1,180 research outputs found
On the Conformal Geometry of Transverse Riemann-Lorentz Manifolds
Physical reasons suggested in \cite{Ha-Ha} for the \emph{Quantum Gravity
Problem} lead us to study \emph{type-changing metrics} on a manifold. The most
interesting cases are \emph{Transverse Riemann-Lorentz Manifolds}. Here we
study the conformal geometry of such manifolds
Knowledge-based supervision and control of wastewater treatment plant: a real-time implementation
The hardware architecture and the software development of a real-time knowledge-based
distributed control system for the supervision of a wastewater treatment pilot plant are presented. The
operation scheme is based on an A²/O system (anaerobic, anoxic, oxic) and includes organic matter
removal, nitrification/denitrification, and Enhanced Biological Phosphorous Removal (EBPR). The hardware
architecture involves different supervision levels, including two autonomous process computers (plant
control and analysers control) and a PLC. The software architecture includes a Knowledge-Based Expert
System (KBES) as the top control system. The KBES has been developed in G2, an expert system
development environment based on object-oriented structural design. This system is fed with data obtained
from the plant monitoring (in-line, on-line and off-line data) and with actuation data of the lower control levels.
Using this information, the KBES supervises the pilot plant in order to help with fault detection and plant
maintenance, but also modifies setpoints and other variables of the local control level to adapt the system to
the different influent conditions. The overall system has been implemented and validated at pilot scale.Spanish Inter-Ministry Commission of Science and Technology (C.I.C.Y.T.) - BIO94-0679-C02, AMB97-0889-c03-01.Fundação Calouste Gulbenkian (FCG).Generalitat de Catalunya. Consell Interdepartamental de Recerca i Innovació Tecnològica (CIRIT)
Real-time expert control of a pilot WWTP with nitrogen and phosphorus removal
Fundação Calouste Gulbenkian; C.I.R.I.T. (Generalitat de Catalunya)
Knowledge-based supervision and control of WWTP: a real-time implementation
Fundação Calouste Gulbenkian (FCG) - post-doctoral research grant.Generalitat de Catalunya. Consell Interdepartamental de Recerca i Innovació Tecnològica (CIRIT) - predoctoral fellowship
A knowledge-based distributed system for supervision and control of wastewater treatment processes
This paper presents the hardware architecture and the software development of a real-time knowledge-based
distributed control system for the supervision of a wastewater treatment pilot plant with biological removal of
organic matter and nitrogen. A continuous monitoring of plant and controls data is used by an expert system
developed in G2, a development environment based on object-oriented paradigm. A set of rules and
procedures to help fault detection, plant maintenance, and nitrification - denitrification cycle operation was
implemented and validated at pilot scale. The hardware architecture includes different supervision levels,
including two autonomous process computers (plant control and analysers control).Fundação Calouste Gulbenkian (FCG) - postdoctoral
research grant..Generalitat de Catalunya. Consell Interdepartamental de Recerca i Innovació Tecnològica (CIRIT) - predoctoral fellowship
Ecocardiografía: estudio longitudinal, relación con el rendimiento en atletas de elite de mediofondo y fondo
Los objetivos del presente trabajo es el de establecer la relación entre las variables ecocardiográficas y la marca realizada a lo largo del seguimiento de varios años, y el de determinar la relación entre el grado de dilatación y de hipertrofia cardíaca. Se realizó un análisis ecocardiográfico en 12 hombres y 12 mujeres que entrenaron para competir al máximo nivel en pruebas de mediofondo y/o fondo. Cada atleta fue medido al menos durante 4 veces. El estudio ecocardiográfico se realizó para cada atleta una vez cada temporada. La mejor marca realizada por cada atleta en cada una de las temporadas fue registrada El VTD/SC mantiene una estrecha relación con el registro deportivo, encontrándose correlaciones significativas (r > 0,80) en varios deportistas, y coincidiendo el valor más alto registrado muy próximo a la mejor marca obtenida en casi todos los atletas. Nuestros resultados demuestran relación negativa entre la evolución de la hipertrofia (PP y SIV) y la mejora de la velocidad de competición (r > -0,70) en algunos de los atletas
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