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Polk County Enterprise (Livingston, Tex.), Vol. 120, No. 78, Ed. 1 Sunday, September 29, 2002
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
September 29, 2002
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 107, No. 26, Ed. 1 Friday, March 29, 2002
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 29, 2002
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 120, No. 69, Ed. 1 Thursday, August 29, 2002
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
August 29, 2002
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 107, No. 96, Ed. 1 Friday, November 29, 2002
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
November 29, 2002
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 96, No. 22, Ed. 1 Sunday, December 29, 2002
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 29, 2002
Creator:
Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 116, No. 35, Ed. 1 Thursday, August 29, 2002
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 29, 2002
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 95, No. 100, Ed. 1 Sunday, September 29, 2002
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 29, 2002
Creator:
Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Geochemistry Model Abstraction and Sensitivity Studies for the 21 PWR CSNF Waste Package
The CSNF geochemistry model abstraction, as directed by the TWP (BSC 2002b), was developed to provide regression analysis of EQ6 cases to obtain abstracted values of pH (and in some cases HCO{sub 3}{sup -} concentration) for use in the Configuration Generator Model. The pH of the system is the controlling factor over U mineralization, CSNF degradation rate, and HCO{sub 3}{sup -} concentration in solution. The abstraction encompasses a large variety of combinations for the degradation rates of materials. The ''base case'' used EQ6 simulations looking at differing steel/alloy corrosion rates, drip rates, and percent fuel exposure. Other values such as the pH/HCO{sub 3}{sup -} dependent fuel corrosion rate and the corrosion rate of A516 were kept constant. Relationships were developed for pH as a function of these differing rates to be used in the calculation of total C and subsequently, the fuel rate. An additional refinement to the abstraction was the addition of abstracted pH values for cases where there was limited O{sub 2} for waste package corrosion and a flushing fluid other than J-13, which has been used in all EQ6 calculation up to this point. These abstractions also used EQ6 simulations with varying combinations of corrosion rates of …
Date:
October 29, 2002
Creator:
Bernot, P.; LeStrange, S.; Thomas, E.; Zarrabi, K. & Arthur, S.
Object Type:
Report
System:
The UNT Digital Library
Extended defects and polarity of hydride vapor phase epitaxy GaN
None
Date:
April 29, 2002
Creator:
Jasinski, J. & Liliental-Weber, Z.
Object Type:
Article
System:
The UNT Digital Library
Thermal Conductivity of the Potential Repository Horizon Model Report
The purpose of this report is to assess the spatial variability and uncertainty of thermal conductivity in the host horizon for the proposed repository at Yucca Mountain. More specifically, the lithostratigraphic units studied are located within the Topopah Spring Tuff (Tpt) and consist of the upper lithophysal zone (Tptpul), the middle nonlithophysal zone (Tptpmn), the lower lithophysal zone (Tptpll), and the lower nonlithophysal zone (Tptpln). The Tptpul is the layer directly above the repository host layers, which consist of the Tptpmn, Tptpll, and the Tptpln. Current design plans indicate that the largest portion of the repository will be excavated in the Tptpll (Board et al. 2002 [157756]). The main distinguishing characteristic among the lithophysal and nonlithophysal units is the percentage of large scale (cm-m) voids within the rock. The Tptpul and Tptpll, as their names suggest, have a higher percentage of lithophysae than the Tptpmn and the Tptpln. Understanding the influence of the lithophysae is of great importance to understanding bulk thermal conductivity and perhaps repository system performance as well. To assess the spatial variability and uncertainty of thermal conductivity, a model is proposed that is functionally dependent on the volume fraction of lithophysae and the thermal conductivity of the …
Date:
August 29, 2002
Creator:
Ramsey, J.
Object Type:
Report
System:
The UNT Digital Library
A study of layered lithium manganese oxide cathode materials
None
Date:
July 29, 2002
Creator:
Eriksson, Tom A. & Doeff, Marca M.
Object Type:
Article
System:
The UNT Digital Library
A corrected and generalized successive random additions algorithm for simulating fractional levy motions
Simulation of subsurface heterogeneity is important for modeling subsurface flow and transport processes. Previous studies have indicated that subsurface property variations can often be characterized by fractional Brownian motion (fBm) or (truncated) fractional Levy motion (fLm). Because Levy-stable distributions have many novel and often unfamiliar properties, studies on generating fLm distributions are rare in the literature. In this study, we generalize a relatively simple and computationally efficient successive random additions (SRA) algorithm, originally developed for generating Gaussian fractals, to simulate fLm distributions. We also propose an additional important step in response to continued observations that the traditional SRA algorithm often generates fractal distributions having poor scaling and correlation properties. Finally, the generalized and modified SRA algorithm is validated through numerical tests.
Date:
May 29, 2002
Creator:
Liu, Hui-Hai; Bodvarsson, Gudmundur S.; Lu, Silong & Molz, Fred J.
Object Type:
Article
System:
The UNT Digital Library
Surface structural analysis of LiF(100) thin films grown on Pt(111)
The surface structure of a multilayer LiF(100) thin film grown on Pt(111) from the vapor has been determined by the automated tensor low energy electron diffraction (LEED) method. The final structure, which refined to a Pendry R-factor (RP) of 0.24, had a surface corrugation (D1) of 0.24+-0.04 Angstrom due to the Li+ being displaced towards the bulk, leaving the initially coplanar F - unshifted. A similar intralayer corrugation due to the movement of the Li+ was also observed in the layer immediately under the surface layer, although to a lesser degree: D2=0.07+-0.04 Angstrom. This asymmetric relaxation resulted in the reduction of the first interlayer spacing, d(F2-Li1), to 1.77+-0.0 6 Angstrom from the ideal value of 2.01 Angstrom. The second interlayer spacing, d(Li3-F2), was within error bars of the bulk value, 2.01 Angstrom.
Date:
August 29, 2002
Creator:
Roberts, J.G.; Van Hove, M.A. & Somorjai, G.A.
Object Type:
Article
System:
The UNT Digital Library
High Energy Physics division semiannual report of research activities.
This report describes the research conducted in the High Energy Physics Division of Argonne National Laboratory during the period of July 1, 2001 through December 31, 2001. Topics covered here include experimental and theoretical particle physics, advanced accelerator physics, detector development, and experimental facilities research. Lists of Division publications and colloquia are included.
Date:
August 29, 2002
Creator:
Spinka, H. M.; Nodulman, L. J.; Goodman, M. C.; Repond, J.; Ayres, D. S.; Proudfoot, J. et al.
Object Type:
Report
System:
The UNT Digital Library
Microscopic probabilistic model for the simulation of secondary electron emission
We provide a detailed description of a model and its computational algorithm for the secondary electron emission process. The model is based on a broad phenomenological fit to data for the secondary emission yield (SEY) and the emitted-energy spectrum. We provide two sets of values for the parameters by fitting our model to two particular data sets, one for copper and the other one for stainless steel.
Date:
July 29, 2002
Creator:
Furman, M. A. & Pivi, M. T. F.
Object Type:
Article
System:
The UNT Digital Library
Overview of the nearby supernova factory
The Nearby Supernova Factory (SNfactory) is an international experiment designed to lay the foundation for the next generation of cosmology experiments (such as CFHTLS, wP, SNAP and LSST) which will measure the expansion history of the Universe using Type Ia supernovae. The SNfactory will discover and obtain frequent lightcurve spectrophotometry covering 3200-10000 {angstrom} for roughly 300 Type Ia supernovae at the low-redshift end of the smooth Hubble flow. The quantity, quality, breadth of galactic environments, and homogeneous nature of the SNfactory dataset will make it the premier source of calibration for the Type Ia supernova width-brightness relation and the intrinsic supernova colors used for K-correction and correction for extinction by host-galaxy dust. This dataset will also allow an extensive investigation of additional parameters which possibly influence the quality of Type Ia supernovae as cosmological probes. The SNfactory search capabilities and follow-up instrumentation include wide-field CCD imagers on two 1.2-m telescopes (via collaboration with the Near Earth Asteroid Tracking team at JPL and the QUEST team at Yale), and a two-channel integral-field-unit optical spectrograph/imager being fabricated for the University of Hawaii 2.2-m telescope. In addition to ground-based follow-up, UV spectra for a subsample of these supernovae will be obtained with HST. …
Date:
July 29, 2002
Creator:
Aldering, Greg; Adam, Gilles; Antilogus, Pierre; Astier, Pierre; Bacon, Roland; Bongard, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Flow Tones in a Pipeline-Cavity System: Effect of Pipe Asymmetry
Flow tones in a pipeline-cavity system are characterized in terms of unsteady pressure within the cavity and along the pipe. The reference case corresponds to equal lengths of pipe connected to the inlet and outlet ends of the cavity. Varying degrees of asymmetry of this pipe arrangement are investigated. The asymmetry is achieved by an extension of variable length, which is added to the pipe at the cavity outlet. An extension length as small as a few percent of the acoustic wavelength of the resonant mode can yield a substantial reduction in the pressure amplitude of the flow tone. This amplitude decrease occurs in a similar fashion within both the cavity and the pipe resonator, which indicates that it is a global phenomenon. Furthermore, the decrease of pressure amplitude is closely correlated with a decrease of the Q (quality)-factor of the predominant spectral component of pressure. At a sufficiently large value of extension length, however, the overall form of the pressure spectrum recovers to the form that exists at zero length of the extension. Further insight is provided by variation of the inflow velocity at selected values of extension length. Irrespective of its value, both the magnitude and frequency of …
Date:
May 29, 2002
Creator:
Erdem, D.; rockwell, D.; Oshkai, P. & Pollack, M.
Object Type:
Report
System:
The UNT Digital Library
Methods of Improving Internal-TIN Nb{sub 3}Sn for Fusion Applications
Development of a more reliable and economical high field material for ITER and TPX as well as LDK and KSTAR programs. The overall objective of this work is to provide the TPX/ITER programs and similar projects with an improved, reliable and economical high field Nb{sub 3}Sn multifilamentary conductor strand made by the internal-tin process. An effort will also be made to determine the reasons for the property changes taking place after various heat treatment cycles in an effort to develop optimized heat treatments for the various applications.
Date:
August 29, 2002
Creator:
Pyon, T & Gregory, E.
Object Type:
Report
System:
The UNT Digital Library
CO{sub 2}-H{sub 2}O mixtures in the geologic sequestration of CO{sub 2}. I. Assessment and calculation of mutual solubilities from 12 to 100 degrees C and up to 600 bar
None
Date:
July 29, 2002
Creator:
Spycher, Nicolas; Pruess, Karsten & Ennis-King, Jonathan
Object Type:
Article
System:
The UNT Digital Library
High resolution XPS study of oxide layers grown on Ge substrates
High resolution X-ray Photoelectron Spectroscopy (XPS) was used to analyze thin layers of germanium oxide grown on germanium substrates under various conditions. The results reveal the presence of high density of electron states located at the oxide/germanium interface that lead to the energy band bending. The surface of native oxide layers and that of thin oxide layer grown under dry oxygen correspond to GeO2 composition. Under Ar etching, lower oxidation states were revealed. Short in-situ heat treatment at T=400 degrees C under ultra high vacuum leads to the removal of the oxide layer. In addition, the analysis of the layer grown at T=380 degrees C under dry oxygen suggest that carbides form at the oxide/substrate interface.
Date:
July 29, 2002
Creator:
Tabet, N.; Faiz, M.; Hamdan, N.M. & Hussain, Z.
Object Type:
Article
System:
The UNT Digital Library
Probing the gateway to superheavy nuclei in cranked relativistic Hartree-Bogoliubov theory.
The cranked relativistic Hartree+Bogoliubov theory has been applied for a systematic study of the nuclei around {sup 264}No, the heaviest nuclei for which detailed spectroscopic data are available. The deformation, rotational response, pairing correlations, quasi-particle and other properties of these nuclei have been studied with different relativistic mean field (RMF) parametrizations. For the first time, the quasi-particle spectra of odd deformed nuclei have been calculated in a fully self-consistent way within the framework of the RMF theory. The energies of the spherical subshells, from which active deformed states of these nuclei emerge, are described with an accuracy better than 0.5 MeV for most of the subshells with the NL1 and NL3 parametrizations. However, for a few subshells the discrepancy reach 0.7-1.0 MeV. The implications of these results for the study of superheavy nuclei are discussed.
Date:
August 29, 2002
Creator:
Afanasjev, A. V.; Khoo, T. L.; Frauendorf, S.; Lalazissis, G. A. & Ahmad, I.
Object Type:
Article
System:
The UNT Digital Library
Cryogenic Treatment of Production Components in High-Wear Rate Wells
Deep Cryogenic Tempering (DCT) is a specialized process whereby the molecular structure of a material is ''re-trained'' through cooling to -300 F and then heating to +175-1100 F. Cryocon, Inc. (hereafter referred to as Cryocon) and RMOTC entered an agreement to test the process on oilfield production components, including rod pumps, rods, couplings, and tubing. Three Shannon Formation wells were selected (TD about 500 ft) based on their proclivity for high component wear rates. Phase 1 of the test involved operation for a nominal 120 calendar day period with standard, non-treated components. In Phase 2, treated components were installed and operated for another nominal 120 calendar day period. Different cryogenic treatment profiles were used for components in each well. Rod pumps (two treated and one untreated) were not changed between test phases. One well was operated in pumped-off condition, resulting in abnormal wear and disqualification from the test. Testing shows that cryogenic treatment reduced wear of rods, couplers, and pump barrels. Testing of production tubing produced mixed results.
Date:
April 29, 2002
Creator:
Milliken, M.
Object Type:
Report
System:
The UNT Digital Library
Heavy-ion linac development for the U.S. RIA project.
The Nuclear Science Community in the Unites States has unanimously concluded that developments in both nuclear science and its supporting technologies make building a world-leading Rare-Isotope Accelerator (RIA) facility for production of radioactive beams the top priority. The RIA development effort involves several US Laboratories (ANL, JLAB, LBNL, MSU, ORNL). The RIA Facility includes a CW 1.4 GeV driver linac and a 100 MV post-accelerator both based on superconducting (SC) cavities operating at frequencies from 48 MHz to 805 MHz. An initial acceleration in both linacs is provided by room temperature RFQs. The driver linac is designed for acceleration of any ion species; from protons up to 900 MeV to uranium up to 400 MeV/u. The novel feature of the driver linac is an acceleration of multiple charge-state heavy-ion beams in order to achieve 400 kW beam power. Basic design concepts of the driver linac are given. Several new conceptual solutions in beam dynamics, room temperature and SC accelerating structures for heavy ion accelerator applications are discussed.
Date:
January 29, 2002
Creator:
Ostroumov, P. N.
Object Type:
Article
System:
The UNT Digital Library
Ferroelectric Cathodes in Transverse Magnetic Fields
Experimental investigations of a planar ferroelectric cathode in a transverse magnetic field up to 3 kGs are presented. It is shown that the transverse magnetic field affects differently the operation of ferroelectric plasma cathodes in ''bright'' and ''dark'' modes in vacuum. In the ''bright'' mode, when the surface plasma is formed, the application of the transverse magnetic field leads to an increase of the surface plasma density. In the ''dark'' mode, the magnetic field inhibits the development of electron avalanches along the surface, as it does similarly in other kinds of surface discharges in the pre-breakdown mode.
Date:
July 29, 2002
Creator:
Dunaevsky, Alexander; Raitses, Yevgeny & Fisch, Nathaniel J.
Object Type:
Report
System:
The UNT Digital Library