Browsing by Author "Guesalaga, A."
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- Item3D non-destructive evaluation techniques for wood analysis(2014) Paulina Fernández, M.; Tejos Nunez, Cristian Andres; Rojas, G.; Lillo, I.; Guesalaga, A.; Irarrázaval, P.
- ItemEnergy dispersive X-ray diffraction spectroscopy for rapid estimation of calcite in copper ores(PERGAMON-ELSEVIER SCIENCE LTD, 2009) Escarate, P.; Bailo, D.; Guesalaga, A.; Albertini, V. RossiThis article presents a novel technique for measuring the concentration of calcite in copper ore samples using energy dispersive X-ray diffraction (ED-XRD). The results are compared with ultraviolet fluorescence spectroscopy (UVF) for the same group of samples. This approach substantially shortens the measuring time with respect to the current laboratory procedures from 300 min down to 15 min and 9 min for energy dispersive X-ray diffraction and ultraviolet fluorescence spectroscopy, respectively, while preserving a good accuracy level (RMSE < 0.577).
- ItemFuzzy modelling of pulp density in a mineral grinding plant(IEEE, 1994) Cipriano, Aldo; Ramos, M.; Munoz, C.; Guarini Hermann, Marcelo Walter; Guesalaga, A.This paper describes an identification algorithm of fuzzy models and its application to the modeling of the pulp density in a mineral grinding plant. The parameters of the fuzzy model are estimated using information obtained from a process simulator. The performance of the fuzzy model is only slightly superior to that of a conventional linear model
- ItemMatching radar and satellite images for ship trajectory estimation using the Hausdorff distance(INST ENGINEERING TECHNOLOGY-IET, 2007) Bustos, J. P.; Donoso, F.; Guesalaga, A.; Torres, M.A novel technique to obtain position, velocity and radar biases estimates of a ship is described by matching ship-bome radar images to geo-referenced satellite images. The matching is perfortned through the minimisation of the averaged partial Hausdorff distances between data points in each image. The minimisation rapidly yields robust geographical latitude and longitude position measurements, as well as ship heading and radar biases. The accuracy of the measurements is improved by feeding them into a Kalman filter that also allows estimates of the ship's velocity to be obtained. The method provides an alternative effective position sensor for GPS denied environments, which may also be employed for automatic radar calibration of bearing and range biases or for indoor autonomous mobile robot navigation.
- ItemMobile robot localization using the Hausdorff distance(CAMBRIDGE UNIV PRESS, 2008) Donoso Aguirre, F.; Bustos Salas, J. P.; Torres Torriti, M.; Guesalaga, A.This paper presents a novel method for localization of mobile robots in structured environments. The estimation of the position and orientation of the robot relies on the minimisation of the partial Hausdorff distance between ladar range measurements and a floor plan image of the building. The approach is employed in combination with an extended Kalman filter to obtain accurate estimates of the robot's position, heading and velocity. Good estimates of these variables were obtained during tests performed using a differential drive robot, thus demonstrating that the approach provides an accurate, reliable and computationally feasible alternative for indoor robot localization and autonomous navigation.
- ItemRapid measurement of calcite concentration in copper ore using fluorescence spectroscopy(PERGAMON-ELSEVIER SCIENCE LTD, 2006) Escarate, P.; Guesalaga, A.; Otero, A.This work presents the development of a rapid technique for measuring the concentration of calcite in oxidized copper ore. The instrument is based on fluorescence spectroscopy in the visible and infrared range and is excited with a UV-LW lamp. The measurement takes substantially shorter times than standard procedures.