Search results for "Volt"

showing 10 items of 2187 documents

A Criterion for Rating the Usability and Accuracy of the One-Diode Models for Photovoltaic Modules

2016

In selecting a mathematical model for simulating physical behaviours, it is important to reach an acceptable compromise between analytical complexity and achievable precision. With the aim of helping researchers and designers working in the area of photovoltaic systems to make a choice among the numerous diode-based models, a criterion for rating both the usability and accuracy of one-diode models is proposed in this paper. A three-level rating scale, which considers the ease of finding the data used by the analytical procedure, the simplicity of the mathematical tools needed to perform calculations and the accuracy achieved in calculating the current and power, is used. The proposed criter…

I-V characteristicsEngineeringI-V characteristicControl and Optimization020209 energysolar energyEnergy Engineering and Power Technology02 engineering and technologySolar irradiancelcsh:TechnologyRating scale0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringEngineering (miscellaneous)SimulationPhotovoltaic modules; one-diode equivalent circuit; five-parameter model; I-V characteristics; solar energySettore ING-IND/11 - Fisica Tecnica Ambientalephotovoltaic modulesRenewable Energy Sustainability and the Environmentbusiness.industrylcsh:Tphotovoltaic modules; one-diode equivalent circuit; five-parameter model; <i>I-V</i> characteristics; solar energyPhotovoltaic systemUsability021001 nanoscience & nanotechnologySolar energyone-diode equivalent circuitPower (physics)Photovoltaic moduleEquivalent circuitfive-parameter model0210 nano-technologybusinessConstant (mathematics)Energy (miscellaneous)Energies; Volume 9; Issue 6; Pages: 427
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Assessment of the Usability and Accuracy of the Simplified One-Diode Models for Photovoltaic Modules

2016

Models for photovoltaic (PV) cells and panels, based on the diode equivalent circuit, have been widely used because they are effective tools for system design. Many authors have presented simplified one-diode models whose three or four parameters are calculated using the data extracted from the datasheets issued by PV panel manufactures and adopting some simplifying hypotheses and numerical solving techniques. Sometimes it may be difficult to make a choice among so many models. To help researchers and designers working in the area of photovoltaic systems in selecting the model that is fit for purpose, a criterion for rating both the usability and accuracy of simplified one-diode models is p…

I-V characteristicsI-V characteristicEngineeringControl and Optimization020209 energyEnergy Engineering and Power Technology02 engineering and technologySolar irradiancelcsh:TechnologySolar energy0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringEngineering (miscellaneous)Three-parameter modelFour-parameter modelSimulationDiodephotovoltaic modulesSettore ING-IND/11 - Fisica Tecnica Ambientalelcsh:TRenewable Energy Sustainability and the Environmentbusiness.industryPhotovoltaic systemUsabilitySolar energyOne-diode equivalent circuitReliability engineeringPhotovoltaic modulephotovoltaic modules; one-diode equivalent circuit; three-parameter model; four-parameter model; <i>I-V</i> characteristics; solar energySystems designEquivalent circuitbusinessConstant (mathematics)Energy (miscellaneous)Energies
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A Highly Luminescent Nitrogen-Doped Nanographene as an Acid- and Metal-Sensitive Fluorophore for Optical Imaging.

2021

Dibenzo[hi,st]ovalene (DBOV) has excellent photophysical properties, including strong fluorescence and high ambient stability. Moreover, the optical blinking properties of DBOV have enabled optical super-resolution single-molecule localization microscopy with an imaging resolution beyond the diffraction limit. Various organic and inorganic fluorescent probes have been developed for super-resolution imaging, but those sensitive to pH and/or metal ions have remained elusive. Here, we report a diaza-derivative of DBOV (N-DBOV), synthesized in eight steps with a total yield of 15%. Nitrogen (N)-bearing zigzag edges were formed through oxidative cyclization of amino groups in the last step. UV-v…

IONSFluorophoreNitrogenMetal ions in aqueous solutionIronOvalenePhotochemistryOXIDATIONBiochemistryCatalysisFluorescence spectroscopyArticlechemistry.chemical_compoundColloid and Surface ChemistryMicroscopyFLUORESCENCEFluorescent DyesCONSTRUCTIONMolecular StructureChemistryDERIVATIVESWARPED NANOGRAPHENEGeneral ChemistryFluorescenceNanostructuresLuminescent MeasurementsCHEMOSENSORGraphiteN-HETEROCYCLESCyclic voltammetryAQUEOUS-MEDIUMLuminescenceSYSTEMCopperJournal of the American Chemical Society
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Polymer/metal hybrid multilayers modified Schottky devices

2013

Insulating, polymethylmethacrylate (PMMA), and semiconducting, poly(3-hexylthiophene) (P3HT), nanometer thick polymers/Au nanoparticles based hybrid multilayers (HyMLs) were fabricated on p-Si single-crystal substrate. An iterative method, which involves, respectively, spin-coating (PMMA and P3HT deposition) and sputtering (Au nanoparticles deposition) techniques to prepare Au/HyMLs/p-Si Schottky device, was used. The barrier height and the ideality factor of the Au/HyMLs/p-Si Schottky devices were investigated by current-voltage measurements in the thickness range of 1-5 bilayers. It was observed that the barrier height of such hybrid layered systems can be tuned as a function of bilayers …

Ideality factorMaterials sciencePhysics and Astronomy (miscellaneous)Layered systemNanoparticleSilicon GoldNanotechnologySingle-crystal substrates DepositionSubstrate (electronics)Poly-3-hexylthiopheneSettore ING-INF/01 - ElettronicaSettore FIS/03 - Fisica Della MateriaNanoparticleSputteringPolymer; Au nanoparticles; Schottky devicePolymerHybrid multilayerConductive polymerSpin coatingbusiness.industryBarrier heightSchottky diodeSputter depositionCurrent-voltage measurementSemiconducting siliconSchottky deviceOptoelectronicsSelf-assemblybusinessAu nanoparticles
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Centri storici manomessi: “antichi” come nuovi!

2012

The chapter presents the results of urban planning in Italy since 1950 and introduces the theories developed by Muratori and Caniggia for the restoration of historical centers. The paper critically shows some examples of typological restoration and introduces the debate that has developed around the outcomes of interventions.

Il capitolo espone criticamente gli esiti della pianificazione urbanistica in Italia dal 1950 ad oggi e introduce le teorie elaborate da Muratori e Caniggia per il recupero dei centri storici. Il saggio richiama alcuni esempi di restauro tipologico e introduce il dibattito che si è sviluppato intorno agli esiti degli interventi con una particolare attenzione rivolta al trattamento delle superfici architetoniche.Settore ICAR/19 - Restauro
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Liberalizing Industrial Relations in Southern-Europe: Towards the End of a Coordinated and Egalitarian Model

2016

The paper focuses on the changes that occurred to the architecture of industrial relations in Southern-European countries during the last decade. In particular, the bargaining systems of Italy, France, Spain, Greece and Portugal are compared, with a particular attention to the legislative measures enacted under the influence of international institutions after the 2008 financial and sovereign debt crisis. The theoretical framework, under which the process of transformation is analysed, is the literature on comparative politics as recently reviewed by Thelen. At the same time, the work takes into account the labour law dogmatic category of "inderogability", represented by the couple law-bran…

Il presente lavoro analizza i cambiamenti nell'architettura delle relazioni industriali in Europa del Sud durante l'ultimo decennio. Al riguardo vengono comparati i sistemi di contrattazione collettiva di Italia Francia Spagna Grecia e Portogallo con particolare attenzione ai provvedimenti legislativi emanati dietro influenza delle istituzioni internazionali dopo la crisi finanziaria e del debito sovrano del 2008. Il contesto teorico di riferimento è rappresentato dalla letteratura in materia di politica comparata come di recente rivista da Thelen. Nel contempo l’analisi è svolta alla luce della categoria giuslavoristica di “norma inderogabile” costituita dal binomio legge-contratto collettivo nazionale figlio dei trente glorieuses. Tale architettura delle relazioni industriali è stata fortemente erosa dal rafforzamento della capacità derogatoria degli accordi aziendali. Pertanto attraverso l'uso di una comparazione multidisciplinare l'articolo dimostra che le nazioni oggetto di studio stanno transitando da un contesto di elevata regolazione verso una comune traiettoria “neo-liberale” vista la crescente asimmetria di potere tra lavoro e capitale in favore del secondo.Settore IUS/07 - Diritto Del Lavoro
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Impatto ambientale dei pannelli fotovoltaici

2012

Impatto ambientale fotovoltaico fonti rinnovabili
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Identification of vegetal species in wooden objects using in situ microextraction-assisted voltammetry of microparticles

2017

[EN] A method for identifying vegetal species in wooden objects using microextraction-assisted voltammetry of microparticles is described. The proposed methodology, aimed at facilitating tasks of patrimony conservation, is based on the recording of the voltammetric response of microparticulate films of compounds resulting from microextraction with organic solvents (ethanol, acetone, and chloroform) of micro- or sub-microsamples of wood in contact with aqueous buffers. Upon application of bivariate and multivariate chemometric techniques, the obtained voltammetric responses led us to identify different taxonomic groups from the characteristic voltammetric profiles. Application to a series of…

In situChromatographyChemistryGeneral Chemical Engineering010401 analytical chemistryGeneral EngineeringAnalytical chemistry02 engineering and technology021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesAnalytical ChemistryPINTURA0210 nano-technologyVoltammetry
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Extension of the potential intervals of high redox activity and electronic conductivity of polypyrrole films on electrode surface via their electroch…

2021

Abstract Thin polypyrrole films (thickness: about 30 nm) have been deposited at electrode surface via potentiostatic oxidation of dilute (1 mM) pyrrole solution in acetonitrile (AN). It has been shown that their subsequent treatment by means of multi-cycle voltammetry within a broad potential range (up to -2.0 V vs. Ag/Ag+ in AN) leads to their "activation", i.e. to a very strong extension of their redox response region in the negative direction as well as to almost uniform distribution of the redox activity within this potential range. Region of their high conductivity under in situ conditions has also extended significantly. Spectral and electrocatalytic properties of such PPy films befor…

In situMaterials scienceGeneral Chemical EngineeringAnalytical chemistryElectrochemistryPolypyrroleRedoxchemistry.chemical_compoundMonomerchemistryPolymerizationElectrodeElectrochemistryVoltammetryElectrochimica Acta
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Integrazione di celle solari di terza generazione nel vetromattone per la realizzazione di pannelli traslucidi fotovoltaici. Analisi prestazione e st…

2013

L’articolo illustra i primi risultati ottenuti nell’ambito dell’analisi prestazionale del vetromattone fotovoltaico, un prodotto edilizio innovativo derivato dall’integrazione di celle fotovoltaiche di terza generazione (DSSC) nel vetromattone, ideato per la realizzazione di involucri traslucidi energeticamente effi cienti ed “attivi”, in grado di ridurre i consumi energetici degli edifi ci e di produrre, al contempo, energia verde. L’analisi è stata condotta su quattro differenti ipotesi di integrazione. Attraverso simulazioni numeriche si è effettuata una valutazione dell’energia assorbita dagli strati attivi oltre che delle prestazioni ottiche complessive del dispositivo. Lo studio anali…

In this article the fi rst results of the performance analysis of the photovoltaic glassblock are given. The photovoltaic glassblock is an innovative product which integrates third generation solar cells (DSSC) invented for the construction of translucent building envelopes energetically effi cient and “active” able to reduce the energy consumption in buildings and to produce at the same time green energy. The analysis was conducted on four different hypotheses of integration through numerical simulations in order to evaluate the energy absorption and the optical performance of the device. The software simulations represent a fi rst step for the understanding of the performance of the element and prelude to an experimental analysis session. The results of a research conducted about national and international patents publications on the DSSC technology and its applications will be illustrated too. The data collected during this research had been organized in a digital database.Settore ICAR/10 - Architettura Tecnica
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