Iso-viscosity curves for secondary steelmaking slags in the CaO-SiO2-Al2O3-MgO system at temperatures 1500,1600 and 1700°C

Uma pequena alteração na composição química e na temperatura afeta a viscosidade da escória, a qual possui uma grande parte das propriedades físicas relativas às escórias de refinação. A optimização desses parâmetros pode afetar a limpeza do aço. O processo de medição da viscosidade é considerado custoso, portanto a relação custo-benefício não favorece as medidas a altas temperaturas. Como alternativa, é possível aplicar modelos matemáticos ou software termodinâmico para obter viscosidades para uma determinada gama de composição química e temperatura das escórias. O presente trabalho contempla uma validação dos dados experimentais, recolhidos na literatura, com dados calculados. E também propõe também uma representação precisa das curvas de iso-viscosidade aplicadas às escórias secundárias da siderurgia, cobrindo as gamas de composição: 0-100 massa.% CaO, 0-100 massa.% SiO2, 0-100 massa.% Al2O3 e 0-15 massa.% MgO (CSAM) sistema a 1500ºC a 1700ºC. Os campos de representação de viscosidade incluem escória totalmente líquida e parcialmente líquida no sistema CSAM. As viscosidades foram calculadas utilizando o sotware FactSage. 7.3 (para Fase Líquida) e a equação Roscoe-Einstein com auxílio do FactSage. 7.3 (para Fase mistura) para um total de 15910 escórias. Os resultados preliminares indicaram que existe uma convergência significativa entre os dados das viscosidades calculadas e experimentais.A minor change in the chemical composition and temperature affects the slag viscosity, which has a great impact of the physical properties influencing refining slags. Optimizing those parameters may affect the steel cleanliness. The viscosity measurement process is considered expensive, so the costeffectiveness does not favor the measures at high-temperatures. Alternatively, it is possible to apply mathematical models to calculate viscosities of slags for a given range of chemical composition and temperature. The present work presents a validation of the viscosity experimental data, collected in the literature, with calculated data via FactSage in this work. Also proposes an accurate representation of iso-viscosity curves applied for secondary steelmaking slags, covering the composition ranges: 0–100 wt.% CaO, 0–100 wt.% SiO2, 0–100 wt.% Al2O3 and 0–15 wt.% MgO (CSAM) system at 1500ºC to 1700°C. The viscosity representation fields include fully liquid and partially liquid slag in the CSAM system. The viscosities were calculated using the FactSage 7.3 (for Liquid Phase) and the Roscoe-Einstein equation (for multiphasic systems) for a total of 15910 slags compositions. The preliminary results indicated that there is a significant convergence between the calculated and experimental viscosities data. It is promoting an efficient approximation of the iso-viscosity curves for the CSAM slag system in the high-temperatures

Assessing the state of implementation of the National Archives and Records Management act at Eduardo Mondlane University in Mozambique

Archival legislation is a crucial tool for the public sector to ensure the management, preservation and access of a country’s national documentary heritage. In Mozambique, archival legislation has been enacted which sets the scene for records appraisal and disposition, as well as classification schemes and retention schedules for administrative records of governmental bodies falling under the auspices of the Act. As a result, public agencies in Mozambique are required by the archival legislation to adopt a systematic and organized approach to the management of their records from creation to disposal. Despite this, the records management processes of many public entities in Mozambique have remained ineffective and inefficient. This study utilized the record life cycle concept as a framework to assess the state of implementation of the National Archives and Records Management Act at Eduardo Mondlane University (EMU) in Mozambique. The study applied a quantitative research approach with triangulation of data collection tools, namely, questionnaire and document analysis. The study revealed that EMU has only established one central records appraisal and disposal committee for its directorate units, which has not coped with the records management demands from other academic units such as faculties, schools and research centers. In most of the academic units the records management staff were not involved in the training, records appraisal and disposal processes, as well as in the destruction and/or transfer of records to the Mozambique Historical Archives (MHA), as required by legislation. The study concludes that most EMU units do not comply with archival legislation resulting in few provisions of the Act being implemented. The study therefore recommends that the records management function at EMU should put in place the basic procedures of control for records management systems with the leadership taking a proative role in the strategic planning, budgeting and monitoring. A further empirical study on the assessment of the state of implementation of the National Archives and Records Management Act throughout the entire public sector in Mozambique is recommended.Information ScienceM. Inf. (Archival Science

Sound synchronization of bubble trains in a viscous fluid : Experiment and modeling

Acknowledgements: We thank the São Paulo State Agency FAPESP and the Federal Brazilian Agency CNPq for the financial support. M.S.B. acknowledges EPSRC Grant No. EP/IO32606/1.Peer reviewedPublisher PD

Margem muro

Anais do V Encontro de Iniciação Científica e I Encontro Anual de Iniciação ao Desenvolvimento Tecnológico e Inovação – EICTI 2016 - 05 e 07 de outubro de 2016 – Sessão Linguística, Letras e ArtesDurante a sabida trajetória do coletivo de nossa espécie pela extensão da esfera terrestre, poucas manifestações de nossa característica industria se mostraram tão resilientes (e em tamanha cumplicidade) quanto o objeto “muro”, tão pluralmente encarnado, ante as distintas carências humanas — desde seu advento. Suas propriedades plásticas — para além de suas funções basilares — constituem caracteres emblemáticos que sobremaneira transcendem sua palpável existência em significações outras, igualmente relevantes. Pensá-lo enquanto constante — em relação ao sabido desvelar da experiência humana — nos empodera a investigar sua intrínseca relação com os campos da expressão e da arte, tanto nos primórdios de nossa experiência quanto no presente estado de nossa marcha. O projeto presente, portanto, se caracteriza pela investigação aprofundada do fenômeno que, em um momento anterior (nos 6 meses que antecederam a feitura da presente empresa), verificamos em pesquisa de campo: a ocupação do muro por meios artístico-expressivos na região das três fronteiras (Brasil, Argentina e Paraguai). Partindo, por conseguinte, dos questionamentos originados desta primeira experiência, propomos assim uma análise deste objeto com o fito de melhor situar os processos com os quais nos deparamos em campo, nos entornos da fronteira

An inside view on changes to achieve efficiency

Software development is a discipline that is almost as old as the history of computers. With the advent of the Internet and all of its related technologies, software development has been on high demand. But, and especially in SME (small and medium enterprise), this was not accompanied with a comparable effort to develop a set of sustainable and standardized activities of project management, which lead to increasing inefficiencies and costs. Given the actual economic situation, it makes sense to engage in an effort to reduce said inefficiencies and rising costs. For that end, this work will analyze the current state of software development’s project management processes on a Portuguese SME, along with its problems and inefficiencies in an effort to create a standardized model to manage software development, with special attention given to critical success factors in an agile software development environment, while using the best practices in process modeling. This work also aims to create guidelines to correctly integrate these changes in the existing IS structure of a company

The impact of brazilian crisis on export and non-export stocks

Considering that Brazil is currently one of the major emerging economies in the world through this work is possible to compare the returns of before and after the 2015 crisis peak (GDP = - 3.8%) with the evolution of the principal stock exchange in Brazil (IBOVESPA). As known, the exchange rate is the major source of macroeconomic uncertainty is important to understand if the export companies have a higher profitability than non-export companies. As basis for this work, I used the 407 companies listed in IBOVESPA, being separated between: Exporters and Non-Exporters. The analysis continued using Log Return and in the end, I was able to prove that the differences in the daily returns of the companies that export are statistically higher than those that do not export, making it clear that even in a critical period like 2014 to 2016 it is possible profitability vis-à-vis non-exporters.Considerando que o Brasil é atualmente uma das principais economias emergentes do mundo através deste trabalho é possível comparar os retornos de antes e após o pico de crise de 2015 (PIB = -3,8%) com a evolução da bolsa no Brasil (IBOVESPA). Como é sabido, a taxa de câmbio é a principal fonte de incerteza macroeconômica e é importante para entender se as empresas de exportação têm uma maior rentabilidade do que as empresas não-exportadoras. Como base para este trabalho, usei as 407 empresas listadas no IBOVESPA, sendo separadas entre: exportadoras e não exportadoras. A análise continuou usando Log Return e, no final, eu consegui provar que as diferenças nos rendimentos diários das empresas que exportam são estatisticamente superiores às que não exportam, deixando claro que mesmo em um período crítico como 2014 para 2016 é possível uma maior rentabilidade em relação aos não exportadores