JFAS_Vol 03 N 02
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Item The Effect Of Addition Of Nd3 + On Dielectric Properties Of Pb[zr0.45ti0.45(zn1/3, Sb2/3)0.1]o3 System(University of Eloued جامعة الوادي, 2011-07-01) Abdessalem, N.; Boutarfaia, A.; Abba, M.; Necira, Z.This work aims at, to study the influence of Nd3+ on the dielectric properties of a ceramics material of general formula: Pb[Zr0.45 Ti0.45 (Zn1/3, Sb2/3) 0.1]O3 and of structure perovskite. The selected samples were prepared by the method of synthesis with solid way. The study of the dielectric properties of the system showed that the values of the permittivity, the resistivity, increase with the addition of Nd+3 1%.Item Analysis Of A Data Base Of Chalcopyrite Semiconductors In 2 And 3 Dimensions(University of Eloued جامعة الوادي, 2011-07-01) Ferouani, A. M.; Merad Boudia, M. R.; Hachemi, H.The analysis of the data is currently, in the statisticians, the object of a true phenomenon of mode, characterized at the same time by the passion and the rejection. To determine the characteristics of a whole of data is obviously not an end in itself, but this lapse of memory is unfortunate because the type of data available always influences the direction of research. The factorial analysis in normalized principal components (PCA), is particularly adapted to the reduction of tables of measurements, where one generally works on a matrix of correlation between characters. In this article we will report our results of analysis into 2 and 3 dimensions of the molecular weight and energy of plasmon of semiconductor chalcopyrites by using what one call the datamining materials. All information was presented in the tables envisaged by an ACP method of the semiconductors étudiés. L' analyzes factorial substitutes for primitive measurements of new variables or factors (which are linear combinations of the primitive variables) with the help of which it is thus possible to optimize the visualization of the data in a restricted number of figures. Large at the modo we present, the results related to the development of new approaches of Datamining, Analysis in principal components (ACP), of the data-processing techniques which were applied to semiconductors and combined with metals to predict new materials or ultra stable coatings.Item Eco-technique Of Sewer Renovation Using Composite Shells: Structural Analysis(University of Eloued جامعة الوادي, 2011-07-01) Attaf, B.An eco-technical renovation of the sewage system is developed in this paper; this technique involves incorporating into the existing sewer a series of jointed prefabricated sandwich or composite shells. The purpose of his study is to determine the structural shell deflection, the high displacement areas and to validate the non-failure criterion for each ply constituting the inner and outer laminate facings. The numerical results were obtained at low cost by using the finite element method. Studies have focused on structural analysis of a typical shell unit with an ovoid form (egg-shaped section) when it is subjected, during annular space filling operation, to pressure forces generated by wet concrete. To ensure the safety of the composite shell structure, Tsai-Hill criterion function is applied and results are presented for the most stressed plies.Item Square Wave Voltammetric Determination Of Lead In Commercial Kohl Using A Glassy Carbon Electrode(University of Eloued جامعة الوادي, 2011-07-01) Saha, M. A.; Alia, M.; Rebiai, A.; Lanez, T.A simple sensitive square wave voltammetric method for the determination of lead contamination of several kohl samples purchased from Algeria retail stores was developed using glassy carbon electrode. The peak current response of 5 standards aqueous solution of lead in NaNO3 as supporting electrolyte was observed showing a linear calibration curve in the concentration range of 4×10-3 – 2.5×10-4 mol/l of lead. Over this concentration range, the equation obtained from the linear calibration graph for lead is Y = 0.00068 + 0.0093x with a correlation coefficient of r2 = 0.987. Following this step, the potential of an aqueous solution of 12 kohl samples containing 2 M nitric acid solution as supporting electrolyte is then swept in the same range of potential (-400 to -700 mV). The amount of lead is then deduced using the linear calibration graph for lead. The results showed up to 52.14% of lead present in kohl, this concentration was over the safe limits of lead set by the world health organization standards. However; only five commercial samples of koItem Reinvestigation Of Essential Oil Content Of Thapsia Garganica Grown In The East Of Algeria(University of Eloued جامعة الوادي, 2011-07-01) Ladjel, S.; Zellagui, A .; Gherraf, N.Thapsia garganica is a very famous medicinal plant known especially for its therapeutic effects such as diuretic, emetic and purgative. A resin is extracted with alcohol from the bark of the root. The plant has been considered specific in treating pain, though caution is advised since it is poisonous to some mammals. The plant is also strongly rubefacient, producing blisters and intense itching. In the present study, we have undertaken a Reinvestigation of essential oil content of this widely used plant because of its important bioactive effect to heal many ailments.Item Contribution To The Development Of A Simulation Software Performance And Sharing Ratio In Liquid-liquid Extraction(University of Eloued جامعة الوادي, 2011-07-01) Hadj Seyd, A.; Lanez, T.The present work is to develop software to predict the value yield and the distribution coefficient in the process of liquid-liquid extraction of components of a mixture, from mathematical models expressing these entities, based on equations equilibrium between liquid-liquid phases, and predict the conditions under which the extraction operation is favorable, unfavorable or impossible to realize, by studying the variation of the entities cited, based on the parameters influencing the extraction, which are: initial concentrations, rate of solvent and pH, in the case of a simple extraction (extraction of neutral products) or when it is reactive (extraction of complex acids or bases) for one or more components. The programming language used is "Delphi" which is a very powerful oriented object programming under Windows.Item Prediction Of Octanol/water Partition Coefficient Of Selected Ferrocene Derivatives Using Rekker Method(University of Eloued جامعة الوادي, 2011-07-01) Ahmedi, R.; Lanez, T.In this work we present a theoretical approach for the determination of octanol/water partition coefficient of selected ferrocenes bearing different substituents, the calculation is based on the adaptation of the Rekker method. Our prediction of obtained theoretical partition coefficients values of logP for all studied substituted ferrocene was confirmed by comparison with known experimental values obtained mainly from literature. The results obtained show that calculated partition coefficients are in good agreement with experimental values. For estimation of the octanol/water partition coefficients of the selected compounds, the average absolute error of log P is 0.13, and The correlation coefficient is R2 = 0.966.Item The Synthesis Of (5-hydroxy-5-(1-methoxypropan-2-yl) -4-methylfuran-2(5h)-one, 5-(1-methoxypropan-2-yl) -4-methylfuran-2(5h)-one) And Biological Activity(University of Eloued جامعة الوادي, 2011-07-01) Gherraf, N.; Tamma, N.Butenolides are a class of lactones with a four carbon heterocyclic ring structure. They are sometimes considered as oxidized derivatives of furan. The simplest butenolide is 2-furanone, which is a common component of larger natural products and is sometimes referred to as simply "butenolide". A common biochemically important butenolide is ascorbic acid (vitamin C). The butenolide and their analogues represent a wide range of the natural compounds of medical and biological importance. In the last decades, a great number of compounds of various structures, in general from Alkylidene butenolide were isolated and showed biological activities. In this work we have studied the reactivity of some alkylidene butenolide and carried out their antibacterial activity.Item Electrochemical Studies Of N'-ferrocenylmethyl-n'-phenylbenzohydrazide At Glassy Carbon Electrode In Different Medium(University of Eloued جامعة الوادي, 2011-07-01) Khelef, A.; Neghmouche, N. S.; Lanez, T.The oxidative electrochemistry of N'-Ferrocenylmethyl-N'-Phenylbenzohydrazide FcX was studied in acetonitrile with tetrabutylammonium hexafluorophosphate as the supporting electrolyte and aqueous ethanol using the electrochemical technique. This study using cyclic (CV) and rotating disk electrode (RDE) voltammetry showed that the FcX/FcX+ redox couple is reversible in this electrolytes. The effects of changing the scan rate on the electrochemical behavior of ferrocene have been examined. A comparison of the electrochemical behavior of ferrocene and N'-Ferrocenylmethyl-N'-Phenylbenzohydrazid have been examined.Item Evaluation Of The Inhibitory Effectiveness Of Three Ferrocene Derivatives For Corrosion Of Steel Xc70 By Spectroscopy Of Electrochemical Impedance(University of Eloued جامعة الوادي, 2011-07-01) Rahim, O.; Ben Chenna, A.; Zaiz, T.; Chaouch, K.; Lanez, T.In this work, we studied the efficacy of corrosion inhibition of carbon steel X70 in HCl 1M solution using ferrocenyl compounds prepared in VPRS laboratory, these compounds are: N-(férrocenyl méthyl)-2-nitro aniline(Fc12), N-(férrocenyl méthyl)-3-nitro aniline(Fc13) and N-(férrocenyl méthyl)-4-nitro aniline(Fc14). The inhibitory potency of these compounds was determined by the electrochemical impedance spectroscopy (EIS). The overall results show that these compounds have varying percentages of inhibition. The adsorption of these compounds on the surface of the metal is a chemical adsorption. In HCl 1M, the compound Fc12 had the best ability of inhibition at a concentration of 70ppm (R = 91.24%).