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Now showing items 1-20 of 417

Influence of modeling in load flow analysis of three phase distribution systems

Rudnick Van de Wyngard, Hugh; Muñoz Montecinos, Cristián Marcelo (IEEE, 1990)

The authors present a comparison of three phase load flow algorithms for distribution power systems. Reference is made to traditional single-phase load flow methods used in transmission systems and the main three-phase ...
Fuzzy modelling of pulp density in a mineral grinding plant

Cipriano Zamorano, Aldo; Ramos, M.; Munoz, C.; Guarini, M.; Guesalaga, A. (IEEE, 1994)

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 ...
A fuzzy logic based model computes cardiac output from the radial arterial pressure waveform

Urzua Urzua, Jorge; Guarini Hermann, Marcelo Walter; Cipriano Zamorano, Aldo; Matus Acuña, Marcelo Enrique; Lee, J.; Salinas, C.; Olmedo Hidalgo, Juan Carlos; Lema Fuxman, Guillermo; Canessa Be, Roberto Santiago (IEEE, 1994)

An interactive scheme for the development of a fuzzy logic based model has been implemented and applied to build a model that is able to determine cardiac output from radial arterial pressure. It was built using as input ...
A sensor for assessing the quality of the mineral flotation process

Guarini Hermann, Marcelo Walter; Caceres, J.; Guesalaga Meissner, Andrés Rodrigo; Cipriano Zamorano, Aldo; Olmedo Hidalgo, Juan Carlos; Lozano Segura, Hector Andres (IEEE, 1994)

An instrument to assess the quality of the flotation process for mineral concentration in the copper industry has been developed. It is based on computer processing of images of the foam formed at the surface of flotation ...
CNC control of a laser cutting machine

Chiang Sánchez, Luciano Eduardo; Ramos Grez, Jorge (IEEE, 1994)

This article describes the design and construction of a low power laser cutting machine with three degrees of freedom for applications such as wood, textile fabrics and the like. An available 10 Watt laser gun is used to ...
3-D CNC trajectory interpolation using Bresenham's algorithm

Chiang Sánchez, Luciano Eduardo (IEEE, 1994)

This article describes a 3D extension of Bresenham's algorithm and its implementation in the linear trajectory interpolation of CNC paths. The resulting algorithm has been successfully applied to a CNC milling machine that ...
A series active power filter based on a sinusoidal current controlled voltage source inverter

Dixon Rojas, Juan; Venegas Castro, Gustavo Adolfo; Morán, L. (IEEE, 1995)

A series active power filter, working as a sinusoidal current source, in phase with the mains voltage, has been developed and tested. The amplitude of the fundamental current in the series filter is controlled through the ...
ANTICHOLINERGIC THERAPY IN CYSTIC-FIBROSIS PATIENTS

Sánchez Díaz, Ignacio (EDITIONS SCIENTIFIQUES ELSEVIER, 1995)
THE PROCESSES, STRUCTURES, AND OUTCOMES OF CARE IN CARDIAC-SURGERY STUDY PROTOCOL

Shroyer, A. L.; London, M. J.; Villanueva, C. B.; Sethi, G. K.; Marshall Rivera, Guillermo; Moritz, T. E.; Henderson, W. G.; McCarthy, M. J.; Grover, F. L.; Hammermeister, K. E. (LIPPINCOTT-RAVEN PUBL, 1995)
Space and time resolved observations of plasma dynamics in a compressional gas embedded Z-pinch

Soto, L.; Chuaqui, Hernán; Favre Domínguez, Mario Benjamin; Saavedra Sanchez, Renato Alejandro; Wyndham Hodder, Edmund Sydenham; Aliaga-Rossel, R.; Mitchell, I. (IET, 1996)

Recent experiments in a gas embedded compressional Z-pinch are presented. The experiments have been carried out in H2 at 1/3 atm, using a pulse power generator capable of delivering a dI/dt > 1012 A/s. The pinch is initiated ...
Studies of current sheath evolution in a small plasma focus device

Silva, P.; Favre Domínguez, Mario Benjamin; Chuaqui, Hernán; Wyndham Hodder, Edmund Sydenham; Choi, P. (IET, 1996)

We present preliminary time and space resolved studies of current sheath formation in Plasma Focus discharges, using a novel array of non invasive magnetic field probes. The experiments are performed in a Mather type plasma ...
Time resolved observations of plasma evolution in the hollow cathode region of a transient hollow discharge

Favre Domínguez, Mario Benjamin; Zambra Yañez, Marcelo Cristian; Moreno Martinez, Jose Alberto; Chuaqui, F.; Wyndham Hodder, Edmund Sydenham; Choi, P. (1996)

It is known that in a transient hollow cathode discharge (THCD), the formation of a moving virtual anode in the A-K space is causally linked to the emission of high energy electron beams originated in the hollow cathode ...
Studies on pulsed hollow cathode capillary discharges

Choi, P.; Dumitrescu-Zoita, C.; Larour, J.; Rous, J.; Favre Domínguez, Mario Benjamin; Zambra, M.; Moreno Martinez, José Alberto; Chuaqui, Hernán; Wyndham Hodder, Edmund Sydenham; Wong, C. S. (IET, 1996)

We present preliminary results on radiation characteristics of pulsed hollow cathode capillary discharges. The device combines the on axis electron beam assisted ionization capabilities of the transient hollow cathode ...
Characteristics of a small plasma focus device

Favre Domínguez, Mario Benjamin; Silva, P.; Chuaqui, Hernán; Wyndham Hodder, Edmund Sydenham; Choi, P.; Dumitrescu-Zoita, C. (IET, 1996)

We report on experimental observations in PFP-I, a small 3.8 kJ plasma focus, which is operated in Hydrogen-Argon mixtures to investigate the effect of parameter modifications on the overall performance of the device. An ...
Electrical characteristics of a small plasma focus device

Choi, P.; Favre Domínguez, Mario Benjamin; Silva, P.; Chuaqui, Hernán; Wyndham Hodder, Edmund Sydenham (IET, 1996)

Efficient plasma focus operation relies on uniform initial breakdown across the insulator surface. In this paper, we discuss basic plasma focus electric circuit, in order to highlight circuit modifications that produce ...
CED: a new method for high speed stepping motor driving

Vadell Rivera, Jaime Ernesto; Lira Canguilhem, Ignacio; Dixon Rojas, Juan (IEEE, 1997)

Stepper motors are indexing devices widely used today in microcomputer controlled machines because of their low cost, simplicity, accuracy and repeatability. Even though their speed is presently adequate for many purposes, ...
DC link fuzzy control for an active power filter, sensing the line current only

Dixon Rojas, Juan, 1948-; Contardo Guevara, Jaime; L. Moran (IEEE, 1997)

A different approach for controlling a shunt active power filter is presented. The DC link is controlled with fuzzy logic, and the current generated for the filter to compensate harmonics and power factor is not sensed. ...
Specifying active databases in the situation calculus

Bertossi Duran, Leopoldo; Pinto Bustamante, Javier Andres; Valdivia Pinto, Ricardo Elías (IEEE, 1998)

The paper provides a predicate logic based semantics for active rules in active databases. Previous work has been done to provide the semantics of execution of active rules. In part, this work has been directed towards ...
Query evaluation in almost consistent databases using residues

Arenas Saavedra, Marcelo Alejandro; Bertossi Duran, Leopoldo; Chomicki, Jan (IEEE, 1998)

The authors consider the problem of logical characterization of the notion of correct answers in a relational database that may violate given integrity constraints. This notion is captured in terms of the possible repaired ...
Ion beam measurements in a small plasma focus operating in hydrogen/gas mixtures

Silva, P.; Favre Domínguez, Mario; Choi, P.; Dumitrescu-Zoita, C.; Chuaqui, Hernán; Wyndham Hodder, Edmund Sydenham (IEEE, 1998)

Dense transient plasmas of high energy density, can be easily produced in a plasma focus device, on a cost effective basis. High energy ion beam emission is one, among several others, of the very interesting transient ...

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