Esta investigación tuvo como finalidad disminuir los tiempos de atención de las solicitudes de compra de la Universidad Técnica de Machala mediante la propuesta de mejoras al proceso de adquisiciones. Como primer objetivo se realizó un análisis del actual proceso de adquisiciones de la institución donde se determinó que el tiempo requerido para dar atención a una solicitud de compra era de 40 días laborables. A través del diagrama de Ishikawa se identificaron las causas que estaban generando estos altos tiempos de atención y mediante el diagrama de Pareto se logró determinar las tres principales causas que generaban este problema: La falta de capacitación del personal que interviene en el proceso de adquisiciones, la falta de personal en el departamento de compras públicas y el proceso obsoleto de adquisiciones. En el segundo objetivo se plantearon las mejoras para cada una...

The aim of the research was to soften rice husk by hydrothermal and alkaline pretreatments. Temperature was applied at 121 °C for three time periods (15, 30 and 45 minutes) and with NaOH in three concentrations (0,5, 1 and 1,5 %), it was stirred at 120 rpm for one hour, to adjust to pH 4,8; 20 % HCl was added, and 30 FPU of the enzyme β-glucosidase was added and stirred at 120 rpm at 50 °C for 144 hours. The application of 121 °C for 45 minutes achieved a 34,62 ± 0,79 % partial hydrolysis of cellulose to cellobiose and 18,14 ± 0,09 % total hydrolysis of cellulose to glucose and in the hydrolysates where it was pretreated with sodium hydroxide at 1,5 %, 8,39 ± 0,79 % cellobiose and 46,64 ± 0,30 % glucose were reached. The application of hydrothermal pretreatment favors the partial hydrolysis of cellulose to cellobiose.

The aim of the research was to soften rice husk by hydrothermal and alkaline pretreatments. Temperature was applied at 121 °C for three time periods (15, 30 and 45 minutes) and with NaOH in three concentrations (0,5, 1 and 1,5 %), it was stirred at 120 rpm for one hour, to adjust to pH 4,8; 20 % HCl was added, and 30 FPU of the enzyme β-glucosidase was added and stirred at 120 rpm at 50 °C for 144 hours. The application of 121 °C for 45 minutes achieved a 34,62 ± 0,79 % partial hydrolysis of cellulose to cellobiose and 18,14 ± 0,09 % total hydrolysis of cellulose to glucose and in the hydrolysates where it was pretreated with sodium hydroxide at 1,5 %, 8,39 ± 0,79 % cellobiose and 46,64 ± 0,30 % glucose were reached. The application of hydrothermal pretreatment favors the partial hydrolysis of cellulose to cellobiose.