JFAS_Vol 11 N 01

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ADSORPTION OF Co (II) IONS FROM AQUEOUS SOLUTION ONTO TEA AND COFFEE POWDER: EQUILIBRIUM AND KINETIC STUDIES
(university of el oued/جامعة الوادي, 2019-01-01) Elsherif, K. M; Haider, I; El-Hashani, A
Adsorption of Co(II) ions from aqueous solutions onto Tea and Coffee powders has been examined in a batch adsorption process. The adsorption of Co(II) ions was found to be dependent on contact time, pH of solution, initial metal ion concentration, and adsorbent dose. The experimental equilibrium adsorption data were studied by Langmuir, Freundlich, Temkin and . The Langmuir model display demonstrated a superior fit than the other three models by higher correlation coefficient, R2. The maximum adsorption capacities calculated from the Langmuir isotherm model were 244 mg/g, for both coffee and tea at optimum circumstances. The kinetic studies denoted that the adsorption process of Co(II) ions followed well pseudo-second-order model. According to the adsorption capacity, coffee and tea powder considered as an effective, low cost, and environmentally friendly adsorbent for the removal of Co(II) ions from aqueous solutions
AGRONOMIC CHARACTERIZATION OF SELECTED CLONES OF TUNISIAN TABLE OLIVE (Olea europaea. L) VARIETY ‘MESKI
(university of el oued/جامعة الوادي, 2019-01-01) Ben Amar, F; Arfa, H; Yengui, A
The clonal selection carried out within the Tunisian olive table variety Meski allowed to select three more productive clones. The agronomic characterization of these clones was carried out during four years (2012 to 2015). The analysis of variance revealed that the clonal effect was not significant for the fruit pomology indicating a high homogeneity of the selected clones and significant only for olive production. The variation in endocarp weight and fruit specific density (weight/volume) was very low between years and these parameters could be considered as characterization criteria for the Meski variety. The correlations between the pomological parameters show that the variations are proportional between the fruit and the pulp weights and the volume. Olive production is negatively correlated with fruit and pulp weights. The hierarchical classification shows that the three clones are grouped mainly according to the year. Principal component analysis shows that the first component accounts for 66% of the total variability and is positively correlated with fruit and pulp weights and volume.
BLOCK PROCEDURE WITH IMPLICIT SIXTH ORDER LINEAR MULTISTEP METHOD USING LEGENDRE POLYNOMIALS FOR SOLVING STIFF INITIAL VALUE PROBLEMS
(university of el oued/جامعة الوادي, 2019-01-01) Berhan, Y; Gofe, G; Gebregiorgis, S
In this paper, a discrete implicit linear multistep method in block form of uniform step size for the solution of first-order ordinary differential equations is presented using the power series as a basis function. To improve the accuracy of the method, a perturbation term is added to the approximated solution. The method is based on collocation of the differential equation and interpolation of the approximate solution using power series at the grid points. The procedure yields four linear multistep schemes which are combined as simultaneous numerical integrators to form block method. The method is found to be consistent and zero-stable, and hence convergent. The accuracy of the method is tested with some standard stiff first order initial value problems. All numerical examples show that our proposed method has a better accuracy than some existing numerical methods reported in the literature
BRANCH AND BOUND METHOD TO RESOLVE NON CONVEX QUADRATIC PROBLEMS OVER A RECTANGLE OF
(university of el oued/جامعة الوادي, 2019-01-01) Gasmi, B; Benacer, R
We present in this paper a new convergence of the Branch and Bound method to resolve a class of non convex quadratic problems over a rectangle of Rn . We construct an approximate convex quadratics functions of the objective function in ordre to determinate the lower bound of the global optimal value of the original problem (NQP) over each subset of the feasible domain of the optimization problem. We applied the partition and reduction technical on the feasable domain t o accelerate the convergence of the proposed algorithm. Finally, we give a simple comparison between this method and another method wish has the same principle with examples.
CHARACTERIZATION OF UNDERLYING LAYER STABILIZATION MATERIAL FOR MECHANISTIC-EMPIRICAL DESIGN OF RIGID PAVEMENTS
(university of el oued/جامعة الوادي, 2019-01-01) Saadatinezhad, M; Hasanzadeh, A; Kateb, M
The Mechanistic-Empirical Pavement Design Guide (MEPDG) is applied to calculate pavement responses against the cumulative damage over time, taking into account the general properties of materials, traffic, environmental conditions and pavement structure. The procedure described in the guide was used in this paper to provide appropriate design alternatives for the existing conditions. The two most common types of rigid pavements for highways, Continuously Reinforced Concrete Pavement (CRCP) and Jointed Plain Concrete Pavement (JPCP) were considered in the design. The base layer material was chosen in such a way that a reasonable design life and distress level can be obtained. For each type of chemical stabilization techniques of the underlying layers, the satisfactory design cases were proposed based on the M-E design procedure. For CRCP, the results were also compared with those obtained from the procedure suggested by Texas Department of Transportation (TxDOT) pavement design manual.
COMMUNICATION OF MATLAB GUI AND ANSYS MAXWELL: AN EDUCATION TOOL FOR TUBULAR LINEAR GENERATOR
(university of el oued/جامعة الوادي, 2019-01-01) Arslan, S; Gürdal, O; Akkaya Oy, S
In this study, analytical calculations of a tubular linear generator model are performed by using Matlab Gui for free-piston applications. A training tool including the processes of design of linear generator, sizing with the analytical equations and analyzing with the finite elements methods was suggested. Geometric dimensions in Matlab Gui interface are solved by transferring automatically to finite element model Ansys-Maxwell 2D-rz plane. The results of analytical analysis are in concordance with the results of finite elements. In addition, Ansys-Maxwell Script and Matlab codes are given in the appendix.
COMPARATIVE STUDY ON THE USE OF ZEOLITE AND PRECIPITATION AGENTS TO RETARD SCALE FORMATION IN THE SEAWATER PRETREATMENT PROCESS
(university of el oued/جامعة الوادي, 2019-01-01) Dahmani, K; Belloul, M; Kherroub, D. E
The scale formation in heat transfer surfaces in seawater desalination plants by multi stage flash processes (MSF). This scale is formed during the precipitation of salts containing in seawater such as calcium and magnesium carbonates. The pretreatment is based on the removal of the calcium and magnesium cations from seawater, using zeolite as cation exchanger and precipitator agents as: lime, soda ash, and mixture of soda ash with soda. DRX, SEM, and EDX analyses were employed to characterize the zeolite before and after pretreatment so as to demonstrate the change composition on the zeolite surface. The results revealed that the pretreatment by a mixture of soda ash (13g/L) and soda (4g/L) favor the precipitation of calcium and magnesium ions. The calcium and magnesium ion concentrations in seawater were reduced, respectively, from 620 mg/L and 644 mg/L to 5 mg/L and 9.11 mg/L
DEFORMATION MECHANISMS, TIMING AND SHEAR SENSE ANALYSIS OF PART OF THE PRECAMBRIAN TERRAIN OF SOUTHWESTERN NIGERIA
(university of el oued/جامعة الوادي, 2019-01-01) Adedoyin, A. D; Ebiri, E. P; Alebiosu, M. T
The study area is part of the polycyclic Precambrian Basement Complex of southwestern Nigeria, which comprises meta-sediments and granitoids of varying compositions. The area was primarily deformed into a large-scale sheeted structure, which was sequentially followed by developments of first and second phases of folding that interfered with each other. Brittle to semi-ductile shear deformations, initiated by an ESE-directed transport of the hanging wall of a major NE-SW trending low-angle normal fault culminated in the third phase of fold and development of widespread shear zones. Latter phases of deformation resulted in rotation of finite strain axis relative to the instantaneous strain during a non-coaxial progressive simple shear deformation. We posit that the dominant terminal mechanism of deformation in the area is the late-kinematic progressive heterogeneous simple shear during the late- to post-Pan African orogenesis.
DEFORMATION MECHANISMS, TIMING AND SHEAR SENSE ANALYSIS OF PART OF THE PRECAMBRIAN TERRAIN OF SOUTHWESTERN NIGERIA
(university of el oued/جامعة الوادي, 2019-01-01) Adedoyin, A. D; Ebiri, E. P; Alebiosu, M. T
The study area is part of the polycyclic Precambrian Basement Complex of southwestern Nigeria, which comprises meta-sediments and granitoids of varying compositions. The area was primarily deformed into a large-scale sheeted structure, which was sequentially followed by developments of first and second phases of folding that interfered with each other. Brittle to semi-ductile shear deformations, initiated by an ESE-directed transport of the hanging wall of a major NE-SW trending low-angle normal fault culminated in the third phase of fold and development of widespread shear zones. Latter phases of deformation resulted in rotation of finite strain axis relative to the instantaneous strain during a non-coaxial progressive simple shear deformation. We posit that the dominant terminal mechanism of deformation in the area is the late-kinematic progressive heterogeneous simple shear during the late- to post-Pan African orogenesis.
DESIGN AND IMPLEMENTATION OF NONLINEAR PID CONTROLLER FOR A QUADROTOR CONTROL
(university of el oued/جامعة الوادي, 2019-01-01) Medjdoubi, O; Hazzab, A; Alalei, A
The following article represents the control of an unmanned airborne vehicle (Quadcopter), using nonlinear PID controllers in order to control the altitude, as well as the attitudes (pitch, roll and yaw) of the Quadcopter. Two approaches have been proposed for adjusting the parameters of a PID controller. Foremost, the PID controller gains are settled in an ideal way by using a reference model strategy. In the moment approach, these parameters are adjusted Nonlinear PID. MATLAB/Simulink has been utilized to test and compare the execution of the controllers gotten. The obtained results using the nonlinear PID controllers show the efficiency of the proposed controllers it presents a response with less error and minimal over shoot compared to the results of classical PID controller.
EFFECT OF SALINITY ON THE PHYSIOLOGICAL BEHAVIOR OF THE OLIVE TREE (VARIETY SIGOISE
(university of el oued/جامعة الوادي, 2019-01-01) Boualem, S; Boutaleb, F; Ababou, A; Gacem, F
Salinity is a major problem directly affecting the ecological balance and the development of agriculture in the Mediterranean basin, particularly North Africa. This phenomenon is considered as the most important abiotic factor limiting crops growth and productivity, degrading and polluting soils in arid and semi-arid. In order to study the influence of salinity, on the physiological parameters and to assess the potential of adaptation of the olive tree in a saline environment, three parcels containing the Sigoise variety and subject to different degrees of salinity were selected: Parcel 1 (non-saline); Parcel 2 (saline); Parcel 3 (very saline). Under a saline constraint, the results showed two contrasting tendencies, an intense increase in the content of proline, sodium (Na+) and chlorophyll (b), while water content, potassium and chlorophyll (a) decreased strongly with increasing salinity.
EFFECT OF SALINITY ON THE PHYSIOLOGICAL BEHAVIOR OF THE OLIVE TREE (VARIETY SIGOISE)
(university of el oued/جامعة الوادي, 2019-01-01) Boualem, S; Boutaleb, F; Ababou, A; Gacem, F
Salinity is a major problem directly affecting the ecological balance and the development of agriculture in the Mediterranean basin, particularly North Africa. This phenomenon is considered as the most important abiotic factor limiting crops growth and productivity, degrading and polluting soils in arid and semi-arid. In order to study the influence of salinity, on the physiological parameters and to assess the potential of adaptation of the olive tree in a saline environment, three parcels containing the Sigoise variety and subject to different degrees of salinity were selected: Parcel 1 (non-saline); Parcel 2 (saline); Parcel 3 (very saline). Under a saline constraint, the results showed two contrasting tendencies, an intense increase in the content of proline, sodium (Na+) and chlorophyll (b), while water content, potassium and chlorophyll (a) decreased strongly with increasing salinity.
EFFECTS OF MAGHNITE NANOCLAY MODIFICATION AND COMPATIBILIZATION ON THE PHYSICAL AND MORPHOLOGICAL PROPERTIES OF POLY(VINYL CHLORIDE)/POLY(ETHYLENE-CO-VINYL ACETATE) BLENDS
(university of el oued/جامعة الوادي, 2019-01-01) Bouaziz, I; Doufnoune, R; Haddaoui, N; Benachour, D; Baltä-Calleja, F. J
In this research work poly(vinyl chloride)(PVC), ethylene vinyl acetate copolymer (EVA), and Maghnite nanoclay (MGT) were used to prepare PVC/EVA nanocomposites. The MGT clay was intercalated with octadecyltrimethylammonium chloride (ODTMA) and grafted with γ-aminopropyltriethoxysilane (APTES). The blend nanocomposites were prepared through the melt mixing of PVC/EVA blend at a weight ratio of 50/50 (wt%/wt%) with 20 wt% of compatibilizer; ethylene vinyl acetate grafted with an alcohol (EVA-g-OH) and 3 wt% of modified MGT clay using a Brabender plastograph. The nanocomposites so prepared were characterized using X-ray diffraction, TGA/DTA, mechanical tests and SEM. The results showed that when PVC was blended with EVA, with the modified MGT and with the compatibilizer, synergistic effects in the thermal stability and mechanical properties were observed.
ELECTROCHEMICAL BEHAVIOR AND ANALYSIS OF MONURON HERBICIDE IN WATER USING VOLTAMMETRIC METHODS AND PREACTIVATED CARBON PASTE ELECTRODE
(university of el oued/جامعة الوادي, 2019-01-01) Abdou, I; Bouhidel, K. E
This research work dealt with the electrochemical behavior and voltammetric analysis of monuron, a phenyl urea herbicide. The sensitive enhancement of the monuron electrochemical signal, using a pre-activated carbon paste electrode, and the explanation of its mechanism were the main findings of this study. Unlike most used herbicides (linuron, diuron, fenuron, etc), monuron was rarely studied before by electrochemical methods. Indeed the square wave voltammetry allowed to optimize and to analyze monuron in water samples; the results showed two linear ranges of concentration: from 1.98 to 0.39 µg mL-1 and from 0.35 to 0.08 µg mL-1, with detection and quantification limits of LOD= 0.016 µg mL-1 and LOQ= 0.054µg mL-1 respectively. Besides these quantitative results, the anodic oxidation of monuron has been explained by an irreversible adsorption-controlled process, following a “one electron – one proton” mechanism
EVALUATION OF SPECTRUM OCCUPANCY AND COMPARISON FOR THREE DIFFERENT REGIONS
(university of el oued/جامعة الوادي, 2019-01-01) Seflek, I; Yaldiz, E
Radio spectrum is a scarce source and very significant to measure and monitor. The present spectrum must be exploited efficiently since every new application must be allocated to spectrum. With purpose of using the spectrum efficiently, there are worldwide research efforts on dynamic spectrum access. Among these methods, cognitive radio mostly draws attention. In order to carry out dynamic spectrum access studies successfully, available spectrum must be meticulously analyzed. In this paper, spectrum occupancy measurements between 25-3000 MHz frequency bands were made in three different regions (Selçuklu, Karatay, Meram) of Konya, Turkey in outdoors during six months. Obtained data is presented with graphics. The occupancy ratios are %5.12, %4.46 and %4.19 for Selçuklu, Karatay and Meram, respectively
EVALUATION OF THE QUALITY OF AN INTELLIGENT AND SUSTAINABLE TOURIST URBAN SYSTEM IN TLEMCEN
(university of el oued/جامعة الوادي, 2019-01-01) Moulay, N; Bekkouche, A
This article proposes the evaluation of a tourist urban system "Plateau LallaSetti, Tlemcen" in a global framework for the elaboration of a territorial diagnosis with a view to taking charge of urban complexity. The integrated "Quality Safety Environment" approach, which is very suitable for dealing with the complexity of urban systems, aims to introduce the site to urban sustainability by putting the principles of sustainable development by involving all stakeholders in decision-making through participatory governance by introducing the notion of urban intelligence. This approach guarantees a consensus upstream of the decision-making process, reducing the likelihood of conflict situations linked to contradictory positions of its actors compared the main orientations governing the urban project.
EXAMINING THE EFFECTS OF HYDRO-ALCOHOLIC EXTRACT OF MOMORDICA CHARANTIA FRUIT ON AVOIDANCE MEMORY ALTERATIONS IN MICE USING STEP-THROUGH MODEL
(university of el oued/جامعة الوادي, 2019-01-01) Miri, A; Askari, S. F; Shahraki, E
Medicinal plants have been, and still are, of a particular value and importance for public health provision in terms of both treatment and prevention of diseases. Among the effects of such plants are the impacts on the memory and learning process. In this study, the effect of hydroalcoholic extract of Momordica charantia on the avoidance memory alterations was investigated in mice using the step-through model. The hydroalcoholic extract of the soaked plant was administered to the mice at doses of 10, 25, 50, 100, and 200 mg/kg by gavage (intragastric tube) method. In comparison with the control group receiving only drinking water, the highest memory improvement was observed at a dose of 25 mg/kg. The results of interferential intraperitoneal administration of scopolamine and the extract gavage at a dose of 25 mg/kg indicated the ability to restore scopolamine-induced memory corruption by the total extract of M. charantia.
GRAPHOANALYTIC DETERMINATION OF PARAMETERS RELAXATION DEFORMATION OF ROCKS BY DATA OF DEVELOPMENT OF DEPOSITS
(university of el oued/جامعة الوادي, 2019-01-01) Kazymov, B. Z
As a rule, to determine the deformation parameters of rocks, the results of the interpretation of the actual data of hydro-gas-dynamic studies of wells are used in the non-static mode. In the article, a technique different from this approach for determining the parameters of the relaxation deformation of rocks according to the data of the development of gas deposits is given. The proposed technique is characterized by its versatility due to the fact that, in contrast to the methods based on specially conducted hydro-gas-dynamic studies of wells, the field development data is used, and also changes in the real properties of the reservoir system, as saturation and super-compressibility factors of the gas
IN VITRO ANTIOXYDANT ACTIVITY AND TOTAL PHENOLIC CONTENT OF EXTRACTS FROM THE ENDEMIC ARGANIA SPINOSA (L.) SKEELS FROM ALGERIAN SAHARA
(university of el oued/جامعة الوادي, 2019-01-01) Oughilas, A; Cheriti, A; Reddy, K. H; Govender, P
The BuOH fractions prepared from 80% MeOH extract of the leaves from the endemic Saharan tree Argania spinosa (L.) Skeels exhibited the most potent antioxidant capacity ( IC50 = 2.41 ± 0.38 g/mL for DPPH and 7.95 ± 0.54 g/mL for superoxide anion radical), compared to the EtOAc and CHCl3 fractions. The results showed that BuOH extract fraction exhibited a strong antioxidant activity and had the most potent scavenging abilities which may be correlated to the presence of Phenolic compounds.
IN VITRO ANTIOXYDANT ACTIVITY AND TOTAL PHENOLIC CONTENT OF EXTRACTS FROM THE ENDEMIC ARGANIA SPINOSA (L.) SKEELS FROM ALGERIAN SAHARA
(university of el oued/جامعة الوادي, 2019-01-01) Oughilas, A; Cheriti, A; Govender, P.
The BuOH fractions prepared from 80% MeOH extract of the leaves from the endemic Saharan tree Argania spinosa (L.) Skeels exhibited the most potent antioxidant capacity ( IC50 = 2.41 ± 0.38 g/mL for DPPH and 7.95 ± 0.54 g/mL for superoxide anion radical), compared to the EtOAc and CHCl3 fractions. The results showed that BuOH extract fraction exhibited a strong antioxidant activity and had the most potent scavenging abilities which may be correlated to the presence of Phenolic compounds.

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