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Modeling and development of a bridgeless PFC Boost rectifier

Abstract: This paper proposes a model of the bridgeless PFC (Power Factor Correction) boost rectifier for control purposes based on an averaged small-signal analysis. From circuital laws, four operation modes are defined and explained, ensuring a relationship of physic

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Lightning activity over large cities located in mountainous tropical zone and its relationship with particulate matter PM10 distribution. Bogotá City Case.

Abstract: This paper presents an analysis on the influence of anthropogenic phenomena over the lightning activity in large cities located in mountainous region of tropical zone, specifically in Bogotá City. Some preliminary results show an increase of lightning activit

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Identification of low frequency oscillation modes in large transmission systems

Abstract: There is a typical dynamical performance associated with every system. Oscillations are phenomena inherent to dynamical systems and the analysis of such phenomena is a fundamental issue for understanding the dynamical behavior of a particular system. Knowledg

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Touchless control module for diagnostic images at the surgery room using the Leap Motion system and 3D Slicer Software

Abstract: During surgical procedures, it is important that the personnel (surgeon, residents, or assistants) interact with the patient avoiding any physical contact with equipment and materials that might have not been appropriately sterilized. This is done in order to

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Test and fabrication of piezoresistive sensors for contact pressure measurement

Abstract: The use of contact pressure sensors has become popular in various engineering disciplines in recent years. They are used in characterization of vehicle tires, bearings, wind tunnels, prosthesis design, ergonomic analysis among other areas. These sensors are f

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Application of Weibull analysis and artificial neural networks to predict the useful life of the vacuum packed soft cheese

Abstract: The objective of this work was to evaluate the capability of artificial neural networks (ANN) to predict shelf life and the acidity on vacuum packed fresh cheese. First, cheese samples, of 200 g per unit, were prepared; then these samples were stored for 2 to

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The impact of IT-enhanced organizational learning on performance: evidence from Chile

Abstract: The link between information technology (IT) and organizational learning has been an important subject of study since the early 1990s. However, it is still not clear whether or not IT-enhanced organizational learning positively influences organizational perfo

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Thermal behavior of alternative materials used as roof and efficiency of the reflective painting on the external face

Abstract: This study was developed in order to compare the thermal behavior of different types of roofs by measuring the External Surface Temperature (EST) and the Internal Surface Temperature (IST) over the days. The experimental design was completely randomized, with

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One-dimensional experimental study of rainfall infiltration into unsaturated soil

Abstract: This paper presents experimental results obtained from tests on unsaturated soil in one-dimensional columns simulating a rainfall infiltration process. Six columns composed of compacted Silty Sand were prepared to study the effects of the initial water conten

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NGL supersonic separator: modeling, improvement, and validation and adjustment of k-epsilon RNG modified for swirl flow turbulence model

Abstract: The processing of natural gas requires the implementation of new technologies in a context of increasing demand around the world. The natural gas liquids (NGL) separation using supersonic devices is a novel and efficient way to reduce volume of installed equi

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