4,324 research outputs found

    Non-Binary in Higher Education Survey Findings Report and Recommendations

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    This report contains the findings from the Non-Binary in Higher Education: Lived Experiences, Imagined Futures project survey conducted in 2019. It also makes recommendations based on the findings

    Design and modeling of an integrated flywheel magnetic suspension for kinetic energy storage systems

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    The paper presents a novel configuration of an axial hybrid magnetic bearing (AHMB) for the suspension of steel flywheels applied in power-intensive energy storage systems. The combination of a permanent magnet (PM) with excited coil enables one to reduce the power consumption, to limit the system volume, and to apply an effective control in the presence of several types of disturbances. The electromagnetic design of the AHMB parts is carried out by parametric finite element analyses with the purpose to optimize the force performances as well as the winding inductance affecting the electrical supply rating and control capability. Such investigation considers both the temperature dependence of the PM properties and the magnetic saturation effects. The electrical parameters and the force characteristics are then implemented in a control scheme, reproducing the electromechanical behavior of the AHMB-flywheel system. The parameter tuning of the controllers is executed by a Matlab/Simulink code, examining the instantaneous profiles of both the air-gap length and the winding ampere-turns. The results of different dynamic tests are presented, evidencing the smooth air-gap changes and the optimized coil utilization, which are desirable features for a safe and efficient flywheel energy storage

    Radon mitigation during the installation of the CUORE 0Ī½Ī²Ī²0\nu\beta\beta decay detector

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    CUORE - the Cryogenic Underground Observatory for Rare Events - is an experiment searching for the neutrinoless double-beta (0Ī½Ī²Ī²0\nu\beta\beta) decay of 130^{130}Te with an array of 988 TeO2_2 crystals operated as bolometers at āˆ¼\sim10 mK in a large dilution refrigerator. With this detector, we aim for a 130^{130}Te 0Ī½Ī²Ī²0\nu\beta\beta decay half-life sensitivity of 9Ɨ10259\times10^{25} y with 5 y of live time, and a background index of ā‰²10āˆ’2\lesssim 10^{-2} counts/keV/kg/y. Making an effort to maintain radiopurity by minimizing the bolometers' exposure to radon gas during their installation in the cryostat, we perform all operations inside a dedicated cleanroom environment with a controlled radon-reduced atmosphere. In this paper, we discuss the design and performance of the CUORE Radon Abatement System and cleanroom, as well as a system to monitor the radon level in real time.Comment: 10 pages, 6 figures, 1 tabl

    UtilizaĆ§Ć£o de Pseudomanas fluorescens no controle biolĆ³gico de Macrophomina phaseolina.

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    Calibration sources for the LEGEND-200 experiment

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    In the search for a monochromatic peak as the signature of neutrinoless double beta decay an excellent energy resolution and an ultra-low background around the Q-value of the decay are essential. The LEGEND-200 experiment performs such a search with high-purity germanium detectors enriched in 76Ge immersed in liquid argon. To determine and monitor the stability of the energy scale and resolution of the germanium diodes, custom-made, low-neutron emission 228Th sources are regularly deployed in the vicinity of the crystals. Here we describe the production process of the 17 sources available for installation in the experiment, the measurements of their alpha- and gamma-activities, as well as the determination of the neutron emission rates with a low-background LiI(Eu) detector operated deep underground. With a flux of (4.27Ā±0.60statĀ±0.92syst)Ɨ10āˆ’4 n / (kBqā‹…s), approximately one order of magnitude below that of commercial sources, the neutron-induced background rate, mainly from the activation of 76Ge, is negligible compared to other background sources in LEGEND-200
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