Search results for "AIC"

showing 10 items of 2470 documents

Dual attachment pairs in categorically-algebraic topology

2011

[EN] The paper is a continuation of our study on developing a new approach to (lattice-valued) topological structures, which relies on category theory and universal algebra, and which is called categorically-algebraic (catalg) topology. The new framework is used to build a topological setting, based in a catalg extension of the set-theoretic membership relation "e" called dual attachment, thereby dualizing the notion of attachment introduced by the authors earlier. Following the recent interest of the fuzzy community in topological systems of S. Vickers, we clarify completely relationships between these structures and (dual) attachment, showing that unlike the former, the latter have no inh…

(pre)image operatorWeak topologyTopological algebralcsh:Mathematicslcsh:QA299.6-433Quasi-framelcsh:AnalysisTopological spacelcsh:QA1-939Topological vector spaceHomeomorphismAlgebraDual attachment pair(LM)-fuzzy topologyTrivial topologyCategory of topological spacesVarietyGeometry and TopologyGeneral topology(lattice-valued) categorically-algebraic topologyTopological systemQuasi-coincidence relationSpatialization(localic) algebraMathematics
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Hard cap espresso extraction and liquid chromatography determination of bioactive compounds in vegetables and spices

2017

Abstract A new analytical procedure, based on liquid chromatography with diode array and fluorescence detection, has been proposed for the determination of bioactive compounds in vegetables and spices after hard cap espresso extraction. This novel extraction system has been tested for the determination of capsaicin and dihydrocapsaicin from fresh chilli and sweet pepper, piperine from ground pepper, curcumin from turmeric and curry, and myristicin from nutmeg. Extraction efficiency was evaluated by using acetonitrile:water and ethanol:water mixtures. The proposed method allows the extraction of samples with 100 mL of 60% (v/v) ethanol in water. The obtained limits of quantification for the …

01 natural sciencesMyristicaAnalytical ChemistryDihydrocapsaicinchemistry.chemical_compoundEspresso0404 agricultural biotechnologyVegetablesPepperSpicesChromatographybiologyChemistry010401 analytical chemistryExtraction (chemistry)Nutmeg04 agricultural and veterinary sciencesGeneral Medicinebiology.organism_classification040401 food scienceDiode array0104 chemical sciencesMyristicinPiperineCapsicumChromatography LiquidFood ScienceFood Chemistry
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Une structure o-minimale sans décomposition cellulaire

2008

Resume Nous construisons une extension o-minimale du corps des nombres reels qui n'admet pas la propriete de decomposition cellulaire en classe C ∞ . Pour citer cet article : O. Le Gal, J.-P. Rolin, C. R. Acad. Sci. Paris, Ser. I 346 (2008).

010101 applied mathematicsCombinatorics010102 general mathematicsCell structureGeneral MedicineDecomposition method (constraint satisfaction)0101 mathematicsAlgebraic number field01 natural sciencesMathematicsComptes Rendus Mathematique
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Codimension growth of central polynomials of Lie algebras

2019

Abstract Let L be a finite-dimensional simple Lie algebra over an algebraically closed field of characteristic zero and let I be the T-ideal of polynomial identities of the adjoint representation of L. We prove that the number of multilinear central polynomials in n variables, linearly independent modulo I, grows exponentially like ( dim ⁡ L ) n {(\dim L)^{n}} .

010101 applied mathematicsPure mathematicsExponential growthApplied MathematicsGeneral MathematicsComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION010102 general mathematicsLie algebraCodimension0101 mathematics01 natural sciencesMathematicsForum Mathematicum
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p −1-Linear Maps in Algebra and Geometry

2012

At least since Habousch’s proof of Kempf’s vanishing theorem, Frobenius splitting techniques have played a crucial role in geometric representation theory and algebraic geometry over a field of positive characteristic. In this article we survey some recent developments which grew out of the confluence of Frobenius splitting techniques and tight closure theory and which provide a framework for higher dimension geometry in positive characteristic. We focus on local properties, i.e. singularities, test ideals, and local cohomology on the one hand and global geometric applicatioms to vanishing theorems and lifting of sections on the other.

010102 general mathematicsFrobenius splittingField (mathematics)Algebraic geometryLocal cohomology01 natural sciencesCoherent sheafAlgebraLine bundle0103 physical sciencesGravitational singularity010307 mathematical physics0101 mathematicsTight closureMathematics
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Numerical Procedures and their Practical Application in PV Module Analyses. Part IV: Atmospheric Transparency Parameters - Application

2020

Abstract The presented article relates to aspects of PV module testing using natural sunlight in outdoor conditions. It is a continuation of the article Part III: parameters of atmospheric transparency - determining and correlations. This article discusses the practical application of the indexes: atmosphere purity - k Tm , diffused component content - k s/o , beam clear sky index - K b - in testing various modules in outdoor conditions. Their influence on the conversion of modules made from various absorbers and various technologies is demonstrated. Their practical application in module testing in outdoor conditions is described and it - has been demonstrated that the results of the analys…

010302 applied physicsChemistrybusiness.industry020209 energysolar energyAtmospheric transparencysolar radiation spectrum02 engineering and technologysky clearness indexdiffused component content index01 natural sciencesEnergy engineeringPart iiiphotovoltaicsComponent (UML)0103 physical sciences0202 electrical engineering electronic engineering information engineeringGeneral Materials ScienceProcess engineeringbusinessEcological Chemistry and Engineering S
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Photovoltaics: solar energy resources and the possibility of their use

2016

Abstract In this paper possibilities and limits of use of solar energy (like the best efficiencies of PV cells, world records and ‘notable exceptions’) were shown. Also some new ideas and concepts in photovoltaics (like new photovoltaic power plants or energy storage) were presented. Additionally authors try to predict development of solar power industry.

010302 applied physicsEnvironmental EngineeringChemistrybusiness.industryEcology (disciplines)Photovoltaic system02 engineering and technology021001 nanoscience & nanotechnologySolar energy01 natural sciencesEnergy engineeringEngineering physicsPhotovoltaic thermal hybrid solar collectorPhotovoltaics0103 physical sciencesEnvironmental ChemistryBuilding-integrated photovoltaics0210 nano-technologybusinessEcological Chemistry and Engineering S
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SIC based solid state protections switches for space applications

2017

Development and technology maturation of Silicon Carbide (SiC) power transistors over the last 15 years has motivated its study in aerospace systems. When compared with Si devices, superior voltage blocking capacity and the capability of operation at higher temperatures, give important advantages in space power electronics applications, similar to what happens in terrestrial electronics. This paper discusses the use of SiC power transistors for Solid State Power Switches especially addressed to the space segment. Two applications will be covered, the first is the Solid State Shunt Switch, widely used in high power Direct Energy Transfer (DET) photovoltaic power regulators and the second is …

010302 applied physicsMaterials science010308 nuclear & particles physicsbusiness.industryPhotovoltaic systemTransistorElectrical engineeringHigh voltage01 natural scienceslaw.inventionchemistry.chemical_compoundchemistrylawPower electronics0103 physical sciencesSilicon carbidePower semiconductor deviceElectronicsbusinessVoltage2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)
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Fabrication and characterization of low cost Cu 2 O/ZnO:Al solar cells for sustainable photovoltaics with earth abundant materials

2016

Abstract The low cost electrodeposition method was used to grow Cu2O thin films and experimentally determine the optimal absorber layer thickness. Raman scattering studies indicate the presence of solely crystalline Cu2O and SEM images show that the thin films consist of grains with a pyramidal shape. The influence of the thickness of the light absorbing Cu2O layer on the basic characteristic of the heterojunction and their properties have been investigated using reflectivity, current–voltage (J–V), capacitance–voltage (C–V) and the external quantum efficiency (EQE) measurements. The depletion layer, the charge collection length of the minority carrier, and reflectivity are the main factors…

010302 applied physicsMaterials scienceRenewable Energy Sustainability and the Environmentbusiness.industryOpen-circuit voltageHeterojunction02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialslaw.inventionOpticsDepletion regionlawPhotovoltaics0103 physical sciencesSolar cellOptoelectronicsQuantum efficiencyThin film0210 nano-technologybusinessShort circuitSolar Energy Materials and Solar Cells
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Temperature Dependent Suns-V<inf>oc</inf> of Multicrystalline Silicon Solar Cells from Different Ingot Positions

2018

This paper presents temperature dependent Suns- Voc measurements on multicrystalline silicon cells originating from different ingot positions. The effective lifetime is found to increase for all cells when the temperature is increased from 25°C to 6°C. However, cells from the top of the ingot show a considerably larger increas 40–50% for illumination conditions of 0.1-1 Sun, compared to an increase of 20-30% observed for cells from the bottom. The decrease in Voc with increasing temperature is found to be lower for cells from the top of the ingot compared to cells from the bottom. The temperature coefficient of the Voc is found to vary 5% along the ingot at 1 Sun, highlighting the influence…

010302 applied physicsMaterials scienceSiliconbusiness.industry020209 energyPhotovoltaic systemchemistry.chemical_element02 engineering and technologySuns in alchemy01 natural sciencesTemperature measurementchemistry0103 physical sciences0202 electrical engineering electronic engineering information engineeringOptoelectronicsIngotbusinessTemperature coefficientSensitivity (electronics)2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)
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