Search results for "modules"

showing 10 items of 68 documents

Hardware implementation of content based video indexing algorithms

2005

This paper focus on hardware implementation of content based video indexing techniques by using the FPGA technology. We aim to propose hardware modules that can satisfy requirements of constrained applications, such as real time applications and complex applications that can combine a large number of techniques in the same indexing system. We represent tow examples of micro-architectures related to the dominant colors descriptor and the compact color descriptor.

Focus (computing)Hardware modulesbusiness.industryComputer scienceContent (measure theory)Search engine indexingComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONbusinessField-programmable gate arrayComputer hardwareMicroarchitectureContent based retrieval2005 12th IEEE International Conference on Electronics, Circuits and Systems
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External derivations of internal groupoids

2008

If His a G-crossed module, the set of derivations of Gin H is a monoid under the Whitehead product of derivations. We interpret the Whitehead product using the correspondence between crossed modules and internal groupoids in the category of groups. Working in the general context of internal groupoids in a finitely complete category, we relate derivations to holomorphisms, translations, affine transformations, and to the embedding category of a groupoid. (C) 2007 Elsevier B.V. All rights reserved.

Higher-dimensional algebraAlgebra and Number TheoryComplete categoryCategory of groupsContext (language use)derivations crossed modules internal groupoids holomorphismsAlgebraSettore MAT/02 - AlgebraMathematics::K-Theory and HomologyMathematics::Category TheoryMonoid (category theory)EmbeddingAffine transformationMathematics::Symplectic GeometryMathematicsWhitehead productJournal of Pure and Applied Algebra
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Assessment of the Usability and Accuracy of Two-Diode Models for Photovoltaic Modules

2017

Many diode-based equivalent circuits for simulating the electrical behaviour of photovoltaic (PV) cells and panels are reported in the scientific literature. Two-diode equivalent circuits, which require more complex procedures to calculate the seven model parameters, are less numerous. The model parameters are generally calculated using the data extracted from the datasheets issued by the PV panel manufactures and adopting simplifying hypotheses and numerical solving techniques. A criterion for rating both the usability and accuracy of two-diode models is proposed in this paper with the aim of supporting researchers and designers, working in the area of PV systems, to select and use a model…

I-V characteristicEngineeringControl and Optimization020209 energyEnergy Engineering and Power TechnologyModel parameters02 engineering and technologySolar irradianceTwo-diode equivalent circuitSolar energyphotovoltaic modules; two-diode equivalent circuit; I-V characteristics; solar energy0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringEngineering (miscellaneous)SimulationDiodeSettore ING-IND/11 - Fisica Tecnica AmbientaleRenewable Energy Sustainability and the Environmentbusiness.industryComputer Science (all)Photovoltaic systemUsabilityI-V characteristics; Photovoltaic modules; Solar energy; Two-diode equivalent circuit; Computer Science (all)Power (physics)Photovoltaic moduleEquivalent circuitbusinessConstant (mathematics)Energy (miscellaneous)Energies
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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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Kronecker modules and reductions of a pair of bilinear forms

2004

We give a short overview on the subject of canonical reduction of a pair of bilinear forms, each being symmetric or alternating, making use of the classification of pairs of linear mappings between vector spaces given by J. Dieudonné.

Kronecker modules bilinear forms.Settore MAT/04 - Matematiche Complementari
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Energy evaluation and life cycle assessment of an innovative building integrated technology: the smart window-luminescent solar concentrator

2022

Luminescent Solar Concentrators (LSC) represent one of the innovative and potentially most versatile technologies related to Building Integrated Photovoltaics (BIPV). The peculiarity of these devices lies in the fact that they can be integrated into the surface of the building to replace openings such as skylights or windows, thanks to their characteristic of being semi-transparent and of functioning both with direct and diffused radiation. Eni developed the own technology Eni Ray Plus® based on LSC and integrated it in a multifunctional smart window-LSC (SW-LSC) prototype. The device uses the energy produced by LSC modules to power an autonomous and passive shading system, exploiting irrad…

Life cycle assessmentLuminescent solar concentratorSettore ING-IND/11 - Fisica Tecnica AmbientaleSmart windowPhotovoltaic modules
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Detailed balance analysis of area de-coupled double tandem photovoltaic modules

2015

Published version of an article in the journal: Applied Physics Letters. Also available from the publisher at: http://dx.doi.org/10.1063/1.4906602 This paper describes how layers of area de-coupled top and bottom cells in photovoltaic tandem modules can increase the efficiency of two-terminal tandem devices. The point of the area de-coupling is to allow the number of top cells to differ from the number of bottom cells. Within each of the layers, the cells can be horizontally series-connected and the layers can then be currentor voltage-matched with each other in a tandem module. Using detailed balance modeling, it is shown that two-terminal tandem modules of this type can achieve the same t…

Materials sciencePhysics and Astronomy (miscellaneous)SiliconTandembusiness.industryBand gapPhotovoltaic systemVDP::Technology: 500chemistry.chemical_elementDetailed balancechemistryOptoelectronicsPoint (geometry)Layer (object-oriented design)businessphotovoltaic cells modules couplingResolution (algebra)
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Dynamic programming and Munkres algorithm for optimal photovoltaic arrays reconfiguration

2015

Abstract In this paper, an original formulation of the control problem for optimal PV array reconfiguration, following a Total Cross Tied layout, is proposed. The formulation follows the well-known subset sum problem, which is a special case of the knapsack problem. The reconfiguration is a measure devoted to mitigate the mismatch effect and maximize the output power of small photovoltaic plants under non-homogeneous working conditions. Therefore, reconfiguration means changing the connections of the solar panels adaptively by a dynamic switching matrix. The control system implements an easy dynamic programming algorithm to change the switches layout. The use of the Munkres assignment metho…

Mathematical optimizationRenewable Energy Sustainability and the EnvironmentComputer sciencePhotovoltaic systemMismatch Photovoltaic modules Optimization Reconfiguration.Control reconfigurationPower (physics)Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaDynamic programmingSettore ING-IND/31 - ElettrotecnicaHungarian algorithmKnapsack problemControl systemSubset sum problemGeneral Materials ScienceSolar Energy
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Novel GaN Based Solid State Power Amplifiers, Results, Advances and Comparison with Vacuum Tubes Based Microwave Power Modules

2018

Power amplifiers based on vacuum tubes or solid state are key items in a number of systems. Solid state technology is growing up for some applications and it may be complementary to the vacuum technology. This paperwork presents SSPA operational principles and performance. The GaN technology available in the market, the technology roadmap, a comparison with the vacuum tubes are introduced

Microwave Power modulesMaterials scienceComputingMilieux_THECOMPUTINGPROFESSIONAmplifierVacuum tubeGallium nitrideSettore ING-INF/01 - ElettronicaEngineering physicsGeneralLiterature_MISCELLANEOUSlaw.inventionPower (physics)chemistry.chemical_compoundElectricity generationchemistrylawInsertion lossPower Amplifier: Solid state circuitTechnology roadmapRadio frequencyMicrowave TubeComputingMethodologies_COMPUTERGRAPHICS2018 IEEE 4th International Forum on Research and Technology for Society and Industry (RTSI)
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