JFAS_Vol 11 N 02

Permanent URI for this collectionhttps://archives.univ-eloued.dz/handle/123456789/23349

Browse

Now showing 1 - 20 of 30

COMPARATIVE STUDY AND ANALYSIS OF PERFORMANCE REFRIGERATIONSYSTEMDRIVEN BY DIFFERENT ENERGYSOURCES
(university of eloued -جامعة الوادي, 2019-05-01) Guermit, T; Settou2, N
The present work concerns a study on mechanical compression refrigeration machines thatbased on the electric compressor, and absorption machine, were this work is focused onchoosing natural gas as a direct source in the refrigeration space; this logic was presentgeneral thermodynamic calculations of the two machines. The results show that quite goodvalues of the coefficient of performance of the new configuration of the absorptionrefrigeration machine and the study of the cost of each one, we can consider it encouragingfor the development of this device, which promises to bean alternative one hand to eliminatethe pressure in the electricity sector, and promises to be quite powerful economic and energypointof viewand side environment
COMPUTATION CHEZY’S COEFFICIENT IN A SEMI-ELLIPTICAL PIPE
(university of eloued -جامعة الوادي, 2019-05-01) Beboukha, Y; Lakehal, M; Remaoun, M; Remaoun, M; Achour, B
In the hydraulic field, the Chezy’sflow resistance coefficientin canals and pipes is often chosen arbitrarily. This value is tabulated independently of the depth of the flow or hydraulic radius and even less of the Reynolds number. This coefficient is usually influenced by a number of parameters that mustbedefinedand considered. The objective of this study is to examine, on the one hand, the variation of the Chezy’sflow resistance coefficient for a semi-ellipticalpipe under the hypothesis of an uniform flow with free surface, and to determine on the other hand, the expressions which govern them. Further, it must search expression forChezy’swith consideration of the geometric characteristics of the pipe and hydraulic flow. This study is based on the rough model method (RMM).
COMPUTATIONS OF TURBULENT NON-PREMIXED COMBUSTION AND 3MODELING OF FLAME WALL INTERACTION
(university of eloued -جامعة الوادي, 2019-05-01) Renane, R; Allouche, R; Laazab, S; Nour2, A
The aim of this work is to simulate the thermoelastic behavior of the wall of the combustion chamber 14of the ALLISON-T56 turboprop under the influence of dynamic loads and turbulent diffusion flame. 15This work is presented in two sections: The first step is to simulate and analyze the flame structure 16and determine for given fuel flow and preheating temperature of fresh gas the behavior of the 17thermodynamic parameters of combustion. The numerical approach is based on the resolution of basic 18equations of turbulent combustion using Ansys-Fluent software where the turbulence model 19viscous-SST k-omega is chosen. In the second step, the thermoelastic behavior of the wall of the 20combustion chamber is simulated. The simulation results are presented and discussed in the last 21section.The numerical results is validated by the experimental results realized on the turboprop engine 22Allison-T56 test bench of Air-Algerie Company
CROWD DYNAMICS ANALISYS: SIMULATING HETEREOGENEOUS CROWDS WITH PANIC EFFECT STOCHASTICS BEHAVIOUR
(university of eloued -جامعة الوادي, 2019-05-01) Tan, Z; Othman, W.A.F.W; Wahab, A.A.A; Alhady, S.S.N
In a crowd, where the density might reach one person per square meter and above, the mass of individuals moves in a way that may potentially induce panic amongst individuals, or hazards of personal injuries, from slight to fatal. A computer simulation is implemented and conducted in order to study and analyze the dynamics and behavior of crowds, both at micro- and macro-levels. The simulation is comprised of multiple arenas with different layouts, as well as different compositions of heterogeneous agent behavior. The simulations are observed to conform to established results on a localized scale, and the statistical data shows no significant increase in total evacuation time with increasing composition of non-interactive, path-finding agents amongst flocking agents.
DARK MATTER IN THE CENTRAL REGION OF THE SPIRAL GALAXY NGC4321
(university of eloued -جامعة الوادي, 2019-05-01) Ali, I. A. M; Hwang2, C. -Y; Abidin, Z. Z
We present our results of 12 CO(1-0) transition in the central region of NGC 4321 using the Atacama Large Millimeter and Sub-millimeter Array (ALMA). We found an unaccounted mass of 2.3×109 Mʘ within the central 0.7 kpc of this galaxy. The expected mass of the supermassive black hole (SMBH) in this galaxy is much smaller than the unaccounted mass. The invisible mass is likely caused by dark matter in the central region of the galaxy, indicating a cuspy dark matter profile. We also investigated the Modified Newtonian Dynamics (MOND) as an alternative mechanism to explain the invisible mass. We noted that at the radius of 0.7 kpc of the galaxy, the acceleration is about 1.04×10-7 cm s-2, which is much larger than the critical acceleration a0 ~1.2×10-8 cm s-2 in the MOND theory, suggesting that theory might not be able explain the unseen mass problem in central region of this galaxy
DETERMINATION OF SPONTANEOUS EMISSION RATE AND CARRIER RECOMBINATIONCHANNELS IN GaInAsSb/AlGaAsSbMULTIPLE QUANTUM WELL LASER DIODES EMITTING NEAR 2.3 μm
(university of eloued -جامعة الوادي, 2019-05-01) Gadedjisso-Tossou, K.S; Dzagli, M.M; Mohou, M.A; Rouillard, Y
In this paper, Amplified spontaneous emission spectra is used to extract the gain and internal loss of 2.3 μm narrow ridge-waveguide GaInAsSb-AlGaAsSb quantum well laser diodes by Cassidy’s method. The spontaneous emission intensity was extracted using the average value of the amplified spontaneous emission intensity. The dependence of the integrated spontaneous emission intensity on injection current has been studied. The results show that the current is dominated by radiative recombination at this emission wavelength.
EXPERIMENTAL STUDY OF DUST ACCUMULATION EFFECT ON PHOTOVOLTAIQUE SOLAR MODULE PERFORMANCE IN ZIGUINCHOR, SENEGAL
(university of eloued -جامعة الوادي, 2019-05-01) Sidibba, A; Ndiaye, D; Kobor2, D; Menny3, E
The present work focuses on a study of dust accumulation effect on a photovoltaic solar module performance in the environment of Ziguinchor, Senegal. Two polycrystalline photovoltaic modules 0.75 W were exposed to the outdoor environment on rooftop of the Chemistry and Materials Physics Laboratory (LCPM) at Assane Seck University, Ziguinchor, Senegal (12 ° 34 N, 16 ° 16 E ). The two PV panels were exposed for 70 days to the outdoor environment from March 20, 2018 until May 30, 2018, where, the dusty PV panel was left without cleaning for natural dust accumulation, and the reference PV panel was cleaned daily. The results showed that after 70 days of outdoor exposure without rain, the dust surface density ranged from 0 (g/m2 ) at the beginning to 13.84 (g/m2 ) at the end of the experiment; which resulted in a 92.3 (%) reduction in the reference module efficiency
FRACTURE TOUGHNESS ASSESSMENT OF DEEP WELL ROCK USING CCNBDAND SCB TEST PROTOCOLS
(university of eloued -جامعة الوادي, 2019-05-01) Ghomesheh, P. K; Hosseini, A; Fathi, A
Fracture mechanicsis widely deployedin stone fracture modeling, digging with hydraulic, and dynamic fracture techniquesfor assessing the effects of rock fracture mechanical properties on different hydraulic fracture digging process. To get a better insight aboutthe process, testing the actual rock samples can beextremely imperative. This study, indeed, attempts to evaluate the fracture toughness of actual rock samples using two different test protocols, i.e.,Cracked Chevron Notched Brazilian Disc (CCNBD) and Semi-Circular Bend (SCB). The results indicate thatsimilar behavior is observed for the samples underthe two tests. However,due to the geometry, created crack, and the loading conditions of the prepared samples, the fracture occurs for the SCB samplesunder a less needed force. The results also indicate that the SCB testsamplesyield more fracture toughness
GREEN SYNTHESIS OF IRON NANOPARTICULES USING LEAF EXTRACTFROMPHOENIX DACTYLIFERA. L
(university of eloued -جامعة الوادي, 2019-05-01) Laouini, S.E
In this research paper, the synthesis of ironnanoparticlesby a simple and eco-friendly methodusing extract leaves fromPhoenix DactyliferaL withdifferentconcentration ofFeCl3wasinvestigated. Thenanoparticlessynthesiswere characterizedusing adifferentmethodsUv-Visiblespectrophotometer, infraredspectroscopyandXRD. Thefirstresult was found forthe size ofnanoparticlesandrelationshipwiththeconcentration ofFeCl3, the highconcentration (0.03 M) product the nanoparticleswith size 2.3 nmand thelowconcentrationproduct thenanoparticles with size 22.16 nm. The FTIR analysisconfirmedthe biosynthesisofnanoparticleswith absorption from 500 to 800 cm-1. The crystallinestructureofNPswasconfirmed by X-ray diffraction (XRD) analysis. The antioxidant properties of the obtainedbiomaterial were assessedin vitro, using theDPPH and PPM test.The Fe3O4showed highantioxidant activity againstthemto test. Theresultssuggest thatPhoenix DactyliferaLextractassisted tosynthesisNPs present promising antioxidantcapacityand hence haveanimportant interestinthe development of therapeutic agents against oxidative tissue injuries.
HIGH SENSITIVITY DETECTION OF THE STATOR SHORT-CIRCUIT FAULTS IN INDUCTION MOTOR USING HILBERT PARK’S VECTOR PRODUCT
(university of eloued -جامعة الوادي, 2019-05-01) Allal, A; Chetate, B
In this paper, a new approach for induction motor diagnosis, which called: Hilbert Park’s Vector Product Approach (HPVPA), is proposed, this processes offers unprecedented a high sensitivity in case of stator faults. In order to highlight the effectiveness of this method, this paper included with an important comparison between the proposed method and the proposed techniques in the recently research works; such as: Motor Square Current Signature Analysis (MSCSA), Park's Vector Square Modulus (PVSM), Park’s Vector Product Approach (PVPA), Park-Hilbert “P-H” ( PVSMP-H) and the classical method: Motor Current Signature Analysis (MCSA). The proposed approach bases on three essential steps: firstly, the Hilbert transform of the three phases currents will be aplicated, and then their instantaneous amplitudes will be extracted. Secondly,their current Park's vector components will be reduced. Finally, we apply the mathematical product of its two current Park’s vector components is applicated
IN VITRO AND IN SILICO EVALUATION OF ANTICANCER ACTIVITY OF N,N-DIMETHYLAMINOMETHYLFERROCENE
(university of eloued -جامعة الوادي, 2019-05-01) Adaika, A; Lanez, T; Lanez, E
The aim of this study was to examine the interaction of DNA with the ligand N,N-dimethylaminomethylferrocene(NDF) in buffer phosphate solution(pH = 7.2) by electronic spectroscopy, electrochemical and molecular docking technics. The electrochemical results showed that the binding constant and free binding energy of the adduct DNA-NDF is equal to 1.48×10-4and -23,81 KJ.mol-1respectively. These results were in good agreement with those obtained from electronic spectroscopie assays;furthermore the interaction was also confirmed by the low value of diffusion coefficient of the bounded ligand1.83×10-8cm2.s-1as compared to the free ligand 2.13×10-8cm2.s-1. In addition the in silico study by molecular docking confirms the obtained in vitroresults. Molecular docking further indicated that the ligand is binds to DNA via a hydrogen bond betweenitsnitrogen atom and the oxygen number 4 of the deoxyadenine of the DNA B-chain
INFLUENCE OF ARID CLIMATE ON THE CONTENTOF THE PLANT "CYNODON DACTYLON (L) PERS" IN FLAVONOÏDS
(university of eloued -جامعة الوادي, 2019-05-01) Benzahi, R; Benzahi1, K; Dadamoussa, B; Moussaoui, Y; Labed, B; Mokadem1, K
During its evolution, plants have developed substances (called here active principles) with different functions, this can be a defense against parasitesor other aggressors (micro-organisms), a technique to prevent the growth of other nearby plants and thus ensure good nutrition, as a means of growth or renewal of the species.The concentration of active principlesof a plant varies according to the age of the plant, the season, the climate and the environment in general (drought, pollution, etc).This is why it is important to know the best time of the year, and even of the day (morning, day, evening, night) to harvest the plant.According to our study, it was found that the plant Cynodon dactylon "L" Pers has a differentcomposition and content of flavonoids between two periods.
INVESTIGATION OF THE SURFACE TURKEY MINE WORKERS’ ATTITUDES OF TAKING RISKS
(university of eloued -جامعة الوادي, 2019-05-01) Yilmaz, V; Kirlot, N
The present study is designed to depict the tendency of mine workers to take risks by the help of a structural equation model proposed. For this purpose, a survey consisting of 15 statements was conducted on 150 workers selected randomly from a surface mine. First section of the study is the introduction. Second section gives a literature review. Third section presents the theoretical framework of the structural equation modelling (SEM), and the final section gives the results of the analysis. Results of the analysis indicate that negative affectivity, fatalistic approach and perception of the sufficiency of workplace safety have a significant effect on the tendency of mine workers to take risks. Upon the SEM, the finding that a one unit increase in negativeaffectivity results in an increase of 0.51 unit in the tendency of workers to take risks was found to be noteworthy
INVESTIGATIONS OF THE BINDING PARAMETRES OF THE INTERACTION OF N'-FERROCENYLMETHYL-N'-PHENYLACETO- AND PROPIONOHYDRAZIDE WITH DNA
(university of eloued -جامعة الوادي, 2019-05-01) Mouada, H; Lanez, T; Lanez, E
Herein we describe the determination of binding parameters of the interaction of N'- ferrocenylmethyl-N'-phenylacetohydrazide (FcA) and N'-ferrocenylmethyl-N'-phenylpropionohydrazide (FcP) derivatives with chicken blood double-stranded DNA (cb-ds DNA) in phosphate buffer (PB) solution at physiological pH 7.2 by electronic spectroscopy and molecular docking calculations. The results indicated that both FcA and FcP bind DNA in groove binding mode, values of binding constants and binding free energy obtained from electronic spectroscopy measurements and molecular docking calculations were in good agreement
ISOTOPE SHIFT EFFECTS ON THE GROUND-STATE LEVELS FOR NEUTRAL TIN
(university of eloued -جامعة الوادي, 2019-05-01) Özdemir, L; Şadoğlu, M.S
otope shift effects including mass shift and field shift on the levels for the levels of 3P0,1,2, 1D2and 1S0for the ground-state configuration of the neutral tin (Sn I, Z= 50) have been investigated. In calculations, the multiconfiguration Hartree-Fock method within the frame work of Breit-Pauli Hamiltonian hasbeen used. The calculation of isotope effects for tin hasbeen here performed firstly although there are some works on the atomic structure of tin. The results including isotope shifteffects on the levels havebeen discussed, and new energy values have been compared other available works in literature.
Journal of Fundamental and Applied Sciencesis licensed under aCreative Commons Attribution-NonCommercial 4.0 International License.Libraries Resource Directory. We are listed underResearch Associationscategory.IN VITRO ANTIBACTERIAL ACTIVITY OF CHLOROFORM, ETHYL ACETATE AND BUTANOL EXTRACTS OF LEAVES OF CITRULLUS LANATUS VAR. CRIMSON SWEET GROWN IN THE REGION OF OUARGLA, ALGERIA
(university of eloued -جامعة الوادي, 2019-05-01) Bennouna, A; B, B; Dendougui, H
We are always trying to discover antibiotics, of natural origin, the most effective. For this purpose, our work is devoted to the evaluation of the antibacterial activity of the chloroformic, ethyl acetate and butanolic extracts of the leaves of citrulluslanatuscrimson sweet variety cultivated in the region of Ouargla. This activity was tested against microorganisms derived from the reference strains gram positive (Staphylococcus aureus and Streptococcus sp) and gram negative (Escherichia coli and Pseudomonas aeuruginosa). All extracts showed a remarkable sensitivity against bacteria by giving inhibition diameters varying between 12 and 26 mm. The evaluation of the minimum concentration of inhibition (MIC) led to the valuesbetween 40 and 75 μg/ml. From the results obtained, we can conclude that the leaves of this plant have a good antibacterial activity against certain microorganisms
MOLECULAR DOKING AND ADMET STUDIES OF AMINO-PYRIMIDINE DERIVATIES AS MYCOBACTERIUM TUBERCULOSIS SER/THR PROTEIN KINASES B INHIBITORS
(university of eloued -جامعة الوادي, 2019-05-01) Khamouli1, S; Belaidi, S; Lanez2, T
We used the molecular docking method with Molegro software and we calculate ADME-T properties using Marvin Sketch and preADMET. The 29 amino-pyrimidines ligands were examined for docking studies with PknB (PDB Code: 2FUM).The Moldock score of the best three ligands L9, L12 and L21 are-161.475, -152.003 and-143.359 Kcal/Mol. These percentage shows that these candidature ligands have high binding energy percentage than the native MIX ligand. The ligand L21 has the human intestinal absorption (HIA), Caco-2 cell permeability, and plasma protein binding values of 85.48, 6.312 (nm/Sec.) and 93.097% respectively, which are comparable to MIX and the other ligands L9, L12. This computational study helped to prove that the ligand L21 have the ability to kill the Mycobacterium tuberculosis by inhibiting the expression of protein kinase B.
NALYSIS OF EXTERNAL LOAD RESISTANCE INFLUENCE ON THE SINGLE-CRYSTALLINE SILICON PHOTOVOLTAIC MODULE (PV)
(university of eloued -جامعة الوادي, 2019-05-01) Ouedraogo, A; Guengane, H; Imbga, K. B; Bathiebo, D. J
The solar photovoltaic is the important energy for many countries in Africa nowadays. But the quality of the commercial photovoltaic (PV) module is a real obstruction of progress of this energy despite the large availability of solar radiation. The main purpose of this work is to contribute to the understanding of external load resitance (RL) influence on a comercial PV module. Hence, an experimental study is leaded to evaluate the effects of the RL on the output current, the output voltage, the output electric power, the serie resistance (Rs) and the shunt resistance (Rsh) of a comercial PV module. This study has allowed to observe that the behavior of theses five electrical parameters under real condition. Then, the optimum electric power is obtained for the weak R
NTIOXIDANT, ANTIDIABETIC AND ANTIBACTERIAL ACTIVITIESOF RI C I N U S C O M M U N I S R O O TE X T R A C T S
(university of eloued -جامعة الوادي, 2019-05-01) H u s s a i n, F; A h m e d, F
P r e s e n t st u d y i n v e s t i g a t e d a n t i o x i d a n t , a n t i d i a b e t i c a n d a n t i b a c t e r i a l e f f e c t i v e n e s s o f R i c i n u s c o m m u n i sr o o t.To t a l p h e n o l sc o n t e n t ( T P C ), t o t a l f l a v o n o i dc o n t e n t s( T FC )a n d a n t i o x i d a n t a c t i v i t y we r e d e t e r m i n e d b y fo l i n-ci o c a l t e u r e a g e n tm e t h o d , al u m i n i u mc h l o r i d e c o l o r i m e t r i c t e c h n i q u e a n d 2 , 2-d i p h e n yl l-p i c r yl h yd r a z yl ( D P P H ) s c a v e n gi n g as s a y r e s p e c t i v e l y.A n t ig l yc a t i o n,a l p h a a m yl a s e i n h i b i tion , a n d a n t i b a c t e r i a l an a l ys e s w e r e d o n eb y p r e s c r i b e d p r o c e d u r e s.M e t h a n o l f r a c t i o n h a d s i g n i f i c a n t (P< 0 . 0 5 )T P C ( 9 0± 0 . 1 9m g/ g G A E) a n d T FC ( 3 2 ± 0 . 8 5μ g/ m L CE)a l o n g w i t h si g n i f i c a n t (P< 0 . 0 5 ) a n t i o x i d a n t a c t i v i ti e s( 4 1-4 2 % ) . E x t r a c t s p r e s e n t e d o p t i m a l a n t id i a b e t i ca n d a n t i m i c r o b i a l e f f i c a c i e sv a l i d a t i n gt h e r a p e u t i c p r o p e r t i e s o f R . c o m m u n i sr o o t
NVESTIGATING THE EFFECTS OF HYDRO-ALCOHOLIC EXTRACT OF (PIMPINELLA ANISUM L.) ON HAIR GROWTH
(university of eloued -جامعة الوادي, 2019-05-01) Miri, A; E. Shahraki, E
In this study, the effects of above ground ethanol extracts (Pimpinella anisum L.) wereassessed on hair growth. For this purpose, the prepared extract was treated as a positional solution on mice modified rearheadarea (dorsal) in 2%, 5%, 10% and 20% dosages. At the end of the 10thand 30thdays, hair growth was assessed. The results showed significant differences between all the experimental groups and the control group (p<0.001). In 10% and20% doses, there was Minoxidil effects. Based on these results, anise hydroalcohlic extract had a positive effect on the hair growth which isprobably due to the effects of phytoestrogens in the plant.

Browse

Browsing JFAS_Vol 11 N 02 by Title