498 Works

Coherent Structures, their Interactions, and their Effects on Passive Scalar Transport and Aero-optic Distortion in a Turbulent Boundary Layer

Theresa Ann Saxton-Fox
This thesis focused on the characterization of coherent structures and their interactions in a turbulent boundary layer using data from particle image velocimetry (PIV) measurements performed at Caltech and from a direct numerical simulation (DNS) of Wu et al. (2017). Connections were identified between instantaneous and statistical descriptions of coherent velocity structures, through the analysis of representative models for their structures derived from the resolvent analysis of McKeon and Sharma (2010). The representative models were...

Discovery and Development of Small-Molecule Modulators for the Sulfation of Glycosaminoglycans and Studying the Role of O-GlcNAc on CREB through Semisynthesis

Sheldon Ting Fong Cheung
Glycosaminoglycans (GAGs) are sulfated polysaccharides that play key roles in many cellular processes, ranging from viral invasion and cancer metastasis to neuronal development. Their diverse biological activities stem from their complex sulfation patterns, which are tightly regulated in vivo. For instance, the GAG chondroitin sulfate (CS) has been shown to undergo regiochemical sulfation during development and after spinal cord injury. However, few tools exist to modulate specific GAG sulfation patterns and study their importance in...

Egospace Motion Planning Representations for Micro Air Vehicles

Anthony Thomas Fragoso
Navigation of micro air vehicles (MAVs) in unknown environments is a complex sensing and trajectory generation task, particularly at high velocities. In this work, we introduce an efficient sense-and-avoid pipeline that compactly represents range measurements from multiple sensors, trajectory generation, and motion planning in a 2.5–dimensional projective data structure called an egospace representation. Egospace coordinates generalize depth image obstacle representations and are a particularly convenient choice for configuration flat mobile robots, which are differentially flat...

Cell-Selective Chemoproteomics for Biological Discovery

Shannon Elizabeth Stone
Cellular protein synthesis changes rapidly in response to internal and external cues in ways that vary from cell to cell. Global proteomic analyses of microbial communities, tissues, and organisms have provided important insights into the behavior of such systems, but can obscure the diversity of responses characteristic of different cellular subpopulations. Recent advances in cell-specific proteomics—fueled in part by the development of bioorthogonal chemistries, more sensitive mass spectrometers and more advanced mining algorithms—have yielded unprecedented...

New Techniques for Noble Gas Geochronometry and Thermochronometry

Stephen Ellis Cox
Noble gases were among the first species measured by mass spectrometry and interrogated for geochemical information about the solid Earth. The analytical challenge of measuring them has driven technological development in the field, and new applications have in turn followed from new developments. In the first chapter, I present developments that bolster an existing technique, the (U–Th)/Ne system, by verifying the theoretical underpinnings of the method and by exploring its application in several minerals. In...

Hydrodynamics of Insects. Part 1. Jetting of the Dragonfly Larvae. Part 2. Honeybee at the Air-water Interface: Surfing with the Capillary Wave

Chris Roh
This thesis presents the study on the hydrodynamics of two insects commonly known for their aerial adaptation: the dragonfly and the honeybee. Part 1: Anisopteran dragonflies live underwater in their larval stages. The key factor for their aquatic adaptation is the modified hindgut chamber that is used as a pump. The two main functions of this biological pump are jet propulsion and respiration. Both functions involve jetting and refilling of the chamber through an orifice...

Glacial Ocean Dynamics: Insight from Deep-Sea Coral Reconstructions and A Time-Dependent Dynamical Box Model

Sophia Katharine Vizza Hines
Glacial-interglacial cycles, occurring at a period of approximately 100,000 years, have dominated Earth's climate over the past 800,000 years. These cycles involve major changes in land ice, global sea level, ocean circulation, and the carbon cycle. While it is generally agreed that the ultimate driver of global climate is changes in insolation, glacial cycles do not look like insolation forcing. Notably, there is a highly non-linear warming response at 100,000 years to a relatively small...

Insights on the Formation and Fate of Organic Nitrates in the Atmosphere from Field and Laboratory Observations

Alexander Pai-Chung Teng
Alkenes are oxidized rapidly in the atmosphere by addition of OH and subsequently O2, leading to the formation of peroxy radicals. These peroxy radicals react with NO to form organic nitrates through a minor radical-terminating branching pathway. Over large regions of the continental boundary layer, the formation of organic nitrates control tropospheric ozone and the lifetime of NOx. Laboratory investigations described herein show that the yield of nitrates through this pathway is larger than previously...

Terahertz and Microwave Spectroscopy of Liquids and Hydrogen-Bonded Clusters

Ian Alan Finneran
The microwave (MW, 0.3-100 GHz) and terahertz (THz, 0.1-10 THz) regions of the electromagnetic spectrum are replete with a rich set of molecular motions, including soft inter- and intramolecular vibrations, torsions, and rotations. At room temperature these motions are well populated, and play an active role in condensed-phase chemistry on Earth. This work details the development of one MW and two THz spectrometers along with their application to the study of liquids and hydrogen-bonded clusters....

Membrane Potential Dynamics of Hippocampal Neurons During Ripples in Awake Mice

Bradley Kline Hulse
During periods of slow wave sleep and quiet wakefulness, the hippocampal formation generates spontaneous population bursts that are organized as a high-frequency “ripple” oscillation. The neurons that participate in these bursts often replay previously experienced activity patterns encoded during alert behavior, and interfering with ripple generation produces deficits in learning and memory tasks. For these reasons, ripples play a prominent role in theories of memory consolidation and retrieval. While spiking during ripples has been extensively...

Surface Drawing

Computer Science Technical Reports

Essays on the Impact of Information Asymmetry

Myungkoo Song
This dissertation consists of three essays focusing on how information asymmetry affects agents’ behavior across different environments. The first essay characterizes the optimal contract when a firm can employ two incentive schemes, promotion and pay for performance, simultaneously (Chapter 2). In the second essay, I study how information asymmetry can lead a firm to choose a less profitable short-term over a more profitable long-term project (Chapter 3). The other essay analyzes a career choice problem...

Microbial Evolution and the Rise of Oxygen: The Roles of Contingency and Context in Shaping the Biosphere through Time

Lewis Michael Ward
We are shaped by our environment, but we then shape it in turn. This interplay between life and the Earth, and how these interactions have shaped both parties through time, is the heart of the discipline of geobiology. My research is fundamentally motivated by a desire to understand how life and the Earth have changed together through time to reach the state that they’re at today, and to understand from this history how the coevolution...

2012 TCCON Data Release Auxiliary Files

Total Carbon Column Observing Network (TCCON) Team
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 is the auxiliary files for the 2012 data release.

2009 TCCON Data Release

Total Carbon Column Observing Network (TCCON) Team
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 is the 2009 data release.

TCCON data from Eureka (CA), Release GGG2014.R2

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

These data are now obsolete and should be replaced by the most recent data: https://doi.org/10.14291/tccon.ggg2014.eureka01.R3

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...

TCCON data from Park Falls (US), Release GGG2014.R1

P. O. Wennberg, C. M. Roehl, D. Wunch, G. C. Toon, J.-F. Blavier, R. Washenfelder, G. Keppel-Aleks, N. T. Allen & J. Ayers
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 Park Falls, U.S.A..

TCCON data from Réunion Island (RE), Release GGG2014.R1

M. De Mazière, M. K. Sha, F. Desmet, C. Hermans, F. Scolas, N. Kumps, J.-M. Metzger, V. Duflot & J.-P. Cammas
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 on Réunion Island.

2014 TCCON Data Release

Total Carbon Column Observing Network (TCCON) Team
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 is the 2014 data release.

TCCON data from East Trout Lake, SK (CA), Release GGG2014.R0

D. Wunch, J. Mendonca, O. Colebatch, N. T. Allen, J.-F. Blavier, S. Springett, G. Neufeld, K. Strong, R. Kessler & D. Worthy

These data are now obsolete and should be replaced by the most recent data: https://doi.org/10.14291/tccon.ggg2014.easttroutlake01.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 East...

2009 TCCON Data Release Auxiliary Files

Total Carbon Column Observing Network (TCCON) Team
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 is the 2009 data release auxiliary files.

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