Mapping Chestnut Stands Using Bi-Temporal VHR Data

This study analyzes the potential of very high resolution (VHR) remote sensing images and extended morphological profiles for mapping Chestnut stands on Tenerife Island (Canary Islands, Spain). Regarding their relevance for ecosystem services in the region (cultural and provisioning services) the public sector demand up-to-date information on chestnut and a simple straight-forward approach is presented in this study. We used two VHR WorldView images (March and May 2015) to cover different phenological phases. Moreover, we included spatial information in the classification process by extended morphological profiles (EMPs). Random forest is used for the classification process and we analyzed the impact of the bi-temporal information as well as of the spatial information on the classification accuracies. The detailed accuracy assessment clearly reveals the benefit of bi-temporal VHR WorldView images and spatial information, derived by EMPs, in terms of the mapping accuracy. The bi-temporal classification outperforms or at least performs equally well when compared to the classification accuracies achieved by the mono-temporal data. The inclusion of spatial information by EMPs further increases the classification accuracy by 5% and reduces the quantity and allocation disagreements on the final map. Overall the new proposed classification strategy proves useful for mapping chestnut stands in a heterogeneous and complex landscape, such as the municipality of La Orotava, Tenerife

Comparison of fractal dimensions based on segmented NDVI fields obtained from different remote sensors.

Satellite image data have become an important source of information for monitoring vegetation and mapping land cover at several scales. Beside this, the distribution and phenology of vegetation is largely associated with climate, terrain characteristics and human activity. Various vegetation indices have been developed for qualitative and quantitative assessment of vegetation using remote spectral measurements. In particular, sensors with spectral bands in the red (RED) and near-infrared (NIR) lend themselves well to vegetation monitoring and based on them [(NIR - RED) / (NIR + RED)] Normalized Difference Vegetation Index (NDVI) has been widespread used. Given that the characteristics of spectral bands in RED and NIR vary distinctly from sensor to sensor, NDVI values based on data from different instruments will not be directly comparable. The spatial resolution also varies significantly between sensors, as well as within a given scene in the case of wide-angle and oblique sensors. As a result, NDVI values will vary according to combinations of the heterogeneity and scale of terrestrial surfaces and pixel footprint sizes. Therefore, the question arises as to the impact of differences in spectral and spatial resolutions on vegetation indices like the NDVI. The aim of this study is to establish a comparison between two different sensors in their NDVI values at different spatial resolutions

Ab initio studies of ethanol dehydrogenation at binary AuPd nanocatalysts

Producción CientíficaDensity Functional Theory (DFT) simulations have been performed to study ethanol anaerobic oxidation at 10-atom binary gold–palladium clusters with varying compositions, ranging from 0% to 100% gold content. For each case, we have studied the loss of two hydrogen atoms, the desorption of acetaldehyde, and recombination of hydrogen into gas-phase H2. The results show that alloying produces sizable changes in the reaction barriers and in the stability of the intermediate species, which are related to different intrinsic reactivities of palladium and gold.Ministerio de Economía, Industria y Competitividad (Project MAT2014-54378-R)Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. A050U14

Adaptación y validación al español del cuestionario de identificación paliativa SPICT-ESTM

OBJETIVO Adaptar culturalmente al español y validar el SPICTTM, una herramienta breve y sencilla para apoyar una mejor identificación de pacientes crónicos que presentan necesidades de atención paliativa. MÉTODOS Para este estudio se diseñó un proyecto multicéntrico y nacional entre centros de Galicia, Islas Baleares y Andalucía. Para el proceso de traducción y adaptación transcultural del SPICTTM al castellano, se siguieron los pasos propuestos por Beaton et al. con sucesivas traducciones y posterior consenso de expertos mediante la metodología debriefing. Tras finalizar la validación de contenido se procedió a la validación de las propiedades psicométricas. Se diseñó un estudio longitudinal prospectivo en 188 pacientes de Galicia, Baleares y Andalucía. Fue analizada la consistencia interna y la fiabilidad test-retest a los 10 días por el mismo investigador. RESULTADOS A más del 90% de los participantes SPICT-ESTM les parece sencillo cumplimentarlo, y consideran que está escrito en un lenguaje comprensible. El tiempo medio para aplicar el cuestionario sin conocimiento previo fue de 4 minutos y 45 segundos. Para la evaluación de la consistencia interna del instrumento, se ha utilizado la fórmula Kuder Richardson 20. La consistencia interna es de 0,71. El índice de concordancia del test Kappa se encuentra entre 0,983 y 0,797 para los distintos ítems. CONCLUSIONES En este estudio se ha demostrado la equivalencia de contenido con el original. Además, la validación de las propiedades psicométricas establece que SPICT-ESTM mantiene una adecuada fiabilidad y estabilidad. Si añadimos la satisfacción mostrada por los profesionales y la facilidad de uso, SPICT-ESTM es una herramienta adecuada para la identificación de pacientes paliativos con enfermedades crónicas y necesidad de cuidados paliativos.OBJECTIVE To culturally adapt and validate the SPICTTM to Spanish, which is a brief and simple tool to support a better identification of chronic patients who have palliative care needs. METHODS For this study, we designed a multicenter and national project between the centers of Galicia, Balearic Islands, and Andalusia. For the process of translation and cross-cultural adaptation of the SPICTTM to Spanish, we followed the steps proposed by Beaton et al. with successive translations and subsequent consensus of experts using the debriefing methodology. After the content validation was completed, the psychometric properties were validated. A prospective longitudinal study was designed with 188 patients from Galicia, the Balearic Islands, and Andalusia. The internal consistency and reliability of the test and retest was analyzed for 10 days by the same researcher. RESULTS For more than 90% of the participants of the SPICT-ESTM, it seems simple to be filled out, and they consider it written in an understandable language. The average time to apply the questionnaire without prior knowledge was 4 minutes and 45 seconds. To evaluate the internal consistency of the instrument, we used the Kuder-Richardson formula 20. Internal consistency is 0.71. The agreement index of the Kappa test is between 0.983 and 0.797 for the different items. CONCLUSIONS In this study, we demonstrate the equivalence of content with the original. In addition, the validation of the psychometric properties establishes that the SPICT-ESTM maintains adequate reliability and stability. If we add the satisfaction shown by the professionals and the ease of use, the SPICT-ESTM is an adequate tool for the identification of palliative patients with chronic diseases and palliative care needs

Stress compensation by gap monolayers for stacked InAs/GaAs quantum dots solar cells

In this work we report the stacking of 10 and 50 InAs quantum dots layers using 2 monolayers of GaP for stress compensation and a stack period of 18 nm on GaAs (001) substrates. Very good structural and optical quality is found in both samples. Vertical alignment of the dots is observed by transmission electron microscopy suggesting the existence of residual stress around them. Photocurrent measurements show light absorption up to 1.2 μm in the nanostructures together with a reduction in the blue response of the device. As a result of the phosphorus incorporation in the barriers, a very high thermal activation energy (431 meV) has also been obtained for the quantum dot emission

Strain driven migration of In during the growth of InAs/GaAs quantum posts

Using the mechano-optical stress sensor technique, we observe a counter-intuitive reduction of the compressive stress when InAs is deposited on GaAs (001) during the growth of quantum posts. Through modelling of the strain fields, we find that such anomalous behaviour can be related to the strain-driven detachment of In atoms from the crystal and their surface diffusion towards the self-assembled nanostructures.We acknowledge the financial support by Spanish MINECO through Grant Nos. ENE2012-37804-C02-02 and TEC2011-29120-C05-04, and by Spanish CAM through Grant Nos. S2009/ESP-1503 and S2009/ENE-1477.Peer Reviewe

Comparison of NDVI fields obtained from different remote sensors

Satellite image data have become an important source of information for monitoring vegetation and mapping land cover at several scales. Beside this, the distribution and phenology of vegetation is largely associated with climate, terrain characteristics and human activity. Various vegetation indices have been developed for qualitative and quantitative assessment of vegetation using remote spectral measurements. In particular, sensors with spectral bands in the red (RED) and near-infrared (NIR) lend themselves well to vegetation monitoring and based on them [(NIR - RED) / (NIR + RED)] Normalized Difference Vegetation Index (NDVI) has been widespread used. Given that the characteristics of spectral bands in RED and NIR vary distinctly from sensor to sensor, NDVI values based on data from different instruments will not be directly comparable. The spatial resolution also varies significantly between sensors, as well as within a given scene in the case of wide-angle and oblique sensors. As a result, NDVI values will vary according to combinations of the heterogeneity and scale of terrestrial surfaces and pixel footprint sizes. Therefore, the question arises as to the impact of differences in spectral and spatial resolutions on vegetation indices like the NDVI and their interpretation as a drought index. During 2012 three locations (at Salamanca, Granada and Córdoba) were selected and a periodic pasture monitoring and botanic composition were achieved. Daily precipitation, temperature and monthly soil water content were measurement as well as fresh and dry pasture weight. At the same time, remote sensing images were capture by DEIMOS-1 and MODIS of the chosen places. DEIMOS-1 is based on the concept Microsat-100 from Surrey. It is conceived for obtaining Earth images with a good enough resolution to study the terrestrial vegetation cover (20x20 m), although with a great range of visual field (600 km) in order to obtain those images with high temporal resolution and at a reduced cost. By contranst, MODIS images present a much lower spatial resolution (500x500 m). The aim of this study is to establish a comparison between two different sensors in their NDVI values at different spatial resolutions. Acknowledgements. This work was partially supported by ENESA under project P10 0220C-823. Funding provided by Spanish Ministerio de Ciencia e Innovación (MICINN) through project no. MTM2009-14621 and i-MATH No. CSD2006-00032 is greatly appreciated

Late Neanderthal subsistence strategies and cultural traditions in the northern Iberia Peninsula: Insights from Prado Vargas, Burgos, Spain

In order to better understand the causes and geographic patterns of Neanderthal demise it is necessary to broaden the focus of existing Neanderthal studies to include new sites from understudied regions, particularly those containing multi-level fossil and lithic records, and to improve regional-scale Neanderthal extinction frameworks using multiple dating techniques. To this end, we present an interdisciplinary study of the stratigraphy, chronology, pollen, fauna, lithic technology and human remains of the last Neanderthal level (Level N4) of Prado Vargas – a cave in northern Iberia, whose geographic location and chronology are ideal for investigating possible socio-economic and climatic influences on Neanderthal decline. Level N4 has yielded a rich Late Mousterian palimpsest indicative of repeated seasonal occupations, as well as a deciduous Neanderthal tooth, confirming the presence of children at the site. A wide range of human activities are detected in Level 4, with subsistence strategies demonstrating knowledgeable exploitation of the natural environs around the area. The site provides evidence for a distinctive recycling economy, including bone retouchers, recycling of cores, and intense (re)use of raw materials, which may reflect recurrent occupations or the particular cultural traditions of a regional group. Level N4 is dated to between 54.7 and 39.8 thousand years ago (ka) according to our new OSL and radiocarbon study. The late Neanderthal inhabitants of Prado Vargas were cold-adapted, and may have already been living in small, separate groups with marked territories and cultural traditions prior to the arrival of Homo sapiens in the Iberia Peninsula.Consejería de Cultura y Turismo de la Junta de Castilla y León y Ayuntamiento Merindad de Sotoscueva. The C14 dating was funded by Fundación Palarq. The OSL dating research was funded by Australian Research Council (ARC) Discovery Early Career Researcher Award DE160100743 and ARC Future Fellowship project FT200100816 awarded to M. Demuro. Marta Santamaría is the beneficiary of a predoctoral grant from University of Burgos (UBU). Gala Gómez Merino did tasks of cleaning and conservation of the tooth. We are grateful to Fundación La Escuela (Cornejo), Asociación Naboki (Quisicedo), Casa del Parque del Monumento Natural de Ojo Guareña and Benigno Gómez Pereda

Theoretical modelling of quaternary GaInAsSb/GaAs self-assembled quantum dots

Trabajo presentado al "Quantum Dot", celebrado en Nottingham (UK) del 26 al 30 de Abril de 2010.InAs/GaAs quantum dots exposed to Sb after growth exhibit spectral changes. We study in the present paper an idealized nanostructure consisting of a homogeneous distribution of the quaternary GaInAsSb surrounded by a barrier of GaAs. We nd that the valence band o set is a critical parameter in modelling its electronic structure. Depending on this value, we predict a transition from type-I to type-II band alignment at a di erent Sb concentration. The addition of Sb to reduce the transition energy while keeping a type-I alignment is only of bene t at low Sb concentrationThis work was supported by the Spanish MICINN (projects TEC2008-06756-C03-01/02/TEC, CONSOLIDER INGENIO 2010 CSD2006-0019 and CSD2009-00013), the Junta de Andalucía (PAI research groups TEP-120 and TIC-145; project P08-TEP-03516) and Comunidad Autónoma de Madrid S2009ESP-1503.Peer reviewe

Spanish adaptation and validation of the supportive & palliative care indicators tool – SPICT-ES™

OBJETIVO: Adaptar culturalmente al español y validar el SPICTTM, una herramienta breve y sencilla para apoyar una mejor identificación de pacientes crónicos que presentan necesidades de atención paliativa. MÉTODOS: Para este estudio se diseñó un proyecto multicéntrico y nacional entre centros de Galicia, Islas Baleares y Andalucía. Para el proceso de traducción y adaptación transcultural del SPICTTM al castellano, se siguieron los pasos propuestos por Beaton et al. con sucesivas traducciones y posterior consenso de expertos mediante la metodología debriefing. Tras finalizar la validación de contenido se procedió a la validación de las propiedades psicométricas. Se diseñó un estudio longitudinal prospectivo en 188 pacientes de Galicia, Baleares y Andalucía. Fue analizada la consistencia interna y la fiabilidad test-retest a los 10 días por el mismo investigador. RESULTADOS: A más del 90% de los participantes SPICT-ESTM les parece sencillo cumplimentarlo, y consideran que está escrito en un lenguaje comprensible. El tiempo medio para aplicar el cuestionario sin conocimiento previo fue de 4 minutos y 45 segundos. Para la evaluación de la consistencia interna del instrumento, se ha utilizado la fórmula Kuder Richardson 20. La consistencia interna es de 0,71. El índice de concordancia del test Kappa se encuentra entre 0,983 y 0,797 para los distintos ítems. CONCLUSIONES: En este estudio se ha demostrado la equivalencia de contenido con el original. Además, la validación de las propiedades psicométricas establece que SPICT-ESTM mantiene una adecuada fiabilidad y estabilidad. Si añadimos la satisfacción mostrada por los profesionales y la facilidad de uso, SPICT-ESTM es una herramienta adecuada para la identificación de pacientes paliativos con enfermedades crónicas y necesidad de cuidados paliativos.OBJECTIVE: To culturally adapt and validate the SPICTTM to Spanish, which is a brief and simple tool to support a better identification of chronic patients who have palliative care needs. METHODS: For this study, we designed a multicenter and national project between the centers of Galicia, Balearic Islands, and Andalusia. For the process of translation and cross-cultural adaptation of the SPICTTM to Spanish, we followed the steps proposed by Beaton et al. with successive translations and subsequent consensus of experts using the debriefing methodology. After the content validation was completed, the psychometric properties were validated. A prospective longitudinal study was designed with 188 patients from Galicia, the Balearic Islands, and Andalusia. The internal consistency and reliability of the test and retest was analyzed for 10 days by the same researcher. RESULTS: For more than 90% of the participants of the SPICT-ESTM, it seems simple to be filled out, and they consider it written in an understandable language. The average time to apply the questionnaire without prior knowledge was 4 minutes and 45 seconds. To evaluate the internal consistency of the instrument, we used the Kuder-Richardson formula 20. Internal consistency is 0.71. The agreement index of the Kappa test is between 0.983 and 0.797 for the different items. CONCLUSIONS: In this study, we demonstrate the equivalence of content with the original. In addition, the validation of the psychometric properties establishes that the SPICT-ESTM maintains adequate reliability and stability. If we add the satisfaction shown by the professionals and the ease of use, the SPICT-ESTM is an adequate tool for the identification of palliative patients with chronic diseases and palliative care needs