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Valdes-Pena M.D.,University of Vigo | Fernandez Freijedo J.,University of Vigo | Fernandez Freijedo J.,Galician Automotive Technology Center | Moure Rodriguez M.J.,University of Vigo | And 5 more authors.
IEEE Transactions on Nanotechnology | Year: 2013

In current CMOS nanometer technologies, aging effects may appear after relatively short operating times, compared to the expected lifetime of circuits. Therefore, there is an increasing need for on-chip aging monitoring, especially in high-performance, safety critical systems. This paper presents a programmable aging sensor that can be embedded in field-programmable gate array (FPGA)-based designs, using standard resources available in those devices and with minimal impact on the standard FPGA design flow. Given the limited amount of resources required by the sensor, it can be instantiated not only in the critical paths of a circuit, but also in those that may be identified to be more likely affected by aging effects. Experimental results, obtained in circuits of increasing complexity (where several sensors need to be used), are presented and discussed, demonstrating the good performance of the proposed sensor, as well as its low cost in terms of area overhead and power consumption. Results of aging experiments based on the standard US MIL-STD-883 Method 1015.50 'Burn-In Test' are also reported, demonstrating that the effect of aging on the sensor is negligible compared to that on the circuit under test, which is a key point for practical applicability. The proposed approach provides a novel and efficient solution to the specific FPGA design problems in this context, which are different from those addressed in application-specific integrated circuit design. © 2002-2012 IEEE. Source


Santos C.S.C.,University of Aveiro | Gabriel B.,University of Aveiro | Blanchy M.,R and D unit Rescoll | Menes O.,Instituto Tecnologico del Plastico | And 4 more authors.
Materials Today: Proceedings | Year: 2015

Nanotechnology describes the characterization, fabrication and manipulation of structures, devices or materials that have one or more dimensions that are smaller than 100 nanometers. This area has established itself as a key enabling technology for a wide range of applications, thus becoming a top priority for science and technology policy development, being already used in hundreds of products among the industrial sector, namely, electronic, healthcare, chemical, cosmetics, composites and energy. Despite the development in this area, there are some obstacles to a greater impact of nanotechnology in industry. The lack of information concerning this scientific area, the possibility of adverse impacts of nanotechnology on the environment, human health, safety and sustainability, are still a challenge. This article intends to briefly the prototypes being developed with in the CarbonIspired 2.0 consortium, given with them examples of practical applications, security issues and market challenges in order to an effective collaboration between the academies, research centers and the industrial sector. © 2015 Elsevier Ltd. Source


Otero J.,University of Vigo | Iris M.L.,Galician Automotive Technology Center | Correa J.M.,University of Vigo | Correa A.,University of Vigo | Cerdeira F.,University of Vigo
19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7 | Year: 2010

The quality of a commercial biodiesel and their blends with diesel fuel, and the flash point temperature were studied. The values obtained were correlated with other quality properties, e.g., density and the kinematic viscosity. All blends demonstrated composition dependent on behavior, and its flash point increased nonlinearly with biodiesel l% in the blend. The experimental data were correlated with the biodiesel mass fraction, and the best fit was obtained using a sixth order polynomial equation. The flash point temperature increased nonlinearly with the density and kinematic viscosity of the blend. In this case, the best correlation was obtained using the proposed empirical equation. This is an abstract of a paper presented at the 19th International Congress of Chemical and Process Engineering and 7th European Congress of Chemical Engineering (Prague, Czech Republic 8/28/2010-9/1/2010). Source


Alvarez E.,University of Vigo | Iris M.L.,Galician Automotive Technology Center | Cerdeira F.,University of Vigo | Andrade S.,Galician Automotive Technology Center | Vazquez M.E.,University of Vigo
19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7 | Year: 2010

The kinematic viscosity of the commercial biodiesel, and their blends with diesel fuel as function of temperature, was studied. Nineteen different blends were prepared from the pure components, varying the percentage of biodiesel in steps of 5% vol. All systems exhibited demonstrate a temperature-dependent behavior, and their dynamic viscosities decrease with temperature. The viscosity increased nonlinearly with the biodiesel mass fraction in the blend. In this case, the best correlation was obtained using a polynomial equation. This is an abstract of a paper presented at the 19th International Congress of Chemical and Process Engineering and 7th European Congress of Chemical Engineering (Prague, Czech Republic 8/28/2010-9/1/2010). Source


Valencia M.,Galician Automotive Technology Center | Lopez E.,Galician Automotive Technology Center | Andrade S.,Galician Automotive Technology Center | Iris M.L.,Galician Automotive Technology Center | And 3 more authors.
Catalysis Communications | Year: 2014

The Selective Catalytic Reduction (SCR) of NOx has been performed in a real diesel exhaust stream with commercial diesel fuel by using a full size home-made Pt/beta zeolite/honeycomb prototype catalyst. Fuel was injected upstream of the catalyst to achieve total hydrocarbon concentrations between 1000 and 5000 ppm, and the SCR behavior observed was similar to that typically reported in laboratory experiments performed with model hydrocarbons. Typical NOx removal volcano-shape profiles, with maxima at 250 C for all THC inlet concentrations, were obtained, with an optimum THC concentration of 3000 ppm. © 2013 Elsevier B.V. Source

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