Papers by Ricardo G-Aguilar
Journal of Chemical Technology and Biotechnology, May 1, 1998
Pet Sci Technol, 2004
Design of regulative control laws for stabilization of regenerator temperature in adiabatic Fluid... more Design of regulative control laws for stabilization of regenerator temperature in adiabatic Fluid Catalytic Cracking Units is performed. This is achieved despite the fact that kinetic terms and heat generation are, commonly, unknown. This article presents a control law that makes use of on-line discrete measurements of temperature to estimate the heat of reaction, obtained from a neural-estimation algorithm. The controller design is similar to discrete PID controllers. Some new tuning rules are given in terms of closed loop and measured characteristic times. In order to obtain the simplest neural network and the minimum number of parameters to be adjusted, only one perceptron is used. Moreover, the resulting control law has physical meaning and can be interpreted as a standard PID controller with time varying gain. Performance of the neural-estimation technique is analyzed under closed-loop behavior using numerical simulations considering disturbances to the process and set point changes. The performance obtained when using this new control is compared with the one obtained by using a PID controller tuned following the IMC rules.
La monografía del Sur de Almería-Seco de los Olivos se enmarca en una serie de 10 publicaciones e... more La monografía del Sur de Almería-Seco de los Olivos se enmarca en una serie de 10 publicaciones en las que se detallan los resultados de la investigación de las áreas de estudio del proyecto LIFE+ INDEMARES.
Geological features like seamounts and canyons are known to be potential biodiversity hotspots du... more Geological features like seamounts and canyons are known to be potential biodiversity hotspots due to the variety of bathymetric ranges, substrata, habitats and species that they can host. Escarpments share these characteristics and new findings show they can be considered as important biological hotspots. Remotely operated vehicle (ROV) dives between 100 and 1000 m depth carried out in the Emile Baudot Escarpment (Southern Balearic Islands) and the surrounding shelf-break have provided new data on the distribution of deep-sea habitats and species. The most important factor influencing species and habitats' presence is the nature of the substrate and the bathymetry. Although most of the area is heavily covered by sediment, rocky outcrops and overhangs show thanatocenoses of oysters and corals. Coral framework and oyster shells are colonized by other cnidarians, mollusks and sponges like Caryophyllia calveri, Spondylus gussonii or Tretodyctium tubulosum. Some Neopycnodonte zibrow...
El proyecto “Inventario y designación de la Red Natura 2000 en áreas marinas del Estado español” ... more El proyecto “Inventario y designación de la Red Natura 2000 en áreas marinas del Estado español” (INDEMARES: www.indemares.es) tiene como objetivo principal contribuir a la protección y uso sostenible de la biodiversidad en los mares españoles mediante la identificación de espacios de valor para la Red Natura 2000. Diez son las zonas objeto de estudio de este ambicioso proyecto, entre las cuales se encuentra el Cañón de Avilés. La cabecera del Cañón de Avilés se localiza muy próxima a la costa (7 millas) con profundidades mínimas de 140 m sobre la plataforma y alcanzando los 4750 m de la base del talud. Poco se conoce hasta la fecha de este gigantesco accidente, en el cual sin embargo se sabe que se localizan hábitats esenciales (EFH) para los reproductores de importantes especies de interés comercial, como la merluza y el rape, que soportan las pesquerías en los caladeros situados en la plataforma circundante. Por otro lado, este cañón y sus cercanías son conocidos como lugares de ...
Marine pollution bulletin, Jan 4, 2015
Marine litter has become a worldwide environmental problem, tainting all ocean habitats. The abun... more Marine litter has become a worldwide environmental problem, tainting all ocean habitats. The abundance, distribution and composition of litter and its interactions with fauna were evaluated in the upper S. Vicente canyon using video images from 3 remote operated vehicle exploratory dives. Litter was present in all dives and the abundance was as high as 3.31 items100m(-1). Mean abundance of litter over rock bottom was higher than on soft substrate. Mean litter abundance was slightly higher than reported for other canyons on the Portuguese margin, but lower in comparison to more urbanized coastal areas of the world. Lost fishing gear was the prevalent type of litter, indicating that the majority of litter originates from maritime sources, mainly fishing activity. Physical contact with sessile fauna and entanglement of specimens were the major impacts of lost fishing gear. Based on the importance of this region for the local fishermen, litter abundance is expected to increase.
Rev Med Caja Seguro Soc, May 1, 1995
Revista Medica De Panama, Oct 14, 2014
Proceedings of the 2001 IEEE International Conference on Control Applications (CCA'01) (Cat. No.01CH37204), 2001
Journal of the Marine Biological Association of the United Kingdom, 2014
Marine Ecology, 2014
ABSTRACT Marine cave communities have been a continued source of ecological surprises, among othe... more ABSTRACT Marine cave communities have been a continued source of ecological surprises, among other things because of their close ecological and evolutionary ties with the deep sea. The discovery of cladorhizid sponges, the deepest occurring poriferan family, in shallow Mediterranean caves in the 1990s was one such surprise, leading to the generally accepted hypothesis that the whole family was carnivorous, an unprecedented feeding mode for sponges. The recent observation of the cave species Asbestopluma hypogea in the Mediterranean bathyal, confirmed the view that some shallow caves can occasionally shelter otherwise deep-dwelling species. Here we present new distribution data of A. hypogea, from deep Mediterranean locations, and for the first time from Atlantic locations. Among the new Atlantic records, the most surprising ones are located in three different geographic areas (Ria de Arousa, Groix Island and Cherbourg) of the NW European coasts, from the Iberian Peninsula to the English Channel, where A. hypogea reaches SCUBA depths (5–50 m), while not sheltered in marine caves. The carnivorous sponge however reaches its shallowest occurrence (5 m), in a small cave at Groix Island. The ecological significance of these discoveries, particularly the very patchy distribution and peculiar dynamics, are noteworthy, and the shallow occurrence of A. hypogea, together with other deep-water or uncommon species, constitute unique assemblages that must be considered in conservation plans.
Process Biochemistry, 2001
An estimation algorithm related to the kinetics terms of the main uncertainties present in a cont... more An estimation algorithm related to the kinetics terms of the main uncertainties present in a continuous stirred tank bioreactor, is developed. This algorithm is based on a proportional–integral reduced order uncertainty observer. With the estimate generated of the uncertain term, an input–output linearizing feedback control is designed which provides robust regulation model uncertainties, noisy measurements and sustained disturbances. This control
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Papers by Ricardo G-Aguilar