Objective:To identify obstacles and errors that manifest students of the National University of Apurimac –Micaela Bastidasregarding the use of different representations of the function concept. Method:Descriptive study with non-experimental design of simple descriptive type. The collection of information was done through a questionnaire composed of 9 open questions, a sample of 99 students from different careers of the University. Results:Students prevail with the conception of function as an equation. There is a better performance when they work with an algebraic expression that can be evaluated; when they are working in other forms of representation show difficulties to carry out coordination and conversions. Conclusion:It was identified the obstacle of epistemological and cognitive type related to the consideration that a function must be written by a single algebraic expression; an...

This research presents the results of the application of a didactic engineering, designed with the aim of improving learning the concept of function in students of the National University of Apurimac Micaela Bastidas. For engineering design took as reference the Theory of Didactic Situations proposed by G. Brosseau and the Theory of Semiotics Representation Records posed by R. Duval. They conducted a cognitive analysis of the conceptions of students regarding the concept of function, a training analysis on how this concept was in the curricula and textbooks, and an epistemological analysis to identify how the concept was to evolve into a more elaborate definition. The above analysis allowed the identification of significant variables and evaluate the design of six teaching situations were worked with students. The experimental process was carried out with the participation of students of...

This study developed and validated a method of analysis by UHPL-DAD to detect and quantify Ivermectin (IVM) residues in wastewater. The implementation of this method consisted of a robust and efficient method, where the retention time for this residue was 3.1 min. However, the parameters considered in the validation process of the analytical method were: selectivity, linearity, detection limit, quantification limit and recovery percentage; the method is selective, the correlation coefficient is R2 ≥ 0.99, it presents a detection limit (LD) of 0.003 µg L-1, a quantification limit (LQ) of 0.01 µg L-1, and a recovery percentage of 90% (with fortification of 0.1 µg L-1).