Slow passage through thresholds in quantum dot lasers

A turn on of a quantum dot (QD) semiconductor laser simultaneously operating at the ground state (GS) and excited state (ES) is investigated both experimentally and theoretically. We find experimentally that the slow passage through the two successive laser thresholds may lead to significant delays in the GS and ES turn ons. The difference between the turn-on times is measured as a function of the pump rate of change and reveals no clear power law. This has motivated a detailed analysis of rate equations appropriate for two-state lasing QD lasers. We find that the effective time of the GS turn on follows an -1/2 power law provided that the rate of change is not too small. The effective time of the ES transition follows an -1 power law, but its first order correction in ln is numerically significant. The two turn ons result from different physical mechanisms. The delay of the GS transition strongly depends on the slow growth of the dot population, whereas the ES transition only depends on the time needed to leave a repellent steady state.

Production et articulation des appartenances au mouvement Slow Fashion sur Twitter

Ce mémoire explore les productions et les articulations des appartenances au mouvement Slow Fashion sur Twitter. En réaction au modèle actuel prédominant du Fast Fashion, basé sur une surproduction et une surconsommation des vêtements, le Slow Fashion sensibilise les différents acteurs du secteur de la mode à avoir une vision plus consciente des impacts de leurs pratiques sur les travailleurs, les communautés et les écosystèmes (Fletcher, 2007) et propose une décélération des cycles de production et de consommation des vêtements. L’enjeu de cette recherche est de montrer que le Slow Fashion se dessine notamment à travers les relations entres les différents acteurs sur Twitter et que l'ensemble de ces interactions prend la forme d'un rhizome, c’est-à-dire d’un système dans lequel les éléments qui le composent ne suivent aucune arborescence, aucune hiérarchie et n’émanent pas d’un seul point d’origine. (Deleuze & Guattari, 1976) Sur Twitter, les appartenances au Slow Fashion font surface, se connectent les unes aux autres par des liens de nature différente. Consommateurs, designers, entreprises, journalistes, etc., ces parties prenantes construisent collectivement le Slow Fashion comme mouvement alternatif à la mode mainstream actuelle. Mon cadre théorique s’est construit grâce à une analyse de la littérature des concepts de mode, d’identité et d’appartenance afin de mieux appréhender le contexte dans lequel le mouvement a émergé. Puis, j’ai également réalisé une étude exploratoire netnographique sur Twitter au cours de laquelle j’ai observé, tout en y participant, les interactions sur la plateforme abordant le Slow Fashion et/ou la mode éthique. Publiée sur ce blogue (http://belongingtoslowfashion.blogspot.ca), cette « creative presentation of research » (Chapman & Sawchuk, 2012) ne constitue pas une histoire présentant les prétendues origines de ce mouvement mais plutôt une photographie partielle à un certain moment du Slow Fashion. Construite tel un rhizome, elle n’a ni début, ni fin, ni hiérarchie. J’invite alors les lectrices/lecteurs à choisir n’importe quelle entrée et à délaisser toute logique linéaire et déductive. Cette exploration sera guidée par des liens hypertextes ou des annotations qui tisseront des connexions avec d’autres parties ou feront émerger d’autres questionnements. Il s’agit d’offrir une introduction aux enjeux que pose le Slow Fashion, d’ouvrir la voie à d’autres recherches et d’autres réflexions, ou encore de sensibiliser sur ce sujet.

Meios de divulgação promocionais de cinema: estudo sobre o impacto nos consumidores

This article presents part of the results obtained under a project that sought out to know and understand the determining factors in the ways of attendance at movie theaters, with the main goal to analyze each of the cinematic means of disclosure and their respective communicative role. The study was carried out through a theoretical and conceptual analysis using a quantitative approach. The main tool for data collection was a questionnaire that included the participation of 380 subjects. The findings show that the main determinant means of disclosure in choosing films as key influencers of visits to Portuguese cinemas were the Internet and the word-of-mouth phenomenon.

A literatura no cinema Oliveiriano

São nítidas na cinematografia do emblemático realizador português Manoel de Oliveira as influências de outras artes, nomeadamente da literatura. Com efeito, a adaptação literária é objeto de interesse do cineasta em diversas produções fílmicas dando origem a obras centradas sobre variadas temáticas, onde sobressai a figura feminina e os textos de Agustina Bessa-Luís. O envolvimento do realizador neste contexto de diálogo intertextual remonta às suas primeiras produções ficcionais (Aniki-Bobó, 1942) e permanece ao longo da sua vasta carreira cinematográfica. Estudar o registo filmográfico ficcional Oliveiriano é repensar questões relativas à adaptação literária e às suas particularidades. É, similarmente, refletir sobre o lugar da adaptação no cinema português e, ao mesmo tempo, equiparar o cineasta luso à constelação de realizadores paradigmáticos da história do cinema mundial que estabeleceram uma relação dialógica com fontes escritas. Com o propósito de sustentar a argumentação, a reflexão encontra-se ancorada em estudos de literatura e cinema e na teoria da adaptação. Partindo do vínculo dialogal entre literatura e cinema na obra de Manoel de Oliveira, o presente texto procura estabelecer uma reflexão acerca da adaptação literária e paralelamente relembrar as singularidades da transmutação fílmica dando destaque às diversas adaptações literárias de índole Oliveiriana que o cinema português tem testemunhado. A literatura no cinema de Oliveira contribui para testemunhar o elo positivo que historicamente tem ligado estas duas formas de expressão e oferece um exercício de releitura original destacando liberdade criativa e a independência que caracterizam Manoel de Oliveira.

Interpreting independence in Latin American cinema today: the digital option

Globalisation has transformed “independence” into, at best, “inter-dependence”. In Latin American film, this process has been experienced as a decline in the national productions, now usually co-productions, and a tendency towards the self-exoticising as films cater for a festival-circuit global audience; similarly, theatrical exhibition takes place in one of a handful of the global multiplex complexes. Moreover, narrative film itself has long been regarded as inherently “dependent”, on the conservative sectors that have provided its finance, with the word “independent” referring to authorial features only. However, the very same processes that have allowed for such an unprecedented corporate control of these film industries have also spawned a parallel network of local, regional and national filmmaking, distribution and exhibition through digital media. From the “Mi Cine” project in Mexico to the “Cine Piquetero” in Argentina, digital filmmaking is empowering viewers and restoring agency to local filmmakers. In this paper I argue for this understanding of “independence” in the contemporary cinematic spheres of Latin America: the re-appropriation, amidst the transnationalism of the day, of the democratising potential of cinema that Walter Benjamin once thought was inherent to the medium.

Chicano identity and discourses of supplementarity on Mexican cinema: from ‘The Man Without a Fatherland’ (Contreras Torres: 1922) to ‘Under the Same Moon’ (Riggen: 2008)

A radical change took place in Mexican narratives of belonging during the 1990s, when NAFTA was first negotiated. Narratives of migration drastically changed the status of Mexican migrants to the US, formerly derided as ‘pochos’, presenting them as model citizens instead. Following Derrida, I argue the role of the migrant became that of a supplement, which is, discursively, at the same time external to and part of a given unit, standing for and allowing deeper transformations to take place in the whole discourse of bilateral relations and national identity more generally. I use Derrida’s concept of the supplement to discuss changing representations of Chicanos in Mexican cinema, and to assess the extent that they have succeeded in reframing the discourse on national identity, with a focus on gender.

I3MEDIA, e-journal of cinema, television and media studies. Especial Sport&Media

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