Composite Fading Models based on Inverse Gamma Shadowing: Theory and Validation

We introduce a general approach to characterize composite fading models based on inverse gamma (IG) shadowing. We first determine to what extent the IG distribution is an adequate choice for modeling shadow fading, by means of a comprehensive test with field measurements and other distributions conventionally used for this purpose. Then, we prove that the probability density function and cumulative distribution function of any IG-based composite fading model are directly expressed in terms of a Laplace-domain statistic of the underlying fast fading model and, in some relevant cases, as a mixture of wellknown state-of-the-art distributions. Also, exact and asymptotic expressions for the outage probability are provided, which are valid for any choice of baseline fading distribution. Finally, we exemplify our approach by presenting several application examples for IG-based composite fading models, for which their statistical characterization is directly obtained in a simple form.Comment: This work has been submitted to the IEEE for publication. Copyright may be transferred without notice, after which this version may no longer be accessibl

Backing off from rayleigh and rice: Achieving perfect secrecy in wireless fading channels

We show that for a legitimate communication under multipath quasi-static fading with a reduced number of scatter- ers, it is possible to achieve perfect secrecy even in the presence of a passive eavesdropper for which no channel state information is available. Specifically, we show that the outage probability of secrecy capacity (OPSC) is zero for a given range of average signal-to-noise ratios (SNRs) at the legitimate and eavesdropper’s receivers. As an application example, we analyze the OPSC for the case of two scatterers, explicitly deriving the relationship between the average SNRs, the secrecy rate RS and the fading model parameters required for achieving perfect secrecy.Ministerio de Ciencia e Innovación (TEC2017-87913R) Consejería de Innovación y Ciencia (P18-RT-3175

“ESTUDIO DE LA INFLUENCIA DE LA CONCENTRACIÓN Y TIEMPO DE REACCIÓN EN PLASTIFICACIÓN Y BIODEGRADACIÓN DE POLIPROPILENO MODIFICADO CON UN ACEITE DE SOYA”

En el presente trabajo se determinaron las condiciones de plastificación de membrana de polipropileno (PP) usando Aceite de Soya Epoxidado y Acrilatado (ASEA), llevando a cabo una reacción de polimerización por injerto, entre el radical libre del carbono trisustituido del PP y el grupo acrilato del ASEA en presencia de luz ultravioleta. Los parámetros a evaluar fueron; el grado de injerto variando la concentración del ASEA y tiempo de reacción en la radiación de luz UV. El método de polimerización por injerto consistió en preparar una solución de ASEA en Dimetilformamida (DMF) a diferentes concentraciones y variando los tiempos de radiación. Se obtuvo un rendimiento de 366 % en peso de injerto a una concentración de 70% y un tiempo de radiación de 6 horas, a estas condiciones se observó el máximo grado de injerto. La membrana fue caracterizada utilizando espectroscopia de infrarrojo con transformada de Fourier (FT-IR-ATR), Difracción de rayos X de polvos, Microscopía Electrónica de Barrido y Ángulo de Contacto.. Para las pruebas de degradación se analizaron diferentes microorganismos tales como Bacillus Cereus, Pseudomonas, Aspergilus Niger y Rhizopus, durante 60 días. Encontrando que el microorganismo Pseudomona spp produce el mayor porcentaje de degradación a una concentración de 70% y 6 h de radiación UV. En el capítulo 1 y 2 se describe las generalidades de los polímeros, los tipos de polimerización que se llevan a cabo, los diferentes iniciadores de la polimerización, se describe las características del polipropileno y sus tipos. Se mencionan las generalidades de las membranas y su clasificación. Se habla de las membranas poliméricas, los métodos de preparación y la modificación de las mismas. El capítulo 3 detalla el tema de los aceites naturales y sus derivados, las reacciones en las que están involucrados, se habla de las generalidades del Aceite de Soya Epoxidado y Acrilatado, su polimerización y utilidades. El tema de la degradación polimérica se ve reflejado en el capítulo 4, se describen las generalidades de los microorganismos y su clasificación, las características de las bacterias Bacilluous cereus y Pseudomonas SPP, los hongos Aspergilu niger y 12 Rhizopus stolonifer, los factores que afectan la biodegradación y sus mecanismos. Mientras que en el capítulo 5 se toma el tema de las técnicas de caracterización para el análisis de las pruebas. Finalmente, en el capítulo 6 y 7 se muestra la metodología, los resultados y análisis arrojados en las pruebas para la determinación de las condiciones de polimerización por injerto de la ASEA en la MPP a diferentes concentraciones en peso y variando los tiempos de radiación UV, y las pruebas preliminares de biodegradación usando los microorganismos Bacilluous cereus y Pseudomonas SPP, los hongos Aspergilu niger y Rhizopus stolonifer; además de las conclusiones a las que se llegó en el presente trabajo

Ecodesign of organic photovoltaic modules from Danish and Chinese perspectives

The ecodesign of an OPV solar park is reported covering the complete life cycle: manufacturing, use and disposal stages. For the first time the life cycle inventory for such a technology is provided for its use in future LCA and EIA studies. Recommendations with the aim to influence PV policy and decision makers are given.</p

Dirhodium Complexes as Possible Dual-Binding Photodynamic Therapy Agents

2012 Denman Undergraduate Research Forum Winner. Third Place. Mathematical and Physical SciencesA new type of dirhodium paddlewheel complexes were synthesized that contain ligands with extended π-systems. These ligands are expected to increase the affinity of these complexes for DNA because they are known to intercalate between the DNA bases in related systems. In addition, the new complexes possess equatorial acetonitrile ligands that exchange for water molecules upon photolysis, which produces an activated form of the complex that is able to bind covalently to DNA. These features lead to dual-binding through covalent binding to DNA upon irradiation and intercalation of the extended π-system ligand between the DNA bases. Currently, there are no reports of photoactivated dual-binding agents. These complexes possess features desired of photodynamic therapy agents, primarily because they are inactive in the dark, and readily bind to DNA when irradiated. The dirhodium bis-amidate complexes cis-H,H-[Rh2(HNOCCH3)2(bpy)(CH3CN)4][BF4]2 (bpy = 2,2´-bipyridine) and cis-H,H-[Rh2(HNOCCH3)2(dpq)(CH3CN)4][BF4]2 (dpq = dipyrido[3,2-f:2',3'-h]-quinoxaline) were successfully synthesized from cis-H,H-[Rh2(HNOCCH3)2(CH3CN)6][BF4]2 with the corresponding bidentate ligand. The bpy complex was prepared in 7 days, and because it cannot intercalate between the DNA bases, it is used as a control for no intercalation, but it was shown to bind covalently to DNA upon irradiation. The dpq complex was synthesized successfully in 1 day. Studies of this complex are underway and its intercalation ability has not yet been proven. The synthesis of related complexes with other bidentate ligands is ongoing. The preparation of complexes possessing acetate bridging ligands instead of amidates were attempted from the reaction of cis-[Rh2(CH3COO)2(CH3CN)6]2+ and bpy. Cis-[Rh2(CH3COO)2(bpy)(CH3CN)4]2+ was not successfully synthesized, but it is still of interest, since its precursor cis-[Rh2(CH3COO)2(CH3CN)6]2+ binds to DNA upon irradiation and it is inactive under dark conditions.No embarg

First steps of the FIBRESHIP project: Engineering, production and life cycle management for the complete construction of large length fibre-based ships.

The main objective of the FIBRESHIP project is to enable the building of the complete hull and superstructure of large-length seagoing and inland ships in FRP materials by overcoming few technical challenges. In order to achieve this objective, the project will develop, qualify and audit innovative FRP materials for marine applications, elaborate new design and production guidelines and procedures, generate efficient production and inspection methodologies, and develop new validated software analysis tools. Clear performance indicators will be designed and applied in the evaluation of the different solutions developed for three targeted vessels categories. Finally, the different technologies generated in FIBRESHIP will be first validated and then demonstrated by using advanced simulation techniques and experimental testing on real-scale structures. This paper is dealing with the presentation of the project scope and progress of the FIBRESHIP project over the first six months

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