Las colaboraciones empresariales y los tipos de socios tecnológicos

Mi trabajo consiste en una parte teórica que explica la evolución y la relevancia de las colaboraciones tecnológicas entre empresas, y una parte empírica donde, a partir de tablas y gráficas analizamos las variables que suponen una relevancia significativa a la hora de colaborar entre empresas. Por último realizamos nuestras propias conclusiones acerca de los resultados obtenidos en las tablas y gráficas.<br /

Obtención de ácidos grasos a partir de biomasa microalgal cultivada bajo diferentes condiciones de iluminación

It is considered that microalgae fatty acids have the potential to be used as raw material for the production of biofuels such as biodiesel or food supplements. The experimental treatment consisted in the exposure of the microalgae to different light color and photoperiod. For each treatment, microalgae Chlorella sp was cultivated from a 0.5 ml inoculum and escalated to 5 liters; the growth speed of the microalgae was determined, and the composition of fatty acids of one of the treatments was established. The treatment of red light under a photoperiod of twelve hours of light and twelve of dark showed the highest growth rate of 2.339 cells/day; the fatty acids obtained showed an important quantity of oleic acid, indicating a strong potential of the microalgae biomass for its use in alimentary industry.Se considera que los ácidos grasos provenientes de la biomasa microalgal tienen el potencial de ser utilizados como materia prima para la producción de biocombustibles como el biodiesel o para suplementos alimenticios. El tratamiento experimental consistió en cultivar las microalgas bajo diferentes parámetros de luz, incluidos el fotoperiodo y la longitud de onda. Para cada tratamiento, se cultivó la microalga Chlorella sp desde 0.5 ml y se escaló hasta 5 litros; se determinó la velocidad decrecimiento de cada microalga, y la composición de ácidos grasos de uno de los tratamientos fue establecida. El tratamiento de luz roja bajo un fotoperiodo de doce horas luz y doce horas oscuridad presentó la mayor tasa de crecimiento de 2.339 células/día;los ácidos grasos obtenidos mostraron una importante cantidad de ácido oleico, indicando un fuerte potencial de la biomasa de las microalgas paraser utilizadas en la industria alimentici

Path Planner for Autonomous Exploration of Underground Mines by Aerial Vehicles

[EN] This paper presents a path planner solution that makes it possible to autonomously explore underground mines with aerial robots (typically multicopters). In these environments the operations may be limited by many factors like the lack of external navigation signals, the narrow passages and the absence of radio communications. The designed path planner is defined as a simple and highly computationally efficient algorithm that, only relying on a laser imaging detection and ranging (LIDAR) sensor with Simultaneous localization and mapping (SLAM) capability, permits the exploration of a set of single-level mining tunnels. It performs dynamic planning based on exploration vectors, a novel variant of the open sector method with reinforced filtering. The algorithm incorporates global awareness and obstacle avoidance modules. The first one prevents the possibility of getting trapped in a loop, whereas the second one facilitates the navigation along narrow tunnels. The performance of the proposed solution has been tested in different study cases with a Hardware-in-the-loop (HIL) simulator developed for this purpose. In all situations the path planner logic performed as expected and the used routing was optimal. Furthermore, the path efficiency, measured in terms of traveled distance and used time, was high when compared with an ideal reference case. The result is a very fast, real-time, and static memory capable algorithm, which implemented on the proposed architecture presents a feasible solution for the autonomous exploration of underground mines.SIThis work has been possible thanks to the support of TELICE COMET to the Aerospace Research Group of the Universidad de León through different research contracts

Diseño estructural y comparación económica de una vivienda unifamiliar en el sistema de albañilería confinada y acervo liviano en la ciudad de Trujillo

Esta tesis investiga en qué medida el uso de un sistema de acero liviano influye en el costo y comportamiento sísmico de una vivienda unifamiliar a comparación del sistema de albañilería confinada, con la finalidad de proporcionar a la población Trujillana un nuevo método de construcción para sus viviendas. El diseño estructural de Steel Framing carece de aceptación a nivel local por la falta de información, sin embargo, se ha ido introduciendo en el mercado nacional mostrándose como un sistema constructivo más eficaz, con mejor comportamiento estructural y a un costo menor comparado con los diversos sistemas constructivos existentes. Se realizó una comparación tanto económica como estructural con el sistema de albañilería confinada, por ser uno de los primeros seleccionados al momento de construir una vivienda, esto determinará si el sistema de acero liviano puede reemplazar al sistema más usado a nivel local. Después de realizar el diseño estructural y el presupuesto de ambos sistemas mencionados se pudo determinar que el sistema de acero liviano tiene un óptimo comportamiento sísmico y resultó un 21% más económico que el sistema de Albañilería Confinada.This thesis investigates the extent to which the use of a light steel system influences the cost and seismic behavior of a single-family house compared to a confined masonry system, with the aim of providing the Trujillo population with a new method of construction for their houses. The structural design of Steel Framing lacks acceptance at a local level due to the lack of information. However, it has been introduced in the national market as a more efficient construction system, with better structural performance and at a lower cost compared to the various existing construction systems. An economic and structural comparison was made with the confined masonry system, being one of the first selected when building a house. This will determine if the light steel system can replace the most used system at the local level. After carrying out the structural design and budget of both systems mentioned above, it could be determined that the light steel system has an optimal seismic behavior and was 21% cheaper than the Confined Masonry system.Tesi

Synthesis of TiO2/Nanozeolite Composites for Highly Efficient Photocatalytic Oxidation of Propene in the Gas Phase

In this work, we reported the preparation of composites based on titania (TiO2) and Zeolite Socony Mobil-5 (ZSM-5) nanozeolite, following two approaches (i.e., incorporating the presynthesized zeolite in the synthesis medium of TiO2 and incorporating presynthesized TiO2 in the synthesis medium of ZSM-5). The materials synthesized were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), nitrogen adsorption, X-ray photoelectron spectroscopy (XPS), ultraviolet–visible spectroscopy (UV–vis), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) spectrometry analysis, and their photocatalytic activities were assessed in the oxidation of propene in the gas phase. It was observed that the synthesis methodology affects the final properties of the composite, which ultimately affected their photocatalytic performance in the studied application. It was found that the Nano-ZSM5/TiO2 composite was the most active among the investigated samples, which was attributed to the intimate contact between the two components of the composite, the preserved properties of the photocatalytic active phase in the final material, and the positive contribution of the nanozeolite by increasing the local concentration of propene.The authors thank Ministerio de Ciencia Innovación y Universidades and FEDER (Project RTI2018-095291-B-I00) and the Generalitat Valenciana (PROMETEOII/2018/076) for financial support. J.F.-C. thanks MINECO for a researcher formation grant (BES-2016-078079). M.N.-G. gratefully acknowledges Generalitat Valenciana and Plan GenT (CDEIGENT/2018/027) for the postdoctoral grant

Influence of temperature and regeneration cycles on Hg capture and efficiency by structured Au/C regenerable sorbents

8 pages, 10 figures, 2 tables.The objective of this work is to evaluate a novel regenerable sorbent for mercury capture based on gold nanoparticles supported on a honeycomb structured carbon monolith. A new methodology for gold nanoparticles deposition onto carbon monolith support has been developed to obtain an Au sorbent based on the direct reduction of a gold salt onto the carbon material. For comparison purposes, colloidal gold method was also used to obtain Au/C sorbents. Both types of sorbents were characterized by different techniques in order to obtain the bulk gold content, the particle size distribution and the chemical states of gold after deposition. The mercury capture capacity and mercury capture efficiency of sorbents were tested in a bench scale facility at different experimental conditions. The regenerability of the sorbents was tested along several cycles of Hg capture-regeneration. High retention efficiencies are found for both types of sorbents comparing their gold content. Moreover, the high retention efficiency is maintained along several cycles of Hg capture-regeneration. The study of the fresh sorbent, the sorbent after Hg exposition and after regeneration by XPS and XRD gives insight to explain those results. © 2013 Elsevier B.V.The financial support from Spanish Ministry of Science and Innovation and European Regional Development Funds (ref: ENE2011-23412) is duly recognized. C. Gómez- Giménez wants to thank CSIC and European Regional Development Funds for JAE grant.Peer Reviewe

Análisis comparativo de modelos hidrodinámicos y cinéticos para fotobiorreactores airlift

En las últimas décadas se han investigado nuevas fuentes de energía renovable, siendo las mi- croalgas una de las preferidas, debido a su alta pro- ducción de biomasa, utilizada en la elaboración de bio- combustibles de segunda generación como bioetanol, biohidrógeno y biodiesel. Las microalgas se cultivan en recipientes especializados llamados reactores, en los cuales se controlan las condiciones de cultivo para obtener la máxima producción de biomasa. A partir de datos experimentales se han generado modelos mate- máticos, que predicen el comportamiento que ocurre en el interior de los biorreactores, para realizar mejoras en el diseño y predecir las condiciones óptimas del cul- tivo y obtener una buena productividad. Se analizaron modelos hidrodinámicos de tres fases para establecer cuál de los modelos analizados predice de manera efi- ciente el comportamiento hidrodinámico a lo largo del biorreactor. Posteriormente se analizaron modelos de crecimiento de microorganismos fotosintetisantes en fotobiorreactores para acoplar el crecimiento de las mi- croalgas a la hidrodinámica desarrollada en la primera parte de la investigación y concluir con la simulación de un fotobiorreactor tipo Airlift

Light-driven motion of charged domain walls in isolated ferroelectrics

©2022 American Physical SocietyLight-induced ferroelectric domain wall motion turns out to be a promising phenomenon to de- velop new photo-controlled devices. However, the physical origin of this ligh-matter coupling when material is irradiated with visible light remains unclear. Here, a phenomenological model predicting the motion of charged domain walls (CDWs) is developed. The photo-induced electronic reconstruc- tion mechanism is proposed as the primary absorption mechanism, leading to a linear dependence for the polarization perturbation with the light intensity. Domain walls motion is then driven by the energetic difference between domains in a CDW array, such that the macroscopic polarization can be easily tuned.Postprint (author's final draft

Uso de residuos agroindustriales para fabricar proteínas a partir de la microalga Chlorella vulgaris

Nitrogen, a limiting factor of microalgal growth, is used for synthesis of proteins. Finding low-cost and unconventional sources of nitrogen for the crops, can enhance the yield and viability of the process. In this project, first at all, a theoretical selection of the potential wastes to be evaluated was carried out; then, the growth of the crop, productivity of the biomass and yield of the protein in the cultures of Chlorella vulgaris enriched with sources of organic and inorganic nitrogen, milk serum and NaNO3, with photoperiods of 12h light:12h darkness at 20±1 ºC, for 7 days, were evaluated. The highest growth rates of the crop were obtained with 0,041 gL-1 of nitrogen enriched with organic source, with a productivity of 0,07828 gL-1d-1. The most of the protein was obtained for the culture with whey: 55,63% in dry biomass, concluding that the enrichment with this source allowed a cellular and protein increase.El nitrógeno, factor limitante del crecimiento microalgal, se emplea para la síntesis de proteínas. Encontrar fuentes económicas y no convencionales de nitrógeno para los cultivos puede favorecer el rendimiento y la viabilidad del proceso. En este proyecto, primero, se realizó una selección teórica de los potenciales residuos que se iban a evaluar; luego, se evaluó el crecimiento del cultivo, productividad de biomasa microalgal y rendimiento de proteína en cultivos de Chlorella vulgaris enriquecidos con fuentes de nitrógeno orgánico e inorgánico, suero lácteo y NaNO3, con fotoperiodos de 12 h de luz: 12 h de oscuridad a 20 ± 1 ºC, durante 7 días. Las mayores tasas de crecimiento del cultivo se dieron a concentraciones de 0,041 gL-1 de nitrógeno enriquecido para la fuente orgánica, con una productividad de biomasa de 0,07828 gL-1d-1. La mayor fracción proteica se obtuvo para el cultivo con suero lácteo: 55,63 % en biomasa seca. Se concluye que el enriquecimiento con esta fuente orgánica de nitrógeno y carbono permitió un incremento celular y de proteína

Light-induced capacitance tunability in ferroelectric crystals

The remote controlling of ferroic properties with light is nowadays a hot and highly appealing topic in materials science. Here, we shed light on some of the unresolved issues surrounding light–matter coupling in ferroelectrics. Our findings show that the capacitance and, consequently, its related intrinsic material property, i.e., the dielectric constant, can be reversibly adjusted through the light power control. High photodielectric performance is exhibited across a wide range of the visible light wavelength because of the wavelength-independence of the phenomenon. We have verified that this counterintuitive behavior can be strongly ascribed to the existence of “locally free charges” at domain wall.Postprint (author's final draft