Nous avons étudié le mélange de fluides visqueux dans des écoulements 2-D ouverts et fermés où des agitateurs créent de l'advection chaotique, i.e. des trajectoires lagrangiennes complexes. Notre étude, expérimentale, numérique et théorique, s'appuie sur deux types d'expériences de mélange chaotique, en domaine fermé et dans un canal ouvert. En système fermé, nous avons d'abord proposé une caractérisation topologique du mélange reposant sur l'enchevêtrement des trajectoires de points périodiques -- les "tiges fantômes". D'autre part, l'étude expérimentale du champ de concentration d'un colorant nous a permis de décrire le rôle des murs du domaine où se fait le mélange, pour les écoulements fermés comme ouverts. En fermé, la nature chaotique ou régulière des trajectoires initialisées près des bords détermine l'évolution du champ de concentration, même loin des bords. Nous avons ainsi observé une dynamique lente (algébrique) de l'homogénéisation quand la région chaotique s'étend jusqu'à des murs non-glissants. En ouvert, nous avons décrit l'évolution du champ de concentration dans, et en aval de la région de mélange, résultant de l'injection d'un blob de colorant. Nous avons décrit les éléments mal mélangés qui s'échappent aux temps courts, et l'apparition d'un motif permanent (auto-similaire) aux temps longs, déterminé par les orbites périodiques de la région de mélange. Des modifications de ce scénario apparaissent quand la région de mélange va jusqu'aux murs. Enfin, une modélisation à base de transformation du boulanger généralisée nous a permis de comprendre l'essentiel des mécanismes rencontrés.

In relativistischen Schwerionenkollisionen spielen seltsame Teilchen bei der Untersuchung heißer und dichter Materie eine wichtige Rolle. Dazu wird die Produktion von Hadronen mit Strangeness-Inhalt mit Hilfe eines Transportmodells vom Boltzmann-Ühling-Uhlenbeck (BUU)-Typ numerisch behandelt. Aktuelle Messungen der HADES-Kollaboration bezüglich K+- - und phi-Spektren bilden dabei den entsprechenden experimentellen Rahmen. Darüber hinaus wird das doppelt-seltsame Hyperon Xi- unterhalb der freien NN-Produktionsschwelle analysiert. Hadronische Multiplizitäten, Transversalimpuls- und Rapiditätsspektren werden mit neuen experimentellen Ergebnissen verglichen. Weiterhin werden Massenverschiebungen im Medium, die nukleare Zustandsgleichung sowie das mittlere Feld der Nukleonen berücksichtigt. Neben der Untersuchung von Kern-Kern-Stößen bietet sich in Proton-Kern-Kollisionen ein Vergleich mit jüngsten ANKE-Daten im Hinblick auf die phi-Ausbeute an. Mit Hilfe des BUU-Transportcodes wurden Tranzparenzverhältnisse ermittelt und die Absorption von phi-Mesonen untersucht. Dabei sind sekundäre phi-Produktionskanäle, Isospin-Asymmetrie und Detektorakzeptanzen von Bedeutung und werden systematisch für verschiedene Systemgrößen analysiert. Die impulsintegrierten Boltzmann-Gleichungen dienen im Rahmen einer kinetischen Nichtgleichgewichtsdynamik der Beschreibung hochkomprimierter nuklearer Materie auf hadronischem Niveau, wie sie sowohl beim Urknall als auch bei ultra-relativistischen Schwerionenkollisionen auftritt. Diese Theorie wird am Beispiel von Antiprotonen untersucht und unter Berücksichtigung verschiedener Expansionsmodelle numerisch ausgewertet. Dabei wird die Evolution der Proton- und Antiprotondichten bis zum Ausfrieren für SPS- und RHIC-Energien mittels eines hadro-chemischen Resonanzgasmodells als möglicher Lösungsansatz des "Antiproton-Puzzles" analysiert. Diskutiert wird darüber hinaus das Verhalten baryonischer Materie und Antimaterie im frühen Universum und der adiabatische Pfad kosmischer Materie im QCD-Phasendiagramm. / Strange particles play an important role as probes of relativistic heavy-ion collisions where hot and dense matter is studied. The focus of this thesis is on the production of strange particles within a transport model of Boltzmann-Ühling-Uhlenbeck (BUU) type. Current data of the HADES Collaboration concerning K+- and phi spectra provide the appropriate experimental framework. Moreover, the double-strange hyperon Xi- is analyzed below the free NN production threshold. Hadron multiplicities, transverse-momentum and rapidity spectra are compared with recent experimental data. Further important issues are in-medium mass shifts, the nuclear equation of state as well as the mean field of nucleons. Besides the study of AA collisions a comparison with recent ANKE data regarding the phi yield in pA collisions is done. Transparency ratios are determined and primarily investigated for absorption of phi mesons by means of the BUU transport code. Thereby, secondary phi production channels, isospin asymmetry and detector acceptance are important issues. A systematic analysis is presented for different system sizes. The momentum integrated Boltzmann equations describe dense nuclear matter on a hadronic level appearing in the Big Bang as well as in little bangs, in the context of kinetic off-equilibrium dynamics. This theory is applied to antiprotons and numerically calculated under consideration of various expansion models. Here, the evolution of proton- and antiproton densities till freeze-out is analyzed for ultra-relativistic heavy-ion collisions within a hadrochemic resonance gas model acting as a possible ansatz for solving the "antiproton puzzle". Furthermore, baryonic matter and antimatter is investigated in the early universe and the adiabatic path of cosmic matter is sketched in the QCD phase diagram.

Title: Study of strange particle production in jets with the ALICE experiment at the LHC Author: Vít Kučera Institute: Institute of Particle and Nuclear Physics Supervisors: RNDr. Jana Bielčíková, Ph.D., Nuclear Physics Institute of the CAS; Dr. Christian Kuhn, Institut Pluridisciplinaire Hubert CURIEN Abstract: Quark-gluon plasma is a state of matter existing under extreme energy densities and temperatures where quarks and gluons are deconfined. Complex phenomena occurring in the plasma emerge from the strong interaction of its constituents. This hot and dense strongly interacting matter can be created in ultra-relativistic heavy-ion collisions and its properties can be studied by measuring particles produced in the collisions. Partons produced in hard scatterings interact with the medium which modifies the production of particles in jets. Measurements of spectra of identified particles produced in jets represent an important tool for understanding the interplay of various hadronization mechanisms which contribute to the particle production in the medium created in heavy-ion collisions. In this thesis, we present the measurement of the pT spectra of Λ baryons and K0 S mesons produced in charged jets in central Pb-Pb collisions at the energy √ sNN = 2.76 TeV, measured in the ALICE experiment at the LHC. The...

Le plasma de quarks et de gluons est un état de matière obtenu lors de températures et de densités d’énergie extrêmes où les quarks et les gluons sont libres. Cette matière chaude et dense peut être créée dans les collisions d’ions lourds ultra-relativistes. Les mesures des spectres des particules identifiées produites dans des jets représentent un outil majeur permettant d'étudier les propriétés du plasma créé dans les collisions et d'ainsi comprendre les relations entre divers mécanismes contribuant à la production de particules dans ce milieu. Cette thèse présente une analyse des spectres en impulsion transverse des baryons Λ et mésons K0S produits dans des jets chargés lors de collisions Pb–Pb centrales à l'énergie sqrt(sNN) = 2.76 TeV mesurées avec ALICE au LHC. Les résultats sont utilisés pour discuter l'origine de l'augmentation du rapport entre baryons et mésons observée pour la production inclusive des particules dans les collisions d’ions lourds ultra-relativistes. / Quark–gluon plasma is a state of matter existing under extreme energy densities and temperatures where quarks and gluons are deconfined. This hot and dense strongly interacting matter can be created in ultra-relativistic heavy-ion collisions. Measurements of spectra of identified particles produced in jets represent a major tool for studying properties of the plasma created in the collisions and for understanding the interplay of various mechanisms which contribute to the particle production in this medium. In this thesis, we present the measurement of the transverse-momentum spectra of Λ baryons and K0S mesons produced in charged jets in central Pb–Pb collisions at the centre-of-mass energy sqrt(sNN) = 2.76 TeV, measured with ALICE at the LHC. The results of the analysis are used to discuss the origin of the enhancement of the baryon-to-meson ratio observed for the inclusive production of light-flavour particles in ultra-relativistic heavy-ion collisions.

In this essay a mediated video game reception of the game Life Is Strange is made, with the purpose of examining the players' meaning-making processes from a gender perspective. The materials of this essay consist of videos from six different YouTube channels where each player film themselves whilst playing through Life Is Strange as a way to review and share the gaming experience. The results show how the meaning-making processes are littered with gender discourses and affects. The affects offset discourses by amplification or by revealing discord between available cultural narratives and the simulated reality of the game. Even though the game highlights themes like female-centric relationships, suicide, euthanasia, lesbianism, socio-economic circumstances, social accountability and men's violence against women, it successfully delivers highly involving, enjoyable and appreciated gameplay experience. The game is shown to provide players with a platform around which they can connect and continue to discuss, raise awareness and produce knowledge around these important topics. The fan generated culture will in turn, reach a much larger audience than the game sales numbers reflect. / <p>Treated in seminar at Stockholm University</p>

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-01-28T13:34:12Z No. of bitstreams: 1 ericalucianadesouzasilva.pdf: 860450 bytes, checksum: 3df6011f98c4b7edab2923b46fb3e3a7 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-01-28T13:37:18Z (GMT) No. of bitstreams: 1 ericalucianadesouzasilva.pdf: 860450 bytes, checksum: 3df6011f98c4b7edab2923b46fb3e3a7 (MD5) / Made available in DSpace on 2016-01-28T13:37:18Z (GMT). No. of bitstreams: 1 ericalucianadesouzasilva.pdf: 860450 bytes, checksum: 3df6011f98c4b7edab2923b46fb3e3a7 (MD5) Previous issue date: 2014-09-09 / A pesquisa em questão pretende analisar os poemas de Oswaldo de Camargo contidos no livro O Estranho. Será verificado como o referido autor se insere no cenário da literatura afrodescendente brasileira, não apenas como um poeta que canta versos de protestos, mas um escritor que apresenta suas dores, frustrações, angústias e questionamentos. Sensações e sentimentos característicos não apenas da população afrodescendente, e sim do ser humano. Portanto, seus poemas serão lidos buscando a interação entre o universal, relativo às aflições do ser humano, com as questões sociais do engajamento. Acredita-se que esta comunhão de perspectivas distintas é que distingue o escritor Oswaldo de Camargo como um poeta que, antes de ser negro, preocupa-se em ser um bom escritor. / This research Project aims to analyze the poems of Oswaldo de Camargo in the book The Stranger. The way the author falls in the scenario of the Brazilian literature as an African descendente is to be verified, not only as a poet who sings verses protest, but also as a writer who presents his pains, frustrations, anxieties and questions. Therefore, his poems will be read seeking interaction between universal concerning afflictions of human beings, with social issues engagement. It is believed that afflictions of human beings, with social issues engagement. It is believed that this communion of different perspectives is what distinguishes the writer Oswaldo Camargo as a poet who, before being black, worries about being a good writer.

No description available.

In this thesis, depending on Benedict Anderson’s Studies of nationalism in his book The Imagined Communities, I will prove that in her historical fiction for children, Wondrous Journeys in Strange Lands, the Palestinian writer Sonia Nimr is reviving and reforming Arab national identity. Anderson identifies the nation as a group imagined by its members; the people who perceive and identify themselves as equal members in this group. For the people to imagine their nation, Anderson states three tools: the map as a representation of the geographical space, the census as a representation of population identity categories that live in a particular land, and the museum as the representation of historical and the legal continuity of certain ethnicities in a certain geographical space. The three tools are thoroughly abstracted and used in Nimr’s book as we follow the footsteps of Nimr’s heroine in her travels, we see her drawing Arab historical map, when Palestine was a canton in the great Arab State. The social fabric Nimr weaves by the characters in her book reflects the real and the reformed census of Arab ethnicities and their social classes with the highlighting of the essential role of Arabic women in society. The narrated society of Nimr’s work reforms nation’s census which accords with the extended pan Arab geography of Arab nation. The nation imagining requirements are completed by visiting the history and wandering in the historical Arabic cantons and cities which materialize Nimr’s trail to perpetuate those important places in her textual museum, which she builds in her addressed work to children to answer their question about who we are and how we are the most eligible ethnicities to live on this land. Nimr does not promote a certain political agenda nor casts a holy cover on the past; by contrast, she teaches Arab children past lessons to revive and reform their modern Arab national identity as a remedy for the catastrophic national present.

This qualitative study of a migrant self-organisation in Bologna, Italy analyses the power relations between immigrants and supporters within the field of voluntary work in the migration sector. Based on eight semi-structured interviews it explores the perception of power relations of the members of the intercultural association Spazio per tutti. The material was analysed with the help of thematic analysis and a postcolonial and intersectional perspective. In the first part of the discussion, it is demonstrated, along the theory of “strange encounters” of Sara Ahmed (2000), how dominant norms, such as the invisible norm of whiteness, are still present in the association and immigrants are confronted with the paradigm of integration. The second part of the analysis shows instead, with the help of Homi Bhabha’s theory of the third space (1994), how the association creates a space where fixed identities and roles can be challenged and negotiated. By taking the intersectional approach into account, it gets further clear that the internal power relations are more complex for being grasped along binary categories (e.g. immigrants and non-immigrants), as they for example do not reflect the special subject position of Black women. In a nutshell, the present case study demonstrates the need to draw the attention to the political dimension of social work with immigrants and to create more awareness for intersectional justice, also within organisations that already follow an empowerment approach.

In relativistischen Schwerionenkollisionen spielen seltsame Teilchen bei der Untersuchung heißer und dichter Materie eine wichtige Rolle. Dazu wird die Produktion von Hadronen mit Strangeness-Inhalt mit Hilfe eines Transportmodells vom Boltzmann-Ühling-Uhlenbeck (BUU)-Typ numerisch behandelt. Aktuelle Messungen der HADES-Kollaboration bezüglich K+- - und phi-Spektren bilden dabei den entsprechenden experimentellen Rahmen. Darüber hinaus wird das doppelt-seltsame Hyperon Xi- unterhalb der freien NN-Produktionsschwelle analysiert. Hadronische Multiplizitäten, Transversalimpuls- und Rapiditätsspektren werden mit neuen experimentellen Ergebnissen verglichen. Weiterhin werden Massenverschiebungen im Medium, die nukleare Zustandsgleichung sowie das mittlere Feld der Nukleonen berücksichtigt. Neben der Untersuchung von Kern-Kern-Stößen bietet sich in Proton-Kern-Kollisionen ein Vergleich mit jüngsten ANKE-Daten im Hinblick auf die phi-Ausbeute an. Mit Hilfe des BUU-Transportcodes wurden Tranzparenzverhältnisse ermittelt und die Absorption von phi-Mesonen untersucht. Dabei sind sekundäre phi-Produktionskanäle, Isospin-Asymmetrie und Detektorakzeptanzen von Bedeutung und werden systematisch für verschiedene Systemgrößen analysiert. Die impulsintegrierten Boltzmann-Gleichungen dienen im Rahmen einer kinetischen Nichtgleichgewichtsdynamik der Beschreibung hochkomprimierter nuklearer Materie auf hadronischem Niveau, wie sie sowohl beim Urknall als auch bei ultra-relativistischen Schwerionenkollisionen auftritt. Diese Theorie wird am Beispiel von Antiprotonen untersucht und unter Berücksichtigung verschiedener Expansionsmodelle numerisch ausgewertet. Dabei wird die Evolution der Proton- und Antiprotondichten bis zum Ausfrieren für SPS- und RHIC-Energien mittels eines hadro-chemischen Resonanzgasmodells als möglicher Lösungsansatz des "Antiproton-Puzzles" analysiert. Diskutiert wird darüber hinaus das Verhalten baryonischer Materie und Antimaterie im frühen Universum und der adiabatische Pfad kosmischer Materie im QCD-Phasendiagramm. / Strange particles play an important role as probes of relativistic heavy-ion collisions where hot and dense matter is studied. The focus of this thesis is on the production of strange particles within a transport model of Boltzmann-Ühling-Uhlenbeck (BUU) type. Current data of the HADES Collaboration concerning K+- and phi spectra provide the appropriate experimental framework. Moreover, the double-strange hyperon Xi- is analyzed below the free NN production threshold. Hadron multiplicities, transverse-momentum and rapidity spectra are compared with recent experimental data. Further important issues are in-medium mass shifts, the nuclear equation of state as well as the mean field of nucleons. Besides the study of AA collisions a comparison with recent ANKE data regarding the phi yield in pA collisions is done. Transparency ratios are determined and primarily investigated for absorption of phi mesons by means of the BUU transport code. Thereby, secondary phi production channels, isospin asymmetry and detector acceptance are important issues. A systematic analysis is presented for different system sizes. The momentum integrated Boltzmann equations describe dense nuclear matter on a hadronic level appearing in the Big Bang as well as in little bangs, in the context of kinetic off-equilibrium dynamics. This theory is applied to antiprotons and numerically calculated under consideration of various expansion models. Here, the evolution of proton- and antiproton densities till freeze-out is analyzed for ultra-relativistic heavy-ion collisions within a hadrochemic resonance gas model acting as a possible ansatz for solving the "antiproton puzzle". Furthermore, baryonic matter and antimatter is investigated in the early universe and the adiabatic path of cosmic matter is sketched in the QCD phase diagram.