Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Exile is an autobiographic experience, as well as a theme of philosophicalreflection in the works of María Zambrano. In this article I propose an interpretation of the figures of exile and the subject suffering exile that takes them as a Gedankenexperiment– that is an hypothetic and imaginative reasoning turning around a concreteexample – that allows Zambrano to develop a philosophical argument within the frame of figurative language. The interpretation allows me to follow the circulation of the figures and the influence they had in the development of Italian bio-political philosophy, most prominently in the works of Adriana Cavarero. Further, I argue that the figures of the exile, and the subject suffering exile, are understood philosophically as a limitinterior to the state in the works of both authors, and that this idea carries with it ethical consequences. I conclude that the method of writing figuratively is a conscious choiceof style that aims at making the ethical stance found in the philosophical elaboration effective on the level of the text.

Entrevista con María del Carmen Rovira Gaspar

Entrevista a José Luis Abellán

Introducción del monográfico

The use of Reclaimed Asphalt Pavement (RAP) in the production of asphalt mixtures has beenencouraged due to the scarcity of virgin materials. However, the use of high percentages of RAP(>30%) is conditioned to its susceptibility to failure under low temperatures and fatigue load. Inthis sense, adding rejuvenating agents can partially or fully restore the aged properties of therecovered asphalt binder. This study aimed to present a proposal for a pedagogical interventionwith recycled asphalt mixtures modified with the residual additive of vegetable oils for students ofthe Civil Engineering course. The proposed rejuvenating agent was vegetable oil sludge derivedfrom refining. The asphalt binder modified by this material must be submitted to physical andrheological tests and, based on this characterization, compose the recycled asphalt mixtures.Mechanical tests of tensile strength, permanent deformation, susceptibility to moisture, andstiffness will be performed as parameters of technical feasibility for the mixtures, as well as anenvironmental analysis through the circularity index of the RAP. Carrying out this study in CivilEngineering courses will open doors to scientific experience and analysis of materials used inpaving, allowing a range of opportunities in the performance of the future engineer, usingalternative sustainable materials.  

El diseño y fabricación de vehículos automotrices terrestres ha tenido una constante evolucióndesde su surgimiento. En tal sentido, el desempeño aerodinámico de este tipo de vehículos se haconvertido en un factor importante en el análisis integral del desempeño energético de las máquinasautomotrices. El objetivo de la presente investigación es establecer una propuesta de configuracióngeométrica en la carrocería del ómnibus DIANA modelo GD.01C que mejore el desempeñoaerodinámico del vehículo con la consecuente disminución del consumo de combustible. Para talfin, se efectuó un análisis aerodinámico, haciendo uso de la técnica de Dinámica de FluidosComputacional, en la carrocería con el modelo original y en la carrocería con las modificacionespropuestas. Se demuestra que el modelo modificado presenta un mejor comportamiento de lospatrones de flujo del aire, al existir una reducción de los mismos respecto al modelo original;asimismo se constata una apreciable reducción de la fuerza de resistencia aerodinámica entre ambosmodelos. El coeficiente de resistencia aerodinámica por presión promedio en el modelo original esde 1,1072 mientras que en el modelo propuesto es de 0,9088. Existe una marcada diferencia en elconsumo de combustible del ómnibus, asociada a la resistencia aerodinámica, con el modelo decarrocería original (94,895 L/año) y el ómnibus con el modelo de carrocería propuesto (74,498L/año). Finalmente, se concluye que la propuesta de configuración geométrica en la carrocería delómnibus constituye una solución viable para el mejoramiento del desempeño aerodinámico yenergético del vehículo.

The growing need for aggregates due to the growth of industrial production has led to a decrease inavailable resources. The marble and granite cutting industry generates a large volume of waste andin recent years the use of these in buildings has increased. Thus, with the expansion of productionin marble factories, the amount of waste cannot be stored and it becomes necessary to reuse thesewastes, especially in the manufacture of concrete products for construction purposes. The mainobjective of this study is to evaluate the physical and mechanical performance of concrete with thereplacement of coarse aggregate by residues from the process of cutting marble and granite. Astudy of the dosage and molding of the specimens in the dimensions of 10 cm x 20 cm was carriedout, with replacement of the coarse aggregate (crushed 9.5 mm) by levels of 40% and 60% ofmarble and granite residues (RMG), being evaluated the properties of the concrete through the tests of Strength to Simple Compression, Strength to Traction by Diametric Compression andDetermination of Water Absorption. The results allowed us to conclude that the replacement ofconventional coarse aggregate by marble and granite residues increased the compressive strength of9.68% and 11.42% and the tensile strength of 6.20% and 7.02 % for 40% and 60% RMG,respectively. A slight increase in water absorption was observed, being, therefore, indicated for useas an alternative aggregate for use in concrete.

This work presents a comparative analysis, through computer simulations, of sinusoidal oscillatorsof the Pierce, Colpitts and Clapp topologies employing a surface acoustic wave sensor model. Tocarry out the simulations, sinusoidal oscillators with a common emitter amplifier and an oscillationfrequency of 117 MHz and the surface acoustic wave sensor model based on the model of apiezoelectric crystal were chosen. The output data of the simulations were the amplitude and theoscillation frequency of the output voltage of the oscillators with the sensor model. From thecomparative analysis of the oscillation frequency of each oscillator, percentage errors of less than1% were found, which enables the use of the oscillators designed for the VHF frequency range.From the comparative analysis of the output voltage amplitude of each oscillator, it was found thatthe amplitude of the Clapp oscillator was 20% greater than the amplitude of the Colpitts oscillatorand 61.54% greater than the amplitude of the Pierce oscillator. With this result, it appears that theClapp oscillator is the most suitable to be used in this frequency range with the surface acousticwave sensor for the measurement of large samples of disturbances. On the other hand, Pierce andColpitts oscillators would be more suitable for measurements of small perturbation samples, sincetheir topologies have a smaller number of components, reducing the manufacturing cost.

The use of Reclaimed Asphalt Pavement (RAP) in the production of asphalt mixtures has beenencouraged due to the scarcity of virgin materials. However, the use of high percentages of RAP(>30%) is conditioned to its susceptibility to failure under low temperatures and fatigue load. Inthis sense, adding rejuvenating agents can partially or fully restore the aged properties of therecovered asphalt binder. This study aimed to present a proposal for a pedagogical interventionwith recycled asphalt mixtures modified with the residual additive of vegetable oils for students of

La integración de procesos combina varios procesos para reducir el consumo de recursos y lasemisiones nocivas, convirtiéndose en un activo importante para garantizar la sostenibilidad de losprocesos industriales. Este trabajo tiene el objetivo de establecer los indicadores de desempeñoenergético de una refinería de azúcar de caña mediante el análisis del uso de la energía y laintegración de calor. Se aplica un procedimiento que incluye las metodologías de análisis de laenergía y del Análisis del Pellizco, con el uso de HENSAD y Aspen Energy Analyzer. Sedeterminan el consumo específico de energía y los objetivos de desempeño energético, que sonindicadores de progreso en la mejora de la eficiencia energética. El diseño de modificación de lared de intercambiadores de calor permitió definir una unidad de intercambio de calor, al emparejarla corriente de vapor vegetal del tercer efecto con el agua dulce, ahorrando el 89% de agua deenfriamiento y el 0,79% de vapor. Los ahorros anuales de 1 010 571 USD, estimados en el análisisenergético y la integración de calor hacen factible la evaluación de proyectos de inversión en elárea de la energía.