Papers by Patrizia Livreri
Materials Today: Proceedings, 2017
UPM bio-fibrils are nano-structured cellulose fibers (nano-fibrils) produced by UPM Kymmene-Corpo... more UPM bio-fibrils are nano-structured cellulose fibers (nano-fibrils) produced by UPM Kymmene-Corporation, a Finnish company. This paper reports a preliminary study about nano-fibrils to determine their possible use for restoration of historical mortars and plasters. The aim of this study is to investigate the behavior of some mixtures added with nano-fibrils in their properties for conservative purposes. These mixtures reproduce the composition of historical mortars and plasters, made of natural hydraulic lime (NHL 3.5) and river sand. After 28 days of hardening, the properties of specimens with nano-fibrils were compared with untreated one to understand how nano-fibrils interact with inorganic matrix. They influenced the mortar properties in different ways. For example, mechanical tests showed a decrease of flexural and compressive strength as the percentage of nano-fibrils increased.
Nanostructured protective for historical-artistic stone materials: evaluation of effectiveness and persistence by non invasive techniques
Atti del I Convegno Internazionale Nanotech for Architecture. Innovative technologies, techniques and nanostructured materials
... Leone, MF; Daniotti, B; Lupica Spagnolo, S; Ridley, I; Sposito, C; Milioto, S; Piraino, P; De... more ... Leone, MF; Daniotti, B; Lupica Spagnolo, S; Ridley, I; Sposito, C; Milioto, S; Piraino, P; De Lisi, R; Lazzara, G; Muratore, N; Cardiano, P; Fernandez, F; Ruggirello, VL; D'Agostino, F; Bertolini Cestari, C; Marzi, T; invernizzi, S; Tulliani, JM; Carruba, L; Casaletto, MP; Brai, M; Fiore ...
Prawidlowa Ciąza U Pacjentki Po Operacji Oszczedzającej Plodnośc Z Powodu Raka Jajnika W Stopniu Ic I Guza O Granicznej Zlośliwości Po Stronie Przeciwnej
Termedia Publishing House, Dec 5, 2011
Nanostructured materials for solar cells: electrochemical fabrication and characterization
A Fuell Cell-Based Hybrid Power Supply for Portable Electronics Devices
Micro Fuel Cell for Powering Portable Electronic Market
Non-Linear Digital Control for DC-DC Power Converter
PWM DC/DC converter based on an innovative current sensing technique
IEEE Transactions on Applied Superconductivity, 2022
The advent of ultra-low noise microwave amplifiers revolutionized several research fields demandi... more The advent of ultra-low noise microwave amplifiers revolutionized several research fields demanding quantum-limited technologies. Exploiting a theoretical bimodal description of a linear phase-preserving amplifier, in this contribution we analyze some of the intrinsic properties of a model architecture (i.e., an rf-SQUID based Josephson Traveling Wave Parametric Amplifier) in terms of amplification and noise generation for key case study input states (Fock and coherent). Furthermore, we present an analysis of the output signals generated by the parametric amplification mechanism when thermal noise fluctuations feed the device.
A Battery-Free Smart Sensor Powered with RF Energy
2018 IEEE 4th International Forum on Research and Technology for Society and Industry (RTSI), 2018
The development of Internet of Things (IoT) infrastructure and applications is stimulating advanc... more The development of Internet of Things (IoT) infrastructure and applications is stimulating advanced and innovative ideas and solutions, some of which are pushing the limits of state-of-the-art technology. The increasing demand for Wireless Sensor Network (WSN) that must be capable of collecting and sharing data wirelessly while often positioned in places hard to reach and service, motivates engineers to look for innovative energy harvesting and wireless power transfer solutions to implement battery-free sensor nodes. Due to the pervasiveness of RF (Radio Frequency) energy, RF harvesting that can reach out-of-sight places could be a key technology to wirelessly power IoT sensor devices, which in order to be ubiquitous, need to be wireless, maintenance-free, battery-free and low cost enough to be used almost anywhere. In this article the implementation of an RF power transfer system for battery-free wireless sensor nodes will be shown. The system comprises an RF power transmitter which delivers a power of 0.5 W at 900 MHz and an RF energy harvesting which is used as an RF power receiver to power a battery-free sensor node. Experimental results will show how the system can feed a 10 mA load for a 50 ms acquisition time with the transmitted power delivered from several distances.
Novel Computational Method for Harmonic Mitigation for Three-phase Five-level Cascaded H-Bridge Inverter
2018 International Conference on Smart Grid (icSmartGrid), 2018
The efficiency of the system is a very important parameter for high power electrical drives appli... more The efficiency of the system is a very important parameter for high power electrical drives applications,. Moreover, in the system the efficiency of the power converter play a fundamental role and for this reason, the soft switching modulation techniques represent the best choice. This paper presents a novel computational method for harmonic mitigation on the output voltage of a five-level, three-phase Cascaded H-Bridge Inverter without solving non-linear equations. Through this simple approach the Working Areas have been identified in which the harmonics reference have minimum amplitude possible. Moreover, polynomial equations to evaluate the control angels have been found. In this way, through the polynomial equations can be possible to approximate the trend of the control angles versus fundamental amplitude and without solving nonlinear equations the control angles can be evaluated. The obtained polynomial equations can be easily implemented in a digital system to real-time operation. The paper also presents the circuit simulation analysis in MatLab/PLECS environment.
High-rate cycling performance of lead-acid batteries with nanostructured electrodes
2021 AEIT International Conference on Electrical and Electronic Technologies for Automotive (AEIT AUTOMOTIVE), 2021
New approach for harmonic mitigation in single-phase five-level CHBMI with fundamental frequency switching
2017 Twelfth International Conference on Ecological Vehicles and Renewable Energies (EVER), 2017
The main objective of this paper is to study and analyse the voltage output waveform of a multile... more The main objective of this paper is to study and analyse the voltage output waveform of a multilevel inverter, to suggest a new approach for harmonic mitigation improving the converter performance. These last type of converters represent a new technology in the field of DC/AC electrical energy conversion, presenting advantages respect to the traditional converters. In fact, the multilevel power converters present a low harmonic content and a high voltage level. The paper considers a five-level single-phase cascaded H-bridge inverter and fundamental frequency modulation techniques. The voltage waveform analysis has allowed to identify a working area of the converter where there are lowest values of the considered harmonic amplitude. The simulated behaviour of the model of the converter, with the logic piloting gate signals, has been obtained in Matlab-Simulink environment.
Evaluation of ammonium phosphates as consolidating agent for carbonatic stone used in Sicily
Conserving Cultural Heritage, 2018
Design of a Battery/Ultracapacitor Energy Storage System for Electric Vehicle Applications
2018 IEEE 4th International Forum on Research and Technology for Society and Industry (RTSI), 2018
The battery/ultracapacitors (UCs) integration is able to provide notable advantages in the power ... more The battery/ultracapacitors (UCs) integration is able to provide notable advantages in the power management of an electric vehicle (EV), in terms of capability of both high energy storage and readiness to deal with fast load variations. In order to manage the charge (or discharge) of the UCs from (or towards) a DC voltage bus, a proper bi-directional converter is required. In this paper, a bi-directional DC-DC converter in connection with a stack of UCs is described and some power simulation results are provided. The proposed converter is a B2R (buck-boost regulator) type. The load is represented by a 40kW peak power, kept for a time window of 3s, as required by the Worldwide harmonized Light vehicles Test Procedure (WL TP).
Trade-off Performance of Optical Nanoantennas for Solar Energy Harvesting Applications
2019 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), 2019
In this paper, the optimum behaviour of optical nanoantennas, in terms of impedance, directivity,... more In this paper, the optimum behaviour of optical nanoantennas, in terms of impedance, directivity, available power, and field enhancement, at a resonance frequency of about 350 THz, will be shown. Optimum configurations are obtained by varying nanoantennas geometry in order to maximize the available power, enhancing the electric field in gap proximity and so the absorptivity. Moreover, the simulation results for aluminum nanoantennas on a three-layers substrate, will be reported, and a trade-off performance comparison among different antennas will be discussed. This study can guide both the engineering and the fabrication of plasmonic nanoantennas.
Considerations on LNA design for VSAT applications based on a new method
Proceedings of 1997 Asia-Pacific Microwave Conference
ABSTRACT In this paper we present the performance of a low-noise amplifier for microwave communic... more ABSTRACT In this paper we present the performance of a low-noise amplifier for microwave communication systems based on a set of HEMTs (NE20283A, by NEC), characterized and modeled according with a simplified method of our noise figure measuring system driven by a proprietary procedure. The results of the comparison with the standard method are also reported
Nanostructured products for the conservation of the wooden supports: Evaluation of their effectiveness and durability
Science and Technology for the Conservation of Cultural Heritage, 2013
Renewable Energy and Power Quality Journal, 2016
(Italy), email: chiara.digarbo(at)unipa.it, patrizia.livreri(at)unipa.it 2 Istituto di Studi sui ... more (Italy), email: chiara.digarbo(at)unipa.it, patrizia.livreri(at)unipa.it 2 Istituto di Studi sui Sistemi Intelligenti per l'Automazione (ISSIA), Consiglio Nazionale delle Ricerche (CNR), Via Dante Alighieri, n. 12-90141Palermo (Italy), corresponding author, email: gianpaolo.vitale(at)cnr.it
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Papers by Patrizia Livreri