Nowadays, the use of electronic tongues has gained important in the food industry, due to the growth of the technology and its use in this sector. The present work shows the elaboration and optimization of an electrochemical sensors array based on polypyrrole doped with different chemical species for the modification of sensors as the first stage of an electronic tongue for the analysis of milk. The stability and variability was analyzed in the response presented by every sensor by means of the application of a technical electrochemistry known as cyclic voltammetry that was applied across the above mentioned sensors to the analyzed samples. To study the data, patter recognition statistic method known as Principal Component Analysis (PCA) was used and for the optimization of the modified sensors was used response surface analysis. The results obtained shows that sensor optimization genera...

En la presente investigación se ha estudiado las variables: fenómenos pluviales e impacto estructural, lo cual se centró en el estudio del impacto que ocasionan los diversos fenómenos pluviales que se presentan en el distrito de Huancabamba, específicamente en la zona urbana. En base a observar y obtener una muestra clara de cuáles son los efectos y como perjudica a la población el impacto de los fenómenos, se desarrolló una encuesta aplicada a la población, una ficha de observación orientada a las viviendas del distrito y una entrevista dirigida a los responsables máximos de DEFENSA CIVIL HBBA. En este proyecto se indicó en sus resultados los diversos fenómenos que tienen más presencia en la zona urbana del distrito, lo cual predomina “las lluvias”, se presentan las diversas características y efectos que tienen los fenómenos pluviales. Respecto a la ficha de observa...

Boron is an essential micronutrient for the development, strengthening and growth of the plants; however, range essentiality of this element is narrow producing that its determination in the soils is an aspect very important to warrant its phytoavailability within an optimum concentration range. At the present, the development of polymer materials based in polyurethanes (PUs) with controlled capacity of uptake and release, high weatherability, and which permit controlled extraction and dosing of boron from irrigation water are of great interest for applications in agriculture. Thus, the objective of this study was to develop grafting polymers based in N-methyl-D-glucamine (NMDG) from active-chemically PU matrixes with boron retention properties. For that, vinyl-benzyl-N-methyl-D-glucamine (VBNMDG) was synthesized from vinylbenzyl chloride and NMDG. Later, urethanization of VBNMDG was per...

In this work is presented the development of a biofilm with semiconducting properties, derived from cassava starch and plasticizers such as glycerin and glutaraldehyde and doped with lithium perchlorate, which provided the electrical and mechanical properties needed to achieve the desired motion. Electrochemically synthesized polypyrrole (PPy) was used in order to obtain the outer layers to constitute a three-layer actuator (PPy / biofilm / PPy) able to react to electrical stimulus and operate in air. Differents recurrent potentials were administered to the device generating the oxidation and reduction processes in the PPy, easing the movement of the actuator as a whole. In order to describe some of its properties, the actuator was characterized by electrochemical impedance spectroscopy and cyclic voltammetry. Furthermore, a study of the trilayer muscle deflection angle was performed, co...