Anciennes Publications Faculté des Sciences et de la Technologie
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Item Mission CubeSat pour l’etude du comportement des SiPMs dans l’espace(2020) Yasmina, Mohammed BelkacemItem Logique Combinatoire et Séquentielle(2015) Choukria, AYACHE (née SAYAH); Shahra, SOLTANEItem Développement d’un procédé SDR hybride pour différentes générations de Télécommunications mobiles(2019) Réda, YAGOUBThe advance made in digital technology has introduced the opportunities to replace analog parts of the radio communication systems with digital components as FPGA and SoC or even Asics. All improvements provide the opportunity to build reconfigurable radio platform with only software constraints. Based on this context the software-defined radio (SDR) appeared. This emergent technology makes it possible to implement wide range of signal processing algorithms used in the digital domain. Indeed, this will allows greater configuration, flexibility and reduces considerably the costs of developing and deploying radio systems. Moreover, it will allow rapid changing and free of charge to higher or different radio communication standards. This work is divided into two main parts: The first part is dedicated to the SDR technology, the concept, the different architectures and the low cost platforms available allowing researchers to implement SDR solutions. A detailed study of the RTL-SDR platform is presented. In the second part, we are interested in the implementation of different applications using the RTL-SDR Dongle. First, we presented approaches used for the demodulation of FM signals, spectral analysis and spectral activity detection. Finally, an embedded positioning application combining the RTL-SDR platform and the Raspberry Pi version 3 based on GSM signals is presented.Item Cours Communications Analogiques(2015) Souheyla, Belhamiani (née Ferouani)Item Contribution à la Conception et à la Réalisation des Configurations Compactes des Filtres SIW DGS pour les Applications de Télécommunications Spatiales(2020) NOURA, Ahmedthe substrate integrated Waveguide (GIS in English SIW) is a very promising technique because it allows the use of the advantages of waveguides and planar transmission lines. This technology which significantly reduces production costs. The waveguide integrated into the substrate is a guided wave structure which has advantages with a high quality factor Q and excellent line-to-line insulation. The GIS technique has been widely used in the construction of passive components, such as couplers, dividers, filters, and phase shifters. This thesis effectively presents original unconventional filter structures made on the basis of SIW cavities (SubstrateIntegratedWaveguide) combined with the new mass plane technique known as Defective Soil Structure (DGS) which can be used for space applications in higher frequency. The filters designed have multifunctional characteristics such as multiple operating frequency bands, such as the S, C, X and Ku band.Item Transformation Intégrale Dans Les Espaces Lp(2017) Kheira, MekhalfiItem Sécurité Informatique Polycopié de Cours & Exercices Corrigés(2016) Zohra, SlimaneItem Introduction `a la topologie(2017) AMIN, BENAISSA CHERIFItem COURS D’ANALYSE DE PREMIÈRE ANNÉE(2018) ABDERRAHMANE, BENIANIItem Thermodynamique Classique(2015) Meriem, HARMELItem manual d'intervention interne et de securitè(2015) Karima, Benyahia; Sidi Mohamed El Habib, MedjahdiItem FONDAMENTAUX DE LA CHIMIE DES SOLUTIONS(2015) Hamida, SahnouniaItem CuCO3–CuO nanocomposite as a novel and environmentally friendly catalyst for triazole synthesis(2015) Halima, Hadj Mokhtar; Bouhadjar, Boukoussa; Rachida, Hamacha; Abdelkader, Bengueddach; Douniazad, El AbedItem Cours Ondes et vibrations (physique3)(2014) S, HebriItem Travaux pratiques De Mécanique des fluides (ESP &ESL)(2018) Bouabdellah, GUEMOUItem Traitement des eaux résiduaires d’industrie de textile par électrocoagulation en réacteur continu(2019) Mohammed, TIAIBAElectrocoagulation (EC) is an effective treatment for highly polluted industrial wastewater. It has been used successfully for the treatment of various industrial effluents including effluents issues from food industries, tanneries wastewater, water containing metals or heavy metals, wastewater contained soluble oil issued from mechanical workshop, polymerization manufactures, and textiles industries. The main objective of this study was to investigate the effects of the operating parameters, such as initial pH, initial concentration (C0), residence time (τ), current density (j), inlet flow rate (Q), direct/ alternating current (DC/AC) and electrode connection systems on the removal of a red nylosan dye (Acid Red 336) by EC process using aluminum electrode in a continuous electrochemical reactor. The optimized parameters will be applied to the treatment of a real textile effluent. Our results suggest an opportunity for the application of continuous EC process to remove color and turbidity from wastewater. For example, A rate of abatement between 87 % and 96 % for color and turbidity was observed for the direct current, when the initial concentration of the dye C0 was ranged from 100 mg/L to 1000 mg/L, current density j = 300 A/m², conductivity κ = 2.5 mS/cm, inlet flow rate Q = 15 L/h and 26 L/h, treatment time t = 30 min and initial pH ranged from 3.46 to 9. The specific electrical energy consumption was 9.5 kWh per kilogramme of removed dye for direct current and monopolar connection. The recirculation of the wastewater increased considerably the elimination of the color and the turbidity for the two modes of connection (MP and BP), but for (MP-P) connection, the effect was not significant. For the influence of electrodes connection modes, the results showed that bipolar connection is slightly more effective compared to monopolar connection (MP) in terms of abatement of the color and turbidity. But in terms of consumption of energy, the bipolar mode (BP) consumes more energy than the monopolar mode (20 kWh per kilogramme of removed dye)Item Etude des techniques et aménagements traditionnels de conservation de l’eau et du sol dans les montagnes du nord algérien(2019) Omar, DJOUKBALAWater erosion is the main source of soil degradation in arid and semi-arid areas, particularly in the Mediterranean region. This phenomenon, which affects the soil and water resources of Algerian basins, is linked to many interacting factors. The objective of this study is to analyze and study the phenomenon of water erosion and sediment transport in the semi-arid and Mediterranean context, to conduct this study, we have chosen a typical semi-arid watershed case of wadi El-Ham with an area of 5594 km² and a perimeter of 492 km, it is located north-west of the large basin of Hodna basin (26 000 km²),. This Hodna basin is characterized by both a semi-arid and Mediterranean climatical context, because it is located less than 150 km from the Mediterranean. The availability and reliability of rainfall and hydrometric data were among the criteria for choosing this study area, the basin is equipped with 12 rainfall stations and one gauging station Rocad-sud located at the outlet. of the watershed The use of modern tools and technologies (GIS and remote sensing) has allowed the generation and integration of multiples maps of the different factors of the Universal Soil Loss Equation (RUSLE) to obtain erosion distribution maps. For wadi Elham watershed case, the resulting map shows an average specific degradation of 5.7 (t/ha/year) in the entire watershed. This result is compared to the suspended sediments measured at the Rocade-Sud gauging station located at the outlet watershed. These data consist of 1293 instantaneous measurements of water flow and suspended sediment concentration recorded over 21 years. Through this comparison, the used approach of RUSLE GIS estimates the soil loss at wadi ElHam in the Hodna region of Algeria with a mean relative error of 7.5%. The study showed that water erosion plays an important role in the degradation of natural resources (water and soil), despite the investments made by the Algerian authority to protect these resources. This phenomenon continues and even accelerates; it is still causing enormous damage that is above the tolerable threshold. Part of this thesis work is devoted to the study and analysis of water and soil conservation techniques to complement those carried out in several areas (Wadi El Ham "Msila", Oulhassa "Ain Temouchent "Honaine " Tlemcen "). Water and soil conservation and management strategies are of primary interest, which has enabled us to contribute to the identification of the different techniques for their conservation, and to highlight their effectiveness and relevance . This evaluation demonstrated the positive role of these techniques in water control, the preservation of natural environments and their adaptation to the difficult conditions of dry and semi-arid areas.Item Utilisation Des Méthodes ANN Pour La Prédiction des parametres de gonflements des argiles(2020) Fatima Zohra, MEROUANELe phénomène de gonflement est l’un des problèmes géotechniques complexes dont l’ingénieur est souvent confronté, et sa quantification est essentielle pour le dimensionnement des ouvrages. Divers procédés peuvent être appliqués à l'identification des sols gonflants. Certains, tels que l'identification minéralogique et les mesures directes de gonflement, sont plus ou moins longs et nécessitent un appareillage bien spécifique. Or il existe d’autres méthodes, qui offrent l'avantage d'être relativement rapides et beaucoup moins coûteux : ils sont basés sur des paramètres de mécanique des sols. Utilisant ces paramètres, plusieurs auteurs ont introduit des modèles de prédiction du gonflement des sols exprimés en majorité sous forme de classifications et formules empiriques. Ce travail concerne dans une première partie l’identification et la classification du potentiel de gonflement de deux argiles situées au nord-ouest de l’Algérie. Suivie d’une analyse statistique effectuée dans le but de tester la fiabilité des observations pour l’estimation de la pression et l’amplitude de gonflement utilisant une régression linéaire multiple. Une deuxième partie est consacrée au développement d’une méthode de prévision par les réseaux de neurones artificiels permettant l’estimation des paramètres de gonflement (pression et amplitude) en minimisant l’écart entre les mesures expérimentales et les résultats numériques. La modélisation par les réseaux de neurones artificiels présente un grand intérêt dans le domaine de la prévision. L'application de quatre réseaux permet d'obtenir de bonnes prévisions des paramètres de gonflement. Dans la dernière partie, l’utilisation des prévisions de gonflement obtenues par RNA sont utilisées pour construire des cartes préventives des régions étudiéesItem Etude de la stabilité des plaques composites épaisses en utilisant des théories de déformation d’ordre élevé(2018) Fouad, BOURADADans le présent travail, on présente une analyse du flambement des plaques isotrope, orthotrope et fonctionnellement gradué en proposant une nouvelle théorie raffinée des plaques a quatre variables. Contrairement au théorie existante de déformation de cisaillement d’ordre élevée (HSDT) et la théorie de déformation de cisaillement du premier ordre (FSDT), le modèle proposé utilise un nouveau champ de déplacement et par l’introduction des termes d’intégrale indéterminé on obtient que quatre inconnues. Les équations d’équilibre pour l’analyse de flambement sont déterminées en utilisant le principe des travaux virtuels. La solution analytique pour une plaque rectangulaire simplement appuie soumise à un chargement axiale a été déterminé par l’intermédiaire de la méthode de Navier. Des résultats numériques sont présentés en utilisant le modèle proposé et des comparaisons avec la CPT, FSDT, HSDT et les solutions exactes a été effectué. Il a été conclu que la théorie développée à quatre variables et qui n’utilise pas de coefficient de correction de cisaillement, est non seulement simple mais efficace pour l’étude de la stabilité des plaques