Browsing by Author "Castro, M."

Now showing 1 - 5 of 5
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    Accurate metrology for focal plane astronomical instruments
    (SPIE, 2022) Vanzi, Leonardo; Bechet, Clementine Marie Zelia; Flores, M.; Zapata, A.; Parra, M.; Shen, Tzu-chiang; Dunner Planella, Rolando; Castro, M.
    © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.Accurate positioning of opto-mechanical elements in the focal plane of large telescopes is a challenging requirements for many state of the art observational scientific applications. In particular high multiplexing multi object spectroscopy requires precise metrology tools for performing efficient observations and calibrations of the instruments. We have developed a metrology system based on modified commercial off-the-shelf components to reach high performances with a cost effective solution. Our system is based on the photogrammetry technique and on a number of fixed off-axis cameras. The cameras acquire images of the focal plane where metrology targets and references are located. The acquisition is based on Odroid-XU4, a single-board computer running on GNU/Linux. No moving parts in the setup ensures an extremely fast acquisition of the data. The calibration and metrology data processing is based on the computer vision library OpenCV. We present a prototype system and results of the camera calibrations and metrology tests obtained in our laboratory.
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    Comparative branching order and root anatomy of clonal and seed- grown avocado trees (Persea americana Mill.)
    (2020) Fassio, C.; Cautin, R.; Pérez Donoso, Alonso Gastón; Castro, M.; Bonomelli de Pinaga, Claudia María
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    Human development, inequality, and their associations with brain structure across 29 countries
    (Cambridge University Press, 2025) Medel, V.; Alliende, L.M.; Bethlehem, R.; Seidlitz, J.; Ringlein, G.; Arango, C.; Arnatkeviciute, A.; Asmal, L.; Bellgrove, M.; Benegal, V.; Bernardo, M.; Billeke, P.; Bosch-Bayard, J.; Bressan, R.; Busatto, G.; Castro, M.; Chaim-Avancini, T.; Costanzi, M.; Czepielewski, L.; Dazzan, P.; de la Fuente-Sandoval, C.; Diaz-Caneja, C.M.; Diaz-Zuluaga, A.M.; Plessis, S.D.; Duran, F.; Fittipaldi, S.; Fornito, A.; Freimer, N.; Gadelha, A.; Gama, C.; Garani, R.; Garcia-Rizo, C.; Campo, C.G.; Gonzalez-Valderrama, A.; Guinjoan, S.; Holla, B.; Ibanez, A.; Ivanovic, D.; Jackowski, A.; Leon-Ortiz, P.; Lochner, C.; Lopez-Jaramillo, C.; Luckhoff, H.; Massuda, R.; McGuire, P.; Miyata, J.; Mizrahi, R.; Murray, R.; Ozerdem, A.; Pan, P.; Parellada, M.; Phahladira, L.; Ramirez-Mahaluf, J.P.; Reckziegel, R.; Marques, T.R.; Reyes-Madrigal, F.; Roos, A.; Rosa, P.; Salum, G.; Scheffler, F.; Schumann, G.; Serpa, M.; Stein, D.J.; Tepper, A.; Tiego, J.; Ueno, T.; Undurraga, J.; Undurraga, Eduardo A.; Valdes-Sosa, P.; Valli, I.; Villarreal, M.; Winton-Brown, T.; Yalin, N.; Zamorano, F.; Zanetti, M.; Winkler, A.; Evans-Lacko, S.; Forti, M.D.; Crossley, N.A.
    © 2025 Cambridge University Press. All rights reserved.Background: The macro-social and environmental conditions in which people live, such as the level of a country’s development or inequality, are associated with brain-related disorders. However, the relationship between these systemic environmental factors and the brain remains unclear. We here aimed to determine the association between the level of development and inequality of a country and the brain structure of healthy adults. Methods: We conducted a cross-sectional study pooling brain imaging (T1-based) data from 145 magnetic resonance imaging (MRI) studies in 7,962 healthy adults (4,110 women) in 29 different countries. We used a meta-regression approach to relate the brain structure with the country’s level of development and inequality. Results: Higher human development was consistently associated with larger hippocampi and more expanded global cortical surface area, particularly in frontal areas. Increased inequality was most consistently associated with smaller hippocampal volume and thinner cortical thickness across the brain. Conclusions: Our results suggest that the macro-economic conditions of a country are reflected in its inhabitants’ brains and may explain the different incidence of brain disorders across the world. The observed variability of brain structure in health across countries should be considered when developing tools in the field of personalized or precision medicine that are intended to be used across the world.
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    In Silico characterization of Nitric Oxide Adsorption on a Magnetic [B24N36 Fullerene/(TiO2)2] − Nanocomposite
    (2017) Anota, E.; Cortés Arriagada, Diego; Hernández, A.; Castro, M.
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