Article
Geography, Physical
Carly Peltier, Michael R. Kaplan, Sean D. Birkel, Rodrigo L. Soteres, Esteban A. Sagredo, Juan Carlos Aravena, Jose Araos, Patricio Moreno, Roseanne Schwartz, Joerg M. Schaefer
Summary: The study identified the timing and structure of the last two major glaciations and the last termination based on well-preserved glacial deposits in southernmost South America. By analyzing Be-10 surface exposure data from Moraine boulders, researchers revealed the stages of glacier stability and retreat during the ice age maximum and advance periods.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Environmental Studies
H. Gregory McDonald
Summary: Late Pleistocene sloths had a wide distribution and inhabited various habitats in South, Central, and North America and some Caribbean Islands. They were classified into 27 genera in four families, but the number of valid species remains uncertain. The paleoecology and natural history of sloths vary greatly depending on their relative abundance, resulting in different sloth faunas with distinct taxonomic compositions in different geographic regions.
Article
Chemistry, Analytical
Jongmin Ahn, Deawon Do, Wanjin Kim
Summary: This paper presents short-range and long-range communication methods for underwater acoustic covert communications using dolphin whistles, and proposes a novel biomimetic communication method that achieves low bit-error rate (BER) and large degree of mimic (DoM). Computer simulations and ocean experiments demonstrate the superior performance of the proposed method.
Article
Environmental Sciences
Gyo-Hwang Choo, Kyunghwa Lee, Jeonghyeon Seo, Seung-Yeon Kim, Dong-Won Lee, Hye-Jung Shin
Summary: This study analyzed high-concentration aerosol events transported to Seoul using satellite and ground-based observations, identifying significant differences in optical and chemical properties between yellow dust, particulate matter traversing over the Yellow Sea, and particulate matter passing through North Korea.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Engineering, Civil
Carlos A. Arteta, Cesar A. Pajaro, Vicente Mercado, Julian Montejo, Monica Arcila, Norman A. Abrahamson
Summary: The study introduces a new empirical ground-motion prediction model for subduction events in northern South America, utilizing an updated ground-motion database curated by the Colombian Geological Survey. Regional terms are estimated with records from 60 subduction events in Colombia and Ecuador, considering different geological factors that may influence ground motions.
EARTHQUAKE SPECTRA
(2021)
Article
Environmental Sciences
Seoyoung Lee, Minseok Kim, Seung-Yeon Kim, Dong-Won Lee, Hanlim Lee, Jhoon Kim, Sophia Le, Yang Liu
Summary: This study used geostationary satellite measurements and modeling to assess the impact of aerosol long-range transport (LRT) on air quality in South Korea. The findings showed that during LRT events, PM2.5 concentrations in Seoul increased by 52% to 81%, with LRT contributing up to 33% of PM2.5 concentrations.
ENVIRONMENTAL POLLUTION
(2021)
Article
Multidisciplinary Sciences
Plinio Jaqueto, Ricardo I. F. Trindade, Filipe Terra-Nova, Joshua M. Feinberg, Valdir F. Novello, Nicolas M. Strikis, Peter Schroedl, Vitor Azevedo, Beck E. Strauss, Francisco W. Cruz, Hai Cheng, R. Lawrence Edwards
Summary: Speleothems can provide continuous and high-quality records of the geomagnetic field. The paleomagnetic records of a mid-to-late Holocene stalagmite from Brazil show small angular variations and relatively steady paleointensity, contrasting with the fast variations observed in younger speleothems from the same region.
NATURE COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Joyce Rodrigues do Prado, L. Lacey Knowles, Alexandre Reis Percequillo
Summary: This study utilized genome-wide SNP and morphometric data to apply a Bayesian model-based species delimitation in the genus Holochilus, leading to significant rearrangements of species boundaries and offering insights into the group's biogeographic history. It highlights the importance of integrative approaches in identifying evolutionary independent species and provides a critical source of data for hypotheses about the history of the biomes in the relatively understudied wetlands of South America.
MOLECULAR PHYLOGENETICS AND EVOLUTION
(2021)
Editorial Material
Biochemistry & Molecular Biology
Stephen J. Gaughran, Bridgett vonHoldt
Summary: The distribution and movement of species, known as biogeography, is a fundamental field in ecology and evolutionary biology. Recent genetic studies of ancient specimens have revealed important evidence on the migrations of brown bears and lions into North America during the late Pleistocene, highlighting the long-lasting impact of sea level changes on the dispersal of terrestrial carnivores.
Article
Mechanics
Matthew F. Lapa, Michael Levin
Summary: We show that certain gapped quantum many-body systems have a stable ground state degeneracy to long-range perturbations, with exponentially small ground state energy splitting induced by such perturbations. Specifically, we study an Ising symmetry-breaking Hamiltonian with degenerate ground states and a energy gap, and perturb the system with Ising symmetric long-range interactions. Our proof relies on a convergent polymer expansion adapted to handle the long-range interactions. We also discuss applications to physical models, including the Kitaev p-wave wire model perturbed by power-law density-density interactions with an exponent greater than 1.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2023)
Article
Geosciences, Multidisciplinary
Evan J. Gowan, Alessio Rovere, Deirdre D. Ryan, Sebastian Richiano, Alejandro Montes, Marta Pappalardo, Marina L. Aguirre
Summary: The coastal southeast South America has extensive records of past high sea levels, with sea-level proxies interpreted as last interglacial (Marine Isotope Stage 5e, MIS 5e) along the Uruguayan and Argentinian coast, especially in Patagonia. Dating control for these proxies come from various methods, but limitations in precision and accuracy make most of them low quality. The database with 60 MIS 5 proxies is available for reference.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Optics
Muhammad Ali Umair, Marco Seminara, Marco Meucci, Marco Fattori, Francesco Bruni, Sergio Brovelli, Francesco Meinardi, Jacopo Catani
Summary: This paper presents an innovative optical wireless communication system based on a large-area FC receiver using CuInS2 quantum dots. The system achieves error-free VLC links over long distances under strong sunlight exposure, overcoming the limitations of conventional optical stages.
LASER & PHOTONICS REVIEWS
(2023)
Article
Ecology
Danilo Trabuco Amaral, Isis Minhos-Yano, Joao Victor M. Oliveira, Monique Romeiro-Brito, Isabel Aparecida Silva Bonatelli, Nigel Paul Taylor, Daniela Cristina Zappi, Evandro Marsola Moraes, Deren A. R. Eaton, Fernando Faria Franco
Summary: The study found that the diversification of Cereus genus in xeric vegetation is associated with the climatic and geomorphological instabilities of the Pliocene and Pleistocene epochs, with the Cerrado domain in Brazil being an important region for the dispersal of this genus. Some geographical range movements involved in environmental transitions were associated with niche evolution, while others were limited to simple biogeographical transitions without changes in niche.
JOURNAL OF BIOGEOGRAPHY
(2021)
Article
Biochemistry & Molecular Biology
Bennett A. Csorba, Matthew R. Krause, Theodoros P. Zanos, Christopher C. Pack
Summary: Research shows that adults can easily learn to recognize new things through moments of insight, even after the critical period. Synchronization of neural activity between specific areas of the brain is believed to be a mechanism behind this abrupt learning, with the level of synchronization related to image encoding and reward sensitivity.
Article
Computer Science, Information Systems
Jaesin Kim, Inkyu Lee
Summary: This paper considers long range air-to-ground communication systems for aeronautical platforms, presenting measurement results and multipath characteristic analysis at distances of hundreds of kilometers. The experimental results match well with the models, and field test data in various environments are provided.
