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34 results on '"Ortega F"'

3. CATALYTIC PYROLYSIS OF DISCARDED COVID-19 MASKS OVER SEPIOLITE.

Author

Martín-Lara, M. A., Ortega, F., Pula, H. J., Sánchez, P., Zamorano, M., and Calero, M.

Subjects
MEERSCHAUM, PYROLYSIS, MEDICAL masks, COVID-19, VISCOSITY
Abstract

This research aims to develop a new strategy to valorize wasted COVID-19 masks based on pyrolysis to convert them into useful products. First, surgical and FFP2 masks were thermally pyrolyzed at temperatures of 450-550 °C with the purpose of determining gas, liquid (oil) and solid (char) yields. At low temperatures, solid yield was high, while at high temperatures the gas product was enhanced. The highest yield of liquid was found at an operating temperature of 500 °C in both surgical and FPP2 masks pyrolysis. The liquid product yields were 59.08% and 58.86%, respectively. Then, the volatiles generated during thermal pyrolysis of residual masks were cracked over sepiolite as catalyst at a temperature of 500 °C. The catalytic pyrolysis increased the yield of gas product (43.89% against 39.52% for surgical masks and 50.53% against 39.41% for FFP2 masks) and decreased the viscosity of the liquid product. Finally, the effect of sepiolite regeneration and reuse in consecutive pyrolysis tests was examined. Results showed that, with the higher regeneration-reuse of sepiolite, the catalyst was degraded obtaining a liquid product with higher molecular mass. This effect was hardly noticeable in the case of FFP2 masks. [ABSTRACT FROM AUTHOR]

Published
2022
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13. Analysis of the success factors and failure causes in Information & Communication Technology (ICT) projects in Spain.

Author

Montequin, V. R., Cousillas, S., Ortega, F., and Villanueva, J.

Subjects
BUDGET, PROJECT management, SUCCESS, STAKEHOLDERS, PROJECT managers
Abstract

Projects are complex works subjected to significant lime, budget and quality constraints. One or the greatest challenges in project management still remaining unsolved is determining what is necessary to do in order to achieve success or failure. According to the specialized literature, both concepts of success factors and failure causes in projects are largely subjective and therefore difficult to quantify, depending on the point of view of the stakeholders involved. This paper tries to determine the most frequent failure causes and the most important success factors for ÍCT projects carried out in Spain within the framework of a much wider research, by means of a worldwide empirical survey carried out among project managers intended to gather their personal perceptions. The survey is based on a questionnaire anonymously distributed through a professional internet network. [ABSTRACT FROM AUTHOR]

Published
2014
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