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Results:
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8-(Hydroxymethyl)-3,N4-etheno-C, a potential carcinogenic glycidaldehyde product, miscodes in vitro using mammalian DNA polymerases
None
Date:
January 28, 2002
Creator:
Singer, B.; Medina, Michael; Zhang, Yanbin; Wang, Zhigang; Guliaev, Anton B. & Hang, Bo
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 103, No. 284, Ed. 1 Monday, January 28, 2002
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 28, 2002
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 111, No. 8, Ed. 1 Monday, January 28, 2002
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
January 28, 2002
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
Applications of Sensitivity Analysis to Uncertainty Quantification in Variably Saturated Flow
In this paper, we present results demonstrating the effectiveness of a sensitivity analysis approach to uncertainty quantification of a variably saturated flow model. The basis for our method is a software system which simultaneously solves for solutions of large-scale nonlinear systems of equations and the sensitivity of the solutions to selected parameters. We present test cases showing the effects on the relative uncertainty of pressure due to heterogeneity in the absolute permeability and to differences in parameterizing the Van Genuchten curve soil parameters, {alpha} and n.
Date:
January 28, 2002
Creator:
Woodward, C; Grant, K E & Maxwell, R
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 80, No. 63, Ed. 1 Monday, January 28, 2002
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 28, 2002
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Behavior of Rare Earth Element In Geothermal Systems; A New Exploration/Exploitation Tool
The goal of this four-year project was to provide a database by which to judge the utility of the rare earth elements (REE) in the exploration for and exploitation of geothermal fields in the United States. Geothermal fluids from hot springs and wells have been sampled from a number of locations, including: (1) the North Island of New Zealand (1 set of samples); (2) the Cascades of Oregon; (3) the Harney, Alvord Desert and Owyhee geothermal areas of Oregon; (4) the Dixie Valley and Beowawe fields in Nevada; (5) Palinpion, the Philippines: (6) the Salton Sea and Heber geothermal fields of southern California; and (7) the Dieng field in Central Java, Indonesia. We have analyzed the samples from all fields for REE except the last two.
Date:
January 28, 2002
Creator:
Wood, Scott A.
Object Type:
Report
System:
The UNT Digital Library
BioZone Exploting Source-Capability Information for Integrated Access to Multiple Bioinformatics Data Sources
Modern Bioinformatics data sources are widely used by molecular biologists for homology searching and new drug discovery. User-friendly and yet responsive access is one of the most desirable properties for integrated access to the rapidly growing, heterogeneous, and distributed collection of data sources. The increasing volume and diversity of digital information related to bioinformatics (such as genomes, protein sequences, protein structures, etc.) have led to a growing problem that conventional data management systems do not have, namely finding which information sources out of many candidate choices are the most relevant and most accessible to answer a given user query. We refer to this problem as the query routing problem. In this paper we introduce the notation and issues of query routing, and present a practical solution for designing a scalable query routing system based on multi-level progressive pruning strategies. The key idea is to create and maintain source-capability profiles independently, and to provide algorithms that can dynamically discover relevant information sources for a given query through the smart use of source profiles. Compared to the keyword-based indexing techniques adopted in most of the search engines and software, our approach offers fine-granularity of interest matching, thus it is more powerful and …
Date:
January 28, 2002
Creator:
Liu, Ling; Buttler, David; Paques, Henrique; Pu, Calton & Critchlow, Terence
Object Type:
Article
System:
The UNT Digital Library
Boronization on NSTX using Deuterated Trimethylboron
Boronization on the National Spherical Torus Experiment (NSTX) has proved to be quite beneficial with increases in confinement and density, and decreases in impurities observed in the plasma. The boron has been applied to the interior surfaces of NSTX, about every 2 to 3 weeks of plasma operation, by producing a glow discharge in the vacuum vessel using deuterated trimethylboron (TMB) in a 10% mixture with helium. Special NSTX requirements restricted the selection of the candidate boronization method to the use of deuterated boron compounds. Deuterated TMB met these requirements, but is a hazardous gas and special care in the execution of the boronization process is required. This paper describes the existing GDC, Gas Injection, and Torus Vacuum Pumping System hardware used for this process, the glow discharge process, and the automated control system that allows for remote operation to maximize both the safety and efficacy of applying the boron coating. The administrative requirements and the detailed procedure for the setup, operation and shutdown of the process are also described.
Date:
January 28, 2002
Creator:
Blanchard, W.R.; Gernhardt, R.C.; Kugel, H.W. & LaMarche, P.H.
Object Type:
Report
System:
The UNT Digital Library
Challenges for Plasma Diagnostics in a Next Step Device (FIRE)
The physics program of any next-step tokamak such as FIRE [Fusion Ignition Research Experiment] sets demands for plasma measurement which are at least as comprehensive as on present tokamaks, with the additional capabilities needed for control of the plasma and for understanding the effects of the alpha-particles. The diagnostic instrumentation must be able to provide the fine spatial and temporal resolution required for the advanced tokamak plasma scenarios. It must also be able to overcome the effects of neutron- and gamma-induced electrical noise in ceramic components or detectors, and fluorescence and absorption in optical components. There are practical engineering issues of minimizing radiation streaming while providing essential diagnostic access to the plasma. Many diagnostics will require components at or close to the first wall, e.g., ceramics and MI cable for magnetic diagnostics and mirrors for optical diagnostics; these components must be mounted to operate, and survive, i n fluxes which require special material selection. A better set of diagnostics of alpha-particles than that available for the TFTR [Tokamak Fusion Test Reactor] is essential; it must be qualified well before moving into D-T [deuterim-tritium] experiments. A start has been made to assessing the potential implementation of key diagnostics for the FIRE …
Date:
January 28, 2002
Creator:
Young, Kenneth M.
Object Type:
Report
System:
The UNT Digital Library
Characterization of Mixed Wettability at Different Scales and its Impact on Oil Recovery Efficiency
The objectives of this project was to: (1) quantify the pore scale mechanisms that determine the wettability state of a reservoir, (2) study the effect of crude oil, brine and mineral compositions in the establishment of mixed wet states, (3) clarify the effect of mixed - wettability on oil displacement efficiency in waterfloods, (4) develop a new tracer technique to measure wettability, fluid distributions, residual saturation's and relative permeabilities, and (5) develop methods for properly incorporating wettability in up-scaling from pore to core to reservoir scales.
Date:
January 28, 2002
Creator:
Sharma, Mukul M. & Hirasaki, George J.
Object Type:
Report
System:
The UNT Digital Library
Daily Journal (Perry, Okla.), Vol. 109, No. 19, Ed. 1 Monday, January 28, 2002
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 28, 2002
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Development of a Detector to Measure the Angular Dependence of the Cosmic Ray Induced Neutron Background Flux at Ground Level
The detection of low intensity sources of radiation in containers is of particular interest for arms control, non-proliferation and nuclear smuggling activities. Attempts to procure and smuggle nuclear materials that could be used in terrorist activities have been well documented in recent years. These incidents have included fissile materials such, as plutonium and uranium, as well as medical and industrial isotopes that could be used in a Radiation Dispersal Device. The vast majority of these incidents have been discovered through human intelligence work due to the difficulty of using radiation monitoring. The detection of radiation sources in well-shielded containers presents a difficult technological challenge. Few neutrons and gamma rays may escape from the container and these may be obscured by the naturally occurring background. The world in general is a radioactive environment. Many elements in the earth's crust, as well as in common plants and building materials, emit a constant stream of radiation. In fact the ultimate limit on the detection of hidden sources is often the background level at the location of interest. It has long been understood that knowledge of the directionality of this background can be used to improve the signal/noise ratio in detectors used for these …
Date:
January 28, 2002
Creator:
Morgan, J. F.; Gosnell, T B; Luke, S J; Archer, D E; Lochner, R T; Frank, I M et al.
Object Type:
Report
System:
The UNT Digital Library
Donor and acceptor concentrations in degenerate InN
A formalism is presented to determine donor (N{sub D}) and acceptor (N{sub A}) concentrations in wurtzitic InN characterized by degenerate carrier concentration (n) and mobility ({mu}). The theory includes scattering not only by charged point defects and impurities, but also by charged threading dislocations, of concentration N{sub dis}. For an 0.45-{micro}m-thick InN layer grown on Al{sub 2}O{sub 3} by molecular beam epitaxy, having N{sub dis} = 5 x 10{sup 10} cm{sup -2}, determined by transmission electron microscopy, n(20 K) = 3.5 x 10{sup 18} cm{sup -3}, and {mu}(20 K) = 1055 cm{sup 2}/V-s, determined by Hall-effect measurements, the fitted values are N{sub D} = 4.7 x 10{sup 18} cm{sup -3} and N{sub A} = 1.2 x 10{sup 18} cm{sup -3}. The identities of the donors and acceptors are not known, although a comparison of N{sub D} with analytical data, and also with calculations of defect formation energies, suggests that a potential candidate for the dominant donor is H.
Date:
January 28, 2002
Creator:
Look, D. C.; Lu, H.; Schaff, W. J.; Jasinski, J. & Liliental-Weber, Z.
Object Type:
Article
System:
The UNT Digital Library
Education Finance Incentive Grants Under ESEA Title I
This report estimates the amount of funds that will be awarded to each state according to the formula, and also describes how the grants reward states that have education finance systems with characteristics favored by the formula.
Date:
January 28, 2002
Creator:
Smole, David P.
Object Type:
Report
System:
The UNT Digital Library
Enhanced Mode Conversion of Thermally Emitted Electron Bernstein Waves (EBW)to Extraordinary Mode
In the CDX-U spherical torus, approximately 100% conversion of thermal EBWs to X-mode has been observed by controlling the electron density scale length (Ln) in the conversion region with a local limiter outside the last closed flux surface. The radiation temperature profile agrees with Thomson scattering electron temperature data. Results are consistent with theoretical calculations of conversion efficiency using measured Ln. By reciprocity of the conversion process, prospects for efficient coupling in EBW heating and current drive scenarios are strongly supported.
Date:
January 28, 2002
Creator:
Jones, B.; Efthimion, P. C.; Taylor, G.; Munsat, T.; Wilson, J. R.; Hosea, J. C. et al.
Object Type:
Report
System:
The UNT Digital Library
Environmental regulatory approaches for petroleum refineries.
None
Date:
January 28, 2002
Creator:
Elcock, D.; Gasper, J. & Moses, D. O.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, January 28, 2002
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 28, 2002
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
High Heat Flux Interactions and Tritium Removal from Plasma Facing Components by a Scanning Laser
A new technique for studying high heat flux interactions with plasma facing components is presented. The beam from a continuous wave 300 W neodymium laser was focused to 80 W/mm2 and scanned at high speed over the surface of carbon tiles. These tiles were previously used in the TFTR [Tokamak Fusion Test Reactor] inner limiter and have a surface layer of amorphous hydrogenated carbon that was codeposited during plasma operations. Laser scanning released up to 84% of the codeposited tritium. The temperature rise of the codeposit on the tiles was significantly higher than that of the manufactured material. In one experiment, the codeposit surface temperature rose to 1,770 C while for the same conditions, the manufactured surface increased to only 1,080 C. The peak temperature did not follow the usual square-root dependence on heat pulse duration. Durations of order 100 ms resulted in brittle destruction and material loss from the surface, while a duration of approximately 10 ms showed minimal change. A digital microscope imaged the codeposit before, during, and after the interaction with the laser and revealed hot spots on a 100-micron scale. These results will be compared to analytic modeling and are relevant to the response of plasma …
Date:
January 28, 2002
Creator:
Skinner, C. H.; Gentile, C. A. & Hassanein, A.
Object Type:
Report
System:
The UNT Digital Library
Homeland Security: Coast Guard Operations - Background and Issues for Congress
This report provides information about the Background and Issues for Congress on Homeland Security Coast Guard Operations which is a military service and a branch of the armed forces,within the navy upon the declaration of war or when President directs until the president by executive orders it back to DHS
Date:
January 28, 2002
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Land and Water Conservation Fund: Current Status and Issues
This report provides the current status and issues of land and water conservation fund.
Date:
January 28, 2002
Creator:
Zinn, Jeffrey
Object Type:
Report
System:
The UNT Digital Library
Land and Water Conservation Fund: Current Status and Issues
None
Date:
January 28, 2002
Creator:
Zinn, Jeffrey A.
Object Type:
Report
System:
The UNT Digital Library
Lattice Boltzmann Modeling of Micro-fluidic Devices
The results to date do indeed show that the lattice Boltzmann method accurately solves relevant, non-trivial flow problems. The parallelization of both the fluid and the mobile species in flow has enhanced this capability such that it is useful for solving relevant problems in a timely fashion. The initial studies of stationary or capture species revealed evidence of hydrodynamic screening between upstream and downstream particles. Numerical studies reveal that the critical length for which the test particle is hydrodynamically decoupled from upstream and downstream particles is on the order of 30 sphere radii. For mobile species, the LB capability was shown to be naturally suited for predicting the hydrodynamic lift phenomenon (inertial lift). A conversion factor was developed based on scaling arguments to include relevant forces generated by external fields. Using this conversion, an analytic solution for the Dielectrophoretic force was included into the LB capability which enabled the study of Dielectrophoretic particle capture. The Non-Newtonian enhancements have expanded the applicability of the LB capability to more physical systems. Specifically, with the bead-n-spring representation of macromolecules researchers will be able to study chain dynamics in micro-, physiological and Bio-MEMS environments. Furthermore, the ability to capture the shear thinning behavior, without …
Date:
January 28, 2002
Creator:
Clague, D S
Object Type:
Report
System:
The UNT Digital Library
Magnetized Turbulent Dynamo in Protogalaxies
The prevailing theory for the origin of cosmic magnetic fields is that they have been amplified to their present values by the turbulent dynamo inductive action in the protogalactic and galactic medium. Up to now, in calculation of the turbulent dynamo, it has been customary to assume that there is no back reaction of the magnetic field on the turbulence, as long as the magnetic energy is less than the turbulent kinetic energy. This assumption leads to the kinematic dynamo theory. However, the applicability of this theory to protogalaxies is rather limited. The reason is that in protogalaxies the temperature is very high, and the viscosity is dominated by magnetized ions. As the magnetic field strength grows in time, the ion cyclotron time becomes shorter than the ion collision time, and the plasma becomes strongly magnetized. As a result, the ion viscosity becomes the Braginskii viscosity. Thus, in protogalaxies the back reaction sets in much earlier, at field strengths much lower than those which correspond to field-turbulence energy equipartition, and the turbulent dynamo becomes what we call the magnetized turbulent dynamo. In this paper we lay the theoretical groundwork for the magnetized turbulent dynamo. In particular, we predict that the …
Date:
January 28, 2002
Creator:
Malyshkin, Leonid & Kulsrud, Russell M.
Object Type:
Report
System:
The UNT Digital Library
Microinstability Studies for the Large Helical Device
Fully kinetic assessments of the stability properties of toroidal drift modes have been obtained for cases for the Large Helical Device (LHD). This calculation employs the comprehensive linear microinstability code FULL, as recently extended for nonaxisymmetric systems. The code retains the important effects in the linearized gyrokinetic equation, using the lowest-order ''ballooning representation'' for high toroidal mode number instabilities in the electrostatic limit. These effects include trapped particles, FLR, transit and bounce and magnetic drift frequency resonances, etc., for any number of plasma species. Results for toroidal drift waves destabilized by trapped electrons and ion temperature gradients are presented, using numerically-calculated three-dimensional MHD equilibria. These are reconstructed from experimental measurements. Quasilinear fluxes of particles and energy for each species are also calculated. Pairs of LHD discharges with different magnetic axis positions and with and without pellet injection are compared.
Date:
January 28, 2002
Creator:
Rewoldt, G.; Ku, L. P.; Tang, W. M.; Sugama, H.; Nakajima, N.; Watanabe, K. Y. et al.
Object Type:
Report
System:
The UNT Digital Library