On perfect and quasiperfect dominations in graphs

A subset S ¿ V in a graph G = ( V , E ) is a k -quasiperfect dominating set (for k = 1) if every vertex not in S is adjacent to at least one and at most k vertices in S . The cardinality of a minimum k -quasiperfect dominating set in G is denoted by ¿ 1 k ( G ). Those sets were first introduced by Chellali et al. (2013) as a generalization of the perfect domination concept and allow us to construct a decreasing chain of quasiperfect dominating numbers n = ¿ 11 ( G ) = ¿ 12 ( G ) = ... = ¿ 1 ¿ ( G ) = ¿ ( G ) in order to indicate how far is G from being perfectly dominated. In this paper we study properties, existence and realization of graphs for which the chain is short, that is, ¿ 12 ( G ) = ¿ ( G ). Among them, one can find cographs, claw-free graphs and graphs with extremal values of ¿ ( G ).Postprint (published version

Introducció a la col·lecció de teixits coptes del Museu Episcopal de Vic

Amb motiu de la recent inauguració del nou edifici del Museu Episcopal de Vic, duta a terme l’any 2002, es van poder presentar al públic en les sales d’exposició permanent les peces més significatives de la col·lecció de teixits coptes del Museu. Durant l’any 2006 les restauradores Carmen Masdeu Costa i Luz Morata García han dut a terme la restauració de cinc fragments coptes i un teixit fatimita de la col·lecció del Museu. En el present article exposen el procés d’aquesta restauració així com les mesures de conservació preventiva adoptades. Rosa Maria Martín fa una introducció sobre el procés de formació d’aquesta col·lecció copta del MEV. The recent inauguration of the new Museu Episcopal building in Vic, which took place in 2002, provided the opportunity for the most significant pieces in the museum’s collection of Coptic textiles to be exhibited to the public in its permanent exhibition rooms. In the course of 2006, restorers Carmen Masdeu Costa and Luz Morata García completed the restoration of five Coptic fragments and a Fatimid textile from the museum’s collection. In the present article they discuss these restoration processes, as well as the preventive preservation measures adopted. Rosa Maria Martín provides an introduction to the development of this Coptic collection at the MEV

Evolution of dwarf galaxies: characterizing star formation scenarios

This is an electronic version of the lecture presented at the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held on September 13-17, 2010, in Madrid

3D model validation to estimate intercepted radiation using high spatial resolution imagery in row-tree canopies

En este trabajo se llevó a cabo la validación del modelo 3D de transferencia radiativa FLIGHT para la estimación de la fracción de radiación fotosintéticamente activa interceptada (fIPAR) en cubiertas heterogéneas. El modelo permite simular cubiertas de tipo discontinuo evaluando la relación entre la energía reflejada y absorbida en función de distintos parámetros como la estructura de la plantación, geometría de visión o las propiedades espectrales del suelo y la vegetación. El estudio fue llevado a cabo en cultivos de melocotón y naranjo, pertenecientes a fincas comerciales situadas en las provincias de Córdoba y Sevilla. De cada plantación, se tomaron imágenes multiespectrales de alta resolución mediante un vehículo aéreo no tripulado (UAV) en zonas de estudio con un amplio rango de heterogeneidad estructural, donde se realizaron medidas ópticas foliares, estructurales y de interceptación de radiación. El sensor utilizado para la toma de imágenes fue una cámara multiespectral de 6 bandas y 10 nm FWHM, obteniendo los datos de radiación interceptada para validación de fIPAR mediante ceptómetro en el momento del vuelo del UAV. Los errores obtenidos en la estimación de fIPAR usando el modelo FLIGHT fueron de 10% RMSE, permitiendo parametrizar la relación NDVI vs fIPARA study was conducted to evaluate the 3D radiative transfer model FLIGHT to estimate fraction of Intercepted Photosyntetically Active Radiation (fIPAR) in heterogeneous canopies. The FLIGHT 3D canopy model enables simulation of the effects of different input parameters on fIPAR, such as the orchard architecture, planting grid, solar geometry and background artifacts. The study was conducted over two commercial peach and orange orchards located in Cordoba and Seville, where study areas showing a gradient in heterogeneous structure were selected. High resolution multispectral imagery was acquired by an unmanned aerial vehicle (UAV). The multispectral sensor used in this study was a 6-band multispectral camera with 10nm FWHM bands, using a ceptometer for ground truth data of intercepted radiation. Estimates for radiation interception using a modeling approach yielded errors bellow 10% RMS

From an organometallic monolayer to an organic monolayer covered by metal nanoislands: A simple thermal protocol for the fabrication of the top contact electrode in molecular electronic devices

et al.In this contribution, a novel method for practical uses in the fabrication of the top contact electrode in a metal/organic monolayer/metal device is presented. The procedure involves the thermally induced decomposition of an organometallic compound, abbreviated as the TIDOC method. Monolayers incorporating the metal organic compounds (MOCs) [[4-{(4-carboxy)ethynyl}phenyl]ethynyl]-(triphenylphosphine)-gold, 1, or [1-isocyano-4-methoxybenzene]-[4-amino-phenylethynyl]-gold, 2, were annealed at moderate temperatures (1: 150 °C for 2h and 2: 100 °C for 2 h), resulting in cleavage of the Au-P or Au-C bond and reduction of Au(I) to Au(0) as metallic gold nanoparticles (GNPs). These particles are distributed on the surface of the film resulting in formation of metal/molecule/GNP sandwich structures. Electrical properties of these nascent devices were determined by recording I¿V curves with a conductive-AFM. The I¿V curves collected from these metal/organic monolayer/GNPs sandwich structures are typical of metal-molecule-metal junctions, with no low resistance traces characteristic of metallic short circuits observed over a wide range of set-point forces. The TIDOC method is therefore an effective procedure for the fabrication of molecular junctions for the emerging area of molecular electronics.Peer Reviewe

Characterization of goat colostrum oligosaccharides by nano-liquid chromatography on chip quadrupole time-of-flight mass spectrometry and hydrophilic interaction liquid chromatography-quadrupole mass spectrometry

A detailed qualitative and quantitative characterization of goat colostrum oligosaccharides (GCO) has been carried out for the first time. Defatted and deproteinized colostrum samples, previously treated by size exclusion chromatography (SEC) to remove lactose, were analyzed by nanoflow liquid chromatography–quadrupole-time of flight mass spectrometry (Nano-LC-Chip–Q-TOF MS). Up to 78 oligosaccharides containing hexose, hexosamine, fucose, N-acetylneuraminic acid or Nglycolylneuraminic acid monomeric units were identified in the samples, some of them detected for the first time in goat colostra. As a second step, a hydrophilic interaction liquid chromatography coupled to mass spectrometry (HILIC-MS) methodology was developed for the separation and quantitation of the main GCO, both acidic and neutral carbohydrates. Among other experimental chromatographic conditions, mobile phase additives and column temperature were evaluated in terms of retention time, resolution, peak width and symmetry of target carbohydrates. Narrow peaks (wh: 0.2–0.6 min) and good symmetry (As: 0.8–1.4) were obtained for GCO using an acetonitrile:water gradient with 0.1% ammonium hydroxide at 40 ◦C. These conditions were selected to quantify the main oligosaccharides in goat colostrum samples. Values ranging from 140 to 315 mg L−1 for neutral oligosaccharides and from 83 to 251 mg L−1 for acidic oligosaccharides were found. The combination of both techniques resulted to be useful to achieve a comprehensive characterization of GCO.This work has been funded by Junta de Andalucía (project AGR2011-7626), CSIC (project i-link0827), Comunidad Autónoma de Madrid (Spain) and European funding from FEDER program (AVANSECAL-CM S2013/ABI-3028) and Fundación Ramón Areces. This work was also supported by the UC Davis RISE program and the National Institutes of Health awards R21AT006180, R01AT007079, R01AT008759-02.Peer reviewe

Fabricación del electrodo superior en dispositivos moleculares mediante la formación de enlaces covalentes σ C-Au

Resumen del póster presentado a la 6ª Jornada de Jóvenes Investigadores en Física y Química de Aragón celebrada en Zaragoza el 20 de noviembre de 2014.-- et al.Peer reviewe

Colgajo de vasto lateral de pedículo distal para cobertura de lesiones complejas de rodilla

El tratamiento de las heridas complejas articulares se muestra siempre complicado, el abordaje razonable conjunto por traumatólogos y cirujanos plásticos mejora el resultado clínico, funcional y estético. Presentamos el caso de un paciente politraumatizado con pérdida de sustancia a nivel de la rodilla secundaria a artritis séptica, necrosis de patela y exposición de cóndilos femorales que fue tratado mediante colgajo muscular de vastus lateralis de pedículo distal. El vastus lateralis permite la cobertura eficiente de l articulación expuesta sin afectar la extensión de la rodilla y dejando mínima secuela estética.The treatment of the joint complex wounds is difficult. A good clinic, functional and aesthetic outcome is possible when multidisciplinary approach by orthopaedics and plastic surgeons is carried out. We report a case of a patient with multiple fractures who presents a severe loss of soft tissue at the knee. This lesion was due to a septic arthritis with patellar necrosis and condillar exposition. The treatment was made by a distally pedicled vastus lateralis muscular flap. This flap lets efficient coverage for the exposed joint as well as the integrity of the extensión knee function without aesthetic seque

On perfect and quasiperfect domination in graphs

Preprin