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This paper presents the results of four electromagnetic compatibility (EMC) tests carried out in the anechoic chamber of Universidad de los Andes (Bogotá, Colombia) on mechanical ventilators manufactured by different Colombian initiatives responding to the COVID-19 emergency. The four tests were carried out in accordance with the IEC 60601-1-2 product standard. The tests were the following: radiated immunity in the 80 MHz to 1000 MHz frequency, according to generic standard IEC 61000-4-3; radiated immunity at specific frequencies of 385 MHz, 450 MHz, 710 MHz, 745 MHz, 780 MHz, 810 MHz, 870 MHz and 930 MHz, in accordance with generic standard IEC 61000-4-3; conducted emissions, in accordance with the CISPR 11 standard; and radiated emissions, in accordance with the CISPR 11 standard. It describes the standards used to carry out the tests, the experimental setup used in each test, the observed results and the mitigation measures required to pass the tests. The results are discussed and necessary measures are suggested to promote the development of electromagnetic compatibility in Colombia. [ABSTRACT FROM AUTHOR]

The control of plagues with chemical products still constitutes a problem in the agriculture in the world, First to the affectation to the environment, Secondly the economic effects are increased when the treatments are not carried out with the required quality; in this situation the spraying machine plays a decisive paper in the application of the chemical products. In the study was used the spraying machine in the treatment of the fruit trees, that use current of air for the transfer of the plaguicida drop toward the tree. In the cultivation of fruit the attack of plagues can produce losses of until 25% of decrease of the yields in the less severe cases. This study consists of determining the relationship between the parameters of the fan and the quality of work of the spraying machine; this knowledge will permit to select the most appropriate spraying machine to use in each case. The work is based on the use of the experimental design 2³ to determine a mathematical model that expresses the relationship of the parameters of the fan and the quality of the spraying machine. The results demonstrate in the model that when increasing the uniformity of air exit speed and the wide of exit difusor of the fan, an increase in the quality work of the spraying machine take place. [ABSTRACT FROM AUTHOR]