El texto completo de este trabajo no está disponible en el Repositorio Académico UPN por restricciones de la casa editorial donde ha sido publicado.

El texto completo de este trabajo no está disponible en el Repositorio Académico UPN por restricciones de la casa editorial donde ha sido publicado.

The objective was to implement a semolina percentage recognition system using near-infrared spectroscopy (NIR) and multivariate data analysis. For this purpose, 6 samples were an aly zed with different percentages ofsemolina(20, 4 0, 6 0, 8 0 an d 100 %). Samples were repeated 20 times. The observed NIR sp ect rum was absorbance in the range of 1100 and 2500 nm. In order to reduce the data, the analysis of main components was used by testing 24 classification models, from which the one that reached the highest level of precision was the Linear Support Vector Machine (SVM) algorithm, reaching 98.8%, achieving fairly satisfactory discriminatio n with values of PC1 (99.7%), PC2 (0.3%) and PC3 (0.1%), reachin g a total cumulative variation of the contribution of th e first 3 P Cs o f 99.9%. Partial Least Regression (PLS) models applied to NIR- spectra showed R2 between 0.9388. These values d...

The objective was to implement a non-invasive classification system for green coffee beans by using near-infrared spectroscopy (NIR) and multivariate data analysis. For this, 4 types of coffee were analyzed, according to variety and geographical location. The samples were repeated 5 times. The observed NIR spectrum was absorbance in the range of 1100 and 2500 nm. In order to reduce the data, the analysis of main components was used by testing 24 classification models, from which the one that reached the highest level of precision was the Linear Support Vector Machine (SVM) algorithm, reaching 98.8%, achieving fairly satisfactory discrimination with values of PC1 (97.9%), PC2 (1.9%) and PC3 (0.1%), reaching a total cumulative variation of the contribution of the first 3 PCs of 99.9%. These values demonstrated that NIR spectroscopy is a valid alternative for classification by geographical ...

El objetivo de esta investigación es analizar el control de proyectos de responsabilidad social empresarial en el sector minero con la finalidad de proponer indicadores indicadores relevantes de responsabilidad social ajustado a las necesidades de los proyectos desarrollados por dichas empresas. La metodología se dividió en 1) Identificación de los principales indicadores de Responsabilidad Social en proyectos mineros; 2) Revisión por expertos de los índices de responsabilidad identificando criterios relevantes en minería; y 3) Identificación y diseño de los indicadores de Responsabilidad Social Empresarial. En la primera etapa se analizaron ocho proyectos de Responsabilidad Social Empresarial con financiamiento minero de US $ 6 000 000.00. En la segunda etapa se identificaron diez criterios usados en proyectos mineros. Finalmente, se seleccionaron cinco criterios prioritarios: ...

In this work a study of biomass production from deproteinized serum of cheese was made by using yeast Kluyveromyces fragilis from the Spanish Type Culture Collection with the objective of providing an alternative of use for the subproduct “serum of cheese”, since this product is highly pollutant. Ammonium salts, potassium, magnesium, calcium, iron, zinc and manganese were added to the deproteinized serum obtained by acidification and warming. PH was adjusted to 4.5; the yeast was sterilized and inoculated. The maximum rate of growing for the yeast was of 0.0398 h-1 and the coefficient of biomass produced per unit of mass of substrate consumed was of 0.272. A model of screening of Placket Burman design with 11 variables was generated, resulting as the most important ones: the deproteinized serum of cheese, yeast extract and ferrous sulfate FeSO4, being the first one the most significa...

The goldenberry (Physalis peruviana) is a highly perishable Andean fruit with valuable nutritional and functional properties. Its preservation poses a challenge due to its high moisture content. This study presents an integrated method combining infrared thermography (IR) and irreversible thermodynamics to characterize the convective drying process of goldenberry.Samples were dried at 60 ◦C and 1.0 m/s air velocity. Weight loss, surface temperature, and water activity were recorded over 13 h using thermocouples, precision balances, and IR imaging. An irreversible thermodynamic model was applied to estimate water flux, free energy changes, and chemical potential gradients, including mechanical energy effects. The phenomenological coefficient from Onsager’s relation was correlated with water flux to describe internal water migration. IR thermography enabled real-time, non-invasive moni...

This work was supported by FONDECYT CONCYTEC-Peru.

The idea of using microalgae as a biosource of biodiesel is being taken seriously because of the escalating price of fossil fuel. The objective the research was to determine the optimal levels of concentrations of sulfate, carbonate, nitrate and phosphate in the performance of biomass, by assessing the individual and combined effect of concentrations on the growing of the microalgae, through the application of a type-24 factorial experimental design in the performance of Botryococcus braunii biomass isolated in the high-Andean zone of Cajamarca-Perú. According to the results of the study of individual effects of these four salts, it was stated that carbonate and nitrate salts have significant effect on the growing of Botryococcus braunii (p<0.05). This was characterized by using a chromatography equipment of gases adapted to mass and it was found that hydrocarbons generated have 26 to 3...

Determinar los factores académicos asociados a la procrastinación general. Métodos: Se realizó un estudio transversal analítico en estudiantes de una universidad particular en la serranía peruana, como resultados preliminares tomados en todas las facultades de una universidad en la ciudad de Huancayo- Perú. Los procrastinadores fueron los estudiantes que estuvieron en el tercio superior del puntaje total de un test validado, luego se asoció a factores educativos. Se obtuvieron estadísticos de asociación.

Currently, the use of natural resources, the challenge of laws and environmental sustainability, as well as waste management, receive considerable attention. The research aims to analyze the circular economy as a strategy in the management of waste electrical and electronic equipment, through a descriptive, nonexperimental study, considering the discarded laptops in a university. The study was carried out in two stages: The first, a proposal for a remanufactured product where the potential of laptop parts to be recycled based on 110 recycled equipment was examined; the second, a business strategy based on the circular economy, in order to identify the perception of the offer of remanufactured computers, for this purpose a tool validated by experts was designed, which was applied to 367 university students. As a result, the relationship between the socioeconomic level and the acceptance o...

The work was funded by Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica-CONCYTEC according to agreement at Sub project 072–2018–FONDECYT–BM–IADT–AV.