Non-equilibrium thermodynamics, heat transport and thermal waves in laminar and turbulent superfluid helium

This review paper puts together some results concerning non equilibrium thermodynamics and heat transport properties of superfluid He II. A one-fluid extended model of superfluid helium, which considers heat flux as an additional independent variable, is presented, its microscopic bases are analyzed, and compared with the well known two-fluid model. In laminar situations, the fundamental fields are density, velocity, absolute temperature, and heat flux. Such a theory is able to describe the thermomechanical phenomena, the propagation of two sounds in liquid helium, and of fourth sound in superleak. It also leads in a natural way to a two-fluid model on purely macroscopical grounds and allows a small amount of entropy associated with the superfluid component.Other important features of liquid He II arise in rotating situations and in superfluid turbulence, both characterized by the presence of quantized vortices (thin vortex lines whose circulation is restricted by a quantum condition). Such vortices have a deep influence on the transport properties of superfluid helium, as they increase very much its thermal resistance. Thus, heat flux influences the vortices which, in turn, modify the heat flux. The dynamics of vortex lines is the central topic in turbulent superfluid helium. \The model is generalized to take into account the vortices in different cases of physical interest: rotating superfluids, counterflow superfluid turbulence, combined counterflow and rotation, and mass flow in addition to heat flow. To do this, the averaged vortex line density per unit volume L, is introduced and its dynamical equations are considered. Linear and non-linear evolution equations for L are written for homogeneous and inhomogeneous, isotropic and anisotropic situations. Several physical experiments are analyzed and the influence of vortices on the effective thermal conductivity of turbulent superfluid helium is found.Transitions from laminar to turbulent flows, from diffusive to ballistic regimes, from isotropic to anisotropic situations, are analyzed, thus providing a wide range of practical applications. Besides the steady-state effective thermal conductivity, the propagation of harmonic waves is also studied, motivated by the fact that vortex line density is experimentally detected via the attenuation of second sound and because it provides dynamical information on heat transport and thermal waves which complement the static information of the thermal conductivity. (C) 2017 Elsevier B.V. All rights reserved

Distributed Randomized Algorithms for Low-Support Data Mining

Data mining in distributed systems has been facilitated by using high-support association rules. Less attention has been paid to distributed low-support/high-correlation data mining. This has proved useful in several fields such as computational biology, wireless networks, web mining, security and rare events analysis in industrial plants. In this paper we present distributed versions of efficient algorithms for low-support/high-correlation data mining such as Min-Hashing, K-Min-Hashing and Locality-Sensitive-Hashing. Experimental results on real data concerning scalability, speed-up and network traffic are reported

Frame Embeddings for Event-Based Knowledge Reconciliation

This paper focuses on reconciling knowledge graphs generated from two text documents about similar events described differently. The proposed approach employs and extends MERGILO, a tool for reconciling knowledge graphs extracted from text, using word similarity and graph alignment. Our approach effectively handles events using Frame Embeddings and Frame Based Similarities. It is evaluated over a coreference resolution task

A set-cover-based approach for inexact graph matching

Network querying is a growing domain with vast applications ranging from screening compounds against a database of known molecules to matching subnetworks across species. Graph indexing is a powerful method for searching for queries in a large database of graphs. Most graph indexing methods to date tackle the exact matching (isomorphism) problem, limiting their applicability to speci\uafc instances in which such matches exist. Here we provide a novel graph indexing method to cope with the more general, inexact matching problem. Our method, SIGMA, builds on approximating a new variant of the set-cover problem that concerns overlapping multi-sets. We extensively test our method and compare it to a layman approach and to the state-of-the-art Grafil. We show that SIGMA outperforms both, providing higher pruning power in all the tested scenarios

Evaluation of diastolic function by the Tissue doppler in children affected by non- compaction

The Tissue doppler analysis is a new echocardiographic approach to evaluate the diastolic function. In this report we performed a Tissue doppler analysis in a series of 15 children affected by non-compaction. The bidimensional echo-cardiogram showed a systolic function which was reduced only in 8 patients. Alterations of the diastolic function were founded in 7 patients: in 2 cases, a reduction of the E tissue wave was present in all segments. In 3 patients the diastolic dysfunction was limited to apical and lateral segments. In the last 2 children a reduction of the E wave interested only the apical segments. There was a strong correlation between systolic and diastolic dysfunction: in fact all patients with diastolic dysfunction also presented a severe reduction of the systolic function

miRScape: A Cytoscape Plugin to Annotate Biological Networks with microRNAs

In the last years there has been an increasing interest in the mining of biological networks involving miRNAs. Recent works about the function of miRNAs have proved the existence of functional interactions between them and interesting properties which characterize these networks have been deducted. miRScape is the first Cytoscape plugin to mining on biological networks annotated with microRNAs. Cytoscape is a bioinformatics software platform for the visualization and analysis of biological networks. It makes use of a web-based knowledge base called miRo\u2019, which introduce a new layer of associations between genes and phenotypes based on miRNAs annotations. Given a network, previously loaded into Cytoscape, miRScape allows to identify relationships among genes, processes, functions and diseases at the miRNA level and annotate them as attributes of network nodes. These annotated networks may be further analyzed by using mining features available as plug-ins on Cytoscape

La Biblioteca-Archivo de la Escuela de Estudios Árabes, un servicio con proyección cultural y educativa

Sección especial para la "Home" de la Web de la Red de Bibliotecas y Archivos del CSIC para dar a conocer de manera visual y textual aspectos representativos de las bibliotecas y archivos que constituyen la Red CSICTener como sede la Casa morisca del Chapiz, monumento del siglo XVI cuyo origen remontan algunos especialistas al período nazarí, convierte a la Escuela de Estudios Árabes del CSIC en un instituto de investigación de indudable singularidad. Excepcionales son también el Albaicín, barrio en el que está enclavada, su entorno paisajístico y patrimonial, frente a la Alhambra y la propia ciudad de Granada en la que todos ellos se asientan. No hay mejores elementos para enmarcar las actividades científicas que en él se desarrollan: la historia de al-Andalus y de sus textos, la arqueología y la arquitectura Islámicas.N