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Your search keyword '"S.L.G."' showing total 32 results
Start Over Author "S.L.G." Publisher elsevier bv
32 results on '"S.L.G."'

28. Distributed Architecture for Hyroelectric Plant Monitoring and Control

Author

C. Tedesco, A.L. Bogado Fernandes, N.L. Brooking, Eduardo Lima, Carina Alexandra Salvador Ferreira, S.L.G. Miranda, M. Moszkowicz, and H.G. Andrade

Subjects
Engineering, Identification (information), Control theory, business.industry, Computer Applications, Section (archaeology), Control system, Systems engineering, Process control, Control engineering, Architecture, business, Telecommunications network
Abstract

This paper describes a project of a Supervisory and Control System (SCS) for hydroelectric power plants. The presentation of the project is divided into the following sections: functional and operational specifications (section 2); identification of the subsystems of the SCS (section 3); the architecture of the SCS, focusing the main and local control rooms, the sequence controller and the SCS communication network (section 4); and the implementation guidelines for the SCS, (section 5).

Published
1985

29. Middle atmospheric electrodynamic modification by particle precipitation at the South Atlantic Magnetic Anomaly

Author

Osmar Pinto, S.L.G. Dutra, and Walter D. Gonzalez

Subjects
Atmospheric Science, Atmospheric models, General Engineering, Electron precipitation, Geophysics, Atmospheric sciences, Physics::Geophysics, South Atlantic Anomaly, Latitude, Earth's magnetic field, Physics::Space Physics, General Earth and Planetary Sciences, Precipitation, Atmospheric electricity, Magnetic anomaly, Physics::Atmospheric and Oceanic Physics, Geology, General Environmental Science
Abstract

Evidence for a localized middle atmospheric electrodynamic modification at low latitudes (southern Brazilian coast) of the South Atlantic Magnetic Anomaly (SAMA), in association with enhanced geomagnetic activity, are presented in a unified way combining recent observational efforts and related numerical studies. They involve a distortion effect in the fair weather electric field at balloon altitudes. This effect is attributed to a local intensification of energetic electron precipitation through a related middle atmospheric ionization enhancement and is elucidated by numeric simulation. From the electric field measurements and the numeric simulation, the intensification of precipitation is considered to occur in fairly narrow regions at the observed low L values (around L = 1.13) of the SAMA, with horizontal extensions of the order of a few hundred kilometers. A physical mechanism that could be responsible for this sort of intensification is suggested. Furthermore, a comparison of the phenomenon of middle atmospheric electrodynamic modification at the SAMA with a similar one at auroral latitudes, in response to enhanced solar and geomagnetic activity, is also given.

Published
1987

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