On the Controllability of the Fifth-Order Korteweg-De Vries Equation

International audienc

Hermite Coherent States for Quadratic Refractive Index Optical Media

Producción CientíficaLadder and shift operators are determined for the set of Hermite–Gaussian modes associated with an optical medium with quadratic refractive index profile. These operators allow to establish irreducible representations of the su(1, 1) and su(2) algebras. Glauber coherent states, as well as su(1, 1) and su(2) generalized coherent states, were constructed as solutions of differential equations admitting separation of variables. The dynamics of these coherent states along the optical axis is also evaluated.MINECO grant MTM2014-57129-C2-1-P and Junta de Castilla y Leon grant VA057U16

A new methodology called dice game optimizer for capacitor placement in distribution systems

Purpose. Shunt capacitors are installed in power system for compensating reactive power. Therefore, feeder capacity releases, voltage profile improves and power loss reduces. However, determination optimal location and size of capacitors in distributionsystems is a complex optimization problem. In order to determine the optimum size and location of the capacitor, an objective function which is generally defined based on capacitor installation costs and power losses should be minimized According to operational limitations. This paper offers a newly developed metaheuristic technique, named dice game optimizerto determine optimal size and location of capacitors in a distribution network. Dice game optimizer is a game based optimization technique that is based on the rules of the dice game.Цель. Шунтирующие конденсаторы в энергосистеме устанавливаются для компенсации реактивной мощности. Следовательно, снижается емкость фидера, улучшается профиль напряжения и снижаются потери мощности. Однако определение оптимального местоположения и размера конденсаторов в системах распределения является сложной задачей оптимизации. Чтобы определить оптимальный размер и расположение конденсатора, целевую функцию, которая обычно определяется на основе затрат на установку конденсатора и потерь мощности, следует минимизировать в соответствии с эксплуатационными ограничениями. Данная статья предлагает недавно разработанный метаэвристический метод, называемый оптимизатором игры в кости, для определения оптимального размера и расположения конденсаторов в распределительной сети. Оптимизатор игры в кости – это игровой метод оптимизации, основанный на правилах игры в кости

Uso de Sentinel-2 y datos auxiliares para la generación, mediante clasificación de imágenes, del Mapa de Usos y Cubiertas del Suelo de Cataluña 2017

[EN] This paper details the process of generating the 2017 Land Use/Land Cover Map of Catalonia (MUCSC) using automatic classification of satellite imagery and auxiliary cartographic and remote sensing data. A total of 60 images (6 dates for each of the 10 tiles covering Catalonia) captured by the Sentininel-2A and Sentinel-2B satellites were used. These images as well as texture variables, terrain models derived from lidar processing, and vegetation and wetness indices were classified using the k-Nearest Neighbor algorithm (kNN) to obtain a map with 25 categories. The categories related to urbanized areas (urban areas, urbanizations and industrial zones/ commercial areas), road infrastructures and burned areas were edited using official cartographic datasets of the Catalan Government [Generalitat]. The results have an overall accuracy greater than 98 %, which was evaluated with a set of more than 8.6 million independent test pixels. This work represents an important milestone in terms of the computational effort it involves due to the territorial extension (32 000 km2), the spatial detail of between 2 and 20 m, the use of up to 58 variables, the relative completeness of the legend and the level of success achieved. The MUCSC 2017, which is part of a 30-year quinquennial series beginning in 1987, can be downloaded in different formats (also in MMZX: new ISO 19165-2) and at resolutions of 10 m and 30 m pixel side from the Ministry of Territory and Sustainability website of the Catalan Government.[ES] En este artículo se detalla el proceso de generación del Mapa de Usos y Cubiertas del Suelo de Cataluña (MUCSC) 2017 mediante clasificación automática de imágenes de satélite y datos cartográficos y de teledetección auxiliares. Con este propósito se han utilizado un total de 60 imágenes (6 fechas sobre cada una de las 10 teselas que cubren Cataluña) captadas por los satélites 2A y 2B de la constelación Sentinel-2. Estos datos, junto con variables de textura, modelos del terreno derivados del procesado lidar para todo el territorio e índices de vegetación y humedad, han sido clasificados con el algoritmo de inteligencia artificial kNN para obtener un mapa de 25 categorías, de las cuales las referentes a zonas urbanizadas (zonas urbanas, urbanizaciones y zonas industriales y comerciales), vías de comunicación y zonas quemadas han sido editadas utilizando bases cartográficas oficiales de la Generalitat [Gobierno] de Catalunya. Los resultados muestran un acierto global superior al 98 % evaluado mediante un conjunto de más de 8,6 millones de píxeles independientes de test. Este trabajo representa un hito importante tanto por el esfuerzo de cálculo que ha supuesto (extensión territorial de 32.000 km2, detalle espacial de entre 2 y 20 m y uso de hasta 58 variables), como por la relativa completitud de la leyenda y por el nivel de acierto conseguido. El MUCSC 2017, que forma parte de una serie quinquenal de 30 años desde 1987, está disponible para descarga en distintos formatos (también en MMZX: nueva ISO 19165-2) y a resoluciones de 10 m y 30 m de lado de píxel a través de la página web en el Departamento de Territorio y Sostenibilidad de la Generalitat de Catalunya.This study was funded by the Generalitat (Grumets SGR2014-1491) and by the Spanish MCIU through the NEWFORLAND project (RTI2018-099397-B-C21 MCIU/AEI/ERDF, EU). X. Pons is the recipient of an ICREA Academia 2016 -2020 Excellence in Research Grant.González-Guerrero, O.; Pons, X. (2020). The 2017 Land Use/Land Cover Map of Catalonia based on Sentinel-2 images and auxiliary data. Revista de Teledetección. 0(55):81-92. https://doi.org/10.4995/raet.2020.13112OJS8192055Cea, C., Cristóbal, J., Pons, X. 2007. An improved methodology to map snow cover by means of Landsat and MODIS imagery. En: Geoscience and Remote Sensing Symposium, 2007. IGARSS 2007. Barcelona. IEEE International, 4217-4220. DOI https://doi.org/10.1109/IGARSS.2007.4423781Elvidge, C.D., Sutton, P.C., Wagner, T.W., Ryznar, R., Goetz, S.J., Smith, A.J., Jantz, C., Seto, K., Imhoff, M.L., Vogelmann, J., wang, Y.Q., Milesi, C., Nemani, R. 2004. Urbanization. En: Gutman, G. et al. (ed.). Land change science: Observing, monitoring, and understanding trajectories of change on the earth's surface. Dordrecht, Países Bajos: Kluwer Academic Publishers, pp. 315-328. https://doi.org/10.1007/978-1-4020-2562-4_18ESA. 2015. Sentinel-2 User Handbook. Recuperado de https://sentinel.esa.int/documents/247904/685211/ Sentinel-2_User_Handbook Último acceso: 4 de febrero, 2020.González-Guerrero, O., Pons-Fernández, X., Bassols- Morey, R., Camps-Fernandez, F.J. 2019. Dinàmica de les superfícies de conreu a Catalunya mitjançant Teledetecció en el període 1987-2012. Quaderns Agraris, 46, 59-91.Hansen, M.C., Loveland, T.R. 2012. A review of large area monitoring of land cover change using Landsat data. Remote Sensing of Environment, 122, 66-74. https://doi.org/10.1016/j.rse.2011.08.024ICC. 1992. Mapa d'usos del sòl de Catalunya. Institut Cartogràfic de Catalunya. Barcelona. 118 p.ICGC (2017). Datos lidar. Institut Cartogràfic i Geològic de Catalunya. Recuperado de https://www.icgc.cat/ es/Descargas/Elevaciones/Datos-lidar Último acceso: 1 de mayo, 2020.Loveland, T.R., Dwyer, J.L. 2012. Landsat: Building a strong future. Remote Sensing of Environment, 122, 22-29. https://doi.org/10.1016/j.rse.2011.09.022Moré, G., Pons, X. 2007. Influencia del número de imágenes en la calidad de la cartografía detallada de vegetación forestal. Revista de Teledetección, 28, 61- 68. Recuperado de http://www.aet.org.es/revistas/ revista28/7-111_More_revisado.pdf Último acceso: 1 de mayo, 2020.Padial, M., Vidal-Macua, J.J., Serra, P., Ninyerola, M., Pons, X. 2019. Aplicación de filtros multicriterio basados en NDVI para la extracción de áreas de entrenamiento desde la base de datos SIOSE. Ruiz L.A., Estornell J., Calle A., Antuña-Sánchez J.C. (eds) Teledetección: hacia una visión global del cambio climático, pp. 311-314. ISBN: 978- 84-1320-038-5. Libro de actas XVIII Congreso de la Asociación Española de Teledetección, 24 - 27 Septiembre, Valladolid (Spain).Padró, J.C., Pons, X., Aragonés, D., Díaz-Delgado, R., García, D., Bustamante, J., Pesquer, L., Domingo- Marimon, C., González-Guerrero, O., Cristóbal, J., Doktor, D., Lange, M. 2017. Radiometric Correction of Simultaneously Acquired Landsat-7/Landsat-8 and Sentinel-2A Imagery Using Pseudoinvariant Areas (PIA): Contributing to the Landsat Time Series Legacy. Remote Sensing, 9(12), 1319. https://doi.org/10.3390/rs9121319Padró, J.C., Muñoz, F.J., Ávila, L.A., Pesquer, L., Pons, X. 2018. Radiometric Correction of Landsat-8 and Sentinel-2A Scenes Using Drone Imagery in Synergy with Field Spectroradiometry. Remote Sensing, 10(11), 1687. https://doi.org/10.3390/rs10111687Pons, X. 2004. MiraMon. Sistema de Información Geográfica y software de Teledetección. Centre de Recerca Ecològica i Aplicacions Forestals, CREAF. Bellaterra. ISBN: 84-931323-4-9. Recuperado de http://www.miramon.cat/Index_es.htm Último acceso: 1 de mayo, 2020.Pons, X., Ninyerola, M. 2008. Mapping a topographic global solar radiation model implemented in a GIS and refined with ground data. International Journal of Climatology, 28(13), 1821-1834. https://doi.org/10.1002/joc.1676Pons, X., Pesquer, L., Cristóbal, J., González- Guerrero, O. 2014. Automatic and improved radiometric correction of Landsat imagery using reference values from MODIS surface reflectance images. International Journal of Applied Earth Observation and Geoinformation, 33, 243-254. https://doi.org/10.1016/j.jag.2014.06.002Pons X., Masó J. 2016. A comprehensive open package format for preservation and distribution of geospatial data and metadata. Computers & Geosciences, 97, 89-97. https://doi.org/10.1016/j.cageo.2016.09.001Townshend, J.R., Masek, J.G., Huang, C., Vermote, E.F., Gao, F., Channan, S., Sexton, J.O., Feng, M., Narasimhan, R., Kim, D., Song, K., Song, D., Song, X. P., Noojipady, P., Tan, B., Hansen, M.C., Li, M., Wolfe, R.E. 2012. Global characterization and monitoring of forest cover using Landsat data: Opportunities and challenges. International Journal of Digital Earth, 5(5), 373-397. https://doi.org/10.1080/17538947.2012.713190Woodcock, C.E., Allen, R., Anderson, M., Belward, A., Bindschadler, R., Cohen, W., Gao, F., Goward, S.N., Helder, D., Helmer, E., Nemani, R., Oreopoulos, L., Schott, J., Thenkabail, P.S., Vermote, E.F., Vogelmann, J., Wulder, M.A., Wynne, R. 2008. Free access to Landsat imagery. Science, 320(5879), 1011. https://doi.org/10.1126/science.320.5879.1011aWulder, M.A., Masek, J.G., Cohen, W.B., Loveland, T.R., Woodcock, C.E. 2012. 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Controllability and observabiliy of an artificial advection-diffusion problem

In this paper we study the controllability of an artificial advection-diffusion system through the boundary. Suitable Carleman estimates give us the observability on the adjoint system in the one dimensional case. We also study some basic properties of our problem such as backward uniqueness and we get an intuitive result on the control cost for vanishing viscosity.Comment: 20 pages, accepted for publication in MCSS. DOI: 10.1007/s00498-012-0076-

Model of the meniscus of an ionic liquid ion source.

A simple model of the transfer of charge and ion evaporation in the meniscus of an ionic-liquid ion source working in the purely ionic regime is proposed on the basis of order-of-magnitude estimates which show that, in this regime, _i_ the flow in the meniscus is dominated by the viscosity of the liquid and is affected very little by the mass flux accompanying ion evaporation, and _ii_ the effect of the space charge around the evaporating surface is negligible and the evaporation current is controlled by the finite electrical conductivity of the liquid. The model predicts that a stationary meniscus of a very polar liquid undergoing ion evaporation is nearly hydrostatic and can exist only below a certain value of the applied electric field, at which the meniscus attains its maximum elongation but stays smooth. The electric current vs applied electric field characteristic displays a frozen regime of negligible ion evaporation at low fields and a conduction-controlled regime at higher fields, with a sharp transition between the two regimes owing to the high sensitivity of the ion evaporation rate to the electric field. A simplified treatment of the flow in the capillary or liquid layer through which liquid is delivered to the meniscus shows that the size of the meniscus decreases and the maximum attainable current increases when the feeding pressure is decreased, and that appropriate combinations of feeding pressure and pressure drop may lead to high maximum currents

VISIR-VLT high resolution study of the extended emission of four obscured post-AGB candidates

The onset of the asymmetry of planetary nebulae (PNe) is expected to occur during the late Asymptotic Giant Branch (AGB) and early post-AGB phases of low- and intermediate-mass stars. Among all post-AGB objects, the most heavily obscured ones might have escaped the selection criteria of previous studies detecting extreme axysimmetric structures in young PNe. Since the most heavily obscured post-AGB sources can be expected to descend from the most massive PN progenitors, these should exhibit clear asymmetric morphologies. We have obtained VISIR-VLT mid-IR images of four heavily obscured post-AGB objects barely resolved in previous Spitzer IRAC observations to analyze their morphology and physical conditions across the mid-IR. The VISIR-VLT images have been deconvolved, flux calibrated, and used to construct RGB composite pictures as well as color and optical depth maps that allow us to study the morphology and physical properties of the extended emission of these sources. We have detected extended emission from the four objects in our sample and resolved it into several structural components that are greatly enhanced in the temperature and optical depth maps. They reveal the presence of asymmetry in three young PNe (IRAS 15534-5422, IRAS 17009-4154, and IRAS 18454+0001), where the asymmetries can be associated with dusty torii and slightly bipolar outflows. The fourth source (IRAS 18229-1127), a possible post-AGB star, is better described as a rhomboidal detached shell. The heavily obscured sources in our sample do not show extreme axisymmetric morphologies. This is at odds with the expectation of highly asymmetrical morphologies in post-AGB sources descending from massive PN progenitors. The sources presented in this paper may be sampling critical early phases in the evolution of massive PN progenitors, before extreme asymmetries develop.Comment: 9 pages, 4 figure

Stratified decision forests for accurate anatomical landmark localization in cardiac images

Accurate localization of anatomical landmarks is an important step in medical imaging, as it provides useful prior information for subsequent image analysis and acquisition methods. It is particularly useful for initialization of automatic image analysis tools (e.g. segmentation and registration) and detection of scan planes for automated image acquisition. Landmark localization has been commonly performed using learning based approaches, such as classifier and/or regressor models. However, trained models may not generalize well in heterogeneous datasets when the images contain large differences due to size, pose and shape variations of organs. To learn more data-adaptive and patient specific models, we propose a novel stratification based training model, and demonstrate its use in a decision forest. The proposed approach does not require any additional training information compared to the standard model training procedure and can be easily integrated into any decision tree framework. The proposed method is evaluated on 1080 3D highresolution and 90 multi-stack 2D cardiac cine MR images. The experiments show that the proposed method achieves state-of-theart landmark localization accuracy and outperforms standard regression and classification based approaches. Additionally, the proposed method is used in a multi-atlas segmentation to create a fully automatic segmentation pipeline, and the results show that it achieves state-of-the-art segmentation accuracy

Theoretical study of the HS (v',,j' = 1) + O2;(v''=0,j''=1) reaction

We report a theoretical study of the title four-atom reaction for a wide range of translational energies, considering the reactants in the ground vibrational state and also in some vibrationally excited levels of the HS radical. All calculations have employed the quasi-classical trajectory (QCT) method and a reported double many-body expansion potential energy surface for ground electronic state of HSO2. Cross sections as well as specific rate constants for HS elimination are reported and compared with literature data for such processes. To account the zero-point energy problem in QCT calculations, an internal energy quantum mechanics threshold (IEQMT) criteria is used. © 2008 Wiley Periodicals, Inc. Int J Quantum Chem, 200