Relating geologic units and mobility system kinematics contributing to Curiosity wheel damage at Gale Crater, Mars

Curiosity landed on plains to the north of Mount Sharp in August 2012. By June 2016 the rover had traversed 12.9 km to the southwest, encountering extensive strata that were deposited in a fluvial-deltaic-lacustrine system. Initial drives across sharp sandstone outcrops initiated an unacceptably high rate of punctures and cracks in the thin aluminum wheel skin structures. Initial damage was found to be related to the drive control mode of the six wheel drive actuators and the kinematics of the rocker-bogie suspension. Wheels leading a suspension pivot were forced onto sharp, immobile surfaces by the other wheels as they maintained their commanded angular velocities. Wheel damage mechanisms such as geometry-induced stress concentration cracking and low-cycle fatigue were then exacerbated. A geomorphic map was generated to assist in planning traverses that would minimize further wheel damage. A steady increase in punctures and cracks between landing and June 2016 was due in part because of drives across the sharp sandstone outcrops that could not be avoided. Wheel lifetime estimates show that with careful path planning the wheels will be operational for an additional ten kilometers or more, allowing the rover to reach key strata exposed on the slopes of Mount Sharp

LEGITIMIDADE, DISCURSOS ORGANIZACIONAIS E RESPONSABILIDADE SOCIAL EMPRESARIAL

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 </style> <![endif]--> <p class="MsoBodyText"><span>Resumo</span></p> <p class="MsoBodyText"><span style="font-weight: normal;">O presente estudo foi conduzido com o objetivo de investigar, nos discursos organizacionais, vínculos capazes de evidenciar relações de poder entre as ações sociais desenvolvidas e implementadas por organizações privadas pela via da Responsabilidade Social Empresarial (RSE) e processos de atribuição de legitimidade ao papel social do empresário. A uma revisão bibliográfica focada na compreensão histórica do compromisso social do empresário e na correspondente construção discursiva da instância do poder para legitimação deste papel, segue-se uma aplicação de análise do discurso, por meio da qual se procurou indícios da reprodução desta forma peculiar de discurso organizacional em duas publicações de grande circulação, ao longo de mais de dois anos. Os 38 discursos construídos pelos porta-vozes de alguns dos maiores grupos empresariais brasileiros e por formadores de opinião no meio empresarial trazem fortes indicativos de que a construção discursiva da RSE vem se configurando como fundamental para este processo de legitimação.</span></p> <p class="MsoBodyText"><span style="font-weight: normal;"> </span></p> <p class="MsoBodyText"><span style="font-weight: normal;">Palavras-chave: Análise de Discurso, Discursos Organizacio