JFAS_Vol 12 N 01
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Item SYNTHESIS AND CHARACTERIZATION OF THE CHARGE TRANSFER COMPLEXES POLYVINYL CARBAZOLE WITH TRINITROFLUORENONE(university of eloued جامعة الوادي, 2020-01-01) B., Sakki1,; , Bouras3, O.; A., Haouam1Carbazole based polymers are materials of considerable scientific and industrial interest due to their attractive features, such as hole-transporting, high charge-carrier mobility, and electroluminescent properties. Poly (N-vinyl carbazole) (PVK) is easily synthesized, soluble in common organic solvents, poly (N-vinyl carbazole)/2,4,7-trinitro-9-fluorenone (PVK/TNF) charge transfer complex is one of the best-known organic photos conducting materials for application in electrophotography. In the present research, a spectrophotometric method applied for the study of (colored charge transfer complexes) CTC of PVK with TNF reveals the formation of 1:1 (A:D) complex, the formation of CTC with PVK and TNF from the conductivity of the CT Complex. The concentration of the donor is affected when it reacts with the acceptor and that when we increase the concentration of the donor.Item STUDY OF THE INFLUENCE OF SOLVENTS ON THE POLYPHENOLS CONTENT OF SALVIA OFFICINALIS L EXTRACTS AND THE EFFECT ON ANTIOXIDANT ACTIVITY(university of eloued جامعة الوادي, 2020-01-01) S., Tidjani,; , Adaika, C; S., DjaberAlgerian Salvia Officinalis L aerial parts were extracted with pure solvents in increasing polarity (hexane, acetone, methanol and 80% aqueous methanol. All extracts were examined by assessing their content in polyphenols and the antioxidant levels were evaluated by two in vitro tests using spectroscopic and the voltametric methods. The quantitative assessment of total phenols and flavonoids by the colorimetric method make it clear that the extracts are very rich of these compounds. The hydro-methanol and methanol extracts gave the highest DPPH and .− 2 O radicals scavenging activities (12.15 μg/ml) and (0.704 mg/ml) respectively.Item PRODUCER GAS PRODUCTION FROM AN UPDRAFT GASIFIER STOVE USING GOLDEN SHOWER TREE WOODY AND CHARCOAL BIOMASS AS FUEL(university of eloued جامعة الوادي, 2020-01-01) K., SookramoonThis paper presents producer gas production from an updraft gasifier stove with the size of 33.5cm width×83.5 cm height and the chamber volume of 0.052 m3 using Golden shower tree woody and charcoal biomass as fuel. The Golden shower tree biomass (4×2×2 cm size) were burdened at the top of the stove and the generated fuel gas flows through the pipe and passed through the filter and go into the cyclone due to remove of dust and tar. Producer gas consisting of CO, H2, CO2, CH4. The results of the test indicated that fuel gas-producing from burning 7 kg of Golden shower chips at the air flow rate of 9.52×10-3 m3/s the water absorbed 753.159 kJ heat and the temperature in the combustion zone was 824.6 C. By using 7 kg charcoal as a fuel, at the same air flow rate, the water absorbed 672.115 kJ heat, the temperature in the combustion zone was 761.51 C within 14 minutes.Item PHYTOCHEMICAL ANALYSES AND ANTIOXIDANT ACTIVITY OF AERVA JAVANICA (BURM. F.) JUSS. Ex SCHULT(university of eloued جامعة الوادي, 2020-01-01) L., . Alloui,; Z., Rahmani,; M., . Dekmouche ,; D., DjemouiThis paper tuckels the phytochemical analysis of the Aerva javanica which has revealed that the plant contains various chemicals as flavonoids, tannins, alkaloids, saponins and phenols. This study was carried out to evaluate the amount of flavonoids and phenols stored inside of the pedicel and petals using the following solvents chloroform, ethyl acetate and n-butanol which resulted in six extracts. Highest phenolic content (100.82±1.47 mg GAE /g extract) for ethyl acetate stems extracts, while highest flavonoid content (101.46±0.09 mg QE /g extract) for chloroform flowers extracts. The antioxidant activity was investigated using the DPPH profound rummaging activity and phosphomolybdenum tests. It also includes how the combination of both the total phenolic contents and total flavonoids achieved the major results. Chloroform petals extracts had the highest chemical group scavenging activity byIC50 of 0.1035±0.03mg/ml. In addition, the phosphomolybdenum has achieved the highest result (67.72 mM) for n-butanol compared to the other solvents. The chemicals extracted from the Aerva javanica (Burm. f.) portray a postive antioxidant activityItem PESTICIDE OCCURRENCE AND DISTRIBUTION IN CULTIVATED SOILS OF THE ARID REGION OF EL-HEJERA, OUARGLA PROVINCE AND CORRELATION WITH SOIL PROPERTIES(university of eloued جامعة الوادي, 2020-01-01) N., Aloui1,2,; H. *, Ouled-Haddar3*,; *, . Bissati4, S.; M., Kraimat1,5; , . Omeiri5 N.This study deals with the assessment of the most used pesticides by farmers in the Saharan region of Ouargla. Based on collected survey data, sampling of the cultivated soils, physicochemical analysis, solid/liquid extraction and identification by thin layer chromatography and high performance liquid chromatography, the following results were obtained: pesticides used in 2015 are not existing in the extracts, like the case of vapcomic (abamectin 1.8% EC) and Metronate (methomyle 25%), this could be explained by the retention which is the overall result of a set of elementary processes, involving interactions with organic constituents and soil minerals. Also, pesticide residues were found outside their points of application, such as Pulsar and Score 250EC, these phenomena can be explained by the local pedo-climatic conditions and to difference in solubility and chemical nature.Item PALYNOLOGICAL STUDY OF ANGIOSPERMS OF ROSTOMID PARK OF TIARET IN ALGERIA(university of eloued جامعة الوادي, 2020-01-01) B., . Maghni1*,; ., Khedim1, R; M., Maatoug1,; , Hellal2 B.The present work consists of a palynological study carried out on 67 species of Rostomid park of Tiaret in Algeria. A classification of the orders according to the number of apertures of their pollens showed that, Monocots mainly present pollen with one aperture. While most of the Eudicots express Triaperturate pollen. The classification of the studied species according to the form and the number of the apertures of their pollen revealed that the species having tricolpate pollen presented 21%, tricolporate 14%, stephanocolpate7%, Triporate 6%, monocolpate 5%, préporate5%, polyad 4%, while species with other pollen morphology (monad monoporate, dicolpate and inaperturate) represent only an insignificant number. The largest spherical pollen diameter is 122 μm and that of iso polar pollen diameters until111.8/116.6μm.Item OPTIMAL DESIGN OF PHAREMACEUTICALS SUPPLY CHAIN(university of eloued جامعة الوادي, 2020-01-01) R., . Boukli-Hacene1,*; , Boudahri2, F.; , Betaouaf H.t is very known that the availability of drugs is the major problem faced by patients. Therefore, this article deals with the optimization of a pharmaceutical supply chain, i.e. we need to reorganize the entire current pharmaceutical network with a main objective of no patient suffers as long as the medicine exists somewhere. Achieving this requires a strategic organization of the geographic network in order to gain a better distribution. It is based on the information that must be received after a general study on the entire health sector in a specific area. The problem is formulated in a nonlinear model (MINLP) and in order to solve it we resort to using optimization solvers to show the effectiveness of this approachItem NONLINEAR PI CONTROLLER FOR THE CONTROL OF ELECTRIC VEHICLE WITH TWO-MOTOR-WHEEL DRIVE(university of eloued جامعة الوادي, 2020-01-01) A., . Laguidi1,*; A., . Alalei1In this work we proposed a nonlinear PI (NLPI) controllerof the electric vehicle with two motor wheel drives. This proposed combine controller has significantly improved control performance compared to conventional linear fixed-gain PI controller. The different speeds of the wheels are ensured by the electronic differential, this driving process makes it possible to direct each driving wheel to any curve separately. Modeling and simulation are performed using the Matlab / Simulink tool to study the performance of the proposed controller.Item INHIBITORY ACTIVITY, REDUCING LOSS AND REPULSIVE OF METHANOLIC EXTRACTS FROM SHEETS OF PLECTRANTHUS GLANDULOSUS AGAINST SITOPHILUS ZEAMAIS(university of eloued جامعة الوادي, 2020-01-01) T., Dessenbe1,; C. L, Haouvang1,2,; N., Nukenine Elias1The extracts of the leaves of Plectranthus glandulosus were evaluated on population growth, the losses caused to the seeds by Sitophilus zeamais and their repulsive effect were also tested. The reference insecticide Delvap Super® (Dichlorvos 1%, Cypermethrin 0.36% [PI]) was applied as a positive control at the recommended dose (0.1 g / kg), while the extracts were used at four different doses (5, 10, 20 and 40 g / kg). The growth rate of S. zeamais and the losses caused to the seeds were recorded. The methanolic extracts of the leaves of P. glandulosus significantly reduced the growth of of S. zeamais from 61.67 to 100% and the losses from 84.12 to 100% comparable to the inhibitory and reducing effect of the losses of Delvap Super® 100% saved with its recommended dose. The maximum repulsion rate (83.33%) for S. zeamais was recorded with the highest dose (40 g / kg) after 2 hours of exposure by the olfactometer method. In view of these results, we could affirm that these extracts could be recommended as alternatives to synthetic insecticides against S. zeamais in storage.Item IMPROVEMENT IN SPEED PERFORMANCE OF AN INDUCTION MOTOR WITH SLIDING MODE CONTROLLER AND ANN FOR DTC(university of eloued جامعة الوادي, 2020-01-01) Y., Bekakra*1,; D., Ben Attous2,; Z., Tir3,; O., MalikTo further improve the dynamic speed control performance of an induction motor (IM) using a controller based on sliding mode control (SMC) strategy, the switching table for direct torque control (DTC) is realized using a feed forward artificial neural network (ANN). The proposed feed-forward ANN consists of three layers: input, hidden and output layer. The input layer consists of three neurons (sector of flux vector, electromagnetic torque error and stator flux error), the hidden layer consists of a number of neurons that can be determined by experiment to obtain good results. The output layer consists of three neurons (three signals of the converter Sa, Sb and Sc). Simulation results under MATLAB environment are presented and compared with classical DTC using an Integral-proportional (IP) controller to verify the proposed approach.Item HYDROCHEMICAL STUDY OF SOURCES SALINITY IN SHALLOW WATER SPRINGS OF NORTHERN ALGERIAN SAHARA(university of eloued جامعة الوادي, 2020-01-01) O., Melouah1*; H., . Zerrouki1This study is conducted in The Guerrara Oasis; suffer from high salinity of alluvial aquifer used in drinking and irrigation, the distribution of the drilled wells in the study area is anarchic and water salinity is a subsisting problem all along the year, To evaluate the problem gravity two hydrochemical campaigns are acquired during wet and dry seasons , the results confirms the presence of saliferous bodies affecting water quality, The order of abundance of the ions in the ground water samples is Cl->Na+>SO4 ->Mg2+>Ca2+>HCO3 ->K+ the piper diagram reveals that’s the ground water is Cl- - SO4 - and mixed Cl- - Na+ indicating a evaporitic hydro-chemical type, Multiariate statistics and special geochimestry diagrams are used to evaluate the chemical process responsible in groundwater salinization.Item EXTRUDED POLY(ETHYLENE–CO–VINYL ALCOHOL) COMPOSITE FILMS REINFORCED WITH CELLULOSIC FIBERS ISOLATED FROM TWO LOCAL ABUNDONATES PLANTS(university of eloued جامعة الوادي, 2020-01-01) L., Benchikh1*,; A., Merzouki1,; Y., . Grohens2; I., . Pellin2El Diss and El Retma fibers are in abundance in North Africa, collected from Setif (Algeria) and have been treated to isolate cellulose fibers with toluene-ethanol and HNO3 to improve their dispersion into EVOH matrix. SEM micrographs and FTIR analyses of the treated fibers confirmed the elimination of non cellulosics materials and thier cristallinity was estimated by DRX. Thermal analyses by TGA indicate a slight improvement compared to the raw fibers. Composites were also prepared by incorporation of the cellulosic fibers in EVOH matrix. FTIR results and water absorption behavior indicate a reaction between the treated fiber and EVOH matrix by forming hydrogen bonds. Thermal properties of the composites reported by DSC results decreased compared to neat EVOH. The addition of cellulosic fibers led to an increase in the loss and storage modulus and melt viscosity of the composites.Item EXPERIMENTAL INVESTIGATION OF HYGROTHERMAL BEHAVIOR OF DIRECT GREEN FACADES UNDER SEMI-ARID CLIMATE(university of eloued جامعة الوادي, 2020-01-01) K., Benhalilou1,2*,; S, . Abdou2,; , . Djedjig3 R.This paper aims to investigate the hygrothermal behavior of direct green facades and assess their efficiency under semi-arid climate. For that purpose, a comparative study was conducted in three buildings; two buildings with direct green façades (covered with deciduous climbing plants) and one with a bare façade. Air and surface temperature, relative humidity and wind speed were collected in situ and several factors were taken into consideration as thickness and density of plant cover. The analysis of measurement data revealed that direct green façades contribute to improve the outdoor and indoor thermal environment of buildings due to the effect of shading and evapotranspiration. Moreover, the different types of green façades illustrated their different heat impact on the thermal environment of buildings depending on the density and thickness of the plant layer and the covering ratio.Item ELABORATION AND CHARACTERIZATION OF NANOCRYSTALLINE CADMIUM OXIDE FILMS(university of eloued جامعة الوادي, 2020-01-01) H., Benattou,; N., . Benaramdane,; , . Bouzidi* A.Cadmium oxide in thin film was deposited on glass substrates by spray pyrolysis technique from aqueous solution of cadmium nitrate. The diagrams of X-ray diffraction show that the films are polycrystalline. Morphological study shows uniform deposited film and submicron sized grains growth perpendicularly on substrate surface. Optical gap energy of cadmium oxide was estimated to be 2.15eV. Optical study shows that CdO film transmitted in visible and in the near red infrared wavelength range. The conductivity study indicates a semiconducting behavior of cadmium oxide in thin films. Dielectric response of cadmium oxide films was interpreted by orientation and space charge polarization.Item EFFECT OF WATER STRESS ON RHIZOBIA SYMBIOSIS IN ALFALFA (MEDICAGO SATIVA L.)(university of eloued جامعة الوادي, 2020-01-01) A., Mouffok1*,.; M., . Belhamra2The objective of this work was to highlight the responses to the low, moderate and severe water deficit of five varieties of alfalfa. The mechanisms studied focused on the relative water content, dry matter yield and symbiotic nitrogen fixation. The results obtained showed that the effects of water stress are manifested by a decrease in the relative water content and negatively affect vegetative growth as well as the symbiotic nitrogen fixation. The varieties studied behave differently depending on the severity of stress. However, the Diamant and Baldia varieties proved the most tolerant to the different degrees of water deficit. On the other hand, the varieties Dista and Moapa showed a significant sensitivity to the lack of water. This study could be used to define relevant criteria for drought resistance that can be used in varietal selection.Item EFFECT OF THE PHOTOVOLTAIC MODULE TYPE ON THE PERFORMANCE OF AN ARDUINO (I-V) ACQUISITION DEVICE(university of eloued جامعة الوادي, 2020-01-01) M. A., Ouaridhene1*,; A., . Benmoussat1,; , Lasker3, B; , . Benatallah3 M.The demand increase for the energy and the world’s challenge to decrease the consummation of fossil fuels has oriented many research works toward the development and investigation in the renewable energy sources (RES) like solar energy. In fact, an adequate parametrisation of the performance of photovoltaic (PV) modules starts by their characterisation. In this study we focus on measuring the current-voltage (I-V) and power-voltage (P-V) curves for two types of PV modules – Monocrystalline and Amorphous that were tested under different temperature. A developed low-cost acquisition device based on Arduino board is used to monitor and trace those data. The performance and the quality of this later is analysed in term of solar panel characteristics and show that the developed acquisition device is especially suitable for amorphous (PV) modules.Item DRUG LIKNESS FILTERS AND QSAR ANALYSIS OF CAMPHOR-BASED DIIMINES DERIVATIVES AS ANTIVIRAL AGENTS(university of eloued جامعة الوادي, 2020-01-01) W., Hamzi1,2; S., Belaidi3,*,; O., Oukil2,; N., Aoumeur2, 2; , . Medjahed2 SIn the present study, Quantitative structure–activity relationship (QSAR) study has been applied on twenty-five molecules of camphor-based symmetric diimines. A Multiple Linear Regression (MLR) procedure was used to correlate the relationships between molecular descriptors and the biological activity of camphor-based symmetric diimine derivatives. The predictivity of the model was estimated by cross-validation with the leave-one-out method. Our results suggest a QSAR model based on the following descriptors: MW, HE, Pol, MR, MV, HBA, NRB, PSA, μ and Etotal, for the influenza virus reproduction inhibition to confirm the predictive power of the models. High correlation between experimental and predicted activities was observed, indicating good quality of the QSAR model.Item DIVERSITY AND DISTRIBUTION OF THE HYMENOPTEROFAUNA IN NORTHERN AND WESTERN ALGERIA(university of eloued جامعة الوادي, 2020-01-01) F., Marniche2The study of the Hymenoptera fauna associated with the Fabaceae is carried out in different environments in the Northern and Western Algeria. Insect sampling was carried out at seven sites representing three regions with different ecosystems and bioclimatic stages, namely: Algiers, Boumerdes and Tissemssilt. The results obtained show a total of 1022 individuals captured representing 59 taxa, distributed in 46 genera and 18 families. Qualitatively, the Boumerdes region is the richest with 648 individuals; it is followed by that of Algiers then Tissemssilt with respectively 191 and 181. In most of the stations, the dominant family in terms of individuals is that of Apidae whose the rate exceeds 60%. The honey bee Apis mellifera intermissa has a remarkable relative abundance varying between 50% and 89%.Item DISCRETE WAVELET ANALYSIS FOR STATOR FAULTS DETECTION IN INDUCTION MACHINE(university of eloued جامعة الوادي, 2020-01-01) R., Kechida1,; , . Menacer 2 A.The induction motors are not always operating under complete steady state conditions, therefore prompting the development of non-stationary techniques for fault detection. In this paper an inter-turn short circuit fault is considered in the stator winding. The technique for diagnosis in transient state, especially in startup state is based from using the DWT. The signal used for the fault detection is the stator current. The experimental results show that using DWT can effectively be used to diagnose this type of the fault in the motor.Item DEGRADATION OF METHYLENE BLUE USING ZNO PHOTOCATALYST FOR WATER PURIFICATION(university of eloued جامعة الوادي, 2020-01-01) M, Bouchaour*1.; SA, Benyelles1,; D, Guettaia2,; , . OuldAbbas1, A.; N-E., ChabaneSari1Current environmental protection concerns the quality of water and air. This strong tendency to want to control the purity of the water leads to the design of sensors. In this work, we study the degradation of methylene blue in the presence of the ZnOphotocatalyst. The photochemical behavior of this molecule depends a lot on the conditions and the nature of the reaction medium; especially the pH of the solution to be degraded and the concentration of the pollutant. We apply the photocatalysis of the dye (at room temperature) under visible light and using a UV lamp. The photocatalytic efficiency was calculated from absorption spectra using UV-visible spectroscopy.