Conclusiones Mesa 1. XIV Jornadas de Redes de Investigación en Docencia Universitaria (2016)

El objetivo de este trabajo es el de resumir las comunicaciones orales correspondientes a la Mesa de Comunicaciones 1, que fueron presentadas en las XIV Jornadas de Redes de Investigación en Docencia Universitaria celebradas el 30 de junio y el 1 de julio de 2016 en la Universidad de Alicante. Dichas jornadas tituladas “Investigación, innovación y enseñanza universitaria: enfoques pluridisciplinares,” fueron organizadas por el Instituto de Ciencias de la Educación de dicha universidad. En esta Mesa de Comunicaciones 1 celebrada el 30 de junio fueron expuestos nueve trabajos por autores de la Universidad de Alicante. Los temas tratados cubrieron diferentes temáticas educativas, desde nuevos métodos de enseñanza impulsando los recursos multimodales, la investigación como método educativo, enseñanza a través de códigos QR, actividades realizadas dentro del Plan de Acción Tutorial, repositorios como ayuda para el estudiante a la hora de buscar información en Internet o la utilización de concursos como herramienta para impulsar la creatividad y el aprendizaje del estudiante

Desarrollo de software en Comproductive Control y Matlab para asignaturas de Control en Ingeniería Química

El principal objetivo de este trabajo es implementar programas de software utilizando CC (Comproductive Control) y Matlab que permita a los estudiantes comprender los conceptos químicos de control y que así tengan la capacidad de interpretar los cálculos y desarrollar las matemáticas propias de las asignaturas de control de procesos químicos. El CC es un programa que utiliza unos comandos muy similares a la notación que los estudiantes manejan en las clases de teoría y, por tanto, no requiere un conocimiento previo de programación para poder utilizarlo. Además, a pesar de su sencillez, permite estudiar las técnicas básicas para el control de procesos industriales. Sin embargo, el CC tiene sus limitaciones ya que solamente es capaz de simular el control de los procesos químicos más sencillos. Por este motivo, otro de los programas con los que se pretende que el estudiante se familiarice es el Matlab. Este programa está más orientado al desarrollo de algoritmos con los cuales se pueden simular el control de procesos químicos más complejos. Por tanto, el CC y el Matlab son dos programas que se complementan mutuamente para el aprendizaje del estudiante en la materia

Comparison of peristrophic multiplexing and a combination of angular and peristrophic holographic multiplexing in a thick PVA/acrylamide photopolymer for data storage

Two different types of multiplexing are used to store 90 holograms at the same location in a polyvinyl alcoholacrylamide photopolymer material. In the first, the 90 holograms are stored using only peristrophic multiplexing, whereas in the second a combination of angular and peristrophic multiplexing is used. The results (diffraction efficiency and dynamic range, M#) obtained with these two multiplexing techniques are compared. With the first, the dynamic range was M# = 13 and with the second M# = 8. An exposure schedule method is used to calculate the exposure time necessary to store the holograms with a more uniform, higher diffraction efficiency.This work was supported by the “Ministerio de Educación y Ciencia (Spain)” under projects FIS2005-05881-C02-01 and FIS2005-05881-C02-02, and by the “Generalitat Valenciana” under Project GV06/172

Influence of 4,4’-azobis (4-cyanopentanoic acid) in Transmission and Reflection Gratings Stored in a PVA/AA Photopolymer

Holographic transmission gratings with a spatial frequency of 2658 lines/mm and reflection gratings with a spatial frequency of 4553 lines/mm were stored in a polyvinyl alcohol (PVA)/acrylamide (AA) based photopolymer. This material can reach diffraction efficiencies close to 100% for spatial frequencies about 1000 lines/mm. However, for higher spatial frequencies, the diffraction efficiency decreases considerably as the spatial frequency increases. To enhance the material response at high spatial frequencies, a chain transfer agent, the 4,4’-azobis (4-cyanopentanoic acid), ACPA, is added to the composition of the material. Different concentrations of ACPA are incorporated into the main composition of the photopolymer to find the concentration value that provides the highest diffraction efficiency. Moreover, the refractive index modulation and the optical thickness of the transmission and reflection gratings were obtained, evaluated and compared to procure more information about the influence of the ACPA on them.This work was supported by the “Generalitat Valenciana” (Spain) under projects PROMETEOII/2015/015 and ISIC/2012/013 and by “Ministerio de Ciencia e Innovación” (Spain) under projects FIS2014-56100-C2-1-P and FIS2015-66570-P

Influencia del ACPA en la resolución y estabilidad de redes holográficas almacenadas en fotopolímeros basados en PVA/Acrilamida

Este trabajo presenta los resultados obtenidos después de almacenar redes holográficas por transmisión con una frecuencia espacial de 2663 líneas/mm, en un material basado en PVA/AA. A la composición del material se le ha incorporado un agente acortador de cadenas para mejorar su resolución espacial. Además, se ha aplicado un proceso de curado a las redes almacenadas para fijar el rendimiento en difracción y que no disminuya con el paso del tiempo.Este trabajo ha sido subvencionado por el Ministerio de Economía y Competitividad (proyectos FIS2011-29803-C02-01 y FIS2011-29803-C02-02), por la Generalitat Valenciana (proyecto PROMETEO/2011/021) y por la Universidad de Alicante (proyecto GRE09-10)

Study of influence of ACPA in PVA/AA photopolymer for holographic reflection gratings

This work pretends to optimize the standard composition of the PVA/Acrylamide photopolymer, changing its composition in order to improve its spatial resolution. To do this, a chain transfer agent, 4,4'-azobis (4-cyanopentanoic acid) (ACPA) was introduced in the photopolymer and its concentration was modified. Thus, the optimal concentration which gets obtain the maximum diffraction efficiency for high spatial frequencies was found. To quantify the improvement that occurs with the inclusion of the ACPA in the PVA/Acrylamide photopolymer, holographic reflexion gratings of 4553 lines/mm were stored. Moreover, diffraction efficiency obtained with the different concentrations of ACPA was measured to compare the obtained results.This work was supported by the “Generalitat Valenciana” (Spain) under project PROMETEO/2011/021, ISIC/2012/013 and GV/2012/099 and by “Ministerio de Ciencia e Innovación” (Spain) under projects FIS2011-29803-C02-01 and FIS2011-29803-C02-02

Binary Intensity Modulation and Hybrid Ternary Modulation Applied to Multiplexing Objects Using Holographic Data Storage on a PVA/AA Photopolymer

Holographic data pages were multiplexed in a polyvinyl alcohol/acrylamide photopolymer and a liquid crystal device was used to modify the object beam and store objects in the material. A peristrophic multiplexing method was used to store a large number of objects in the same spot of the material. The objects were stored using two different modulations: binary intensity modulation and hybrid ternary modulation. Moreover, the bit error rate (BER) of the images was calculated in order to compare which modulation is most appropriate to be used for holographic data storage.This work was supported by the “Generalitat Valenciana” (Spain) under Projects PROMETEO/2011/021 and ISIC/2012/013 and by “Ministerio de Ciencia e Innovación” (Spain) under Projects FIS2011-29803-C02-01 and FIS2011-29803-C02-02

Estimation of the virial coefficients by means of chaotic oscillations of pressure and density: Application to quantum gases with cubic equations of state

This paper analyzes how to determine the virial coefficients B and C of real gases by using a theoretical device whose pressures and densities oscillate in chaotic regime. The device is formed by a valve, a pressure controller, a pressure probe and a gas accumulator, for which the thermodynamic model has been derived from the force-mass-energy balances. This model allows keeping the gas temperature almost constant with chaotic oscillations in the inlet to the accumulator. The chaotic data are used to obtain variability in the pressures and densities, so that they can be used as experimental values from which the virial coefficients are estimated. For this purpose, several cubic and high precision equations of state for polar and non-polar gases and mixtures are used. In particular, the virial coefficient B for dry air is estimated by using high precision state equations, whereas, the virial coefficients B and C are also estimated for quantum gases (He4, He3 H2, D2, Ne) by using several modified cubic equations of state at moderate and high pressures. Furthermore, the values for the virial coefficient B obtained from numerical simulations are used to estimate the intermolecular potential and the radial distribution function. The results are in good agreement with the currently known experimental data for virial coefficients published in the literature

Optimization of a thick polyvinyl alcohol-acrylamide photopolymer for data storage using a combination of angular and peristrophic holographic multiplexing

The capability of polyvinyl alcohol-acrylamide photopolymer materials to obtain angularly multiplexed holographic gratings has been demonstrated [Appl. Phys. B 76, 851 (2003)]. A combination of two multiplexing methods -peristrophic and angular multiplexing- is used to record 60 holograms. An exposure schedule method is used to optimize the capability of the photopolymerizable holographic material and obtain holograms with a higher, more uniform diffraction efficiency. In addition, because of this exposure schedule method, the entire dynamic range (M#) of the material will be exploited, obtaining values of approximately M#∼9 in layers approximately 800 μm thick.This work was supported by the “Ministerio de Educación y Ciencia (Spain)” under projects FIS2005-05881-C02-01 and FIS2005-05881-C02-02, and by the University of Alicante (Spain) under Project GRE 04-06

Accurate control of a liquid-crystal display to produce a homogenized Fourier transform for holographic memories

We show an accurate procedure to obtain a Fourier transform (FT) with no dc term using a commercial twisted-nematic liquid-crystal display. We focus on the application to holographic storage of binary data pages, where a drastic decrease of the dc term in the FT is highly desirable. Two different codification schemes are considered: binary π radians phase modulation and hybrid ternary modulation. Any deviation in the values of the amplitude and phase shift generates the appearance of a strong dc term. Experimental results confirm that the calculated configurations provide a FT with no dc term, thus showing the effectiveness of the proposal.This work was supported by the “Ministerio de Educación y Ciencia (Spain)” under projects FIS2005-05881-C02-01 and FIS2005-05881-C02-02, and by the “Generalitat Valenciana” under Project GV06/007