Vol 08, N 02
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Item A Strategy To Improve The Quality Of The Electric Power Produced By A Wind Turbine Under Variable Speed Using A Proportional Resonant Controller(University of Eloued جامعة الوادي, 2016-05-01) Menga, F. D.; Djongyang, N.; Raïdandi, D.; Tchinda, R.; Zaatri, A.The wind power is well adapted nowadays as solution to the production of electricity or for mechanical use. But wind is a very fluctuating source of energy; it generates a non-permanent and variable power to the loads. This paper presents a strategy to improve the quality of the electric power produced by a wind turbine under variable speed. The mathematical modeling of the various elements of the conversion system is performed. Two control strategies are developed to improve the quality of the energy produced by the wind turbine. The first consists to a judicious management of the DC bus and the second to control the inverters with a corrective proportional resonant. The results obtained after implementation and simulation under Matlab/Simulink platform are presented.Item Physico-chemical Assessment Of Pomace Exhausted And Appreciation Of Their Compostability In The Delegation Of Kalaa Kebira (tunisia)(University of Eloued جامعة الوادي, 2016-05-01) M’sadak, Y.; Makhlouf, M.; El Amrouni, S.Olive pomace is the solid by-product obtained from the extraction of olive oil revealing serious environmental problems in all Mediterranean countries olive growing. Generally, that pomace can be valued, among others, as a source of organic matter (composting). In this perspective, we have addressed in this work to the quantitive and qualitative characterization (limited to certain physico-chemical parameters) of the solid by-product of olive oil extraction in the delegation of Kalaa Kebira (Sousse, Tunisia) while appreciating their compostability. The results showed that those olive residues are essentially dry, carbon-rich and CF, low in nitrogen. They can be used as compost by combining them with other available sources of plant originand/or animal such as manure of cattle, sheep or poultry (in varying proportions and responsible of the nature very heterogeneous and the variable quality) that can be applied to improve soil fertility and crop productivity.Item Evaluation Of Antioxidant Activity And Polyphenolic Contents Of Two South Algerian Eggplants Cultivars(University of Eloued جامعة الوادي, 2016-05-01) Djouadi, A.; Lanez, T.; Boubekri, C.Polyphenolic compounds and antioxidant activity in eggplants (Solanum melongena L.) seem to depend on cultivar, maturity stage, environmental conditions and the part of the fruit. In this work, the polyphenolic content and antioxidant activity of pulp, whole fruit and peel from fresh dark-purple and white eggplant varieties cultivated in Southern Algeria were measured. Total phenolic content were determined by Folin-Ciocalteu test, and antioxidant activity measured using cyclic voltammetry. Correlations between antioxidant activity and total phenolic content were also examined. Within each cultivar, the total phenolic content and antioxidant activity were highest in the peels, followed by the whole fruit and the pulp. In the peel, whole fruit and pulp the dark-purple eggplant had the highest total phenolic contents and the highest total antioxidant activities.Item Mortar Incorporating Supplementary Cementitious Materials: Strength, Isothermal Calorimetry And Acids Attack(University of Eloued جامعة الوادي, 2016-05-01) Senhadji, Y.; Benosman, A.s.; Escadeillas, G.; Mouli, M.; Laoufi, L.; Khelafi, H.Supplementary cementitious materials (SCMs) prove to be effective to meet most of the requirements of durable concrete and leads to a significant reduction in CO2 emissions. This research studies the effect different SCMs (natural pozzolan (PN) / limestone fine (FC) at various replacement levels) on the physical and mechano-chemical resistance of blended mortar. The paper primarily deals with the characteristics of these materials, including heat of hydration, strength and effects of aggressive chemical environments (using sulphuric acid and nitric acid). Over 6 mixes were made and compared to the control mix. Tests were conducted at different ages up to 360 days. The experimental results in general showed that Algerian mineral admixtures (PN/FC) were less vulnerable to nitric and sulphuric acid attack and improved the properties of mortars, but at different rates depending on the quantity of binder.Item The Antibacterial Effect Of Two Medicinal Plants Inula Viscosa, Anacyclus Valentinus (asteraceae) And Their Synergistic Interaction With Antibiotic Drugs(University of Eloued جامعة الوادي, 2016-05-01) Side Larbi, K.; Meddah, B.; Tir Touil Meddah, A.; Sonnet, P.With the emergence of multidrug-resistant organisms, combining medicinal plants with synthetic medicines against resistant bacteria becomes necessary. In this study, Synergism between plants extracts (methanolic extract, essential oils) of Inula viscosa and Anacyclus valentinus and two commonly used antibiotics: gentamycin and oxacillin were investigated on three bacterian strains Escherichia. coli, Bacillus subtilis and Staphylococcus aureus. In the first time, the antibacterial effect of extracts alone was tested against 7 strains by disc diffusion and microdilution methods. The minimum inhibitory concentrations of methanolic extracts ranged between 6.25 and 50mg/ml while that of the essential oils varied between 12.5 and 100µL/mL. The inhibitory concentrations of antibiotics varied between 125 and 31.25 µg/ml. Interactions extracts /antibiotics and extracts/extracts were determined by disc diffusion agar and by checkboard. The results show that the synergistic effect of combinations plant extracts/antibiotics was more important than extracts/extracts.Item The Effect Of High Temperatures On Concrete Incorporating Ultrafine Silica And Polypropylene Fibers(University of Eloued جامعة الوادي, 2016-05-01) Benkaddour, M.; Senhadji, Y.; Kazi Aoual, F.; Semcha, A.In recent years, lots of studies have attempted to examine the possible causes for the thermal instability of ordinary concrete and high performance. However, we still do not know the exact terms of phenomena taking place during exposure to high temperature and the technological solutions that exist (polypropylene fibres, thermal reported) are not always well controlled. In this work, several concrete formulations have been tested and multi-scale observation of high-temperature behavior of ordinary concrete (compressive strength of 48 MPa) and HPC (compressive strength 75 MPa) were adopted. On the scale of the material, the identification of trends with temperature data such as porosity and particularly the mechanical properties allow us to better understand the behaviour of concrete at high temperature differential thermal analysis have been also made.Item Durability Of Natural Pozzolan-based Mortar Exposed To Sulfate Attack(University of Eloued جامعة الوادي, 2016-05-01) Laoufi, L.; Senhadji, Y.; Benazzouk, A.; Langlet, T.; Mouli, M.; Laoufi, I.Cement is a strategic commodity in the civil engineering for the construction of reinforced concrete structures. But its production generates around 5% of toxic gases such as CO2 responsible for environmental degradation. Furthermore, cement industry is a consumer sector of non-renewable energy. The use in the cement of natural additions is a solution to reduce the CO2 gas and the cost of production. The purpose of this work is the study of a sustainable building material: natural pozzolan Beni-saf (PNB) incorporated to mortars exposed to sulfate attack (5% Na2SO4). The loss of mass, monitoring the pH reading of each attack solution as well as specimens dimensions are different tests to study the durability of mortars made with 10, 20 and 30% of natural pozzolan. The result derived from this research is that pozzolan improves mortars resistance to sodium sulfate environment.Item The Study Of Henna Leaves Extract As Green Corrosion Inhibitor For Mild Steel In Acetic Acid(University of Eloued جامعة الوادي, 2016-05-01) Chaudhari, H.g.; Vashi, R.t.The inhibitive action of henna leaves extract on mild steel in acetic acid solution have been investigated by weight-loss, A C impedence and potentiodynamic polarization measurements. The study indicates that as acid concentration increases corrosion rate increases. The corrosion inhibition efficiency increases with increase in concentration of extract. The result obtained revealed that henna leaves extract act as efficient inhibitor. The adsorption of the henna leaves extract obeyed Langmuir adsorption isotherm. The calculated thermodynamic parameters indicated that the adsorption was a spontaneous, exothermic process accompanied by an increase in entropy. Cathodic and anodic polarization curves show that henna leaves extract is a mixed-type inhibitor.Item New Approach To Predict Pressure Produced By Elastic Textile In The Therepeutic Treatment Of Venous Leg(University of Eloued جامعة الوادي, 2016-05-01) Halfaoui, R.; Chemani, B.This paper presents the first theoretical and practical work on compression therapy using the Laplace law to estimate pressures under the bandages. Three woven articles are considered: the first uses a highly-twisted cotton warp yarn, the second a polyamide warp yarn and the third a spandex yarn warped with a cotton yarn. Starting from these woven fabrics, three models, E5, E6 and Ef have been developed with respective elongations of 108 %, 86 % and 92 % and specific mechanical behavior. The results show that than the single layer bandages develop much higher pressure than the multilayer bandages but the multilayer bandages exert much more uniform pressure than single layered bandages. Obtaining uniform pressure along the length of the leg is a positive result in this treatment. Average circumferences of the human body are used for the pressure calculations in four zones: C1, C2, C3 and C4.Item Method Of Assessment The Annual Flow Of The Wadi In The North Of Algeria(University of Eloued جامعة الوادي, 2016-05-01) Ladjel, M.; Mezentseva, O.In arid and semiarid climatic conditions of Northern Algeria surface water resources are limited and irregular in time and space. The water resources of the ephemeral streams (Wadi) are associated with the precipitation and depend on the latitude and altitudinal zonation. Large catchments drained the whole total runoff, which is equal to the difference between precipitation and evaporation. Groundwater runoff of small and medium rivers is proportional to the catchment area; evaporation is influenced by local factors. This paper proposes a new approach to the analysis of the geographical distribution of runoff specifying the vertical and latitudinal zonation of flow and the influence of the basin morphology. The transition from the climatic runoff estimates to the river runoff estimates was made using the Climatic factor of module local runoff, which can be mapped.Item Experimental Validation Of A Dual Loop Control Of Two Phases Interleaved Boost Converter For Fuel Cell Applications(University of Eloued جامعة الوادي, 2016-05-01) Kraa, O.; Ghodbane, H.; Saadi, R.; Ayad, M. y.; Becherif, M.; Bahri, M.; Aboubou, A.In this paper, a modelling, an implementation and a control of a dc-dc converter structure called “two phases Interleaved Boost Converter (IBC)” will be presented. This topology is widely used in order to reduce the input current ripples and the size of passive component with high efficiency. The control of the IBC converter is designed by dual loop control that contains a voltage loop with a linear PI controller and a fast current loop with a non-linear sliding controller to ensure a good tracking in steady state and fast performance in transient state. The proposed control loop has been validated, first by the simulation results under Matlab-Simulink and after by the experimental results using a small-scale test bench with the dSPACE-1104 card.Item Kriging Method Of Study Of The Groundwater Quality Used For Irrigation - Case Of Wadi Djendjen Plain (north-east Algeria)(University of Eloued جامعة الوادي, 2016-05-01) Boufekane, A.; Saighi, O.The groundwater of wadi Djendjen plain (Jijel, North-East Algeria) have always been used as drinking water supply in the cities and the irrigation of agricultural lands. This confers this aquifer, which has already been the subject of numerous hydrogeological studies, a particular interest in terms of qualitative and quantitative monitoring. Its exploitation is today encountering excessive salinity problems, evidenced by measurements of the electrical conductivity of the water and the alkalinisation of soils. This degradation of the environment results, among others, from ion exchange which involves cations (sodium, calcium and magnesium), water / clay interaction as reflected by the sodium absorption ratio (SAR). Analyses on samples of groundwater destined for irrigation and the application of a geostatistical approach have enabled to map the most affected zones by this phenomenon.Item Energy Efficiency Of A Photovoltaic Cell Based Thin Films Czts By Scaps(University of Eloued جامعة الوادي, 2016-05-01) Mebarkia, C.; Dib, D.; Zerfaoui, H.; Belghit, R.In the overall context of the diversification of the use of natural resources, the use of renewable energy including solar photovoltaic has become increasingly indispensable. As such, the development of a new generation of photovoltaic cells based on CuZnSnS4 (CZTS) looks promising. Cu2ZnSnS4 (CZTS) is a new film absorber, with good physical properties (band gap energy 1.4-1.6 eV [01] with a large absorption coefficient over 104 cm-1). Indeed, the performance of these cells exceeded 30% in recent years.In the present paper, our work based on modeling and numerical simulation, we used SCAPS to study the performance of solar cells based on Cu2ZnSnS4 (CZTS) and thus evaluate the electrical efficiency η for typical structures of ZnO / i- ZnO / CdS / CZTS and ITO / ZnO / CdS / CZTS. Furthermore, the influence of the change of CdS by ZnSe buffer layer was treated in this paper.Item Production Of Bioethanol From Agricultural Waste(University of Eloued جامعة الوادي, 2016-05-01) Braide, W.; Kanu, I.a.; Oranusi, U.s.; Adeleye, S.a.This study investigates the potential of ethanol production from agro wastes. Agro waste from sugarcane Saccharum officinarum (sugarcane baggasse, sugarcane bark) and maize plant Zea mays (corncob, corn stalk, corn husk) was subjected to a pretreatment process using acid hydrolysis was applied to remove lignin which acts as physical barrier to cellulolytic enzymes. Ethanolic fermentation was done using Saccharomyces cerevisiae for 5days and the ethanol yield, specific gravity, pH and total reducing sugar were also determined. From the results, the specific gravity, sugar content and pH decreased over time while the Sugarcane baggasse, Sugarcane bark, Cornstalk, Corncob and Cornhusk gave maximum percentage ethanol yield of 6.72, 6.23, 6.17, 4.17 and 3.45 respectively at 72hrs Fermentation. Maximum yields of ethanol were obtained at pH 3.60, 3.82, 4.00, 3.64 and 3.65. These findings show/prove that ethanol can be made from the named agricultural waste and the process is recommended as a means of generating wealth from waste.Item Recovery Of Copper(ii) And Chromium(iii) From Nitrate Medium With Salicylideneaniline Dissolved In 1-octanol(University of Eloued جامعة الوادي, 2016-05-01)The solvent extraction of copper(II) and chromium(III) from nitrate medium with salicylideneaniline (HL) is studied as a function of various parameters: pH, concentration of salicylideneaniline, contact time and the nature of anoin (nitrate and sulfate) in aqueous phase. Chromium(III) is not extracted by salicylideneaniline diluted in 1-octanol. Copper(II) is only extracted by salicylideneaniline and it was found that the highest extractability achieved to 95% at pH 4.9, The stoichiometry of the extracted species was determined by using the method of slope analysis. Elemental analysis, UV–vis and IR-spectra were used to confirm the structure. It is found that the copper (II) is extracted as CuL2.2H2O Their equilibrium constant, distribution coefficient, percentage extraction (%E) and free energy are also calculated.Item Numerical Assessment Of Conventional Regulation Effectiveness For Smoke Removal From A Two Level Underground Station(University of Eloued جامعة الوادي, 2016-05-01) Benkoussas, B.; Djedjig, R.; Vauquelin, O.The effectiveness of an underground smoke control system mainly depends on fire safety engineering that is provided, and which is generally established using smoke spread field and temperature distribution predictions. In the present study, smoke spread and temperature predictions are carried out for a typical two level underground station, under conventional smoke control regulation. The aim is to examine the effectiveness of the conventional regulation and, to look for better smoke control strategies which ensure safe evacuation operations. To this end, an in-depth investigation is carried out on selected ventilation strategies. The calculations are made using FDS code. Results highlight the ineffectiveness of the conventional regulation for some zones of the station and showed irrefutable positive impact of blowing with a moderate flow rate, and the implementation in the vicinity of the stairways of smoke barriers, when smoke control strategy through tunnels is performed.Item A New Analytical Modeling Method For Photovoltaic Solar Cells Based On Derivative Power Function(University of Eloued جامعة الوادي, 2016-05-01) Zieba Falama, R.; Dadjé, A.; Djongyang, N.; Doka, S.y.This paper presents a simple method of optimizing the photovoltaic (PV) generator based on the one diode electrical model. The method consists in solving a second degree equation representing the derivative of the power function. The maximum current and voltage are determined, and the maximum power is deduced. Two popular types of photovoltaic panels constructed with different materials have been considered for the test: the multi-crystalline silicon (Shell S75), and the mono-crystalline silicon (Shell SP70). For various environmental conditions, a comparative study is done between the simulated results and the product manufacturer data. The obtained results prove the efficiency of the proposed method.Item Evaluation Of Physico-chemical Parameters Of Agricultural Soils Irrigated By The Waters Of The Hydrolic Basin Of Sebou River And Their Influences On The Transfer Of Trace Elements Into Sugar Crops (the Case Of Sugar Cane)(University of Eloued جامعة الوادي, 2016-05-01) Benlkhoubi, N.; Saber, S.; Lebkiri, A.; Rifi, El.; Fahime, El.This research was conducted in Kenitra (northwestern Morocco) to determine the physicochemical parameters and metallic concentrations at three levels: surface water of Sebou and Beht intended for irrigation, agricultural soils and sugarcane. The spectrometric analysis of source plasma emission (ICP) has identified eight trace elements contained in the materials taken from zone 1 (As, Cd, Co, Zn, Ni, Pb, Cu and Cr). The obtained results showed that the interaction between the different physicochemical parameters of agricultural soils decides the transfer of the metal elements to the plants. Indeed, for the soil which is used in this agriculture (for sugar cane), its irrigation water, and the contents of Cr, Cd and As exceeds the accepted standards.Item Abscisic Acid Effects On Water And Photosynthetic Characteristics Of Two Ecotypes Of Atriplex Halimus L.(University of Eloued جامعة الوادي, 2016-05-01) Bidai, Y.; Achour, A.; Belkhodja, M.The aim of this study is to compare the water and photosynthetic characteristics of two xerophilic ecotypes of Atriplex halimus (L.). Seeds collected from two different sites Djelfa and Oran are germinated in controlled greenhouse. After 6 months, the plantlets were treated 21 days with increasing concentrations of abscisic acid (0M, 10-6 M and 10-3 M). The results show that ecotype of Djelfa reduced water loss through transpiration because of high stomatal resistance. Consequently the content of chlorophyll a and b decrease significantly compared to Oran ecotype which show an increase of the osmotic potential and relative water content. Osmotic adjustment to reduce dehydration and maintain a good photosynthesis seems efficient in Oran ecotype.Item Interval Type-2 Fuzzy Gain-adaptive Controller Of A Doubly Fed Induction Machine (dfim)(University of Eloued جامعة الوادي, 2016-05-01) Loukal, K.; Benalia, L.This paper presents a comparison between an Interval Type-2 Fuzzy Gain-Adaptive IP (IT2FGAIP) controller and a conventional IP controller used for speed control with a direct stator flux orientation control of a doubly fed induction motor. In particular, the introduction part of the paper presents a Direct Stator Flux Orientation Control (DSFOC), the first part of this paper presents a description of the mathematical model of DFIM, and an adaptive IP controller is proposed for the speed control of DFIM in the presence of the variations parametric, A interval type-2 fuzzy inference system is used to adjust in real-time the controller gains. The obtained results show the efficacy of the proposed method.