This doctoral thesis presents the development of sensorless methods aiming the rotor speed control of asymmetrical two-phase induction motors. Initially, the machine mathematical model is presented. From the machine model, ...

Sustainability is becoming a major driving force in energy policy, leading to the development of different strategies and projects. Many of these strategies are related to the application of novel methodologies for selecting ...

Wireless sensor and actuator networks are expected to grow quickly in size due to the decreasing cost of nodes. For such large scale networks, the geographic routing algorithm is a suitable approach. It finds a route for ...

In face of the increasing development of policies and actions in order to preserve the assets of property of society, occurred during the last years, there is one outstanding item, that has to be mentioned: the notion of ...

The use of agro-industrial by-products with pozzolanic properties has become an alternative in the cement industry because of the increasing consumption of cement, aiming at the rational use and sustainability of the ...

The use of solar energy in buildings, to improve the comfort environmental conditions implies in the reduction of energy consumption. Since this is a clean, renewable and abundant energy, the use of design strategies ...

This work refers to consideration of the effects of material nonlinearity applied to the behavior of reinforced concrete beams subjected to simple bending. The importance of the topic is highlight, as well as several ...

In a country like Brazil, which has a high incidence of solar radiation, the use of solar energy is an alternative that has been researched and used with many advantages. This paper presents the design, construction and ...

The carbonation in concrete is caused by the penetration of environmental carbonic anhydride (CO2) in concrete by diffusion, being considered one of more important structures pathologies. It occurs naturally in concrete ...