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showing 10 items of 2224 documents

A Smart Sensing Method for Real- Time Monitoring of Low Voltage Series-Arc-Fault

2020

This paper proposes a smart sensing method for real-time monitoring of low voltage series arc fault. It is based on the wavelet coefficient mean-difference algorithm and the four spikes appearing within two fundamental periods criterion with adaptive threshold. The method also uses the hard thresholding wavelet denoising with the universal threshold. An arc fault factor and a load adaptation factor are introduced and combined with a correction factor, so allowing the selection of the adaptive threshold in real-time and the series arc fault detection.

Series arc faultSeries (mathematics)Computer science020208 electrical & electronic engineeringArc-fault circuit interrupter02 engineering and technologyArc fault current interrupter (AFCI)ThresholdingSettore ING-IND/31 - ElettrotecnicaWavelet0202 electrical engineering electronic engineering information engineeringElectronic engineeringWavelet denoisingSettore ING-INF/07 - Misure Elettriche E ElettronicheLow voltagearc fault detection devices (AFDD)2020 IEEE 20th Mediterranean Electrotechnical Conference ( MELECON)
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On Using “Stochastic Learning on the Line” to Design Novel Distance Estimation Methods

2018

In this paper, we consider the problem of Distance Estimation (DE) when the inputs are the x and y coordinates of the points under consideration. The aim of the problem is to yield an accurate value for the real (road) distance between the points specified by the latter coordinates. This problem has, typically, been tackled by utilizing parametric functions called Distance Estimation Functions (DEFs). The parameters are learned from the training data (i.e., the true road distances) between a subset of the points under consideration. We propose to use Learning Automata (LA)-based strategies to solve the problem. In particular, we resort to the Adaptive Tertiary Search (ATS) strategy, propose…

Set (abstract data type)Scheme (programming language)Current (mathematics)Learning automataComputer scienceLine (geometry)Function (mathematics)Parametric equationAlgorithmcomputercomputer.programming_languagePower (physics)
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Architecture and kinematics of forearc basins and intra-caldera resurgences: new insight from the Paola Basin (western offshore Calabria region) and …

This thesis deals with the patterns of tectonic deformation at different time and spatial scales ranging from tens to millions of years and from one to tens of kilometers, respectively. The study areas are the Campi Flegrei (Campania region, Italy) and Paola Basin (western offshore Calabria region, Italy). The Campi Flegrei and its offshore prolongation, the Pozzuoli Bay, are a laboratory for investigating volcano-tectonic deformations at 1yr-1kyr timescale and 1km spatial scale related to the dynamics of the Neapolitan Yellow Tuff (NYT) caldera and its intra-caldera resurgence. Resurgence is the late stage, long-term uplift of a collapse caldera floor to form a dome-like structure. The com…

Settore GEO/03 - Geologia StrutturaleCaldera Resurgence Reverse faults Campi Flegrei Pozzuoli BayCalabrian Arc Ionian Sea Fore-arc basin Lithospheric buckling Longshore current
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Sine cura. Verso il ri-ciclo dell'architettura del secondo Novecento

2019

Gli argomenti discussi nel saggio interrogano il destino che il Codice dei Beni Culturali (2004- 2011) determina per le opere del secondo Novecento. Nella costruzione del futuro di questi manufatti, che per funzione, tecnologia e cicli d’uso sono spesso segnati dall’obsolescenza e dall’abbandono, le ambiguità e le incongruenze delle attuali procedure legislative sollecitano profondamente il ruolo culturale delle esperienze di ricerca che usano metodologie meta progettuali. Il confronto fra alcuni casi italiani ed altri europei rimarca il ruolo del progetto nella costruzione di una prospettiva di tutela trasformativa per il costruito del secondo Novecento. Nel quadro di azione marcato dall’o…

Settore ICAR/14 - Composizione Architettonica E UrbanaThe essay questions the future's possibilities to operate on the buildings of the second half of the twentieth century according to the Italian Code of Cultural Heritage (2004-2011). When arguing how to encourage the re-use of these artifacts which are often marked by short-life technology cycles obsolescence and abandonment the ambiguities and inconsistencies of current legislative procedures deeply stress the cultural role of research experiences that use project-oriented methodologies. The comparison between some Italian and other European cases highlights the role of a design approach in the construction of a transformative protection perspective for the built matter of the second half of the twentieth century. In a framework aiming to encourage a reconciliation between the recent built environment and the new paradigms of sustainability and circular economy architecture must recognize re-cycle practices as a main theoretical and procedural node. To modernize the late Modern built environment with contemporary construction components is not simply a matter of technical knowledge and expertise: but a theme with theoretical density aesthetic and ethical values. The architectural project in this field today must ask for greater congruence between the bureaucratic and administrative levels and the real consistency of this corpus. It is a matter of identifying strategies to equip it with capabilities meanings and contents remembering that demolition wastes have unsustainable environmental costs and uncertain results concerning the necessary new attribution of political and semantic meaning that these places await.
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An improved five-parameter model for photovoltaic modules

2010

This paper presents a new five-parameter model capable of analytically describing the I–V characteristic of a photovoltaic module for each generic condition of operative temperature and solar irradiance. The parameters of the equivalent electrical circuit are extracted by solving a system of equations based on data commonly issued by manufacturers in standard rating conditions with a trial and error process. The procedure, which does not require any special equations solver, can be easily coded into a short software routine using simple languages and finds the solution of the system of equations with the desired accuracy without needing to be guided towards solutions starting from fitted in…

Settore ING-IND/11 - Fisica Tecnica AmbientaleOperating photovoltaic currentRenewable Energy Sustainability and the Environmentbusiness.industryComputer sciencePhotovoltaic systemVisual Basic for ApplicationsI–V characteristicSolverSystem of linear equationsTrial and errorOne-diode equivalent circuitSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionSoftwareSolar energyPhotovoltaic modulelawElectrical networkEquivalent circuitbusinessFive-parameter modelSimulationSolar Energy Materials and Solar Cells
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Off-line scan path planning for robotic NDT

2018

This work presents computer-aided scan path generation for robotic non-destructive testing of complex shaped test-pieces. Off-line programmed scan path was used to robotically inspect an aluminium fixed leading edge skin panel of an aircraft wing by means of swept frequency eddy currents method. Eddy currents probe was deployed by means of a six-axis robotic arm KUKA KR5 arc. Reverse engineering of the test-piece was carried out to reconstruct CAD model of its surface. Positioning accuracy of the performed continuous scan was measured with a laser tracker in accordance with ISO 9283:1998 and is reported in the paper. The positional uncertainty of the NDT scan calculated as the standard devi…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineEddy current NDTTKRoboticsReverse engineeringQCOff-line path planningPath accuracy
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Electrochemical fabrication of Cu2O/TiO2 nanotubes junctions with visible light photoactivity

2013

Settore ING-IND/23 - Chimica Fisica ApplicataElectrochemical fabrication Cu2O/TiO2 nanotubes junctions visible light photoactivity Photocurrent Spectroscopy Electrochemical Impedance Spectroscopy
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Photocurrent Spectroscopy in Corrosion and Passivity Studies. A Critical Assessment

2016

Photocurrent Spectroscopy (PCS) is currently employed for the characterization of solid-state properties of semiconducting and insulating materials, since the knowledge of their band gap is a prerequisite to any possible application in different fields such as: solar energy conversion (photoelectrochemical and photovoltaic solar cells, photocatalysis) and microelectronics (high-k, high band-gap materials) (1-2). In the last 20-30 years an increasing number of scientists working in the area of corrosion has been attracted by this technique owing to its versatility and ability to scrutinize in situ corrosion layers and passive films having semiconducting or insulating behaviour. In previous w…

Settore ING-IND/23 - Chimica Fisica ApplicataPhotocurrent Spectroscopy Corrosion Passivity
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Photoelectrochemical monitoring of rouging and de-rouging process on AISI 316L for chemical reactors

2016

The food and fine-chemical industry has for a long time been troubled by red brown to dark violet deposits in distillation columns, storage vessels and distribution systems for purified water and clean steam. Owing to the visual appearance of those deposits, the phenomena was referred as rouge. Although formation of rouge, i.e. rouging, is a commonly known phenomenon in stainless steel systems, the basic mechanism is still not fully understood. The phenomenon causes precipitation of iron as fine red-brown ferric oxide or hydroxide particles. Moreover adherent discoloration of the stainless steel surface is often observed in conjunction with the loosely adhered rouge particles. The affected …

Settore ING-IND/23 - Chimica Fisica ApplicataPhotocurrent Spectroscopy rouging de-rouging AISI 316L chemical reactors
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Physicochemical Characterization of anodic film on Titanium prepared by Pedeferri’s Treatment.

2013

Settore ING-IND/23 - Chimica Fisica ApplicataPhysicochemical Characterization Photocurrent Spectroscopy Electrochemical Impedance Spectroscopy anodic film Titanium Pedeferri’s Treatment.
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