WEBREVIEW

New exact bound states solutions for (C.F.P.S.) potential in the case of non commutative three dimensional non relativistic quantum mechanics

Abdelmadjid MAIRECHE — 2015-10-06T10:13:37Z

We obtain here the modified bound-states solutions for central fraction power singular potential (C.F.P.S.) in noncommutative 3-dimensional non relativistic quantum mechanics (NC-3D NRQM). It has been observed that the commutative energy spectra was changed, and replaced degenerate new states, depending on four quantum numbers : j, l and s_z=±1/2 corresponding to the two spins states of electron by (up and down) and the deformed Hamiltonian formed by two new operators : the first describes (...)

- Volume 04 / Schrodinger equation, Hydrogen atom, Star product, Noncommutative space, Central fraction power singular potential

Reduction of hot points formation in a heat tube bundle exchanger

Djamel Sahel, KARAS A., Mohamed Bouzit, Warda Boudaoud, Youcef Kamla — 2015-10-06T10:00:00Z

Among the major problems in the use of baffles in heat exchangers is the formation of hot points due to the stagnation of the flow behind baffles. The present work shows a design of a porous space in the baffles in order to shake the dead zones behind these baffles. The numerical investigation is based on the Navier Stocks averaged (RANS) using FLUENT software. The results validated by experimental data from the literature shows that the porous space presented in this paper reduces in an observable manner the hot points and increase the heat transfer rate.

Fatigue life prediction of package of suspension automotive under random vibration based on road roughness

Alireza Arghavan, Kazem Reza Kashyzadeh, Mohammad Jafar Ostad-Ahmad-Ghorabi — 2015-10-06T09:34:10Z

The impact of a suitable suspension system for passenger comfort and vehicle steering is an obvious order and direct impact on the safety of passengers must be considered, to do so different kinds of tests must be exerted, one of these is fatigue testing which is one of the most significant ones. Another issue is the high cost in practical ways, and to cope with this issue various ways must be assessed and analyzed, one of the best and the most efficient ways is modelling and testing in virtual software environments. In the present paper, predict fatigue life of suspension component and package of automotive suspension are the main purposes. First, using MATLAB software, road roughness according to the intercity roads for constant vehicle velocity (100Km/h) has been studied. After that frequency response of components has been analysed, its critical points determined to calculate the fatigue life of the part, and the amount of critical stress obtained based on Von Misses, Tresca and Max Principle criterion for a quarter car model (passive suspension System in 206 Peugeot). Fatigue life of the vehicle components are calculated in terms of kilo-Meters in specialized fatigue software such as 116944, 92638.9, 46388.9 and 191388.9 Km respectively wheel hub, pitman arm, suspension arm and package of suspension. Finally, to prove the given results of the finite element method compared with reported results by other researchers and the results match very well with those.

Product of likelihood ratio scores fusion of dynamic face, text independent speech and on-line signature based biometrics verification application systems

Mohamed Soltane — 2015-10-06T08:58:38Z

In this paper, the use of finite Gaussian mixture modal (GMM) tuned using Expectation Maximization (EM) estimating algorithms for score level data fusion is proposed. Automated biometric systems for human identification measure a « signature » of the human body, compare the resulting characteristic to a database, and render an application dependent decision. These biometric systems for personal authentication and identification are based upon physiological or behavioral features which are (...)

- Volume 04 / Biometry, Multi-Modal, Authentication, Face Recognition, Speaker and Signature Verification, Data Fusion, Adaptive Bayesian decision, GMM, EM, Likelihood Ratio

Electromagnetic characterization and modelling of superconducting material

Bruno Douine, Jean Lévêque — 2015-10-05T08:58:00Z

Electromagnetic characterization and modelling of superconducting material are very important for end users. Firstly main features of superconducting material are presented. Secondly two methods of characterization to obtain experimentally the influence of magnetic field on critical current density JC are presented. These two methods are commonly used for applications in electrical engineering. The electrical method is based on measuring the voltage and current of a superconducting sample. It has the advantage of simplicity in implementation, but the main drawback as the presence of the self magnetic field. This prevents the determination of the parameters of $J_C(B)$ for weak magnetic fields. The magnetic method using the cycle of magnetization has the advantage of making measurements without contact with the sample but has two drawbacks : it is based on a theoretical model in which $J_C$ is constant and the assumption of infinite length sample.

Identification de modèle ARMA à sortie quantifiée par la méthode de maximum de vraisemblances

LATRECHE Boubakeur., MITICHE lahcène. — 2015-04-13T10:21:53Z

Dans cet article nous présentons une étude détaillée sur une méthode d'identification paramétrique de modèle ARMA (Autorégressive à moyenne ajusté) dans le cas ou la sortie est quantifiée, nous allons utiliser la méthode de maximum de vraisemblance récursive pour estimer les paramètres de ce modèle (ARMA). Cette méthode est décompose sur deux partie, l''algorithme d''expectation maximisation qui est connu d''essuyer d''un faible taux de convergence. A cette, l''estimation obtenue après quelques itérations EM (...)

- Volume 03 / Identification, Estimation, Modèle ARMA , Quantification, Maximum de vraisemblance

Analytical evaluation of criticality in RZ9 reactor

DEHIMI Fatima Zohra. , Khadidja MOHAMMED CHERIF., SEGHOUR Abdeslam . — 2015-04-13T09:48:44Z

The diffusion equation is widely used to estimate the reactor properties. In this work, this method is presented to evaluate the e⁄ective multiplication factor of neutrons in Oklo natural nuclear reactors. The results obtained by analysis of the geometric configurations as function of the reactor's dimensions, are compared with those obtained using the Monte Carlo simulation method for the same configurations of Oklo natural nuclear (...)

- Volume 03 / diffusion equation , Oklo , Natural reactor , Monte Carlo

Optimisation des propriétés pharmacologiques des substances naturelles par la méthode numérique Volsurf

2015-04-13T09:34:40Z

L'expérience a montré que le maintien de la richesse de la biodiversité végétale ainsi que la connaissance des thérapeutiques traditionnelles, sont susceptibles de mener à bien la recherche de nouvelles molécules aux activités biologiques. Dans ce contexte nous nous sommes intéressés à étudier de manière approfondie l'extraction et l'identifiication des substances secondaires actives isolées de Centaurea pullata L. (Asteraceae) utilisée en médecine traditionnelle algérienne récoltée à Blida. Après l'identification des différentes substances secondaires (huiles essentielles, flavonoïdes, sesquiterpènes lactones), les substances nouvelles isolée et identifiées ont été investiguées pour leurs pouvoirs antimicrobiens (antibactérien et antifongique) et anticancéreux. Sachant que les propriétés clefs pour la découverte des médicaments sont l'absorption, la distribution, le métabolisme et l'excrétion (ADME), nous avons alors réalisé la prédiction des propriétés pharmacologiques de quelques substances nouvelles via la méthode computationnelle Volsurf.

Assessment of Gravity Anomaly Surfaces (DTU10, EGM2008 and ITG-Goce02) in Western Mediterranean Sea

Hania HACHEMI., Hebib TAIBI., Mahdi HADDAD. — 2015-04-12T15:31:45Z

This paper is concerned with the estimation of the quality of the global free air surfaces anomalies DTU10, EGM2008 and ITG-Goce02 in Western Mediterranean Sea. We performed comparisons between independent in-situ marine gravity measurements (a set of 162374 gravity points supplied by the BGI by the International Gravimetric Bureau - BGI) and those estimated from the three surfaces of free air anomalies. This is done by critically looking of di⁄erences between in-situ measurements and estimated values. However, in-situ marine gravity data are not free from errors. Thus, outlier data detection processes are an essential first step in this statistical analysis. In this regard, five approaches are used to identify outliers in BGI data, namely : the Grubbs Test, Generalized ESD Procedure, Z-scores and its modified version and the Box plot approach. After removing the suspicious data identified by Boxplot testing which seems to be the bests (about 3% of data are rejected), a general result appears over the three set of comparisons. Relative to the marine data, the DTU10 and EGM 2008 o⁄er similar di⁄erences with a standard deviation of 19.5 mgal, while the ITG-Goce02 surface o⁄ers a standard deviation of about 30.5 mgal.

Convection mixte lors de l'écoulement d'un fluide de Bingham au sein d'une conduite cylindrique horizontale

Mansouri A., Meriem AKKAR., Nabila LABSI., Welid BERABOU., Youb Khaled BENKAHLA. — 2015-04-12T15:09:19Z

La présente étude traite du transfert thermique en mode de convection mixte lors de l'écoulement d'un fluide viscoplastique de Bingham au sein d''une conduite cylindrique horizontale à section droite circulaire, maintenue à température constante et uniforme. Le travail numérique, basé sur la méthode des volumes …finis, se focalise sur l''impact de l''intensité des forces de poussée sur le comportement hydrodynamique et thermique de l''écoulement. Les résultats montrent que la structure de l'écoulement se (...)

- Volume 03 / Convection mixte, Méthode des volumes finis, Fluide viscoplastique , Fluide de Bingham , Conduite horizontale