377 Works

Periodically Disturbed Oscillators

Brian Daffern Hong
By controlling the timing of events and enabling the transmission of data over long distances, oscillators can be considered to generate the "heartbeat" of modern electronic systems. Their utility, however, is boosted significantly by their peculiar ability to synchronize to external signals that are themselves periodic in time. Although this fascinating phenomenon has been studied by scientists since the 1600s, models for describing this behavior have seen a disconnect between the rigorous, methodical approaches taken...

Methods for the Production of Lithium Carbonate from Lipidolite

Basil Hopper
[Introduction] The object of this investigation has been to determine a method to extract lithium from its ores in order to produce Li2CO3 which is used in medicine. Lithium salts command very good prices (averaging about $1.50 per pound) and a simple method of production would form a successful commercial enterprise. Lithium occurs in lepidolite (a lithium mica) and in amblygonite and other moderately rare minerals. In Southern California there are deposits of lepidolite with...

Laboratory Studies of Granular Materials Under Shear: From Avalanches to Force Chains

Eloïse Sophie Hélène Marteau
Granular materials reveal their complexity and some of their unique features when subjected to shear deformation. They can dilate, behave like a solid or a fluid, and are known to carry external forces preferentially as force chains. In this dissertation, we employ laboratory experiments to study the complex behavior of granular materials under shear. We introduce a multiscale approach in which the underlying grain-scale mechanics are experimentally measured and homogenized to obtain enriched macroscopic quantities....

Therapeutic Opportunities and Approaches to Sequence Control for Nucleic Acids

Matthew Leroy, III Gethers
RNA interference (RNAi) is a powerful mechanism to regulate gene expression. A key feature of RNAi is its sequence specificity: a short interfering RNA (siRNA) assembles into the RNA induced silencing complex (RISC) and then targets cellular transcripts complementary to the siRNA for degradation. RNAi has been adapted for therapeutic applications, but is challenged by the need to identify unique target transcripts for each disease that are both effective and result in few off-target effects....

Redox Signaling in Eukaryotic DNA Replication and Repair

Elizabeth O'Brien
DNA-mediated charge transport chemistry (DNA CT) offers an intriguing regulatory mechanism in biology, as it is long-range, rapid, and sensitive to mismatches and perturbations to base stacking. DNA-processing enzymes in all three domains of life moreover have been shown to contain [4Fe4S] clusters, commonly redox cofactors. Bacterial [4Fe4S] repair proteins have been shown to signal one another using long-range DNA-mediated charge transport (DNA CT), facilitating the redistribution to damaged genomic DNA in cells. The role...

Equations of State, Sound Velocities, and Thermoelasticity of Iron-Nickel-Silicon Alloys in the Earth’s Inner Core

Rachel A. Morrison
The core of the Earth is predominately iron alloyed with approximately 5 wt% nickel along with some amount of light elements, e.g., Si, O, S, C, H, Mg. Mineral physics studies, in conjunction with seismological and cosmochemical observations, provide an opportunity to improve constraints on the composition of the core. In this thesis, we investigate the thermoelastic and vibrational properties of bcc- and hcp-structured Fe0.91Ni0.09 and Fe0.8Ni0.1Si0.1 (atomic percent) at high pressures. We present powder...

The Distribution of Picric Acid Between Water and Benzene and the Effect on the Equilibrium of Added Sodium and Hydrogen Chlorides

James Ewing Hill
This investigation was undertaken in order to study the distribution of picric acid between the immiscible solvents water and benzene at different concentrations, and to determine the effect upon this equilibrium of the addition of successive amounts to sodium chloride and hydrogen chloride to the aqueous phase. Data of this character is very similar to that relating to the effect of added electrolytes upon the solubility of slightly soluble salts and the theoretical conclusions which...

TCCON data from Zugspitze (DE), Release GGG2014.R0

R. Sussmann & M. Rettinger

These data are now obsolete and should be replaced by the most recent data: https://doi.org/10.14291/tccon.ggg2014.zugspitze01.R1

The Total Carbon Column Observing Network (TCCON) is a network of ground-based Fourier Transform Spectrometers that record direct solar absorption spectra of the atmosphere in the near-infrared. From these spectra, accurate and precise column-averaged abundances of atmospheric constituents including CO2, CH4, N2O, HF, CO, H2O, and HDO, are retrieved. This data set contains observations from the TCCON station at...

A Comparison of the Costs of Operation of the Motor Bus, Birney Safety Car, and Trolley Bus on the Local Transportation Routes in Pasadena

Douglas Albert Stromsoe
With the installation by the Pacific Electric Railway of a bus system in Pasadena to supplant most of its trolley lines, the problem of the comparison of the costs of the two systems naturally presented itself. The study here undertaken was originally started as just a comparison of the motor bus and Birney Safety Car, but as the work progressed it seemed advisable to include the trolley bus as well - a method of transportation...

The ABCs of the Color Code: A Study of Topological Quantum Codes as Toy Models for Fault-Tolerant Quantum Computation and Quantum Phases Of Matter

Aleksander Marek Kubica
This thesis is devoted to studying a class of quantum error-correcting codes — topological quantum codes. We explore the question of how one can achieve fault- tolerant quantum computation with topological codes. We treat quantum error-correcting codes not only as a compelling ingredient needed to build a quantum computer, but also as a useful theoretical tool in other areas of physics. In particular, we explore what insights topological codes can provide into challenging questions, such...

Flashover of Insulation in Homogenous Electric Fields

George K. Surrapas Diamos & William Abbett Lewis
No Abstract.

Colonization of the Intestinal Surface by Indigenous Microbiota

Gregory Paul Donaldson
The mammalian gut evolved to foster the development and maintenance of a community of specific bacterial symbionts that persist for years. Bacteroides fragilis is one of a number of species that are able to colonize the mucus of the large intestine in mice and humans. This thesis explores the mechanisms and functions of mucosal colonization, most notably by using reductionist approaches with gnotobiotic mice. Harnessing genetics on both the host and microbial side allowed the...

TCCON data from Hefei (PRC), Release GGG2014.R0

Cheng Liu, Wei Wang, Youwen Sun & ,
The Total Carbon Column Observing Network (TCCON) is a network of ground-based Fourier Transform Spectrometers that record direct solar absorption spectra of the atmosphere in the near-infrared. From these spectra, accurate and precise column-averaged abundances of atmospheric constituents including CO2, CH4, N2O, HF, CO, H2O, and HDO, are retrieved. This data set contains observations from the TCCON station at Hefei (PRC).

Theoretical Foundations for Quantum Measurement in a General Relativistic Framework

Belinda Heyun Pang
In this work, we develop theoretical formulations to analyze experimentally relevant quantum measurement schemes in a general relativistic framework, and discuss their implications versus the Newtonian or non-relativistic viewpoints. Specifically, we address (i) matter waves in simple free fall, (ii) the Mach-Zehdner atom interferometer with light-matter interaction and (iii) optomechanical systems. The motivation is to explore the regime of physics where gravity and relativistic effects become pertinent for quantum experiments due to the increase in...

Fitting Convex Sets to Data: Algorithms and Applications

Yong Sheng Soh
This thesis concerns the geometric problem of finding a convex set that best fits a given dataset. Our question serves as an abstraction for data-analytical tasks arising in a range of scientific and engineering applications. We focus on two specific instances: 1. A key challenge that arises in solving inverse problems is ill-posedness due to a lack of measurements. A prominent family of methods for addressing such issues is based on augmenting optimization-based approaches with...

Evaporation From Lakes

Nephi Willard Cummings
Evaporation can be determined by the aid of the first law of thermodynamics in such a way that wind velocity need not enter the calculation. Air temperature and humidity enter only as terms in a correction which can have a relatively small average value under typical conditions. A method of finding the difference between incoming and outgoing radiation, from observations on a well insulated pan is described, and also a method of finding the ratio...

Self-Gluing Formula of the Monopole Invariant and its Application on Symplectic Structures

Gahye Jeong
Seiberg-Witten theory has been an important tool in studying a class of 4-manifolds. Moreover, the Seiberg-Witten invariants have been used to compute for simple structures of symplectic manifolds. The normal connected sum operation on 4- manifolds has been used to construct 4-manifolds. In this thesis, we demonstrate how to compute the Seiberg-Witten invariant of 4-manifolds obtained from the normal connected sum operation. In addition, we introduce the application of the formula on the existence of...

The Discovery of Novel Materials for the Electrocatalytic Reduction of Carbon Dioxide

Daniel Anthony Torelli
The removal of atmospheric carbon dioxide is likely the only route to mitigating the effects of decades of increased fossil fuel combustion. Artificial photosynthesis presents one method for removal and conversion of problematic carbon dioxide into chemically useful products. By coupling electrochemical CO2 reduction (CO2R) to a renewable energy source atmospheric CO2 could be converted back into a fuel such as ethanol, or a commodity chemical such as ethylene. These products could then be consumed...

Thesis Plate 1: Preliminary geologic map of the southern Naukluft Mountains

Daven P Quinn
Web map of the southern part of the Naukluft Mountains created from fieldwork in 2015 and 2016.

Decoding the Regulatory Genome: Quantitative Analysis of Transcriptional Regulation in Escherichia coli

Stephanie Loos Barnes
Over the past decades DNA sequencing has become significantly cheaper and faster, which has enabled the accumulation of a huge amount of genomic data. However, much of this genomic data is illegible to us. For noncoding regions of the genome in particular, it is difficult to determine what role is played by specific DNA sequences. Here we focus on regions of DNA that play a role in transcriptional regulation. We develop models and techniques that...

The Kapustin-Witten Equations with Singular Boundary Conditions

Siqi He
Witten proposed a fasinating program interpreting the Jones polynomial of knots on a 3-manifold by counting solutions to the Kapustin-Witten equations with singular boundary conditions. In Chapter 1, we establish a gluing construction for the Nahm pole solutions to the Kapustin-Witten equations over manifolds with boundaries and cylindrical ends. Given two Nahm pole solutions with some convergence assumptions on the cylindrical ends, we prove that there exists an obstruction class for gluing the two solutions...

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