Particle dispersion in synthetic turbulent flows

We study particle dispersion advected by a synthetic turbulent flow from a Lagrangian perspective and focus on the two-particle and cluster dispersion by the flow. It has been recently reported that Richardson¿s law for the two-particle dispersion can stem from different dispersion mechanisms, and can be dominated by either diffusive or ballistic events. The nature of the Richardson dispersion depends on the parameters of our flow and is discussed in terms of the values of a persistence parameter expressing the relative importance of the two above-mentioned mechanisms. We support this analysis by studying the distribution of interparticle distances, the relative velocity correlation functions, as well as the relative trajectories.

Langevin approach to generate synthetic turbulent flows

We present an analytical scheme, easily implemented numerically, to generate synthetic Gaussian turbulent flows by using a linear Langevin equation, where the noise term acts as a stochastic stirring force. The characteristic parameters of the velocity field are well introduced, in particular the kinematic viscosity and the spectrum of energy. As an application, the diffusion of a passive scalar is studied for two different energy spectra. Numerical results are compared favorably with analytical calculations.

Diffusive transport in spatially periodic hydrodynamic flows

We calculate the effective diffusion coefficient in convective flows which are well described by one spatial mode. We use an expansion in the distance from onset and homogenization methods to obtain an explicit expression for the transport coefficient. We find that spatially periodic fluid flow enhances the molecular diffusion D by a term proportional to D-1. This enhancement should be easy to observe in experiments, since D is a small number.

La història cultural i l'intel·lectual professional. Una visió personal

The author exposes the main research lines in the history of local culture. He briefly considers the main lines in cultural contemporary history investigation. The author studies the introduction and development of cultural history based on the concept of intellectual professional in Catalan historiography at a moment when economical and social research were preferred by a large part of local historians.

La història cultural i l'intel·lectual professional. Una visió personal

The author exposes the main research lines in the history of local culture. He briefly considers the main lines in cultural contemporary history investigation. The author studies the introduction and development of cultural history based on the concept of intellectual professional in Catalan historiography at a moment when economical and social research were preferred by a large part of local historians.

Identitat cultural de gènere, discurs de la domesticitat i definició del treball de les dones a l'Espanya del segle XIX

Aquest article argumenta que la construcció histbrica de la feminitat va ser crucial en la conceptualització i definició del treball remunerat de les dones. En el context de la Catalunya de finals del segle dinou i comentaments del vint, examina la construcció sociocultural de gtnere i se centra en el discurs de la conceptualització del treball femení al mateix temps que 6s examinat des de la perspectiva de la diversitat de classe. A més, I'estudi analitza el desenvolupament d'una cultura del treball en el context del moviment de la classe treballadora i planteja el problema del context de la classe treballadora per generar una visió alternativa del treball remunerat de les dones que reconegui el paper de les treballadores. Demostra que, malgrat la visió radical i10 revolucionAria de la societat, les relacions de gknere en gran mesura no han estat qüestionades en els circuits de la classe treballadora. Aquest article considera el discurs de la domesticitat com a crucial en el desenvolupament de I'actitud de la classe treballadora catalana cap al treball assalariat femení i examina les implicacions que aixb va tenir en la continua discriminació i en la manca del reconeixement social del treball assalariat de les dones.

Ressenya de PEYTAVÍ DEIXONA, Joan, 'Catalans i occcitans a la Catalunya moderna (Comtats del Rosselló i Cerdanya s. XVI-XVII). Barcelona, Omnium Cultural, 2005

Amb aquests dos gruixuts volums Joan Peytaví fa un regal inestimable als filòlegs, particularment als estudiosos de l"onomàstica i la llengua catalanes, als historiadors i estudiosos de la història de la població i, en general, a la cultura catalana i, especialment, a la de la Catalunya del Nord.

Migration Flows and Quality of Life in a Metropolitan Area: the Case of Barcelona-Spain

The phenomenon of human migration is certainly not new and it has been studied from a variety of perspectives. Yet, the attention on human migration and its determinant has not been fading over time as confirmed by recent contributions (see for instance Cushing and Poot 2004 and Rebhun and Raveh 2006). In this paper we combine the recent theoretical contributions by Douglas (1997) and Wall (2001) with the methodological advancements of Guimarães et al. (2000, 2003) to model inter-municipal migration flows in the Barcelona area. In order to do that, we employ two different types of count models, i.e. the Poisson and negative binomial and compare the estimations obtained. Our results show that, even after controlling for the traditional migration factors, QoL (measured with a Composite Index which includes numerous aspects and also using a list of individual variables) is an important determinant of short distance migration movements in the Barcelona area.

Workers' perception of workplace bullying: a cross-cultural study

This study is one of the first studies to approach workplace bullying cross-culturally. It sought to compare employees' understanding of workplace bullying in two different world regions: Central America and Southern Europe, regarding three aspects of workplace bullying: psychological vs. physical harassment, hierarchical vs. horizontal bullying, and direct vs. indirect aggression. A convenience sample of 246 workers provided their own definition of workplace bullying through a single, open-ended question. The results showed that employees from Central America emphasized the physical component of workplace bullying more than the Southern European employees. However, similarities in the conceptualization of workplace bullying across both cultures were found as well. Both Southern European and Central American employees defined workplace bullying mainly as a hierarchical phenomenon, where the aggression took the form of direct strategies. Such differences and similarities bring to the field some positive inputs for the development and implementation of different strategies for dealing effectively with this phenomenon.

Workers' perception of workplace bullying: a cross-cultural study

This study is one of the first studies to approach workplace bullying cross-culturally. It sought to compare employees' understanding of workplace bullying in two different world regions: Central America and Southern Europe, regarding three aspects of workplace bullying: psychological vs. physical harassment, hierarchical vs. horizontal bullying, and direct vs. indirect aggression. A convenience sample of 246 workers provided their own definition of workplace bullying through a single, open-ended question. The results showed that employees from Central America emphasized the physical component of workplace bullying more than the Southern European employees. However, similarities in the conceptualization of workplace bullying across both cultures were found as well. Both Southern European and Central American employees defined workplace bullying mainly as a hierarchical phenomenon, where the aggression took the form of direct strategies. Such differences and similarities bring to the field some positive inputs for the development and implementation of different strategies for dealing effectively with this phenomenon.

Cos, identitat i diversitat cultural. Presentació

Cos, identitat i immigració constitueixen tres realitats que quan convergeixen generen un nou punt de mira del fet migratori a la societat actual. La vivència de la pròpia corporalitat i els matisos que adquireix aquest procés en la població immigrada permeten entreteixir un discurs que mostra una nova dimensió de la construcció de la pròpia identitat en les societats multiculturals. La principal intenció del present monogràfic és, doncs, obrir una nova via de reflexió sobre el fet migratori i alhora fer visible la implicació de la cultura corporal en les transformacions socials.

¿Cómo podemos entender la inteligencia en el siglo XXI?: una visión psico-socio-cultural.

Indudablemente, no podemos desligar el tema del alumnado con altas capacidades intelectuales del constructo “inteligencia”, ya que en el fondo las sucesivas definiciones de inteligencia o de conducta inteligente marcan qué vamos a evaluar como “capacidad intelectual superior”.El siglo XX, ha sido rico en definiciones e instrumentos de medida, especialmente desde el ámbito de la Psicología, aunque no debemos dejar de lado los aportes de otras ciencias como la biología, la cibernética, la antropología o la neurología por citar algunas. Muchos autores han intentado rastrear el concepto de inteligencia y su evolución en estos últimos 100 años...