The Hierarchy Principle and the Large Mass Limit of the Linear Sigma Model

In perturbation theory we study the matching in four dimensions between the linear sigma model in the large mass limit and the renormalized nonlinear sigma model in the recently proposed flat connection formalism. We consider both the chiral limit and the strong coupling limit of the linear sigma model. Our formalism extends to Green functions with an arbitrary number of pion legs,at one loop level,on the basis of the hierarchy as an efficient unifying principle that governs both limits. While the chiral limit is straightforward, the matching in the strong coupling limit requires careful use of the normalization conditions of the linear theory, in order to exploit the functional equation and the complete set of local solutions of its linearized form.Comment: Latex, 41 pages, corrected typos, final version accepted by IJT

Functionalizing Ti-Surfaces through the EPD of Hydroxyapatite/NanoY₂O₃

Ceramic materials for skeletal repair and reconstruction are expanding to a number of different applications. Present research is addressing new compositions and performances to promote osseo-integration through metal coatings. Nanotechnology plays a key role in this research because nanostructures can be introduced into implants to functionalize them and/or to enhance their properties, such as the thermal or mechanical response. In this work, the insertion of Y₂O₃ nanoparticles into a hydroxyapatite (HA) coating of Ti using colloidal processing technology was developed. The suspensions of HA and Y₂O₃ nanoparticles were formulated with a focus on zeta potential, particle size distribution, and viscosity for the codeposition of both phases by electrophoresis. The microstructure of the nanocomposite coating was optimized by adjusting the main parameters of the electrophoretic deposition process. A threshold value of the applied electric field for the composite shaping was identified. The results demonstrate that the Y₂O₃ nanoparticles are homogeneously distributed in the coating and decrease in concentration as the distance from the substrate increases. As a consequence of the presence of the Y₂O₃, delays in the HA thermal decomposition and the improvement of metal–ceramic joining were observed.This work has been supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under contracts MAT2009 14448 C02 01, MAT2012 38650 C02 02, and IPT 310000 2010 12

Biogas production by anaerobic codigestion using kiwi waste and wine sludge

Considering a large generation of wastes, the anaerobic codigestion (AcoD) is an alternative to transform two or more types of organic waste in energy and biofertilizer. To test the biogas production potential using kiwi waste and wine sludge, two AD assays with each substrate isolated and AcoD with four different substrate proportion was realized, using as inoculum sludge from a septic tank. The experimental was realized during 19 days in batch reactor (250 mL). Among digestion results, kiwi waste had de best result, being 27.0 mLN gVS-1 of biogas. The most satisfactory value in AcoD was 40.5 mLN g VS-1 of biogas, from treatment with 0.5 g kiwi and 3.3 g wine sludge. The AcoD test produced 16 mLN gVS-1 of biogas more than ADinfo:eu-repo/semantics/publishedVersio

Selective extraction of intracellular components from the microalga Chlorella vulgaris by combined pulsed electric field–temperature treatment

Author's accepted version (post-print).Available from 16/12/2017

Flux-noise spectra around the Kosterlitz-Thouless transition for two-dimensional superconductors

The flux-noise spectra around the Kosterlitz-Thouless transition are obtained from simulations of the two-dimensional resistively shunted junction model. In particular the dependence on the distance $d$ between the pick-up coil and the sample is investigated. The typical experimental situation corresponds to the large-$d$ limit and a simple relation valid in this limit between the complex impedance and the noise spectra is clarified. Features, which distinguish between the large- and small-$d$ limit, are identified and the possibility of observing these features in experiments is discussed.Comment: 12 pages including 8 figures, submitted to Phys. Rev.

Low noise amplication of an optically carried microwave signal: application to atom interferometry

In this paper, we report a new scheme to amplify a microwave signal carried on a laser light at $\lambda$=852nm. The amplification is done via a semiconductor tapered amplifier and this scheme is used to drive stimulated Raman transitions in an atom interferometer. Sideband generation in the amplifier, due to self-phase and amplitude modulation, is investigated and characterized. We also demonstrate that the amplifier does not induce any significant phase-noise on the beating signal. Finally, the degradation of the performances of the interferometer due to the amplification process is shown to be negligible

Low energy collective excitations in a superfluid trapped Fermi gas

We study low energy collective excitations in a trapped superfluid Fermi gas, that describe slow variations of the phase of the superfluid order parameter. Well below the critical temperature the corresponding eigenfrequencies turn out to be of the order of the trap frequency, and these modes manifest themselves as the eigenmodes of the density fluctuations of the gas sample. The latter could provide an experimental evidence of the presence of the superfluid phase.Comment: 5 pages, REVTeX, referencies correcte

Coulomb Effects on Electromagnetic Pair Production in Ultrarelativistic Heavy-Ion Collisions

We discuss the implications of the eikonal amplitude on the pair production probability in ultrarelativistic heavy-ion transits. In this context the Weizs\"acker-Williams method is shown to be exact in the ultrarelativistic limit, irrespective of the produced particles' mass. A new equivalent single-photon distribution is derived which correctly accounts for the Coulomb distortions. As an immediate application, consequences for unitarity violation in photo-dissociation processes in peripheral heavy-ion encounters are discussed.Comment: 13 pages, 4 .eps figure

La prescripción electrónica asistida: instrumento clave para la disminución de los problemas relacionados con los medicamentos en el hospital

Objetivo: Evaluar el efecto de la implantación de la prescripción electrónica asistida (PEA) en una unidad clínica sobre los problemas relacionados con los medicamentos (PRM) y sobre el grado de aceptación de las intervenciones farmacéuticas. Métodos: Estudio prospectivo, casi experimental. Se revisaron las prescripciones farmacológicas de un servicio de medicina interna durante dos periodos secuenciales de 3,5 meses cada uno (antes y después de la implantación de la PEA). Se registraron todos los PRM detectados en ambas fases. Se analizó también la aceptación de la intervención farmacéutica ante cada error. Resultados: Durante los 7 meses del estudio se detectaron un total de 4.023 PRM, 3.785 en la fase de prescripción manual (PM) y 238 en la fase de PEA; la tasa de PRM por paciente ingresado era de 16,9 en PM y de 1,07 en PEA, lo que supone una reducción estadísticamente significativa del 93,67%. Si omitimos los PRM de identificación de la orden médica, se obtiene una reducción del 43,21%. Con la introducción de la PEA, desaparecieron los PRM de identificación de la orden médica y de transcripción en farmacia, disminuyeron los de dosis no adecuada, duración no adecuada e interacciones, y aumentaron los de error en la identificación del medicamento. Conclusiones: La implantación de la PEA ha disminuido de forma significativa la tasa total de PRM y la de PRM de importancia mayor. La proporción de intervenciones farmacéuticas no contestadas por el médico ha disminuido significativamente

Gravitational-wave Detection With Matter-wave Interferometers Based On Standing Light Waves

We study the possibility of detecting gravitational-waves with matter-wave interferometers, where atom beams are split, deflected and recombined totally by standing light waves. Our calculation shows that the phase shift is dominated by terms proportional to the time derivative of the gravitational wave amplitude. Taking into account future improvements on current technologies, it is promising to build a matter-wave interferometer detector with desired sensitivity.Comment: 7 pages, 3 figures. To be published in General Relativity and Gravitatio