Baseline wander (BW) is a common low frequency artifact in electrocardiogram (ECG) signals. The prime cause from which BW arises is the patient’s breathing and movement. To facilitate reliable visual interpretation of the ECG and to discern particular patterns in the ECG signal, BW needs to be removed. In this paper, a novel BW removal method is presented. The hypothesis is based on the observation that ECG signal variation covaries with its BW. As such, the P, Q, R, S, and T peaks will follow the baseline drift. On this basis, the following proposition is true: a reliable approximation of the baseline drift can be obtained from the shape derived from the interpolation of one form of the ECG signal peak (peak envelope). The simulation was performed by adding artificial BW to ECG signal recordings. The signal-to-noise ratio, mean squared error, and improvement factor criteria were used to numerically evaluate the performance of the proposed approach. The technique was compared to that of the Hilbert vibration decomposition method, an empirical-mode decomposition technique and mathematical morphology. The results of the simulation indicate that the proposed technique is most effective in situations where there is a considerable distortion in the baseline wandering.

This paper was made in the region of M’daourouch-Dréa which is part of the high plains of northeastern Algeria, located southwest of the Souk-ahras Wilaya in eastern Algeria. It is a plain with agricultural vocation which requires for its development more water. Knowing that the rainfall is low (465mm/year) and not enough to meet the needs of farmers, the use of groundwater then becomes the only alternative to fill this lack of resources. Among the aquifers identified in this region is that contained in fissured limestones of lower Maestrichian age. In order to satisfy farmers and citizens in water it is necessary to have a good characterization of this aquifer. The objective of this paper is to improve the knowledge on the morphology and the extension of this aquifer and to locate its roof in space to help operators choose areas favorable to exploitation, so direct them to the nearest areas of the surface thus minimizing the cost of the drilling operation. To achieve this goal, we have exploited by exploiting several tools (geological map, logs of boreholes and geophysics survey), whose combination gave an idea on the geometry of the aquifer as well as the depth of its roof in different regions of the plain and shows by the occasion, the affectation of these limestones by several tectonic accidents generating thus a structure in collapsed blocks from where the very variable depth of the roof of these limestones of a place of the plain to other.

This paper was made in the region of M’daourouch-Dréa which is part of the high plains of northeastern Algeria, located southwest of the Souk-ahras Wilaya in eastern Algeria. It is a plain with agricultural vocation which requires for its development more water. Knowing that the rainfall is low (465mm/year) and not enough to meet the needs of farmers, the use of groundwater then becomes the only alternative to fill this lack of resources. Among the aquifers identified in this region is that contained in fissured limestones of lower Maestrichian age. In order to satisfy farmers and citizens in water it is necessary to have a good characterization of this aquifer. The objective of this paper is to improve the knowledge on the morphology and the extension of this aquifer and to locate its roof in space to help operators choose areas favorable to exploitation, so direct them to the nearest areas of the surface thus minimizing the cost of the drilling operation. To achieve this goal, we have exploited by exploiting several tools (geological map, logs of boreholes and geophysics survey), whose combination gave an idea on the geometry of the aquifer as well as the depth of its roof in different regions of the plain and shows by the occasion, the affectation of these limestones by several tectonic accidents generating thus a structure in collapsed blocks from where the very variable depth of the roof of these limestones of a place of the plain to other.

In this paper, we propose the modeling of an industrial gas sensor “MQ-9”, where our modeling is based on ANNs “artificial neural networks The gas sensor model, obtained, operated under a dynamic environment and expresses accurately the MQ-9 gas sensor behavior. Accordingly, it takes into account the nonlinearity and the cross sensitivity in gas selectivity, temperature and humidity. This model is implemented into PSPICE “performance simulation program with integrated circuit emphasis” simulator as an electrical circuit in order to prove the similarity of the analytical model output with that of the MQ-9 gas sensor.

Une approche intégrant les données lithologiques, micropaléontologiques et statistiques a été menée sur les échantillons provenant de 4 coupes (El Gaâga, Tighanimine, Menaa et El Kantara) implantés en domaines de plate-forme différenciée. Elle a permis de redéfinir la stratigraphie du transect étudié, d’apporter les informations sur les préférences paléoécologiques de taxons de foraminifères benthiques, planctoniques et d’ostracodes et de décrypter des espèces indicatrices des paléoenvironnements au cours du Crétacé terminal (Campanien-Maastrichtien). Le Campano-Maastrichtien dans les Aurès s’organise en paysages sous forme de doubles collines séparées par une partie médiane en légère dépression. Cette morphologie correspond à la composition généralement tripartite du Campanien-Maastrichtien avec un membre inférieur d’alternance marno-calcaire (membre Haraoua), un membre médian marneux (Membre Akhdar) et un membre supérieur de calcaires massifs (Membre Ncham). La régularité de cette trilogie est modifiée dans l’anticlinal de Dj. El Azereg par des réductions, voire des lacune, affectant visiblement les trois membres. L’inventaire des principaux foraminifères du Crétacé terminal (Campanien-Maastrichtien) de l’Aurès se solde par la détermination de 141 espèces (dont 93 de foraminifères benthiques et 48 de planctoniques). L’application des concepts de la biostratigraphie sur l’ensemble des foraminifères planctoniques permis de distinguer différentes biozones, comprises entre le Campanien inférieur à El Gaâga et El Kantara (biozone à Globotruncanita elevata) et le Maastrichtien (biozone à Contusotruncana contusa). La biostratigraphie ainsi établie se révèle relativement fonctionnelle bien que l’absence de certains marqueurs ne permette pas une zonation très précise.

In this paper, we propose a new numerical method for acoustics microwaves detection of an acoustics microwaves signal during the propagation of acoustics microwaves in a piezoelectric substrate Zinc oxide (ZnO) . We have used Support Vector Machines (SVM) ,the originality of this method is the accurate values that provides .this technic help us to identify undetectable waves that we can not identify with the classical methods; in which we classify all the values of the real part and the imaginary part of the coefficient attenuation with the acoustic velocity in order to build a model from which we note the types of microwaves acoustics( bulk waves or surface waves or leaky waves) . By which we obtain accurate values for each of the coefficient attenuation and acoustic velocity. This study will be very interesting in modeling and realization of acoustics microwaves devices (ultrasound ,Radiating structures , Filter SAW ….) based on the propagation of acoustics microwaves.

The majority of dams in Algeria have some thirty years lifetime, when it comes to tanks intended for drinking water supply or irrigation whose socioeconomic interests justify an unlimited service guarantee. It matters to predict the water retention filling rate and protect these dams from siltation that seems very acute. This paper deals with the problem of siltation in Foum Lgherza dam, in the East Algeria. We attempt to identify siltation behavior according to a detailed analysis based on the comparative approach between results obtained by a projected relationship for the study area, and the measuring results obtained by bathymetric surveys, both of results are very close and determine the aggressiveness of erosive balance and accelerated siltation.

Dans l’étude présentée dans ce travail, on a mené une étude numérique de la convection naturelle dans une enceinte rectangulaire verticale simulant un thermosiphon. La cavité étant remplie de métal liquide. En se basent sur les approximations de Boussinesq et les équations de conservation de masse, de quantité de mouvement et d’énergie, on a développé le modèle mathématique décrivant notre problème. On a mené les simulations numériques en utilisant le code FLUENT qui se base sur la méthode des volumes fins. Un premier travail de validation a été réalisé en comparant nos résultats avec ceux d'autres auteurs. Une étude paramétrique de la convection naturelle dans une cavité avec ailette a été également menée.