460 Works

New-to-Nature Selective C-H Alkylation Using Engineered Carbene Transferases

Juner Zhang
Synthetic methods to selectively convert C–H bonds, a prevalent motif in organic molecules, into functionalities can significantly accelerate the syntheses and derivatization of molecules. In the past decade, many enzymatic catalysts have emerged as greener, more selective, and more versatile alternatives to small-molecule catalysts for selective C–H functionalization reactions. In nature, enzymes only catalyze a limited set of C–H functionalization reactions that are useful for chemical synthesis, as the overwhelming majority of known C–H functionalization...

A Multi-Disciplinary Approach: How Aqueous Minerals Hold the Key to Understanding the Climate and Habitability of Terrestrial Planets

Eva L. Scheller
Understanding the interplay between geological processes and the climate within the ancient pasts of terrestrial planets holds the key to deciphering what makes terrestrial planets habitable. The climates of both Mars and Earth were drastically different in their ancient pasts. Liquid water once flowed on Mars ~3-4 Ga, creating fluvial valleys and aqueous minerals, until Mars dried out to the desert planet we know today. During the Pleistocene (~ 2.6 Ma – 11.7 ka) and...

Analytical Chemistry Investigations Toward Understanding the Mechanism of Nitrogenase from Azotobacter vinelandii and the Role of the 4Fe-4S Cluster of Dna2 from Saccharomyces cerevisiae

Siobhán Gaustad MacArdle
Iron sulfur clusters are ubiquitous metal cofactors that play a variety of roles in many enzymes important for health and the climate. The bacterial nitrogenase enzyme, which supports the growth of all organisms by converting atmospheric dinitrogen into ammonia, contains three different redox-active iron sulfur clusters that are central to its function. Dna2, found in all eukaryotes, is integral to genome maintenance and coordinates an iron sulfur cluster of unknown function. Many details of the...

Theory of Mathematical Optimization for Delegated Portfolio Management

Zijian Tao
We study the optimization problem of finding closed convex sets Γ ⊆ Rd containing the origin that minimize F(Γ) = ∑i=1k wi | θi/2 - pΓ(θi) | 2, where w1, ..., wk > 0, θ1, ..., θk in Rd are given, and pΓ(θi) are the closest points in Γ to θi, i = 1, ..., k. This problem is motivated by the topic of delegated portfolio management in finance. In Chapter 2, we will explore...

Between Seismic Speed and Glacial Pace: Cryoseismic Observation of Intermediate-Scale Processes at Lemon Creek Glacier, Alaska

Celeste Ritter Labedz
In this thesis, I present three studies in environmental seismology. First, I present an analysis of seismic tremor generated from subglacial water flow during the rapid drainage of an ice-marginal supraglacial lake, collected by an on-ice nodal seismic array. I find that seismic tremor indicates a partial pressurization of the subglacial hydrologic system that was not accompanied by the expected change in glacier surface velocity, suggesting that factors like glacier geometry play a significant role...

Innate Navigation: Magnetic Sensation and Maze Learning

Matthew H. Rosenberg
This thesis aims to advance the understanding of the neurobiology of navigation through the investigation of two topics: magnetic sensation and maze navigation. The central question of this work may be framed as follows: how do animals find their way to key resources that are necessary for survival? Three projects are presented to address this. Chapter II explores a sensory hypothesis that some animals may navigate long distances by directly sensing the earth’s magnetic field....

Surveying Notions of Queer Asian American Community Through Literature: 1972–1998

Yun Emily Du
The history of queer Asian America has, to date, largely been studied as a history of organizations. This has lent a particular tilt to both the preservation and the study of queer Asian America: the activism of the late 20th century has been archivally and academically preserved, while records of everyday queer Asian American experiences -- of the ways individuals discovered their identities, formed communities, found loves, and filled their days -- have been more...

Interface Optimization for Improved Photovoltaic Devices

Rebecca Denise Glaudell
The wide band gaps and superior conductivity of ZnSₓSe₁₋ₓ semiconductors to amorphous Si suggest an alternative carrier-selective contact in silicon heterojunction solar cells. Electron-selective ZnSₓSe₁₋ₓ front contacts on p-type c-Si solar cells are explored by simulating in Sentaurus TCAD a large design parameter space informed by experimentally determined optoelectronic properties. Comparable performance to experimental and simulated p-SHJ reference devices is shown, with a champion simulated device efficiency of 20.8%. X-ray photoelectron spectroscopy is used to...

Lemon Creek Glacier 2017 Seismic Full Resolution

Celeste Labedz
Full-resolution seismic data from the July 2017 nodal deployment on Lemon Creek Glacier, Alaska

Iodine and Plutonium dataset

Weiyi Liu
1. FPMD calculation results 2. Xe meteoritic data and MC results

From Building Blocks to Theories: EFThedron and a Haagerup TFT

Tzu-Chen Huang
This thesis is dedicated to the study of certain building blocks of scattering amplitudes in (3+1)d Minkowskian spacetime and that of topological field theory in (1+1)d, together with the constraints which result from the properties of these building blocks. The first part of the thesis is concerned with the introduction of an on-shell formalism for massless and massive particles. We identify all possible three-point tensor structures compatible with the little group symmetry and overall mass...

Automorphic L-Functions, Geometric Invariants, and Dynamics

Alexandre Perozim de Faveri
We address three different problems in analytic number theory. In the first part, we show that the completed L-function of a modular form has Ω(Tδ) simple zeros with imaginary part in [-T, T], for any δ < 2⁄27. This is the first power bound for forms with non-trivial level in this problem, where previously the best result was Ω(log log log T). Along the way, we also improve the corresponding bound in the case of...

sbmlteam/libsbml: Release 5.19.6

This release solves a number of issues: ## What's Changed * User lowercase name for Windows library by @giordano in https://github.com/sbmlteam/libsbml/pull/225 * Fix typo in docstring of `ASTNode_isLogical` by @giordano in https://github.com/sbmlteam/libsbml/pull/230 * improve thread safety of UnitFormulaFormatter, PowerUnitsCheck by @lkeegan in https://github.com/sbmlteam/libsbml/pull/233 * Fix signature of `SBase_getNumPlugins` in prototype by @giordano in https://github.com/sbmlteam/libsbml/pull/237 * Ensure Translate/OutputSBML work on Octave and Matlab by @fbergmann in https://github.com/sbmlteam/libsbml/pull/175 * - add whitespace by @fbergmann in https://github.com/sbmlteam/libsbml/pull/239 *...

CO2 simulations for \"Remote-sensing derived trends in gross primary production explain increases in the CO2 seasonal cycle amplitude\"

Liyin He
simulated surface CO2 concentrations (unit: ppm) from 2001 to 2018 used in paper "Remote-sensing derived trends in gross primary production explain increases in the CO2 seasonal cycle amplitude" (Article DOI: 10.1029/2021GB007220).

Malaska_Titan_caves_SM1_cryovolcano data table

Michael Malaska
.csv data table with a single entry for Sotra Patera cryovolcanic pit on Titan. fields are entry, type_feature, latitude, longidude, and longitude (E360), number_SAP, and literature reference.

Symmetry and Localized Control of Extended Chaotic Systems

Roman O. Grigoriev
The present study is prompted by the failure of conventional chaos control theory to provide a practically sound algorithm for controlling the chaos in general spatially extended experimental systems. The primary reason for this failure is the presence of symmetry, which is a feature of most extended dynamical systems and which violates a number of assumptions of genericity made by conventional control theory. These assumptions can be relaxed, but at a price that increases with...

caltechlibrary/dataset: Code reorganization

My "sub module" approach to developing dataset is getting too painful. I've moved texts and cli back into the main package.

The iNaturalist Localization 500 (iNatLoc500) Dataset

Elijah Cole, Kimberly Wilber, Grant Van Horn, Xuan Yang, Marco Fornoni, Pietro Perona, Serge Belongie, Andrew Howard & Oisin Mac Aodha
The iNaturalist Localization 500 (iNatLoc500) dataset. See the GitHub page (https://github.com/visipedia/inat_loc) for details.

caltechlibrary/dataset: Code reorganization

This is part of the v2.0.0 code reorganization backing off of the sub-package approach, folding everything back into the dataset root package to ease bug fixes.

Leaping Liquid Crystal Elastomers

Kevin Korner
Repository of code for leaping liquid crystal elastomers

BEDMAP2 - Ice thickness, bed and surface elevation for Antarctica - gridding products

Peter Fretwell, Hamish Pritchard, David Vaughan, Jonathan Bamber, N. Barrand, R.E. Bell, C Bianchi, Robert Bingham, Donald Blankenship, G. Casassa, Ginny Catania, D. Callens, H Conway, Alison Cook, Hugh Corr, D Damaske, V. Damn, Fausto Ferraccioli, Rene Forsberg, S. Fujita, Y. Gim, P. Gogineni, J. Griggs, Richard Hindmarsh, P. Holmlund … & A. Zirizzotti
We present here Bedmap2 (2013), a suite of gridded products describing surface elevation, ice-thickness and the sea floor and subglacial bed elevation of the Antarctic south of 60deg S. We derived these products using data from a variety of sources, including many substantial surveys completed since the original Bedmap compilation (Bedmap1) in 2001. In particular, the Bedmap2 ice thickness grid is made from 25 million measurements, over two orders of magnitude more than were used...

Bioorthogonal Noncanonical Amino Acid Tagging for Understanding Bacterial Persistence

Xinyan Liu
Phenotypic heterogeneity in populations of isogenic bacterial cells includes variations in metabolic rates and responses to antibiotic treatment. In particular, sub-populations of “persister” cells exhibit increased antibiotic tolerance. Understanding the mechanisms that underlie bacterial persistence would constitute an important step toward preventing and treating chronic infections. On the other hand, bacteria often have multiple molecular mechanisms to adapt to fluctuating environments. Understanding these mechanisms, and their redundancy, requires examinations in depth at the molecular level....

DSA-110 Data for Candidate Fast Radio Burst 221025aanu

Casey Law
Data associated with DSA-110 candidate transient. Zipped file contains (1) a filterbank file with burst dynamic spectrum and (2) a FITS file with localization region. Second file is a png image showing summary views of data used to identify the candidate.

The Role of Water in the Magmatic and Tectonic Evolution of Metamorphic Core Complexes: A stable Isotope Study of the Southern Omineca Crystalline Belt, British Columbia, Canada

Gregory James Holk
The oxygen isotope data in this study delineate 2 major episodes of water-rock interaction related to the metamorphic, plutonic, and tectonic development of the metamorphic core complexes in the southern Omineca belt. Episode 1 is a Paleocene pre­-extensional metamorphic/magmatic-hydrothermal event. The occurrence of isotopically uniform quartz (δ¹⁸O = 12.5 ± 0.5‰) and feldspar (10.9 ± 0.7‰) throughout different rock types indicates that much of a 6-km-thick section of the mid-crustal Selkirk allochthon underwent internally buffered...

The Materials Provenance Store

Michael Statt, Brian Rohr, Dan Guevarra, Santosh Suram, Thomas Morrell & John Gregoire
A PostgreSQL dump of the Materials Provenance Store (MPS), a database containing metadata and experimental provenance from synthesis to measurement of primarily metal oxide solid state materials resulting from high throughput experimentation.

Registration Year

  • 2022
    460

Resource Types

  • Text
    231
  • Dataset
    157
  • Software
    61
  • Audiovisual
    8
  • Collection
    2
  • Interactive Resource
    1

Affiliations

  • California Institute of Technology
    420
  • California Institute of Technology, Pasadena, CA (US)
    26
  • 25
  • Jet Propulsion Lab
    12
  • Jet Propulsion Laboratory, Pasadena, CA (US)
    6
  • Harvard University, Cambridge, MA (US)
    6
  • Caltech
    6
  • Earth and Space Sciences, University of Washington
    5
  • Institute for Geophysics, Jackson School of Geosciences, University of Texas
    5
  • Istituto Nazionale di Geofisica e Vulcanologia
    5