Abstract:The necessity of sustainability evaluation is rapidly growing alongside the expansion of civilization. Likewise, the supply chain suitability improvement is a need that has arisen in the petroleum industry, especially as it is responsible for the most part of CO 2 emissions in the atmosphere. The modeling of this kind of problem deals with multiple criteria evaluations. This paper proposes an original multiple-criteria based approach to classifying the degree of organizational sustainability. This proposal was applied to evaluate a representative set of companies, which are suppliers of the Brazilian petroleum industry. The data collection was supported by a questionnaire. The results highlight that the studied companies have not yet reached an advanced level of maturity in the sustainability context. In a comprehensive vision of sustainability based on Triple Bottom Line (TBL), these companies are either in the initial stage or in the implementation phase of the sustainability practices.

<p><em>This article provides a better understanding from the literature on the multi-disciplinary processes management and on large critical projects, in multiple environments, in an oil operator. A bibliographic panel was prepared, from a bibliometric research, focusing on portfolio, projects, operations and resources. The analysis of the literature was made from the perspective of integration of processes, taking as fundaments their interdependencies and multidisciplinary aspects. There was no evidence that integration is a reality in processes so large and multi-disciplinary, as well as in multiple environments with large projects. However, good practices were found and they are related to isolated cases. This study identified and separated issues that are inherent to the studied processes, from the ones that are result of poor integration and immaturity of the processes which are of vital importance for the construction of an integrated and multidisciplinary model. This article takes a critical look on how the treatment of such aspects add value through the identification of the interfaces, that are important in organizations that operate in multiple environments projects, together with production operations.</em></p>

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Two methods of volume measurement were compared, to develop a simple and reliable method for estimating the whole-antler density. We used 10 cast antlers, previously dried and weighed, from 10 different red deer (Cervus elaphus hispanicus) individuals. The volumes were determined by the traditional Archimedes method versus a new parametric volume-modelling technique using a ‘computer-aided design-three dimensions’ (3D-CAD), which is now being used in the biomedical industry in applications such as medical-implant design, tissue engineering and in developing a better understanding of anatomical functionality and morphological analysis. The process paths to follow in the generation of CAD models from cast antlers were described. The whole-antler density was estimated from the weight and volume measurement and a paired-sample comparison procedure was performed to assess differences between volumes as well as densities. Cast-antler weight ranged from 219.93 to 1857.9 g, and the volume estimated by the hydrostatic method was 732.45 ± 474.06 cm3 and by the CAD-3D method it was 730.65 ± 492.59 cm3. The DM density of the antler by the hydrostatic method (Density A) was 1.112 ± 0.120 g/cm3, ranging from 0.915 to 1.345 g/cm3 (Shapiro–Wilks, P = 0.449), and by the 3D-CAD method (Density B) it was 1.112 ± 0.158 g/cm3, ranging from 0.939 to 1.326 g/cm3 (Shapiro–Wilks, P = 0.751). There were no differences in the volume (t = 0.95, P = 0.37) or density (t = 0.54, P = 0.60) between the two methods and the correlation coefficient between Density A and Density B was 0.968. Both methods had similar reliability, although the computing process with the 3D-CAD system calculated antler volume faster than did the traditional hydrostatic weighing. 3D-CAD also avoided cast damage and the methodological problems with larger or smaller antlers or with floatability due to low density, which occur when using the hydrostatic method.

Resumo: O presente estudo de caso aborda o setor logístico de uma empresa multinacional do ramo perfuração de petróleo. Apresentando todo conceito e ramificação da logística e tendo como objetivo conhecer as suas principais deficiências desde o setor de recebimento ao setor de armazenamento onde cada processo foi devidamente analisado e registrado. Foram encontradas diversas dificuldades como: Materiais sem identificação, divergência entre o estoque físico e o estoque contábil, material sem registro no sistema, armazenamento planejado indevidamente, custos excessivos, entre outros pontos negativos. Com o objetivo de solucionar esses problemas e trazer melhorias para o setor foi implantado um plano de ação referente a um inventário desses materiais, onde todos os materiais foram avaliados, realocados e receberam placas identificadoras, o que resultou na solução de grande parte dos problemas encontrados. Como proposta efetiva de solução, foi apresentado o sistema RFID (Radio frequency identification) de rastreamento, retratando todo o conceito, instalação e integração, destacando todos os benefícios e vantagens como também possíveis desvantagens obtidas com a implantação.

No abstract

Modern wind turbines employ thick airfoils in the outer region of the blade with strong adverse pressure gradients and high sensitivity to flow separation, which can be anticipated by leading‐edge roughness. However, Reynolds average Navier‐Stokes simulations currently overpredict the Reynolds shear stresses near the surface, and the flow separation is not correctly predicted. Hence, these methods are not representative enough to optimize the blade design to avoid flow separation, which becomes relevant for rough blades. While several eddy‐viscosity corrections in the k−ω−SST turbulence model have been previously studied to predict flow separation over smooth airfoils, the present study aims to extend their applicability to airfoils with leading‐edge roughness. Two corrections, whose effect on flow physics has not been empirically quantified, are addressed. Particle image velocimetry measurements have been performed on a 30% thick airfoil to quantify the impact of these corrections. The reduction of the eddy viscosity introduced by the corrections leads to a shift of the peak location of the Reynolds shear stresses away from the surface, which, in turn, promotes flow separation and improves the prediction of the mean velocity and the pressure‐coefficient distribution. Besides, the ratio between the main turbulent shear stress and turbulent kinetic energy is demonstrated to be lower than the standard value used in the k−ω−SST turbulence model at the boundary‐layer outer edge. Adjusting this ratio for an angle of attack of 0° decreases the error on the predicted lift and drag coefficients from 75% to 3% and from 58% to 39%, respectively.

Na literatura científica há indícios de que a adoção de ferramentas de e-procurement melhoram o desempenho das organizações em diversos aspectos. Mas, como estas empresas percebem os impactos oriundos da adoção de ferramentas de eprocurement em seus negócios? Essa percepção é semelhante a do fornecedor desse tipo de serviço? Apesar das pesquisas reportadas na literatura, estas questões permanecem pendentes. O presente trabalho apresenta e aplica, um questionário para o mapeamento e contraste dessas percepções, permitindo a identificação de aspectos a serem melhorados para o caso particular estudado.