In the present theoretical analysis, is described the occurrence of thermal shock wave that is produced by the located heat delivery. The general analysis is made considering that the physical properties of the flow changes when crossing this wave. Thus also, for practical cases; its observed that these properties vary slightly in an ample range of temperature, so also is analyzed the formation of this wave without variation of the physical properties of the flow; showing that in the flow only cannot appear dynamic shock waves, but also thermal shock waves.

The construction of coastal ports requires the use of materials that meet the demands of the marine environment, to prevent underwater concrete structures from cracking and spalling easily; basalt fiber is used to delay the expansion of concrete and prevent the formation of cracks. This research studies the behavior of concrete for prefabricated piles with Portland Cement Type I and basalt fibers added in 0.1%, 0.3% and 0.6%; the results indicate that the fiber is suitable for concrete, the slump decreases, the compressive strength increases for specimens cured in tap water and sea water, the relationship between resistances does not vary, and the depth of carbonation decreases.

The study was carried out in the "Centro de Producción de Genética Superior (CENPROGEN-SUP)" in Valle de Condebamba district, Cajamarca region, Peru, with the objective of selecting male guinea pigs for breeding based on their selection index. A total of 80 male guinea pigs of the Cajamarca ecotype of the Facultad de Ingeniería en Ciencias Pecuarias (pure and crossbred FICP) of the National University of Cajamarca, as well from the Valley of Mangallana and from the Valley of Cholocal. The guinea pigs were fed alfalfa, concentrate and water ad libitum for 56 days. The daily weight gain (IPD) and total weight gain (IPT), final weight (PF), body length (LC) and feed conversion (CA) were evaluated. The crossed FICP had significantly better values for IPD, IPT, PF and LC (17.6±1.8 g, 979±98 g, 1328±134 g and 36.6 ± 1.3 cm, respectively) (p<0.05).) On the other hand, there were no di...

El estudio se desarrolló en el “Centro de Producción de Genética Superior (CENPROGEN-SUP)” en el distrito de Valle de Condebamba, región Cajamarca, Perú, con el objetivo de seleccionar cuyes machos para reproducción en función a su índice de selección. Fueron utilizados 80 cuyes machos del ecotipo Cajamarca de la Facultad de Ingeniería en Ciencias Pecuarias (FICP puros y cruzados) de la Universidad Nacional de Cajamarca, así como del Valle de Mangallana y del Valle de Cholocal. Los cuyes fueron alimentados con alfalfa, concentrado y agua a voluntad durante 56 días. Se evaluó el incremento de peso diario (IPD) y total (IPT), peso final (PF), longitud corporal (LC) y conversión alimenticia (CA). Los FICP cruzados tuvieron valores significativamente mejores para IPD, IPT, PF y LC (17.6±1.8 g, 979±98 g, 1328±134 g y 36.6±1.3 cm, respectivamente) (p<0.05). Por otro la...

Perú boasts a wide diversity of fine aroma cocoa that merits quantifying its total phenols, anthocyanins, and characterize sensory the liquor and nibs of cacao, in two fermentation systems: traditional and micro-fermentation. The studying samples were “Chuncho”, Señorita variety, Achoccha, Pamuco and Común, and SHU-1 variety. For the quantification of total phenols was prepared a hydroalcoholic extract (100mg/mL). To the sensory characterization were chosen thirteen attributes whose results were subjected to multivariate analysis using the principal components method. The amount of total phenols was lower in the liquor compared to cocoa nibs, except in the microfermentation of Señorita and Achoccha variety, and in the traditional fermentation of Señorita variety; being the anthocyanin content higher compared to nibs. The cocoa liquor of Achoccha, Común and Señorita varieties i...

Perú boasts a wide diversity of fine aroma cocoa that merits quantifying its total phenols, anthocyanins, and characterize sensory the liquor and nibs of cacao, in two fermentation systems: traditional and micro-fermentation. The studying samples were “Chuncho”, Señorita variety, Achoccha, Pamuco and Común, and SHU-1 variety. For the quantification of total phenols was prepared a hydroalcoholic extract (100mg/mL). To the sensory characterization were chosen thirteen attributes whose results were subjected to multivariate analysis using the principal components method. The amount of total phenols was lower in the liquor compared to cocoa nibs, except in the microfermentation of Señorita and Achoccha variety, and in the traditional fermentation of Señorita variety; being the anthocyanin content higher compared to nibs. The cocoa liquor of Achoccha, Común and Señorita varieties i...

El objetivo de la investigación fue determinar el comportamiento productivo de cuyes del Ecotipo Cajamarca (Valle de Condebamba - Mangallana) y el Ecotipo Cajamarca (Facultad de Ingeniería en Ciencias Pecuarias de la Universidad Nacional de Cajamarca). Se utilizaron 50 cuyes entre machos y hembras por procedencia. Se llevó acabo en el Centro de Producción de Genética Superior “CENPROGEN-SUP”. Se valoró el incremento de peso, consumo de alimento, conversión alimenticia, velocidad de crecimiento y rendimiento de carcasa. Los datos fueron analizados bajo un DCR, con un arreglo factorial de 2x2 (factor procedencia y sexo). Se realizó el análisis de varianza (α=0.05) y la diferencia de medias con la prueba de Tukey (p<0.05). El efecto de la procedencia de los cuyes no fue significativo para los parámetros evaluados (p>0.05). Sin embargo, se encontraron diferencias signifi...

Con el objetivo de encontrar diferencias, que nos puedan inducir a error, en las emisiones de metano en alpacas. Se utilizaron 8 alpacas macho, de dos años de edad; los cuales fueron distribuidos al azar en Grupo A (alimento fibroso ofrecido en forma entera, n=4) y el Grupo B (alimento fibroso ofrecido en forma molida n=4). Se evaluaron las emisiones de CH4 en la mañana y en la noche; utilizando un equipo portátil de medición de gases Gasmet DX-4030 Analyser. Para el análisis de los resultados se utilizó una regresión lineal mixta. No se encontraron diferencias estadísticas significativas (p<0.05) en el efecto de las dietas fibrosas sobre la producción de CH4 ni en el momento de evaluación (mañana o noche).

Funding This project is supported by the Medical Research Council—MRC grant number MR/S024654/1 and by the Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica—FONDECYT, grant number 033-2019. AJP is funded by the Wellcome Trust (108065/Z/15/Z).