Search results for "current"

showing 10 items of 2224 documents

Sea Wave Energy. A Review of the Current Technologies and Perspectives

2021

The proposal of new technologies capable of producing electrical energy from renewable sources has driven research into seas and oceans. Research finds this field very promising in the future of renewable energies, especially in areas where there are specific climatic and morphological characteristics to exploit large amounts of energy from the sea. In general, this kind of energy is referred to as six energy resources: waves, tidal range, tidal current, ocean current, ocean thermal energy conversion, and saline gradient. This review has the aim to list several wave-energy converter power plants and to analyze their years of operation. In this way, a focus is created to understand how many …

TechnologyControl and OptimizationTidal rangeOcean thermal energy conversionEmerging technologiesAttenuator OD OWC Point absorber Sea wave Terminator WAB WECterminatorEnergy Engineering and Power TechnologyattenuatorPhysics::GeophysicsOWCpoint absorberElectrical and Electronic Engineeringsea waveEngineering (miscellaneous)Physics::Atmospheric and Oceanic PhysicsSettore ING-IND/11 - Fisica Tecnica AmbientaleRenewable Energy Sustainability and the Environmentbusiness.industryTElectric potential energyOcean currentWECRenewable energyCurrent (stream)Work (electrical)Environmental sciencebusinessEnergy (miscellaneous)Marine engineeringEnergies
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Graphene Field-Effect Transistors Employing Different Thin Oxide Films: A Comparative Study

2019

In this work, we report on a comparison among graphene field-effect transistors (GFETs) employing different dielectrics as gate layers to evaluate their microwave response. In particular, aluminum oxide (Al$_{2}$O$_{3}$), titanium oxide (TiO$_{2}$), and hafnium oxide (HfO$_{2}$) have been tested. GFETs have been fabricated on a single chip and a statistical analysis has been performed on a set of 24 devices for each type of oxide. Direct current and microwave measurements have been carried out on such GFETs and short circuit current gain and maximum available gain have been chosen as quality factors to evaluate their microwave performance. Our results show that all of the devices belonging …

TechnologyMaterials scienceGeneral Chemical EngineeringOxide02 engineering and technologyDielectricSettore ING-INF/01 - Elettronica7. Clean energy01 natural sciencesArticlelaw.inventionlcsh:Chemistrychemistry.chemical_compoundlawGraphene Field-Effect Transistors Microwaves Oxide Films0103 physical sciences010302 applied physicsbusiness.industryGrapheneDirect currentTransistorGeneral Chemistry021001 nanoscience & nanotechnologyTitanium oxidelcsh:QD1-999chemistry2018-020-021849ALDOptoelectronicsGraphene0210 nano-technologybusinessddc:600Short circuitMicrowaveACS Omega
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Large Area Deposition by Radio Frequency Sputtering of Gd0.1Ce0.9O1.95 Buffer Layers in Solid Oxide Fuel Cells: Structural, Morphological and Electro…

2021

We investigate the influence of position, under large circular sputtering targets, on the final electrochemical performance of 35 mm diameter button solid oxide fuel cells with sputter-deposited Gadolinium doped Ceria barrier layers, positioned in order to almost cover the entirety of the area associated with a 120 × 80 mm2 industrial cell. We compare the results obtained via structural and morphological analysis to the Electrochemical Impedance Spectroscopy (EIS) measurements performed on the button cells, disentangling the role of different parameters. The Atomic Force Microscopy analysis makes it possible to observe a decrease in the roughness values from the peripheral to the central zo…

TechnologyMaterials scienceScanning electron microscopeEnergy-dispersive X-ray spectroscopyOxideAnalytical chemistrySurface finishArticleimpedentiometric characterizationchemistry.chemical_compoundsputtered buffer layer morphologySputteringGeneral Materials Sciencelarge area depositionGadolinium-doped ceriaMicroscopyQC120-168.85TQH201-278.5Engineering (General). Civil engineering (General)Dielectric spectroscopyTK1-9971chemistryDescriptive and experimental mechanicsElectrical engineering. Electronics. Nuclear engineeringsputteringTA1-2040Current densityImpedentiometric characterization; Large area deposition; Sputtered buffer layer morphology; SputteringMaterials
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Optical quenching and recovery of photoconductivity in single-crystal diamond

2017

We study the photocurrent induced by pulsed-light illumination (pulse duration is several nanoseconds) of single-crystal diamond containing nitrogen impurities. Application of additional continuous-wave light of the same wavelength quenches pulsed photocurrent. Characterization of the optically quenched photocurrent and its recovery is important for the development of diamond based electronics and sensing. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license. This work was supported by AFOSR and the DARPA QuASAR program, by NSF Grant No. ECCS-1202258, and by DFG through the DIP program (FO 703/2-1).

TechnologyPhysics and Astronomy (miscellaneous)FOS: Physical sciencesPhysics::Optics02 engineering and technologyengineering.material01 natural sciencesEngineeringOpticsImpuritycond-mat.mes-hall0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)010306 general physicsApplied PhysicsPhotocurrentPhysicsQuenchingCondensed Matter - Mesoscale and Nanoscale Physicsbusiness.industryCondensed Matter::OtherPhotoconductivityDiamondPulse durationQuantum PhysicsNanosecond021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall EffectWavelengthPhysical SciencesengineeringOptoelectronicsphysics.optics0210 nano-technologybusinessOptics (physics.optics)Physics - Optics
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Temperature controller for brain slice chambers using a current sink output stage.

1985

Temperature controlMaterials scienceBiomedical EngineeringTemperatureBrainHuman physiologyEquipment DesignThermostatHippocampusComputer Science Applicationslaw.inventionRatsSlice preparationlawControl theoryAnimalsStage (hydrology)Current (fluid)Sink (computing)Medicalbiological engineeringcomputing
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La recente riforma della disciplina italiana del subappalto nella prospettiva del bid rigging

2023

L’articolo analizza in chiave critica la disciplina nazionale del subappalto nell’ambito delle gare pubbliche, così come recentemente riformata a seguito di diversi interventi normativi in ottemperanza alla procedura d’infrazione avviata dalla Commissione UE. Stando alla tesi dell’A., l’attuale quadro normativo – caratterizzato dalla quasi totale eliminazione delle limitazioni previgenti (probabilmente anche spingendosi oltre ciò che la Commissione UE ha richiesto) – difetta nel trovare un equo bilanciamento tra il principio della massima partecipazione alla gara, da un lato, e l’esigenza di prevenire e svelare potenziali condotte collusive, dall’altro. La suddetta conclusione, peraltro, ap…

The article critically analyzes the Italian regulation of subcontracting in the context of public tenders as recently amended by several legislative measures in compliance with the infringement procedure launched by the European Commission against Italy. According to the Author’s view the current legislative framework – characterized by the almost overall elimination of the previous limits (probably even going beyond what the European Commission requested) – lacks in finding a fair balance between the principle of the maximum participation in the tender on the one hand and the need to prevent and reveal potential collusive conduct on the other. Furthermore this conclusion is supported by the analysis of the regulation of the causes of exclusion from the tender still too timid in envisaging the optional exclusion of the participants due to anticompetitive conduct.
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La Seconda Vita dell'Ambiente Costruito

2021

Il contributo inquadra i saggi, gli studi, le ricerche e progetti pubblicati sul numero 9 di AGATHÓN su ‘La Seconda Vita dell’Ambiente Costruito’, tema di interesse per il mondo accademico, delle professioni e dell’industria. Cambiamenti climatici, eccessivo consumo di suolo e di risorse non rinnovabili, produzione sempre crescente di rifiuti, emergenza pandemica e crisi socio-economica globale sono entrati di fatto nel nostro quotidiano: seppur drammatiche, per certi versi, tali questioni possono essere colte come un’opportunità per ripensare il modo e il mondo in cui viviamo. In questo contesto di ‘rivoluzione’(Floridi, 2020) e di ‘policrisi’ (Losasso, 2020), e con riferimento specifico a…

The contribution frames the essays studies research and projects published in issue 9 of AGATHÓN on ‘The SecondLife of the Built Environment’ an interesting topic for universities businesses and industry. Climate changes excessive use of soil renewable resources ever-increasing production of waste the current pandemic emergency and the global socio-economic crisis have in fact entered our daily life. Even if these are tragic issues they can be somehow seized as an opportunity to rethink the way we live and our world. In this ‘revolutionary’ (Floridi 2020) and ‘polycrisis’ (Losasso 2020) context specifically referring to the building industry the Academy the Research and Industry worlds are called to give answers – based on sustainability and the principles of the Green Deal but also and mostly of the new Bauhaus – that can encourage reconsiderations and re-orientations of processes and products new projects on places buildings objects and materials able to positively affect the governance of the global change that our planet and humanity need able to give a ‘new life’ to the built and/or transformed environment at any scaleSettore ICAR/12 - Tecnologia Dell'Architettura
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Design e narrazioni

2022

Il testo nasce dall’esigenza di mettere a fuoco le implicazioni cognitive, metodologiche e progettuali del concetto di narrazione, sempre più ricorrente nella nostra esperienza quotidiana soprattutto per le molteplici forme di comunicazione e di produzioni culturali che vi si ispirano; si tratta di un concetto che anche nella riflessione teorica e nella progettualità del design sta alimentando dimensioni fortemente innovative ed evolutive nella costruzione, comunicazione di significati, contenuti immateriali, esperienze e valori emozionali che si sovrappongono e s’intrecciano all’espressione tangibile e funzionale degli oggetti, degli artefatti comunicativi, degli spazi. Si propone un perco…

The text arises from the need to focus on the cognitive methodological and design implications of the concept of storytelling increasingly recurrent in our daily experience especially for the many forms of communication and cultural productions that are inspired by itSettore ICAR/13 - Disegno Industrialeit is a concept that also in theoretical reflection and design planning is feeding strongly innovative and evolutionary dimensions in the construction communication of meanings intangible content experiences and emotional values that overlap and intertwine with the tangible and functional expression of objects communicative artifacts spaces.. It proposes a cognitive path tangent to the development of "narratology" and the theories of narrationthus we come across a multiplicity of disciplinary connections affecting sociology psychology anthropology philosophy semiotics and of course history cinema journalism advertising up to corporate communication and political propaganda. It is an articulated panorama that today seems to expand more and more and far from being mainly addressed to theoretical issues increasingly seems to be modeled on application performative and design aspects.
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Diffusive neural network

2002

Abstract A non-connectionist model of a neuronal network based on passive diffusion of neurotransmitters is presented as an alternative to hard-wired artificial neural networks. Classic thermodynamical approach shows that the diffusive network is capable of exhibiting asymptotic stability and a dynamics resembling that of a chaotic system. Basic computational capabilities of the net are discussed based on the equivalence with a Turing machine. The model offers a way to represent mass-sustained brain functions in terms of recurrent behaviors in the phase space.

Theoretical computer scienceQuantitative Biology::Neurons and CognitionArtificial neural networkComputer scienceCognitive NeuroscienceChaoticTopologyComputer Science ApplicationsTuring machinesymbols.namesakeRecurrent neural networkExponential stabilityArtificial IntelligencePhase spacesymbolsBiological neural networkStochastic neural networkNeurocomputing
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Una storia italiana: Giorgio e Isabella

2018

Si tratta, qui, della storia di due italiani dalla “pelle scura” raccontata, per Giorgio Marincola, da Carlo Costa e Lorenzo Teodonio in Razza partigiana e, per la sorella Isabella, da Wu Ming 2 e Antar Mohamed in Timira. Romanzo meticcio. Le loro vicende, così come molti altri aspetti della nostra storia coloniale, neocoloniale e postcoloniale, sono riemerse dal buio nel quale erano state occultate solo nell’ultimo quindicennio, grazie alla riapertura degli archivi che ha permesso di ridiscutere molti degli aspetti che nelle pagine di Storia, così come in quelle letterarie, erano stati raccontati in altro modo. I due testi, che hanno inevitabilmente finito per incontrarsi e che potremmo in…

This paper focuses on the story of two dark-skinned Italians written for Giorgio Marincola by Carlo Costa and Lorenzo Teodonio in Razza partigiana and for his sister Isabella by Wu Ming 2 and Antar Mohamed in Timira. Romanzo meticcio. The events of their lives as well as many other aspects of our colonial neocolonial and postcolonial history have re-emerged from the darkness in which they had been hidden only in the last fifteen years thanks to the reopening of the archives allowing to re-discuss many of the aspects that in the pages of History as well as in those of literature had been told in another way. The two works that could be inserted into the current defined as the "new Italian epic" dismantle a series of clichés and prejudices and invite us to reflect on the concept of Italian identity on colonialism and its consequence in the short and long term and particularly on racism.Settore L-FIL-LET/14 - Critica Letteraria E Letterature Comparate
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