المقالات العلمية لاساتذة كلية العلوم والتكنولوجيا
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Item Study of the Effect of Some Parameters Governing the Recovery Process of Acetic Acid from Waste Water by Alcohols(university ghardaia-jarst, 2014) Hadj Seyd, Abdelkader; Lanez, Touhami; Gharib, ToufikOptimization of experimental conditions of acetic acid recovery from its aqueous solution by a liquid-liquid extraction, with alcohols, was carried out in this study. The effect of parameters governing the process such as: pH of aqueous solution, partition coefficient and initial concentration on acid, volume ratio between phases and temperature, were studied. Variation of distribution coefficient and yield of extraction of acetic acid, depending on these parameters, was investigated to determine the favorable conditions to recover this acid from its aqueous solution. Results show that, in comparison to the other alcohols used, butan-1-ol gives the higher values of yield and distribution coefficient, the optimal conditions of extraction are obtained at low pH values, a yield of 64.4 % was obtained at pH 1.40 . A departure solution concentrated on acid and a high volume ratio of organic solvent favor the extraction (79.78 % of the acid were extracted for Vorg/Vaq=3:1). Finally, we noted that the yield and the distribution coefficient increase with increasing temperature, nearly 69.62 % of acetic acid were extracted at 318.15 K. The study will be useful in the design of liquid-liquid extraction process by alcohols for acetic acid recovery.Item Etude de la Minéralisation et de la Granulométrie des Sols de la Sebkha de Ouargla(university ghardaia-jarst, 2014) BOUTELLI, Med Hichem; Abdelkader, HADJ SEYDThe Sebkha of Ouargla is located north-west of the city of Ouargla in the lower Eastern Sahara. The climate of the region is known for its particularly marked by low and erratic rainfall aridity, in one hand, and the thermal amplitudes and temperatures too high on the other. This aridity is not observed only on the lack of rainfall, but also by high evaporation which is one of the current major climatic factors prevailing in the region. The latter exceeds 380 mm in July. To understand the evolution of salinity in this system, physico-chemical study of various constituent training is conducted along a north-south profile. Six piezometers were installed for sampling of surface water and groundwater monitoring groundwater level. Particle size analysis is used to determine the relative amount of different elements constituting the ground (gravels, sands, silts, clays). The size distribution curves showed that most of the samples belong to the class of arenites. This is mostly fine sand (84%) and medium sand (10%). The physico-chemical analysis of the soil 1/5 affirms the high salinity of samples. The values of electrical conductivity at 25 ° C are between 3.15 and 24.26 dS.m-1. The insoluble rate exceeds 80%, the gypsum is more than 12% while the limestone is negligible (<2%).Item Inhibition de la Corrosion de l’Acier au Carbone X-52 dans un Milieu H2SO4 (20%) par 3-Méthyle-Thio-4- Tolyl-1,2-Dithiolylium, Contre Anion (CH3SO4 - )(university ghardaia-jarst, 2014) Khaled, Mansouri; Mokhtar, Saidi; Messaouda, DakmoucheLa corrosion dés métaux est une dégradation électrochimique de ces matériaux sous l’influence oxydante de leur environnement. L’utilisation des inhibiteurs est la méthode le plus pratique pour la protection des métaux contre la corrosion. Notre travail est axé sur l’étude de l’efficacité inhibitrice de corrosion de l’acier au carbone X52 dans un milieu de l’acide sulfurique 20%. En tentant de déterminer l’effet inhibitrice de sel {[3- Méthyle-Thio-4-Tolyl-1,2-Dithiolylium]+ , [CH3SO4] - }, cette étude a été le même selon des méthodes différent de détermination de la vitesse de corrosion (les méthodes électrochimiques «Potentionstat-Galvanostat» et «la spectroscopie d’impédance électrochimique»). La valeur maximale de l’inhibition de corrosion de l’acier obtenu par le composé synthétisé (A) a été de 91,60% à la valeur de 25 ppm. Selon ce résultat, le composé (A) est prouvé efficace a limiter les dégâts de la corrosion avec un acceptable rondement.Item Compilation d’un nouveau logiciel pour l’identification des espèces d’insectes orthoptères(university ghardaia-jarst, 2014) Abdelkader Hadj, Seyd; Abdellahi, Kemass; Toufik, GhribIn this work consists in the development of a software allowing to identify some species of grasshoppers insects based on the identification key of L. CHOPARD. The software "ORTHOPTERISTE" accurately identifies a multitude of these insects (198 species spread over 19 families and 85 genders) belonging to two suborders ENSIFERA (49%) and CAELIFERA (51%). With its interactive graphical interface, guiding the user, step-by-step, the software starts by identifying the sub-order then the super-family then the family and gender, finally arriving to identify and precise the studied specie. Identification is based on etymological, morphological and physiological differences between the said insects.Item Direct Torque Control of Double Feed Induction Machine (DTC-DFIM)(university ghardaia/ JARST, 2014) Sadouni, Radhwane; Zemmit, Abderrahim; Meroufel, AbdelkaderThis paper presents a performances study of a Direct Torque and Flux Control (DTC) for a double feed Induction Machine (DFIM). This method has become one of the high performance control strategies for AC machine to provide a very fast torque and flux control. The performance of DTC strongly depends on the quality of the estimated actual stator flux and torque. The simulation results show the effectiveness and the robustness of the proposed method in both dynamic and steady state response.Item Applying DWT and PCA with Artificial Neural Network for FACE RECOGNITION(university ghardaia-Revue ElWahat pour les Recherches et les Etudes, 2014) Mohammed, Kamel BENKADDOUThis manuscript presents, Face recognition by combining different extraction approaches combining PCA (principal Component Analysis), DWT (Discrete wavelet transform neural networks. This method consists of four steps: i) Preprocessing, ii) Dimension reduction using DWT, iii) feature extraction using PCA and iv) classification using neural network. To validate this work, we have tested this technique on frontal images of the ORL and Yale databasesItem La Méthode d'Adomian Appliquée à L'équation de Bernoulli(university ghardaia-jarst, 2014) Choucha, Abdelbaki; Guerbati, KaddourIn this work we used Adomian decompositional method to solve Bernoulli equation in the formItem Le Prototypage Rapide des Méthodes de Fabrication Express et sur Mesure(university ghardaia-jarst, 2014) Bennouna, Mohammed Salah; Benaoumeur, Aour; Sadek, KaddourThe product design is a complex task which is carried through several stages. It begins with the establishment of functional specifications book (cahier de charges fonctionnel) which details the product features and allows an adequate analysis. This task is entrusted to a multidisciplinary team that launches searches in all directions (market research, the study of similar products and identifying their shortcomings and disadvantages.). An essential step by which the product must successfully pass during its development, this step is the realization of a prototype which will be a test and assurance of the proper functioning of the finished product. The realization of a prototype is itself a complex phase that requires sophisticated equipment and should be realized in as short time as possible in order to bring the product to market in a timely manner. Rapid prototyping offers the possibility of producing the finished products in very short time with more complex shapes.Item Direct Torque Control of Saturated Induction Machine with and without speed sensor(university ghardaia-jarst, 2014) Tahar, Djellouli; Samir, Moulahoum; Med Seghir, BoucheritIn this paper, a modified KALMAN filter is proposed to estimate speed. At first, the influence of the magnetic saturation is taken into account in the modelling. In the second part, the direct torque control (DTC) is elaborated; the control of the speed loop is ensured by an IP controller, the flux and the torque are estimated from source voltages and measured currents. The last part of this work is devoted to the operating system without mechanical sensor, using a KALMAN filter as a speed observer. Simulation results are presented to verify the effectiveness of the proposed approach.Item Effet combiné de la température et de l'attaque au sulfate de magnésium sur la durabilité du mortier à base de ciment composé au laitier(university ghardaia-jarst, 2014) Mohammed Nadjib, AZIEZ; Achour, Abderraouf; Abdelillah, BezzarThe aim of this work is to study the effect of temperature on the durability of mortars in a sulphate- magnesium-rich environment (5% MgSO4).The strength of mortars after 12 months of immersion in the sulphate solution is evaluated by visual observation, mass variation, compressive strength, and XRD analysis. No damage was observed on the samples exposed to the sulphate solution at 20, and 50 °C, except for mortars exposed to 5 °C which are very sensitive to the formation of thaumasite. Results show that high temperature improved the mechanical strength and do not necessarily accelerate the degradation due to magnesium sulphate.Item Recherche et identification de quelques plantes médicinales à caractère hypoglycémiant de la pharmacopée traditionnelle des communautés de la vallée du M’Zab (Sahara septentrional Est Algérien)(university ghardaia-jarst, 2014) KEMASSI, Abdellah; DAREM, Sabrine; CHERIF, Rokaia; BOUAL, Zakaria; SADINE, Salah Eddine; AGGOUNE, Mohamed Salah; OULD EL HADJ-KHELIL, Aminata; OULD ELHADJ, Mohamed DidiL’enquête ethnobotanique menée auprès des herboristes, tradithérapeutes, botanistes, vieux guérisseurs et les pharmaciens de la vallée de M’Zab (région de Ghardaïa Sahara septentrional Est algérien) a permis de recenser 33 espèces réparties dans19 familles botaniques qui sont utilisées dans la préparation de 20 recettes thérapeutiques utilisées en pharmacopée traditionnelle locale pour le traitement du diabète. La famille des Lamiaceae est la plus importante, elle est représentée par 7 espèces, suivies par les Asteraceae par 5 espèces, puis par les Fabaceae, Apiaceae, Malvaceae, Cucurbitaceae et Burseraceae avec 2 espèces chacune, ensuite par les Asclepiadaceae, Papaveraceae, Cucurbitaceae, Myrtaceae, Chenopodiaceae, Zygophyllaceae, Orobanchaceae, Zingiberaceae par une seule espèce chacune. Pour la préparation du remède, les feuilles sont la patrie la plus utilisée (22%), suivies par la tige (18%), la plante entière (15%), puis les graines (12%), les fleurs et les racines (9% chacune), alors que les autres partie de plante dont les fruits, les tiges feuillées et l’écorce ne sont utilisées qu’à une proportion de 3% chacune. La décoction est le principal mode de préparation du remède soit 29%, suivi par l’infusion (23%), la macération et la poudre (21%), en jus et cuite par 3% chacun.Item Direct Vector Control Scheme For a Dual Stator Induction Machine (DSIM) Using Fuzzy Logic controller(university ghardaia/ JARST, 2014) Sadouni, Radhwane; Meroufel, AbdelkaderThis paper presents the direct vector control scheme for a dual stator induction machine fed by a two pulse width modulation voltage source inverters. The simulation results show that the direct vector control with Fuzzy controller provides good dynamic performances and presents a great robustness and efficiency.Item Modélisation et Commande par Mode de Glissement d’une Machine Asynchrone Double Stator(university ghardaia/ JARST, 2020) Sadouni Radhwane, Radhwane; Bellaouar, AbderrahmaneIn this work, the Field Oriented Control with a robust controller by sliding mode, applied to the Dual Star Induction Machine supplied with two PWM voltage source inverters is presented. The simulation results are obtained using the Matlab/Simulink, show the performances and the robustness of the proposed method.