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The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 32, Ed. 1 Thursday, November 8, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 8, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 33, Ed. 1 Thursday, November 15, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 15, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 34, Ed. 1 Thursday, November 22, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 22, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 35, Ed. 1 Thursday, November 29, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 29, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 36, Ed. 1 Thursday, December 6, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 6, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 37, Ed. 1 Thursday, December 13, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 13, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 38, Ed. 1 Thursday, December 20, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 20, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 39, Ed. 1 Thursday, December 27, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 27, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
X-ray and vibrational spectroscopy of manganese complexes relevant to the oxygen-evolving complex of photosynthesis
Manganese model complexes, relevant to the oxygen-evolving complex (OEC) in photosynthesis, were studied with Mn K-edge X-ray absorption near-edge spectroscopy (XANES), Mn Kb X-ray emission spectroscopy (XES), and vibrational spectroscopy. A more detailed understanding was obtained of the influence of nuclearity, overall structure, oxidation state, and ligand environment of the Mn atoms on the spectra from these methods. This refined understanding is necessary for improving the interpretation of spectra of the OEC. Mn XANES and Kb XES were used to study a di-(mu)-oxo and a mono-(mu)-oxo di-nuclear Mn compound in the (III,III), (III,IV), and (IV,IV) oxidation states. XANES spectra show energy shifts of 0.8 - 2.2 eV for 1-electron oxidation-state changes and 0.4 - 1.8 eV for ligand-environment changes. The shifts observed for Mn XES spectra were approximately 0.21 eV for oxidation state-changes and only approximately 0.04 eV for ligand-environment changes. This indicates that Mn Kb XES i s more sensitive to the oxidation state and less sensitive to the ligand environment of the Mn atoms than XANES. These complimentary methods provide information about the oxidation state and the ligand environment of Mn atoms in model compounds and biological systems. A versatile spectroelectrochemical apparatus was designed to aid the interpretation …
Date:
May 16, 2001
Creator:
Visser, Hendrik
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
X-Ray Dose and Spot Size Calculations for the DARHT-II Distributed Target
The baseline DARHT-II converter target consists of foamed tantalum within a solid-density cylindrical tamper. The baseline design has been modified by D. Ho to further optimize the integrated line density of material in the course of multiple beam pulses. LASNEX simulations of the hydrodynamic expansion of the target have been performed by D. Ho (documented elsewhere). The resulting density profiles have been used as inputs in the MCNP radiation transport code to calculate the X-ray dose and spot size assuming a incoming Gaussian electron beam with {sigma} = 0.65mm, and a PIC-generated beam taking into account the ''swept'' spot emerging from the DARHT-II kicker system. A prerequisite to these calculations is the absorption spectrum of air. In order to obtain this, a separate series of MCNP runs was performed for a set of monoenergetic photon sources, tallying the energy deposited in a volume of air. The forced collision feature was used to improve the statistics since the photon mean free path in air is extremely long at the energies of interest. A sample input file is given below. The resulting data for the MCNP DE and DF cards is shown in the beam-pulse input files, one of which is listed …
Date:
April 5, 2001
Creator:
McCarrick, J
Object Type:
Report
System:
The UNT Digital Library
X-ray Magnetic Linear Dichroism of Fe-Ni Alloys on Cu(111)
We have prepared Fe{sub x}Ni{sub 1-x} multilayers on Cu(111) in order to learn how to control the structure and magnetism of these thin alloy films, which are relevant to the giant magnetoresistance (GMR) effect used in magnetic disk drive heads. Using the Spectromicroscopy Facility (7.0.1.2) on Undulator Beamline 7.0 at the Advanced Light Source, we have measured X-ray magnetic linear dichroism (XMLD) signals from both Fe and Ni 3p lines for fourteen different thin Ni-Fe alloy films on Cu(111), with Fe concentration ranging from 9% to 84% and for a variety of film thicknesses. The Curie temperature for all of these samples was in the range 200K to 500K. For many of these films, the Curie temperature was considerably lower than was previously seen for similar films deposited on Cu(100). For a particular Fe concentration x, the Curie temperature increases with alloy film thickness. For a specific film thickness, the Curie temperature has a maximum near x {approx} 0.4.
Date:
April 1, 2001
Creator:
Johnson, T F; Chiang, S; Sato, Y; Arena, D. A.; Morton, S. A.; Hochstrasser, M. et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray Measurements of a Thermo Scientific P385 DD Neutron Generator
Idaho National Laboratory is experimenting with electrical neutron generators, as potential replacements for californium-252 radioisotopic neutron sources in its PINS prompt gamma-ray neutron activation analysis (PGNAA) system for the identification of military chemical warfare agents and explosives. In addition to neutron output, we have recently measured the x-ray output of the Thermo Scientific P385 deuterium-deuterium neutron generator. X-rays are a normal byproduct from a neutron generator and depending on their intensity and energy they can interfere with gamma rays from the object under test, increase gamma-spectrometer dead time, and reduce PGNAA system throughput. The P385 x-ray energy spectrum was measured with a high-purity germanium (HPGe) detector, and a broad peak is evident at about 70 keV. To identify the source of the x-rays within the neutron generator assembly, it was scanned by collimated scintillation detectors along its long axis. At the strongest x-ray emission points, the generator also was rotated 60° between measurements. The scans show the primary source of x-ray emission from the P385 neutron generator is an area 60 mm from the neutron production target, in the vicinity of the ion source. Rotation of the neutron generator did not significantly alter the x-ray count rate, and the x-ray …
Date:
August 1, 2001
Creator:
Seabury, E. H.; Chichester, D. L.; Caffrey, A. J.; Simpson, J.; Lemchak, M. & Wharton, C. J.
Object Type:
Article
System:
The UNT Digital Library
X-ray microimaging by diffractive techniques
The report summarizes the development of soft x-ray microscopes at the National Synchrotron Light Source X-1A beamline. We have developed a soft x-ray microscopy beamline (X-1A) at the National Synchrotron Light Source at Brookhaven National Laboratory. This beamline has been upgraded recently to provide two endstations dedicated to microscopy experiments. One endstation hosts a brand new copy of the redesigned room temperature scanning x-ray microscope (STXM), and the other end station hosts a cryo STXM and the original redesigned room temperature microscope, which has been commissioned and has started operation. Cryo STXM and the new microscope use the same new software package, running under the LINUX operating system. The new microscope is showing improved image resolution and extends spectromicroscopy to the nitrogen, oxygen and iron edges. These microscopes are used by us, and by users of the facility, to image hydrated specimens at 50 nm or better spatial resolution and with 0.1-0.5 eV energy resolution. This allows us to carry out chemical state mapping in biological, materials science, and environmental and colloidal science specimens. In the cryo microscope, we are able to do chemical state mapping and tomography of frozen hydrated specimens, and this is of special importance for radiation-sensitive …
Date:
July 31, 2001
Creator:
Kirz, Janos & Jacobsen, Chris
Object Type:
Report
System:
The UNT Digital Library
X-ray Optics and Diagnostics for the First Experiments on the Linac Coherent Light Source
The Linac Coherent Light Source (LCLS) is a 1.5 to 15 {angstrom}-wavelength free-electron laser (FEL), currently proposed for the Stanford Linear Accelerator Center (SLAC). The photon output consists of high brightness, transversely coherent pulses with duration < 300 fs, together with a broad spontaneous spectrum with total power comparable to the coherent output. The output fluence, and pulse duration, pose special challenges for optical component and diagnostic designs. We discuss some of the proposed solutions, and give specific examples related to the planned initial experiments.
Date:
June 13, 2001
Creator:
Wootton, A.; Arthur, J.; Barbee, T.; Bionta, R.; London, R.; Park, H. S. et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray photoemission electron microscopy, a tool for the investigation of complex magnetic structures.
X-ray Photoemission Electron Microscopy unites the chemical specificity and magnetic sensitivity of soft x-ray absorption techniques with the high spatial resolution of electron microscopy. The discussed instrument possesses a spatial resolution of better than 50 nm and is located at a bending magnet beamline at the Advanced Light Source, providing linearly and circularly polarized radiation between 250 and 1300 eV. We will present examples which demonstrate the power of this technique applied to problems in the field of thin film magnetism. The chemical and elemental specificity is of particular importance for the study of magnetic exchange coupling because it allows separating the signal of the different layers and interfaces in complex multi-layered structures.
Date:
August 30, 2001
Creator:
Scholl, Andreas; Ohldag, Hendrik; Nolting, Frithjof; Stohr, Joachim & Padmore, Howard A.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Spectropolarimetry Studies at the Nevada Terawatt Facility and LLNL EBIT
Recent results from x-pinches at the NTF provide experimental evidence for the existence of strong electron beams in x-pinch plasmas and motivate the development of a new diagnostic, x-ray spectropolarimetry, for investigating the anisotropy of such plasmas. This diagnostic is based on theoretical modeling of polarization-dependent spectra measured simultaneously by spectrometers with different sensitivity to polarization. Results of the first polarization-sensitive experiments at the NTF are presented. K-shell emission from Ti x-pinches is recorded simultaneously by two identical spectrometers with the dispersion plane perpendicular and parallel to the discharge axis. The spectroscopic analysis of more than eight Ti x-pinch shots show how spectropolarimetry complements the usual diagnostics of a z-pinch plasma. The polarization-sensitive spectra, generated by a Maxwellian electron beam at LLNL EBIT have been collected and analyzed. These data make an important contribution to the plasma polarization spectroscopy program at the NTF. In particular, the study of multiply-charged Ti ion spectra help in the interpretation of the polarization-sensitive spectra from Ti x-pinches at the NTF.
Date:
October 20, 2001
Creator:
Shlyaptseva, A S; Kantsyrev, V L; Bauer, B S; Neill, P; Harris, C; Fedin, D A et al.
Object Type:
Article
System:
The UNT Digital Library
X-ray spectroscopy of ion-surface interactions using superconducting tunnel junctions
We have conducted low energy X-ray spectroscopy of ion/surface interactions with superconducting tunnel junction (STJ) detectors. The STJ detectors (Nb-Al-AlOx-Al-Nb) developed at the Lawrence Livermore National Laboratory have a high energy resolution and a high count-rate capability. The detectors are operated in an adiabatic demagnetization refrigerator with 60 mK base temperature at the end of a 40 cm long cold finger, which can be inserted into a UHV sample chamber connected to an ion source. We have studied the interaction of Ar{sup 9+}, O{sup 7+}, N{sup 6+} and C{sup 5+} with various targets (Au, SiH and SiO{sub 2}) at a kinetic energy of 10 keV/q. The resolution of 12-15 eV below 1 keV allows the different satellite lines emitted by these ions to be separated.
Date:
July 21, 2001
Creator:
Niedermayr, Thomas; Friedrich, Stephan; Cunningham, Mark F.; Frank, Matthias; Briand, Jean-Pierre & Labov, Simon E.
Object Type:
Article
System:
The UNT Digital Library
An XML-based protocol for distributed event services
A recent trend in distributed computing is the construction of high-performance distributed systems called computational grids. One difficulty we have encountered is that there is no standard format for the representation of performance information and no standard protocol for transmitting this information. This limits the types of performance analysis that can be undertaken in complex distributed systems. To address this problem, we present an XML-based protocol for transmitting performance events in distributed systems and evaluate the performance of this protocol.
Date:
June 25, 2001
Creator:
Gunter, Dan K.; Smith, Warren & Quesnel, Darcy
Object Type:
Article
System:
The UNT Digital Library
XML-BASED REPRESENTATION
For focused applications with limited user and use application communities, XML can be the right choice for representation. It is easy to use, maintain, and extend and enjoys wide support in commercial and research sectors. When the knowledge and information to be represented is object-based and use of that knowledge and information is a high priority, then XML-based representation should be considered. This paper discusses some of the issues involved in using XML-based representation and presents an example application that successfully uses an XML-based representation.
Date:
February 2001
Creator:
Kelsey, R.
Object Type:
Article
System:
The UNT Digital Library
Y-12 Groundwater Protection Program Calendar Year 2000 Groundwater Monitoring Data Evaluation Report for the Bear Creek Hydrogeologic Regime at the U.S. Department of Energy Y-12 National Security Complex, Oak Ridge, Tennessee
This report presents an evaluation of the groundwater and surface water monitoring data obtained during calendar year (CY) 2000 in the Bear Creek Hydrogeologic Regime (Bear Creek Regime). The Bear Creek Regime encompasses many confirmed and potential sources of groundwater and surface water contamination associated with the U.S. Department of Energy (DOE) Y-12 National Security Complex (hereafter referenced as Y-12) in Oak Ridge, Tennessee (Figure A.1). Prepared by the Y-12 Groundwater Protection Program (GWPP), this report addresses applicable provisions of DOE Order 5400.1 (General Environmental Protection Program) that require: (1) an evaluation of the quantity and quality of groundwater and surface water in areas that are, or could be, affected by Y-12 operations, (2) an evaluation of groundwater and surface water quality in areas where contaminants from Y-12 operations are most likely to migrate beyond the DOE Oak Ridge Reservation (ORR) property line, and (3) an evaluation of long-term trends in groundwater quality at Y-12. The following sections of this report contain relevant background information (Section 2.0); describe the results of the respective data evaluations required under DOE Order 5400.1 (Section 3.0); summarize significant findings of each evaluation (Section 4.0); and list the technical reports and regulatory documents cited for …
Date:
September 1, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Y-12 Groundwater Protection Program Calendar Year 2000 Groundwater Monitoring Data Evaluation Report for the Chestnut Ridge Hydrogeologic Regime at the U.S. Department of Energy Y-12 National Security Complex, Oak Ridge, Tennessee
This report presents an evaluation of the groundwater and surface water monitoring data obtained during calendar year (CY) 2000 from sampling locations in the Chestnut Ridge Hydrogeologic Regime (Chestnut Ridge Regime). The Chestnut Ridge Regime encompasses several hazardous and nonhazardous waste management facilities associated with the U.S. Department of Energy (DOE) Y-12 National Security Complex (hereafter referenced as Y-12) southeast of Oak Ridge, Tennessee (Figure A.1). Prepared by the Y-12 Groundwater Protection Program (GWPP), this monitoring data evaluation report addresses applicable provisions of DOE Order 5400.1 -- General Environmental Protection Program -- that require: (1) an evaluation of the quantity and quality of groundwater in areas that are, or could be, impacted by Y-12 operations, (2) an evaluation of the quality of surface water and groundwater where contaminants from Y-12 facilities are most likely to migrate beyond the DOE Oak Ridge Reservation (ORR) property line, and (3) an evaluation of long-term trends in groundwater quality at Y-12. The following sections of this report contain relevant background information (Section 2.0); describe the results of the respective data evaluations required under DOE Order 5400.1 (Section 3.0); summarize significant findings of each evaluation (Section 4.0); and list the technical reports and regulatory documents …
Date:
September 1, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Y-12 Groundwater Protection Program Groundwater and Surface Water Sampling and Analysis Plan For Calendar Year 2002.
This plan provides a description of the groundwater and surface water quality monitoring activities planned for calendar year (CY) 2002 at the U.S. Department of Energy (DOE) Y-12 National Security Complex that will be managed by the Y-12 Groundwater Protection Program (GWPP). Groundwater and surface water monitoring performed by the GWPP during CY 2002 will be in accordance with the following requirements of DOE Order 5400.1: to evaluate and maintain surveillance of existing and potential groundwater contamination sources; to provide for the early detection of groundwater contamination and determine the quality of groundwater and surface water where contaminants are most likely to migrate beyond the Oak Ridge Reservation property line; to identify and characterize long-term trends in groundwater quality at Y-12; and to provide data to support decisions concerning the management and protection of groundwater resources. Groundwater and surface water monitoring during CY 2002 will be performed in three hydrogeologic regimes at Y-12: the Bear Creek Hydrogeologic Regime (Bear Creek Regime), the Upper East Fork Poplar Creek Hydrogeologic Regime (East Fork Regime), and the Chestnut Ridge Hydrogeologic Regime (Chestnut Ridge Regime). The Bear Creek and East Fork regimes are located in Bear Creek Valley, and the Chestnut Ridge Regime is …
Date:
September 1, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Yakima River Species Interactions Studies, Annual Report 1999.
Species interactions research and monitoring was initiated in 1989 to investigate ecological interactions among fish in response to proposed supplementation of salmon and steelhead in the upper Yakima River basin. This is the eighth of a series of progress reports that address species interactions research and pre-supplementation monitoring of fishes in the Yakima River basin. Data have been collected prior to supplementation to characterize the ecology and demographics of non-target taxa (NTT) and target taxon, and develop methods to monitor interactions and supplementation success. Major topics of this report are associated with implementing NTT monitoring prescriptions for detecting potential impacts of hatchery supplementation, hatchery fish interactions, and monitoring fish predation indices. This report is organized into four chapters, with a general introduction preceding the first chapter. This annual report summarizes data collected primarily by the Washington Department of Fish and Wildlife (WDFW) between January 1, 1998 and December 31, 1999 in the Yakima basin, however these data were compared to data from previous years to identify preliminary trends and patterns.
Date:
June 2001
Creator:
Pearsons, Todd N.
Object Type:
Report
System:
The UNT Digital Library
Yakima River Species Interactions Studies, Annual Report 2000.
Species interactions research and monitoring was initiated in 1989 to investigate ecological interactions among fish in response to proposed supplementation of salmon and steelhead in the upper Yakima River basin. This is the ninth of a series of progress reports that address species interactions research and supplementation monitoring of fishes in the Yakima River basin. Data have been collected prior to supplementation to characterize the ecology and demographics of non-target taxa (NTT) and target taxon, and develop methods to monitor interactions and supplementation success. Major topics of this report are associated with the chronology of ecological interactions that occur throughout a supplementation program, implementing NTT monitoring prescriptions for detecting potential impacts of hatchery supplementation, hatchery fish interactions, and monitoring fish predation indices. This report is organized into four chapters, with a general introduction preceding the first chapter. This annual report summarizes data collected primarily by the Washington Department of Fish and Wildlife (WDFW) between January 1, 2000 and December 31, 2000 in the Yakima basin, however these data were compared to data from previous years to identify preliminary trends and patterns. Summaries of each of the chapters included in this report are described.
Date:
December 2001
Creator:
Pearsons, Todd N.
Object Type:
Report
System:
The UNT Digital Library