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Uncovering the single top: observation of electroweak top quark production

Description: The top quark is generally produced in quark and anti-quark pairs. However, the Standard Model also predicts the production of only one top quark which is mediated by the electroweak interaction, known as 'Single Top'. Single Top quark production is important because it provides a unique and direct way to measure the CKM matrix element V{sub tb}, and can be used to explore physics possibilities beyond the Standard Model predictions. This dissertation presents the results of the observation of S… more
Date: August 1, 2009
Creator: Benitez, Jorge Armando
Partner: UNT Libraries Government Documents Department
open access

Search for charged Higgs bosons in decays of top quarks in proton - antiproton collisions at s**(1/2) = 1.96 TeV

Description: In this dissertation we report on the first direct search for charged Higgs bosons in decays of top quarks in p{bar p} collisions at {radical}s = 1.96 TeV. The search uses a data sample with an integrated luminosity of 2.2 fb{sup -1} collected by the CDF II detector at Fermilab and looks for a resonance in the invariant mass distribution of two jets in the lepton+jets sample of t{bar t} candidates. We observe no evidence of charged Higgs bosons in top quark decays; hence 95% C.L. upper limits o… more
Date: August 1, 2009
Creator: Yu, Geum Bong
Partner: UNT Libraries Government Documents Department
open access

From ZZ to ZH : How Low Can These Cross Sections Go or Everybody, Let's Cross Section Limbo!

Description: We report on two searches performed at the D0 detector at the Fermi National Laboratory. The first is a search for Z di-boson production with a theoretical cross section of 1.4 pb. The search was performed on 2.6 fb{sup -1} of data and contributed to the first observation of ZZ production at a hadron collider. The second is a search for a low mass Standard Model Higgs in 4.2 fb{sup -1} of data. The Higgs boson is produced in association with a Z boson where the Higgs decays hadronically and the… more
Date: August 1, 2009
Creator: Strauss, Emanuel Alexandre
Partner: UNT Libraries Government Documents Department
open access

Direct analysis of samples by mass spectrometry: From elements to bio-molecules using laser ablation inductively couple plasma mass spectrometry and laser desorption/ionization mass spectrometry

Description: Mass spectrometric methods that are able to analyze solid samples or biological materials with little or no sample preparation are invaluable to science as well as society. Fundamental research that has discovered experimental and instrumental parameters that inhibit fractionation effects that occur during the quantification of elemental species in solid samples by laser ablation inductively coupled plasma mass spectrometry is described. Research that determines the effectiveness of novel laser… more
Date: August 19, 2009
Creator: Perdian, David C.
Partner: UNT Libraries Government Documents Department
open access

Observation of excited state charge transfer with fs/ps-CARS

Description: Excited state charge transfer processes are studied using the fs/ps-CARS probe technique. This probe allows for multiplexed detection of Raman active vibrational modes. Systems studied include Michler's Ketone, Coumarin 120, 4-dimethylamino-4{prime}-nitrostilbene, and several others. The vibrational spectrum of the para di-substituted benzophenone Michler's Ketone in the first excited singlet state is studied for the first time. It is found that there are several vibrational modes indicative of… more
Date: August 1, 2009
Creator: Blom, Alex Jason
Partner: UNT Libraries Government Documents Department
open access

Ion distributions at charged aqueous surfaces: Synchrotron X-ray scattering studies

Description: Surface sensitive synchrotron X-ray scattering studies were performed to obtain the distribution of monovalent ions next to a highly charged interface at room temperature. To control surface charge density, lipids, dihexadecyl hydrogen-phosphate (DHDP) and dimysteroyl phosphatidic acid (DMPA), were spread as monolayer materials at the air/water interface, containing CsI at various concentrations. Five decades in bulk concentrations (CsI) are investigated, demonstrating that the interfacial dist… more
Date: August 15, 2009
Creator: Bu, Wei
Partner: UNT Libraries Government Documents Department
open access

Muon neutrino disappearance at MINOS

Description: A strong case has been made by several experiments that neutrinos oscillate, although important questions remain as to the mechanisms and precise values of the parameters. In the standard picture, two parameters describe the nature of how the neutrinos oscillate: the mass-squared difference between states and the mixing angle. The purpose of this thesis is to use data from the MINOS experiment to precisely measure the parameters associated with oscillations first observed in studies of atmosphe… more
Date: August 1, 2009
Creator: Armstrong, R.
Partner: UNT Libraries Government Documents Department
open access

Viscosity of aqueous and cyanate ester suspensions containing alumina nanoparticles

Description: The viscosities of both aqueous and cyanate ester monomer (BECy) based suspensions of alumina nanoparticle were studied. The applications for these suspensions are different: aqueous suspensions of alumina nanoparticles are used in the production of technical ceramics made by slip casting or tape casting, and the BECy based suspensions are being developed for use in an injection-type composite repair resin. In the case of aqueous suspensions, it is advantageous to achieve a high solids content … more
Date: August 5, 2009
Creator: Lawler, Katherine
Partner: UNT Libraries Government Documents Department
open access

Rational Ligand Design for U(VI) and Pu(IV)

Description: Nuclear power is an attractive alternative to hydrocarbon-based energy production at a time when moving away from carbon-producing processes is widely accepted as a significant developmental need. Hence, the radioactive actinide power sources for this industry are necessarily becoming more widespread, which is accompanied by the increased risk of exposure to both biological and environmental systems. This, in turn, requires the development of technology designed to remove such radioactive threa… more
Date: August 12, 2009
Creator: Szigethy, Geza
Partner: UNT Libraries Government Documents Department
open access

COUPLED MULTI-GROUP NEUTRON PHOTON TRANSPORT FOR THE SIMULATION OF HIGH-RESOLUTION GAMMA-RAY SPECTROSCOPY APPLICATIONS

Description: The accurate and efficient simulation of coupled neutron-photon problems is necessary for several important radiation detection applications. Examples include the detection of nuclear threats concealed in cargo containers and prompt gamma neutron activation analysis for nondestructive determination of elemental composition of unknown samples.
Date: August 1, 2009
Creator: Burns, Kimberly A.
Partner: UNT Libraries Government Documents Department
open access

God's Perfect Timing

Description: When I was thirty-three years old, I discovered I was an adoptee. In this memoir of secrecy and love, betrayal and redemption, I reflect on my early experiences as a doted-on only child firmly rooted in the abundant love of my adoptive family, my later struggles with depression and obsessive-compulsive disorder, my marriage to a fellow-adoptee, my discovery of my own adoption and the subsequent reunion with my birth family, my navigation through the thrills and tensions of newly complicated fam… more
Date: August 2009
Creator: Rizzo, Steven
Partner: UNT Libraries
open access

An Informational Theory of Midterm Elections: The Impact of Iraq War Deaths on the 2006 Election.

Description: There has been much scholarly attention directed at the Iraq war's role in determining voter choice. I attempt to extend that research into voter turnout to determine what role the Iraq war played in 2006 voter turnout. This paper argues that turnout at the state level could be explained by the number of US deaths each state had sustained from the Iraq occupation at the time of the election. A theory of voter activation based on information availability is put forth to explain the relationsh… more
Date: August 2009
Creator: Kahanek, Jared E.
Partner: UNT Libraries
open access

Evaluation of skill maintenance, performance factors, and external validity in a behavioral parent training program.

Description: Child maltreatment affects 900 thousand children in the U.S. every year and impacts all areas of daily functioning. Behavioral parent training (BPT) programs have effectively taught parenting and demonstrated externally valid outcomes (i.e., lower recidivism rates). Skill maintenance assessments for BPTs have mixed results. The Behavior Management and Parenting Services (BMAPS) program has shown effective skill training for court-mandated families. This study assessed skill maintenance and perf… more
Date: August 2009
Creator: Scherbarth, Andrew J.
Partner: UNT Libraries
open access

An Introduction to the AIDS Quilt Songbook and Its Uncollected Works

Description: The AIDS Quilt Songbook was a musical response to the shame surrounding the outbreak of the HIV virus and was one of the first art song publications to deal with the topic of HIV and AIDS. This DMA thesis documents the significance and history of the AIDS Quilt Songbook, traces the progression of the project up until December 1, 2008, and documents the work, experiences, and words of the composers who have been inspired to contribute to the AIDS Quilt Songbook Project. In 1981, the medical and … more
Date: August 2009
Creator: Seesholtz, John Clayton
Partner: UNT Libraries
open access

Social Movements, Subjectivity, and Solidarity: Witnessing Rhetoric of the International Solidarity Movement

Description: This study engaged in pushing the current political limitations created by the political impasse of the Palestinian-Israeli conflict, by imagining new possibilities for radical political change, agency, and subjectivity for both the international activists volunteering with the International Solidarity Movement as well as Palestinians enduring the brutality of life under occupation. The role of the witness and testimony is brought to bear on activism and rhetoric the social movement ISM in Pale… more
Date: August 2009
Creator: Wachsmann, Emily Brook
Partner: UNT Libraries
open access

Growth and Characterization of β-Iron Disilicide, β-Iron Silicon Germanide, and Osmium Silicides

Description: The semiconducting silicides offer significant potential for use in optoelectronic devices. Full implementation of the materials, however, requires the ability to tailor the energy gap and band structure to permit the synthesis of heterojunctions. One promising approach is to alloy the silicides with Ge. As part of an investigation into the synthesis of semiconducting silicide heterostructures, a series of β-Fe(Si1−xGex)2 epilayer samples, with nominal alloy content in the range 0 < x < 0.15, h… more
Date: August 2009
Creator: Cottier, Ryan James
Partner: UNT Libraries
open access

Francis Poulenc's Sonata for Horn, Trumpet and Trombone: A Structural Analysis Identifying Historical Significance, Form and Implications for Performance

Description: Research has been conducted on Francis Poulenc and his prominent 20th century sonata for brass instruments. Poulenc and members of the French compositional collaboration known as Les Six have all been subjects of research. Francis Poulenc's Sonata for Horn Trumpet and Trombone is a crucial piece in the development of brass chamber music during the 20th century. As one of the first works written for modern brass instruments, it demonstrates a highly crafted compositional style representative of … more
Date: August 2009
Creator: Cord, John T.
Partner: UNT Libraries
open access

The Impact of IT Capability on Employee Capability, Customer Value, Customer Satisfaction, and Business Performance

Description: This study empirically examines the impact of IT capability on firms' performance and evaluates whether firms' IT capabilities play a role in improving employee capability, customer value, customer satisfaction, and ultimately business performance. The results were based on comparing the business performance of the IT leader companies with that of control companies of similar size and industry. The IT leader companies were selected from the Information Week 500 list published annually from 2001… more
Date: August 2009
Creator: Chae, Ho-Chang
Partner: UNT Libraries
open access

Significant Influences in the Composition of Hendrik Hofmeyr's Song Cycle, Alleenstryd

Description: The poet of this cycle, Sydney Vernon Petersen, was a man who faced great adversity during Apartheid. The title of this cycle, Alleenstryd, is an Afrikaans term for 'a struggle alone.' Petersen was of mixed heritage or "Coloured" and born in South Africa in 1914. He died in 1987. His most important works in Afrikaans poetry were published between 1948 and 1965. This cycle specifically focuses on the relationship between the poet and his community, the isolation he endured within that community,… more
Date: August 2009
Creator: Cupido, Conroy Alan
Partner: UNT Libraries
open access

The Parent Participation Discourse of a Community School: Diverse Ideas and Perceptions about Educational Partnership at an Inner City Community School

Description: Despite the widespread recommendation that schools "collaborate" with parents, little is found in the literature to elaborate on what this term or the common synonym "partnership" means, and further, how schools can invite diverse parental contributions to the table of educational discourse. The current study looks to contribute to the literature by analyzing the parent participation discourse in one community elementary school, utilizing critical discourse analysis and ethnographic observation… more
Date: August 2009
Creator: Coe, Alice Elizabeth
Partner: UNT Libraries
open access

Processing, structure property relationships in polymer layer double hydroxide multifunctional nanocomposites

Description: Dan Beaty (1937-2002) was a prolific composer, pianist, researcher, educator, and writer. His large compositional output included chamber works, choral works, songs, orchestral pieces, electronic music, and keyboard works. Beaty was well versed in traditional Western music as well as the more avant-garde and perplexing idioms of the twentieth century. Beaty's compositions reflect the many fascinating, if not always popular, musical trends of his time. His music encompasses styles from serial … more
Date: August 2009
Creator: Ogbomo, Sunny Minister
Partner: UNT Libraries
open access

Interaction of learning approach with concept integration and achievement in a large guided inquiry organic class.

Description: A study was conducted to investigate the relationship of students' concept integration and achievement with time spent within a topic and across related topics in a large first semester guided inquiry organic chemistry class. Achievement was based on evidence of algorithmic problem solving; and concept integration was based on demonstrated performance explaining, applying, and relating concepts to each other. Twelve individual assessments were made of both variables over three related topics - … more
Date: August 2009
Creator: Mewhinney, Christina
Partner: UNT Libraries
open access

Transnational Compositionality and Hemon, Shteyngart, Díaz; A No Man's Land, Etc.

Description: Contemporary transnational literature presents a unique interpretive problem, due to new methods of language and culture negotiation in the information age. The resulting condition, transnational compositionality, is evidenced by specific linguistic artifacts; to illustrate this I use three American novels as a case study: Nowhere Man by Aleksandar Hemon, Absurdistan by Gary Shteyngart, and The Brief Wondrous Life of Oscar Wao by Junot Díaz. By extension, many conventional literary elements are… more
Date: August 2009
Creator: Miner, Joshua D.
Partner: UNT Libraries
open access

Study of the effects of background and motion camera on the efficacy of Kalman and particle filter algorithms.

Description: This study compares independent use of two known algorithms (Kalmar filter with background subtraction and Particle Filter) that are commonly deployed in object tracking applications. Object tracking in general is very challenging; it presents numerous problems that need to be addressed by the application in order to facilitate its successful deployment. Such problems range from abrupt object motion, during tracking, to a change in appearance of the scene and the object, as well as object to sc… more
Date: August 2009
Creator: Morita, Yasuhiro
Partner: UNT Libraries
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