47 research outputs found

    Solution-processed organic devices developed by a novel cost-effective patterning technique based on electrical erosion

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    Application of arc erosion to the patterning of metallic contacts in organic devices is presented. A home-made systems and details of the working principles are described. Advantages and drawbacks of this novel technology are discussed

    The use of arc-erosion as a patterning technique for transparent conductive materials

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    Within the framework of cost-effective patterning processes a novel technique that saves photolithographic processing steps, easily scalable to wide area production, is proposed. It consists of a tip-probe, which is biased with respect to a conductive substrate and slides on it, keeping contact with the material. The sliding tip leaves an insulating path (which currently is as narrow as 30 ÎŒm) across the material, which enables the drawing of tracks and pads electrically insulated from the surroundings. This ablation method, called arc-erosion, requires an experimental set up that had to be customized for this purpose and is described. Upon instrumental monitoring, a brief proposal of the physics below this process is also presented. As a result an optimal control of the patterning process has been acquired. The system has been used on different substrates, including indium tin oxide either on glass or on polyethylene terephtalate, as well as alloys like Au/Cr, and Al. The influence of conditions such as tip speed and applied voltage is discusse

    Temporal series analysis of population cycle threshold counts as a predictor of surge in cases and hospitalizations during the SARS-CoV-2 pandemic

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    Tools to predict surges in cases and hospitalizations during the COVID-19 pandemic may help guide public health decisions. Low cycle threshold (CT) counts may indicate greater SARS-CoV-2 concentrations in the respiratory tract, and thereby may be used as a surrogate marker of enhanced viral transmission. Several population studies have found an association between the oscillations in the mean CT over time and the evolution of the pandemic. For the first time, we applied temporal series analysis (Granger-type causality) to validate the CT counts as an epidemiological marker of forthcoming pandemic waves using samples and analyzing cases and hospital admissions during the third pandemic wave (October 2020 to May 2021) in Madrid. A total of 22,906 SARS-CoV-2 RT-PCR-positive nasopharyngeal swabs were evaluated; the mean CT value was 27.4 (SD: 2.1) (22.2% below 20 cycles). During this period, 422,110 cases and 36,727 hospital admissions were also recorded. A temporal association was found between the CT counts and the cases of COVID-19 with a lag of 9–10 days (p ≀ 0.01) and hospital admissions by COVID-19 (p < 0.04) with a lag of 2–6 days. According to a validated method to prove associations between variables that change over time, the short-term evolution of average CT counts in the population may forecast the evolution of the COVID-19 pandemic

    Ensayos sobre aplicaciĂłn de la TeorĂ­a del Estado en las algunas culturas del PerĂș antiguo

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    Investigations of State Theory on the cultures of ancient Peru.CapĂ­tulos de libro con investigaciones de TeorĂ­a del Estado sobre las culturas del PerĂș antiguo, realizado por docentes y estudiantes de la Escuela Profesional de Derecho de la Universidad Nacional del Altiplano de Puno.      

    Ensayos sobre aplicaciĂłn de la TeorĂ­a del Estado en las algunas culturas del PerĂș antiguo

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    Investigations of State Theory on the cultures of ancient Peru.CapĂ­tulos de libro con investigaciones de TeorĂ­a del Estado sobre las culturas del PerĂș antiguo, realizado por docentes y estudiantes de la Escuela Profesional de Derecho de la Universidad Nacional del Altiplano de Puno.      

    Ensayos sobre aplicaciĂłn de la TeorĂ­a del Estado en las algunas culturas del PerĂș antiguo

    Get PDF
    Investigations of State Theory on the cultures of ancient Peru.CapĂ­tulos de libro con investigaciones de TeorĂ­a del Estado sobre las culturas del PerĂș antiguo, realizado por docentes y estudiantes de la Escuela Profesional de Derecho de la Universidad Nacional del Altiplano de Puno.      

    Ensayos sobre aplicaciĂłn de la TeorĂ­a del Estado en las algunas culturas del PerĂș antiguo

    Get PDF
    Investigations of State Theory on the cultures of ancient Peru.CapĂ­tulos de libro con investigaciones de TeorĂ­a del Estado sobre las culturas del PerĂș antiguo, realizado por docentes y estudiantes de la Escuela Profesional de Derecho de la Universidad Nacional del Altiplano de Puno.      

    Ensayos sobre aplicaciĂłn de la TeorĂ­a del Estado en las algunas culturas del PerĂș antiguo

    Get PDF
    Investigations of State Theory on the cultures of ancient Peru.CapĂ­tulos de libro con investigaciones de TeorĂ­a del Estado sobre las culturas del PerĂș antiguo, realizado por docentes y estudiantes de la Escuela Profesional de Derecho de la Universidad Nacional del Altiplano de Puno.      

    Ensayos sobre aplicaciĂłn de la TeorĂ­a del Estado en las algunas culturas del PerĂș antiguo

    Get PDF
    Investigations of State Theory on the cultures of ancient Peru.CapĂ­tulos de libro con investigaciones de TeorĂ­a del Estado sobre las culturas del PerĂș antiguo, realizado por docentes y estudiantes de la Escuela Profesional de Derecho de la Universidad Nacional del Altiplano de Puno.      

    Ensayos sobre aplicaciĂłn de la TeorĂ­a del Estado en las algunas culturas del PerĂș antiguo

    Get PDF
    Investigations of State Theory on the cultures of ancient Peru.CapĂ­tulos de libro con investigaciones de TeorĂ­a del Estado sobre las culturas del PerĂș antiguo, realizado por docentes y estudiantes de la Escuela Profesional de Derecho de la Universidad Nacional del Altiplano de Puno.      
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