You limited your search to:

 Collection: UNT Theses and Dissertations
Kinetic Studies of the Reactions of Alkyl and Silyl Hydrides

Kinetic Studies of the Reactions of Alkyl and Silyl Hydrides

Date: August 1996
Creator: Yuan, Jessie (Jessie Win-Jae)
Description: The Kinetics of the reactions involving alkyl and silyl hydrides were studied by the flash photolysis / resonance fluorescence technique. The reactions of alkyl radicals (R = C₂H₅, i-C₃H₇, t-C₄H₉) with HBr have been studied at room temperature and the rate constants obtained (units are in cm³ s^-1 ) are: k₃.₃ = (7.01 ± 0.15) x 10^-12, k₃.₂ = (1.25 ± 0.06) x 10^-11, k₃.₁ = (2.67 ± 0.13) x 10^-11 These results, combined with previously determined reverse rate constants and other kinetic information, yield bond dissociation enthalpies (units in kJ mol^-1) at 298 K : primary C-H in C₂H₅-H (423.6 ± 2), secondary C-H in i-C₃H₇-H (409.9 ± 2), tertiary C-H in t-C₄H₉-H (405.1 ± 2). These rate constants and bond energies are in good agreement with previous results.
Contributing Partner: UNT Libraries
Kinetics and Mechanism Study of Diphenylketene Cycloadditions

Kinetics and Mechanism Study of Diphenylketene Cycloadditions

Date: August 1967
Creator: O'Neal, Hubert Ronald
Description: From a review of the published work in the field of cycloadditions, it is evident that further research is needed to establish the mechanism of ketene cycloadditions. This work was initiated with the intent of obtaining kinetic data which will contribute to the elucidation of the mechanism of ketene cycloadditions.
Contributing Partner: UNT Libraries
Kinetics and Mechanisms of Metal Carbonyls

Kinetics and Mechanisms of Metal Carbonyls

Date: May 1998
Creator: Ladogana, Santino
Description: Pulsed laser flash photolysis with both visible and infrared detection has been applied to the study of the displacement of weakly coordinating ligands (Lw) by strongly "trapping" nucleophiles (Ls) containing either an olefinic functionality (Ls = 1-hexene, 1-decene, 1-tetradecene) or nitrogen (Ls = acetonitrile, hydrocinnamonitrile) from the photogenerated 16 electron pentacarbonylchromium (0) intermediate. 5-Chloropent-l-ene (Cl-ol), a potentially bidentate ligand, has been shown to form (ol-Cl) pentacarbonylchromium (0), in which Cl-ol is bonded to Cr via a lone pair on the chlorine, and isomerize to (Cl-ol) pentacarbonylchromium (0), in which Cl-ol is bonded to the olefinic functionality on the submillisecond time scale. This process has been studied in both the infrared and visible region employing both fluorobenzene or n-heptane as the "inert" diluent. Parallel studies employing 1-chlorobutane and 1-hexene were also evaluated and showed great similiarity with the Cl-ol system. The data supported a largely dissociative process with a possibility of a small interchange process involving the H's on the alkyl chain. Studies were also carried out for various Cr(CO)6/arene/Ls systems (arene = various alkyl or halogenated substituted benzenes). The data indicated that for both C6H5R (R=various alkyl chains) or multi-alkyl substituted arenes (i.e. o-xylene, 1,2,3-trimethylbenzene) containing an "unhindered" ring-edge, bonding ...
Contributing Partner: UNT Libraries
Kinetics and Thermochemistry of Halogenated Species

Kinetics and Thermochemistry of Halogenated Species

Date: May 1997
Creator: Misra, Ashutosh
Description: Gas phase kinetics and thermochemistry of several halogenated species relevant to atmospheric, combustion and plasma chemistry were studied using experimental and ab initio theoretical techniques.
Contributing Partner: UNT Libraries
Kinetics of Reactions of Substituted Group VI B Metal Carbonyls with Phosphites

Kinetics of Reactions of Substituted Group VI B Metal Carbonyls with Phosphites

Date: August 1972
Creator: Rettenmaier, Albert J.
Description: The problem with which this investigation is concerned is twofold. The initial part of the problem was to prepare a non-sterically demanding bidentate phosphine ligand, 1,2-bis-(Phosphino)ethane, (P-en), and to determine the kinetics of (P-en)Mo(CO)4 with phosphites via spectrophotometric methods in an attempt to determine if steric effects are directing the type of mechanism followed.
Contributing Partner: UNT Libraries
Kinetics of Sulfur: Experimental Study of the Reaction of Atomic Sulfur with Acetylene and Theoretical Study of the Cn + So Potential Energy Surface

Kinetics of Sulfur: Experimental Study of the Reaction of Atomic Sulfur with Acetylene and Theoretical Study of the Cn + So Potential Energy Surface

Date: May 2013
Creator: Ayling, Sean A.
Description: The kinetics of the reaction of atomic sulfur with acetylene (S (3P) + C2H2) were investigated experimentally via the flash photolysis resonance fluorescence method, and the theoretical potential energy surface for the reaction CN + SO was modeled via the density functional and configuration interaction computational methods. Sulfur is of interest in modern chemistry due to its relevance in combustion and atmospheric chemistry, in the Claus process, in soot and diamond-film formation and in astrochemistry. Experimental conditions ranged from 295 – 1015 K and 10 – 400 Torr of argon. Pressure-dependence was shown at all experimental temperatures. The room temperature high-pressure limit second order rate constant was (2.10 ± 0.08) × 10-13 cm3 molecule-1 s-1. The Arrhenius plot of the high-pressure limit rate constants gave an Ea of (11.34 ± 0.03) kJ mol-1 and a pre-exponential factor of (2.14 ± 0.19) × 10-11 cm3 molecule-1 s-1. S (3P) + C2H2 is likely an adduct forming reaction due to pressure-dependence (also supported by a statistical mechanics analysis) which involves intersystem crossing. The potential energy surface for CN + SO was calculated at the B3LYP/6-311G(d) level and refined at the QCISD/6-311G(d) level. The PES was compared to that of the analogous reaction ...
Contributing Partner: UNT Libraries
Kinzua Dam: a Study in the Congressional Disruption, Relocation-Resettlement, and Rehabilitation of the Seneca Nation of Indians

Kinzua Dam: a Study in the Congressional Disruption, Relocation-Resettlement, and Rehabilitation of the Seneca Nation of Indians

Date: January 1969
Creator: Verelst, Robert
Description: This thesis embraces four major topics coinciding with the four considerations designated in President John F. Kennedy's letter to President Basil Williams of the Seneca Nation and the reactions to those items generated during numerous hearings of the House Subcommittee on Indian Affairs. The four topics covered in the President's letter include the possibility of acquiring adjacent property, commonly referred to as "in lieu of" lands, to replace the Indian real estate taken for the Allegheny Reservoir; a review of the reservoir's recreational potential for the benefit of the Seneca Nation; special damages accruing to the Senecas for the loss of their land; and relocation and resettlement.
Contributing Partner: UNT Libraries
Kleinian Groups in Hilbert Spaces

Kleinian Groups in Hilbert Spaces

Date: August 2012
Creator: Das, Tushar
Description: The theory of discrete groups acting on finite dimensional Euclidean open balls by hyperbolic isometries was borne around the end of 19th century within the works of Fuchs, Klein and Poincaré. We develop the theory of discrete groups acting by hyperbolic isometries on the open unit ball of an infinite dimensional separable Hilbert space. We present our investigations on the geometry of limit sets at the sphere at infinity with an attempt to highlight the differences between the finite and infinite dimensional theories. We discuss the existence of fixed points of isometries and the classification of isometries. Various notions of discreteness that were equivalent in finite dimensions, no longer turn out to be in our setting. In this regard, the robust notion of strong discreteness is introduced and we study limit sets for properly discontinuous actions. We go on to prove a generalization of the Bishop-Jones formula for strongly discrete groups, equating the Hausdorff dimension of the radial limit set with the Poincaré exponent of the group. We end with a short discussion on conformal measures and their relation with Hausdorff and packing measures on the limit set.
Contributing Partner: UNT Libraries
The Klezmer Influence in Paul Schoenfield’s Klezmer Rondos

The Klezmer Influence in Paul Schoenfield’s Klezmer Rondos

Access: Use of this item is restricted to the UNT Community.
Date: December 2011
Creator: Trimble, Mark
Description: Paul Schoenfield’s Klezmer Rondos is a work for flute, male vocalist, and orchestra revised in 1994 according to the score given to me by the composer. A review of current research in klezmer heritage music is the starting point to place Klezmer Rondos in the context of art music infused with klezmer flavor. Klezmer music can be defined as the instrumental folk music of Eastern European Jews, however because of its adaptability and quality of assimilating other cultures within it, this heritage music is constantly in flux. By looking at the research in this field, I describe how the sound of klezmer music has evolved and how popular notions have been formed. The body of this research explores the main musical aspects of Klezmer Rondos that can be tied to the klezmer tradition: scales and thematic materials, improvisatory elements, ornamentation, and instrumentation. Klezmer Rondos moves beyond a simple arrangement of vernacular music for orchestra; it is a fusion of contemporary art music with the elements of klezmer style.
Contributing Partner: UNT Libraries
Knowing is Seaing: Conceptual Metaphor in the Fiction of Kate Chopin

Knowing is Seaing: Conceptual Metaphor in the Fiction of Kate Chopin

Date: May 1997
Creator: Green, Suzanne Disheroon, 1963-
Description: This paper examines the metaphoric structures that underlie Chopin's major novel, The Awakening, as well as those underlying selected short stories. Drawing on the modern theory of metaphor described by Mark Turner, George Lakoff, and Mark Johnson, the author argues that conceptual metaphors are the structural elements that underlie our experiences, thoughts, and words, and that their presence is revealed through our everyday language. Since these conceptual structures are representative of human thought and language, they are also present in literary texts, and specifically in Chopin's texts. Conceptual metaphors and the linguistic forms that result from them are so basic a part of our thinking that we automatically construct our utterances by means of them. Accordingly, conceptual metaphor mirrors human thought processes, as demonstrated by the way we describe our experiences.
Contributing Partner: UNT Libraries