleet (currently approximately 800 GW of capacity in the US alone) and the potential for converting these plants from air-blown to oxy-fired burners, NETL’s Office of Research & Development is focusing its attention on the impact of retrofitting existing plants on the service life of the materials of construction
Date:
March 1, 2009
Creator:
Holcomb, G. R.; Matthes, S. A.; Rawers, J. C. & Covino, B. S., Jr.
Object Type:
Poster
System:
The UNT Digital Library
First evidence for WW and WZ diboson production with semi-leptonic decays at a Hadron Collider
Presented is a measurement of the simultaneous production of a W{sup {+-}} boson in association with a second weak boson (W{sup {+-}} or Z{sup 0}) in p{bar p} collisions at {radical}s = 1.96 TeV. Events are consider with one electron or one muon, missing transverse energy, and at least two hadronic jets. The data were collected by the D0 detector in Run IIa of the Tevatron accelerator and correspond to 1.07 fb{sup -1} of integrated luminosity for each of the two channels (WW/WZ {yields} e{nu}q{bar q} and WW/WZ {yields} {mu}{nu}q{bar q}). The cross section for WW + WZ production is measured to be 20.2 {+-} 2.5(stat) {+-} 3.6(sys) {+-} 1.2(lum) pb with a Gaussian significance of 4.4 standard deviations above the background-only scenario. This measurement is consistent with the Standard Model prediction and represents the first direct evidence for WW and WZ production with semi-leptonic decays at a hadron collider.
Date:
March 1, 2009
Creator:
Haley, Joseph Glenn Biddle
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
First Measurement of the t anti-t Differential Cross Section d sigma/dM(t anti-t) in p anti-p Collisions at s**(1/2)=1.96-TeV
We present a measurement of the t{bar t} differential cross section with respect to the t{bar t} invariant mass, d{sigma}/dM{sub t{bar t}}, in p{bar p} collisions at {radical}s = 1.96 TeV using an integrated luminosity of 2.7 fb{sup -1} collected by the CDF II experiment. The t{bar t} invariant mass spectrum is sensitive to a variety of exotic particles decaying into t{bar t} pairs. The result is consistent with the standard model expectation, as modeled by PYTHIA with CTEQ5L parton distribution functions.
Date:
March 1, 2009
Creator:
Aaltonen, T.; Phys., /Helsinki Inst. of; Adelman, Jahred A.; /Chicago U., EFI; Akimoto, T.; U., /Tsukuba et al.
Object Type:
Article
System:
The UNT Digital Library