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1,455 Matching Results
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The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 5, Ed. 1 Thursday, May 3, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 3, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 6, Ed. 1 Thursday, May 10, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 10, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 7, Ed. 1 Thursday, May 17, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 17, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 8, Ed. 1 Thursday, May 24, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 24, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 99, No. 9, Ed. 1 Thursday, May 31, 2001
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 31, 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
The Yellow Jacket (Brownwood, Tex.), Vol. 91, No. 23, Ed. 1, Thursday, May 3, 2001
Weekly student newspaper from Howard Payne University in Brownwood, Texas that includes local, state and campus news along with advertising.
Date:
May 3, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Yellowstone as an Analog for Thermal-Hydrological-Chemical Processes at Yucca Mountain
Enhanced water-rock interaction resulting from the emplacement of heat-generating nuclear waste in the potential geologic repository at Yucca Mountain, Nevada, may result in changes to fluid flow (resulting from mineral dissolution and precipitation in condensation and boiling zones, respectively). Studies of water-rock interaction in active and fossil geothermal systems (natural analogs) provide evidence for changes in permeability and porosity resulting from thermal-hydrological-chemical (THC) processes. The objective of this research is to document the effects of coupled THC processes at Yellowstone and then examine how differences in scale could influence the impact that these processes may have on the Yucca Mountain system. Subsurface samples from Yellowstone National Park, one of the largest active geothermal systems in the world, contain some the best examples of hydrothermal self-sealing found in geothermal systems. We selected core samples from two USGS research drill holes from the transition zone between conductive and convective portions of the geothermal system (where sealing was reported to occur). We analyzed the core, measuring the permeability, porosity, and grain density of selected samples to evaluate how lithology, texture, and degree of hydrothermal alteration influence matrix and fracture permeability.
Date:
May 29, 2001
Creator:
Dobson, P. F.; Kneafsey, T. J.; Simmons, A. & Hulen, J.
Object Type:
Report
System:
The UNT Digital Library
"Yes" was the password for DART in Y2K
News release celebrating DART's successes over the previous year following the release of the agency's annual report for 2000. These successes included the approval of a bond package to fund its accelerated extensions of rail lines and its highest annual ridership yet.
Date:
May 17, 2001
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
YIELD STRESS ANOMALIES, DISLOCATION CORE STRUCTURES AND SUBSTITUTIONAL ALLOYING IN MOLYBDENUM DISILICIDE
A brief overview of the temperature dependence of yield strength for the different slip systems of MoSi{sub 2} is presented and mechanisms for the yield stress anomaly are discussed. Recent results on the atomistic simulation of the dislocation core structures and mobility are presented next. Finally, we present experimental results on substitutional alloying of polycrystalline MoSi{sub 2} with 1-2 at.% Re, Nb and Al. Re resulted in an order of magnitude increase in compressive strength at 1600 C, Al caused solution softening at near-ambient temperatures, and Nb caused softening at low temperatures and hardening at high temperatures. The quaternary MoSi{sub 2}-Re-Al alloys showed strengthening at elevated temperatures and reduction in flow stress with enhanced plasticity at near-ambient temperatures. The mechanisms of solution hardening and softening are discussed using insight from transmission electron microscopy observations of the dislocation substructures and atomistic simulation results.
Date:
May 1, 2001
Creator:
MISRA, A.; MITCHELL, T.; BASKES, M. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Yoakum Herald-Times (Yoakum, Tex.), Vol. 109, No. 18, Ed. 1 Wednesday, May 2, 2001
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
May 2, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 109, No. 19, Ed. 1 Wednesday, May 9, 2001
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
May 9, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 109, No. 20, Ed. 1 Wednesday, May 16, 2001
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
May 16, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 109, No. 21, Ed. 1 Wednesday, May 23, 2001
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
May 23, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 109, No. 22, Ed. 1 Wednesday, May 30, 2001
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
May 30, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History