91 research outputs found

    Floridi: información y filosofía

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    En Este Trabajo Se Pretende Profundizar En La Filosofía De La Información Comodisciplina Académica Y En Particular En La Visión Que Tiene Luciano Floridisobre Ella. Se Estudia El Alcance, La Definición Y Los Problemas Abiertos Queconforman El Núcleo De Dicha Corriente Y Se Dan Ciertas Orientaciones Paracomprender Bien El Concepto Primitivo De Información Como Noción Omnipresente Enla Sociedad De Las Tecnologías De La Información Y La Comunicación.This Contribution Intends To Deepen Into The Philosophy Of Information, Inparticular, Into Luciano Floridi S Stance. The Scope, A Definition, And Someopen Problems That Comprise This Discipline Core Are Studied. Some Orientationsto Understand The Primitive Conception Of Information As A Pervasive Notion Inthe Information Society We Live In Is Given

    Spectral classification of worldwide locations using SMR indexes

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    Spectral variation of solar irradiance can be analyzed by the means of component cells, being useful for multi junction (MJ) and concentrator photovoltaics (CPV) characterization by the use of component cells derived spectral indexes, namely, spectral matching ratios (SMRs). When enough spectral data is available, a location can be also characterized and a MJ solar cell can be locally tuned. The AERONET network of ground-based sun photometers is employed to obtain the atmosphere parameters for 34 sites worldwide. To conclude, the SMR indexes are obtained for every location, and a comparative analysis is completed for four architectures of MJ solar cells technologies (two lattice match and two metamorphic). Based on this information, some cluster of locations that share similar spectral features arise

    Evaluation of misalignments within a concentrator photovoltaic module by the module optical analyzer: a case of study concerning temperature effects on the module performance

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    Instituto de Energía Solar, Universidad Politécnica de Madrid (IES-UPM) has developed a method [referred to as the luminescence inverse (LI) method] and equipment [called module optical analyzer (MOA)] to fast measure the optical-angular properties of a CPV module without illumination system nor module movement. This paper presents how the MOA can investigate the optical performance of concentrator photovoltaic (CPV) modules optical-angular performance (in particular, misalignments between the optical components comprising the module) at different temperature conditions

    A novel achromatic Fresnel lens for high concentrating photovoltaic systems

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    In this paper we present a novel manufacturing method to produce achromatic Fresnel lenses for photovoltaic application. These achromatic lenses are capable of reaching a concentration factor three times higher than that attained by a conventional Silicone-on-Glass (SOG) Fresnel lens. The manufacturing method presented to fabricate the achromatic lens, which we refer to as Achromatic Doublet on Glass (ADG) Fresnel lens, is simple, cost-effective and highly scalable. A comprehensive ray-tracing analysis and its comparison with experimental results is presented in this work

    Fitting approach to liquid–liquid displacement porosimetry based on the log-normal pore size distribution

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    Producción CientíficaLiquid-liquid displacement porosimetry (LLDP) has been used to characterize several UF membranes in a wide range of molecular weight cut-offs (MWCO). A new method to convert porosimetric data into pore size distributions and related information has been developed based on assuming log-normal pore size distributions. The results of this are in good agreement with those from the customary data conversion algorithm (as derived by Grabar and Nikitine). The proposed method can also be used when a reduced number of experimental data points is available, leading to a significant reduction of data acquisition time needed to complete a reliable analysis.Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA302U13

    Power rating based on two different spectroheliometers with lattice-matched (LM) and upright metamorphic (UMM) component solar cells

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    Synthetic and empirical data have been used to explore the influence of spectral mismatch between MJ cell technologies on outdoor CPV module rating uncertainty. Calibration biases are attenuated by tightly filtering spectral conditions to a spectral matching ratio (SMR) of 1 ± 2.5%. The sensitivity of calibrated current to spectral deviations greatly depends on the direction and distribution of the deviations on the SMR space

    Characterizing CPV in a Lattice Mismarched World

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    In this work, we discuss difficulties we have faced while characterizing non-LM-Ge based CPV modules at the Instituto de Energía Solar, including: 1. For MJ cells with a 1eV bottom, bottom sub-cells may be current matched to the other two cells at reference spectrum. 2.In the case of metamorphic sells, with lower bandgaps in the middle cell, we find that certain spectral artifacts that previously had little influence on the middle cell (and therefore on ratio of JTop to JMid) are now more important

    Design and modeling of a cost-effective achromatic Fresnel lens for concentrating photovoltaics

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    This paper presents a novel Fresnel lens capable to significantly reduce chromatic aberration in solar applications. The optical performance of this achromatic lens has been analyzed through ray-tracing simulations, showing a concentration factor three times higher than that attained by a classic Silicone On Glass (SOG) Fresnel lens while maintaining the same acceptance angle. This should avoid the need for a secondary optical element, reducing the cost associated with its manufacturing and assembly and increasing the module reliability. The achromatic lens is made of inexpensive plastic and elastomer which allows a highly scalable and cost-competitive manufacturing process similar to the one currently used for the fabrication of SOG Fresnel lenses. (C)2016 Optical Society of Americ
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