Morfolitología de las terrazas del Ter en Girona

It is a contribution to the study of the terraces of the river Ter along its mid-course in the town of Girona, since that is the last speace where it is still possible to observe four of these terraces with clear characteristics of climatical deposition. Itsmorphological peculiarities are described as well as the morphometrical and lithological parameters of its pebbles. These terraces are compared with others which have been studied in other areas of the regions and conclusions are drawn concerning deposition, source àrea and chronology

Presencia del paleogeno bajo los sedimentos neogénicos de Vilablareix (Girona)

This study makes clear the existence of a paleogenical red basal level (Pontils Fm.) in the Vilablareix àrea, under the mio-pliocenical cover of the Girona plain, enlargening the surface known go far of that level

Las fuentes naturales del término municipal de Sant Feliu de Guíxols (Girona)

The behaviour of 21 natural springs in a granític massif is studied in this survey. Geomorphological features of the zone are described as well as water circulation and rising 25 parametres of each of them are analysed ans conclusions are withdrawn regarding geological conditions of rising, course, chemism and potability

Aportaciones al conocimiento de la geología de Bac Grillera (prepirineo, Girona)

The Bac Grillera nappe (Prepirenean of Girona) shows a stratigraphic section composed of two unconformi ty-bounded units. The lower unit is composed by rethian (marly limestones) and liassic (brechoid marly limestones and limestones). The upper unit (sandstones and marly limestones) belongs to the upper Cretaceous (Campanian)

Cronologia dels travertins de Llorà (Girona)

With the aim of radiocarbon dating Llora travertines, chemical and isotopic data of strearn water and present travertines have been analyzed. The purpose is to determine the radiocarbon activity of present travertines in order to assign an initial radiocarbon activity to the old ones. Applying this methodology we conclude that travertines are from Holocen age around 4.000 years BP

Construcció d'un elèctrode d'ió selectiu amb membrana de PVC i marro de cafè com a ionòfor

Els elèctrodes són instruments d’anàlisi molt emprats per la seva gran eficiència, fàcil utilització, de resposta “in situ” i que ocupen poc espai. Tot i això, existeix una problemàtica actual dels elèctrodes, que és la no comercialització d’elèctrodes per tots els metalls que trobem dissolts en solucions d’interès analític. Per aquest motiu s’estudien possibles substàncies dins la formació de la membrana dels elèctrodes, ionòfors, que reaccionin amb espècies iòniques amb inexistència d’elèctrodes comercials. S’han dut a terme estudis amb residus vegetals com a ionòfors. Algunes dels biomaterials estudiats són la rapa i la iohimbe per a la detecció del Cr(VI) i l’Hg(II). Aquestes han sigut les motivacions que han dut a construir un elèctrode de ió selectiu amb membrana de PVC i marro de cafè com a ionòfor, i seguidament avaluar-ne la seva resposta

Aportaciones al conocimiento del Cretácico del macizo del Montgrí (Girona)

ln this paper we describe a stratigraphic column of the Cretaceous of the Montgrí. This description is based on several partial stratigraphic cross sections as well as on the lithological character of the different levels and their faunal content, specially megafossils

Disseny i construcció d'un motor 3D en temps real per la Gameboy Advance

El projecte desenvolupat ha tractat l’estudi i disseny d’un motor 3D interactiu a la consola Game Boy Advance (GBA). La GBA disposa d’un processador ARM7TDMI a 16’78 Mhz i no disposa de operacions 3D per-hardware, és una consola lenta en comparació les que podem trobar al mercat d’avui en dia. Aquest treball, va partir de la construcció d’un prototipus ray-casting per-columna. Després, vàrem adaptar-lo a una estructura de portals i sectors. Més tard, es va introduir el mapeig de sostre/terra i de paisatges. Per últim, vàrem introduir efectes a la renderització per donar més realisme al recorregut del món, com il·luminació, objectes, etc. Tot i que es va estudiar l’arquitectura d’un motor eficient, no es tenia prou per arribar a tenir un motor interactiu. Una de les tasques més difícils va ser la part de optimització. Per aconseguir-ho s’ha hagut de substituir operacions a temps real costoses a temps de execució, replantejar parts de l’algorisme per fer-lo més eficient, entre altres

El Holoceno medio palustre de la llanura litoral del río Ter (Baix Empordá, Girona)

The paludal deposits presented here belong to a geomorphological unit identified between Palafrugell Corridor and the littoral plains of Ter River (Baix Ter), associated to a carbonate-rich spring system. The sections show a distintic clay level, mixed with black silts, very rich in snail remains. The malacological assemblage contained stillwaters species (Bithynia leachii, Galba truncatula, Pisidium milium, Radix peregra) along with damp species (Monacha cartusiana, Oxyloma elegans, Succinea putris, Succinella oblonga, Vallonia pulchella, Vertigo sp.). Some open-dry species are also present (Cernuella virgata, Eobania vermiculata, Pomatias elegans, Rumina decollata) revailing a mosaic-like landscape. Radiocarbon dates place this level ca. 7.000BPwithin the Holocene sequence of the Baix Ter basin. Colluvial deposits on top of these paludal levels have a typical open-dry malacological assemblage (Cernuella virgata, Cochlicella acuta, Eobania vermiculata, Pomatias elegans, Rumina decollata, Trochoidea elegans) the same assemblage that inhabits the Empordà littoral plains nowadays

Participació de les aigües subterrànies en la gènesi d'ambients palustres continentals: el cas dels prats de Sant Sebastià (Caldes de Malavella, Girona)

The area known as 'prats de Sant Sebastià' is in Caldes de Malavella. It is part of the wetlands located in the south-eastern end of the Selva Basin. Several areas with unusually high conductivity (EC up to 24,500 uS/cm) have been identified in this place. This fact allows highly specialised and comparatively rare botanical species to grow in this area. These saline soils follow a north-south line-up. The geophysical data, obtained with a field conductivemeter (EM 31), show that this superficial line-up continues in the subsoil. In addition to this, the conductivity cartography, made for an electromagnetic exploration depth of 6 meters, shows that the width of the region where these salinity anomalies take place increases in depth. When included in the hidrogeological context of this sector of the Selva Basin, these data bring new elements for the study of the genesis and working of these marshy environments. The model that future research will have to confirm, maintains that the groundwater discharges coming from the underlying hydrogeothermal aquifer are a conditioning factor of the aforementioned phenomenon. This ascending flow of highly mineralised waters (TDS of about 3,500 mg/l) can produce and keep stable the soil salinity

Unitats litològiques d'interès per a la producció d'àrids a l'àrea del curs mitjà del riu Fluvià (la Garrotxa)

Pleistocene and Quaternary sediments adjacent to the medium course of the Fluvià river are a source of aggregate in the Garrotxa. Four lithological units can be used directly, or with a minimal processing as coarse aggregate. They have been mapped in detail at the 1:5.000 escale. The stratigraphic analysis have made possible the four units to be ordered in relation to their suitibility for usage as aggregate. From high to low relative quality they are: the basaltic flow, fluviatile deposits, plio-quaternary conglomerates, and glacis deposits

Avaluació dels recursos d'àrids disponibles en medis fluvials mitjançant tècniques geofisiques. Aplicació a la cubeta de Celrà (Riu Ter, Ne Catalunya)

The depth of the water table and the clay content are determinant factors for the exploitability of natural aggregates, such as the alluvial sands and gravels found on the fluvial domain of the Ter River. In this preliminary study, carried out in the Celri basin, we conclude that these variables can be determined by means of geophysical methods and recornmends the use of such methods in studies of regional character

Oscil.lacions del nivell del mar i sediments associats durant l'Holocè a la Costa Brava Meridional (Girona)

Several marine deposits in the southern Costa Brava shoreline have been studied. They appear at different heights above and below the present sea level. Three groups are defined in relation to their origin: conglomerate levels at the bottom of the cliffs, not-cemented emerged beaches and cemented submerged beaches. The age of the emerged beaches has been accurately determined by means of the ceramic content and radiocarbon dating. Chronological succession of the deposits and their stratigraphic and paleontological characteristics allow to define a sequence of the sea level changes during the latest stages of the versiliane transgression in the studied area

La zona lacustre de Banyoles (Girona, España)

Descripció de la zona lacustre de Banyoles des del punt de vista geològic i hidrogeologic

A mission control system for an autonomous underwater vehicle

The presented work focuses on the theoretical and practical aspects concerning the design and development of a formal method to build a mission control system for autonomous underwater vehicles bringing systematic design principles for the formal description of missions using Petri nets. The proposed methodology compounds Petri net building blocks within it to de_ne a mission plan for which it is proved that formal properties, such as reachability and reusability, hold as long as these same properties are also guaranteed by each Petri net building block. To simplify the de_nition of these Petri net blocks as well as their composition, a high level language called Mission Control Language has been developed. Moreover, a methodology to ensure coordination constraints for teams of multiple robots as well as the de_nition of an interface between the proposed system and an on-board planner able to plan/replan sequences of prede_ned mission plans is included as well. Results of experiments with several real underwater vehicles and simulations involving an autonomous surface craft and an autonomous underwater vehicles are presented to show the system's capabilities.