Search results for " Capa"

showing 10 items of 1248 documents

Palermo si cura. Pratiche culturali di mutuo soccorso come risposta alle fragilità della città (post)pandemica

2023

In un quadro di riferimento in cui la crisi è globalizzata ma diseguale e in mancanza di un sistema di welfare capace di rispondere alle urgenze dei contesti e dei gruppi sociali più marginalizzati, una risposta ai nuovi bisogni sociali ed individuali è stata offerta da reti solidali e da pratiche di mobilitazione dal basso che svolgono un ruolo di agency territoriale, spesso indipendentemente o in assenza di Istituzioni. Nel contesto palermitano un impegno agito da una pluralità di soggetti culturali già attivi sul territorio, riuniti in un’assemblea pubblica (Palermo si cura), durante il periodo del primo lockdown hanno dato vita ad azioni di mutuo soccorso per rispondere all’emergenza ec…

Settore ICAR/21 - UrbanisticaIn a framework in which the crisis is globalized but unequal and in the absence of a welfare system capable of responding to the urgencies of the most marginalized contexts and social groups a response to the new social and individual needs has been offered by networks of solidarity and from bottom-up mobilization practices that play a role of territorial agency often independently or in the absence of institutions. In the Palermo context a commitment made by a plurality of cultural subjects already active in the area gathered in a public assembly (Palermo si cura) during the period of the first lockdown gave rise to mutual aid actions to respond to the economic emergency and social and offer a proposal to cure the fragility of the city based not on charity but on the claim of a political dimension of collective action. Starting from the analysis of initiatives such as "Un sorriso per Ballarò" and "Abbiamo un (bi)sogno" the contribution analyzes the role the incidence and the fragility of these experiences in providing answers - often filling gaps - to a general interest and how these processes of value creation can hopefully contribute to the construction of local government policies capable of addressing emerging issues.
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Thermal Parameters Measurements of High-Rise Building Envelope

2016

In buildings, to ensure the thermal comfort of the occupants and to keep the energy consumption as low as possible, a correct design of the thermal system is necessary. To do so, an appropriate determination of the thermo-physical properties of the wall materials is needed, particularly; new light-weight building technologies are widely used in the construction of the building envelope. One of these parameters, particularly important in Mediterranean climatic dynamic conditions is the heat capacity, due to the presence of the sun’s energy contribution in hot and cold seasons. The value of the heat capacity in such like materials is typically quite different from the declared parameter, obta…

Settore ING-IND/11 - Fisica Tecnica AmbientaleLightweight walls Specific heat capacity Thermal transmittance High-Rise Building Cellulose loose-fill
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Energy and environmental benefits of circular economy strategies: The case study of reusing used batteries from electric vehicles

2019

Abstract According to recent literature and technical analyses, used batteries from electric vehicles can still be used, before the final treatment at the end-of-life, in stationary applications that are usually less stressing than the automotive ones. In this framework, a circular economy inspired pathway is emerging between the building and the transportation sector, generally called “second life” of batteries. Used batteries from electric vehicles can be re-used in residential buildings together with renewable electricity generation technologies to improve the matching between the highly variable electricity generation from renewables and the electricity demand in buildings. This study a…

Settore ING-IND/11 - Fisica Tecnica AmbientaleRenewable Energy Sustainability and the EnvironmentComputer sciencebusiness.industry020209 energyCircular economyAutomotive industryEnergy Engineering and Power Technology02 engineering and technologyReuseEnvironmental economics021001 nanoscience & nanotechnologyRenewable energyNameplate capacityElectricity generationSustainability0202 electrical engineering electronic engineering information engineeringElectricityBattery Second life Storage system Renewable electricity generation technologies Circular economy Life cycle assessment SustainabilityElectrical and Electronic Engineering0210 nano-technologybusinessJournal of Energy Storage
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CFRP STRUCTURAL CAPACITORS: EFFECT OF DAMAGE AND MECHANICAL LOAD ON CAPACITANCE

2013

Aim of this work is to study the effect of mechanical load and damages, on the performance of structural capacitors, made by CFRP composite laminates with a PET dielectric film (treated with sodium hydroxide) inserted at the laminate middle-plane. Such capacitors have been characterized by ILSS and tensile tests and the properties so estimated were compared to those of the simple CFRP. By measuring the capacitance before mechanical loading, under loading and after unloading, it has been observed that, due to the damage of the CFRP layers, proved also by proper fractographic analysis, at high strain level the capacitance decreases although it exhibits a complete recovery after unloading. Suc…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di Macchinesmart materialStructural capacitorlayered structurefree-edge stresses.
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The Effect of Anodizing Bath Composition on the Electronic Properties of Anodic Ta-Nb Mixed Oxides

2022

Anodic oxides were grown to 50 V on Ta-Nb sputtering deposited alloys, with high Nb content, in acetate ions containing an aqueous solution to study the effect of the anodizing bath composition on anodic layers’ dielectric properties. Photoelectrochemical measurements proved the presence of a photocurrent in the band gap of photon energy lower than oxides, due to optical transitions involving localized electronic states as a consequence of acetate ions incorporation. Flat band potential value estimates assessed the insulating nature of the anodic oxides grown in the acetate buffer solution. Differential capacitance measurements showed that the highest capacitance value was measured for the …

Settore ING-IND/23 - Chimica Fisica ApplicataNb oxide Ta oxide anodizing capacitance electrolytic capacitors mixed oxidesGeneral Chemical Engineeringanodizing; capacitance; electrolytic capacitors; mixed oxides; Ta oxide; Nb oxideGeneral Materials ScienceNanomaterials; Volume 12; Issue 24; Pages: 4439
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Physico-chemical Characterization of Aluminium Oxide Films Grown on Etched Foils for Electrolytic Capacitors

2012

Settore ING-IND/23 - Chimica Fisica ApplicataPhysico-chemical CharacterizationAluminium Oxide FilmElectrolytic Capacitors
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Performance of Nanostructured Electrode in Lead Acid Battery

2015

Lead acid batteries have a large number of potential advantages, but the high weight of lead limits their use in new technologies, like hybrid or electrical cars, which require light batteries with high specific energy. We tried to overtake this limit with nanostructured electrodes of PbO2 and Pb, obtained by electrodeposition in polycarbonate template. In the case of lead, to obtain electrodes with very good mechanical stability, a systematic investigation of electrodeposition process was needed to overcome the formation of dendrites that is the principal limitation of electrochemical production of metal lead. Nanostructured electrodes were tested in a zero gap configuration, using commerc…

Settore ING-IND/23 - Chimica Fisica Applicatalcsh:Computer engineering. Computer hardwareLead-acid battery nano structured electrodes high capacity high C-ratelcsh:TP155-156lcsh:TK7885-7895lcsh:Chemical engineeringChemical Engineering Transactions
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Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniFree Space Optics (FSO) technologies for satellite communications offer several advantages: wide bandwidth high rate capability immunity to electromagnetic interference and small equipment size. Thus they are suitable for inter-satellite links deep space communications and also for high data rate ground-to-satellite/satellite-to-ground communications. Nevertheless FSO links suffer impairments that cause power signal degradation at the receiver. Scattering and absorption cause power signal attenuations predictable by suitable deterministic models. Optical turbulence causes random irradiance fluctuations which can generate signal fading events and can thereby only be predicted by statistical models. Attenuation and fading events can corrupt FSO links and so it would be recommended to add mitigation error codes on the communication link. FSO channel can be described as an erasure channel: fading events can cause erasure errors. We have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding on the source data that allows the receiver to recover the whole payload despite erasure errors. We implemented two different of rateless codes: Luby Transform (LT) and Raptor. We analyzed their performances on a simulated turbulent GEO FSO downlink (1 Gbps - OOK modulation) at a 106 μm wavelength and for different values of zenith angles. Assuming a plane-wave propagation and employing Hufnagel-Valley we modeled the downlink using: 1) a temporal correlated channel model based on Gamma-Gamma probability distribution and 2) an irradiance covariance function that we converted on a time function using Taylor frozen eddies hypothesis. Our new channel model is able to simulate irradiance fluctuations at different turbulence conditions as it will be shown in the full paper. We will also report performance results of LT and Raptor codes at overhead range varying between 0 and 50% and for different values of source packets.Settore ING-INF/01 - Elettronica
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I contratti del minore

2017

L’indagine si propone di risolvere il quesito relativo alla validità o no dei contratti di modico valore conclusi dal minore nella vita quotidiana. Si tenterà di comprendere se essi siano sempre annullabili ex art. 1425 del codice civile italiano, fatta eccezione per l’ipotesi contemplata dall’art. 1426 c.c.; oppure se siano validi, o perché il minore viene considerato nuncius – o, se capace di intendere e di volere, rappresentante volontario – di uno o di entrambi i genitori oppure per applicazione analogica dell’art. 409, comma 2, c.c. Particolare attenzione sarà dedicata ai problemi sollevati all’interprete dai contratti conclusi in via telematica dal minore e alle principali questioni d…

Settore IUS/01 - Diritto Privatocontratti del minore atti patrimoniali del minore capacità di agire
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Pandemia e assunzioni nelle Pubbliche Amministrazioni

2022

Le norme legate all’emergenza epidemiologica e all’attuazione del Piano Nazionale di Ripresa e Resilienza (PNRR) prevedono il reclutamento di almeno 40.835 nuove unità, di cui 23.011 a tempo determinato e 490 nuove posizioni dirigenziali, oltre ad incarichi di esperti pari a 8,5 milioni di euro per ciascuno degli anni dal 2022 al 2026. La spesa complessiva di questa operazione è stimata in circa 5,443 miliardi di euro. Il PNRR rappresenta, quindi, un’occasione unica di reclutamento dopo oltre un decennio di blocco del turn over, da non sprecare. Il piano straordinario di assunzione connesso al PNRR, infatti, va ad interagire e a sovrapporsi in prospettiva con il piano ordinario di reclutame…

Settore IUS/09 - Istituzioni Di Diritto PubblicoPiano nazionale di ripresa e resilienza capacità amministrativa reclutamento di personale concorso pubblico
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