No abstract

of fibreglass polyester composite and reutilisation of the glass fibre residue to obtain a glass-ceramic material.

Total and inorganic arsenic contents were analyzed in cooked seafood products consumed in Spain during the period July 1997-June 1998: hake, meagrim, small hake, anchovy, Atlantic horse mackerel, sardine, bivalves, crustaceans, squid, and salted cod. Various cooking treatments were used (grilling, roasting, baking, stewing, boiling, steaming, and microwaving). The results obtained were compared statistically with those found previously in the same products raw, and they showed that after cooking there was a significant increase in the concentration of total arsenic for salted cod and bivalves, and in the concentration of inorganic arsenic for bivalves and squid. The mean content of inorganic arsenic was significantly higher in bivalves than in any other type of seafood. For the Spanish population, the mean intake of total arsenic estimated on the basis of the results obtained in this study is 245 microg/day. The intake of inorganic arsenic (2.3 microg/day) represents 1.7% of the World Health Organization provisional tolerable weekly intake (PTWI), leaving an ample safety margin for this population, which has a very high consumption of seafood.

ResumenSe ha desarrollado un modelo matemático para relacionar la manufactura esbelta, la manufactura sustentable y la mejora continua con la eficiencia operacional y responsabilidad ambiental en la industria manufacturera en una región de México. El modelo fue desarrollado empleando la técnica de ecuaciones estructurales mediante mínimos cuadrados parciales y se demostró su capacidad predictiva. El modelo muestra también que los factores estudiados afectan los resultados financieros, la satisfacción de empleados, la cultura de sustentabilidad y el impacto medioambiental en plantas de manufactura discreta de Apodaca en México. El estudio establece las bases para análisis posteriores del modelo con el fin de predecir desempeños en la eficiencia operacional y sus variables clave, así como prescribir estrategias y tácticas para la adopción exitosa de los enfoques analizados. Esto permitirá lograr ventajas competitivas en calidad, costos, tiempo de entrega, flexibilidad e innovación.Palabras clave: manufactura esbelta, manufactura sustentable, mejora continua, eficiencia operacional, responsabilidad ambiental Abstract A mathematical model to relate lean manufacturing, sustainable manufacturing and continuous improvement with the operational efficiency and environmental responsibility in the manufacturing industry in a region of México was developed. The model was established using structural equations including partial least squares and demonstrated its predictive capability. The model also shows that the factors studied affect financial results, employee satisfaction, sustainable culture and environmental impact in manufacturing plants of Apodaca in Mexico. The study also lays the foundation for further analysis of the model, for predicting performance in operational efficiency and its key variables and for prescribing strategies and tactics for successful adoption of the approaches discussed. This will allow achieving competitive advantages in quality, cost, delivery time, flexibility and innovation.