Now showing items 3481-3540 of 13351

    • Kinetics of core material dissolution in the presence of inhibitors for application in geologic carbon sequestration 

      Work, Sarah Nicole (2010)
      With increased attention on rising carbon dioxide levels, carbon capture and sequestration (CCS) has become a commonly proposed solution. CCS has been studied for several decades, but is being researched more and more seriously as to whether it may be a viable and economically feasible long-term solution to climate change. Research conducted for this ...
    • Tests of inter-hotspot motion and of hotspot motion relative to the spin axis 

      Koivisto, Emilia Anna-Liisa (2010)
      First, an updated Pacific paleomagnetic skewness pole for chron 32 (72 Ma) is presented. The updated paleomagnetic pole corrects for the spreading-rate dependence of anomalous skewness, a correction which hasn't been applied to Pacific skewness poles before. The presence of anomalous skewness is one of the main factors limiting the accuracy of ...
    • A grassroots war on poverty: Community action and urban politics in Houston, 1964-1976 

      Phelps, Wesley G. (2010)
      Grassroots studies of the implementation of the federal antipoverty initiatives of the 1960s and 1970s are showing that the War on Poverty did not operate in a vacuum; rather, it was profoundly shaped by a multifarious group of local actors that included public officials, local elites, grassroots antipoverty activists, program administrators, federal ...
    • Reversers and restorers of religion: Mourning and meaning in contemporary psychological portraits of religious leaders 

      Carlin, Nathan (2010)
      After reading in psychology of religion and pastoral theology for several years, I began to notice that a certain strand, which might be described as iconoclastic or subversive with regard to traditional religion, runs through both fields, and characteristic of this strand often includes what I call a dynamic of reversals and restorations. That is, ...
    • Inference of parsimonious species phylogenies from multi-locus data 

      Than, Cuong V. (2010)
      The main focus of this dissertation is the inference of species phylogenies, i.e. evolutionary histories of species. Species phylogenies allow us to gain insights into the mechanisms of evolution and to hypothesize past evolutionary events. They also find applications in medicine, for example, the understanding of antibiotic resistance in bacteria. ...
    • Dynamic response of multi-degree of freedom structure with sliding isolation system and uplift 

      Vemuru, Venkata Srivishnu Mohan (2010)
      In this study the two dimensional dynamic response of a Multi Degree of Freedom (MDOF) sliding isolated structure permitted to uplift is studied. The MDOF superstructure is supported by two sets of sliding bearings situated at both the ends of the base mat. The foundation supporting the sliding bearings is assumed to be flexible and modeled using two ...
    • Grid-centric scheduling strategies for workflow applications 

      Zhang, Yang (2010)
      Grid computing faces a great challenge because the resources are not localized, but distributed, heterogeneous and dynamic. Thus, it is essential to provide a set of programming tools that execute an application on the Grid resources with as little input from the user as possible. The thesis of this work is that Grid-centric scheduling techniques of ...
    • A hybrid relaying protocol for the parallel-relay network 

      Summerson, Samantha Rose (2010)
      Cooperation among radios in wireless networks has been shown to improve communication in several aspects. We analyze a wireless network which employs multiple parallel relay transceivers to assist in communication between a single source-destination pair, demonstrating that gains are achieved when a random subset of relays is selected. We derive ...
    • Processing, spinning, and fabrication of continuous fibers of single-walled carbon nanotubes 

      Booker, Richard DeLane (2010)
      Single-walled carbon nanotubes (SWNTs) show great promise for use in a wide range of applications. One of the most promising avenues for attaining these applications is the dispersion of SWNTs at high concentrations in superacids and processing into macroscopic articles such as fibers or films. Fibers spun from SWNT/superacid dispersions indicate ...
    • Piano performance and technique: A study of the modern grand piano 

      Mimaki, Kana (2010)
      The study of how the modern grand piano functions from a construction standpoint has been overlooked by modern pianists. This dissertation explores how an understanding of the inner workings of the piano will lead to more healthy, efficient, and purposeful approach to the performance of the piano. It examines how the piano is constructed, how the ...
    • Absorption and scattering of single plasmonic nanoparticles 

      Ha, Ji Won (2010)
      In this thesis, I present the absorption and scattering properties of single gold nanoparticles. I performed scanning electron microscopy (SEM) correlated dark-field scattering studies of gold nanorods (AuNRs). I found polarization-dependent scattering of a single AuNR. I studied the dependence of surface plasmon resonance (SPR) linewidth on both the ...
    • Preconditioned iterative methods for inhomogeneous acoustic scattering applications 

      Sifuentes, Josef (2010)
      This thesis develops and analyzes efficient iterative methods for solving discretizations of the Lippmann--Schwinger integral equation for inhomogeneous acoustic scattering. Analysis and numerical illustrations of the spectral properties of the scattering problem demonstrate that a significant portion of the spectrum is approximated well on coarse ...
    • Estimating the term structure with a semi-parametric Bayesian population model: An application to corporate bonds 

      Cruz Marcelo, Alejandro (2010)
      The term structure of interest rates is used to price defaultable bonds and credit derivatives, as well as to infer the quality of bonds for risk management purposes. We introduce a new framework for estimating the term structure of interest rates for corporate bonds. The proposed model jointly estimates term structures by means of a Bayesian ...
    • Discontinuous Galerkin time domain methods for acoustics and comparison with finite difference time domain methods 

      Wang, Xin (2010)
      This thesis describes an implementation of the discontinuous Galerkin finite element time domain (DGTD) method on unstructured meshes to solve acoustic wave equations in heterogeneous media. In oil industry people use finite difference time domain (FDTD) methods to simulate seismic surveys, the first step to explore oil and gas in the earth's subsurface, ...
    • Arms racing and conflict in the Third World: 1970-2000 

      Marin, Victor Claudio (2010)
      In this dissertation I investigate the relationship between arms races and the probability of militarized conflict onset. The research question is critically important on at least two fronts: first, many policy makers and scholars alike believe ramping up military forces is the best way to deter military conflict (the peace through strength argument) ...
    • Inner magnetospheric modeling during geomagnetic active times 

      Yang, Jian (2010)
      In this thesis we show that the entropy parameter PV5/3 , where P is the pressure and V is the volume of a flux tube with unit magnetic flux, plays a central role in the earthward plasma convection from the near- and middle-Earth plasma sheet to the inner magnetosphere. This work presents a series of numerical simulations, investigating the relationship ...
    • Investigating mechanical and physical properties of nanostructures 

      Bankehsaz, Morteza (2010)
      In the first part of the dissertation, mechanical properties of bundles of carbon nanotubes are investigated. Earlier experiments showed that these tubes are tightly packed in the bundles, proving that they are strongly interacting. Furthermore, extensive applications of bundles of CNTs in microelectronics such as electrical interconnect have been ...
    • Market power and efficiency 

      Kutlu, Levent (2010)
      In the first chapter, we examine the relation between efficiency and competition in a dynamic framework. For this purpose, we measure efficiencies and conduct of the U.S. airlines in two city-pairs. We model the conduct parameter as an unobservable state variable which is an AR(1) process and estimate it by the square-root Kalman filter technique. ...
    • Illuminating biomolecular interactions with localized surface plasmon resonance 

      Mayer, Kathryn M. (2010)
      Noble metal nanoparticles exhibit localized surface plasmon resonance (LSPR), in which incident light causes a collective oscillation of a nanoparticle's free electrons. This phenomenon results in unique optical properties, including enhanced electric fields near the particle surface and an extinction peak at the resonant wavelength. The LSPR extinction ...
    • Heaven or Las Vegas: An excursion after hyperreality 

      Govela Martinez, Alberto (2010)
      Heaven or Las Vegas Seeks to question, reconsider and project the existing conditions, contemporary techniques and future constructions of the hyperreal. The hyperreal site, initially a destination apart from the everyday life, has undergone a crucial transformation during the last 20 years. As a product of the experience economy, the techniques of ...
    • Carbon nanotubes thermal conductivity analysis using molecular dynamics simulations 

      Toprak, Kasim (2010)
      Non-equilibrium molecular dynamics simulations are used to determine the thermal conductivities of (5,5) single wall carbon nanotubes. By fixing the temperatures of opposing ends of an armchair single wall carbon nanotube with a Nose-Hoover thermostat, the length dependence of thermal conductivities of single wall carbon nanotubes were studied in ...
    • Solubility, length characterization, and cryo-TEM of pristine and functionalized single-walled carbon nanotubes in surfactant and superacid systems, with application to spinning SWNT fibers 

      Parra-Vasquez, A. Nicholas G. (2010)
      Single wall carbon nanotubes (SWNTs) have remarkable properties: the thermal conductivity of diamond, the electrical conductivity of copper, and mechanical properties greater than steel at a sixth of the weight. If these properties can be retained at the macroscale, SWNT fibers could be used in many high performance applications. The difficulty lies ...
    • Insights into peroxisome matrix protein import and IBA metabolism through analysis of IBA-response mutants 

      Martinez, Naxhiely (2010)
      Peroxisomes are single membrane-bound organelles that function to compartmentalize certain metabolic reactions critical to plant and animal development. I have studied peroxisomal processes in the model plant Arabidopsis thaliana , with a focus on the import of matrix proteins from the cytoplasm into the organelle matrix and the metabolism of the ...
    • Semi-analytical model for carbon nanotube and graphene nanoribbon transistors 

      Yang, Xuebei (2010)
      Carbon nanotubes and graphene provide high carrier mobility for ballistic transport, high carrier velocity for fast switching, and excellent mechanical and thermal conductivity. As a result, they are widely considered as next generation candidate materials for nanoelectronics. In this thesis, I first propose a physics-based semi-analytical model for ...
    • Sonority as a semiotic matrix of signification in French symbolist poetry 

      Sagot, Jacques (2010)
      This document investigates a subject apparently rather traditional, perhaps even traditionalist: the exploration of the phonological, syntactical and semantical resources by means of which French symbolist poetry acts upon the reader. This project is not, however, as strange to the current theoretical conceptions as one might believe. Derrida, Foucault, ...
    • Magneto-optical spectroscopy of novel ferromagnetic materials 

      Sun, Chanjuan (2010)
      Two types of novel ferromagnetic materials, (Ga,Mn)As and Fei/4TaS2, were studied in this dissertation. Interest in (Ga,Mn)As is stimulated by the emerging field of spintronics, which has a potential of bringing a technology revolution in information processing, information storage, and quantum computing. The latter, Feu1/4TaS2, belongs to the family ...
    • Effects of fuel alcohols on BTEX plume dynamics: An assessment of natural attenuation using RT3D with a general substrate interaction module 

      Gomez, Diego E. (2010)
      A numerical model was developed to evaluate the effect of fuel alcohols present in reformulated gasoline on BTEX natural attenuation and groundwater plume elongation. The model, developed as a module for the RT3D (Reactive Transport in 3-Dimensions) model, includes commonly considered fate and transport processes (advection, dispersion, adsorption, ...
    • Overpressure and Earthquake Initiated Slope Failure in the Ursa Region, Northern Gulf of Mexico 

      Stigall, Justin Lee (2010)
      We use two-dimensional fluid flow and slope stability models to study the evolution of overpressure and slope stability in the Ursa region, northern Gulf of Mexico. Our model predictions match measured overpressures from Integrated Ocean Drilling Project Expedition 308 Site U1324 above 200 mbsf, but overpredicts deeper overpressures by 0.4-1.1 MPa. ...
    • Escort protein regulation of the human mitochondrial molecular chaperone mtHsp70 

      Zhai, Peng (2010)
      Mitochondrial Hsp70 molecular chaperones (mtHsp70) are nuclear-encoded proteins that are needed for the import of proteins into the mitochondrial matrix, biogenesis of Fe/S-clusters involved in energy metabolism, and stress response folding. Unlike the Hsp70 homologs found in other subcellular compartments, two of the mtHsp70 homologs in yeast require ...
    • In-vivo studies of fullerene-bis(bisphosphonate) and synthesis of a fullerene-bisphosphonate-beta-blocker conjugate for the prevention and treatment of osteoporosis 

      Peralta, Ivana Romina Guadalupe (2010)
      Fullerene (C60) derivatives have been extensively studied for a variety of medical applications, which include neuroprotective agents, HIV-1 protease inhibitors, photodynamic cancer therapeutics, medical contrast agents and radiotracers, slow release systems for aerosol liposome delivery, immunotherapy agents, and transfection vectors. The first part ...
    • Aural fictions: Sound in African American literature 

      Messmer, David (2010)
      This dissertation explores the importance of representations of sound in the African American literary tradition. Beginning with Frederick Douglass's descriptions of the slave songs and working through depictions of jazz in the early moments of the Civil Rights movement, I show that the aural dimension of African American culture has mediated black ...
    • Entry guidance for human lunar return vehicles with low lift-to-drag ratios 

      Mees, Eric (2010)
      During the entry phase of a human lunar mission, an entry guidance algorithm is used to safely steer the return vehicle through the atmosphere to a target landing site. The PredGuid entry guidance algorithm is enhanced to improve performance and satisfy a set of assumed mission requirements. The enhanced algorithm utilizes an improved numeric ...
    • Offshore Concourse: New ground for a landless urbanism 

      Epley, Meredith Elizabeth (2010)
      'Offshore Concourse' is an urban proposal for a response to changing ecological, economic and political conditions in Alaska and the Arctic. Since 2007, the Northwest Passage has been navigable without need of an icebreaker. As climate change rapidly redraws the world's coastlines, it poses both opportunities and challenges for global trade: melting ...
    • A storage architecture for data-intensive computing 

      Shafer, Jeffrey (2010)
      The assimilation of computing into our daily lives is enabling the generation of data at unprecedented rates. In 2008, IDC estimated that the "digital universe" contained 486 exabytes of data [9]. The computing industry is being challenged to develop methods for the cost-effective processing of data at these large scales. The MapReduce programming ...
    • [D]urbanism: The revelation of repressed transgression 

      Hickey, Donald (2010)
      Detroit lays stunned as the product of abusive parenting. The loyal workhorse of the American Dream wallows in the dedicated obsolescence of an economic monoculture and fiends for the opiate of capitalism. Yet despite the neglect, a new vitality is brewing amongst the shadows of post-fordist residue. Within the labeled obsolescence breeds a new ...
    • Magneto-optical spectroscopy of metallic carbon nanotubes 

      Searles, Thomas A., Jr. (2010)
      Through polarization-dependent magneto-optical absorption spectroscopy, the magnetic susceptibility anisotropy for metallic single-walled carbon nanotubes has been extracted and found to be up to 4x greater than values for semiconducting single-walled carbon nanotubes. Consistent with theoretical predictions, this is the first experimental evidence ...
    • Compact support wavelet representations for solution of quantum and electromagnetic equations: Eigenvalues and dynamics 

      Acevedo, Ramiro, Jr (2010)
      Wavelet-based algorithms are developed for solution of quantum and electromagnetic differential equations. Wavelets offer orthonormal localized bases with built-in multiscale properties for the representation of functions, differential operators, and multiplicative operators. The work described here is part of a series of tools for use in the ultimate ...
    • Time-varying stability analysis of linear systems with linear matrix inequalities 

      Wilder, John (2010)
      Aerospace attitude control systems are often modeled as time-varying linear systems. In industry, these systems are analyzed with linear time-invariant (LTI) methods by treating the system as slowly varying. Stability analysis with parameter dependent Lyapunov functions and linear matrix inequalities (LMIs) enables the consideration of bounds on ...
    • Functionalization of carbon nanomaterials for biomedical and nanocomposite applications 

      Kuznetsov, Oleksandr (2010)
      New derivatives of carbon nanostructures: nanotubes, nano-onions and nanocrystalline diamonds were obtained through fluorination and subsequent functionalization with sucrose. Chemically modified nanocarbons show high solubility in water, ethanol, DMF and can be used as biomaterials for medical applications. It was demonstrated that sucrose functionalized ...
    • The distractor frequency effect in Stroop and picture-word interference paradigms 

      Geng, Jingyi (2010)
      The color naming (Stroop) and picture-word interference (PWI) paradigms play a pivotal role in theorizing about cognitive processes in general, and language production in particular. Despite their assumed similarities, there exist discrepancies. In this study, I compared the effect of distractor word frequency between Stroop and PWI paradigms (in PWI ...
    • Grouping and search efficiency in emergent features and topological properties in human vision 

      Portillo, Mary C. (2010)
      A series of three experiments were designed to test for Emergent Features, which, in Gestalt psychology, are indicative of grouping. By using basic elements such as dots or lines and building EFs sequentially, while maintaining the original discrimination constant, it was possible to compare the strength of different EFs. Proximity, Orientation, ...
    • Performance limits of brain machine interfaces 

      Goodman, Ilan N. (2010)
      Understanding the constraints governing information transfer between electrodes and neurons is crucial to the effective design of neural prostheses. In sensory prostheses such as cochlear implants, information is transferred to the brain by stimulating neurons to produce sensation. In motor prostheses such as cortically controlled bionic limbs, neural ...
    • On the separation of T Tauri star spectra using non-negative matrix factorization and Bayesian positive source separation 

      Kenney, Colleen (2010)
      The objective of this study is to compare and evaluate Bayesian and deterministic methods of positive source separation of young star spectra. In the Bayesian approach, the proposed Bayesian Positive Source Separation (BPSS) method uses Gamma priors to enforce non-negativity in the source signals and mixing coefficients and a Markov Chain Monte Carlo ...
    • Exchange in the barranco: Organizing the internal economy 

      Herrera Duran, Yvette (2010)
      This thesis problematizes the infrastructural and social boundaries of informal settlements established in anomalous depressed tissues within the gridded city. It does so by proposing a new urban strategy that intends to dissolve the edge condition as well as reconnect extracted points of the settlement as a means to pulsate the activity of the slum ...
    • Fatal attractions: The pleasures of spectacular terror 

      Husain, Asma (2010)
      Each spectacularly publicized terrorist event strengthens our fascination with death and destruction. Barricaded behind architectures of control, our anxieties and fears escalate. Rather than diminishing our dread, we watch with morbid pleasure as distant events unfold right before us. The terrorist eagerly performs for an attentive audience. For the ...
    • Lung carcinogenesis modeling: Resampling and simulation approach to model fitting, validation, and prediction 

      Foy, Millennia (2010)
      Because of serious health implications, lung cancer is the leading cancer killer for both men and women. It is well known that smoking is the major risk factor for lung cancer. I propose to use a two-stage clonal expansion (TSCE) model to evaluate the effects of smoking on initiation and promotion of lung carcinogenesis. The TSCE model is traditionally ...
    • Carbon nanotube based hybrid nanostructures: Synthesis and applications 

      Ou, Fung Suong (2010)
      Hybrid nanostructures are fascinating materials for their promising applications in future nanoelectronics, electrical interconnects and energy storage devices. Practical ways of connecting individual carbon nanotubes to metal contacts for their use as interconnects and in electronic devices have been challenging. In this thesis, carbon nanotube based ...
    • Ab initio methods for protein structure prediction 

      Dousis, Athanasios Dimitri (2010)
      Recent breakthroughs in DNA and protein sequencing have unlocked many secrets of molecular biology. A complete understanding of gene function, however, requires a protein structure in addition to its sequence. Modern protein structure determination methods such as NMR, cryo-EM and X-ray crystallography are woefully unable to keep pace with automated ...
    • Deformations and motions in compressible non-linear elasticity 

      Erdemir Ungor, Esen (2010)
      The primary purpose of this study is to identify solutions for deformations and motions in compressible non-linear elasticity. The research study mainly focuses on the mathematical theory of deformations and motions of non-linearly elastic compressible hollow spheres and hollow cylinders reinforced with inextensible fibers in the radial direction. Static ...
    • Static analysis for circuit families 

      Salama, Cherif R. (2010)
      As predicted by Gordon Moore, the number of transistors on a chip has roughly doubled every two years. Microprocessors featuring over a billion transistors are no longer science fiction. For example, Intel's Itanium 9000 series and Intel's Xeon 7400 series of processors feature 1.7 and 1.9 billion transistors respectively. To keep up with the emerging ...
    • Urban Frame; after endless [inner] deja vu 

      Gillespie, Benson Bright (2010)
      The continuous interior of endless Junkspace, is, at its best, the compulsive repetition of itself. This architectural condition, which exists worldwide, is characteristic of airports, casinos, malls, urban tunnel/skyway systems and transit linked nodal developments. Constantly expanding due to the elevator, escalator and A.C. Unit, this endless ...
    • Regulated release of a novel non-viral gene delivery vector from electrospun coaxial fiber mesh scaffolds 

      Saraf, Anita (2010)
      The development of novel strategies for tissue engineering entails the evolution of biopolymers into multifunctional constructs that can support the proliferation of cells and stimulate their differentiation into functional tissues. With that in mind, biocompatible polymers were fabricated into a novel gene delivery agent as well as three dimensional ...
    • Operation of the run IIB DO luminosity system and determination of the run IIB luminosity constant 

      Prewitt, Michelle V. (2010)
      The luminosity system is an integral part of the DO detector that must be properly maintained to provide accurate luminosity measurements for physics analysis. After the addition of a readout layer to the silicon vertex detector in 2006, it was necessary to re-calculate the effective inelastic cross section to which the luminosity monitor is sensitive. ...
    • Computational discovery and analysis of metabolic pathways 

      Heath, Allison Park (2010)
      Finding novel or non-standard metabolic pathways, possibly spanning multiple species, has important applications in fields such as metabolic engineering, metabolic network analysis, and metabolic network reconstruction. Traditionally, this has been a manual process, but the large volume of metabolic data now available has created a need for computational ...
    • The role of age in causal attributions for poor performance: Target and rater effects 

      Cox, Cody Brent (2010)
      Previous research has demonstrated that raters evaluate the performance of older and younger targets differently as a function of the raters' ages (e.g., Shore, Cleveland, & Goldberg, 2003). This discrepancy may result from a belief that older workers' performance is affected by age-related declines in abilities (Posthuma & Campion, 2009). In these ...
    • Millimeter wave transmission spectroscopy of two-dimensional electron and hole systems 

      Stone, Kristjan Jakob (2010)
      In order to explore how electrons and holes in 2D semiconductors behave at 3He temperatures under millimeter wave irradiation, we developed a new probe and measurement technique. Our samples are specially grown high-mobility GaAs/AlGaAs 2D electron or hole systems that have been modulation doped with Si or C respectively and etched into Hall bars. ...
    • Discrete simulations of density-driven volcanic deformation: Applications to Martian caldera complexes 

      Zivney, Lindsay Laurel (2010)
      We have carried out 2-D numerical simulations using the discrete element method (DEM) to investigate density-driven deformation in Martian volcanic edifices and how it affects the development of caldera complexes. These simulations demonstrate that the presence of a dense and weak cumulate body within a volcanic edifice strongly influences the volcano ...
    • Quantitative measurements of individual gold nanoparticle scattering cross sections 

      Anderson, Lindsey J. E. (2010)
      The local surface plasmon resonance (LSPR) of noble metal nanoparticles has recently been exploited in numerous applications. The LSPR peak position and linewidth have been studied quite extensively, but the magnitude of the resonance has not received much attention. Analytical solutions to Maxwell's Equations cannot predict the scattering cross ...
    • Resistive switching in silicon oxide-based systems 

      Yao, Jun (2010)
      Voltage-controlled resistive switching in various gap systems on SiO2 substrates is demonstrated. The nanosized gaps are made by several means using different materials including metals, semiconductors and amorphous carbon. The switching site is further reduced in size by using multi-walled carbon nanotubes and single-walled carbon nanotubes. The ...
    • Diphthongization in Brazilian Portuguese 

      Colley, Michael (2010)
      The goal of this dissertation is to increase our understanding of language variation and change by examining a particular case of linguistic variation in Rio de Janeiro. Diphthongization of back vowels before word final /s/ in words like mas "but" is a commonly noted feature of the Portuguese spoken in Rio de Janeiro. This leads to a potential merger ...