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Ferrofluid measurements of bottom velocities and shear stresses

Journal of Hydrodynamics 2015年第1期27卷 150-158页

作者： MUSUMECI Rosaria E. MARLETTA Vincenzo ANDò Bruno baglio salvatore FOTI Enrico Department of Civil Engineering and Architecture University of Catania Department of Electric Electronic and Computer Science Engineering University of Catania

A novel direct measurement strategy of bottom velocities and shear stresses based on the use of ferrofluids is presented. Such a strategy overcomes some of the limits of state-of-the-art instruments. A preliminary experimental campaign has been carried out in the presence of currents in steady flow conditions in order to test the effects of ferrofluid quantity and of the controlling permanent magnetic force. An alternating current （AC） circuit and a direct current （DC） conditioning circuit have been tested. For velocities larger than 0.05 m/s, the near-bottom velocity-output voltage calibration curve has a monotone parabolic shape. The sensitivity of the instrument is increased by a factor of 30 when the DC circuit is used.

关键词： magnetofluids Rosensweig effect flow resistances bed shear stresses bottom velocities

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A Smart Multi-Sensor Approach to Monitoring Weak People in Indoor Environments

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Journal of Sensor Technology 2014年第1期4卷 24-35页

作者： Bruno Andò salvatore baglio Antonio Pistorio D.I.E.E.I. University of Catania Catania Italy

This paper deals with a novel system to assist weak people while exploring indoor environments. The proposed architecture is aimed to monitor the position and inertial behavior of users as well as environmental status (e.g. temperature, humidity, gases leakage, or smoke). The system is based on a Wireless Sensor Network and smart paradigms which extract relevant information from data collected through the multi-sensor architecture. The data collected are then processed to build awareness of User-Environment Interaction and User-Environment Contextualization. This knowledge is used to build information that is useful to the user for safe and efficient exploitation of the environment and to the supervisor for a suitable assessment and management of hazard situations. The paper mainly focuses on the multi-sensor system architecture and smart paradigms used to implement the User-Environment Contextualization feature.

关键词： WSN Weak People Monitoring Assistive Systems Sensor Data Fusion User-Environment Contextualization User-Environment Interaction

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Evaluation of hot pressing parameters on the electrochemical performance of MEAs based on Aquivion^(■) PFSA membranes

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Journal of Energy Chemistry 2019年第8期28卷 168-173,I0006页

作者： Irene Gatto Ada Sacca Vincenzo baglio Antonino salvatore Arico Claudio Oldani Luca Merlo Alessandra Carbone CNR-ITAE Institute for Advanced Energy Technologies"N. Giordano" Via S. Lucia Sopra Contesse 5Messina Italy Solvay Specialty Polymers Viale Lombardia 20 20021 Bollate MI Italy

The membrane-electrodes assembly(MEA) is the core of the Polymer Electrolyte Fuel Cell(PEFC). It consists of a membrane, catalytic(CL) and gas diffusion layers(GDL). In order to manufacture MEAs with suitable performance, a hot-pressing procedure is generally used. The relevant parameters are the temperature, pressure and time of hot-pressing. Such variables need to be adjusted as a function of the type of ionomer used in the catalytic layer and membrane. In this study, an evaluation of the temperature of hot-pressing was carried out and its influence on MEA electrochemical performance was assessed. In particular, preparation trials of MEAs were carried out with reinforced experimental membranes based on Aquivion^■ short-side-chain PFSA(by Solvay Specialty Polymers). The membranes were coupled to gas diffusion electrodes, and MEAs were manufactured using different temperatures for the hot-pressing procedure in order to evaluate their influence on the electrochemical performance of PEFCs, in the temperature range of 80–95 °C, with low relative humidity of the reactant gases. The electrochemical performance of the prepared MEAs was tested in a H2/Air 25 cm^2 single cell in terms of polarization curves and accelerated stress test(AST).

关键词： Aquivion^(■) Short-side chain PEFC Hot-pressing parameters Automotive applications

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