JFAS_Vol 11 N 01
Permanent URI for this collection
Browse
Recent Submissions
Item 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.Item 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, FSalinity 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.Item 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, PThe 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.Item 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, FSalinity 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.Item SEMI-THEORETICAL APPROACH TO THE EFFECT OF ROUGHNESS ON THE RELATIVE HEIGHT OF THE HYDRAULIC RESSAGE EVOLVING IN A TRIANGULAR CHANNEL(university of el oued/جامعة الوادي, 2019-01-01) Kateb, S; Ghomri, A; Debabeche, MThe study aims to analyze the theoretical and experimental jump evolving in a triangular channel with a rough bottom. The principal goal of the study is to find a general relationship connecting the relative downstream height and the channel bottom roughness. This study will show also that the channel roughness contributes in the decrease of the downstream height of the jump.Item 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, RWe 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.Item 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, AThe 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.Item PHYSICO-CHEMICAL PROPERTIES OF SILURIAN HOT SHALE IN AHNET BASIN, ALGERIA (CAS STUDY WELL ASS-1)(university of el oued/جامعة الوادي, 2019-01-01) Kadri, M. MThe prediction of hot shale interval in Silurian formation in a well drilled vertically in Ahnet basin Is by logging Data (Resistivity, Gamma Ray, Sonic) with calculation of total organic carbon (TOC) using ∆ log R Method. The aim of this paper is to present Physico-chemical Properties of Hot Shale using IR spectroscopy and gas chromatography-mass spectrometry analysis, This mixture of measurements evaluation and characterisation show that the hot shale interval located in the lower of Silurian, the molecules adsorbed at the surface of shale sheet are significantly different from petroleum hydrocarbons this result are also supported with gas-liquid chromatography showed that the study extract is a hydroxypropylItem MANAGEMENT OF A MAIN CITRUS PEST BLACK PARLATORIA SCALE PARLATORIA ZIZIPHI (LUCAS) (HEMIPTERA: DIASPIDIDAE) IN THE MEDITERRANEAN BASIN(university of el oued/جامعة الوادي, 2019-01-01) Haddad, N; Sadoudi, D; Garcia-Mari, FThe scale of black parlatoria, Parlatoria ziziphi (Lucas) (Hemiptera: Diaspididae), causes considerable damage to citrus fruits in the Mediterranean basin. For well managed this pest, we carried out a thorough ecological and behavioral study on the preference of localization and fixation of this pest on the citrus tree throughout the year for two years in six different citrus orchards to know: the lemon, the clementinier and the orange variety Thomson and washington in Tizi Ouzou, sub-humid region of the Mediterranean, in the North of Algeria. This new information on the biology and behavior of P. ziziphi could be applied to the definition of a better pest management strategy and to improvement of sampling methodology for monitoring this devastating pest by the good recognition of its place of infestations.Item KINETIC STUDY OF FERMENTATION OF FERMENTABLE SUGARS PRESENT IN DATES VARIETY GHARS OF EL OUED REGION(university of el oued/جامعة الوادي, 2019-01-01) Ocif Khaled, M.T; Ladjel, SDates variety Ghars from the region of El Oued in the south east of Algiers these dates rich in fermentable sugars are used for the production of bioethanol by fermentation. In this study we prepared bioethanol by fermentation of date must at the laboratoryl, to understand the kinetics of this transformation we followed the evolution of the must density, the sugar content, the pH and the absorption light at 490nm during fermentation.Item 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, AThis 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.Item SYNTHESIS, ELECTROCHEMICAL AND HETEROGENEOUS ELECTROCATALYTIC BEHAVIORS OF A NOVEL NON SYMMETRICAL COPPER(II) COMPLEX(university of el oued/جامعة الوادي, 2019-01-01) Bounab, N; Ourari, A; Derafa, W; Aggoun, DWe describe in this paper the synthesis of new unsymmetrical tetradentate copper(II) Schiff base complex, prepared from tridentate Schiff base ligand (HL) and pyridine molecule. This new copper complex was identified by various physicochemical characteristics such as elemental analysis (EA), FT-IR, UV-Vis, XPS analysis and thermogravimetry (TG/DTG). The electrochemical behavior of the copper(II) complex was investigated by cyclic voltammetry in N,N-dimethylformamide (DMF). These experiments have been allowed to obtain new conducting polymeric films, prepared by successive cycling at the suitable potentials. These polymeric films containing metallic centers were studied to evaluate their electrocatalytical performances in which copper (II) ions were used as electrocatalysts in the heterogeneous conditions for the electroreduction of 1,4-dibromobutane.Item 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. JIn 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.Item SURFACE MODIFICATION OF SILICA NANOPARTICLES BY MEANS OF SILANES: EFFECT OF VARIOUS PARAMETERS ON THE GRAFTING REACTIONS(university of el oued/جامعة الوادي, 2019-01-01) Bounekta, O; Doufnoune, R; Ourari, A; Riahi, F; Haddaoui, NThe adsorption of four silanes, namely: N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane (AEAPTMS), 3-methacryloxypropyltrimethoxysilane (MPTMS), allyltrimethoxysilane (ATMS), N-2-[(N-vinylbenzylamino)ethyl]-3-aminopropyltrimethoxysilane hydrochloride (CVBS) onto the surface of silica nanoparticles has been studied using water/ethanol (5/95, v/v) mixture. Four experimental parameters were explored for the grafting of the silanes: pH, concentration, time, and temperature. Possible interactions between the silanes and the surface of silica were investigated by means of FT-IR Spectroscopy. The FT-IR analyses confirmed the effectiveness of the silanization of the silica surface. The amount of the adsorbed silane on the silica nanoparticles appeared to be influenced by the initial concentration of the silane, pH, time and temperature of modification.Item EVALUATION OF SPECTRUM OCCUPANCY AND COMPARISON FOR THREE DIFFERENT REGIONS(university of el oued/جامعة الوادي, 2019-01-01) Seflek, I; Yaldiz, ERadio 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, respectivelyItem 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. EThe 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/LItem 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. ZAs 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 gasItem STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF Fe-DOPED NiAl2O4 OXIDES(university of el oued/جامعة الوادي, 2019-01-01) Tibermacine, W; Omari, MA new spinel solid solution system of Ni1-xFexAl2O4 (0.0 ≤ x ≤ 0.5) was synthesized through sol-gel method. The effect of Fe doping on the nickel aluminate prepared was investigated. The synthesized powders were characterized by means of X-ray diffraction, thermogravimetric and differential thermal analysis, fourier transform infrared spectroscopy, scanning electron microscopy and electrochemical measurements. From the preceding analysis, it can be shown that compounds show a single spinel phase in the temperature range 650-1000°C and the solubility of iron in the NiAl2O4 structure was limited to samples with the iron content x < 0.6. The electrochemical measurements indicate that the catalytic activity is strongly influenced by iron doping. The highest electrode performance is achieved with Ni0.7Fe0.3Al2O4 (i=86.84 mA/cm2) which is ~ 27 times greater than that of NiAl2O4 ( i=3.22 mA/cm2) at E= +0.8V. After one hundred cycles, the stability of the doped electrode with 30% of iron is much better than the undoped electrodeItem REVIEW ON THERMAL INSULATION OF BUILDINGS WITH PHASE CHANGE MATERIALS: INCORPORATION METHODS AND APPLICATIONS(university of el oued/جامعة الوادي, 2019-01-01) Sarri, A; Bechki, D; Boughali, S; Bouguettaia, HReducing energy consumption is an increasingly important issue for the residential sector. As a result, attention to thermal insulation systems for buildings has increased in recent years. The use of phase change materials (PCMs) is an attractive way for the development of energy-efficient buildings by integrating with the walls, ceiling and floor, which offers considerable possibilities for insulation and to ensure a certain thermal comfort, because of their high storage density. This paper summarizes the essential knowledge on solid-liquid phase change theory, PCM classification, some previous work on storage of latent thermal energy in buildings, covering experimental and numerical studies with different applications of PCMs to buildings.Item 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, MThe 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.