STUDY OF THE NUTRITION OF CHILDREN AGED 6 YEARS IN CONDITIONS OF SEMIBOARDING-SCHOOL OF EDUCATION

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COMPARATIVE STUDY OF SOME HAEMATOLOGICAL AND BIOCHEMICAL PARAMETERS OF PUPILS FROM TECHNICAL GRAMMAR SCHOOL OF WOODWORKING

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Surface relief model for photopolymers without cover plating

Relief surface changes provide interesting possibilities for storing diffractive optical elements on photopolymers and are an important source of information to characterize and understand the material behaviour. In this paper we present a 3-dimensional model based on direct measurements of parameters to predict the relief structures generated on the material. This model is successfully applied to different photopolymers with different values of monomer diffusion. The importance of monomer diffusion in depth is also discussed.This work was supported by the Ministerio de Ciencia e Innovación of Spain under projects FIS2008-05856-C02-01 and FIS2008-05856-C02-02 and by the Generalitat Valenciana of Spain under project PROMETEO/2011/021

Modelling Two-Dimensional Photopolymer Patterns Produced With Multiple-Beam Holography

Periodic structures referred to as photonic crystals attract considerable interest due to their potential applications in areas such as nanotechnology, photonics, plasmonics, etc. Among various techniques used for their fabrication, multiple-beam holography is a promising method enabling defect-free structures to be produced in a single step over large areas. In this paper we use a mathematical model describing photopolymerisation to simulate two-dimensional structures produced by the interference pattern of three noncoplanar beams. The holographic recording of different lattices is studied by variation of certain parameters such as beam wave vectors, time and intensity of illumination

Optical and sensing properties of sol-gel derived vanadium pentoxide thin films with porous and dense structures

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Optical properties of photopolymerizable nanocomposites containing nanosized molecular sieves

International audienceAcrylamide-based photopolymerizable nanocomposites containing three types of nanosized crystals with controlled microporosity, Silicalite-1 (MFI-structure), AlPO-18 (AEI-structure) and Beta (BEA-structure) are studied. The influence of the porous nanoparticles on the average refractive index, optical scattering and holographic recording properties of the nanocomposite are characterized. The redistribution of nanoparticles as a result of the holographic recording in the layers is investigated by Raman spectroscopy. It is observed that in all three nanocomposites the nanoparticles are redistributed according to the illuminating light pattern. This redistribution improves the refractive index modulation only in the case of the MFI nanoparticles, while no improvement is observed in AEI and BEA doped layers. The results can be explained by the hydrophobic/hydrophilic nature of the nanoparticles and their interactions, or absence of interactions, with the host photopolymer