The Origin, Early Evolution and Predictability of Solar Eruptions

Coronal mass ejections (CMEs) were discovered in the early 1970s when space-borne coronagraphs revealed that eruptions of plasma are ejected from the Sun. Today, it is known that the Sun produces eruptive flares, filament eruptions, coronal mass ejections and failed eruptions; all thought to be due to a release of energy stored in the coronal magnetic field during its drastic reconfiguration. This review discusses the observations and physical mechanisms behind this eruptive activity, with a view to making an assessment of the current capability of forecasting these events for space weather risk and impact mitigation. Whilst a wealth of observations exist, and detailed models have been developed, there still exists a need to draw these approaches together. In particular more realistic models are encouraged in order to asses the full range of complexity of the solar atmosphere and the criteria for which an eruption is formed. From the observational side, a more detailed understanding of the role of photospheric flows and reconnection is needed in order to identify the evolutionary path that ultimately means a magnetic structure will erupt

Escala de autoconceito no trabalho: construção e validação

Neste trabalho, a proposta é apresentar uma escala para a mensuração do autoconceito no trabalho, construída a partir da transposição do modelo de L'Écuyer (1978). Não há na literatura relatos sobre a existência de uma escala deste tipo, portanto, acentua-se aqui a importância em se fazer tal mensuração e, por conseguinte a construção e validação de uma escala deste tipo, já que a percepção do autoconceito é um fato que pode alterar o desempenho e até a satisfação dos indivíduos no trabalho. Os itens foram construídos e aplicados à uma amostra de 607 sujeitos (294 Mulheres e 305 Homens). Após a Análise Fatorial, o instrumento ficou composto por 43 itens, a serem respondidos numa escala tipo Likert de 5 pontos, (1-nunca; 3-às vezes; 5-sempre) e seis fatores que após a análise de confiabilidade apresentaram valores para o alpha de Cronbach acima de 0,70

Managing project success using project risk and green supply chain management

Purpose: The implementation of the risk management in the development of new car models can contribute to the improvement of the project management performance and project success. The purpose of this paper is to provide evidence about whether project risk management (PRM) and green supply chain management (GSCM) are positively related to project management performance and the project success. Design/methodology/approach: Data were collected from 145 project managers in the Malaysian automobile manufacturing industry and analyzed using structural equation modeling. Findings: The results found that PRM and the GSCM had a positive association with project management performance and the project success