Sistema de supervisión del comportamiento de un vehículo robótico aéreo no tripulado

El trabajo esta centrado en el diseño e implementación de un sistema de supervisión del comportamiento de un vehículo aéreo no tripulado (UAV). En primer lugar se hace una introducción a los tipos de UAV y sus aplicaciones más comunes, estudiando sus características. Se explica el proyecto en el que se sitúa este trabajo y su participación en el mismo. A continuación se describe el diseño final del sistema de supervisión y su implementación, profundizando en la relación con el resto del proyecto. Finalmente, se muestran las pruebas y validaciones realizadas y se extraen unas conclusiones acorde a los resultados.---ABSTRACT---This report focuses on the design and implementation of a supervision system of the behavior of an unmanned aerial vehicle (UAV). First, the different UAV types are introduced along with their most common application fields, reviewing their characteristics. It is explained the project that encompasses this report. Second, it is described the final design and implementation of the supervision system, delving into the relation with the remainder of the project. Finally, the test and validations made are shown and conclusions are drawn in accordance with the results

Convolutional Neural Network Approach for Multispectral Facial Presentation Attack Detection in Automated Border Control Systems

[EN] Automated border control systems are the first critical infrastructure point when crossing a border country. Crossing border lines for unauthorized passengers is a high security risk to any country. This paper presents a multispectral analysis of presentation attack detection for facial biometrics using the learned features from a convolutional neural network. Three sensors are considered to design and develop a new database that is composed of visible (VIS), near-infrared (NIR), and thermal images. Most studies are based on laboratory or ideal conditions-controlled environments. However, in a real scenario, a subject’s situation is completely modified due to diverse physiological conditions, such as stress, temperature changes, sweating, and increased blood pressure. For this reason, the added value of this study is that this database was acquired in situ. The attacks considered were printed, masked, and displayed images. In addition, five classifiers were used to detect the presentation attack. Note that thermal sensors provide better performance than other solutions. The results present better outputs when all sensors are used together, regardless of whether classifier or feature-level fusion is considered. Finally, classifiers such as KNN or SVM show high performance and low computational level

Aplicación de Sistemas de Información Geográfica (SIG) en la Facultad de Ingeniería y Arquitectura de la Universidad de El Salvador

Este trabajo de graduación se enfocó en buscar soluciones mediante los Sistemas de Información Geográfica (SIG) los cuales facilitan de una forma más clara y ordenada la integración de mapas, planos, imágenes y Bases de Datos. Toda esta información puede lograr una mejor contribución para la optimización y el crecimiento urbano además de un control más ordenado de la Facultad de Ingeniería y Arquitectura en la Universidad de El Salvador, teniendo como prioridad el estudio de infraestructura, vegetación, mobiliario urbano e instalaciones, las cuales se desarrollaron e investigaron a lo largo de todo el document

Aplicación de Sistemas de Información Geográfica (SIG) en la Facultad de Ingeniería y Arquitectura de la Universidad de El Salvador

Este trabajo de graduación se enfocó en buscar soluciones mediante los Sistemas de Información Geográfica (SIG) los cuales facilitan de una forma más clara y ordenada la integración de mapas, planos, imágenes y bases de datos. Toda esta información puede lograr una mejor contribución para la optimización y el crecimiento urbano además de un control más ordenado de la Facultad de Ingeniería y Arquitectura en la Universidad de El Salvador, teniendo como prioridad el estudio de infraestructura, vegetación, mobiliario urbano e instalaciones, las cuales se desarrollaron e investigaron a lo largo de todo el document

Canted phase in double quantum dots

We perform a Hartree-Fock calculation in order to describe the ground state of a vertical double quantum dot in the absence of magnetic fields parallel to the growth direction. Intra- and interdot exchange interactions determine the singlet or triplet character of the system as the tunneling is tuned. At finite Zeeman splittings due to in-plane magnetic fields, we observe the continuous quantum phase transition from ferromagnetic to symmetric phase through a canted antiferromagnetic state. The latter is obtained even at zero Zeeman energy for an odd electron number.Comment: 5 pages, 3 figure

Validation of ATP bioluminescence as a tool to assess antimicrobial effects of mouthrinses in an in vitro subgingival-biofilm model

Objectives. The aim of this investigation was to evaluate whether the adenosine triphosphate (ATP) bioluminescence method is an appropriate tool to assess the efficacy of antiseptic mouthrinses in terms of quantitative reductions of total viable microbial counts in mixed biofilm populations in vitro. Study Design. Three mouthrinses, containing respectively, chlorhexidine and cetylpyridinium chloride (CHX/CPC), essential oils (EO) and amine fluoride/stannous fluoride (AFSF), as well as Phosphate Buffered Saline (PBS) used as control, were tested in an in vitro static biofilm model by ATP bioluminescence and compared to culture method. Biofilms were grown on saliva-coated hydroxyapatite disks for 72 hours and then exposed for 1 minute to the mouthrinse or control by immersion. The antibacterial effect of the rinses was tested by analysis of variance. The reliability of the ATP bioluminescence method was assessed by calculating the Pearson correlation coefficients when compared to the viable cell counts obtained by culture. Results. Using ATP bioluminescence, the antimicrobial activity of the tested mouthrinses was demonstrated when compared to the PBS control. The ATP bioluminescence values were significantly correlated (0.769, p<0.001) to the viable cell counts. CHX/CPC and AFSF showed similar antimicrobial activity, although AFSF had a less homogeneous effect, being both more effective than the EO rinse. Conclusion. ATP bioluminescence viability testing may be considered a useful tool to assess the in vitro efficacy of antibacterial compounds. In the proposed model, CHX/CPC and AFSF containing mouthrinses demonstrated superior antimicrobial activity, as compared to EO rinses, in a multispecies biofilm model

Antimycobacterial effect of selenium nanoparticles on Mycobacterium tuberculosis.

Tuberculosis remains the leading cause of death from a single infection agent worldwide. In recent years, the occurrence of tuberculosis cases caused by drug-resistant strains has spread, and is expected to continue to grow. Therefore, the development of new alternative treatments to the use of antibiotics is highly important. In that sense, nanotechnology can play a very relevant role, due to the unique characteristics of nanoparticles. In fact, different types of nanoparticles have already been evaluated both as potential bactericides and as efficient drug delivery vehicles. In this work, the use of selenium nanoparticles has been evaluated to inhibit the growth of two types of mycobacteria: Mycobacterium smegmatis and Mycobacterium tuberculosis. The results showed that selenium nanoparticles are able to inhibit the growth of both types of mycobacteria by damaging their cell envelope integrity. These results open a new opportunity for the use of this type of nanoparticles as antimycobacterial agents by themselves, or for the development of novel nanosystems that combine the action of these nanoparticles with other drugs

MORFOLOGÍA DE LOS GRANOS DE POLEN DE LA FAMILIABORAGINACEAE DE LA ESTACIÓN DE BIOLOGÍA CHAMELA, JALISCO,MÉXICO

Pollen morphology of four genera andfourteen species of Boraginaceae wasstudied and illustrated. The observationsof pollen grains were carried out under thelight microscopy and the scanning electronmicroscopy. Seven main pollen types werefound: tricolporate, reticulate in Bourreriarubra Lott y Miller; tricolporate,microechinate in Cordia alliodora Ruiz yPavon, C. elaeagnoides DC. y C.gerascanthus L.; tricolporate, striatereticulate in C. seleriana Fern; triporate,eureticulate in C. curassavica (Jacq.)Roemer y Schultes and C. inermis (Miller)I.M. Johnston; tricolporate withpseudocolpi, psilate, verrugate or rugulatein Heliotropium angiospermum Murray,H. procumbens Miller, Tournefortiahartwegiana Steud and T. volubilis L.;tricolporate with negative reticulum in H.indicum and Cordia dentata Poiret; porate,gemmate in T. hirsutissima L. These pollentypes are correlated with taxonomy of thefamily.Se presenta e ilustra la morfología del polende cuatro géneros y catorce especies deBoraginaceae de Chamela, Jalisco. Lasobservaciones se realizaron al microscopiode luz y al microscopio electrónico debarrido. Siete tipos polínicos fuerondiferenciados: tricolporado, reticulado enBourreria rubra LottyMiller; tricolporado,microequinado en Cordia alliodora (Ruizy Pavón) Oken, C. elaeagnoides DC. y C.gerascanthus L.; tricolporado, estriadoreticulado en C. seleriana Fern; triporado,eureticulado en C. curassavica (Jacq.)Roemer ySchultes yC. inermis (Miller) I.M.Johnston; tricolporado con pseudocolpos,psilado, verrugado o rugulado enHeliotropium angiospermum Murray, H.procumbens Miller; Tournefortiahartwegiana Stend y T. volubilis L.;tricolporado con retículo negativo en H.índicum L. y Cordia dentata Poiret;porado, gemado en T. hirsutissima L. Sediscute la relación entre los tipos polínicosencontrados y la taxonomía de la familia

MORFOLOGIA DE LOS GRANOS DE POLEN DE LA SUBFAMILIA CAESALPINIOIDEAE (LEGUMINOSAE) DEL VALLE DE MEXICO

Pollen grains of four species belonging toCaesalpinioideae subfamily (Leguminosae) from Valleyof Mexico are studied with light and scanning electronmicroscopy. The species are: Caesalpinia cacalaco H. &amp;B., Krameria secundi-flora DC., Senna multiglandulosa(Jacq.) Irwin &amp; Barneby and S. septentrionalis (Viviani)Irwin &amp; Barneby.The first two species can be easyly separated bypalynological characters, which is difficult in the speciesof Senna that only can be separated by means of scanningelectron microscopy observations.Se estudian al microscopio electrónico de barrido y almicroscopio de luz los granos de polen de cuatro especiesde la subfamilia Caesalpinioideae (Leguminosae) queprogresan en el Valle de México que son: Caesalpiniacacalaco H. &amp; B., Krameria secundiflora DC., Sennamultiglandulosa (Jacq.) Irwin &amp; Barneby and S.septentrionalis (Viviani) Irwin &amp; Barneby.Las primeras dos especies pueden ser fácilmenteseparadas por sus características palinológicas en cambiolas especies de Senna presentan dificultad, sólo pueden serdiferenciadas mediante el microscopio electrónico debarrido

The impact of agricultural management on soil aggregation and carbon storage is regulated by climatic thresholds across a 3000 km European gradient

Organic carbon and aggregate stability are key features of soil quality and are important to consider when evaluating the potential of agricultural soils as carbon sinks. However, we lack a comprehensive understanding of how soil organic carbon (SOC) and aggregate stability respond to agricultural management across wide environmental gradients. Here, we assessed the impact of climatic factors, soil properties and agricultural management (including land use, crop cover, crop diversity, organic fertilization, and management intensity) on SOC and the mean weight diameter of soil aggregates, commonly used as an indicator for soil aggregate stability, across a 3000 km European gradient. Soil aggregate stability (−56%) and SOC stocks (−35%) in the topsoil (20 cm) were lower in croplands compared with neighboring grassland sites (uncropped sites with perennial vegetation and little or no external inputs). Land use and aridity were strong drivers of soil aggregation explaining 33% and 20% of the variation, respectively. SOC stocks were best explained by calcium content (20% of explained variation) followed by aridity (15%) and mean annual temperature (10%). We also found a threshold-like pattern for SOC stocks and aggregate stability in response to aridity, with lower values at sites with higher aridity. The impact of crop management on aggregate stability and SOC stocks appeared to be regulated by these thresholds, with more pronounced positive effects of crop diversity and more severe negative effects of crop management intensity in nondryland compared with dryland regions. We link the higher sensitivity of SOC stocks and aggregate stability in nondryland regions to a higher climatic potential for aggregate-mediated SOC stabilization. The presented findings are relevant for improving predictions of management effects on soil structure and C storage and highlight the need for site-specific agri-environmental policies to improve soil quality and C sequestration