This paper presents a methodology for the design and the implementation of a PID (Proportional-Integral-Derivative) using IMC (Internal Model Control) tuning method by means of experiments performed on organic banana. In this work, the parameters of the linear and nonlinear model of a cooling chamber for fruits are identified. Simulation studies and implementation of the PID-IMC closed-loop control system demonstrate that energy saving were obtained of the order of 20% with respect to the entire system. © 2020 IEEE.

Various hematological investigations have been made ​​on 100 healthy men, and the results compared with those obtained elsewhere, and in individuals of different races. The normal range of variability related to our environment and sea level have been set using statistical methods, in order to serve as a comparative basis for future observations.

The growth of Tetraselmis suecica was evaluated. The experiment was realized using the Response Surface Methodology (RSM) with Central Composite Rotational Design (CCRD) with two factors, pH and sanguaza/seawater concentration in the range of 7 - 9 and 2 - 5 % (v/v), respectively. The culture media were stirred by bubbling air constantly (0.07 L/s) and continuously illuminated with 40 W of fluorescent light in glass containers of 1.5 L capacity at a temperature of 22.5 ± 2.1 °C. Using the Gompertz mathematical model was determined that from an 8.0 of pH and a ratio of 3.5% of sanguaza/seawater, the Tetraselmis suecica achieves maximum growth. An 8.71 of pH and a ratio of 4.56% of sanguaza/seawater allow the Tetraselmis suecica maximum growth (logN/N0) of 0.659, with a 12.3% of prediction error by applying a mathematical model of 2nd order. According to the study, the values obtained in...

In the northern region of Peru, the agro-export sector has grown considerably in the last ten years. In Piura specifically, it can be seen a huge expansion in products such as grape, mango and banana. Cooling systems are important for the agro-export sector representing between 40 and 50% of total electricity consumption, so it is necessary to have efficient automated cooling systems that would meet high quality and performance standards.In this article, a model based on transfer function has been identified for the refrigeration pilot plant of the University of Piura and a PI controller has been designed for said model, comparing its performance in relation to the ON OFF controllers currently used in the Peruvian agro-industry. The control variable was the compressor frequency and the controlled variable was the internal temperature of the cold-room.The refrigeration pilot plant of the ...

The growth of Tetraselmis suecica was evaluated. The experiment was realized using the Response Surface Methodology (RSM) with Central Composite Rotational Design (CCRD) with two factors, pH and sanguaza/seawater concentration in the range of 7 - 9 and 2 - 5 % (v/v), respectively. The culture media were stirred by bubbling air constantly (0.07 L/s) and continuously illuminated with 40 W of fluorescent light in glass containers of 1.5 L capacity at a temperature of 22.5 ± 2.1 °C. Using the Gompertz mathematical model was determined that from an 8.0 of pH and a ratio of 3.5% of sanguaza/seawater, the Tetraselmis suecica achieves maximum growth. An 8.71 of pH and a ratio of 4.56% of sanguaza/seawater allow the Tetraselmis suecica maximum growth (logN/N0) of 0.659, with a 12.3% of prediction error by applying a mathematical model of 2nd order. According to the study, the values obtained in...

Have been carried out on 150 women hematologic determinations, apparently healthy, and the results obtained were subjected to statistical analysis and compared with similar studies that have been conducted in other parts of the world.

A lo largo del año 2020, el mundo está sufriendo los estragos de una pandemia de enfermedad por coronavirus, iniciada en 2019 (COVID-19) y causada por el coronavirus 2 del síndrome respiratorio agudo grave (SARS-CoV-2), reconocida el 11 de marzo de 2020 por la OMS como una pandemia global, afectando a más de doscientos países y territorios, y dando como resultado más de 116 000 muertes y más de 441 000 casos de recuperación. En el Perú, el aislamiento social obligatorio ha generado gran pérdida económica, traducida a pérdida de empleos. La falta de adecuados equipos de protección sanitaria que brinden condiciones de aislamiento físico seguro dificulta la posibilidad para regresar a un “estado de normalidad” del aparato productivo. Basados en esta problemática, el Centro de Estudios para Comunidades Saludables de la Universidad Ricardo Palma, se planteó diseñar y manu...