Ingeniero Civil Mecánico / La Biolixiviación de cobre en pilas es un método utilizado actualmente por la industria, siendo de gran interés para minerales sulfurados. La rentabilidad de este proceso depende de diversos factores, especialmente de la temperatura de operación de la pila, ya que los microorganismos utilizados son muy sensibles a su variación teniendo un rango óptimo de operación, en el cual su eficiencia se ve mejorada aumentando la velocidad de extracción del cobre. El objetivo de este trabajo es el estudio del comportamiento térmico de una pila de biolixivación a través de un modelo físico-matemático y simulaciones termo-fluidodinámicas que consideren tanto los efectos ambientales, como la generación de calor al interior de la pila. Se presenta un modelo matemático que considera el estado multifásico del sistema, donde coexisten la fase sólida del material apilado, la líquida del fluido de irrigación y la gaseosa de la aireación, describiendo las principales ecuaciones que intervienen tanto en el transporte de momentum y de energía en medios porosos. Se realizan simulaciones en el software COMSOL Multiphysics para un sistema simplificado que considera un medio saturado en fluido cuyo campo de velocidad es descrito con la Ley de Darcy, además de la transferencia de calor considerando los términos de fuente y los fenómenos de borde. Se observa que la generación de calor volumétrica es el principal factor para mantener altas temperaturas en la pila. La convección interna debido al fluido de irrigación también tiene importancia en la temperatura alcanzada por el medio, al aumentar al doble la tasa de irrigación disminuye la temperatura promedio entre 7,5 [K] y 10,5 [K]. Cubrir la pila atenúa los fenómenos de contorno disminuyendo la evaporación, logrando un aumento en la temperatura promedio de 3,5 [K] en verano y de 5,75 [K] en invierno, lo cual es un aporte moderado. Aumentar la temperatura del fluido de irrigación en 10 [K] presenta un aumento entre 1,5 [K] a 2 [K] en la temperatura promedio de la pila, siendo un aporte despreciable con respecto a los costos que puede involucrar el aumento de la temperatura de irrigación.

The thesis is focused on qualities problems of the cutting kerf rip saw-blade at along grain cutting native wood. The effect of vibrations of circular saw-blades and feed rate of shift of workpiece on the quality of the kerf has being investigated. The basic parameters of evaluation of the surface were mentioned in theoretical part of this thesis. Also, the methods of assessing the quality of the surface of scattered timber are analyzed inside this thesis. There is also described suitability of different measurement methods, which have been used, due to the nature of solid wood. Finally, constructional modifications of scattering discs are characterized here. At practical part of this thesis is compared the quality of surface of wood scattered with using of saw-blades from company of PILANA. Discs with standard profile of tooth and special toothing of shaped keg were used.

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This work deals with the documentation and methods of restoring the water drive saw-mill, which is located in the Mariánské Valley in Brno-Líšen. The purpose of this work is to document and propose a repair methods for presentation and practical use of saw-mill. One of the main requirements for object reconstruction is to preserve its historical value. Historical development will focus on the object as a whole. However, the documentation and repair proposals will focus in detail on the saw-mill. This work will include a drawing attachment of the recommended repair alternative. In addition, elaborated proposal serves to obtain the technical parameters of the saw. The sawmill should serve as a technical and cultural monument for presentation purposes in the future.

The theme of this thesis is design of horizontal band saw and it deals with problems of existing machines on market. Main goal of work is to create effective design and solution of problematic parts, with emphasis on modernization of band saws, which ones processing raw tree trunks.

In this Diploma thesis is general description of company Halama Invest, s.r.o., its management organization, production planning and its technological equipment. Technological drawing of sawmill and timber manufacturing process represent the current state of the production. There are elaborated three possibilities of modernization of sawmill, their advantages and disadvantages, differences among various technological operations. The comparison results of these possibilities is the evaluation based on production efficiency and return of investment. There have been defined recommendations and suitable options in development of the mentioned company in the future.