Browsing by Author "Molina, Francisco"

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    Figuring disasters, an experiment on thinking disruptions as methods
    (2019) Tironi, Manuel; Bacigalupe, Gonzalo; Knowles, Scott Gabriel; Dickinson, Simon; Gil, Magdalena; Kelly, Sarah; Ludwig, Jason; Moesch, Jarah; Molina, Francisco; Palma, Karla; Siddiqi, Ayesha; Waldmueller,Johannes
    In this report, we reflect on the 2-day thinkshop ‘Figuring disasters: methodological speculations in exorbitant worlds’ held in Valparaíso, Chile. The thinkshop aimed at discussing the possibility of inventing new genres for the figuration, representation and visualisation of distributed and processual geoclimatic disruptions. For this report, we assembled a choral essay in which each one of the participants selected one object of our visit to Messana—an informal settlement in the outskirts of Valparaíso that was severely damaged by the 2017 fires—and knit around, from and with it a reflection on the thinkshop and its questions. The report is thus fractionary. We do not look for wholes, perhaps as disasters themselves problematise linear narratives. We prefer to be attentive to what each one of us inherited from Messana and to stage that sensibility in a multiplicity, though adventures into what disasters as methods can and should be.
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    Interruptions: imagining an analytical otherwise for disaster studies in Latin America
    (Emerald Group Publishing Ltd, 2021) Tironi Rodo, Manuel Eugenio; Campos Knothe, Katherine Veronica; Acuña Bravo, Valentina Moraima; Isola Sanchez, Enzo Antonio; Bonelli, Cristobal; Gonzalez Galvez, Marcelo Ignacio; Kelly, Sarah; Juzam, Leila; Molina, Francisco; Pereira Covarrubias, Andres; Rivas, Ricardo; Undurraga Rodriguez, Beltran Felipe; Valdivieso, Sofia
    Purpose Based on the research, the authors identify how four key concepts in disaster studies-agency, local scale, memory and vulnerability-are interrupted, and how these interruptions offer new perspectives for doing disaster research from and for the South. Design/methodology/approach Meta-analysis of case studies and revision of past and current collaborations of authors with communities across Chile. Findings The findings suggest that agency, local scale, memory and vulnerability, as fundamental concepts for disaster risk reduction (DRR) theory and practice, need to allow for ambivalences, ironies, granularization and further materializations. The authors identify these characteristics as the conditions that emerge when doing disaster research from within the disaster itself, perhaps the critical condition of what is usually known as the South. Originality/value The authors contribute to a reflexive assessment of fundamental concepts for critical disaster studies. The authors offer research-based and empirically rich redefinitions of these concepts. The authors also offer a novel understanding of the political and epistemological conditions of the "South" as both a geography and a project.
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    Observations of Ablation Dynamics in Wire-Array Z-Pinch Experiments on the Llampüdkeñ Generator
    (2012) Veloso Espinosa, Felipe; Suzuki Vidal, Francisco Andres; Molina, Francisco; Mitchell, Ian H.; Chuaqui Kettlun, Hernán; Favre Dominguez, Mario Benjamin; Wyndham Hodder, Edmund Sydenham
    Wire-array Z-pinch experiments have been performed on the Llampüdkeñ generator (~470 kA in ~410 ns) [Chuaqui et al., Laser Part. Beams 15, 241 (1997)] using an overmassed load of aluminum wires. Time-resolved optical laser schlieren and extreme ultraviolet imaging were used in order to study the plasma ablation dynamics. The results show the formation and subsequent ablation of plasma from the wires, followed by the appearance of a precursor plasma column on the axis. According to these results and to the rocket model of wire ablation, an ablation velocity of (1.7-2.6) × 105 m/s is estimated, which is larger than those obtained in faster generators. Additionally, the main resemblances and differences with previous experiments are presented, allowing in this way to open the study of this configuration in smaller scale machines.
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    Refractive optical measurements on the Llampudken generator
    (AMER INST PHYSICS, 2006) Suzuki, Francisco; Veloso, Felipe; Molina, Francisco; Mitchell, Ian; Chuaqui, Hernan; Aliaga Rossel, Raul; Favre, Mario; Wyndham, Edmund; HerreraVelazquez, JJE
    Experiments with two different configurations of dense z-pinches have been carried out on the Llampudken generator with the objective of investigating the time evolution of the discharges. These configurations were studied with refractive optical measurements using the second harmonic of a Nd:YAG laser (10 ns FVVM lambda=532 run). The Llampudken generator delivered a pulse current of 450 kA with a 260 ns rise time. Refractive optical measurements with schlieren diagnostics were made using an optical system which provided two frames per discharge. The original beam was split into two separate beams with perpendicular polarizations using a polarizer beam splitter and an extra path length was introduced into one of the beams delaying it with respect to the other. The path through the discharge chamber was equal for both beams therefore providing identical views of the plasma at two different times. The images were recorded on 35mm cameras using suitably orientated polarizers to select the corresponding beam. As a complementary diagnostic technique, MCP cameras with exposure time of 2 ns were used to obtain VUV images of the loads. Preliminary results of these experiments will be presented and discussed.