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15th Street News (Midwest City, Okla.), Vol. 29, No. 13, Ed. 1 Friday, December 10, 1999
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 10, 1999
Creator:
Ming, Holly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Achieving high sustained performance in an unstructured mesh CFD application
This paper highlights a three-year project by an interdisciplinary team on a legacy F77 computational fluid dynamics code, with the aim of demonstrating that implicit unstructured grid simulations can execute at rates not far from those of explicit structured grid codes, provided attention is paid to data motion complexity and the reuse of data positioned at the levels of the memory hierarchy closest to the processor, in addition to traditional operation count complexity. The demonstration code is from NASA and the enabling parallel hardware and (freely available) software toolkit are from DOE, but the resulting methodology should be broadly applicable, and the hardware limitations exposed should allow programmers and vendors of parallel platforms to focus with greater encouragement on sparse codes with indirect addressing. This snapshot of ongoing work shows a performance of 15 microseconds per degree of freedom to steady-state convergence of Euler flow on a mesh with 2.8 million vertices using 3072 dual-processor nodes of ASCI Red, corresponding to a sustained floating-point rate of 0.227 Tflop/s.
Date:
December 10, 1999
Creator:
Keyes, D E; Anderson, W K; Gropp, W D; Kaushik, D K & Smith, B F
Object Type:
Article
System:
The UNT Digital Library
Air Force Depot Maintenance: Analysis of Its Financial Operations
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the financial operations of the Air Force depot maintenance activity group, focusing on the: (1) Air Force depot maintenance activity group's price increase between fiscal year (FY) 1994 and FY 1999 and the primary reasons for it; (2) activity group's financial losses during FY 1994 through FY 1998 and the primary reasons for them; and (3) Air Force's methods for recovering these losses."
Date:
December 10, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 100, No. 227, Ed. 1 Friday, December 10, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 10, 1999
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Appropriations for FY2000: Foreign Operations, Export Financing, and Related Programs
Appropriations are one part of a complex federal budget process that includes budget resolutions, appropriations (regular, supplemental, and continuing) bills, rescissions, and budget reconciliation bills. This report is a guide to one of the 13 regular appropriations bills that Congress passes each year. It is designed to supplement the information provided by the House and Senate Foreign Operations Appropriations Subcommittees.
Date:
December 10, 1999
Creator:
Nowels, Larry
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 35, Ed. 1 Friday, December 10, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 94, No. 99, Ed. 1 Friday, December 10, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 1999
Creator:
Keasling, Edna & Fierro, Jennifer
Object Type:
Newspaper
System:
The Portal to Texas History
Characterization of electrical resistivity as a function of temperature in the Mo-Si-B system
Measurements of electrical resistivity as a function of temperature from 25 to 1,500 C were conducted on polycrystalline samples in the Mo-Si-B system. Single phase, or nearly single phase, samples were prepared for the following phases: Mo{sub 3}Si, Mo{sub 5}SiB{sub 2}, Mo{sub 5}Si{sub 3}B{sub x}, MoB, MoSi{sub 2}, and Mo{sub 5}Si{sub 3}. Thesis materials all exhibit resistivity values within a narrow range(4--22 x 10{sup {minus}7}{Omega}-m), and the low magnitude suggests these materials are semi-metals or low density of states metals. With the exception of MoSi{sub 2}, all single phase materials in this study were also found to have low temperature coefficient of resistivity(TCR) values. These values ranged from 2.10 x 10{sup {minus}10} to 4.74 x 10{sup {minus}10}{Omega}-m/{degree} C, and MoSi{sub 2} had a TCR of 13.77 x 10{sup {minus}10}{Omega}-m/{degree} C. The results from the single phase sample measurements were employed in a natural log rule-of-mixtures model to relate the individual phase resistivity values to those of multiphase composites. Three Mo-Si-B phase regions were analyzed: the binary Mo{sub 5}Si{sub 3}-MoSi{sub 2} system, the ternary phase field Mo{sub 5}Si{sub 3}B{sub x}MoB-MoSi{sub 2}, and the Mo{sub 3}Si-Mo{sub 5}SiB{sub 2}-Mo{sub 5} Si{sub 3}B{sub x} ternary region. The experimental data for samples in each of …
Date:
December 10, 1999
Creator:
Beckman, Sarah E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 104, No. 99, Ed. 1 Friday, December 10, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Confinement of Pure Ion Plasma in a Cylindrical Current Sheet
A novel method for containing a pure ion plasma at thermonuclear densities and temperatures has been modeled. The method combines the confinement properties of a Penning-Malmberg trap and some aspects of the magnetic field geometry of a pulsed theta-pinch. A conventional Penning trap can confine a uniform-density plasma of about 5x1011 cm-3 with a 30-Tesla magnetic field. However, if the axial field is ramped, a much higher local ion density can be obtained. Starting with a 107 cm-3 trapped deuterium plasma in a conventional Penning-Malmberg trap at the Brillouin limit (B = 0.6 Tesla), the field is ramped to 30 Tesla. Because the plasma is comprised of particles of only one sign of charge, transport losses are very low, i.e., the conductivity is high. As a result, the ramped field does not penetrate the plasma and a diamagnetic surface current is generated, with the ions being accelerated to relativistic velocities. To counteract the inward j x B forces from this induced current, additional ions are injected into the plasma along the axis to increase the density (and mutual electrostatic repulsion) of the target plasma. In the absence of the higher magnetic field in the center, the injected ions drift outward …
Date:
December 10, 1999
Creator:
Phillips, C.K.; Chao, E.H.; Davidson, R.C. & Paul, S.F.
Object Type:
Report
System:
The UNT Digital Library
Corrosion of Candidate Container Materials by Yucca Mountain Bacteria
Several candidate container materials have been studied in modified Yucca Mountain (YM) ground water in the presence or absence of YM bacteria. YM bacteria increased corrosion rates by 5-6 fold in UNS G10200 carbon steel, and nearly 100-fold in UNS NO4400 Ni-Cu alloy. YM bacteria caused microbiologically influenced corrosion (MIC) through de-alloying or Ni-depletion of Ni-Cu alloy as evidenced by scanning electronic microscopy (SEM) and inductively coupled plasma spectroscopy (ICP) analysis. MIC rates of more corrosion-resistant alloys such as UNS NO6022 Ni-Cr- MO-W alloy, UN's NO6625 Ni-Cr-Mo alloy, and UNS S30400 stainless steel were measured below 0.05 umyr, however YM bacteria affected depletion of Cr and Fe relative to Ni in these materials. The chemical change on the metal surface caused by depletion was characterized in anodic polarization behavior. The anodic polarization behavior of depleted Ni-based alloys was similar to that of pure Ni. Key words: MIC, container materials, YM bacteria, de-alloying, Ni-depletion, Cr-depletion, polarization resistance, anodic polarization,
Date:
December 10, 1999
Creator:
Horn, Joanne; Jones, Denny; Lian, Tiangan; Martin, Sue & Rivera, Angel
Object Type:
Article
System:
The UNT Digital Library
Dallas Voice (Dallas, Tex.), Vol. 16, No. 32, Ed. 1 Friday, December 10, 1999
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
December 10, 1999
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
The Department of Energy’s Spallation Neutron Source Project: Description and Issues
This report describes the SNS's management, project costs, schedule, site selection, and funding, and discusses issues raised by some congressional critics of the project, such as management problems, potential cost overruns, and schedule delays.
Date:
December 10, 1999
Creator:
Barth, Kai-Henrik
Object Type:
Report
System:
The UNT Digital Library
Design and operations of Hall thruster with segmented electrodes
Principles of the Hall thruster with segmented electrodes are explored. A suitable vacuum facility was put into service. For purposes of comparison between segmented and conventional thruster approaches, a modular laboratory prototype thruster was designed and built. Under conventional operation, the thruster achieves state-of-the-art efficiencies (56% at 300 V and 890 W). Very preliminary results under operation with segmented electrodes are also described.
Date:
December 10, 1999
Creator:
Fisch, N. J.; Raitses, Y.; Dorf, L. A. & Litvak, A. A.
Object Type:
Report
System:
The UNT Digital Library
Development and evaluation of high resolution quadrupole mass analyzer and an inductively coupled plasma-Mach disk
By definition a plasma is an electrically conducting gaseous mixture containing a significant concentration of cations and electrons. The Inductively Coupled Plasma (ICP) is an electrodeless discharge in a gas at atmospheric pressure. This discharge is an excellent one for vaporizing, atomizing, and ionizing elements. The early development of the ICP began in 1942 by Babat and then by Reed in the early 1960s. This was then followed by the pioneering work of Fassel and coworkers in the late 1960s. Commercial ICP spectrometers were introduced in the mid 1970s. A major breakthrough in the area of ICP took place in the early 1980s when the ICP was shown to be an excellent ion source for mass spectrometry.
Date:
December 10, 1999
Creator:
Amad, Ma'an Hazem
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Drift Wave Simulations with Reduced Stellarator Equilibria
A three-field model to study drift-resistive, low-frequency waves in low-beta, non-axisymmetric plasmas [J.L.V. Lewandowski, Phys. Plasmas, 4 (11) 4023 (1997)] is used to analyze the effect of the inhomogeneities in the stellarator magnetic field on the fastest (linear) growth rate, gamma. Extensive numerical calculations for a toroidal heliac show that not all Fourier components in the representation of the equilibrium configuration are important as far as gamma is concerned.
Date:
December 10, 1999
Creator:
Lewandowski, J.L.V.
Object Type:
Report
System:
The UNT Digital Library
Effect of Sawtooth Oscillations on Energetic Ions
The work summarizes results of the authors' studies on the energetic ion transport induced by sawtooth oscillations in tokamaks. The main attention is paid to description of physical mechanisms responsible for the transport. In addition to overview, the work contains new material. The new results concern the resonant interaction of the particles and the electromagnetic field of the sawtooth crash. In particular, it is discovered that the dominant harmonic of the crash (m = n = 1) can lead to stochastic motion of particles having large orbit width (potatoes). Regular motion of potatoes and quasi-stagnation particles in the presence of an n = 1 mode is studied, and their characteristic displacements associated with quick switching on/off the mode are found.
Date:
December 10, 1999
Creator:
White, R. B.; Lutsenko, V. V.; Kolesnichenko, Ya. I. & Yakovenko, Yu. V.
Object Type:
Report
System:
The UNT Digital Library
Electrochemical and scanning probe microscopic characterization of spontaneously adsorbed organothiolate monolayers at gold
This dissertation presented several results which add to the general knowledge base regarding organothiolates monolayer spontaneously adsorbed at gold films. Common to the body of this work is the use of voltammetric reductive resorption and variants of scanning probe microscopy to gain insight into the nature of the monolayer formation process as well as the resulting interface. The most significant result from this work is the success of using friction force microscopy to discriminate the end group orientation of monolayer chemisorbed at smooth gold surfaces with micrometer resolution (Chapter 4). The ability to detect the differences in the orientational disposition is demonstrated by the use PDMS polymer stamp to microcontact print an adlayer of n-alkanethiolate of length n in a predefine pattern onto a gold surface, followed by the solution deposition of a n-alkanethiol of n {+-} 1 to fill in the areas on the gold surface intentionally not coated by the stamping process. These two-component monolayers can be discriminated by using friction force microscopy which detects differences in friction contributed by the differences in the orientation of the terminal groups at surfaces. This success has recently led to the detection of the orientation differences at nanometer scale. Although the …
Date:
December 10, 1999
Creator:
Wong, Sze-Shun Season
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An example of a United States Nuclear Research Center
Under the likely scenario in which public support for nuclear energy remains low and fossil fuels continue to be abundant and cheap, government supported nuclear research centers must adapt their missions to ensure that they tackle problems of current significance. It will be critical to be multidisciplinary, to generate economic value, and to apply nuclear competencies to current problems. Addressing problems in nuclear safety, D and D, nuclear waste management, nonproliferation, isotope production are a few examples of current needs in the nuclear arena. Argonne's original mission, to develop nuclear reactor technology, was a critical need for the U.S. in 1946. It would be wise to recognize that this mission was a special instance of a more general one--to apply unique human and physical capital to long term, high risk technology development in response to society's needs. International collaboration will enhance the collective chances for success as the world moves into the 21st century.
Date:
December 10, 1999
Creator:
Bhattacharyya, S. K.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Friday, December 10, 1999
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 10, 1999
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Fast methods for analysis of neurotransmitters from single cell and monitoring their releases in central nervous system by capillary electrophoresis, fluorescence microscopy and luminescence imaging
Fast methods for separation and detection of important neurotransmitters and the releases in central nervous system (CNS) were developed. Enzyme based immunoassay combined with capillary electrophoresis was used to analyze the contents of amino acid neurotransmitters from single neuron cells. The release of amino acid neurotransmitters from neuron cultures was monitored by laser induced fluorescence imaging method. The release and signal transduction of adenosine triphosphate (ATP) in CNS was studied with sensitive luminescence imaging method. A new dual-enzyme on-column reaction method combined with capillary electrophoresis has been developed for determining the glutamate content in single cells. Detection was based on monitoring the laser-induced fluorescence of the reaction product NADH, and the measured fluorescence intensity was related to the concentration of glutamate in each cell. The detection limit of glutamate is down to 10{sup {minus}8} M level, which is 1 order of magnitude lower than the previously reported detection limit based on similar detection methods. The mass detection limit of a few attomoles is far superior to that of any other reports. Selectivity for glutamate is excellent over most of amino acids. The glutamate content in single human erythrocyte and baby rat brain neurons were determined with this method and results …
Date:
December 10, 1999
Creator:
Wang, Ziqiang
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Fast Particle Destabilization of Toroidicity Induced Alfven Eigenmodes in National Spherical Torus Experiment
Toroidicity induced Alfven Eigenmode (TAE) stability in National Spherical Torus Experiment (NSTX) is analyzed using the improved NOVA-K code, which includes finite orbit width and Larmor radius effects and is able to predicts the saturation amplitude for the mode using the quasilinear theory. Broad spectrum of unstable global TAEs with different toroidal mode numbers is predicted. Due to the strong poloidal field and the presence of the magnetic well in NSTX better particle confinement in the presence of TAEs in comparison with tokamaks is illustrated making use of the ORBIT code.
Date:
December 10, 1999
Creator:
Cheng, C. Z.; Fu, G. Y.; Gorelenkova, M. V.; Gorelenkov, N. N.; White, R. & Kaye, S.
Object Type:
Report
System:
The UNT Digital Library
Federal Facilities: Alternative Land Uses Could Save Water at Fallon Naval Air Station, Nevada
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on alternative land uses that could save water at Fallon Naval Air Station, Nevada, focusing on: (1) the aviation safety and operational requirements for the runway protection zone at Fallon Naval Air Station (NAS); (2) the alternative land use strategies Fallon NAS identified in response to congressional direction and how it evaluated them; and (3) the land use strategies at five military facilities and two commercial airports that operate in similar environments."
Date:
December 10, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Final Report: Collider Physics, April 1, 1995 - March 31, 1999
This report summarizes the work done on Grant DE-FG03-95ER40916 over the period April 1, 1995 through March 31, 1999. Detailed progress have been submitted for the years through March 31, 1999. The primary project during this period was the D0 experiment at Fermilab and is discussed first. The last year of the period was an extension to complete the study of laser induced fluorescence in neon. This work is discussed in the section ''Detector R and D''.
Date:
December 10, 1999
Creator:
White, James T.
Object Type:
Report
System:
The UNT Digital Library