6,755 Works

Extensional tectonics in the Basin and Range province and the geology of the Grapevine Mountains, Death Valley region, California and Nevada

Nathan Alan Niemi
Geologic mapping provides structural and stratigraphic observations which lead to new insights into the magnitude, timing, and rate of Cenozoic extensional tectonism in the Death Valley region of the Basin and Range province in the western United States. Detailed mapping of the Grapevine Mountains, in northeastern Death Valley, yields new information on the structural evolution of the Titus Canyon anticline, a west-vergent fold of the Cordilleran thrust belt. The Grapevine Mountains contain the longest exposure...

Energetic Protons in the Magnetosphere of Neptune

Mark Dixon Looper
The Cosmic Ray Subsystem aboard Voyager 2 measured large fluxes of trapped energetic protons and electrons in the inner magnetosphere of Neptune during the 1989 flyby; the protons above 1.9 MeV observed by the Low Energy Telescopes are analyzed in this thesis. Proton events are extracted from pulse-height distributions dominated by low-energy electron pileup noise, and fluxes are calculated with corrections for discriminator deadtime. Theoretical models for satellite absorption of charged particles are adapted to...

Airships: A New Horizon for Science

Sarah H. Miller, Robert Fesen, Lynne A. Hillenbrand, Jason Rhodes, Gil Baird, Geoffrey A. Blake, Jeff Booth, David E. Carlile, Riley Duren, Frederick G. Edworthy, Brent Freeze, Randall R. Friedl, Paul F. Goldsmith, Jeffery L. Hall, Scott E. Hoffman, Scott E. Hovarter, Rebecca M. Jensen-Clem, Ross M. Jones, Jens Kauffmann, Alina Kiessling, Oliver G. King, Nick P. Konidaris, Timothy L. Lachenmeier, Steven D. Lord, Jessica Neu … & Thomas Zambrano
The "Airships: A New Horizon for Science" study at the Keck Institute for Space Studies investigated the potential of a variety of airships currently operable or under development to serve as observatories and science instrumentation platforms for a range of space, atmospheric, and Earth science. The participants represent a diverse cross-section of the aerospace sector, NASA, and academia. Over the last two decades, there has been wide interest in developing a high altitude, stratospheric lighter-than-air...

Theoretical Studies of Intramolecular Dynamics and Energy Redistribution

Gregory Alan Voth
By virtue of various theoretical techniques, the fundamental mechanisms responsible for intramolecular vibrational energy redistribution (IVR) in isolated molecules are studied in this thesis. One such mechanism, the nonlinear resonance, is examined in some detail for several systems. In particular, nonlinear stretch-bend resonances in a series of isotopically substituted methanes are predicted to have a large effect on the spectral properties of those molecules. By using a semiclassical analysis, the general properties of stretch-bend interactions...

I. On the initial value problems of radiation and scattering of water waves by immersed obstacles. II. Gravity waves due to a point disturbance in a stratified flow

Chiang Chung Mei
I. Some initial value problems are studied regarding the radiation and scattering of gravity waves by finite bodies in an infinitely deep ocean. Emphasis is placed on the case where a finite number of thin plates lie on a vertical line, for which the general solution is obtained by transforming the boundary value problem to one of the Riemann-Hilbert type. Explicit investigations are made for the large time behavior of the free surface elevation for...

Composite Grid Construction and Applications

Geoffrey Samuel Chesshire
For many problems that involve the discrete representation of a function on a two-dimensional region, a single rectangular grid is inappropriate. However, any compact region with a smooth boundary can be discretised using a composite grid, which provides boundary-fitted coordinates and allows stretched coordinates for boundary layers and internal layers wherever these are needed. We have developed interactive software for specifying composite grids, and general-purpose subroutines for using them in discretising PDE boundary-value problems. The...

I. Reactions of non-activated aryl halides with strong basic and nucleophilic agents. II. Evidence for cyclohexene as an intermediate in the coupling reaction of phenyllithium with 1-chlorocyclohexene. III. Reactions of non-activated aryl halides with strong bases at high temperatures. IV. The synthesis of some four-membered ring compounds

Franco Scardiglia
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Part I. Previous studies have shown that non-activated aryl halides are aminated by alkali amides in liquid ammonia by the way of a benzyne intermediate. Nucleophilic substitution products are formed with some strong bases and aryl halides in liquid ammonia, provided alkali amides are present. A study of the mechanism and the scope of such reactions...

Search for scalar leptons at LEP with the L3 detector

Lei Xia
In this thesis, I present a search for scalar leptons in e+e- annihilation using the L3 detector at LEP. Data collected in 1999 and 2000, at center-of-mass energies between 192 GeV and 208 GeV, was used in this analysis. This work covered the scalar lepton searches in both SUGRA and GMSB models. To achieve this analysis, a parametrized selection was developed to handle the different event signatures in SUGRA models. Improvement of the L3 simulation...

Nanowicking: multi-scale flow interaction with nanofabric structures

Jijie Zhou
Dense arrays of aligned carbon nanotubes are designed into strips — nanowicks — as a miniature wicking element for liquid delivery and potential microfluidic chemical analysis devices. The delivery function of nanowicks enables novel fluid transport devices to run without any power input, moving parts or external pump. The intrinsically nanofibrous structure of nanowicks provides a sieving matrix for molecular separations, and a high surface-to-volume ratio porous bed to carry catalysts or reactive agents. This...

Radial pn Junction, Wire Array Solar Cells

Brendan Melville Kayes
Radial pn junctions are potentially of interest in photovoltaics as a way to decouple light absorption from minority carrier collection. In a traditional planar design these occur in the same dimension, and this sets a lower limit on absorber material quality, as cells must both be thick enough to effectively absorb the solar spectrum while also having minority-carrier diffusion lengths long enough to allow for efficient collection of the photo-generated carriers. Therefore, highly efficient photovoltaic...

Coupled-resonator optical waveguides and multiplexed solitons

Shayan Mookherjea
Whether over micron-long or kilometer-long distances, periodic phenomena can strongly affect both the propagation and the confinement of optical pulses. Periodicities can be engineered through the structural design of optical waveguides, or they may manifest self-consistently from induced nonlinear polarizations. In light of recent developments in fabrication technologies for semiconductor waveguides, polymeric materials, and optical fiber, we show that both strongly- and weakly-nonlinear channels are promising for new devices and systems in optical communications. This...

Dynamics and Correlated Noise in Gene Regulation

Mary Julia Dunlop
Gene regulatory interactions are context dependent, active in some cell types or cellular states but not in others. In this thesis we present a method for determining when a regulatory link is active given temporal measurements of gene expression. Correlations in time-series data are used to determine how genes influence each other and their causal relationships. Natural stochastic noise is shown to aid in the process of network identification by perturbing the expression of genes;...

TCCON data from Ny Ålesund, Spitsbergen (NO), Release GGG2014.R1

J. Notholt, T. Warneke, C. Petri, N. M. Deutscher, C. Weinzierl, M. Palm & M. Buschmann

These data are now obsolete and should be replaced by the most recent data: https://doi.org/10.14291/tccon.ggg2014.nyalesund01.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 Ny...

TCCON data from Orléans (FR), Release GGG2014.R1

T. Warneke, J. Messerschmidt, J. Notholt, C. Weinzierl, N. M. Deutscher, C. Petri & P. Grupe
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 Orléans, France.

TCCON data from Lauder (NZ), Release GGG2014.R0

David Frank Pollard, John Robinson & Hisako Shiona
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 Lauder (NZ).

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 Bremen (DE), Release GGG2014.R1

J. Notholt, C. Petri, T. Warneke, N. M. Deutscher, M. Palm, M. Buschmann, C. Weinzierl, R. C. Macatangay & P. Grupe
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 Bremen, Germany.

TCCON data from Bialystok (PL), Release GGG2014.R2

N. M. Deutscher, J. Notholt, J. Messerschmidt, C. Weinzierl, T. Warneke, C. Petri & P. Grupe
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 Bialystok, Poland.

Aerodynamic Forces on a Propeller in Non-Stationary Motion

Harold Miller DeGroff
The non-stationary lift and moment of an oscillating propeller blade element are determined. The solutions are obtained in the form of double definite integrals which are evaluated for one numerical example in Appendix A. The three-dimensional nature of the problem is accounted for by determination of the induced velocity field due to an approximate vorticity distribution in the propeller wake. The corresponding blade element circulation is calculated by means of the classical Munk integral theorem....

Numerical Shock Propagation Using Geometrical Shock Dynamics

Donald William Schwendeman
Various numerical schemes are developed to calculate the motion of shock waves in gases based on Whitham's theory of geometrical shock dynamics. The basic numerical scheme is used to study the propagation of two-dimensional shock waves along walls and in channels, and the self-focusing of initially curved shock- fronts. This scheme is extended to treat shock wave motion in non-uniform media. The extended scheme is used to examine shock wave refraction at both planar and...

The Abundance and Behavior of Viruses in Ancient Seawater and Modern Iron-rich Environments

Hanna Ken-Yuin Liu
The proclivity of silica for ferric hydroxide sorption sites allows for an Archean iron cycle involving iron-silica co-precipitation and deposition of banded iron formations (BIF). Considering the tendency of viruses to also sorb iron, here we investigate the possibility that viruses were involved in the iron cycle and potentially deposited in BIFs. A known concentration of Syn33a cyanophages was introduced into each media and the viral particles remaining in solution after a short centrifugation were...

Where Tori fear to tread : hypermassive neutron star remnants and absolute event horizons Or topics in computational general relativity

Jeffrey Daniel Kaplan
Computational general relativity is a field of study which has reached maturity only within the last decade. This thesis details several studies that elucidate phenomena related to the coalescence of compact object binaries. Chapters 2 and 3 recounts work towards developing new analytical tools for visualizing and reasoning about dynamics in strongly curved spacetimes. In both studies, the results employ analogies with the classical theory of electricity and magnitism, first (Ch. 2) in the post-Newtonian...

Measurement, Simulation, and Design of the Dispersion-Engineered Traveling-Wave Kinetic Inductance Amplifier

Saptarshi Chaudhuri
Recently, Eom et al. [1 J proposed a new concept for a low-noise cryogenic amplifier known as a Dispersion-Engineered Traveling-Wave Kinetic Inductance (DTWKI) amplifier. This device exploits the nonlinear kinetic inductance of superconducting thin-film nitrides to achieve high gain-bandwidth, near quantum-limited noise, and excellent dynamic range. In this thesis, we describe recent progress toward an experimental realization of the DTWKI; in particular, we focus on improvements in the areas of gain-bandwidth and noise performance. We...

Mode I, Plane Stress Crack Initiation and Growth in Elastic-Plastic Solids: A Finite Element Analysis

Narasimhan Ramarathnam
A detailed finite element analysis of crack initiation and stable crack extension is performed under Mode I plane stress, small-scale yielding conditions. A small strain, J2 incremental plasticity theory is employed and both elastic-perfectly plastic materials and power law hardening materials are considered. Some issues pertaining to the stationary plane stress crack problem, such as the range of dominance of the asymptotic stress and deformation fields and the amount of non-proportional loading near the crack...

Structural, stratigraphic, and geochronologic analysis of the Alexander-Taku terrane boundary and the overlapping upper Jurassic to lower Cretaceous gravina sequence, southeast Alaska

Charles Martin Rubin
An imbricate thrust belt that extends along strike for over 2000 km overprints the tectonic boundary between two of the largest allochthonous crustal fragments (Intermontane and Insular superterranes) in the North American Cordillera and affects rocks west of the Coast Plutonic Complex in southeast Alaska, western British Columbia and northern Washington. Deformation was broadly coeval with mid-Cretaceous magmatism and involved the emplacement of west-directed thrust nappes over a structurally intact and relatively unmetamorphosed basement. The...

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