Superconducting density of states at the border of an amorphous thin film grown by focused-ion-beam

We present very low temperature Scanning Tunneling Microscopy and Spectroscopy (STM/S) measurements of a W based amorphous thin film grown with focused-ion-beam. In particular, we address the superconducting properties close to the border, where the thickness of the superconducting film decreases, and the Au substrate emerges. When approaching the Au substrate, the superconducting tunneling conductance strongly increases around the Fermi level, and the quasiparticle peaks do not significantly change its position. Under magnetic fields, the vortex lattice is observed, with vortices positioned very close to the Au substrate.Comment: To appear in Journal of Physics: Conference serie

Relationship between physical fitness and mental heath in primary school children.

ABSTRACT There is scientific evidence that physical fitness is a biological marker of health. The aim of this study was to analyze the relationship between physical fitness and state weight with mental health in primary school children from the southeast of Span. An cross sectional design was implemented, evaluating handgrip strength, explosive lower body strength, aerobic capacity and speed-agility through ALPHA-fitness test battery of a sample of 214 students between 8 and 11 years. The analysis of simple variance showed that physical fitness and state weight is not associated significantly with the mental health. The results indicate that physical fitness and state weight is not a differentiator of mental health in school children from the southeast of Spain. Keywords: health, physical exercise, children.Existen evidencias científicas de que la condición física es un marcador biológico de la salud. El objetivo fue analizar la relación de la condición física y el estado de peso con la salud mental en escolares de primaria del sureste español. Diseño descriptivo transversal donde se evaluó la condición física mediante la Batería ALPHA-fitness, a una muestra de 214 escolares entre 8 y 11 años. El índice de masa corporal fue categorizado siguiendo criterios estándar. La salud mental fue medida a través del General Health Questionnaire. El análisis de la varianza simple mostró que la condición física y el estado de peso no se asocian significativamente con la salud mental. Los resultados indican que la condición física y el estado de peso no constituyen elementos diferenciadores de la salud mental en escolares de 8 a 11 años del sureste español

Magnetic and superconducting phase diagrams in ErNi2B2C

We present measurements of the superconducting upper critical field Hc2(T) and the magnetic phase diagram of the superconductor ErNi2B2C made with a scanning tunneling microscope (STM). The magnetic field was applied in the basal plane of the tetragonal crystal structure. We have found large gapless regions in the superconducting phase diagram of ErNi2B2C, extending between different magnetic transitions. A close correlation between magnetic transitions and Hc2(T) is found, showing that superconductivity is strongly linked to magnetism.Comment: 5 pages, 4 figure

Scanning tunneling spectroscopy of layers of superconducting 2H-TaSe2_\textbf{2}: Evidence for a zero bias anomaly in single layers

We report a characterization of surfaces of the dichalcogenide TaSe$_2$ using scanning tunneling microscopy and spectroscopy (STM/S) at 150 mK. When the top layer has the 2H structure and the layer immediately below the 1T structure, we find a singular spatial dependence of the tunneling conductance below 1 K, changing from a zero bias peak on top of Se atoms to a gap in between Se atoms. The zero bias peak is additionally modulated by the commensurate $3a_0 \times 3a_0$ charge density wave of 2H-TaSe$_2$. Multilayers of 2H-TaSe$_2$ show a spatially homogeneous superconducting gap with a critical temperature also of 1 K. We discuss possible origins for the peculiar tunneling conductance in single layers.Comment: 10 pages, 10 figure

Caractérisation d’equipes de réception et software de simulation

L’objectif de ce chapitre est la maîtrise du logiciel de réception IZT R3301 de la compagnie e Innovationszentrum fuer Telekommunikationstechnik GmbH IZT. On commence par la description des caractéristiques de l’appareil, pour finalement faire un petit manuel d’utilisateur. Après des expérimentations réalisés sur les différents logiciels présents dans la salle de travaille « Tannenbaum », on conclut que la salle est parfaitement équipée pour l’étude et la compréhension des concepts sur les antennes appris par les étudiants sur les différents cours. Sans doute, la plus complète caractérisation des paramètres des antennes peut être mise en ouvre par l’analyseur vectoriel de signal E4406A de la compagnie Agilent Technologies. Étant donné que ce logiciel peut mesurer aussi des communications GSM, qui fait peu utile le logiciel MT8801B de la compagnie Anritsu, qui travaille exclusivement avec ce type des communications. Par ailleurs, les simulateurs employés sont de très utilité pour l’adaptation des systèmes de communication et pour le design des antennes. Cependant, pour le logiciel High Frequency Structural Simulator (HFSS), il est nécessaire une maitrise du logiciel très avancé pour le niveau des étudiants. Par conséquence, on recommande l’ouverture directe des projets déjà faits et le travail sur les simulations, plus intuitives pour travailler avec. On espère qu’avec la réalisation des différents manuels et les projets sur les simulateurs, l’acquisition et assimilation des connaissances des antennes et systemes d’adaptations soient plus faciles et rapides pour les étudiants.Escuela Técnica Superior de Ingeniería de TelecomunicaciónUniversidad Politécnica de Cartagen

Comparative Life Cycle Assessment of gypsum plasterboard and a new kind of bio-based epoxy composite containing different natural fibers

[DE] A comparative LCA from cradle to grave between traditional plasterboard, for drywall applications, and different composite boards, made by natural fiber and a bio-based epoxy resin (Supersap CLR), was carried out. The goal of the study was to determine whether the composites based on such a resin combined with natural fibers could be an eco-friendly alternative to plasterboard in the building sector. Moreover, the impacts related to each of the fibers used are also assessed separately from cradle to gate in order to get a better understanding of its influence. Both the results obtained through the IPC. GWP 100a method and the recipe endpoint show a remarkable difference between the plasterboard and all the different composites, the composites offering a 50% reduction in the CO2 emissions. The calculations performed regarding the impacts related to the different fibers showed only small differences between them.The authors gratefully thank the Spanish Ministry of Economy, Industry and Competitiveness, for funding the project BIA2013-41537-R (BIAEFIREMAT 'Development of new sustainable eco-materials and building systems for the building industry, based on the use of residues and renewable raw materials'). The project is co-funded by the European Regional Development Fund and it is included in the R+D National Programme for Research Aimed at the Challenges of Society.Quintana, A.; Alba Fernández, J.; Rey Tormos, RMD.; Guillén Guillamón, IE. (2018). Comparative Life Cycle Assessment of gypsum plasterboard and a new kind of bio-based epoxy composite containing different natural fibers. Journal of Cleaner Production. 185:408-420. https://doi.org/10.1016/j.jclepro.2018.03.042S40842018

Relación entre condición física y salud mental en escolares de primaria

There is scientific evidence that physical fitness is a biological marker of health. The aim of this study was to analyze the relationship between physical fitness and state weight with mental health in primary school children from the southeast of Span. An cross sectional design was implemented, evaluating handgrip strength, explosive lower body strength, aerobic capacity andspeed-agility through ALPHA-fitness test battery of a sample of 214 students between 8 and 11 years. The analysis of simple variance showed that physical fitness and state weightis not associated significantly with the mental health.The results indicate that physical fitness and state weightis not a differentiatorof mental health in school children from the southeast of Spain.Existen evidencias científicas de que la condición física es un marcador biológico de la salud. El objetivo fue analizar la relación de la condición física y el estado de peso con la salud mental en escolares de primaria del sureste español. Diseño descriptivo transversal donde se evaluó la condición física mediante la Batería ALPHA-fitness, a una muestra de 214 escolares entre 8 y 11 años. El índice de masa corporal fue categorizado siguiendo criterios estándar. La salud mental fue medida a través del General Health Questionnaire.El análisis de la varianza simple mostró que la condición física y el estado de peso no se asocian significativamente con la salud mental.Los resultados indican que la condición física y el estado de peso no constituyen elementos diferenciadores de la salud mental en escolares de 8 a 11 años del sureste español

Subsurface bending and reorientation of tilted vortex lattices in bulk isotropic superconductors due to Coulomb-like repulsion at the surface

We study vortex lattices (VLs) in superconducting weak-pinning platelet-like single crystals of β-Bi2Pd in tilted magnetic fields with a scanning tunneling microscope. We show that vortices exit the sample perpendicular to the surface and are thus bent beneath the surface. The structure and orientation of the tilted VLs in the bulk are, for large tilt angles, strongly affected by Coulomb-type intervortex repulsion at the surface due to stray magnetic fieldsThe authors are grateful to P. C. Canfield for discussions, for having proposed the growth of single crystals of β-Bi2 Pd, and for having shown how to do that. E.H. was supported by the Departamento Administrativo de Ciencia, Tecnología e Innovación, COLCIENCIAS (Colombia) Programa Doctorados en el Exterior Convocatoria Program No. 568-2012 and the Universidad Nacional de Colombia, División de Investigación y Extensión sede Bogotá (DIEB) Project No. 35615. I.G. was supported by the ERC (Grant Agreement No. 679080 and the Ramón y Cajal Program through Grant No. RyC-2014-15093). This work also was supported by the Spanish MINECO (Grants No. FIS2014-54498-R and No. MAT2014-52405-C2-02), by the Comunidad de Madrid through Program NANOFRONTMAG-CM (Program No. S2013/MIT-2850), and by Axa Research Funds. We also acknowledge the SEGAINVEX workshop of UAM, Banco Santander and COST Grant No. CA16128 action, the EU through Grant Agreements No. FP7-PEOPLE-2013-CIG 618321 and No. 604391, and Nanopyme Grant No. FP7-NMP-2012-SMALL-6 NMP3-SL 2012-310516. V.G.K. was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The Ames Laboratory is operated for the U.S. DOE by Iowa State University under Contract No. DE-AC02-07CH1135