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340 Matching Results
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The Clifton Record (Clifton, Tex.), Vol. 114, No. 14, Ed. 1 Wednesday, April 8, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 8, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 110, No. 14, Ed. 1 Friday, April 8, 2005
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 8, 2005
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 58, No. 14, Ed. 1 Thursday, April 8, 2004
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
April 8, 2004
Creator:
Perez, Jerry
Object Type:
Newspaper
System:
The Portal to Texas History
The Rattler (San Antonio, Tex.), Vol. 96, No. 10, Ed. 1 Wednesday, April 8, 2009
Student newspaper from St. Mary's University in San Antonio, Texas that includes campus news along with advertising.
Date:
April 8, 2009
Creator:
St. Mary's University (San Antonio, Tex.)
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 122, No. 29, Ed. 1 Thursday, April 8, 2004
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
April 8, 2004
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 118, No. 15, Ed. 1 Thursday, April 8, 2004
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 8, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 34, No. 15, Ed. 1 Thursday, April 8, 2004
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with advertising.
Date:
April 8, 2004
Creator:
Judson, Mary
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 94, No. 50, Ed. 1 Sunday, April 8, 2001
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 8, 2001
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
FIELD-SCALE EFFECTIVE MATRIX DIFFUSION COEFFICIENT FOR FRACTURED ROCK:RESULTS FROM LITERATURE SURVEY
Matrix diffusion is an important mechanism for solute transport in fractured rock. We recently conducted a literature survey on the effective matrix diffusion coefficient, D{sub m}{sup e}, a key parameter for describing matrix diffusion processes at the field scale. Forty field tracer tests at 15 fractured geologic sites were surveyed and selected for the study, based on data availability and quality. Field-scale D{sub m}{sup e} values were calculated, either directly using data reported in the literature or by reanalyzing the corresponding field tracer tests. Surveyed data indicate that the effective-matrix-diffusion-coefficient factor F{sub D} (defined as the ratio of D{sub m}{sup e} to the lab-scale matrix diffusion coefficient [D{sub m}] of the same tracer) is generally larger than one, indicating that the effective matrix diffusion coefficient in the field is comparatively larger than the matrix diffusion coefficient at the rock-core scale. This larger value can be attributed to the many mass-transfer processes at different scales in naturally heterogeneous, fractured rock systems. Furthermore, we observed a moderate trend toward systematic increase in the F{sub D} value with observation scale, indicating that the effective matrix diffusion coefficient is likely to be statistically scale dependent. The F{sub D} value ranges from 1 to 10,000 …
Date:
April 8, 2005
Creator:
Zhou, Q.; Liu, Hui-Hai; Molz, F.J.; Zhang, Y. & Bodvarsson, G.S.
Object Type:
Report
System:
The UNT Digital Library
Risk Reduction With a Fuzzy Expert Exploration Tool
Incomplete or sparse information on types of data such as geologic or formation characteristics introduces a high level of risk for oil exploration and development projects. ''Expert'' systems developed and used in several disciplines and industries have demonstrated beneficial results. A state-of-the-art exploration ''expert'' tool, relying on a computerized database and computer maps generated by neural networks, is being developed through the use of ''fuzzy'' logic, a relatively new mathematical treatment of imprecise or non-explicit parameters and values. Oil prospecting risk can be reduced with the use of a properly developed and validated ''Fuzzy Expert Exploration (FEE) Tool.'' This FEE Tool can be beneficial in many regions of the U.S. by enabling risk reduction in oil and gas prospecting as well as decreased prospecting and development costs. In the 1998-1999 oil industry environment, many smaller exploration companies lacked the resources of a pool of expert exploration personnel. Downsizing, low oil prices, and scarcity of exploration funds have also affected larger companies, and will, with time, affect the end users of oil industry products in the U.S. as reserves are depleted. The FEE Tool will benefit a diverse group in the U.S., leading to a more efficient use of scarce funds, …
Date:
April 8, 2004
Creator:
Balch, Robert
Object Type:
Report
System:
The UNT Digital Library
Establishment of an Industry-Driven Consortium Focused on Improving the Production Performance of Domestic Stripper Wells Quarterly Report
The Pennsylvania State University, under contract to the U.S. Department of Energy, National Energy Technology Laboratory will establish, promote, and manage a national industry-driven Stripper Well Consortium (SWC) that will be focused on improving the production performance of domestic petroleum and/or natural gas stripper wells. The consortium creates a partnership with the U.S. petroleum and natural gas industries and trade associations, state funding agencies, academia, and the National Energy Technology Laboratory. This report serves as the ninth quarterly technical progress report for the SWC. Key activities for this reporting period include: (1) organizing and hosting two fall technology transfer meetings, (2) SWC membership class expansion, and (3) planning the SWC 2003 Spring meeting. In addition, a literature search that focuses on the use of lasers, microwaves, and acoustics for potential stripper well applications continued.
Date:
April 8, 2003
Creator:
Morrison, Joel L.
Object Type:
Report
System:
The UNT Digital Library
MESERAN Calibration for Low Level Organic Residues
Precision cleaning studies done at Honeywell Federal Manufacturing & Technologies (FM&T), the Kansas City Plant (KCP), and at other locations within the Department of Energy (DOE) Weapons complex over the last 30 years have depended upon results from MESERAN Evaporative Rate Analysis for detecting low levels of organic contamination. The characterization of the surface being analyzed is carried out by depositing a Carbon-14 tagged radiochemical onto the test surface and monitoring the rate at which the radiochemical disappears from the surface with a Geiger-Mueller counter. In the past, the total number of counts over a 2-minute span have been used to judge whether a surface is contaminated or not and semi-quantitatively to what extent. This technique is very sensitive but has not enjoyed the broad acceptance of a purely quantitative analysis. The work on this project developed calibrations of various organic contaminants typically encountered in KCP operations. In addition, a new analysis method was developed to enhance the ability of MESERAN Analyzers to detect organic contamination and yield quantitative data in the microgram and nanogram levels.
Date:
April 8, 2004
Creator:
Benkovich, M.G.
Object Type:
Report
System:
The UNT Digital Library
Former NFL Players: Disabilities, Benefits, and Related Issues
This report discusses professional football players' injuries and health conditions that might have long-term consequences for their health.
Date:
April 8, 2008
Creator:
Halchin, L. Elaine
Object Type:
Report
System:
The UNT Digital Library
Pressure diffusion waves in porous media
Pressure diffusion wave in porous rocks are under consideration. The pressure diffusion mechanism can provide an explanation of the high attenuation of low-frequency signals in fluid-saturated rocks. Both single and dual porosity models are considered. In either case, the attenuation coefficient is a function of the frequency.
Date:
April 8, 2003
Creator:
Silin, Dmitry; Korneev, Valeri & Goloshubin, Gennady
Object Type:
Article
System:
The UNT Digital Library
Orbit: A Code for Collective Beam Dynamics in High Intensity Rings.
We are developing a computer code, ORBIT, specifically for beam dynamics calculations in high-intensity rings. Our approach allows detailed simulation of realistic accelerator problems. ORBIT is a particle-in-cell tracking code that transports bunches of interacting particles through a series of nodes representing elements, effects, or diagnostics that occur in the accelerator lattice. At present, ORBIT contains detailed models for strip-foil injection, including painting and foil scattering; rf focusing and acceleration; transport through various magnetic elements; longitudinal and transverse impedances; longitudinal, transverse, and three-dimensional space charge forces; collimation and limiting apertures; and the calculation of many useful diagnostic quantities. ORBIT is an object-oriented code, written in C++ and utilizing a scripting interface for the convenience of the user. Ongoing improvements include the addition of a library of accelerator maps, BEAMLINE/MXYZPTLK, the introduction of a treatment of magnet errors and fringe fields; the conversion of the scripting interface to the standard scripting language, Python; and the parallelization of the computations using MPI. The ORBIT code is an open source, powerful, and convenient tool for studying beam dynamics in high-intensity rings.
Date:
April 8, 2002
Creator:
Holmes, J. A.; Danilov, V.; Galambos, J.; Shishlo, A.; Cousineau, S.; Chou, W. et al.
Object Type:
Article
System:
The UNT Digital Library
Carbon sequestration in natural gas reservoirs: Enhanced gas recovery and natural gas storage
Natural gas reservoirs are obvious targets for carbon sequestration by direct carbon dioxide (CO{sub 2}) injection by virtue of their proven record of gas production and integrity against gas escape. Carbon sequestration in depleted natural gas reservoirs can be coupled with enhanced gas production by injecting CO{sub 2} into the reservoir as it is being produced, a process called Carbon Sequestration with Enhanced Gas Recovery (CSEGR). In this process, supercritical CO{sub 2} is injected deep in the reservoir while methane (CH{sub 4}) is produced at wells some distance away. The active injection of CO{sub 2} causes repressurization and CH{sub 4} displacement to allow the control and enhancement of gas recovery relative to water-drive or depletion-drive reservoir operations. Carbon dioxide undergoes a large change in density as CO{sub 2} gas passes through the critical pressure at temperatures near the critical temperature. This feature makes CO{sub 2} a potentially effective cushion gas for gas storage reservoirs. Thus at the end of the CSEGR process when the reservoir is filled with CO{sub 2}, additional benefit of the reservoir may be obtained through its operation as a natural gas storage reservoir. In this paper, we present discussion and simulation results from TOUGH2/EOS7C of gas …
Date:
April 8, 2003
Creator:
Oldenburg, Curtis M.
Object Type:
Article
System:
The UNT Digital Library
Longitudinal Dynamics in High Frequency FFAG Recirculating Accelerators.
A recirculating accelerator accelerates the beam by passing through accelerating cavities multiple times. An FFAG recirculating accelerator uses a single arc to connect the linacs together, as opposed to multiple arcs for the different energies. For most scenarios using high-frequency RF, it is impractical to change the phase of the RF on each pass, at least for lower energy accelerators. Ideally, therefore, the WAG arc will be isochronous, so that the particles come back to the same phase (on-crest) on each linac pass. However, it is not possible to make the FFAG arcs isochronous (compared to the RF period) over a large energy range. This paper demonstrates that one can nonetheless make an WAG recirculating accelerator work. Given the arc's path length as a function of energy and the number of turns to accelerate for, one can find the minimum voltage (and corresponding initial conditions) required to accelerate a reference particle to the desired energy. I also briefly examine how the longitudinal acceptance varies with the number of turns that one accelerates.
Date:
April 8, 2002
Creator:
Berg, J. S.
Object Type:
Article
System:
The UNT Digital Library
Steady State Creep of Zirconium at High and Intermediate Temperatures
Creep of zirconium and zirconium alloys has been labeled ''anomalous.'' Researchers often report that zirconium and its alloys never reach true steady state creep and have stress exponents that continuously change with stress and temperature. Many varied interpretations have been offered explaining the creep behavior of zirconium. Some have suggested that creep is diffusion controlled, while others maintain that creep is dislocation glide controlled. Cumulative zirconium creep data will be presented based on an extensive literature review. An interpretation of results will be presented and compared to previous interpretations.
Date:
April 8, 2000
Creator:
Rosen, R.S. & Hayes, T.A.
Object Type:
Article
System:
The UNT Digital Library
Molecular Dissection of The Cellular Mechanisms Involved In Nickel Hyperaccumulation in Plants
Hyperaccumulator plant species are able to accumulate between 1-5% of their biomass as metal. However, these plants are often small, slow growing, and do not produce a high biomass. Phytoextraction, a cost-effective, in situ, plant based approach to soil remediation takes advantage of the remarkable ability of hyperaccumulating plants to concentrate metals from the soil and accumulate them in their harvestable, above-ground tissues. However, to make use of the valuable genetic resources identified in metal hyperaccumulating species, it will be necessary to transfer this material to high biomass rapidly growing crop plants. These plants would then be ideally suited to the phytoremediation process, having the ability to produce large amount of metal-rich plant biomass for rapid harvest and soil cleanup. Although progress is being made in understanding the genetic basis of metal hyperaccumulation a more complete understanding will be necessary before we can take full advantage of the genetic potential of these plants.
Date:
April 8, 2002
Creator:
Salt, David E.
Object Type:
Report
System:
The UNT Digital Library
Thermodynamic Modeling of the SRS Evaporators: Part IV. Incorporation of High Caustic Aluminosilicate Solubility Data
Accumulations of two solid phases (a nitrated aluminosilicate) and sodium diuranate, in the form of scale, caused the SRS 2H Evaporator pot to become completely inoperable in October 1999. The accumulation of the sodium diuranate phase, which selectively precipitated with the aluminosilicate phase, caused criticality concerns in the 2H Evaporator. In order to understand the role of steady state saturation on the scale formation, solutions processed from the SRS 2H, 2F, and 3H Evaporators were evaluated with a commercially available thermodynamic equilibrium code known as Geochemist's Workbench
Date:
April 8, 2003
Creator:
Jantzen, Carol M.; Pareizs, J. M. & Edwards, T. B.
Object Type:
Report
System:
The UNT Digital Library
Studies of the Coherent Half Integer Resonance.
We present studies of space-charge-induced beam profile broadening at high intensities in the Proton Storage Ring (PSR) at Los Alamos National Laboratory. Previous work has associated the observed broadening in the vertical direction with the coherent half integer resonance. Here, we study the effect of the space charge environment on this resonance; specifically, we investigate the strength of the resonance versus beam intensity, longitudinal bunching factor, transverse lattice tune, and two different beam injection scenarios. For each case, detailed particle-in-cell simulations are combined with experimental results to elucidate the behavior and sensitivity of the beam resonance response.
Date:
April 8, 2002
Creator:
Cousineau, S.; Holmes, J.; Galambos, J.; Macek, R.; Fedotov, A. & Wei, J.
Object Type:
Article
System:
The UNT Digital Library
Evolution of the Spallation Neutron Source Ring Lattice.
Requirements of minimum beam loss for hand-on maintenance and flexibility for future operations are essential for the lattice design of the Spallation Neutron Source (SNS) accumulator ring. During the past seven years, the lattice has evolved from an all-FODO to a FODO/doublet hybrid, the circumference has been increased to accommodate for a higher energy foreseen with a super-conducting RF linac, and the layout has evolved from an {alpha}- to an {Omega}-geometry. Extensive studies are performed to determine working points that accommodate injection painting and minimize beam losses due to space charge and resonances. In this paper, we review the evolution of the SNS ring lattice and discuss the rationales.
Date:
April 8, 2002
Creator:
Wei, J.; Catalan - Lasheras, N.; Fedotov, A.; Gardner, C. J.; Lee, Y. Y.; Papaphilippou, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
Studies Related to Chemical Mechanisms of Gas Formation in Hanford High-Level Nuclear Wastes
The objective of this work is to develop a more detailed mechanistic understanding of the thermal reactions that lead to gas production in certain high-level waste storage tanks at the Hanford, Washington site. Prediction of the combustion hazard for these wastes and engineering parameters for waste processing depend upon both a knowledge of the composition of stored wastes and the changes that they undergo as a result of thermal and radiolytic decomposition. Since 1980 when Delagard first demonstrated that gas production (H2and N2O initially, later N2 and NH3)in the affected tanks was related to oxidative degradation of metal complexants present in the waste, periodic attempts have been made to develop detailed mechanisms by which the gases were formed. These studies have resulted in the postulation of a series of reactions that account for many of the observed products, but which involve several reactions for which there is limited, or no, precedent. For example, Al(OH)4 has been postulated to function as a Lewis acid to catalyze the reaction of nitrite ion with the metal complexants, NO is proposed as an intermediate, and the ratios of gaseous products may be a result of the partitioning of NO between two or more reactions. …
Date:
April 8, 2002
Creator:
Barefield, E. Kent; Liotta, Charles L. & Neumann, Henry M.
Object Type:
Report
System:
The UNT Digital Library
Beam Transfer Lines for the Spallation Neutron Source.
Beam transfer lines for the Spallation Neutron Source (SNS) are designed to have low beam losses for hand on maintenance while satisfying the facility footprint requirements. There are two main beam transfer lines, High Energy Beam Transport (HEBT) line which connect super conducting linac to the accumulator ring and Ring to Target Beam transport (RTBT) which transfers beam from accumulator ring to the target. HEBT line not only transfer the beam from linac to ring but also prepare beam for ring injection, correct the energy jitter from the linac, provide required energy spread for the ring injection, clean the transverse and longitudinal halo particles from the beam, determine the linac beam quality, and provide the protection to the accumulator ring. RTBT line transport the beam from ring to target while fulfilling the target requirements of beam size, maximum current density, beam moment on the target in case of ring extraction kicker failure. and protect the target from the ring fault conditions.
Date:
April 8, 2002
Creator:
Raparia, D.; Lee, Y. Y.; Weng, W. T. & Wei, J.
Object Type:
Article
System:
The UNT Digital Library