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3,089 Matching Results
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[Carnivorous plant in preserve]
Photograph of a red carnivorous plant in the middle of Big Thicket National Preserve in Kountze, Texas. The photo is taken from above the plant.
Date:
October 2005
Creator:
Mallory, Randy
Object Type:
Photograph
System:
The UNT Digital Library
CDF's Higgs sensitivity status
The combined sensitivity of CDF's current Standard Model Higgs boson searches is presented. The expected 95% CL limits on the production cross section times the relevant Higgs boson branching ratios are computed for the W{sup {+-}}H {yields} {ell}{sup {+-}}{nu}b{bar b}, ZH {yields} {nu}{bar {nu}}b{bar b}, gg {yields} H {yields} W{sup +}W{sup -} W{sup {+-}}H {yields} W{sup {+-}}W{sup +}W{sup -} channels as they stand as of the October 2005, using results which were prepared for Summer 2005 conferences and a newer result form the gg {yields} H {yields} W{sup +}W{sup -} channel. Correlated and uncorrelated systematic uncertainties are taken into account, and the luminosity requirements for 95% CL exclusion, 3{sigma} evidence, and 5{sigma} discovery are computed for median experimental outcomes. A list of improvements required to achieve the sensitivity to a SM Higgs boson as quantified in the Higgs Sensitivity Working Group's report is provided.
Date:
October 1, 2005
Creator:
Junk, Tom
Object Type:
Article
System:
The UNT Digital Library
CFD Model Of A Planar Solid Oxide Electrolysis Cell For Hydrogen Production From Nuclear Energy
A three-dimensional computational fluid dynamics (CFD) model has been created to model hightemperature steam electrolysis in a planar solid oxide electrolysis cell (SOEC). The model represents a single cell as it would exist in an electrolysis stack. Details of the model geometry are specific to a stack that was fabricated by Ceramatec2, Inc. and tested at the Idaho National Laboratory. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT2. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, Nernst potential, operating potential, anode-side gas composition, cathode-side gas composition, current density and hydrogen production over a range of stack operating conditions. Mean model results are shown to compare favorably with experimental results obtained from an actual ten-cell stack tested at INL.
Date:
October 1, 2005
Creator:
Hawkes, Grant L.; O'Brien, James E.; Stoots, Carl M. & Herring, J. Stephen
Object Type:
Article
System:
The UNT Digital Library
Channel Transmission Loss Studies During Ephemeral Flow Events: ER-5-3 Channel and Cambric Ditch, Nevada Test Site, Nye County, Nevada
Transmission losses along ephemeral channels are an important, yet poorly understood, aspect of rainfall-runoff prediction. Losses occur as flow infiltrates channel bed, banks, and floodplains. Estimating transmission losses in arid environments is difficult because of the variability of surficial geomorphic characteristics and infiltration capacities of soils and near-surface low-permeability geologic layers (e.g., calcrete). Transmission losses in ephemeral channels are nonlinear functions of discharge and time (Lane, 1972), and vary spatially along the channel reach and with soil antecedent moisture conditions (Sharma and Murthy, 1994). Rainfall-runoff models used to estimate peak discharge and runoff volume for flood hazard assessment are not designed specifically for ephemeral channels, where transmission loss can be significant because of the available storage volume in channel soils. Accuracy of the flow routing and rainfall-runoff models is dependent on the transmission loss estimate. Transmission loss rate is the most uncertain parameter in flow routing through ephemeral channels. This research, sponsored by the U.S. Department of Energy, National Nuclear Security Administration (DOE/NNSA) and conducted at the Nevada Test Site (NTS), is designed to improve understanding of the impact of transmission loss on ephemeral flood modeling and compare various methodologies for predicting runoff from rainfall events. Various applications of this …
Date:
October 1, 2005
Creator:
Miller, J. J.; Mizell, S. A.; French, R. H.; Meadows, D. G. & Young, M. H.
Object Type:
Report
System:
The UNT Digital Library
Channel Transmission Loss Studies During Ephemeral Flow Events: ER-5-3 Channel and Cambric Ditch, Nevada Test Site, Nye County, Nevada
Transmission losses along ephemeral channels are an important, yet poorly understood, aspect of rainfall-runoff prediction. Losses occur as flow infiltrates channel bed, banks, and floodplains. Estimating transmission losses in arid environments is difficult because of the variability of surficial geomorphic characteristics and infiltration capacities of soils and near-surface low-permeability geologic layers (e.g., calcrete). Transmission losses in ephemeral channels are nonlinear functions of discharge and time (Lane, 1972), and vary spatially along the channel reach and with soil antecedent moisture conditions (Sharma and Murthy, 1994). Rainfall-runoff models used to estimate peak discharge and runoff volume for flood hazard assessment are not designed specifically for ephemeral channels, where transmission loss can be significant because of the available storage volume in channel soils. Accuracy of the flow routing and rainfall-runoff models is dependent on the transmission loss estimate. Transmission loss rate is the most uncertain parameter in flow routing through ephemeral channels. This research, sponsored by the U.S. Department of Energy, National Nuclear Security Administration (DOE/NNSA) and conducted at the Nevada Test Site (NTS), is designed to improve understanding of the impact of transmission loss on ephemeral flood modeling and compare various methodologies for predicting runoff from rainfall events. Various applications of this …
Date:
October 1, 2005
Creator:
Miller, J. J.; Mizell, S. A.; French, R. H.; Meadows, D. G. & Young, M. H.
Object Type:
Report
System:
The UNT Digital Library
Children with Special Health Care Needs: Newsletter for Families, October 2005
Bilingual newsletter from the Texas Department of State Health Services providing information on health care for children with special needs, including resources for medical help and community services.
Date:
October 2005
Creator:
Texas. Department of State Health Services.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Christian Chronicle (Oklahoma City, Okla.), Vol. 62, No. 10, Ed. 1, October 2005
Monthly newspaper from Oklahoma City, Oklahoma that includes news and information about the Churches of Christ along with advertising.
Date:
October 2005
Creator:
McBride, Bailey
Object Type:
Newspaper
System:
The Portal to Texas History
Clean Cities Now, Vol. 9, No. 3 - October 2005
Newsletter features articles on Clean Cities, such as coalition news, stakeholder success stories, and Technical Assistance projects. Industry news, EPAct updates, and new resources are also covered.
Date:
October 1, 2005
Creator:
unknown
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
[Close up of Bigfoot]
Photograph of the face of a Bigfoot statue on display at the Southern Crypto Conference that discussed the creature's sightings and the formation of the Texas Bigfoot Research Center (TBRC). The photo is a close up of the statue.
Date:
October 2005
Creator:
Mallory, Randy
Object Type:
Image
System:
The UNT Digital Library
[Close up of Howard]
Photograph of Howard Peacock smiling up at the sunlight while walking along a path in Big Thicket National Preserve in Kountze, Texas. The photo is a close up.
Date:
October 2005
Creator:
Mallory, Randy
Object Type:
Photograph
System:
The UNT Digital Library
[Close up of plant]
Photograph of a plant being spotlighted by sunlight in the middle of Big Thicket National Preserve in Kountze, Texas. The photo is a close up.
Date:
October 2005
Creator:
Mallory, Randy
Object Type:
Photograph
System:
The UNT Digital Library
[Close up of plant in preserve]
Photograph of plants growing inside of Big Thicket National Preserve. The photo is a close up.
Date:
October 2005
Creator:
Mallory, Randy
Object Type:
Photograph
System:
The UNT Digital Library
Closure Report for Corrective Action Unit 390: Areas 9, 10, and 12 Spill Sites, Nevada Test Site, Nevada
Corrective Action Unit (CAU) 390 consists four Corrective Action Sites (CASs) located in Areas 9, 10, and 12 of the Nevada Test Site. The closure activities performed at the CASs include: (1) CAS 09-99-03, Wax, Paraffin: 2 cubic yards of drilling polymer was removed on June 20,2005, and transported to the Area 9 Landfill for disposal. (2) CAS 10-99-01, Epoxy Tar Spill: 2 cubic feet of asphalt waste was removed on June 20,2005, and transported to the Area 9 Landfill for disposal. (3) CAS 10-99-03, Tar Spills: 3 cubic yards of deteriorated asphalt waste was removed on June 20,2005, and transported to the Area 9 Landfill for disposal. (4) CAS 12-25-03, Oil Stains (2); Container: Approximately 16 ounces of used oil were removed from ventilation equipment on June 28,2005, and recycled. One CAS 10-22-19, Drums, Stains, was originally part of CAU 390 but was transferred out of CAU 390 and into CAU 550, Drums, Batteries, and Lead Materials. The transfer was approved by the Nevada Division of Environmental Protection on August 19,2005, and a copy of the approval letter is included in Appendix D of this report.
Date:
October 1, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Closure Report for Corrective Action Unit 395: Area 19 Spill Sites, Nevada Test Site, Nevada
Corrective Action Unit (CAU) 395, Area 19 Spill Sites, consists of nine Corrective Action Sites (CASs) located in Area 19 of the Nevada Test Site. Closure activities performed at each CAS include: (1) CAS 19-19-04, Concrete Spill: A concrete spill could not be located at the site. Therefore, no further action was taken. (2) CAS 19-25-03, Oil Spills: Approximately five cubic yards of hydrocarbon-impacted soil and various used oil filters were removed from the site and transported to the Area 6 Hydrocarbon Landfill for disposal. (3) CAS 19-44-02, Fuel Spill: Less than 0.5 cubic feet of hydrocarbon-impacted soil was removed from a concrete pad and transported to the Area 6 Hydrocarbon Landfill for disposal. (4) CAS 19-44-04, U-19bk Drill Site Release: Approximately four cubic yards of hydrocarbon-impacted soil were removed from the site and transported to the Area 6 Hydrocarbon Landfill for disposal. (5) CAS 19-44-05, U-19bh Drill Site Release: Evidence of an oil spill could not be found at the site. Therefore, no further action was taken. (6) CAS 19-99-05, Pile; Unknown Material: Based on previous sampling activities by International Technology (IT) Corporation the material was determined to be non-hazardous. Due to the remote location of the material and …
Date:
October 1, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
CO2 Sequestration Potential of Texas Low-Rank Coals
The objectives of this project are to evaluate the feasibility of carbon dioxide (CO{sub 2}) sequestration in Texas low-rank coals and to determine the potential for enhanced coalbed methane (ECBM) recovery as an added benefit of sequestration. The main objectives for this reporting period were to perform reservoir simulation and economic sensitivity studies to (1) determine the effects of injection gas composition, (2) determine the effects of injection rate, and (3) determine the effects of coal dewatering prior to CO{sub 2} injection on CO{sub 2} sequestration in the Lower Calvert Bluff Formation (LCB) of the Wilcox Group coals in east-central Texas. To predict CO{sub 2} sequestration and ECBM in LCB coal beds for these three sensitivity studies, we constructed a 5-spot pattern reservoir simulation model and selected reservoir parameters representative of a typical depth, approximately 6,200-ft, of potential LCB coalbed reservoirs in the focus area of East-Central Texas. Simulation results of flue gas injection (13% CO{sub 2} - 87% N{sub 2}) in an 80-acre 5-spot pattern (40-ac well spacing) indicate that LCB coals with average net thickness of 20 ft can store a median value of 0.46 Bcf of CO{sub 2} at depths of 6,200 ft, with a median ECBM …
Date:
October 1, 2005
Creator:
McVay, Duane A.; Jr, Walter B. Ayers & Jensen, Jerry L.
Object Type:
Report
System:
The UNT Digital Library
Coeur Rochester, Inc.: Plant-Wide Assessment of Nevada Silver Mine Finds Opportunities to Improve Process Control and Reduce Energy Consumption
The Coeur Rochester silver mine in Nevada would save almost 11 million kilowatt-hours and $813,000 annually by implementing the five energy efficiency projects described in this ITP case study.
Date:
October 1, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Commercial Alloys for Sulfuric Acid Vaporization in Thermochemical Hydrogen Cycles
Most thermochemical cycles being considered for producing hydrogen include a processing stream in which dilute sulfuric acid is concentrated, vaporized and then decomposed over a catalyst. The sulfuric acid vaporizer is exposed to highly aggressive conditions. Liquid sulfuric acid will be present at a concentration of >96 wt% (>90 mol %) H2SO4 and temperatures exceeding 400oC [Brown, et. al, 2003]. The system will also be pressurized, 0.7-3.5 MPa, to keep the sulfuric acid in the liquid state at this temperature and acid concentration. These conditions far exceed those found in the commercial sulfuric acid generation, regeneration and handling industries. Exotic materials, e.g. ceramics, precious metals, clad materials, etc., have been proposed for this application [Wong, et. al., 2005]. However, development time, costs, reliability, safety concerns and/or certification issues plague such solutions and should be considered as relatively long-term, optimum solutions. A more cost-effective (and relatively near-term) solution would be to use commercially-available metallic alloys to demonstrate the cycle and study process variables. However, the corrosion behavior of commercial alloys in sulfuric acid is rarely characterized above the natural boiling point of concentrated sulfuric acid (~250oC at 1 atm). Therefore a screening study was undertaken to evaluate the suitability of various …
Date:
October 1, 2005
Creator:
Lillo, Thomas M. & Delezene-Briggs, Karen M.
Object Type:
Article
System:
The UNT Digital Library
Comparative Plant Genomics Resources at Plant GDB
Article on comparative plant genomics resources at plant GDB.
Date:
October 2005
Creator:
Dong, Qunfeng; Lawrence, Carolyn J.; Schlueter, Shannon D.; Wilkerson, Matthew D.; Kurtz, Stefan; Brendel, Volker et al.
Object Type:
Article
System:
The UNT Digital Library
A Comprehensive Statistically-Based Method to Interpret Real-Time Flowing Measurements
This project is motivated by the increasing use of distributed temperature sensors for real-time monitoring of complex wells (horizontal, multilateral and multi-branching wells) to infer the profiles of oil, gas, and water entry. Measured information can be used to interpret flow profiles along the wellbore including junction and build section. In this second project year, we have completed a forward model to predict temperature and pressure profiles in complex wells. As a comprehensive temperature model, we have developed an analytical reservoir flow model which takes into account Joule-Thomson effects in the near well vicinity and multiphase non-isothermal producing wellbore model, and couples those models accounting mass and heat transfer between them. For further inferences such as water coning or gas evaporation, we will need a numerical non-isothermal reservoir simulator, and unlike existing (thermal recovery, geothermal) simulators, it should capture subtle temperature change occurring in a normal production. We will show the results from the analytical coupled model (analytical reservoir solution coupled with numerical multi-segment well model) to infer the anomalous temperature or pressure profiles under various conditions, and the preliminary results from the numerical coupled reservoir model which solves full matrix including wellbore grids. We applied Ramey's model to the …
Date:
October 1, 2005
Creator:
Dawkrajai, Pinan; Yoshioka, Keita; Romero, Analis A.; Zhu, Ding; Hill, A.D. & Lake, Larry W.
Object Type:
Report
System:
The UNT Digital Library
Conjecture on the physical implications of the scale anomaly
Murray Gell-Mann, after co-inventing QCD, recognized the interplay of the scale anomaly, the renormalization group, and the origin of the strong scale, {Lambda}{sub QCD}. I tell a story, then elaborate this concept, and for the sake of discussion, propose a conjecture that the physical world is scale invariant in the classical, {h_bar}, limit. This principle has implications for the dimensionality of space-time, the cosmological constant, the weak scale, and Planck scale.
Date:
October 1, 2005
Creator:
Hill, Christopher T.
Object Type:
Article
System:
The UNT Digital Library
Consequence management, recovery & restoration after a contamination event.
The fate of contaminants after a dispersal event is a major concern, and waterways may be particularly sensitive to such an incident. Contaminants could be introduced directly into a water system (municipal or general) or indirectly (Radiological Dispersal Device) from aerial dispersion, precipitation, or improper clean-up techniques that may wash contamination into storm water drains, sewer systems, rivers, lakes, and reservoirs. Most radiological, chemical, and biological contaminants have an affinity for sediments and organic matter in the water system. If contaminated soils enter waterways, a plume of contaminated sediments could be left behind, subject to remobilization during the next storm event. Or, contaminants could remain in place, thus damaging local ecosystems. Suitable planning and deployment of resources to manage such a scenario could considerably mitigate the severity of the event. First responses must be prearranged so that clean-up efforts do not increase dispersal and exacerbate the problem. Interactions between the sediment, contaminant, and water cycle are exceedingly complex and poorly understood. This research focused on the development of a risk-based model that predicts the fate of introduced contaminants in surface water systems. Achieving this goal requires integrating sediment transport with contaminant chemical reactions (sorption and desorption) and surface water hydrodynamics. …
Date:
October 1, 2005
Creator:
Jones, Craig R.; James, Scott Carlton & Roberts, Jesse Daniel
Object Type:
Report
System:
The UNT Digital Library
Conservation patterns in different functional sequence categories of divergent Drosophila species
We have explored the distributions of fully conservedungapped blocks in genome-wide pairwise alignments of recently completedspecies of Drosophila: D.yakuba, D.ananassae, D.pseudoobscura, D.virilisand D.mojavensis. Based on these distributions we have found that nearlyevery functional sequence category possesses its own distinctiveconservation pattern, sometimes independent of the overall sequenceconservation level. In the coding and regulatory regions, the ungappedblocks were longer than in introns, UTRs and non-functional sequences. Atthe same time, the blocks in the coding regions carried 3N+2 signaturecharacteristic to synonymic substitutions in the 3rd codon positions.Larger block sizes in transcription regulatory regions can be explainedby the presence of conserved arrays of binding sites for transcriptionfactors. We also have shown that the longest ungapped blocks, or'ultraconserved' sequences, are associated with specific gene groups,including those encoding ion channels and components of the cytoskeleton.We discussed how restrained conservation patterns may help in mappingfunctional sequence categories and improving genomeannotation.
Date:
October 1, 2005
Creator:
Papatsenko, Dmitri; Kislyuk, Andrey; Levine, Michael & Dubchak, Inna
Object Type:
Article
System:
The UNT Digital Library
Constraining inverse curvature gravity with supernovae
We show that the current accelerated expansion of the Universe can be explained without resorting to dark energy. Models of generalized modified gravity, with inverse powers of the curvature can have late time accelerating attractors without conflicting with solar system experiments. We have solved the Friedman equations for the full dynamical range of the evolution of the Universe. This allows us to perform a detailed analysis of Supernovae data in the context of such models that results in an excellent fit. Hence, inverse curvature gravity models represent an example of phenomenologically viable models in which the current acceleration of the Universe is driven by curvature instead of dark energy. If we further include constraints on the current expansion rate of the Universe from the Hubble Space Telescope and on the age of the Universe from globular clusters, we obtain that the matter content of the Universe is 0.07 {le} {omega}{sub m} {le} 0.21 (95% Confidence). Hence the inverse curvature gravity models considered can not explain the dynamics of the Universe just with a baryonic matter component.
Date:
October 1, 2005
Creator:
Mena, Olga; Santiago, Jose & Weller, Jochen
Object Type:
Article
System:
The UNT Digital Library
Control of Chemical, Thermal, and Gas Transport Properties in Dense Phosphazene Polymer Membranes.
Polyphosphazenes are hybrid polymers having organic pendant groups attached to an inorganic backbone. Phosphazene polymers can be tailored to specific applications through the attachment of a variety of different pendant groups to the phosphazene backbone. Applications for which these polymers have proven useful include solid polymer electrolytes for batteries and fuel cells, as well as, membranes for gas and liquid separations. In past work, phosphazene polymers have been synthesized using mixtures of pendant groups with differing chemical affinities. Specific ratios of hydrophobic and hydrophilic pendant groups were placed on the phosphazene backbone with a goal of demonstrating control of solubility, and therefore chemical selectivity. In this work, a series of phosphazene homo-polymers were synthesized having varying amounts of hydrophobic and hydrophilic character on each individual pendant group. Polymers were synthesized having a hydrophilic portion next to the polymer backbone and the hydrophobic portion on the terminal end of the pendant group. The effects of these combined hydrophobic/hydrophilic pendant groups on polymer morphology and gas transport properties are presented. The following data will be addressed: thermal characterization, pure gas permeability on seven gases (Ar, H2, O2, N2, CO2, and CH4 ), and ideal selectivity for the gas pairs: O2/N2, H2/CO2, CO2/H2, …
Date:
October 1, 2005
Creator:
Orme, Christopher J.; Stewart, Frederick F.; Stone, Mark L.; Harrup, Mason K.; Luther, Thomas A. & Peterson, Eric S.
Object Type:
Article
System:
The UNT Digital Library