Examinando por Materia "CAMPOS MAGNETICOS"

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  • Proyecto final de Grado
    Diseño y fabricación de un sistema de transporte controlado de nanopartículas superparamagnéticas para su integración a un biosensor
    (2020) Altamirano Carlavan, María Agustina; Mosquera, Valeria; Notcovich, Cintia; Berlín, Guillermo Luis
    "El trabajo presenta el diseño, la fabricación y la caracterización de un sistema de transporte controlado de nanopartículas superparamagnéticas (NPM) que se fundamenta en el uso de los campos magnéticos resultantes de la circulación de corrientes eléctricas. Se concibe con el objetivo de ser integrado a un sistema de diagnóstico del Síndrome Urémico Hemolítico (SUH) que utiliza NPM funcionalizadas con anticuerpos capaces de unirse específicamente a la bacteria causante del mismo. El proyecto Micromaglab (MAGLAB) está actualmente desarrollando este dispositivo de tipo Lab-on-a-Chip (LoC) en el Departamento de Micro y Nanotecnología del Centro Atómico Constituyentes (CAC) perteneciente a la Comisión Nacional de Energía Atómica (CNEA)."
  • Ponencia en Congreso
    Fusion of magnetic and WiFi fingerprints for indoor positioning
    (2018) Grisales Campeón, Juan Pablo; López, Sebastián; de Jesús Meleán, Sergio R.; Moldovan, Horatiu; Parisi, Daniel; Fierens, Pablo Ignacio
    "WiFi received signal strength (RSS) and magnetic field intensity are common measures for indoor localization because they are readily available on most mobile devices. There is a vast literature on smartphone positioning using RSS and it has been widely implemented in real-world scenarios in the last two decades. There is much work done on localization aided by magnetic field measurements. We have recently evaluated the accuracy of RSS-based positioning applying state-of-the-art algorithms to measurements in a well-controlled experimental setup. In this paper, we extend this work to assess the accuracy improvements achievable by fusing WiFi and magnetic field information. We show that accuracy improvements of up to 30% are possible."
  • Artículo de Publicación Periódica
    Obtaining accurate and calibrated coil models for transcranial magnetic stimulation using magnetic field measurements
    (2020) Mancino, Axel; Milano, Federico E.; Martín-Bertuzzi, Fiorella; Yampolsky, C. G.; Ritacco, Lucas E.; Risk, Marcelo
    "Currently, simulations of the induced currents in the brain produced by transcranial magnetic stimulation (TMS) are used to elucidate the regions reached by stimuli. However, models commonly found in the literature are too general and neglect imperfections in the windings. Aiming to predict the stimulation sites in patients requires precise modeling of the electric field (E-field), and a proper calibration to adequate to the empirical data of the particular coil employed. Furthermore, most fabricators do not provide precise information about the coil geometries, and even using X-ray images may lead to subjective interpretations. We measured the three components of the vector magnetic field induced by a TMS figure-8 coil with spatial resolutions of up to 1 mm. Starting from a computerized tomography-based coil model, we applied a multivariate optimization algorithm to automatically modify the original model and obtain one that optimally fits the measurements. Differences between models were assessed in a human brain mesh using the finite-elements method showing up to 6% variations in the E-field magnitude. Our calibrated model could increase the precision of the estimated E-field induced in the brain during TMS, enhance the accuracy of delivered stimulation during functional brain mapping, and improve dosimetry for repetitive TMS."