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Voi M'Incendete: Don Carlo Gesualdo
Undergraduate thesis that is a collection of poems inspired by the life of Don Carlo Gesualdo.
Date:
2012~
Creator:
Coronado, Sam
System:
The UNT Digital Library
A Proof-of-Principle Echo-enabled Harmonic Generation Free Electron Laser Experiment at SLAC
With the advent of X-ray Free Electron Lasers (FELs), new methods have been developed to extend capabilities at short wavelengths beyond Self-Amplified Spontaneous Emission (SASE). In particular, seeding of a FEL allows for temporal control of the radiation pulse and increases the peak brightness by orders of magnitude. Most recently, Gennady Stupakov and colleagues at SLAC proposed a new technique: Echo-Enabled Harmonic Generation (EEHG). Here a laser microbunches the beam in an undulator and the beam is sheared in a chicane. This process is repeated with a second laser, undulator and chicane. The interplay between these allows a seeding of the X-ray laser up to the 100th harmonic of the first laser. After introducing the physics of FELs and the EEHG seeding technique, we describe contributions to the experimental effort. We will present detailed studies of the experiment including the choice of parameters and their optimization, the emittance effect, spontaneous emission in the undulators, the second laser phase effect, and measurements of the jitter between RF stations. Finally, the status and preliminary results of the Echo-7 experiment will be outlined.
Date:
January 6, 2012
Creator:
Pernet, Pierre-Louis
System:
The UNT Digital Library
A Cell-Centered Multiphase ALE Scheme With Structural Coupling
None
Date:
January 17, 2012
Creator:
Dunn, T. A.
System:
The UNT Digital Library
Wide Bandgap Extrinsic Photoconductive Switches
Photoconductive semiconductor switches (PCSS) have been investigated since the late 1970s. Some devices have been developed that withstand tens of kilovolts and others that switch hundreds of amperes. However, no single device has been developed that can reliably withstand both high voltage and switch high current. Yet, photoconductive switches still hold the promise of reliable high voltage and high current operation with subnanosecond risetimes. Particularly since good quality, bulk, single crystal, wide bandgap semiconductor materials have recently become available. In this chapter we will review the basic operation of PCSS devices, status of PCSS devices and properties of the wide bandgap semiconductors 4H-SiC, 6H-SiC and 2H-GaN.
Date:
January 17, 2012
Creator:
Sullivan, J S
System:
The UNT Digital Library
Study of CP Violation in Dalitz-Plot Analyses of B-Meson Decays to Three Kaons
The Standard Model (SM) explains CP violation in terms of the CKM matrix. The BABAR experiment was designed mainly to test the CKM model in B decays. B decays that proceed through b {yields} s loop diagrams, of which B {yields} KKK decays are an example, are sensitive to new physics effects that could lead to deviations from the CKM predictions for CP violation. We present studies of CP violation in the decays B{sup +} {yields} K{sup +}K{sup -}K{sup +}, B{sup +} {yields} K{sub S}{sup 0}K{sub S}{sup 0}K{sup +}, and B{sup 0} {yields} K{sup +}K{sup -}K{sub S}{sup 0}, using a Dalitz plot amplitude analysis. These studies are based on approximately 470 million B{bar B} decays collected by BABAR at the PEP-II collider at SLAC. We perform measurements of time-dependent CP violation in B{sup 0} {yields} K{sup +}K{sup -}K{sub S}{sup 0}, including B{sup 0} {yields} {phi}K{sub S}{sup 0}. We measure a CP-violating phase {beta}{sub eff} ({phi}K{sub S}{sup 0}) = 0.36 {+-} 0.11 {+-} 0.04 rad., in agreement with the SM. This is the world's most precise measurement of this quantity. We also measure direct CP asymmetries in all three decay modes, including the direct CP asymmetry A{sub CP} ({phi}K{sup +}) = …
Date:
February 15, 2012
Creator:
Lindquist, Brian
System:
The UNT Digital Library
Study of charmonium resonances in the gg -> K0SK pi- and gg -> K K-pi pi-pi0 processes
This thesis reports the analysis of the e{sup +}e{sup -} {yields} e{sup +}e{sup -}K{sub S}{sup 0}K{sup {+-}}{pi}{sup {-+}} and e{sup +}e{sup -} {yields} e{sup +}e{sup -}K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} processes using the final dataset of the BABAR experiment located at the SLAC National Accelerator Laboratory. From previous measurements, the K{sub S}{sup 0}K{sup {+-}}{pi}{sup {-+}} final state is known to show a clear signal from the {eta}{sub c}(2S) particle. This c{bar c} state escaped detection for almost twenty years and its properties are still not well established on the experimental ground, while accurate predictions exist on the theoretical side. The e{sup +}e{sup -} {yields} e{sup +}e{sup -}K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} process is first studied in this thesis. An accurate determination of the {eta}{sub c}(2S) properties is obtained in the K{sub S}{sup 0}K{sup {+-}}{pi}{sup {-+}} decay mode. We also report the first observation of {eta}{sub c}(2S) and other charmonium states to the K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} final state. The results of this thesis have been published in Physical Review D, and will be useful to test theoretical models describing the charmonium system. The thesis is organized in four chapters. The first one gives a brief introduction …
Date:
February 22, 2012
Creator:
Biassoni, Pietro & /U. Milan, Dept. Phys.
System:
The UNT Digital Library
Rhodium mediated bond activation: from synthesis to catalysis
Recently, our lab has developed monoanionic tridentate ligand, To{sup R}, showing the corresponding coordination chemistry and catalyst reactivity of magnesium, zirconium, zinc and iridium complexes. This thesis details synthetic chemistry, structural study and catalytic reactivity of the To{sup R}-supported rhodium compounds. Tl[To{sup R}] has been proved to be a superior ligand transfer agent for synthesizing rhodium complexes. The salt metathesis route of Tl[To{sup M}] with [Rh({mu}-Cl)(CO)]{sub 2} and [Rh({mu}- Cl)(COE)]{sub 2} gives To{sup M}Rh(CO){sub 2} (2.2) and To{sup M}RhH({eta}{sup 3}-C{sub 8}H{sub 13}) (3.1) respectively while Tl[To{sup P}] with [Rh({mu}-Cl)(CO)]{sub 2} affords To{sup P}Rh(CO){sub 2} (2.3). 2.2 reacts with both strong and weak electrophiles, resulting in the oxazoline N-attacked and the metal center-attacked compounds correspondingly. Using one of the metal center-attacked electrophiles, 2.3 was demonstrated to give high diastereoselectivity. Parallel to COE allylic C-H activation complex 3.1, the propene and allylbenzene allylic C-H activation products have also been synthesized. The subsequent functionalization attempts have been examined by treating with Brønsted acids, Lewis acids, electrophiles, nucleophiles, 1,3-dipolar reagents and reagents containing multiple bonds able to be inserted. Various related complexes have been obtained under these conditions, in which one of the azide insertion compounds reductively eliminates to give an allylic functionalization product …
Date:
March 6, 2012
Creator:
Ho, Hung-An
System:
The UNT Digital Library
Measurement of the D_s Decay Constant f_Ds and Observation of New Charm Resonances Decaying to D^(*)\pi
The absolute branching fractions for the decays D{sub s}{sup -} {yields} {ell}{sup -}{bar {nu}}{sub {ell}} ({ell} = e, {mu}, or {tau}) are measured using a data sample corresponding to an integrated luminosity of 521 fb{sup -1} collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEPII e{sup +}e{sup -} collider at SLAC. The number of D{sub s}{sup -} mesons is determined by reconstructing the recoiling system DKX{gamma} in events of the type e{sup +}e{sup -} {yields} DKXD*{sub s}{sup -}, where D*{sub s}{sup -} {yields} D{sub s}{sup -} {gamma} and X represents additional pions from fragmentation. The D{sub s}{sup -} {yields} {ell}{sup -}{nu}{sub {ell}} events are detected by full or partial reconstruction of the recoiling system DKX{gamma}{ell}. The following results are obtained: {Beta}(D{sub s}{sup -} {yields} {mu}{sup -}{nu}) = (6.02 {+-} 0.38 {+-} 0.34) x 10{sup -3}, {Beta}(D{sub s}{sup -} {yields} {tau}{sup -}{nu}) = (5.00 {+-} 0.35 {+-} 0.49) x 10{sup -2}, and B(D{sub s}{sup -} {yields} e{sup -}{nu}) < 2.8 x 10{sup -4} at 90% C.L., where the first uncertainty is statistical and the second is systematic. The branching fraction measurements are combined to determine the D{sub s}{sup -} decay constant f{sub D{sub s}} …
Date:
March 15, 2012
Creator:
Benitez, Jose
System:
The UNT Digital Library
Energy Spread Reduction of Electron Beams Produced via Laser Wake
Laser wakefield acceleration of electrons holds great promise for producing ultra-compact stages of GeV scale, high quality electron beams for applications such as x-ray free electron lasers and high energy colliders. Ultra-high intensity laser pulses can be self-guided by relativistic plasma waves over tens of vacuum diffraction lengths, to give >1 GeV energy in cm-scale low density plasma using ionization-induced injection to inject charge into the wake at low densities. This thesis describes a series of experiments which investigates the physics of LWFA in the self-guided blowout regime. Beginning with high density gas jet experiments the scaling of the LWFA-produced electron beam energy with plasma electron density is found to be in excellent agreement with both phenomenological theory and with 3-D PIC simulations. It is also determined that self-trapping of background electrons into the wake exhibits a threshold as a function of the electron density, and at the densities required to produce electron beams with energies exceeding 1 GeV a different mechanism is required to trap charge into low density wakes. By introducing small concentrations of high-Z gas to the nominal He background the ionization-induced injection mechanism is enabled. Electron trapping is observed at densities as low as 1.3 x …
Date:
March 19, 2012
Creator:
Pollock, B.
System:
The UNT Digital Library
At Quem Non Ceno, Barbarus Ille Mihi Est: Roman and Jewish Dietary Traditions in Antiquity
Thesis written by a student in the UNT Honors College discussing how ancient Roman and Jewish dietary traditions confirmed group identity, expressed piety through ritual, and were otherwise a matter of social significance.
Date:
Spring 2012
Creator:
Self, Amanda Grace
System:
The UNT Digital Library
Attitudes and Internalized Stigma in Gay and Lesbian College Students
Thesis written by a student in the UNT Honors College discussing the influence and predictive qualities of homonegative attitudes on internalized homophobia among gay, lesbian, and bisexual college students, and the moderating effects of self esteem on these variables.
Date:
Spring 2012
Creator:
White, Mickey
System:
The UNT Digital Library
Between Identity and Commodity: Female Urban Experience in Vicki Baum's Menschen im Hotel
Thesis written by a student in the UNT Honors College discussing the urban experiences of German women in the late Weimar Republic as portrayed in the character Flammchen in Vicki Baum's 1929 Novel Menschen im Hotel.
Date:
Spring 2012
Creator:
Jones, Carina
System:
The UNT Digital Library
Deterrence: American Naval Policy In The Western Pacific, Realistic Or Subject To Change
Thesis written by a student in the UNT Honors College discussing the future of United States naval deterrence and its viability.
Date:
Spring 2012
Creator:
Wicks, Harrison
System:
The UNT Digital Library
Drug Related Corruption
Thesis written by a student in the UNT Honors College discussing the relationship between the global drug trade and the corruption of government officials. Included is a history of international drug prohibition, cases of corruption by country, United States policies implemented to prevent corruption, and an analysis of the potential for success in curtailing drug related corruption in the U. S.
Date:
Spring 2012
Creator:
Adams, Mark
System:
The UNT Digital Library
An Entangled Pathology
Thesis written by a student in the UNT Honors College discussing the history of healthcare in the Gaza Strip from 1940 to 2008, the role of healthcare in the development of Hamas, the current state of health systems in the Gaza Strip, and how the relationship between Hamas with the citizens of Gaza, Israel, and other countries have an effect on the healthcare of Gaza.
Date:
Spring 2012
Creator:
Vargas, Annalisa L.
System:
The UNT Digital Library
First observation of the Charmless Decay B to K pi0pi0 and Study of its Dalitz Plot Structure
Results for the first measurement of the inclusive branching and CP asymmetry of the charmless 3-body decay B{sup +} {yields} K{sup +}{pi}{sup 0}{pi}{sup 0} are presented. The analysis uses a data sample with an integrated luminosity of 429.0 fb{sup -1}, recorded by the BABAR detector at the PEP-II asymmetric B Factory. This sample corresponds to 470.9 {+-} 2.8 million B{bar B} pairs. Measurements of the branching fractions (B) and CP asymmetries (A{sub CP}) of some of the intermediate resonances in the K{sup +}{pi}{sup 0}{pi}{sup 0} Dalitz plot are also presented.
Date:
March 21, 2012
Creator:
Puccio, Eugenia Maria Teresa Irene & /SLAC, /Warwick U.
System:
The UNT Digital Library
Impressions Capital Jurors Form of Attorneys During Voir Dire
Thesis written by a student in the UNT Honors College discussing the nature of capital trials in the United States, specifically the death qualification process during jury selection which is thought to prejudice juries towards guilty verdicts.
Date:
Spring 2012
Creator:
Azzami, Najua
System:
The UNT Digital Library
Learned Helplessness and Metabolic Control in Type 1 Diabetes
Thesis written by a student in the UNT Honors College discussing how difficulties in managing type 1 diabetes can have psychological impacts upon people with the disease, such as eroding the feeling of having control over their bodies.
Date:
Spring 2012
Creator:
Trube, Richelle
System:
The UNT Digital Library
Mapping Molly Affect: Subjectivities of Society and Same-Sex Individuals through Eighteenth-Century British Print Culture
Thesis written by a student in the UNT Honors College discussing eighteenth century homosexual culture in London, England, as related through emotional geography and print media.
Date:
Spring 2012
Creator:
Camp, Briana
System:
The UNT Digital Library
Precursor to Genocide: A Study of Physicians in Nazi Germany
Thesis written by a student in the UNT Honors College discussing German eugenics under the rule of the Nazi party.
Date:
Spring 2012
Creator:
Huffman, Hillarie
System:
The UNT Digital Library
Shutters Shut and Open
Thesis written by a student in the UNT Honors College discussing Gertrude Stein's use of written portraiture, her relationship with avant-garde photographers, and art theory.
Date:
Spring 2012
Creator:
Parkinson, Laure
System:
The UNT Digital Library
"That One Congenial Friend:" Hawthorne's Search for a Careful Reader
Thesis written by a student in the UNT Honors College discussing author Nathaniel Hawthorne's hidden warnings of hypocrisies and civil violations that would occur despite constitutional protections. The author argues that Hawthorne hid his warnings in allegory.
Date:
Spring 2012
Creator:
Garrido, Alejandro
System:
The UNT Digital Library
Investigation of high-precision {Lambda} hypernuclear spectroscopy via the (e,e'K{sup +}) reaction
The study of {Lambda} hypernuclear structure is very interesting in point of the understanding of the interaction between {Lambda} and nucleon ({Lambda}-N interaction) and its strange structure itself due to the containment of a {Lambda} hyperon which has a strangeness as a new degree of freedom. In the several way to study the Lamda hypernuclei, the (e,e'K{sup +}) reaction spectroscopy is a powerful tool for the precise investigation of {Lamda} hypernuclear structure. The purpose of the preset thesis is the establishment of the experimental design with the efficient data analysis method for the (e,e'K{sup +}) hypernuclear spectroscopic experiment in the wide mass region (from A=7 to A=52). It is very challenging to perform the (e,e'K{sup +}) spectroscopic experiment with such a heavy target, because of the huge electron background due to the bremsstrahlung process. In the experiment, it is required to obtain the necessary hypernuclear yield, suppressing the background event ratio. We achieved these requirements by newly constructing the high resolution electron spectrometer (HES) and splitter magnet (SPL) dedicated to the (e,e'K{sup +}) spectroscopic experiment. The HES consists of two quadrupole magnets and a dipole magnets (Q-Q-D) with a momentum resolution of dp/p = 3x10^-4 at p = 0.84 GeV/c. …
Date:
March 31, 2012
Creator:
Kawama, Daisuke
System:
The UNT Digital Library
United abominations: Density functional studies of heavy metal chemistry
Carbonyl and nitrile addition to uranyl (UO{sup 2}{sup 2+}) are studied. The competition between nitrile and water ligands in the formation of uranyl complexes is investigated. The possibility of hypercoordinated uranyl with acetone ligands is examined. Uranyl is studied with diactone alcohol ligands as a means to explain the apparent hypercoordinated uranyl. A discussion of the formation of mesityl oxide ligands is also included. A joint theory/experimental study of reactions of zwitterionic boratoiridium(I) complexes with oxazoline-based scorpionate ligands is reported. A computational study was done of the catalytic hydroamination/cyclization of aminoalkenes with zirconium-based catalysts. Techniques are surveyed for programming for graphical processing units (GPUs) using Fortran.
Date:
April 2, 2012
Creator:
Schoendorff, George
System:
The UNT Digital Library