Fault identification in distribution lines using intelligent systems and statistical methods

The main objective involved with this paper consists of presenting the results obtained from the application of artificial neural networks and statistical tools in the automatic identification and classification process of faults in electric power distribution systems. The developed techniques to treat the proposed problem have used, in an integrated way, several approaches that can contribute to the successful detection process of faults, aiming that it is carried out in a reliable and safe way. The compilations of the results obtained from practical experiments accomplished in a pilot distribution feeder have demonstrated that the developed techniques provide accurate results, identifying and classifying efficiently the several occurrences of faults observed in the feeder. © 2006 IEEE.

Effectiveness of intraoral suction systems and aspirating tips for evacuation of aluminum oxide particles during use of air-abrasion

Aim: The purpose of this study was to compare the effectiveness of a high-volume evacuation and a conventional intraoral suction system and aspirating tips for capturing aluminum oxide particles during use of an air-abrasion device. Methods: A phantom head was fixed at the dental chair head with secured a metallic device with 5 horizontal shafts, corresponding to operator's clockrelated working positions, and one vertical shaft to simulate the operator's nasal cavity. Petri plates were fixed to the shafts at distances of 20, 40 and 60 cm from the center of the oral cavity of the phantom head to collect the aluminum oxide particles spread over during air abrasion. The dust was aspirated with two types of suction tips used with both suction systems: a conventional saliva ejector and a saliva ejector customized by the adaptation of a 55-mm-diameter funnel. Results: The amount of particles showed that the greatest abrasive particle deposition occurred at a distance of 20 cm from the center of the oral cavity of the phantom head at 9 o'clock operatory position with the conventional saliva ejector attached to high-volume evacuation system. Conclusions: The greatest deposition of aluminum oxide particles occurred at the shortest distance between the operator and the center of the oral cavity, while using the high-volume evacuation system associated to the conventional suction tip.

Quantum entanglement and information: The effect of entropy revisited

In non-extensive statistical mechanics [14], it is a nonsense statement to say that the entropy of a system is extensive (or not), without mentioning a law of composition of its elements. In this theory quantum correlations might be perceived through quantum information process. This article, that is an extension of recent work [4], is a comparative study between the entropies of Von Neumann and of Tsallis, with some implementations of the effect of entropy in quantum entanglement, important as a process for transmission of quantum information. We consider two factorized (Fock number) states, which interact through a beam splitter bilinear Hamiltonian with two entries. This comparison showed us that the entropies of Tsallis and Von Neumann behave differently depending on the reflectance of the beam splitter. © 2011 Academic Publications.

Latin America: financial systems and financing of investment. Diagnostics and proposals

Includes bibliography

Resolution 672(XXXIV): establishment of the Conference on Science, Innovation and Information and Communications Technologies of the Economic Commision for Latin America and the Caribbean

Incluye Bibliografía

Resolution 672(XXXIV) Establishment of the Conference on Science, Innovation and Information and Communications Technologies of the Economic Commission for Latin America and the Caribbean

Spanish version available

Observer-based control design for switched affine systems and applications to DC-DC converters

This paper deals with the problem of establishing a state estimator for switched affine systems. For that matter, a modification on the Luenberger observer is proposed, the switched Luenberger observer, whose idea is to design one output gain matrix for each mode of the original system. The efficiency of the proposed method relies on a simplification on estimation error which is proved always valid, guaranteeing the estimation error to asymptotically converge to zero, for any initial state and switching law. Next, a dynamic output-dependent switching law is formulated. Then, design methodologies using linear matrix inequalities are proposed, which, to the authors's knowledge, have not yet been applied to this problem. Finally, observers for DC-DC converters are designed and simulated as application examples. © 2013 Brazilian Society for Automatics - SBA.

Informe del Seminario Regional sobre Sistemas Ambientales y Estrategias para Ampliar la Frontera Agropecuaria en América Latina = Report of the Regional Seminar on Environmental Systems and Strategies for Extending the Agricultural Frontier in Latin America

Contiene los antecedentes y el resumen de los debates del seminario que tuvo como propósito hacer un aporte a la ejecución del proyecto del mismo nombre cuyo objetivo básico es propiciar metodologías viables que tiendan a disminuir el costo ecológico de las transformaciones y a formar silvoagrosistemas sustentables, y que puedan ser utilizados por los planificadores y encargados de proyectos de desarrollo agrícola y regional en áreas de expansión de frontera agropecuaria.

Planning systems and their enforcement in Latin America

Includes bibliography

Report of the Regional Workshop on Microcomputers in Library and Information Management

Informe del Taller de capacitacion en el uso de computadoras para bibliotecas y administracion de informacion a los bibliotecarios de los puntos focales de la Red Caribena de Informacion Cientifica y Tecnologica (CARSTIN).

The production of statistical data and information in the Caribbean: proposals for increasing efficiency in this sphere

Includes bibliography