JFAS_Vol 08 N 02

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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.
Study Of An Absorption Machine For An Ammonia-water System Decentralized Trigeneration
(University of Eloued جامعة الوادي, 2016-05-01) Rashidi, A.m.m.; Habibzadeh, B.a.; Rezaie, C.s.s.
This paper deals with Study of an absorption machine for an ammonia-water system decentralized trigeneration. The effects of evaporator, absorber and boiler temperature on the coefficient of performance of this cycle investigate. Simulation results show that with increasing the evaporator and absorber temperature the coefficient of performance increased and decreased, respectively. By increasing boiler temperature the coefficient of performance is constant.
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.
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.
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.
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.
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.
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.
Bacteriological Analysis And Public Perception About Drinking Water Of Boreholes In Arib (ain Defla, Algeria)
(University of Eloued جامعة الوادي, 2016-05-01) Hamaidi-chergui, F.; Brahim Errahmani, M.; Debib, A.; Hamaidi, M.s.
Water from boreholes in Arib (Ain Defla) was investigated to ascertain its quality status and suitability for drinking and domestic uses. Fifty six water samples were collected from four boreholes. The analyses of the Coliform counts obtained from various boreholes samples ranged between 0 and 200 CFU/ 100 ml with regard to total Coliforms and between 0 and 8 CFU/ 100 ml with regard to fecal Coliforms. Three of the boreholes samples showed contamination by Streptococcus sp. Pathogens like Salmonella were not identified but some low levels of sulfite-reducing bacteria was found. The interviews were done to assess perceptions on water taste problems, odour, colour, turbidity and health problems. These results showed that all the samples did not satisfy the WHO and JORA requirements for bacteriological characteristics in human consumption.
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.
Determination Of Characteristics Maximal Runoff Mountain Rivers In Crimea
(University of Eloued جامعة الوادي, 2016-05-01) Ovcharuk, V.; Todorova, O.
This article has been examined maximum runoff of the rivers of the Crimean Mountains. The rivers flow through the western and eastern part of the northern slope Crimean Mountains, and on its southern coast. The largest of them: Belbek, Alma, Salgir, Su-Indol and others. To characterize the maximum runoff of rain floods (the layers of rain floods and maximum discharge of water) on the rivers of the Crimean Mountains were used materials of observations for long-term period (from the beginning of observations to 2010 inclusive) on 54 of streamflow station with using a the so-called «operator» model for maximum runoff formation.
Inverse Correction Of Fourier Transforms For One-dimensional Strongly Scattering Aperiodic Lattices
(University of Eloued جامعة الوادي, 2016-05-01) Ying-Fei, Hsin
The accuracy of the Fourier transform (FT), advantageous for the aperiodic lattice (AL) design, is significantly improved for strongly scattering periodic lattices (PLs) and ALs. The approach is to inversely obtain corrected parameters from an accurate transfer matrix method for the FT. We establish a corrected FT in order to improve the spectral inaccuracy of strongly scattering PLs by redefining wave numbers and reflective intensity. We further correct the FT for strongly scattering ALs by implementing improvements applied to strongly scattering PLs and then making detailed wave number adjustments in the main band spectral region. Silicon lattice simulations are presented
Polypropylene-modified Kaolinite Composites: Effect Of Chemical Modification On Mechanical, Thermal And Morphological Properties
(University of Eloued جامعة الوادي, 2016-05-01) Meziane, O.; Bensedira, A.; Guessoum, M.; Haddaoui, N.
The intercalation of kaolinite with an ammonium salt was performed. Untreated and treated kaolinite samples were examined by X-ray diffraction (XRD). PP/kaolinite compounds were prepared by the melt intercalation method. The effects of modified clay on properties of the prepared composites were studied. The XRD results showed that the treatment with the ammonium salt caused the return to the initial state of the clay. The thermogravimetric analysis thermograms (TGA) marked an increase in thermal degradation of the composites, while the differential scanning calorimetric (DSC) results showed the decrease of the crystallization temperature and the melting point in presence of clay in the matrix owing to the fact that the filler acts as reinforcing effect. The mechanical properties of the composites exhibited important variations, the morphology of the composites was further studied using scanning electron microscopy (SEM) and showed poor dispersion of used nanoclay in PP matrix.
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.
Does Earthworms Density Really Modify Soil's Hydrodynamic Properties In Irrigated Systems With Recycled Water?
(University of Eloued جامعة الوادي, 2016-05-01) Ababsa, N.; Kribaa, M.; Addad, D.; Tamrabet, L.; Baha, M.
Our study has the general objective to understand the impact of the valuation of treated water on earthworm abundance and total porosity of the soil and the effect of the interaction between these two physical-biological components of the hydrological functioning of soils. It was carried out on the meadows soils of the valley of Wadi Bousselam. Although the treated water has high organic and particulate filler, it improved the earthworm abundance, total porosity and hydraulic conductivity of the soil.
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.
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.
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.
Performance Simulation Of Parabolic Trough Solar Collector Using Two Fluids (thermic Oil And Molten Salt)
(University of Eloued جامعة الوادي, 2016-05-01) Boukelia, T.e.; Mecibah, M.s.; Laouafi, A.
The Parabolic trough solar collector is considered as one of the most proven, mature and commercial concentrating solar systems implemented in arid and semi-arid regions for energy production. It focuses sunlight onto a solar receiver by using mirrors and is finally converted to a useful thermal energy by means of a heat transfer fluid. The aims of this study are (i) to develop a new methodology for simulation and performance evaluation of parabolic trough solar collector, in addition (i) to compare the efficiencies of this system using two different fluids; thermic oil and molten solar salt. The validation of obtained results using this methodology shows a good agreement with those obtained by the experimental tests. Furthermore, this study favors the using of thermic oil as heat transfer fluid in the receiver instead of molten salt due to the high efficiency of the concentrator based on the first fluid in comparison to the second one.
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.

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