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1
tesis de grado
Publicado 2019
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En el presente proyecto se describen los problemas de sujetar y colocar componentes electrónicos SMD en tarjetas PCB cuando se aplica el método convencional. Los componentes SMD pueden estar mal soldados y averiados por consiguiente la PCB es de baja calidad. Los componentes de montaje superficial no deben de ser tocados con la mano, porque ésta podría generar descargas eléctricas al circuito integrado. El tiempo en colocar los componentes SMD de forma correcta en su posición de referencia depende del número de componentes y el tipo de empaquetadura a colocar en la PCB. El presente trabajo se plantea dos propuestas de diseño mecánico. Se diseñó el módulo de succión neumática en el programa SolidWorks y realizó pruebas de estabilidad con función escalón y entradas de posiciones para analizar el comportamiento del en lazo abierto y en lazo cerrado. El primer modelo está d...
2
artículo
Publicado 2012
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Se investigó a nivel de laboratorio las variables de operación (concentración de reactivos, pH y potencial de oxidación) del proceso de lixiviación de piritas auríferas procedentes de río Tablachaca (Ancash Perú) con Tiourea (TU) seguido de electro-deposición de oro. El estudio experimental, se desarrolló en tres etapas: Oxidación de Tiourea, Lixiviación de oro y Electro-deposición de oro. Como una alternativa a los agentes químicos, la oxidación de TU se realizó vía electrólisis para producir Disulfuro Formamidina (FDS), el cual, sirve como oxidante en la disolución de oro. El grado de conversión óptima de tiourea a disulfuro formamidina se obtiene en 2,5 h aplicando una FEM de 4,5 V con un pH igual 1,5. Los compartimientos anódico y catódico del reactor electroquímico fueron separados por una membrana aniónica con la finalidad de eliminar reacciones indeseables...
3
artículo
Publicado 2012
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The research in the laboratory was made operating variables (reactant concentration, pH and oxidation potential) of pyrite leaching gold from river Tablachaca (Ancash Peru) with thiourea (TU) followed by electro-deposition of gold. The experimental study was conducted in three stages: Oxidation of thiourea leaching of gold and gold electroplating. As an alternative to chemical agents, TU oxidation via electrolysis was conducted to obtain formamidine disulphide (FDS), which serves as an oxidizer in the dissolution of gold. The optimum degree of conversion of formamidine disulfide thiourea in 2.5 h was obtained by applying a FEM of 4.5 V with a pH of 1.5. The anodic and cathodic compartments of the electrochemical reactor were separated by an anion membrane with the purpose of eliminating undesired reactions at the cathode. Prior to the leaching step, the mineral was washed with sul...
4
artículo
Publicado 2012
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The research in the laboratory was made operating variables (reactant concentration, pH and oxidation potential) of pyrite leaching gold from river Tablachaca (Ancash Peru) with thiourea (TU) followed by electro-deposition of gold. The experimental study was conducted in three stages: Oxidation of thiourea leaching of gold and gold electroplating. As an alternative to chemical agents, TU oxidation via electrolysis was conducted to obtain formamidine disulphide (FDS), which serves as an oxidizer in the dissolution of gold. The optimum degree of conversion of formamidine disulfide thiourea in 2.5 h was obtained by applying a FEM of 4.5 V with a pH of 1.5. The anodic and cathodic compartments of the electrochemical reactor were separated by an anion membrane with the purpose of eliminating undesired reactions at the cathode. Prior to the leaching step, the mineral was washed with sul...
5
artículo
Publicado 2019
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In the present study we propose the use of graphitic felt anodes coated with iron to control electrochemically the amount of coagulating agent, in the form of the Fe(II)/Fe(III) pair, which is introduced into the aqueous phase. At the same time, this pair helps catalyze the electro-Fenton process while H2O2 is generated cathodically. Here are reported the conditions to modify cathodically the graphite felt surface, as well as its characterization by SEM-EDS microscopy and X-ray diffraction (XRD). This material is then used as an anode that acts as a source for the Fe(II)/Fe(III) pair, while an unmodified felt acts as a H2O2 generator. Under these conditions, by means of permanganometry, the H2O2 content produced in function of time is quantified. Finally, the graphite felt was applied in the electrochemical treatment of synthetic emulsions of palmitic acid stabilized in aqueous medium, a...
6
tesis de grado
Publicado 2022
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The present investigation carried out was carried out on an automatic machine built of stainless steel AISI 304 that is a filler of liquids in PET-type containers in 325 and 500 ml presentations and that is located in the Pilot Plant of the Faculty of Food Industries of the National University of the Peruvian Amazon. For the execution of the same, the original PLC (programmable logic controller) was recovered (unconfigured due to lack of use) and an alternative control system was implemented, both systems are in charge of carrying out the filling process of the 325-liter containers. 500 ml articulating all the mechanisms involved, providing the equipment operator with a friendly and easy-to-use environment. The equipment is commanded by a PLC that by means of a count command (timer) is linked with the various electro-pneumatic actuators to infer each one of the necessary functions for th...
