650 research outputs found
Recovery, overloading, and protein interactions in asymmetrical flow field-flow fractionation
Flat type thick film inductive sensors
Two thick film flat-type inductive sensors are described and tested for distance and profile measurement. The first one is a single-layer spiral while the second one is a multi-layer structure consisting of ten spirals one over the other. The paper describes their geometric configurations together with their simulated magnetic fields and it reports the results from the characterization test i.e. the series-equivalent circuit parameters, the sensitivity and the cross-sensitivity to temperature. An experimental analysis of the sensitivity suggests that optimized values are obtained by an appropriate choice of the working frequency. The sensors are shielded against e.m. noise coming from the nonsensitive area. Moreover, two sensors have been tested in the laboratory using the single layer as a distance sensor and the multi-layer as a transducer for the measurement of a metallic object profile. The results of the tests show a maximum sensitivity of 14mV/µm and a resolution of 0.6 µm for the single layer, while the multi layer one reconstructs the profile with an axial resolution of a few microns and a lateral resolution better than 200 mm
Pyroelectric effect in PZT thick films for thermal energy harvesting in low-power sensors
Abstract Thermal-electrical energy converters based on pyroelectric effect are investigated for energy harvesting and possible use in ultralow-power sensor modules. Different elements based on thick films of lead zirconate titanate (PZT) sandwiched between metal electrodes deposited on alumina substrate were fabricated and characterized. The charge extracted was stored into a capacitor comparing performances offered by different rectifying circuits. Results show that the harvested energy can be compatible with use in autonomous sensors working in low-duty-cycle switched-supply mode
Urban mobility and accessibility in terms of gender: The case of Textilana workers in the General Pueyrredon District
El objetivo de este trabajo es abordar las caracterÃsticas de la industria textil a nivel nacional y, fundamentalmente, a escala local; más precisamente las condiciones laborales, en tanto movilidad y accesibilidad de lxs trabajadorxs a sus lugares de trabajo. Para ello, se analizará el caso de la planta de la empresa textil marplatense Textilana. Para dar cuenta de esto, se realizará un mapeo de los domicilios de lxs trabajadorxs, vinculando sus localizaciones con la de la empresa y el trazado del sistema público de transporte urbano colectivo de pasajerxs intra e interurbano del Partido de General Pueyrredón. Con este fin, se utilizará una base de datos de elaboración propia, construida a partir de los expedientes judiciales de los tribunales de trabajo 1 y 2 de la ciudad de Mar del Plata, desde 2007 hasta 2019. El enfoque de este trabajo es interseccional, puesto que el sector analizado cuenta con una amplia presencia de mujeres que se encuentran doblemente vulneradas por su condición de género -mujer- y de clase -trabajadora-.The goal of this work is to address the characteristics of the textile industry at the national level and, fundamentally, at the local level; more precisely the working conditions, in terms of mobility and accessibility of workers to their workplaces. For this, the case of the plant of the textile company Textilana will be analyzed. To account for this, a mapping of the homes of the workers will be carried out, linking their locations with that of the company and the intra- and inter-urban public transport route of the General Pueyrredón District. To this end, a self-made database will be used, built from the judicial files of Labor Courts 1 and 2 of the city of Mar del Plata, from 2007 to 2019. The focus of this work is intersectional, since the analyzed sector has a large presence of women who are doubly vulnerable due to their gender -women- and class -worker- status.Fil: Marioli, Eliana. Universidad Nacional de Mar del Plata. Universidad Nacional de Luján. Consejo Nacional de Investigaciones CientÃficas y Técnicas; Argentin
Contactless electromagnetic switched interrogation of micromechanical cantilever resonators
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A single-magnet nonlinear piezoelectric converter for enhanced energy harvesting from random vibrations
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Utilization of special potential scan programs for cyclic voltammetric development of different nickel oxide-hydroxide species on Ni based electrodes
Special potential scan programs were designed for cyclic voltammetric development of β-NiOOH or γ-NiOOH/ β-NiOOH mixtures on the surface of nickel or nickel-chromium (80:20) alloy electrodes in NaOH 0.10 M. The programs consisted on changing the anodic or cathodic switching limit to facilitate the chemical reactions taking place either between Ni(II) hydroxides or between Ni(III) oxides-hydroxides. The electrochemical charge density under the oxidative wave, observed at Ni or Ni-Cr electrode surfaces at approximately 0.48 V (vs SCE), remained almost con- stant with the number of cv cycles after approximately 600 cv cycles at 0.050 V/s. Thus, it can be suggested that a stable proportion of Ni(II)/Ni(III) oxides-hydroxides was obtained on the electrode surfaces. The relative amounts of β-NiOOH or γ-NiOOH species were calculated from the electrochemical charges under their reduction waves in the voltammetric experiments. Higher charge densities were always obtained with Ni-Cr alloy electrodes as compared to pure Ni electrodes. Linear relationships were obtained in our study on the dependence of the oxidative peak current with the square root of the scan rate at a scan rate range between 0.01 V/s and 0.16 V/s.Facultad de Ciencias Exacta
Dinámicas de Aprendizaje en el Mercado de Trabajo
Fuera de los modelos RBC, los mercados de trabajo han sido estudiados de muchas maneras, siendo la literatura de "matching" y "search" la de mayor relevancia. En estos últimos esquemas, los agentes deben salir y buscar trabajo en un mundo muy amplio, donde no necesariamente toda la información relevante es conocida. Por tanto, la transmisión de información y sus diversos mecanismos juegan un rol importante. Además, ya que en muchos casos la información se transmite mediante señales de origen aleatorio, los agentes se vuelven heterogéneos debido a que presentan conjuntos de información idiosincráticos. Por lo tanto, la agregación se convierte en un problema a tener en cuenta. Más importante aún, los mecanismos de aprendizaje pueden introducir dinámicas de transición. En este trabajo propongo simular un modelo simple que permita estudiar la dinámica del aprendizaje en el mercado laboral. Los resultados teóricos indican que, si bien puede existir el aprendizaje, cuantitativamente hablando sus efectos no serÃan significativos para algunas variables macro como salario promedio y desempleo. Por último, también encuentro que la agregación es un elemento importante a la hora de tener en cuenta, sobre todo comparado con el "approach" del agente representativo.Por motivos relacionados con los derechos de autor este documento solo puede ser consultado en la Biblioteca Di Tella. Para reservar una cita podés ponerte en contacto con [email protected]. Si sos el autor de esta tesis y querés autorizar su publicación en este repositorio, podés ponerte en contacto con [email protected]
Urban mobility and accessibility in terms of gender: The case of Textilana workers in the General Pueyrredon District
El objetivo de este trabajo es abordar las caracterÃsticas de la industria textil a nivel nacionaly, fundamentalmente, a escala local; más precisamente las condiciones laborales, en tantomovilidad y accesibilidad de lxs trabajadorxs a sus lugares de trabajo. Para ello, se analizaráel caso de la planta de la empresa textil marplatense Textilana. Para dar cuenta de esto, serealizará un mapeo de los domicilios de lxs trabajadorxs, vinculando sus localizaciones con lade la empresa y el trazado del sistema público de transporte urbano colectivo de pasajerxs intrae interurbano del Partido de General Pueyrredón. Con este fin, se utilizará una base de datosde elaboración propia, construida a partir de los expedientes judiciales de los tribunales detrabajo 1 y 2 de la ciudad de Mar del Plata, desde 2007 hasta 2019. El enfoque de este trabajoes interseccional, puesto que el sector analizado cuenta con una amplia presencia de mujeresque se encuentran doblemente vulneradas por su condición de género -mujer- y de clase -trabajadora-.The goal of this work is to address the characteristics of the textile industry at the national level and, fundamentally, at the local level; more precisely the working conditions, in terms of mobility and accessibility of workers to their workplaces. For this, the case of the plant of the textile company Textilana will be analyzed. To account for this, a mapping of the homes of the workers will be carried out, linking their locations with that of the company and the intra- and inter-urban public transport route of the General Pueyrredón District. To this end, a self-made database will be used, built from the judicial files of Labor Courts 1 and 2 of the city of Mar del Plata, from 2007 to 2019. The focus of this work is intersectional, since the analyzed sector has a large presence of women who are doubly vulnerable due to their gender -women- and class - worker- status.Fil: Marioli, Eliana Margarita. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Mar del Plata. Instituto de Humanidades y Ciencias Sociales. Universidad Nacional de Mar del Plata. Instituto de Humanidades y Ciencias Sociales; Argentin
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