2,527 Works

Critical Photoelectric Potential of Clean Mercury and the Influence of Gases and the Circulation of Mercury Upon It

Wayne Brockbank Hales
The apparatus used by Kazda and Dunn for the determination of the critical photo electric potential of mercury has been completely reconstructed. The stop cocks, the grease of which was the source of contaminating vapors, have been replaced by mercury cut offs and the high temperature cement used in the construction of the photo cell has been replaced by a graduated quartz-pyrex seal. Fresh clean mercury was returned to the still. With this new apparatus...

Self-healing Techniques for RF and mm-Wave Transmitters and Receivers

Kaushik Dasgupta
With continuing advances in CMOS technology, feature sizes of modern Silicon chip-sets have gone down drastically over the past decade. In addition to desktops and laptop processors, a vast majority of these chips are also being deployed in mobile communication devices like smart-phones and tablets, where multiple radio-frequency integrated circuits (RFICs) must be integrated into one device to cater to a wide variety of applications such as Wi-Fi, Bluetooth, NFC, wireless charging, etc. While a...

Fast Adaptive Augmented Lagrangian Digital Image Correlation

Jin Yang
Digital image correlation (DIC) is a powerful experimental technique for measuring full-field displacement and strain. The basic idea of the method is to compare images of an object decorated with a speckle pattern before and after deformation in order to compute the displacement and strain fields. Local Subset DIC and finite element-based Global DIC are two widely used image matching methods; however there are some drawbacks to these methods. In Local Subset DIC, the computed...

The Neurocomputational Basis of Self-Control Success and Failure

Nicolette Jean Sullivan
Individuals often have difficulty delaying gratification – that is, forging smaller sooner rewards in favor of larger rewards delivered at a delay. Common examples of this deficit in self-control are difficulties in saving for retirement, going to the gym, or eating healthy foods. Despite an extensive literature on the neural substrates of decision-making, relatively little is still known about the sources of underlying individual variation in the ability to successfully execute self-control. This manuscript presents...

I: Normal Faulting on the Austroalpine ‘Overthrust’ Constrained by Thermochronometry and Kinematic Analysis, Central Alps, Graubünden Region, Switzerland. II: Clumped Isotope Thermometry of Carbonate Phases Associated with the Copper Deposits of Kennecott, Alaska

Jason Brian Price
I. A compilation of 362 cooling ages, including 52 newly reported in this study, from nine thermochronometric systems, 40K/39Ar amphibole, 40K/39Ar white mica, 87Rb/86Sr white mica, 40K/39Ar biotite, 87Rb/86Sr biotite, zircon and apatite fission track, zircon and apatite (U-Th)/He, indicate that the base of the Austroalpine allochthonous ‘orogenic lid’ was not in full thermal equilibrium with its Penninic substrate until at least the middle Oligocene, approximately 29-28 Ma, to allowably as late as the early...

A systems approach to cardiovascular health and disease with a focus on aortic wave dynamics

Niema Mohammed Pahlevan
Cardiovascular diseases (CVDs) have reached an epidemic proportion in the US and worldwide with serious consequences in terms of human suffering and economic impact. More than one third of American adults are suffering from CVDs. The total direct and indirect costs of CVDs are more than $500 billion per year. Therefore, there is an urgent need to develop noninvasive diagnostics methods, to design minimally invasive assist devices, and to develop economical and easy-to-use monitoring systems...

Applications of Nuclear Resonant Scattering to Further Our Understanding of Earth’s Interior

Dongzhou Zhang
The elastic and the thermodynamic properties of minerals under extreme P-T conditions are of general importance to the geodynamic modeling and the interpretation of seismic-wave observations. An accurate laboratory determination of these properties provides constraints to determine the composition and temperature of Earth's interior. In this thesis, I focus on the application of nuclear resonant scattering, an advanced synchrotron based spectroscopic technique, to further our understanding of candidate materials in Earth's interior. Specific examples include...

Addressing Thermodynamic Inefficiencies of Hydrogen Storage in Transition Metal Hydrides

Nicholas Joseph Weadock
Transition metal hydrides (MH) are an attractive class of materials for several energy technologies. Primary benefits include their large volumetric storage capacity (often exceeding that of liquid hydrogen) and capability to absorb and desorb hydrogen for hundreds of cycles. In this thesis, we set out to understand two of the thermodynamic inefficiencies of MH: the pressure hysteresis associated with hydrogen absorption and desorption and the corrosion and dissolution of high capacity MH alloys in high...

Optimal Data Distributions in Machine Learning

Carlos Roberto González Palacios
In the first part of the thesis we explore three fundamental questions that arise naturally when we conceive a machine learning scenario where the training and test distributions can differ. Contrary to conventional wisdom, we show that in fact mismatched training and test distribution can yield better out-of-sample performance. This optimal performance can be obtained by training with the dual distribution. This optimal training distribution depends on the test distribution set by the problem, but...

Ultra High Frequency Oscillators

Andrew Vasily Haeff
No abstract.

Two Roads to Planet Detection

Michael Bottom
One of the most exciting discoveries in astrophysics of the last last decade is of the sheer diversity of planetary systems. These include "hot Jupiters", giant planets so close to their host stars that they orbit once every few days; "Super-Earths", planets with sizes intermediate to those of Earth and Neptune, of which no analogs exist in our own solar system; multi-planet systems with planets smaller than Mars to larger than Jupiter; planets orbiting binary...

Dynamic Regulations of Co-translational Protein Targeting by the Signal Recognition Particle Receptor in E. coli and Human

Yu-Hsien Hwang-Fu
The Signal Recognition Particle (SRP) and its receptor (SR) co-translationally deliver the majority of secretory and membrane proteins to their membrane destinations. SRP recognizes and binds to the cargo, and SR recruits the transit complex to the target membrane. Precise timing and coordination are encoded into the interactions between SRP and SR in response to the cargo and environment to enable efficient and accurate targeting. This dissertation explores the regulation mechanisms of SRP membrane recruitment...

Data: Implications for Markets and for Society

Juba Ziani
Every day, massive amounts of data are gathered, exchanged, and used to run statistical computations, train machine learning algorithms, and inform decisions on individuals and populations. The quick rise of data, the need to exchange and process it, to take data privacy concerns into account, and to understand how it affects decision-making, introduce many new and interesting economic, game theoretic, and algorithmic challenges. The goal of this thesis is to provide theoretical foundations to approach...

Spontaneous and Stimulated Light Emission due to Radiative Recombination in Forward Biased Lead Telluride P-N Junctions

Peter John Andrew Zoutendyk
Since the discovery in 1962 of laser action in semiconductor diodes made from GaAs, the study of spontaneous and stimulated light emission from semiconductors has become an exciting new field of semiconductor physics and quantum electronics combined. Included in the limited number of direct-gap semiconductor materials suitable for laser action are the members of the lead salt family, i.e . PbS, PbSe and PbTe. The material used for the experiments described herein is PbTe ....

Biophysical Characterization of an ABC L-methionine Transporter

Qi Wen Li
The ATP-binding cassette (ABC) superfamily is pivotal to a number of important biochemical processes and ubiquitous in all kingdoms of life. Previous studies of ABC transporters have been heavily focused on the structural determination of the different intermediates of the transport cycle. In order to characterize the mechanism of an E. coli L-methionine transporter, which is an ABC importer, we first collated previously reported structural information on the conformational states of several well characterized ABC...

Cloud Computing Services for Seismic Networks

Michael James Olson
This thesis describes a compositional framework for developing situation awareness applications: applications that provide ongoing information about a user's changing environment. The thesis describes how the framework is used to develop a situation awareness application for earthquakes. The applications are implemented as Cloud computing services connected to sensors and actuators. The architecture and design of the Cloud services are described and measurements of performance metrics are provided. The thesis includes results of experiments on earthquake...

Engineering Resilient Space Systems

Richard M. Murray, John C. Day, Michel D. Ingham, Leonard J. Reder & Brian C. Williams
Several distinct trends will influence space exploration missions in the next decade. Destinations are becoming more remote and mysterious, science questions more sophisticated, and, as mission experience accumulates, the most accessible targets are visited, advancing the knowledge frontier to more difficult, harsh, and inaccessible environments. This leads to new challenges including: hazardous conditions that limit mission lifetime, such as high radiation levels surrounding interesting destinations like Europa or toxic atmospheres of planetary bodies like Venus;...

Towards a Net-zero Carbon Energy System: High Efficiency Photovoltaics and Electrocatalysts

Stefan Thomas Omelchenko
Modern society is dependent on energy. Despite increases in energy efficiency, human development and economic goals are expected to increase the global demand for energy by almost 30% in the next 20 years. At the same time, anthropogenic carbon dioxide emissions must approach zero to stabilize global temperatures below the 2°C target set out by international climate agreements. Realizing a net-zero carbon energy system will depend on the development of a highly reliable, sustainable electricity...

Discrete Modeling of Granular Media: A NURBS-based Approach

Keng-Wit Lim
This dissertation is concerned with the development of a new discrete element method (DEM) based on Non-Uniform Rational Basis Splines (NURBS). With NURBS, the new DEM is able to capture sphericity and angularity, the two particle morphological measures used in characterizing real grain geometries. By taking advantage of the parametric nature of NURBS, the Lipschitzian dividing rectangle (DIRECT) global optimization procedure is employed as a solution procedure to the closest-point projection problem, which enables the...

Caught in the Middle: Homosexual Guilt, Liminality, and the role of the 'Novel of Identification' in Post-World War, Pre-Stonewall America

Michael Anthony Goulet
The 1950s and 1960s are often regarded as a transitory time period for the American homosexual man, overshadowed by the end of World War II and the tumultuous and radically influential Gay liberation movement beginning in the 1970s. The time period is marked by the publication and increased scrutiny of several influential novels: Christopher Isherwood's A Single Man (1964), Chester Himes's Yesterday Will Make You Cry (1937), James Baldwin's Giovanni’s Room (1956), and Gore Vidal's...

TCCON data from Eureka (CA), Release GGG2014.R3

K. Strong, S. Roche, J. E. Franklin, J. Mendonca, E. Lutsch, D. Weaver, P. F. Fogal, J. R. Drummond, R. Batchelor & R. Lindenmaier

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 Eureka, Canada.

TCCON data from Edwards (US), Release GGG2014.R1

L. T. Iraci, J. R. Podolske, P. W. Hillyard, C. Roehl, P. O. Wennberg, J.-F. Blavier, J. Landeros, N. Allen, D. Wunch, J. Zavaleta, E. Quigley, G. B. Osterman, R. Albertson, K. Dunwoody & H. Boyden
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 Edwards, U.S.A..

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