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As contribuições do movimento quilombola para a construção de uma proposta de educação específica
Os processos educativos e de formação político-identitários reproduzidos no interior de cada comunidade remanescente de quilombo, juntamente com as experiências advindas dos movimentos sociais quilombolas, são aspectos indispensáveis na discussão de implementação de uma modalidade escolar quilombola. Partindo de um estudo de caso, apresentaremos resultados das observações oriundas da comunidade quilombola de Carrapatos da Tabatinga e do movimento quilombola mineiro, bem como da pesquisa de dissertação de mestrado em Educação e da trajetória profissional na ONG Cedefes e na N’Golo. Para tanto, utilizamos por método a observação participantes, além de trechos de entrevistas centradas no problema, realizadas no campo de pesquisa. Dentre os resultados apresentados, buscaremos enfatizar as formas de se educar construídas nas trocas cotidianas e nas interações com as mobilizações políticas, sendo ambas importantes produtoras de pedagogias próprias, que se relacionam diretamente às reinvindicações e aos aspectos tradicionais presentes nas comunidades quilombolas, sendo parte de uma cosmovisão africana. Em constante diálogo, comunidades e movimento nos instigam a reconhecer formas alternativas de formação de sujeitos engajados, que se reconhecem enquanto quilombolas e que são responsáveis diretos pela preservação dos saberes-fazeres construídos nos espaços de suas respectivas comunidades.
Journal Article
Runaway and Hypervelocity Stars from Compact Object Encounters in Globular Clusters
The dense environments in the cores of globular clusters (GCs) facilitate many strong dynamical encounters among stellar objects. These encounters have been shown to be capable of ejecting stars from the host GC, whereupon they become runaway stars, or hypervelocity stars (HVSs) if unbound to the galactic potential. We study high-speed stellar ejecta originating from GCs by using Monte Carlo N-body models, in particular focusing on binary–single encounters involving compact objects. We pair our model-discriminated populations with observational catalogs of Milky Way GCs (MWGCs) to compose a present-day Galactic population of stellar ejecta. We find that these kinds of encounters can accelerate stars to velocities in excess of 2000 km s−1, to speeds beyond the previously predicted limits for ejecta from star-only encounters and in the same regime of Galactic center ejections. However, the same ejections can only account for 1.5%–20% of the total population of stellar runaways, and only 0.0001%–1% of HVS, with similar relative rates found for runaway white dwarfs. We also provide credible regions for ejecta from 149 MWGCs, which we hope will be useful as supplementary evidence when pairing runaway stars with origin GCs.
Journal Article
Margaret Hillert's The little runaway
\"Recounts the adventures of a runaway kitten\"--Provided by publisher.
Book
Magnetic energy conversion and runaway regeneration during fast deconfinement of vertically unstable disruption generated runaway beams
The fast deconfinement of a vertically unstable runaway beam is investigated using a 0-D model which includes self-consistently the vertical plasma motion and the generation of runaway electrons Kiramov and Breizman (2017 Physics of Plasmas 24 100702). It is found that due to the decay of the runaway current during deconfinement, the plasma is vertically accelerated, leading to a substantial enhancement of the electric field when it touches the wall, which can result in a large runaway avalanche, regeneration of the runaway current and noticeable energy deposition on the runaway beam. The dependence of the conversion of magnetic into runaway kinetic energy on the characteristic deconfinement time of the runaway electrons, the resistive time of the residual ohmic plasma during the disruption, and the initial current and position of the runaway beam is also investigated. Negligible conversion of magnetic into runaway kinetic energy and runaway regeneration are found for characteristic deconfinement times lower than 0.5 ms and low temperatures (a few eVs) of the residual ohmic plasma. Moreover, estimates of the power fluxes on the plasma facing components suggest that, unless the runaway current at deconfinement is small enough ( <1 MA), shorter deconfinement times would be required to increase the runaway wetted area to levels enough to avoid melting of the first wall materials (Be or W).
Journal Article
Trial by fire : a Raised by wolves novel
Bryn, the new alpha of her werewolf pack, must deal with an opposing pack led by her friend when a runaway begs her for help and protection from abuse.
BOOK
Advances in Early Warning of Thermal Runaway in Lithium‐Ion Battery Energy Storage Systems
Thermal runaway is a critical safety concern in lithium‐ion battery energy storage systems. This review comprehensively analyzes state‐of‐the‐art sensing technologies and strategies for early detection and warning of thermal runaway events. The primary inducing factors, evolution mechanism, and characteristic reactions at various stages are discussed. Detectable signals during thermal runaway, including temperature, gas emissions, pressure, strain, and acoustic signals, are examined, along with advancements in corresponding sensing technologies. The importance of sensor implantation, collaboration, and communication within battery cells is highlighted, as well as the development of intelligent algorithms and early warning models. Miniaturized, integrated, and arrayed sensors within battery cells are identified as an inevitable trend in advancing safety monitoring systems. Intrinsically safe design of future battery systems, considering distinct thermal runaway characteristics of emerging technologies, is crucial for enhancing safety and reliability. Future research shall focus on developing advanced sensing technologies for real‐time, in situ monitoring, establishing a new paradigm for thermal runaway diagnosis using intelligent algorithms, and integrating battery models with these algorithms for accurate state estimation and early warnings. This review provides insights to guide the development of advanced sensing and early warning strategies, facilitating the widespread adoption of renewable energy storage technologies. This review presents a comprehensive analysis of cutting‐edge sensing technologies and strategies for early detection and warning of thermal runaway in lithium‐ion battery energy storage systems. It discusses the factors inducing thermal runaway, the evolution mechanism, and the detectable characteristic signals, along with advancements in corresponding sensing technologies.
Journal Article
The bridge home
Four determined homeless children make a life for themselves in Chennai, India.
Book
Review on Thermal Runaway of Lithium-Ion Batteries for Electric Vehicles
Lithium-ion batteries are favored by the electric vehicle (EV) industry due to their high energy density, good cycling performance and no memory. However, with the wide application of EVs, frequent thermal runaway events have become a problem that cannot be ignored. The following is a comprehensive review of the research work on thermal runaway of lithium-ion batteries. Firstly, the functions of each part of the battery and the related flame-retardant modification are summarized. The thermal properties of the battery are improved by means of coating of cathode materials and adding anion receptors. Secondly, the thermal runaway behavior and its triggering mechanism are introduced, and the decomposition reactions of common cathode materials are analyzed. Finally, the methods of thermal runaway monitoring and thermal management are summarized to provide the reference for the safety of lithium-ion batteries.
Journal Article