JFAS_Vol 11 N 03
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Item . AN ELECTROCHEMICAL STUDY FOR CORROSION INHIBITION OF IRON BY A DERIVATIVE OF ORGANIC PHOSPHONIUM HALID IN ACID MEDIA(university of eloued جامعة الوادي, 2019-06-01) M.L., Belfar1; H., Zerrouki1; AF., Alaoui1,*; L., Sekhri1,*Steel and its alloys have many industrial applications, especially in the chemical, thermal, nuclear and, recently, in the petroleum industry. Therefore, the study of corrosion and corrosion inhibition of this metal is a very important subject. This work describes the study of the corrosion behavior of XC 70 steel in sulfuric acid medium and the evaluation of the protective power of a series of synthesized compounds such as methyltriphenylphosphonium iodide3. The study was carried out using the Tafel straight line method and electrochemical impedance spectroscopy. The results obtained show that methyltriphenylphosphonium iodide (8) is a very effective mixed inhibitor and reaches a maximum of 83.71% at C = 30 M and for the rotational state of 1500 rpm. The inhibitory efficacy of this compound reaches a maximum of 97.80 at C = 60 M and the results indicate that adsorption is chemisorption following Langmur.Item APPRAISAL OF THE CLIMATIC RESPONSIVENESS OF THE HEALTH CENTRE BUILDING – OBAFEMI AWOLOWO UNIVERSITY, ILE-IFE(university of eloued جامعة الوادي, 2019-06-01) E. D., Okontahe design of a comfortable indoor climate is of great influence on occupant’s health and well-being. This study is focused on appraising the Health Centre Building of Obafemi Awolowo University`s efficiency in producing the required thermal comfort through responsiveness to the local climate or identify its deviations from this issue of climate responsiveness. The climate was analyzed using the Mahoney tables, not excluding the descriptive survey method of gathering data and the critical observation of the building envelopes. Results from the findings showed the lighting within the building needs to be improved upon, the building space should be made to be quite cool and shading devices needs to be incorporated on the required windows. Climate responsive architecture is essential because it makes the building become an intermediary on its own energy housekeeping by opening up to the energy potential of the built environment.Item ASSESSMENT OF IRRIGATIONAL QUALITY OF SURFACE WATERS IN EL TARF AREA, ALGERIA(university of eloued جامعة الوادي, 2019-06-01) L, Zaoui*1,; F. Z, . Kahit1,; M., Benslama1During two seasons (winter and summer), the sampling of surface waters of nine stations along wadi Bounamoussa located in El Tarf which has an agricultural vacation (the extreme Northeast Algerian), is analyzed in order to evaluate preliminarily the pollution of surface water, the study methodology carried out in order to check the current state of water chemistry, its evolution over time and in space depending on the variation of the physicochemical parameters of water. The results of the physicochemical analyses of the waters samples shows that are very poor in soluble and moderately mineralized and accentuated, which can reduce the yield of sensitive plants and cause slow salinization of the soil hence the need for this research. We got the same order of abundance decreasing for both seasons as follows: Na+ > Ca+2 > Mg+2 > K+ and Cl- > SO4-2 > NO3- > NO2- and show that it is appropriate to irrigation and agriculture.Item BIOCHEMICAL AND MICROBIOLOGICAL IDENTIFICATION OF COW'S MILK FOR THE MANUFACTURE OF SOFT CHEESE(university of eloued جامعة الوادي, 2019-06-01) F., Mesli*1; A., . Lazouni Hamadi2Our work focuses on the study of the technological process of making a soft cheese; five samples were the subject of our investigations. These were analyzed during the period of high lactation (January to March 2017). Microbiological and biochemical tests were carried out on five microbial groups and pathogenic organisms. Biochemical identifications are performed to target the most likely bacteria. All the results have been compared is validated by contribution to experimental results as well as theoretical work show a compatibilities and validation by contribution to the norm. The microbiological analyzes of the five samples studied show the total absence of the seeds sought with the exception of FTAM, with a low presence not exceeding the threshold of acceptability. These results indicate that the samples of the milk used in the manufacture of soft cheese are very good from a microbiological point of view.Item BIO-ECOLOGICAL STUDY OF MYZUS PERSICAE (HOMOPTERA, APHIDIDAE) AT EL-OUED REGION, ALGERIA(university of eloued جامعة الوادي, 2019-06-01) A, Haddad*1,; A, Zaater1,; A., Ladjali1 and; A., Djerah2,The region of El-Oued in the south-east of Algeria is arid. A pole of production of greenhouse vegetable crops that are threatened by the green peach aphid (Myzus persicae) that causes damage of up to 35% of the tomato and pepper crop. A study was conducted in 4 Stations, that of S'till, Djamaa, El-Magran and Oued El-Alenda, during the campaigns 2017 and 2018. The results obtained showed that the averages of the numbers of Myzus persicae highest are mentioned in March with 28.48 ± 0.14 individuals on the mercedes variety and 33.99 ± 0.12 individuals on the wided variety and 32.24 ± 0.22 individuals on the sultan variety of pepper. However, the average of the lowest numbers is 1.62 ± 0.03 wided on 0.98 ± 0.07 individuals on Mercedes, recorded during mid-January and 0.72 ± 0.03 aphids on pepper, variety Sultan, on the same date.Item CHARACTERIZATION OF FIVE NEW OLIVE (OLEA EUROPAEA L.) CULTIVARS OBTAINED IN A CROSSBREEDING PROGRAM IN TUNISIA(university of eloued جامعة الوادي, 2019-06-01) I., Guellaoui1,2*,; F., Ben Amar2,; M., Ayadi2,; M., Boubaker1Five new olives (Olea europaea L.) variety issued from a Tunisian breeding program were released in 2017. The objective of this program is to enhancethe quality of the oil of local variety 'Chemlali Sfax', its oil has a moderate rate of oleic acid (55-64 %) and is relatively rich in palmitic acid (17-22 %). A wide genetic diversity was observed within the new cultivars which differ from the typical cultivar. The results of the morphological evaluation of the leaf, fruit and stone showed mainly the appearance of new morphological states for the fruit and the stone and a significant increase of the fruit weight (medium).The fatty acid composition was better than that of Chemlali Sfax varity. In November, the palmitic and linoleic acids concentrations decreased significantly for the different olive oils, while the oleic acid concentrations were higher than the original cultivar. From November to January, the different fatty acid levels were always better than those of Chemlali Sfax.Item COMPARISON OF CHEMICAL COMPOSITION AND ANTIBACTERIAL ACTIVITY OF MENTHA PULEGIUM ESSENTIAL OIL FROM TWO ECOTYPES (EL BAYADH AND DJELFA)(university of eloued جامعة الوادي, 2019-06-01) Z., . Boukhobza1,; A., Cheriti1*; M., Kacimi El Hassani2,; M. B., Lahreche2Mentha pulegium, collected from two different sites in Algerian high plains (El Bayadh and Djelfa), were analyzed to determine essential oil constituency. Essential oils were extracted by hydrodistillation and subsequently analyzed by GC/MS. Quantitative differences were recorded between the percentages of some constituents between plants from the two geographical origin. The most important major components were: 1,8-cineole, menthone, menthol, cis-Pulegone and Pulegone. The antimicrobial activity of the essential oils was tested using the disc-diffusion assay. The results showed that the essential oil of Mentha pulegium had great potential of antibacterial activity against selected bacteriaItem CONTRIBUTION TO THE ANALYSIS OF THE STABILITY OF AN OPEN PIT MINE: CASE OF THE KEF ESSNOUN PHOSPHATE MINE, TEBESSA NORTH-EAST ALGERIA(university of eloued جامعة الوادي, 2019-06-01) A., Tabet1,; I., Nouioua1,; C., Fehdi1,; O., . Zerzour2,; Y., Mehidi1The problems related to slope stability in open pits have become increasingly complicated, where the stability of the terraces and embankments have a greater influence on the productivity and longevity of the mine, this instability can cause enormous damage to personnel and equipment. In this work, the stability analysis begins with a fieldwork where we could see the mine plan, the geometry of the steps, their heights, the different geological formations ... etc. In this way we have studied the stability of the steps of the kef essnoun open pit by the applying the rock mass classification systems and the calculation of the safety factor by the limit equilibrium method. The results obtained from the empirical analyze RMR, SMR and the limit equilibrium method is in general the same, where the marl layer is the probable cause of a massive instability.Item DESIGN, SIMULATION AND REALIZATION OF A COMPACT DUAL BAND MEANDERED COUPLER(university of eloued جامعة الوادي, 2019-06-01) R., El Bouslemti1; . F., Salah-Belkhodja2Telecommunication systems increasingly require the use of miniaturized passive microwave components. One of these is the directional coupler, a four-port component intended to distribute power to two output ports, the fourth port being isolated. This paper proposes a dual-band branch-line coupler (BLC) with an extremely compact microstrip structure. The application of meandering lines as the coupler’s central connector yields dual-band operation. HFSS is used to optimize the device and to verify its transmission characteristics. This yields a design of a coupler with a footprint is 23×34.6 mm², operating at 1.65 / 3.30 GHz, with ports that can be adapted to a load impedance of 50 Ohm. To validate the model, the coupler is fabricated using microstrip technology on a FR4 substrate. A good agreement between measurement and simulation results is obtained. The coupler achieves an excellent isolation of –42.41 dB and a transmission loss of only –2.29 dB at 3.30 GHz.Item DETERMINATION OF THE BINDING PARAMETERS OF THE ADDUCT 3-NITRO PHENYLFERROCENE-DNA USING CYCLIC VOLTAMETRY, ELECTRONIC SPECTROSCOPY AND MOLECULAR DOCKING SIMULATION(university of eloued جامعة الوادي, 2019-06-01) H., . Ben amara*,; , . Lanez T.Binding parameters of the interaction of 3-Nitrophenylferrocene (3FcNO2) with DNA, has been measured by cyclic voltametry (CV) and electronic spectroscopy (Uv-Vis). The obtained results were validated by molecular docking (MD) using AutoDock Tools software. CV results further indicated that 3FcNO2 interact to DNA by hydrogen bonding with binding constant and binding free energy values equal to 7.59×104 M−1 and −27.85 KJ.mol-1 respectively. These values were in a good agreement with those obtained from Uv-Vis measurements. The diffusion coefficient values of the free and bounded 3FcNO2 with DNA obtained from CV experiments were respectively equal to 9.71×10-8 and 4.33×10-9, this finding further confirm the formation of 3FcNO2-DNA adduct. Binding parameters were also estimated by MD, the obtained values were identical to experimental results.Item EFFECT OF BANDELITATION OF IMMAGES ON COMPRESSION BY ALGORITHM SPECK(university of eloued جامعة الوادي, 2019-06-01) M., Hettiri*1,; Z. E., Baarir1.; A., Ouafi1,; A., Taleb-ahmed2The bandelets representation (the bandelitation) effectively gives the contours of the images thanks to the orthogonal bases of bandelets as well as the zones of homogeneous regularity in the form of a residue decomposed in wavelets. The orthonormal framework makes it possible to obtain theoretical results on the approximation capabilities of this representation showing their interest with respect to the two-dimensional separable wavelet bases. However, it remains to confirm these elements by numerical results of compression. We propose in this work a new approach based on the bandelitation effect on the SPECK algorithm "Set Partionning Embedded bloCK". The proposed approach manipulates the coefficients less because it is characterized by additional decorrelations in the exploitation of the geometry of the image.Item EFFECT OF THE CALCINATION TEMPERATURE ON THE OXYGEN EVOLUTION REACTION OVER Pr6O11 OXIDE(university of eloued جامعة الوادي, 2019-06-01) E., Omari*; Z., Ben Adel,; M., Omari*The Pr6O11 oxide synthesized using the citrate sol-gel method was calcined at four temperatures 600, 700, 800 and 900 °C. The prepared powder was characterized by DTA-TGA, XRD, IR, SEM and cyclic voltammetry. The thermal analysis shows an endothermic peak at 765°C attributed the pure cubic phase. XRD diffraction pattern reveal that three phases Pr2CO5, Pr4O7 and Pr6O11 coexist at 600°C. At T ≥ 700°C, the secondary phases Pr2CO5, Pr4O7 disappear while the phase Pr6O11 becomes alone indicating the formation of the pure cubic phase. The microstructural analysis shows that powders are constituted from particles having different shape, size and are agglomerated. The electrocatalytic properties of samples were investigated using cyclic voltammetry. The better electroactivity performance was achieved for the lower calcined electrode.Item EFFECTIVE SYNTHESIS OF SUBSTITUTED QUINOXALINONES AND THEIR COMPLEXATION(university of eloued جامعة الوادي, 2019-06-01) N., Bayou-Khier1; N., Benchikha3,; , . Amari2, M.; M., Hammadi1The objective of this work is the synthesis and complexation of heterocycles under simple reaction conditions. We performed an effective synthesis of substituted quinoxalinones followed by a complexation with transition metals in 1/1 ratio in ethanol. The products obtained were characterized by 1H NMR, 13C NMR, mass spectrometry and IRItem EXPERIMENTAL INVESTIGATION AND MODELING OF THE ELECTRIC FIELD DISTRIBUTION IN LIGHTNING PROTECTION SYSTEM(university of eloued جامعة الوادي, 2019-06-01) A., . Khechekhouche*; T., Guia,; A., HimaThe study presented in this paper highlights the electric field distribution of mutually horizontal and vertical lightning conductors with discontinuous earth. The conductors may be located in both higher or lower earth part. The electric field distribution was resolved in the case of lightning conductor placed between the high voltage rod and the discontinuity (interface). For this aim, we have used different results obtained by a numerical method for computation and an experimental model tested the efficacy of the finite elements methods (FEM). In some configurations the electric field distribution on the plan are less significant than definite by the electro-geometrical configuration. We suggested that effect to the grand field strength at the discontinuity part, which decrease the lightning conductor capture consequence. The results of this study are in harmony with the study relating to the electrical stress of such air gaps devoid of lightningItem EXPERIMENTAL STUDY OF RHEOLOGICAL PROPERTIES OF VISCOELASTIC FLUIDS(university of eloued جامعة الوادي, 2019-06-01) S., .Youcefi1,; A., Youcefi2The rheological analysis of the polymer solutions is studied experimentally using a cone-plate rheometer. The rheograms obtained for various forms of stress show that these solutions have a non-Newtonian character very marked and their behavior is perfectly marked by a rheological model type Ostwald de Waele or power- law. The evolution of the rheological characteristics of these solutions is studied as a function of the temperature, concentration and the age of the organic solute. Detailed analysis of the relationships governing this development highlights the emergence of simple correlations between consistency and behavior index generally are considered independentItem EXTRACTION OF ANTIOXIDANT PHENOLIC COMPOUNDS FROM ALGERIAN INULA VISCOSA LEAVES: INFLUENCE OF THE HARVEST PERIOD AND OPTIMIZATION(university of eloued جامعة الوادي, 2019-06-01) S., Amrouche*; F., Mohellebi,; R., . DerricheThe aqueous extraction of polyphenols from Inula viscoa leaves was carried out on two different lots in order to study the influence of the picking period on the phenolic content and on the antioxidant characteristics of the extracts obtained, as well as on the optimization of technological parameters. For the two lots studied, the simple effect of temperature, the solid to liquid ratio and the interaction effect between temperature and solid to liquid ratio are the most influential parameters on all recorded responses. The phenological cycle of the plant affects the amount of phenolic compounds recovered, as well as the antiradical power and the antioxidant characteristics. The multi-response optimization of the extraction conditions gives polyphenol contents of 291 and 251 mg GAE. g-1 DW and antiradical activities of 90 and 89% for the purified extracts of July and December, respectively.