Dynamical theory of superfluidity in one dimension

A theory accounting for the dynamical aspects of the superfluid response of one dimensional (1D) quantum fluids is reported. In long 1D systems the onset of superfluidity is related to the dynamical suppression of quantum phase slips at low temperatures. The effect of this suppression as a function of frequency and temperature is discussed within the framework of the relevant correlation function that is accessible experimentally, namely the momentum response function. Application of these results to the understanding of the superfluid properties of helium confined in nanometer-size pores, edge dislocations in solid $^4$He, and ultra-cold atomic gases is also briefly discussed.Comment: 4.4 pages, 2 eps figures, and 1 page of supplementary informatio

Direct numerical method for counting statistics in stochastic processes

We propose a direct numerical method to calculate the statistics of the number of transitions in stochastic processes, without having to resort to Monte Carlo calculations. The method is based on a generating function method, and arbitrary moments of the probability distribution of the number of transitions are in principle calculated by solving numerically a system of coupled differential equations. As an example, a two state model with a time-dependent transition matrix is considered and the first, second and third moments of the current are calculated. This calculation scheme is applicable for any stochastic process with a finite state space, and it would be helpful to study current statistics in nonequilibrium systems.Comment: 8 pages, 2 figure

Limited aggregation and zoonotic disease outbreaks

Human and animal interests are often in conflict. In many situations, however, it is unclear how to evaluate and weigh competing human and animal interests, as the satisfaction of the interests of one group often inevitably occurs at the expense of those of the other group. Human-animal conflicts of this kind give rise to ethical questions. If animals count morally for their own sake, then we must ask in which cases the satisfaction or frustration of the interests of humans and animals in conflict situations is justified or unjustified from an ethical perspective. In this article, we argue that limited aggregation accounts represent a promising means for resolving interspecies conflicts. The reason for this is that they can appropriately consider the qualitativerelevance of interests, their relativeimportance to each other, and the number of individuals affected. For our argument, we start from the premise that animals count morally for their own sake, albeit to a lesser extent than humans. That is, we accept the view that animals may be used, for example, as a source of food or in animal research. However, as we will show, many basic interests of animals are sufficiently similar to human interests and can thus be compared to them. Hence, they ought to be aggregated in cases of conflict with human interests. We illustrate our account and its practical implications with the real-world example of a human-animal conflict during the outbreak of a zoonotic diseases among farmed animals. We conclude that, in many cases, animal interests ought to be given more importance than they currently receive, which includes distributing the burdens and risks of farming practices more fairly

Generating low-dimensional denoised representations of nonlinear data with superparamagnetic agents

Copyright ©2016 IEICEVisualisation of high-dimensional data by means of a low-dimensional embedding plays a key role in explorative data analysis. Classical approaches to dimensionality reduction, such as principal component analysis (PCA) and multidimensional scaling (MDS), struggle or even fail to reveal the relevant data characteristics when applied to noisy or nonlinear data structures. We present a novel approach for dimensionality reduction in combination with an automatic noise cleaning. By employing self-organising agents that are governed by the dynamics of the superparamagnetic clustering algorithm, the method is able to generate denoised low-dimensional embeddings for which the characteristics of nonlinear data structures are preserved or even emphasised. These properties are illustrated and compared to other approaches by means of toy and real-world examples

Radiation environment along the INTEGRAL orbit measured with the IREM monitor

The INTEGRAL Radiation Environment Monitor (IREM) is a payload supporting instrument on board the INTEGRAL satellite. The monitor continually measures electron and proton fluxes along the orbit and provides this information to the spacecraft on board data handler. The mission alert system broadcasts it to the payload instruments enabling them to react accordingly to the current radiation level. Additionally, the IREM conducts its autonomous research mapping the Earth radiation environment for the space weather program. Its scientific data are available for further analysis almost without delay.Comment: 5 pages, 7 figures, accepted for publication in A+A letter

From country to town. Changes in rural families lifestyles

La localidad de San Jerónimo Norte se encuentra en el departamento Las Colonias, en la provincia de Santa Fe. En esta área se ha practicado históricamente la explotación tambera. Sin embargo en las últimas décadas diversos factores, como ser los modelos de desarrollo económico y el paradigma de los agronegocios, dieron cabida a una transformación de la estructura de la producción en las zonas rurales. A raíz de este proceso se cerraron una gran cantidad de pequeñas explotaciones tamberas de tipo familiar. El objetivo del trabajo es analizar el cambio en los estilos de vida de una de estas familias tamberas con el paso de la vida rural a la vida urbana. Se ha trabajado con el método cualitativo de las historias de vida.San Jerónimo Norte is located in Las Colonias department, in Santa Fe province. In this area, dairy industry exploitation has been practiced historically. However, in recent decades various factors, such as models of economic development and the paradigm of agrobusiness, gave way to a transformation of the structure of production in rural areas. Due this process, a lot of small family dairy farms were closed. The aim of this work is to analyze how the lifestyle of one of these milking families changed when they moved from a rural life to an urban life. The method used was the qualitative method of life histories.Mesa 27: Civilización y Barbarie. Mundo Rural: interculturalidad, familia y trabajoFacultad de Humanidades y Ciencias de la Educació

From country to town. Changes in rural families lifestyles

La localidad de San Jerónimo Norte se encuentra en el departamento Las Colonias, en la provincia de Santa Fe. En esta área se ha practicado históricamente la explotación tambera. Sin embargo en las últimas décadas diversos factores, como ser los modelos de desarrollo económico y el paradigma de los agronegocios, dieron cabida a una transformación de la estructura de la producción en las zonas rurales. A raíz de este proceso se cerraron una gran cantidad de pequeñas explotaciones tamberas de tipo familiar. El objetivo del trabajo es analizar el cambio en los estilos de vida de una de estas familias tamberas con el paso de la vida rural a la vida urbana. Se ha trabajado con el método cualitativo de las historias de vida.San Jerónimo Norte is located in Las Colonias department, in Santa Fe province. In this area, dairy industry exploitation has been practiced historically. However, in recent decades various factors, such as models of economic development and the paradigm of agrobusiness, gave way to a transformation of the structure of production in rural areas. Due this process, a lot of small family dairy farms were closed. The aim of this work is to analyze how the lifestyle of one of these milking families changed when they moved from a rural life to an urban life. The method used was the qualitative method of life histories.Mesa 27: Civilización y Barbarie. Mundo Rural: interculturalidad, familia y trabajoFacultad de Humanidades y Ciencias de la Educació