En el presente trabajo se reporta la síntesis y caracterización morfológica de nanotubos de ZnO, fabricados a partir de semillas de óxido de zinc fabricadas por el método del rociado pirolítico. El crecimiento de los nanotubos de ZnO se llevó a cabo sumergiendo los sustratos con las semillas de ZnO en una solución acuosa de nitrato de zinc y metenamina. Las muestras fabricadas bajo diferentes condiciones se analizaron en su morfología por Microscopia Electrónica de Barrido.

PROCYT 226- 2008 -CONCYTEC-OAJ

In this article an exploratory analysis of the measurement of use of quality systems and their implications in business performance is done, taking as reference a case study in four meat producing companies of a Northern Mexican County. The main contribution of this work is based on a mixed methodology analyzed by means of the Preferential Weighting of Criteria. The results thread coincidences with other investigations, that conclude that quality systems increase enterprise performance in the productions and sales amounts.

In this article an exploratory analysis of the measurement of use of quality systems and their implications in business performance is done, taking as reference a case study in four meat producing companies of a Northern Mexican County. The main contribution of this work is based on a mixed methodology analyzed by means of the Preferential Weighting of Criteria. The results thread coincidences with other investigations, that conclude that quality systems increase enterprise performance in the productions and sales amounts.

sponce@ulima.edu.pe;jquinof@ulima.edu.pe;agutarra@ulima.edu.pe

SPONCE@ulima.edu.pe

This paper focuses on the synthesis of cobalt ferrite nanoparticles by the sol–gel method and their photocatalytic activity to eliminate bacteria in aqueous media at two different scales: in a laboratory reactor and a solar pilot plant. Cobalt ferrite nanoparticles were prepared using Co(II) and Fe(II) salts as precursors and cetyltrimethyl ammonium bromide as a surfactant. The obtained nanoparticles were characterized by X-ray diffraction, scanning and transmission electron microscopy. Escherichia coli (E. coli) strain ATCC 22922 was used as model bacteria for contact biocidal analysis carried out by disk diffusion method and photocatalysis under an ultraviolet A (UV-A) lamp for laboratory analysis and solar radiation (radiation below 350 W/m2 in a typical cloudy day) for the pilot plant analysis. The results showed that cobalt ferrite nanoparticles have an average diameter of (36 ± ...