The objective of this research was to evaluate the compressive strength of the 350 kg / cm2 design concrete manufactured in the city of Huancayo, using coarse and fine aggregates with recycled extruded polystyrene (XPS) materials, washed and unwashed, duly scratched unwashed expanded polystyrene (EPS) in pearl shape. Samples of polystyrene waste were taken in recreational and public service facilities and aggregates from quarries near the city of Huancayo that were subjected to quality control tests according to the Peruvian technical standard NTP 400.037. Different mixtures consisting of recycled polystyrenes and aggregates were made for the manufacture of concrete, the compressive strength was analyzed in a specialized laboratory. The results showed that the concrete mix made with recycled and washed XPS, whose proportion was 30% coarse aggregate per XPS and 20% fine aggregate per XPS,...

In the industry every time more is generalized the manufacture of varied products of simultaneous way with similar values, denominated joint products from the same raw material and/or process of manufacture, giving rise to the joint cost. Then the Engineer of Processes faces the necessity to calculate the costs of these individual products, task that often is a cornplex subject since the joint costs are not specifically identifiable with some of the products that are making in simultaneous form. The intention of this eighth part is to provide the excellent models, methodology and criteria of how it must assign the joint costs to each joint product.

In the industry every time more is generalized the manufacture of varied products of simultaneous way with similar values, denominated joint products from the same raw material and/or process of manufacture, giving rise to the joint cost. Then the Engineer of Processes faces the necessity to calculate the costs of these individual products, task that often is a cornplex subject since the joint costs are not specifically identifiable with some of the products that are making in simultaneous form. The intention of this eighth part is to provide the excellent models, methodology and criteria of how it must assign the joint costs to each joint product.

The inadequate final disposal of hazardous industrial waste, such as bentonite used in the refining processes of contaminated automotive lubricants, generates a series of negative environmental impacts on water, air and soil resources. To contribute to the minimization of these impacts, the purpose of the present investigation was to evaluate the biodegradation capacity of a sample of automotive lubricating oil trapped in bentonite clay, using the bacterial consortium Oil Eating Microbes (Rodhococus pyridinivorans, Pseudomonas montielli and Bacillus sp.). To obtain the maximum performance of the biodegradation of the oil (reduction of total hydrocarbons of oil in the clay), by the bacterial consortium, two experimental tests were carried out, in a five liter capacity bioreactor, where the concentration of biodegradation of total petroleum hydrocarbons was measured, the first was performe...

La investigación tuvo como objetivo evaluar el efecto de la suplementación de probióticos naturales y comerciales sobre el rendimiento productivo de cuyes en crecimiento. Se emplearon 48 cuyes machos destetados, raza Perú. Se determinaron la ganancia de peso, consumo de materia seca, conversión alimenticia y rendimiento de carcasa. Se utilizó un diseño completo al azar con cuatro tratamientos, seis repeticiones por tratamiento y dos animales por repetición. Los tratamientos fueron T1: Dieta control (DC); T2: DC + Probiótico Natural (PN) (2 ml); T3: DC + Probiótico Comercial (PC) (2 ml) y T4: DC + PN (1 ml) + PC (1 ml). El PN contenía: Bacillus pumilus, Lactobacillus frumenti, Streptococcus thoraltensis, Lactobacillus johnsoni y el PC: Lactobacilus rihamnosus y Enterococos faecium. No se encontraron diferencias significativas (p > 0,05) en los parámetros evaluados; sin embargo...

The waters of rivers, seas and lagoons contaminated by various sources, whether of natural or anthropogenic origin, contain polluting substances, among them they present a high bacterial load, which does not allow human consumption because it causes damage to human health. Therefore, the research carried out presents the study of the photocatalytic effect of zinc oxide nanoparticles (ZnONPS) as its mechanism of biochemical interaction with the consequent formation of reactive oxygen substances (ROS) and thus propose the interpretation of its subsequent Bactericidal effect by generating cellular damage in Staphylococcus aureus bacteria. According to the results obtained in an experimental pilot work, the decrease in colony formation evaluated through the plate culture method was reported, and it was determined that the concentration of 10- 4 g of ZnONPs/ mL of ZnO nanoparticles (synthesiz...