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Academic Program Recommendations For Graduate Degrees In Medical Physics: Aapm Report No. 365 (Revision Of Report No. 197), Jay W. Burmeister, Nathan C. Busse, Ashley J. Cetnar, Rebecca R. Howell, Robert Jeraj, A. Kyle Jones, Steven H. King, Kenneth L. Matthews, Victor J. Montemayor, Wayne Newhauser, Anna E. Rodrigues, Ehsan Samei, Timothy V. Turkington, Mary P. Gronberg, Brian Loughery, Alison R. Roth, Michael C. Joiner, Edward F. Jackson, Paul A. Naine, Leonard H. Kim Oct 2022

Academic Program Recommendations For Graduate Degrees In Medical Physics: Aapm Report No. 365 (Revision Of Report No. 197), Jay W. Burmeister, Nathan C. Busse, Ashley J. Cetnar, Rebecca R. Howell, Robert Jeraj, A. Kyle Jones, Steven H. King, Kenneth L. Matthews, Victor J. Montemayor, Wayne Newhauser, Anna E. Rodrigues, Ehsan Samei, Timothy V. Turkington, Mary P. Gronberg, Brian Loughery, Alison R. Roth, Michael C. Joiner, Edward F. Jackson, Paul A. Naine, Leonard H. Kim

Faculty Publications

No abstract provided.

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Kmt-2021-Blg-0171lb And Kmt-2021-Blg-1689lb: Two Microlensing Planets In The Kmtnet High-Cadence Fields With Followup Observations, Hongjing Yang, Weicheng Zang, Andrew Gould, Jennifer C. Yee, Kyu Ha Hwang, Grant Christie, Takahiro Sumi, Jiyuan Zhang, Shude Mao, Michael D. Albrow, Sun Ju Chung, Cheongho Han, Youn Kil Jung, Yoon Hyun Ryu, In Gu Shin, Yossi Shvartzvald, Sang Mok Cha, Dong Jin Kim, Hyoun Woo Kim, Seung Lee Kim, Chung Uk Lee, Dong Joo Lee, Yongseok Lee, Byeong Gon Park, Richard W. Pogge, John Drummond, Dan Maoz, Jennie Mccormick, Tim Natusch, Matthew T. Penny, Wei Zhu, Ian A. Bond, Fumio Abe Oct 2022

Kmt-2021-Blg-0171lb And Kmt-2021-Blg-1689lb: Two Microlensing Planets In The Kmtnet High-Cadence Fields With Followup Observations, Hongjing Yang, Weicheng Zang, Andrew Gould, Jennifer C. Yee, Kyu Ha Hwang, Grant Christie, Takahiro Sumi, Jiyuan Zhang, Shude Mao, Michael D. Albrow, Sun Ju Chung, Cheongho Han, Youn Kil Jung, Yoon Hyun Ryu, In Gu Shin, Yossi Shvartzvald, Sang Mok Cha, Dong Jin Kim, Hyoun Woo Kim, Seung Lee Kim, Chung Uk Lee, Dong Joo Lee, Yongseok Lee, Byeong Gon Park, Richard W. Pogge, John Drummond, Dan Maoz, Jennie Mccormick, Tim Natusch, Matthew T. Penny, Wei Zhu, Ian A. Bond, Fumio Abe

Faculty Publications

Follow-up observations of high-magnification gravitational microlensing events can fully exploit their intrinsic sensitivity to detect extrasolar planets, especially those with small mass ratios. To make followup observations more uniform and efficient, we develop a system, HighMagFinder, to automatically alert possible ongoing high-magnification events based on the real-time data from the Korea Microlensing Telescope Network (KMTNet). We started a new phase of follow-up observations with the help of HighMagFinder in 2021. Here we report the discovery of two planets in high-magnification microlensing events, KMT-2021-BLG-0171 and KMT-2021-BLG-1689, which were identified by the HighMagFinder. We find that both events suffer the 'central-resonant' caustic …

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A Covariant Polymerized Scalar Field In Semi-Classical Loop Quantum Gravity, Rodolfo Gambini, Florencia Benítez, Jorge Pullin Oct 2022

A Covariant Polymerized Scalar Field In Semi-Classical Loop Quantum Gravity, Rodolfo Gambini, Florencia Benítez, Jorge Pullin

Faculty Publications

We propose a new polymerization scheme for scalar fields coupled to gravity. It has the advantage of being a (non-bijective) canonical transformation of the fields, and therefore ensures the covariance of the theory. We study it in detail in spherically symmetric situations and compare to other approaches.

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Parametrized Topological Complexity Of Collision-Free Motion Planning In The Plane, Daniel C. Cohen, Michael Farber, Shmuel Weinberger Oct 2022

Parametrized Topological Complexity Of Collision-Free Motion Planning In The Plane, Daniel C. Cohen, Michael Farber, Shmuel Weinberger

Faculty Publications

Parametrized motion planning algorithms have high degrees of universality and flexibility, as they are designed to work under a variety of external conditions, which are viewed as parameters and form part of the input of the underlying motion planning problem. In this paper, we analyze the parametrized motion planning problem for the motion of many distinct points in the plane, moving without collision and avoiding multiple distinct obstacles with a priori unknown positions. This complements our prior work Cohen et al. [3] (SIAM J. Appl. Algebra Geom. 5, 229–249), where parametrized motion planning algorithms were introduced, and the obstacle-avoiding collision-free …

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Enviromic Prediction Is Useful To Define The Limits Of Climate Adaptation: A Case Study Of Common Bean In Brazil, Alexandre Bryan Heinemann, Germano Costa-Neto, Roberto Fritsche-Neto, David Henriques Da Matta, Igor Kuivjogi Fernandes Oct 2022

Enviromic Prediction Is Useful To Define The Limits Of Climate Adaptation: A Case Study Of Common Bean In Brazil, Alexandre Bryan Heinemann, Germano Costa-Neto, Roberto Fritsche-Neto, David Henriques Da Matta, Igor Kuivjogi Fernandes

Faculty Publications

Ongoing changes in the global environmental conditions foster plant breeding research to develop climate-smart cultivars as fast as possible. Data analytics are essential for achieving this goal, especially the so-called science of enviromics (large-scale environmental characterization of crop growing conditions) that could be used to pinpoint the relevant environment impacts driving the adaptation of a certain specie in a breeding framework. Here we quantified the effects of diverse climate factors on the current adaptation of elite common bean germplasm in Brazil. To capture the non-linearity of those impacts across a wide range of environments, we developed an “enviromic prediction” approach …

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Quantization Of The Boolean Poisson Central Limit Theorem And A Generalized Boolean Bernoulli Sequence, Yungang Lu Sep 2022

Quantization Of The Boolean Poisson Central Limit Theorem And A Generalized Boolean Bernoulli Sequence, Yungang Lu

Journal of Stochastic Analysis

No abstract provided.

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A First-Passage Problem For Exponential Integrated Diffusion Processes, Mario Lefebvre Sep 2022

A First-Passage Problem For Exponential Integrated Diffusion Processes, Mario Lefebvre

Journal of Stochastic Analysis

No abstract provided.

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Pest Population Dynamics Are Related To A Continental Overwintering Gradient, Douglas Lawton, Anders S. Huseth, George G. Kennedy, Amy C. Morey, William D. Hutchison, Dominic D. Reisig, Seth J. Dorman, De Shae Dillard, Robert C. Venette, Russell L. Groves, John J. Adamczyk, Izailda Barbosa Dos Santos, Tracey Baute, Sebe Brown, Eric Burkness, Ashley Dean, Galen P. Dively, Hélène B. Doughty, Shelby J. Fleischer, Jessica Green, Jeremy K. Greene, Krista Hamilton, Erin Hodgson, Thomas Hunt, David Kerns, Billy Rogers Leonard, Sean Malone, Fred Musser, David Owens, John C. Palumbo, Silvana Paula-Moraes, Julie A. Peterson, Ricardo Ramirez Sep 2022

Pest Population Dynamics Are Related To A Continental Overwintering Gradient, Douglas Lawton, Anders S. Huseth, George G. Kennedy, Amy C. Morey, William D. Hutchison, Dominic D. Reisig, Seth J. Dorman, De Shae Dillard, Robert C. Venette, Russell L. Groves, John J. Adamczyk, Izailda Barbosa Dos Santos, Tracey Baute, Sebe Brown, Eric Burkness, Ashley Dean, Galen P. Dively, Hélène B. Doughty, Shelby J. Fleischer, Jessica Green, Jeremy K. Greene, Krista Hamilton, Erin Hodgson, Thomas Hunt, David Kerns, Billy Rogers Leonard, Sean Malone, Fred Musser, David Owens, John C. Palumbo, Silvana Paula-Moraes, Julie A. Peterson, Ricardo Ramirez

Faculty Publications

Overwintering success is an important determinant of arthropod populations that must be considered as climate change continues to influence the spatiotemporal population dynamics of agricultural pests. Using a long-term monitoring database and biologically relevant overwintering zones, we modeled the annual and seasonal population dynamics of a common pest, Helicoverpa zea (Boddie), based on three overwintering suitability zones throughout North America using four decades of soil temperatures: the southern range (able to persist through winter), transitional zone (uncertain overwintering survivorship), and northern limits (unable to survive winter). Our model indicates H. zea population dynamics are hierarchically structured with continental-level effects that …

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Resonant Plasmonic–Biomolecular Chiral Interactions In The Far-Ultraviolet: Enantiomeric Discrimination Of Sub-10 Nm Amino Acid Films, Tiago Ramos Leite, Lin Zschiedrich, Orhan Kizilkaya, Kevin M. Mcpeak Sep 2022

Resonant Plasmonic–Biomolecular Chiral Interactions In The Far-Ultraviolet: Enantiomeric Discrimination Of Sub-10 Nm Amino Acid Films, Tiago Ramos Leite, Lin Zschiedrich, Orhan Kizilkaya, Kevin M. Mcpeak

Faculty Publications

Resonant plasmonic–molecular chiral interactions are a promising route to enhanced biosensing. However, biomolecular optical activity primarily exists in the far-ultraviolet regime, posing significant challenges for spectral overlap with current nano-optical platforms. We demonstrate experimentally and computationally the enhanced chiral sensing of a resonant plasmonic–biomolecular system operating in the far-UV. We develop a full-wave model of biomolecular films on Al gammadion arrays using experimentally derived chirality parameters. Our calculations show that detectable enhancements in the chiroptical signals from small amounts of biomolecules are possible only when tight spectral overlap exists between the plasmonic and biomolecular chiral responses. We support this conclusion …

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Advances In Research And Applications Of Co2-Based Demand-Controlled Ventilation In Commercial Buildings: A Critical Review Of Control Strategies And Performance Evaluation, Xing Lu, Zhihong Pang, Yangyang Fu, Zheng O'Neill Sep 2022

Advances In Research And Applications Of Co2-Based Demand-Controlled Ventilation In Commercial Buildings: A Critical Review Of Control Strategies And Performance Evaluation, Xing Lu, Zhihong Pang, Yangyang Fu, Zheng O'Neill

Faculty Publications

The carbon dioxide (CO2)-based demand-controlled ventilation (DCV) has attracted prompt attention from the Heating, Ventilation, and Air-Conditioning (HVAC) industry since its very first invention. Thereafter it has gone through several revolutions due to the rapid advancement in control and sensing technologies. Although a great variety of CO2-based DCV control strategies have been developed in the last two decades, there lacks a holistic literature review that systematically analyzes and summarizes advances and applications of CO2-based DCV in commercial buildings. This paper examines the recent advances in the CO2-based DCV in commercial buildings and focuses on discussing the control-related issues in the …

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Susceptibility Of Different Life Stages Of Kudzu Bug Megacopta Cribraria (F.) (Hemiptera: Plataspidae) To Two Different Native Strains Of Beauveria Bassiana, James Paul Glover, Maribel Portilla, Katherine Parys, Clint Allen, Justin George, Gadi V.P. Reddy Sep 2022

Susceptibility Of Different Life Stages Of Kudzu Bug Megacopta Cribraria (F.) (Hemiptera: Plataspidae) To Two Different Native Strains Of Beauveria Bassiana, James Paul Glover, Maribel Portilla, Katherine Parys, Clint Allen, Justin George, Gadi V.P. Reddy

Faculty Publications

This is the first study that examined and compared the survival, LC50, and RR50 estimates of Megacopta cribraria F. (Hemiptera: Plataspidae) nymphs and adults that were exposed to two native Beauveria bassiana isolates (Previously codified as NI8 and KUDSC strains) at four concentrations. The greatest reduction in survival and mortality was observed primarily on or after 10 d post-exposure to B. bassiana isolates. Survival of early instars (2nd, 3rd) were not affected by either strains or concentration at 3 d and 5 d post-exposure. Survival of later instars (5th) and adults was significantly reduced when exposed to the KUDSC strain …

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Bloch Waves In High Contrast Electromagnetic Crystals, Robert Lipton, Robert Viator, Silvia Jiménez Bolanõs, Abiti Adili Sep 2022

Bloch Waves In High Contrast Electromagnetic Crystals, Robert Lipton, Robert Viator, Silvia Jiménez Bolanõs, Abiti Adili

Faculty Publications

Analytic representation formulas and power series are developed describing the band structure inside non-magnetic periodic photonic three-dimensional crystals made from high dielectric contrast inclusions. Central to this approach is the identification and utilization of a resonance spectrum for quasiperiodic source-free modes. These modes are used to represent solution operators associated with electromagnetic and acoustic waves inside periodic high contrast media. A convergent power series for the Bloch wave spectrum is recovered from the representation formulas. Explicit conditions on the contrast are found that provide lower bounds on the convergence radius. These conditions are sufficient for the separation of spectral branches …

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Does Inflation Squeeze Cosmological Perturbations?, Ivan Agullo, Béatrice Bonga, Patricia Ribes Metidieri Sep 2022

Does Inflation Squeeze Cosmological Perturbations?, Ivan Agullo, Béatrice Bonga, Patricia Ribes Metidieri

Faculty Publications

There seems to exist agreement about the fact that inflation squeezes the quantum state of cosmological perturbations and entangles modes with wavenumbers k⟶ and -k⟶. Paradoxically, this result has been used to justify both the classicality as well as the quantumness of the primordial perturbations at the end of inflation. We reexamine this question and point out that the definition of two-mode squeezing of the modes k⟶ and -k⟶ used in previous work rests on choices that are only justified for systems with time-independent Hamiltonians and finitely many degrees of freedom. We argue that for quantum fields propagating on generic …

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Higher-Rank Radon Transforms On Constant Curvature Spaces, B. Rubin Sep 2022

Higher-Rank Radon Transforms On Constant Curvature Spaces, B. Rubin

Faculty Publications

We study higher-rank Radon transforms of the form f(τ) → ∫ τ⊂ζf(τ) , where τ is a j-dimensional totally geodesic submanifold in the n-dimensional real constant curvature space and ζ is a similar submanifold of dimension k> j. The corresponding dual transforms are also considered. The transforms are explored in the Euclidean case (affine Grassmannian bundles), the elliptic case (compact Grassmannians), and the hyperbolic case (the hyperboloid model, the Beltrami-Klein model, and the projective model). The main objectives are sharp conditions for the existence and injectivity of the Radon transforms in Lebesgue spaces, transition from one model to another, support …

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Right-Angled Artin Subgroups Of Artin Groups, Kasia Jankiewicz, Kevin Schreve Sep 2022

Right-Angled Artin Subgroups Of Artin Groups, Kasia Jankiewicz, Kevin Schreve

Faculty Publications

The Tits Conjecture, proved by Crisp and Paris, states that squares of the standard generators of any Artin group generate an obvious right-angled Artin subgroup. We consider a larger set of elements consisting of all the centers of the irreducible spherical special subgroups of the Artin group, and conjecture that sufficiently large powers of those elements generate an obvious right-angled Artin subgroup. This alleged right-angled Artin subgroup is in some sense as large as possible; its nerve is homeomorphic to the nerve of the ambient Artin group. We verify this conjecture for the class of locally reducible Artin groups, which …

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Cenozoic Antarctic Peninsula Temperatures And Glacial Erosion Signals From A Multi-Proxy Biomarker Study, Emily J. Tibbett, Sophie Warny, Jessica E. Tierney, Julia S. Wellner, Sarah J. Feakins Sep 2022

Cenozoic Antarctic Peninsula Temperatures And Glacial Erosion Signals From A Multi-Proxy Biomarker Study, Emily J. Tibbett, Sophie Warny, Jessica E. Tierney, Julia S. Wellner, Sarah J. Feakins

Faculty Publications

Terrestrial climate records for Antarctica, beyond the age limit of ice cores, are restricted to the few unglaciated areas with exposed rock outcrops. Marine sediments on Antarctica's continental shelves contain records of past oceanic and terrestrial environments that can provide important insights into Antarctic climate evolution. The SHALDRIL II (Shallow Drilling on the Antarctic Continental Margin) expedition recovered sedimentary sequences from the eastern side of the Antarctic Peninsula of late Eocene, Oligocene, middle Miocene, and early Pliocene age that provides insights into Cenozoic Antarctic climate and ice sheet development. Here, we use biomarker data to assess atmospheric and oceanic temperatures …

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Applications Of Temperature Transient Analysis For Reservoir Surveillance, Refaat Galal Aboelfotoh Hashish Sep 2022

Applications Of Temperature Transient Analysis For Reservoir Surveillance, Refaat Galal Aboelfotoh Hashish

LSU Doctoral Dissertations

Reservoir monitoring is a key factor in the management of oil and gas resources. With the recent developments of permanent downhole temperature monitoring tools such as Fiber-Optic Distributed Temperature Sensing (FO-DTS), temperature transient analysis has evolved as a new alternative for reservoir monitoring. In this work, different techniques of temperature data analysis are presented for monitoring and characterization of hydrocarbon and geologic carbon storage (GCS) reservoirs. The objective of this study is to present new approaches that enable monitoring injection profile through vertical and horizontal injection wells using temperature warmback analysis. Application of temperature warmback analysis is also extended for …

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Dynamic Modeling Of Aba-Dependent Expression Of The Arabidopsis Rd29a Gene, Ruth Ndathe, Renee Dale, Naohiro Kato Aug 2022

Dynamic Modeling Of Aba-Dependent Expression Of The Arabidopsis Rd29a Gene, Ruth Ndathe, Renee Dale, Naohiro Kato

Faculty Publications

The abscisic acid (ABA) signaling pathway is the key defense mechanism against drought stress in plants. In the pathway, signal transduction among four core proteins, pyrabactin resistance (PYR), protein phosphatase 2C (PP2C), sucrose-non-fermenting-1-related protein kinase 2 (SnRK2), and ABRE binding factor (ABF) leads to altered gene expression kinetics that is driven by an ABA-responsive element (ABRE). A most recent and comprehensive study provided data suggesting that ABA alters the expression kinetics in over 6,500 genes through the ABF-ABRE associations in Arabidopsis. Of these genes, termed ABA gene regulatory network (GRN), over 50% contain a single ABRE within 4 kb of …

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Domain Of Exotic Laplacian Constructed By Wiener Integrals Of Exponential White Noise Distributions, Luigi Accardi, Un Cig Ji, Kimiaki Saitô Aug 2022

Domain Of Exotic Laplacian Constructed By Wiener Integrals Of Exponential White Noise Distributions, Luigi Accardi, Un Cig Ji, Kimiaki Saitô

Journal of Stochastic Analysis

No abstract provided.

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Understanding Consumers' Use Experience On Electrically Heated Jacket: A Study On Online Review Using Topic Modeling, Md Nakib-Ul Hasan Aug 2022

Understanding Consumers' Use Experience On Electrically Heated Jacket: A Study On Online Review Using Topic Modeling, Md Nakib-Ul Hasan

LSU Doctoral Dissertations

The demand for heated jackets is anticipated to be fuelled by frequent temperature drops, severe winter weather, and increasing outdoor activities. Electrically heated jackets (EHJ) are primarily marketed through online distribution channels and expansion of online sales channels is expected to boost the global market. Consumers are increasingly relying on online reviews from other consumers to help them decide what to buy. Businesses also actively monitor and manage their online reviews to build trust in their brand and make it more likely that customers will buy. Traditional approaches for assessing customer behavior, such as market research surveys and focus groups, …

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Mercury Biomagnification In A Coastal Louisiana Food Web Following The 2010 Deepwater Horizon Oil Spill, Katelyn J. Lamb, Stephen R. Midway, Rebecka L. Brasso, Paola C. López-Duarte, Matthew E. Kimball, Michael J. Polito Aug 2022

Mercury Biomagnification In A Coastal Louisiana Food Web Following The 2010 Deepwater Horizon Oil Spill, Katelyn J. Lamb, Stephen R. Midway, Rebecka L. Brasso, Paola C. López-Duarte, Matthew E. Kimball, Michael J. Polito

Faculty Publications

The estuarine environments surrounding coastal Louisiana create favorable conditions for microbially mediated mercury (Hg) methylation and subsequent bioaccumulation by biota. In 2010, the Deepwater Horizon (DWH) oil spill released large amounts of oil which, despite having low Hg concentrations, had the potential to influence methylmercury (MeHg) bioavailability in the coastal zone. To explore this possibility, we assessed Hg concentrations and trophodynamics in the coastal Louisiana food web prior to and immediately following the DWH oil spill and compared these metrics with an adjacent coastal ecosystem in the northern Gulf of Mexico. We found no differences in MeHg concentrations between oysters …

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Computational Imaging For Shape Understanding, Yuqi Ding Aug 2022

Computational Imaging For Shape Understanding, Yuqi Ding

LSU Doctoral Dissertations

Geometry is the essential property of real-world scenes. Understanding the shape of the object is critical to many computer vision applications. In this dissertation, we explore using computational imaging approaches to recover the geometry of real-world scenes. Computational imaging is an emerging technique that uses the co-designs of image hardware and computational software to expand the capacity of traditional cameras. To tackle face recognition in the uncontrolled environment, we study 2D color image and 3D shape to deal with body movement and self-occlusion. Especially, we use multiple RGB-D cameras to fuse the varying pose and register the front face in …

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Improved Building-Specific Flood Risk Assessment And Implications Of Depth-Damage Function Selection, Ehab Gnan, Carol J. Friedland, Md Adilur Rahim, Rubayet Bin Mostafiz, Robert V. Rohli, Fatemeh Orooji, Arash Taghinezhad, Jasmin Mcelwee Aug 2022

Improved Building-Specific Flood Risk Assessment And Implications Of Depth-Damage Function Selection, Ehab Gnan, Carol J. Friedland, Md Adilur Rahim, Rubayet Bin Mostafiz, Robert V. Rohli, Fatemeh Orooji, Arash Taghinezhad, Jasmin Mcelwee

Faculty Publications

Average annual loss (AAL) is traditionally used as the basis of assessing flood risk and evaluating risk mitigation measures. This research presents an improved implementation to estimate building-specific AAL, with the flood hazard of a building represented by the Gumbel extreme value distribution. AAL is then calculated by integrating the area under the overall loss-exceedance probability curve using trapezoidal Riemann sums. This implementation is compared with existing AAL estimations from flood risk assessment. A sensitivity analysis is conducted to examine the variability in AAL results based on depth-damage function (DDF) choice. To demonstrate the methodology, a one-story single-family residence is …

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Covid-19 In The United States As Affective Frame, John Protevi Aug 2022

Covid-19 In The United States As Affective Frame, John Protevi

Faculty Publications

In this paper I attempt to contribute to the developing field of “political philosophy of mind.” To render concrete the notion of “affective frame,” a social situation which pre-selects for salience and valence of environmental factors relative to a subject’s life, I conduct a case study of a deleterious socially instituted affective frame, which, during the early days of the COVID19 pandemic in the United States, produced individuated circumstances that came crashing down on “essential workers” who were forced into a double bind. We saw here an untenable and ultimately fatal situation that forced a choice between, on the one …

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Insight In Thermomechanical Constitutive Modeling Of Shape Memory Polymers, Amir Shojaei, Wei Xu, Cheng Yan, Qianxi Yang, Guoqiang Li Aug 2022

Insight In Thermomechanical Constitutive Modeling Of Shape Memory Polymers, Amir Shojaei, Wei Xu, Cheng Yan, Qianxi Yang, Guoqiang Li

Faculty Publications

Shape memory polymers (SMPs) are a new member of the smart materials family. SMPs have found wide applications or potential applications in almost all manmade structures and devices. In order to better design smart structures and devices using SMPs, thermomechanical constitutive modeling is essential. In this insight paper, we will focus on presenting several multi-length-scale and multi-physics modeling frameworks, including the thermodynamics consistent model, elasto-viscoplastic model, statistical mechanics model, and phase evaluation law model. The SMPs modeled will include amorphous one-way shape memory polymers, semicrystalline one-way shape memory polymers, semicrystalline two-way shape memory polymers, and functional and mechanical damage effects …

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A New Ocean State After Nuclear War, Cheryl S. Harrison, Tyler Rohr, Alice Duvivier, Elizabeth A. Maroon, Scott Bachman, Charles G. Bardeen, Joshua Coupe, Victoria Garza, Ryan Heneghan, Nicole S. Lovenduski, Philipp Neubauer, Victor Rangel, Alan Robock, Kim Scherrer, Samantha Stevenson, Owen B. Toon Aug 2022

A New Ocean State After Nuclear War, Cheryl S. Harrison, Tyler Rohr, Alice Duvivier, Elizabeth A. Maroon, Scott Bachman, Charles G. Bardeen, Joshua Coupe, Victoria Garza, Ryan Heneghan, Nicole S. Lovenduski, Philipp Neubauer, Victor Rangel, Alan Robock, Kim Scherrer, Samantha Stevenson, Owen B. Toon

Faculty Publications

Nuclear war would produce dire global consequences for humans and our environment. We simulated climate impacts of US-Russia and India-Pakistan nuclear wars in an Earth System Model, here, we report on the ocean impacts. Like volcanic eruptions and large forest fires, firestorms from nuclear war would transport light-blocking aerosols to the stratosphere, resulting in global cooling. The ocean responds over two timescales: a rapid cooling event and a long recovery, indicating a hysteresis response of the ocean to global cooling. Surface cooling drives sea ice expansion, enhanced meridional overturning, and intensified ocean vertical mixing that is expanded, deeper, and longer …

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Global Food Insecurity And Famine From Reduced Crop, Marine Fishery And Livestock Production Due To Climate Disruption From Nuclear War Soot Injection, Lili Xia, Alan Robock, Kim Scherrer, Cheryl S. Harrison, Benjamin Leon Bodirsky, Isabelle Weindl, Jonas Jägermeyr, Charles G. Bardeen, Owen B. Toon, Ryan Heneghan Aug 2022

Global Food Insecurity And Famine From Reduced Crop, Marine Fishery And Livestock Production Due To Climate Disruption From Nuclear War Soot Injection, Lili Xia, Alan Robock, Kim Scherrer, Cheryl S. Harrison, Benjamin Leon Bodirsky, Isabelle Weindl, Jonas Jägermeyr, Charles G. Bardeen, Owen B. Toon, Ryan Heneghan

Faculty Publications

Atmospheric soot loadings from nuclear weapon detonation would cause disruptions to the Earth’s climate, limiting terrestrial and aquatic food production. Here, we use climate, crop and fishery models to estimate the impacts arising from six scenarios of stratospheric soot injection, predicting the total food calories available in each nation post-war after stored food is consumed. In quantifying impacts away from target areas, we demonstrate that soot injections larger than 5 Tg would lead to mass food shortages, and livestock and aquatic food production would be unable to compensate for reduced crop output, in almost all countries. Adaptation measures such as …

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Density Of States And Delocalization For Discrete Magnetic Random Schrödinger Operators, Simon Becker, Rui Han Aug 2022

Density Of States And Delocalization For Discrete Magnetic Random Schrödinger Operators, Simon Becker, Rui Han

Faculty Publications

We study discrete magnetic random Schrödinger operators on the square and honeycomb lattice. For the non-random magnetic operator on the hexagonal lattice with any rational magnetic flux, we show that the middle two dispersion surfaces exhibit Dirac cones. We then derive an asymptotic expansion for the density of states on the honeycomb lattice for oscillations of arbitrary rational magnetic flux. This allows us, as a corollary, to rigorously study the quantum Hall effect and conclude dynamical delocalization close to the conical point under disorder. We obtain similar results for the discrete random Schrödinger operator on the Z2-lattice with …

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Valley-Floor Snowfall In Taylor Valley, Antarctica, From 1995 To 2017: Spring, Summer And Autumn, Madeline E. Myers, Peter T. Doran, Krista F. Myers Aug 2022

Valley-Floor Snowfall In Taylor Valley, Antarctica, From 1995 To 2017: Spring, Summer And Autumn, Madeline E. Myers, Peter T. Doran, Krista F. Myers

Faculty Publications

We present an analysis of the 20 year snowfall dataset in Taylor Valley and the results of a new snow cover monitoring study. Snowfall has been measured at four sites in Taylor Valley from 1995 to 2017. We focus on valley-floor snowfall when wind does not exceed 5 m s-1, and we exclude winter from our analysis due to poor data quality. Snowfall averaged 11 mm water equivalent (w.e.) from 1995 to 2017 across all stations and ranged from 1 to 58 mm w.e. Standard deviations ranged from 3 to 17 mm w.e., highlighting the strong interannual variability of snowfall …

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Systematic Kmtnet Planetary Anomaly Search: V. Complete Sample Of 2018 Prime-Field, Andrew Gould, Cheongho Han, Weicheng Zang, Hongjing Yang, Kyu Ha Hwang, Andrzej Udalski, Ian A. Bond, Michael D. Albrow, Sun Ju Chung, Youn Kil Jung, Yoon Hyun Ryu, In Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Sang Mok Cha, Dong Jin Kim, Hyoun Woo Kim, Seung Lee Kim, Chung Uk Lee, Dong Joo Lee, Yongseok Lee, Byeong Gon Park, Richard W. Pogge, Przemek Mróz, Michal K. Szymanski, Jan Skowron, Radek Poleski, Igor Soszynski, Pawel Pietrukowicz, Szymon Kozlowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek Aug 2022

Systematic Kmtnet Planetary Anomaly Search: V. Complete Sample Of 2018 Prime-Field, Andrew Gould, Cheongho Han, Weicheng Zang, Hongjing Yang, Kyu Ha Hwang, Andrzej Udalski, Ian A. Bond, Michael D. Albrow, Sun Ju Chung, Youn Kil Jung, Yoon Hyun Ryu, In Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Sang Mok Cha, Dong Jin Kim, Hyoun Woo Kim, Seung Lee Kim, Chung Uk Lee, Dong Joo Lee, Yongseok Lee, Byeong Gon Park, Richard W. Pogge, Przemek Mróz, Michal K. Szymanski, Jan Skowron, Radek Poleski, Igor Soszynski, Pawel Pietrukowicz, Szymon Kozlowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek

Faculty Publications

We complete the analysis of all 2018 prime-field microlensing planets identified by the Korea Microlensing Telescope Network (KMTNet) Anomaly Finder. Among the ten previously unpublished events with clear planetary solutions, eight are either unambiguously planetary or are very likely to be planetary in nature: OGLE-2018-BLG-1126, KMT-2018-BLG-2004, OGLE-2018-BLG-1647, OGLE-2018-BLG-1367, OGLE-2018-BLG-1544, OGLE-2018-BLG-0932, OGLE-2018-BLG-1212, and KMT-2018-BLG-2718. Combined with the four previously published new Anomaly Finder events and 12 previously published (or in preparation) planets that were discovered by eye, this makes a total of 24 2018 prime-field planets discovered or recovered by Anomaly Finder. Together with a paper in preparation on 2018 subprime …

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