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Synthesis, Characterization, and Reactivity of Prochiral Ruthenium Clusters and Bimetallic Rhenium Complexes with an Unsymmetrical Diphosphine and Hard-Soft Donor Ligands

Description: The reaction of [BrRe(CO)₄]₂ with 2-(diphenylphosphino)pyridine (PN) and 6-(diphenylphosphino)-2-formylpyridine (PON) was investigated. The reactions were regiospecific and exclusively produced the phosphorus-coordinated products, BrRe(CO)₄(κᵖ-PN) and BrRe(CO)₄(κᴾ-PON). The kinetics for the chelate ring closure (κᴾ→ κᴾᴺ) in BrRe(CO)₄(κᴾ-PN) were confirmed to occur by dissociative CO loss. The reaction of [BrRe(CO)₄]₂ with 2-(diphenylphosphino)pyridine (PN) was modeled computationally by DFT cal… more
Date: August 2019
Creator: Mayberry, Darrell D.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Gamma Prime Precipitation Mechanisms and Solute Partitioning in Ni-base Alloys

Description: Nickel-base superalloys have been emerged as materials for gas turbines used for jet propulsion and electricity generation. The strength of the superalloys depends mainly from an ordered precipitates of L12 structure, so called gamma prime (γ’) dispersed within the disorder γ matrix. The Ni-base alloys investigated in this dissertation comprise both model alloy systems based on Ni-Al-Cr and Ni-Al-Co as well as the commercial alloy Rene N5. Classical nucleation and growth mechanism dominates the… more
Date: August 2014
Creator: Rojhirunsakool, Tanaporn
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Solid Lubrication Mechanisms in Laser Deposited Nickel-titanium-carbon Metal Matrix Composites

Description: A Ni/TiC/C metal matrix composite (MMC) has been processed using the laser engineered net shaping (LENS) process from commercially available powders with a Ni-3Ti-20C (atomic %) composition. This processing route produces the in-situ formation of homogeneously distributed eutectic and primary titanium carbide and graphite precipitates throughout the Ni matrix. The composite exhibits promising tribological properties when tested in dry sliding conditions with a low steady state coefficient of fr… more
Date: December 2012
Creator: Mogonye, Jon-Erik
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Perceptions of Disaster Professionalism in Mexico: Adding a New Public Management Perspective to Emergency Management

Description: This study investigated the perceptions of emergency managers regarding the degree of emergency management professionalism in Mexico and how it can be improved. The disaster of the Mexico City earthquake of 1985 was used as the starting point for this case study, as the prospects for more-frequent and more-intense disasters lend credence to the need for improved professionalism and, thus, effectiveness among emergency managers in the future. An expansive framework of emergency management prof… more
Date: August 2010
Creator: Urby, Heriberto, Jr.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Thermodynamics, Kinetics, and Mechanism of (silox)3M(olefin) to (silox)3M(alkylidene) Rearrangements (silox = tBu3SiO; M = Nb, Ta)

Description: Article discussing the thermodynamic, kinetic, and mechanism of (silox)3M(olefin) to (silox)3M(alkylidene) rearrangements (silox = tBu3SiO; M = Nb, Ta).
Date: March 10, 2005
Creator: Hirsekorn, Kurt F.; Veige, Adam S.; Marshak, Michael P.; Koldobskaya, Yelena; Wolczanski, Peter T.; Cundari, Thomas R., 1964- et al.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
captions transcript

[News Clip: Stamps]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: May 29, 1978, 10:00 p.m.
Duration: 2 minutes
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: News brief - vault door]

Description: Video footage from the WBAP-TV station in Fort Worth, Texas to accompany a news story about the installation of a new bank vault door at the Republic Bank Building in Dallas.
Date: August 5, 1954
Duration: 46 seconds
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections

[Close up of a water wheel]

Description: Photograph of a close up shot of a water wheel with water pouring from the side of it. The camera is positioned near the left side of the wheel, viewing it at an angle. There are wooden stairs in the background and a man just off camera observing the wheel.
Date: [1939..1989]
Creator: Clark, Joe
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections

[Industrial wheel at a pause]

Description: Photograph of a machine with a large wheel at a pause. The wheel is in the center of the picture, with the rest of the machine sitting on its left. The machine sits inside a building with brick flooring and large open windows behind it, looking out to a grassy open area with trees and two parked automobiles.
Date: [1939..1989]
Creator: Clark, Joe
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections
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