Abdelfatah Tahiri

Comparative review of the Variscan granitoids of Morocco and Iberia: proposal of a broad zonation

The present paper takes the Variscan granitoids of Morocco as the starting point for the discussion of broad correlations of magmatism along the Variscan orogenic belt. Remarkable differences stand out between the Western Moroccan Meseta (peraluminous granites) and the Eastern Moroccan Meseta (potassic to shoshonitic, calc-alkaline granitoids). In Iberia, the Variscan magmatism can be arranged into distinctive zones too, which have been compared with those in Morocco. Although two of these zones mimic the I-type and S-type subduction paired belts, the intrusion of the granitoids was mostly late-collisional. Calc-alkaline, metaluminous (I-type) potassic granitoids of the southern zone may reflect a source of enriched mantle (such an enrichment taking place during Devonian Variscan subduction or latest Precambrian subduction) and different degrees of crustal contamination. Considerable volumes of peraluminous S-type granites in the central magmatic zone reflect a widespread melting of fertile levels in the crust. The third magmatic zone is characterized by the precocity (Middle Devonian to Early Carboniferous) of its magmatism with respect to the two other zones and the abundance of basic rocks. For the latter zone, we suggest that most of the magmas were generated in the context of an intra-orogenic continental rifting, while others may be subduction-related.

LES ROCHES MAGMATIQUES ET PYROCLASTIQUES DU CONGLOMERAT STRUNIEN DE L'OUED TIFLET (MESETA NORD OCCIDENTALE MAROCAINE): PETROGRAPHIE, GEOCHIMIE ET PROVENANCE

The field of Depth of Anaesthesia (DOA) is a very challenging area for neuro-fuzzy control since direct measurements are unavailable. During anaesthesia, the blood pressures (BP), the mean arterial blood pressure (MAP) and the heart rate (HR) are monitored to maintain hemodynamic stability and to assess the level of consciousness. The purpose of this study is to find the best input-output definitions in the Adaptive-Network-based Fuzzy Inference System (ANFIS) to control the Sevoflurane dose to patient under the general anaesthesia with the classical MAP and HR parameters. The best models have been found among many possible input combinations. This study helps to provide an alternate control for the dose of Sevoflurane which is widely used as an anaesthetic agent. The models have been trained and validated by clinical data. The results show that the patients can be modelled by ANFIS if sufficient HR and MAP data are provided. Furthermore, the model performance could be increased if the patients are grouped as adults and children. The performance (up to 0.99) in this study is comparable to recent works in similar subject which detect DOA by Electroencephalograms (EEG).