Collision probabilities in the rarefaction fan of asymmetric exclusion processes

We consider the one-dimensional asymmetric simple exclusion process (ASEP) in which particles jump to the right at rate p is an element of (1/2, 1.] and to the left at rate 1 - p, interacting by exclusion. In the initial state there is a finite region such that to the left of this region all sites are occupied and to the right of it all sites are empty. Under this initial state, the hydrodynamical limit of the process converges to the rarefaction fan of the associated Burgers equation. In particular suppose that the initial state has first-class particles to the left of the origin, second-class particles at sites 0 and I, and holes to the right of site I. We show that the probability that the two second-class particles eventually collide is (1 + p)/(3p), where a collision occurs when one of the particles attempts to jump over the other. This also corresponds to the probability that two ASEP processes. started from appropriate initial states and coupled using the so-called ""basic coupling,"" eventually reach the same state. We give various other results about the behaviour of second-class particles in the ASEP. In the totally asymmetric case (p = 1) we explain a further representation in terms of a multi-type particle system, and also use the collision result to derive the probability of coexistence of both clusters in a two-type version of the corner growth model.

The dynamics of cargo driven by molecular motors in the context of asymmetric simple exclusion processes

We consider the dynamics of cargo driven by a collection of interacting molecular motors in the context of ail asymmetric simple exclusion process (ASEP). The model is formulated to account for (i) excluded-volume interactions, (ii) the observed asymmetry of the stochastic movement of individual motors and (iii) interactions between motors and cargo. Items (i) and (ii) form the basis of ASEP models and have already been considered to study the behavior of motor density profile [A. Parmeggiani. T. Franosch, E. Frey, Phase Coexistence in driven one-dimensional transport, Phys. Rev. Lett. 90 (2003) 086601-1-086601-4]. Item (iii) is new. It is introduced here as an attempt to describe explicitly the dependence of cargo movement on the dynamics of motors in this context. The steady-state Solutions Of the model indicate that the system undergoes a phase transition of condensation type as the motor density varies. We study the consequences of this transition to the behavior of the average cargo velocity. (C) 2009 Elsevier B.V. All rights reserved.

The sociological perspective on the knowledge-based society: assumptions, facts and visions

The paper will present the central discourse of the knowledge-based society. Already in the 1960s the debate of the industrial society already raised the question whether there can be considered a paradigm shift towards a knowledge-based society. Some prominent authors already foreseen ‘knowledge’ as the main indicator in order to displace ‘labour’ and ‘capital’ as the main driving forces of the capitalistic development. Today on the political level and also in many scientific disciplines the assumption that we are already living in a knowledge-based society seems obvious. Although we still do not have a theory of the knowledge-based society and there still exist a methodological gap about the empirical indicators, the vision of a knowledge-based society determines at least the perception of the Western societies. In a first step the author will pinpoint the assumptions about the knowledge-based society on three levels: on the societal, on the organisational and on the individual level. These assumptions are relied on the following topics: a) The role of the information and communication technologies; b) The dynamic development of globalisation as an ‘evolutionary’ process; c) The increasing importance of knowledge management within organisations; d) The changing role of the state within the economic processes. Not only the differentiation between the levels but also the revision of the assumptions of a knowledge-based society will show that the ‘topics raised in the debates’ cannot be considered as the results of a profound societal paradigm shift. However what seems very impressive is the normative and virtual shift towards a concept of modernity, which strongly focuses on the role of technology as a driving force as well as on the global economic markets, which has to be accepted. Therefore – according to the official debate - the successful adaptation of these processes seems the only way to meet the knowledge-based society. Analysing the societal changes on the three levels, the label ‘knowledge-based society’ can be seen critically. Therefore the main question of Theodor W. Adorno during the 16th Congress of Sociology in 1968 did not loose its actuality. Facing the societal changes he asked whether we are still living in the industrial society or already in a post-industrial state. Thinking about the knowledge-based society according to these two options, this exercise would enrich the whole debate in terms of social inequality, political, economic exclusion processes and at least the power relationship between social groups.

Produção do espaço urbano e exclusão social em Marília-SP

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Exclusão social, políticas públicas e representações sociais na cidade de Londrina - PR: um olhar sobre o assentamento urbano Jardim Maracanã

Pós-graduação em Geografia - FCT

Análise da Casa do Caminho

Pós-graduação em Psicologia - FCLAS

Mapeamento da exclusão social em cidades médias: interfaces da geografia econômica com a geografia política

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Perspectives on the use of lakes and ponds as model systems for macroecological research

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Laços de família e segredos (sexuais) compartilhados: narrativa de história de vida de uma jovem dissidente em uma família homofóbica

This paper presents a non-heterosexual young lady s Narrative Life History. By presenting it, we aim to understanding how desire, (in)visibility and the processes of exclusion are articulated in relation to the experience of homoeroticism, especially within the family. By this, we are able to point out some homophobic aspects, modes of how the device of closet operates and how some expectations and demands exert pressures over a non-heterosexual member in the family. In this case study, the way her family lived her sexuality depended on a strong family ties, such as: the secret about sexuality. Such secret, according to our hypothesis, was produced and preserved by homophobia which served as the major aspect on the construction of gender and (dis)unity of the family. This work is part of a in progress doctoral thesis, sponsored by FAPESP Fundação para o Amparo à Pesquisa no Estado de São Paulo.

Hybrid bodies in cyborg sports? The case of Oscar Pistorius

The capabilities of postmodern biotechnology inevitably lead to questioning if it is morally acceptable to use all possibilities offered by technology. In sport, this very complex issue is dealt with by drawing clear boundaries between naturalness and artificiality. Currently, new biotechnology is constantly being produced and with this, boundaries between naturalness and artificiality, between normal and abnormal, human and hybrid are constantly shifting . “Human enhancement” is a fascinating prism that reflects contemporary questions of participation, justice, equality and the autonomy of the subject in all social fields. The area of elite sports is particularly affected by “human enhancement”, according to the principle of exceeding what has come before, of aiming higher, faster and further. This paper analyses the postulated “naturalness” in the regulative and normalising function in the area of elite sports, in connection with Foucault’s theory of governmentality. The example of the South African sprinter Oscar Pistorius appears to be particularly suited to illustrate current definition difficulties in the area of disabled and non-disabled people in differentiated competitive sports. His is a vivid example of a multifaceted body-sociological analysis of current sport culture and the construction of reality or naturalness in the framework of the discourse of drafting and negotiating the accreditation for sprint competitions of non-disabled athletes, most recently in the London Olympics 2012. Using the case study of Oscar Pistorius, the negotiating processes in relation to the argumentation logic, dynamics and resistance in shifting distinctions are presented in detail using the fundamental documents of the IOC, IPC, CAS and IAAF. Represented through the inclusion and exclusion processes are hierarchies of the body that are (re)consolidated and transformed. The central question emerges as to how the worth of equal opportunity and fairness in regard to “naturalness” can be reconsolidated or transformed.

Acerca de algunas cuestiones invisibilizadas detrás de las Escuelas Inclusivas : de la declaración de los derechos de los niños a la deconstrucción de sus derechos

Este trabajo tiene como propósito problematizar experiencias derivadas de la intención de hacer de las organizaciones escolares -tal como funcionan en la actualidad, “escuelas inclusivas"- de modo de evitar que por esta vía y sin demasiada conciencia al respecto, se continúe avanzando en la profundización de un modelo que –por falta de revisión- corre el riesgo de terminar legitimando prácticas que, en ocasiones, hasta puedan estar contribuyendo a desvirtuar de manera significativa las intenciones y los principios mismos a partir de los cuales se sostienen. Para esto se aportan algunos elementos que contribuyen a visibilizar algunas cuestiones que –a partir de la riqueza que brinda una lectura de carácter interdisciplinaria de las mismas- se observa que se han ido naturalizando, a través de diversas prácticas pedagógicas orientadas a la “inclusión escolar" de niños con necesidades educativas especiales, algunos de cuyos “efectos" parecen –paradójicamente- estar promoviendo, incluso, hasta lo opuesto, es decir, procesos de “exclusión" encubiertos. Entre ellos, se hace referencia al de la “patologización y medicalización de las infancias y adolescencias actuales", a partir del cual se produce una suerte de “inversión" de los procesos de la pretendida “escuela inclusiva".

Juventud, delito y trabajo en San Salvador de Jujuy (Argentina)

El delito juvenil y la inseguridad pública de la Argentina reciente son temas que se han instalado en la agenda tanto política como científica. Algunos autores proponen comprender a estos fenómenos como producto de los procesos de declive institucional que atraviesa actualmente el país, declive que se caracteriza por una serie de transformaciones de las estructuras institucionales de tradición social salarial que afectaron no solo a las economías domésticas sino a un estilo de vida organizado en torno al trabajo, la familia y la educación. En San Salvador de Jujuy, los jóvenes infractores de la ley penal tienen familias cuyas condiciones sociales aparentan derivarse de estos procesos: existencias cercanas a -inmersas en- la pobreza; en algunos casos, necesidades básicas insatisfechas; pertenencia a una escenografía urbana periférica y marginal. Además, estos jóvenes son percibidos y representados mediáticamente con sentidos valorativos cargados de prejuicios y posturas que esencializan el delito, invisibilizando el carácter social y cultural de la problemática. Precisamente, la propuesta de este trabajo radica en analizar y discutir las condiciones de vida de este segmento poblacional, junto con los procesos de exclusión social por los cuales transita de manera fluctuante, con el objetivo de contribuir, a través de un estudio situado, a la comprensión de una problemática cada vez más relevante

Juventud, delito y trabajo en San Salvador de Jujuy (Argentina)

El delito juvenil y la inseguridad pública de la Argentina reciente son temas que se han instalado en la agenda tanto política como científica. Algunos autores proponen comprender a estos fenómenos como producto de los procesos de declive institucional que atraviesa actualmente el país, declive que se caracteriza por una serie de transformaciones de las estructuras institucionales de tradición social salarial que afectaron no solo a las economías domésticas sino a un estilo de vida organizado en torno al trabajo, la familia y la educación. En San Salvador de Jujuy, los jóvenes infractores de la ley penal tienen familias cuyas condiciones sociales aparentan derivarse de estos procesos: existencias cercanas a -inmersas en- la pobreza; en algunos casos, necesidades básicas insatisfechas; pertenencia a una escenografía urbana periférica y marginal. Además, estos jóvenes son percibidos y representados mediáticamente con sentidos valorativos cargados de prejuicios y posturas que esencializan el delito, invisibilizando el carácter social y cultural de la problemática. Precisamente, la propuesta de este trabajo radica en analizar y discutir las condiciones de vida de este segmento poblacional, junto con los procesos de exclusión social por los cuales transita de manera fluctuante, con el objetivo de contribuir, a través de un estudio situado, a la comprensión de una problemática cada vez más relevante

Juventud, delito y trabajo en San Salvador de Jujuy (Argentina)

El delito juvenil y la inseguridad pública de la Argentina reciente son temas que se han instalado en la agenda tanto política como científica. Algunos autores proponen comprender a estos fenómenos como producto de los procesos de declive institucional que atraviesa actualmente el país, declive que se caracteriza por una serie de transformaciones de las estructuras institucionales de tradición social salarial que afectaron no solo a las economías domésticas sino a un estilo de vida organizado en torno al trabajo, la familia y la educación. En San Salvador de Jujuy, los jóvenes infractores de la ley penal tienen familias cuyas condiciones sociales aparentan derivarse de estos procesos: existencias cercanas a -inmersas en- la pobreza; en algunos casos, necesidades básicas insatisfechas; pertenencia a una escenografía urbana periférica y marginal. Además, estos jóvenes son percibidos y representados mediáticamente con sentidos valorativos cargados de prejuicios y posturas que esencializan el delito, invisibilizando el carácter social y cultural de la problemática. Precisamente, la propuesta de este trabajo radica en analizar y discutir las condiciones de vida de este segmento poblacional, junto con los procesos de exclusión social por los cuales transita de manera fluctuante, con el objetivo de contribuir, a través de un estudio situado, a la comprensión de una problemática cada vez más relevante