On the q=1/2 non-extensive maximum entropy distribution

A detailed mathematical analysis on the q = 1/2 non-extensive maximum entropydistribution of Tsallis' is undertaken. The analysis is based upon the splitting of such adistribution into two orthogonal components. One of the components corresponds to theminimum norm solution of the problem posed by the fulfillment of the a priori conditionson the given expectation values. The remaining component takes care of the normalizationconstraint and is the projection of a constant onto the Null space of the "expectation-values-transformation"

A non-extensive maximum entropy based regulations method for bad conditioned inverse problems

A regularization method based on the non-extensive maximum entropy principle is devised. Special emphasis is given to the q=1/2 case. We show that, when the residual principle is considered as constraint, the q=1/2 generalized distribution of Tsallis yields a regularized solution for bad-conditioned problems. The so devised regularized distribution is endowed with a component which corresponds to the well known regularized solution of Tikhonov (1977).

Mulching as an alternative technique for weed management in mandarine orchard tree rows

Peer reviewed

Frames: a maximum entropy statistical estimate of the inverse problem

A maximum entropy statistical treatment of an inverse problem concerning frame theory is presented. The problem arises from the fact that a frame is an overcomplete set of vectors that defines a mapping with no unique inverse. Although any vector in the concomitant space can be expressed as a linear combination of frame elements, the coefficients of the expansion are not unique. Frame theory guarantees the existence of a set of coefficients which is “optimal” in a minimum norm sense. We show here that these coefficients are also “optimal” from a maximum entropy viewpoint.

Poly(beta,L-malic acid)Doxorubicin ionic complex: A pH-dependent delivery system.

Poly(ß,L-malic acid) (PMLA) was made to interact with the cationic anticancer drug Doxorubicin (DOX) in aqueous solution to form ionic complexes with different compositions and an efficiency near to 100%. The PMLA/DOX complexes were characterized by spectroscopy, thermal analysis, and scanning electron microscopy. According to their composition, the PMLA/DOX complexes spontaneously self-assembled into spherical micro or nanoparticles with negative surface charge. Hydrolytic degradation of PMLA/DOX complexes took place by cleavage of the main chain ester bond and simultaneous release of the drug. In vitro drug release studies revealed that DOX delivery from the complexes was favored by acidic pH and high ionic strength

Eficàcia d'un biopreparat de microorganismes nadius de muntanya sobre el nematode Meloidogyne javanica en cultiu de tomàquet

Es va determinar l’efecte nematicida d’un biopreparat fet a partir de material de mantell de bosc autòcton, tècnica coneguda com a Activació de Microorganismes de Muntanya, sobre una població de Meloidogyne javanica, en cultiu de tomàquet cv. Durinta, en condicions de semicamp i sota hivernacle. Es van realitzar 5 aplicacions de biopreparat actiu (MMactivat) i el mateix biopreparat esterilitzat en autoclau (MMautoclavat) en un volum d’1L de sorra de riera autoclavada a raó de 8,4 mL per planta. La primera aplicació es va fer just desprès de trasplantar el conreu i una setmana abans d’inocular 1 J2·cm-3 de sòl, i els quatre tractaments restants amb cadència setmanal. Paral·lelament, es va determinar les unitats formadores de colònia de fongs i bacteris del biopreparat actiu i esterilitzat, així com la presència de coliformes fecals. Al final de l’assaig, desprès que el nematode completés una generació, es va avaluar el pes sec aeri i el pes fresc de les arrels, el nombre d’ous per planta, i la freqüència d’aïllament de fongs endòfits d’arrel i tija de tomaquera. El pH del biopreparat era de 3,7. Les mostres contenien nivells superiors a 107 UFC ml-1 tant de fongs com de bactèries. No es va detectar la presència de coliformes totals obtenint un valor < 3 NMP/mL amb p≤0,05. No es van aïllar colònies de bacteris termodúrics ni de Pseudomonas aureginosa ni P. fluorescens que poguessin actuar com a organismes de control biològic. El biopreparat no va mostrar cap efecte sobre el desenvolupament aeri i radicular de la planta. La producció d’ous en les plantes tractades amb el biopreparat actiu i esterilitzat va ser un 63% i un 67% menor que en el testimoni sense tractar. Es van detectar fongs endòfits en arrel i tija de tomaquera en la majoria de les mostres sense atendre a cap tractament, inclòs el control sense tractar.

Cardiac tissue engineering by electrical stimulation with subcutaneous and cardiac adipose-tissue derived progenitor cells (ATDPCs)

A major challenge of cardiac tissue engineering is directing cells to establish the physiological structure and function of the myocardium being replaced. In native heart, pacing cells generate electrical stimuli that spread throughout the heartcausing cell membrane depolarization and activation of contractile apparatus. We ought to examine whether electricalstimulation of adipose tissue-derived progenitor cells (ATDPCs) exerts phenotypic and genetic changes that enhance theircardiomyogenic potential.

Influence of baffles and fish presence in the velocities distribution of a multivortex tank

Postprint (published version)

Analysis of resuspension and sedimentation processes of unaltered fish faeces using image analysis

Postprint (published version)

Aquaculture production in areas with high seasonal temperature variations: Development of planning tools

Postprint (published version)

Nanoantenna enhanced emission of lightharvesting complex 2: the role of resonance, polarization, and radiative and non-radiative rates

Nanoantennae show potential for photosynthesis research for two reasons; first by spatially confining light for experiments which require high spatial resolution, and second by enhancing the photon emission of single light-harvesting complexes. For effective use of nanoantennae a detailed understanding of the interaction between the nanoantenna and the light-harvesting complex is required. Here we report how the excitation and emission of multiple purple bacterial LH2s (light-harvesting complex 2) are controlled by single gold nanorod antennae. LH2 complexes were chemically attached to such antennae, and the antenna length was systematically varied to tune the resonance with respect to the LH2 absorption and emission. There are three main findings. (i) The polarization of the LH2 emission is fully controlled by the resonant nanoantenna. (ii) The largest fluorescence enhancement, of 23 times, is reached for excitation with light at λ = 850 nm, polarized along the long antenna-axis of the resonant antenna. The excitation enhancement is found to be 6 times, while the emission efficiency is increased 3.6 times. (iii) The fluorescence lifetime of LH2 depends strongly on the antenna length, with shortest lifetimes of [similar]40 ps for the resonant antenna. The lifetime shortening arises from an 11 times resonant enhancement of the radiative rate, together with a 2–3 times increase of the non-radiative rate, compared to the off-resonant antenna. The observed length dependence of radiative and non-radiative rate enhancement is in good agreement with simulations. Overall this work gives a complete picture of how the excitation and emission of multi-pigment light-harvesting complexes are influenced by a dipole nanoantenna.

Non aerated seaweed culture tank with rotating flow

Postprint (published version)

Process variability-aware proactive reconfiguration technique for mitigating aging effects in nanos scale SRAM lifetime

Postprint (published version)

Design and evaluation of learning algorithms for dynamic resource management in virtual networks

Network virtualisation is considerably gaining attentionas a solution to ossification of the Internet. However, thesuccess of network virtualisation will depend in part on how efficientlythe virtual networks utilise substrate network resources.In this paper, we propose a machine learning-based approachto virtual network resource management. We propose to modelthe substrate network as a decentralised system and introducea learning algorithm in each substrate node and substrate link,providing self-organization capabilities. We propose a multiagentlearning algorithm that carries out the substrate network resourcemanagement in a coordinated and decentralised way. The taskof these agents is to use evaluative feedback to learn an optimalpolicy so as to dynamically allocate network resources to virtualnodes and links. The agents ensure that while the virtual networkshave the resources they need at any given time, only the requiredresources are reserved for this purpose. Simulations show thatour dynamic approach significantly improves the virtual networkacceptance ratio and the maximum number of accepted virtualnetwork requests at any time while ensuring that virtual networkquality of service requirements such as packet drop rate andvirtual link delay are not affected.

Introducción a las infraestructuras de datos espaciales

Este libro «Introducción a las Infraestructuras de Datos Espaciales» se plantea con esta finalidad, eminentemente didáctica, para explicar qué es una infraestructura de datos espaciales, qué aporta sobre, y como complementa a, los sistemas de información geográfica y, sobre todo, las bases tecnológicas, normativas y de especificaciones en las que se asienta. ...