Geologic Factors Controlling Patterns Of Small‐Volume Basaltic Volcanism: Application To A Volcanic Hazards Assessment At Yucca Mountain, Nevada, Charles B. Connor, John A. Stamatakos, David A. Ferrill, Brittain E. Hill, Goodluck I. Ofoegbu, Michael Conway, Budhi Sagar, John Trapp
The proposed high‐level radioactive waste repository at Yucca Mountain, Nevada, is located within an active volcanic field. Probabilistic volcanic hazard models for future eruptions through the proposed repository depend heavily on our understanding of the spatial controls on volcano distribution at a variety of scales. On regional scales, Pliocene‐Quaternary volcano clusters are located east of the Bare Mountain fault. Extension has resulted in large‐scale crustal density contrast across the fault, and vents are restricted to low‐density areas of the hanging wall. Finite element modeling indicates that this crustal density contrast can result in transient pressure changes ...
Evidence Of Regional Structural Controls On Vent Distribution: Springerville Volcanic Field, Arizona, 2019 Florida International University
Evidence Of Regional Structural Controls On Vent Distribution: Springerville Volcanic Field, Arizona, Charles B. Connor, Christopher Condit, Larry S. Crumpler, Jayne C. Aubele
Quantitative analysis of the geographic distribution of vents and comparison with regional structural, petrologic, and vent age data provide insight into the processes governing the emplacement of vents in the Springerville volcanic field, Arizona. A total of 409 vents in the Springerville volcanic field (SVF) have a mean distance to nearest neighbor vents of 955 m, a much closer spacing than is common in some platform‐type volcanic fields. Based upon a cluster analysis search radius parameter of 4500 m, these vents comprise seven geographic clusters, with only five outlying vents occurring in the entire field. Cinder cone clusters in ...
Estimating The Frequency Of Volcanic Ash Clouds Over Northern Europe, 2019 University of Leeds
Estimating The Frequency Of Volcanic Ash Clouds Over Northern Europe, Elizabeth J. Watson, Graeme T. Swindles, Ivan P. Savov, Ian T. Lawson, Charles B. Connor, J. A. Wilson
Fine ash produced during explosive volcanic eruptions can be dispersed over a vast area, where it poses a threat to aviation, human health and infrastructure. Here, we focus on northern Europe, which lies in the principal transport direction for volcanic ash from Iceland, one of the most active volcanic regions in the world. We interrogate existing and newly produced geological and written records of past ash fallout over northern Europe in the last 1000 years and estimate the mean return (repose) interval of a volcanic ash cloud over the region to be 44±7 years. We compare tephra records from ...
Continuous Monitoring Of High‐Temperature Fumaroles On An Active Lava Dome, Volcán Colima, Mexico: Evidence Of Mass Flow Variation In Response To Atmospheric Forcing, 2019 Florida International University
Continuous Monitoring Of High‐Temperature Fumaroles On An Active Lava Dome, Volcán Colima, Mexico: Evidence Of Mass Flow Variation In Response To Atmospheric Forcing, Charles B. Connor, Bradford M. Clement, Xiaodan Song, Sammantha B. Lane, Jennifer West-Thomas
Rapid, multichannel monitoring of fumaroles on Volcán Colima, Mexico, provides new insight into the time‐scales and magnitudes of fumarole temperature variation. Temperatures in five fumaroles, all located along a single fracture cutting the summit lava dome of the volcano, were monitored at 20‐min intervals between May 1991 and May 1992. Measurements were made using a programmable data logger deployed near the fumarole field, and data were radiotelemetered to a nearby volcano observatory at regular intervals. Mean fumarole temperatures varied between 350°C and 550°C. Statistical analysis of these time series shows that significant diurnal variation occurs in ...
Efficient Inversion And Uncertainty Quantification Of A Tephra Fallout Model, 2019 University of South Florida
Efficient Inversion And Uncertainty Quantification Of A Tephra Fallout Model, T. J. White, Charles B. Connor, Laura J. Connor, T. Hasenaka
An efficient and effective inversion and uncertainty quantification approach is proposed for estimating eruption parameters given a data set collected from a tephra deposit. The approach is model independent and here is applied using Tephra2, a code that simulates advective and dispersive tephra transport and deposition. The Levenburg‐Marquardt algorithm is combined with formal Tikhonov and subspace regularization to invert eruption parameters; a linear equation for conditional uncertainty propagation is used to estimate posterior parameter uncertainty. Both the inversion and uncertainty analysis support simultaneous analysis of the full eruption and wind field parameterization. The combined inversion/uncertainty quantification approach is ...
Climatic Control On Icelandic Volcanic Activity During The Mid-Holocene, 2019 University of Leeds
Climatic Control On Icelandic Volcanic Activity During The Mid-Holocene, Graeme T. Swindles, Elizabeth J. Watson, Ivan P. Savov, Ian T. Lawson, Anja Schmidt, Andrew Hooper, Claire L. Cooper, Charles B. Connor, Manuel Gloor, Jonathan L. Carrivick
Human-induced climate change is causing rapid melting of ice in many volcanically active regions. Over glacial-interglacial time scales changes in surface loading exerted by large variations in glacier size affect the rates of volcanic activity. Numerical models suggest that smaller changes in ice volume over shorter time scales may also influence rates of mantle melt generation. However, this effect has not been verified in the geological record. Furthermore, the time lag between climatic forcing and a resultant change in the frequency of volcanic eruptions is unknown. We present empirical evidence that the frequency of volcanic eruptions in Iceland was affected ...
A Geophysical Model For The Origin Of Volcano Vent Clusters In A Colorado Plateau Volcanic Field, 2019 University of South Florida
A Geophysical Model For The Origin Of Volcano Vent Clusters In A Colorado Plateau Volcanic Field, Fanghui Deng, Charles B. Connor, Rocco Malservisi, Laura J. Connor, Jeremy White, Aurélie Germa, Paul H. Wetmore
Variation in spatial density of Quaternary volcanic vents, and the occurrence of vent clusters, correlates with boundaries in Proterozoic crust in the Springerville volcanic field (SVF), Arizona, USA. Inverse modeling using 538 gravity measurements shows that vent clusters correlate with gradients in the gravity field due to lateral variation in crustal density. These lateral discontinuities in the crustal density can be explained by boundaries in the North American crust formed during Proterozoic accretion. Spatial density of volcanic vents is low in regions of high‐density Proterozoic crust, high in areas of relatively low density Proterozoic crust, and is greatest adjacent ...
A Quantitative Literacy View Of Natural Disasters And Nuclear Facilities, 2019 University of South Florida
A Quantitative Literacy View Of Natural Disasters And Nuclear Facilities, C. B. Connor
The March 11, 2011 earthquake, tsunami, and nuclear disaster in Tohoku, Japan, highlights the need to improve quantitative literacy (QL) in natural hazard assessment. A critical understanding of natural hazard assessments requires a sophisticated perspective on the mathematical and statistical tools used to estimate the odds of disaster, and the roles of data quality, model development, and subjective probability in estimation of uncertainty. Thus, improved QL is a basic requirement for improved decision-making about the safety of critical infrastructure, such as nuclear facilities.
A New Approach To Probabilistic Lava Flow Hazard Assessments, Applied To The Idaho National Laboratory, Eastern Snake River Plain, Idaho, Usa, Elisabeth Gallant, Jacob Richardson, Charles Connor, Paul Wetmore, Laura Connor
We present a new probabilistic lava flow hazard assessment for the U.S. Department of Energy’s Idaho National Laboratory (INL) nuclear facility that (1) explores the way eruptions are defined and modeled, (2) stochastically samples lava flow parameters from observed values for use in MOLASSES, a lava flow simulator, (3) calculates the likelihood of a new vent opening within the boundaries of INL, (4) determines probabilities of lava flow inundation for INL through Monte Carlo simulation, and (5) couples inundation probabilities with recurrence rates to determine the annual likelihood of lava flow inundation for INL. Results show a 30 ...
Voltage Controlled Magnetism In Cr2o3 Based All-Thin-Film Systems, 2019 University of Nebraska - Lincoln
Voltage Controlled Magnetism In Cr2o3 Based All-Thin-Film Systems, Junlei Wang, Will Echtenkamp, Ather Mahmood, Christian Binek
Christian Binek Publications
Voltage-control of exchange biases through active selection of distinct domain states of the magnetoelectric and antiferromagnetic pinning layer is demonstrated for Cr2O3/CoPd heterostructures. Progress and obstacles towards an isothermal switching of exchange bias are discussed. An alternative approach avoiding exchange bias for voltage-controlled memory exploits boundary magnetization at the surface of Cr2O3 as voltage-controlled state variable. We demonstrate readout and switching of boundary magnetization in ultra-thin Cr2O3/Pt Hall bar devices where reversal of boundary magnetization is achieved via magnetoelectric annealing with simultaneously applied ±0.5 V and 400 mT electric and magnetic fields.
The Investigation Of Methylidyne Radical (Ch) Reactions With Furan, 2-Methylfuran, And 2,5-Dimethlyfuran And The Photoionization And Photodissociation Of Valeric Acid, 2019 The University of San Francisco
The Investigation Of Methylidyne Radical (Ch) Reactions With Furan, 2-Methylfuran, And 2,5-Dimethlyfuran And The Photoionization And Photodissociation Of Valeric Acid, Erica Carrasco
This thesis presents the combustion study of three furanic compounds using synchrotron radiation coupled with multiplexed photoionization mass spectrometry at 298 K. The experiments were performed at the Chemical Dynamics Beamline 9.0.2 at the Advanced Light Source of the Lawrence Berkeley National Laboratory. The reactions of the three furanic compounds with methylidyne (CH) radicals were analyzed based on their photoionization spectra and kinetic profiles.
Additionally, the unimolecular dissociation of valeric acid was also studied and presented in this work using the double imaging photoelectron photoion spectrometry (i2PEPICO) coupled with synchrotron radiation from the VUV beamline. The experiments were ...
Organic Chemistry I Drill (Chem2210d) - Module 2 - Sample Problems, 2019 Xavier University of Louisiana
Organic Chemistry I Drill (Chem2210d) - Module 2 - Sample Problems, Candace M. Lawrence
Sample Problems for Module 2
Organic Chemistry I Drill (Chem2210d) - Module 2 - Functional Groups And Infrared Spectroscopy, 2019 Xavier University of Louisiana
Organic Chemistry I Drill (Chem2210d) - Module 2 - Functional Groups And Infrared Spectroscopy, Candace M. Lawrence
This module teaches the student to draw Lewis structures, identify bond types present in molecules from IR spectroscopic data and predict features of IR spectrum of molecules
Organic Chemistry I Drill (Chem2210d)-Module 2- Sample B-Answer Key, 2019 Xavier University of Louisiana
Organic Chemistry I Drill (Chem2210d)-Module 2- Sample B-Answer Key, Candace M. Lawrence
Answer Key to Sample Problems
Genetic Sequencing For Measuring Biodiversity In Recent And Ancient Marine Sediments, 2019 Augustana College, Rock Island Illinois
Genetic Sequencing For Measuring Biodiversity In Recent And Ancient Marine Sediments, Lauren Judge
Celebration of Learning
Taxonomic biodiversity, measured by counting the number of species present in a given area, is the most common method of capturing ecosystem biodiversity in recent and ancient environments. While this method is widely accepted, it is limited by poor preservation and identification of many individuals, making it impossible to include every species within an ecosystem and resulting in the loss of some diversity information. To address this issue, we measured the genetic biodiversity (in which species are determined based on sequencing of their DNA) of shallow marine ecosystems by extracting and sequencing the 18S ribosomal gene from bulk carbonate sediment ...
Geochemical Analysis Of The Chinchín Formation In Southern Ecuador, 2019 Augustana College, Rock Island Illinois
Geochemical Analysis Of The Chinchín Formation In Southern Ecuador, Katherine Ludwig
Celebration of Learning
The subduction of the Nazca Plate under the South American Plate has led to the uplift of the majority of the Andes Mountains, but in Ecuador, the Nazca Plate subducts underneath the North Andes Plate, which then collides with the South American Plate. This tectonic setting has formed two parallel mountain chains as well as a complex series of basins between them. However, the formations that make up these basins are poorly understood. This study focuses on the Chinchín Formation, an ~3.5 km thick, volcanic formation that serves as the bedrock of the Quingeo Basin in southern Ecuador. This ...
Recent Trends In Combinatorics, 2019 Macalester College
Recent Trends In Combinatorics, Andrew Beveridge, Jerrold R. Griggs, Leslie Hogben, Gregg Musiker, Prasad Tetali
Section 1: Extremal and Probabilistic Combinatorics -- Problems Related to Graph Indices in Trees -- The edit distance in graphs: methods, results and generalizations -- Repetitions in graphs and sequences -- On Some Extremal Problems for Cycles in Graphs -- A survey of Turan problems for expansions -- Survey on matching, packing and Hamilton cycle problems on hypergraphs -- Rainbow Hamilton cycles in random graphs and hypergraphs -- Further applications of the Container Method -- Independent transversals and hypergraph matchings - an elementary approach -- Giant components in random graphs -- Infinite random graphs and properties of metrics -- Nordhaus-Gaddum Problems for Colin de Verdière Type Parameters, Variants of Tree-width, and Related Parameters ...
Identifying Classes Susceptible To Adversarial Attacks, 2019 Iowa State University
Identifying Classes Susceptible To Adversarial Attacks, Rangeet Pan, Md Johirul Islam, Shibbir Ahmed, Hridesh Rajan
Computer Science Publications
Despite numerous attempts to defend deep learning based image classifiers, they remain susceptible to the adversarial attacks. This paper proposes a technique to identify susceptible classes, those classes that are more easily subverted. To identify the susceptible classes we use distance-based measures and apply them on a trained model. Based on the distance among original classes, we create mapping among original classes and adversarial classes that helps to reduce the randomness of a model to a significant amount in an adversarial setting. We analyze the high dimensional geometry among the feature classes and identify the k most susceptible target classes ...
Cluster Chondrite Accretion Temperatures Determined With Electron Backscatter Diffraction, 2019 Portland State University
Cluster Chondrite Accretion Temperatures Determined With Electron Backscatter Diffraction, Secana Goudy, Alexander Ruzicka
We studied ordinary chondrites with cluster chondrite lithologies using electron backscatter diffraction to measure the temperatures of their olivine grains during deformation. Samples analyzed with the technique are shock classified as S1 and are type 3, so the deformation analyzed is inferred to represent the temperatures of the chondrules during accretional deformation. It was found that the studied samples are of a mixture of chondrules at mostly hot temperatures (>850°C) and some at cold.
Http://getnutritionshelp.com/Holistic-Bliss-Keto/, 2019 Bryant University