Ética e imagem: um percurso

Eckert, Cornelia

doi:10.22456/1984-1191.9192

Cited by 3 publications

(4 citation statements)

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“…This is indicated by the solid circle in the inset of figure 1 which indicates the glass transition point as derived from the β-scaling law of MCT (see below). Further support for the correctness of our assignment of samples as glassy is the observation that all samples below the thus determined ϕ g show α-scaling, whereas those above violate it [40]. This is already visible in figure 1, where the thin lines show nearly identical line shapes at long times, whereas the first thick line obviously deviates.…”

Section: Light Scattering Experimentssupporting

confidence: 75%

“…That the binary mixture can indeed be mapped onto a one-component hard sphere system with an effective polydispersity of 12% was confirmed by analysis of the volume fraction dependence of the static structure factor [14]. Similarly the glass transition dynamics could be consistently interpreted within MCT in terms of an effective one-component system [40]. A first analysis within the β-scaling law (equation (2) below) provided an exponent parameter λ = 0.78, a nonergodicity parameter f c q max = 0.80 and a glass transition volume fraction ϕ g = 0.596 [14].…”

Section: System Characteristicsmentioning

confidence: 75%

“…τ −1/γ α ∝ |ϕ − ϕ g |. The two samples closest to the transition (as indicated by the nearest glassy sample) in a given region of the phase diagram, figure 3, were taken for extrapolation and the hard sphere value of γ = 2.55 was employed (a more detailed description of the procedure will be given elsewhere) [40]. As can be seen from figure 3, the extrapolation procedure is consistent with the light scattering data in the sense that all solid circles indicating glassy samples are situated outside the reentry region or on the transition line.…”

Section: Resultsmentioning

confidence: 99%

“…A first analysis within the β-scaling law (equation (2) below) provided an exponent parameter λ = 0.78, a nonergodicity parameter f c q max = 0.80 and a glass transition volume fraction ϕ g = 0.596 [14]. The slight deviations from the reported hard-sphere values (λ = 0.76, f c q max = 0.85, ϕ g = 0.58) [11, 41] can be explained by the broadening of the particle size distribution [40].…”

Section: System Characteristicsmentioning

confidence: 97%

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Glass transition dynamics of hard sphere like microgel colloids with short-ranged attractions

Eckert

Bartsch

2004

J. Phys.: Condens. Matter

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We have studied by dynamic light scattering the glass transition dynamics of a binary mixture of polystyrene microgel particles with a size ratio of R small /R large = 0.81 and a number ratio of N small /N large ≈ 2.7, where a short-ranged depletion attraction (δ ≈ 0.06) was induced by addition of linear polystyrene. This system shows a reentrant glass transition. We have determined the glass transition lines of this system in the experimental control parameter space given by the colloid volume fraction ϕ and the polymer concentration c p by employing the power law of mode coupling theory (MCT) for the α-relaxation times. We find a reentry region which is much larger than predicted by theory and reported for another colloidal system with depletion attractions. Analysing the fluid dynamics along the transition lines with the β-scaling law of MCT we extract the c p dependence of the exponent parameter λ and the non-ergodicity parameter f c q . The results are in qualitative agreement with the prediction of MCT for increasing attraction strength. The observed 'jump' of f c q is indicative of a change of the close by glass phase from a packingdriven to a bonding-driven glass. The increase of λ to 0.91 and its subsequent decrease may indicate the neighbourhood of an A 4 singularity.

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Section: Light Scattering Experimentssupporting

confidence: 75%

Section: System Characteristicsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: System Characteristicsmentioning

confidence: 97%

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Glass transition dynamics of hard sphere like microgel colloids with short-ranged attractions

Eckert

Bartsch

2004

J. Phys.: Condens. Matter

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“Por un lugar en la ciudad”. El uso de imágenes en un conflicto socioambiental

Girado

2013

Rev. Ilum.

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Desde la perspectiva de la Antropología Social y con base en un trabajo etnográfico desarrollado en la ciudad de Tandil (provincia de Buenos Aires, Argentina) en el que se abordó el conflicto socioambiental existente en torno al uso, gestión y ocupación del sistema serrano de Tandilia, el presente artículo busca reflejar las dificultades que se presentaron en el trabajo de campo respecto a la toma de fotografías durante la intensificación del conflicto socioambiental en Septiembre de 2011. En el marco del conflicto local, la fotografía se visualizó como una técnica complementaria de investigación, colaborando en la comprensión de las prácticas y discursos de los actores sociales. Empero, el uso de la dimensión visual en el trabajo etnográfico fue debatido por los protagonistas de la protesta, posibilitando reflexionar respecto a la demarcación entre lo público y lo privado en los contextos de registro, y poner en cuestión hasta donde vale el "consentimiento informado" cuando la investigación se realiza en espacios públicos. Palabras claves: Conflicto socioambiental. Minería. Espacio Público. Fotografía. "For a place in the city". The use of images in a socio-environmental conflict Abstract From a socio-anthropological perspective, and based in an ethnographic research in the city of Tandil (Buenos Aires, Argentina), in which the socio-environmental conflict related to the use, management and occupation of the mountain system of Tandilia was investigated, this article shows the difficulties that emerged in the process of taking photographs during the climax of the conflict, on September 2011. In this context, the photography was understood as a complementary technique of research, helping in the comprehension of the actors' practices and speeches. Nevertheless, the visual dimension was discussed by the protagonists of the protest, making possible the reflection about the distinction between the public and the private in the registration context, and the debate liked to the "informed consent" when the investigation is done in public spaces. Keyswords: Socio-environmental conflict. Mining. Public space. Photography.

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Um documentário revisitado: 555 Chocolatão

Neves

2013

Rev. Ilum.

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Em 2011, o desfecho de um longo processo de restituição de posse resultou na transferência da Vila Chocolatão, localidade de ocupação então situada em área nobre no Centro de Porto Alegre, para um residencial construído em um bairro periférico da cidade. Frente a esse momento de transição, foi elaborado um projeto de documentário etnográfico, cujo objetivo central residia não apenas na preservação de uma memória imagética dessa localidade, mas, sobretudo, em contrariar uma perspectiva homogeneizante sobre a população local. Sendo assim, o artigo tem por finalidade revisitar o processo de elaboração do documentário a partir de questionamentos que permearam sua realização. Palavras chave: Antropologia visual. Documentário etnográfico. Estética. Ética. Imagem. A Documentary Revisited: 555 Chocolatão Abstract In 2011, the outcome of a long going lawsuit resulted in the removal of Vila Chocolatão – an informal settlement then located in a prime area of downtown Porto Alegre – to a public housing project built in a suburb of the city. An ethnographic documentary was elaborated in order to follow the removal process. Its main objective was both to preserve an imagetic memory of the place, and, above all, to contradict a homogenizing perspective regarding the local population. Therefore, the article aims at revisiting the process of preparing the documentary based on the questions and concerns that guided its making. Keywords: Aesthetic. Ethics. Ethnographic documentary. Image. Visual Anthropology.

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Ética e imagem: um percurso

Cited by 3 publications

References 0 publications

Glass transition dynamics of hard sphere like microgel colloids with short-ranged attractions

Glass transition dynamics of hard sphere like microgel colloids with short-ranged attractions

“Por un lugar en la ciudad”. El uso de imágenes en un conflicto socioambiental

Um documentário revisitado: 555 Chocolatão

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