Search results for "current"

showing 10 items of 2224 documents

Quasi *-algebras and generalized inductive limits of C*-algebras

2011

inductive limitJordan algebraGeneral MathematicsSubalgebraCurrent algebraUniversal enveloping algebraFiltered algebraAlgebraC*-algebrasSettore MAT/05 - Analisi MatematicaQuasi *-algebraAlgebra representationDivision algebraCellular algebraMathematics
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Theoretical study of neutrino scattering off the stable even Mo isotopes at low and intermediate energies

2011

A systematic study of the cross sections of neutral-current neutrino scattering off the stable even Mo isotopes (mass number A = 92, 94, 96, 98, 100), at low and intermediate neutrino energies (E(nu) <= 130 MeV), is presented and discussed. The required wave functions for the initial (ground state) and all accessible final nuclear states are constructed in the context of the quasi-particle random-phase approximation (QRPA) and tested against data on the low-lying energy spectra of the isotopes in question. The individual contributions coming from the polar-vector and axial-vector components of the hadronic current for the coherent and incoherent channels of each isotope are investigated. Th…

inelastic cross sectionsNuclear and High Energy PhysicsParticle physicsHadronsemi-leptonic electro-weak interactionsneutrino-nucleus reactionsnuclear-data sheetsNuclear physicsdedicated supernova detectionDouble beta decayelastic-scatteringNeutrino Ettore Majorana ObservatoryconversionNuclear ExperimentdetectorsPhysicsMass numberweak-interactionNeutral currentIsotopequasi-particle random-phase approximationspallationSupernovareaction cross-sectionsnetworkHigh Energy Physics::ExperimentNeutrinoburstNuclear Physics A
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Nanopore charge inversion and current-voltage curves in mixtures of asymmetric electrolytes

2018

[EN] We consider the screening of the negative charges (carboxylic acid groups) fixed on the surface of a conical-shaped track-etched nanopore by divalent magnesium (Mg2+) and trivalent lanthanum (La3+). The experimental current (I)-voltage (V) curves and current rectification ratios allow discussing fundamental questions about the overcompensation of spatially-fixed charges by multivalent ions over nanoscale volumes. The effects of charge inversion or reversal on nanopore transport are discussed in mixtures of asymmetric electrolytes (LaCl3 and MgCl2 with KCl). In particular, pore charge inversion is demonstrated for La3+ as well as for mixtures of this trivalent ion at low concentrations …

inorganic chemicalsCharged nanoporeMaterials scienceKineticschemistry.chemical_elementFiltration and Separation02 engineering and technologyElectrolyte010402 general chemistry01 natural sciencesBiochemistryDivalentIonLanthanumGeneral Materials SciencePhysical and Theoretical ChemistryMaterialsAsymmetric electrolyteschemistry.chemical_classificationCharge inversionNanotecnologiaCurrent rectification021001 nanoscience & nanotechnology0104 chemical sciencesNanoporeHysteresisMembranechemistryChemical physicsCurrent-voltage curveFISICA APLICADA0210 nano-technology
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Accelerated Light-Induced Defect Transformation Study of Elkem Solar Grade Silicon

2012

AbstractSolar cells made of silicon feedstock from a metallurgical route must qualify not only the initial efficiency, but must also be comparable to the solar cells made from reference polysilicon on the spectral response after light induced degradation. A detailed comparative study of light induced defects and its impact on cell performance is necessary for both materials. We have studied accelerated light induced degradation (ALID) defect transformation for Elkem Solar Silicon and polysilicon solar cells by selecting wafers from different positions from respective silicon bricks. Active boron-oxygen complexes and iron ions in multicrystalline silicon solar cells have been analyzed, and t…

inorganic chemicalsMaterials scienceSiliconintegumentary systembusiness.industrychemistry.chemical_elementSpectral responsefood and beveragescomplex mixturesMonocrystalline siliconCurrent voltagechemistryEnergy(all)Boron-Oxygen Complexesbiological sciencesLight inducedForensic engineeringAccelerated Light Induced DegradationOptoelectronicsDegradation (geology)WaferbusinessElkem Solar SiliconEnergy Procedia
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Metrological performances of voltage and current instrument transformers in harmonics measurements

2018

In the new electrical system scenario, the increasing presence of non-linear loads and renewable energy sources makes the measurement of harmonics an essential task. The accuracy of harmonic measurement firstly depends on the used instrument transformers for voltage and current sensing. Since the behavior of instrument transformers in non-sinusoidal conditions is not always well defined, this paper presents an experimental study on the metrological performances of current and voltage instrument transformers (CTs and VTs) in the presence of harmonics. Proper tests procedures are defined and measurement setups are developed for both CTs and VTs calibration. The analysis is carried out by usin…

instrument transformers020209 energy02 engineering and technologyInstrument TransformerHarmonic analysispower system meaurementsPhase AngleDistortionharmonics0202 electrical engineering electronic engineering information engineeringCalibrationElectronic engineeringMedicineSafety Risk Reliability and QualityInstrumentationbusiness.industry020208 electrical & electronic engineeringHarmonicPower System MeasurementcalibrationCurrent transformerMetrologyHarmonicsHarmonicbusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheVoltage
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Current transformers effects on the measurement of harmonic active power in LV and MV networks

2011

The harmonic active power is used to determine the location of polluting loads, the direction of harmonic power flow and to estimate how consequential a certain current harmonic source is. The highest uncertainties, when measuring harmonic active power, are introduced by the current and voltage transducers. This paper presents experimental results which show the impact of current transformers (CTs) on the accuracy of the harmonic power measurements. An expression for the evaluation of the power error in distorted conditions was developed which can be easily utilized in the case of linear current transducers. It is shown how CTs cannot be considered linear transducers and how the higher the …

instrument transformersEngineeringVoltage and current harmonicsSwitched-mode power supplyAcousticsActive powerTransducersEnergy Engineering and Power TechnologyLinear currentsPower factorHarmonic powerLinear transducersPower errorsPower transformersVoltage transducersHarmonic analysisHarmonic analysisMaximum valuesCurrent transformerElectrical and Electronic EngineeringPower measurementPhase anglesAbsolute valuesHarmonic power flowTotal harmonic distortionbusiness.industryElectric power distributionCurrent harmonicsElectrical engineeringAC powerCurrent transformerMV networksHarmonicsAccuracy classElectric instrument transformersHarmonicPower system harmonicsCurrent transformers (CTs) instrument transformerspower measurement power system harmonics.businessSettore ING-INF/07 - Misure Elettriche E Elettroniche
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Effective reference and current integration for large displacement interface

2016

The most common interface formulations proposed in literature are generally based on the restrictive hypothesis of small strains and small displacements and, even though their application to geometrically nonlinear problems is of paramount interest, only few contributions are available in literature. Motivations are probably due to the difficulties encountered on such formulation, as already mentioned by several authors. A pioneering formulation is the finite displacement three-dimensional interface developed by Ortiz and Pandolfi in [1], where normal and tangential traction components are evaluated with respect to the middle surface in the current configuration, producing a non-symmetric g…

interface large displacement symmetric formulation current integration reference integrationSettore ICAR/08 - Scienza Delle Costruzioni
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Intrinsic spin-orbit interaction in diffusive normal wire Josephson weak links: Supercurrent and density of states

2015

We study the effect of the intrinsic (Rashba or Dresselhaus) spin-orbit interaction in superconductor--nanowire--superconductor (SNS) weak links in the presence of a spin-splitting field that can result either from an intrinsic exchange field or the Zeeman effect of an applied field. We solve the full non-linear Usadel equations numerically and analyze the resulting supercurrent through the weak link and the behavior of the density of states in the center of the wire. We point out how the presence of the spin-orbit interaction gives rise to a long-range spin triplet supercurrent, which remains finite even in the limit of very large exchange fields. In particular, we show how rotating the fi…

intrinsic spin-orbit interactionField (physics)ta221Josephson weak linksFOS: Physical sciences02 engineering and technologysuperconductors01 natural sciencesSuperconductivity (cond-mat.supr-con)symbols.namesakeCondensed Matter::SuperconductivityQuantum mechanics0103 physical sciences010306 general physicssupercurrentSpin-½SuperconductivityPhysicsZeeman effectta114Condensed matter physicsCondensed Matter - SuperconductivitySupercurrentSpin–orbit interactionCondensed Matter::Mesoscopic Systems and Quantum Hall Effect021001 nanoscience & nanotechnologynanowiresPairingDensity of statessymbols0210 nano-technologyPhysical Review B
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Iodine Deficiency in Latvia: Current Status and Need for National Recommendations

2017

Abstract In the absence of a mandatory salt iodisation programme, two nationwide cross-sectional cluster surveys revealed persisting iodine deficiency among Latvian schoolchildren during the spring season and a noteworthy iodine deficiency in pregnant women in Latvia; these deficiencies warrant intervention. The consequences of mild-to-moderate iodine deficiency during pregnancy and lactation can adversely affect foetal brain development. Data from a Latvian population survey revealed the consumption of approximately 100 μg of iodine per day through foods and iodised salt. Therefore, strategies to increase the consumption of iodine-containing products should be implemented, particularly for…

iodine deficiencyPregnancyMultidisciplinaryGeneral interestScienceQiodine supplementationmedicine.diseaseIodine deficiencyIodine supplementationchildrenEnvironmental healthmedicinepregnancyCurrent (fluid)Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.
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Nuevas perspectivas de análisis para entender la migración cualificada del sur de Europa hacia México

2018

This article focuses on skilled migration flows from Southern Europe into Mexico. From semi-structured interviews with Spanish and Italian immigrants living in four Mexican cities of Mexico, it addresses both reasons for immigration and labour incorporation in Mexican labour markets. Specifically, it explores: i) the role of the economic crisis and the lack of good employment in the countries of origin as a key factor when deciding an international migration; ii) the employment opportunities offered in Mexican labour markets for the highly-skilled immigrants, and iii) the role played by the Mexican state and its current immigration law when channelling this group into the labour market

it addresses both reasons for immigration and labour incorporation in Mexican labour markets. Specificallymigración laboralSouthern Europecrisis económicaand iii) the role played by the Mexican state and its current immigration law when channelling this group into the labour market Migración cualificadaMéxicosur de EuropaOrtiz i Guitarteconomic crisislabour migration 55 66:SOCIOLOGÍA [UNESCO]Cristòbalit explores: i) the role of the economic crisis and the lack of good employment in the countries of origin as a key factor when deciding an international migrationSkilled migrationUNESCO::SOCIOLOGÍA1137-7038 8537 Arxius de sociologia 514142 2018 39 6874486 Nuevas perspectivas de análisis para entender la migración cualificada del sur de Europa hacia México Mendoza PérezOliveras GonzálezAnna This article focuses on skilled migration flows from Southern Europe into Mexico. From semi-structured interviews with Spanish and Italian immigrants living in four Mexican cities of MexicoXavierii) the employment opportunities offered in Mexican labour markets for the highly-skilled immigrantsMexicoi) the role of the economic crisis and the lack of good employment in the countries of origin as a key factor when deciding an international migration [it explores]
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