Oran, Algeria

University of Oran , or Es Sénia University , is a university located in western Algeria in the wilaya of Oran. It was established in November 1961 as part of the University of Algiers. On April 13, 1965 was made a separate campus, and on December 20, 1967 it became an independent University. It was the first university established after the independence of Algeria.Oran University is one of the most important and largest universities in Algeria. It annually graduates thousands of students in all disciplines from all over Algeria and other Arab and foreign countries. The university also provides scientific and pedagogical supervision to many other universities and university centers in western Algeria. Wikipedia.

Time filter

Source Type

Dellil A.Z.,Oran University of Science and Technology - Mohamed Boudiaf
Mechanika | Year: 2014

This work presents a study of the thermal characteristics of a turbulent flow of a forced convection along various geometrical configurations: Smooth wall, wall corrugated in spiral, corrugated wall. The effects of pitch/diameter ratio and rib height to diameter ratio made it possible to develop this impact of this geometrical form (sometimes corrugated, sometimes spiral) in the intensification of the heat transfer. The physical process of increase in the heat transfer comes owing to the fact that the spiral shape of the tube contributes to break the formed boundary layer and to allow the continual replacement of the fluid meadows of the solid wall. The numerical results obtained prove that this corrugated form or into spiral intensifies the heat transfer thanks to model SST for Reynolds numbers varying from 5000 to 55000, Indeed when the pitch and the depth of the rib increases from P/dh = 0.18, e/dh = 0.02 to P/dh = 0.27, e/dh = 0.06. The ratio of the numbers of Nusselt increases with the rise in the step and the depth of the notch. Several explanations can be advanced, among these last, the spirals are the cause of the presence of the viscous effects, which slow down the flow in the notch of the spiral (broken boundary layer). The low depth of the notch, going from 0.02 up to 0.04 does not allow a significant thermal intensification, on the other hand for the strong values of the notch (0.05 to 0.06) the presence of turbulence supports good Nusselt. We notes that this last increases with the amplitude of the undulation up to the value of 0.05H. Beyond the value of the amplitude, the number of Nusselt tends towards the constant value.

Bourbie D.,Oran University of Science and Technology - Mohamed Boudiaf
Applied Physics Letters | Year: 2011

Recently the change in temperature dependence of conductivity observed in polythiophene field-effect transistors has been attributed to field-induced metal-insulator transition. Under a high source-drain voltage, the conductivity becomes independent from temperature and depends exponentially on the inverse of the square root of electric field. In this paper we present a theoretical interpretation of this behavior in the framework of hopping mechanism. The ingredient of this model, is the energy gained from the electrical field is always larger than the energy difference between the localized states involved into the charge transitions, which induces a crossover from phonon-assisted hopping to field-assisted hopping. © 2011 American Institute of Physics.

Bouchenak M.,Oran University of Science and Technology - Mohamed Boudiaf | Lamri-Senhadji M.,Oran University of Science and Technology - Mohamed Boudiaf
Journal of Medicinal Food | Year: 2013

Legumes (including alfalfa, clover, lupins, green beans and peas, peanuts, soybeans, dry beans, broad beans, dry peas, chickpeas, and lentils) represent an important component of the human diet in several areas of the world, especially in the developing countries, where they complement the lack of proteins from cereals, roots, and tubers. In some regions of the world, legume seeds are the only protein supply in the diet. The health benefits of legume consumption have received rising interest from researchers, and their consumption and production extends worldwide. Among European countries, higher legume consumption is observed around the Mediterranean, with per capita daily consumption between 8 and 23 g, while in Northern Europe, the daily consumption is less than 5 g per capita. The physiological effects of different legumes vary significantly. These differences may result from the polysaccharides composition, in particular, the quantity and variety of dietary fibers and starch, protein make-up, and variability in phytochemical content. The majority of legumes contain phytochemicals: bioactive compounds, including enzyme inhibitors, phytohemagglutinins (lectins), phytoestrogens, oligosaccharides, saponins, and phenolic compounds, which play metabolic roles in humans who frequently consume these foods. Dietary intake of phytochemicals may provide health benefits, protecting against numerous diseases or disorders, such as coronary heart disease, diabetes, high blood pressure and inflammation. The synergistic or antagonistic effects of these phytochemical mixtures from food legumes, their interaction with other components of the diet, and the mechanism of their action have remained a challenge with regard to understanding the role of phytochemicals in health and diseases. Their mitigating effects and the mechanism of their action need to be further addressed if we are to understand the role of phytochemicals in health and diseases. This review provides an overview of the nutritional quality of legumes and their potential contribution in cardiometabolic risk prevention. © Mary Ann Liebert, Inc. and Korean Society of Food Science and Nutrition.

Acimi S.,Oran University of Science and Technology - Mohamed Boudiaf
Scandinavian Journal of Urology and Nephrology | Year: 2011

Objective. The aim of this study was to compare the results of the tubularized incised plate (the Snodgrass technique) and tubularized urethral plate (the Duplay technique) in distal hypospadias repair. Material and methods. Between April 2000 and September 2008, 245 distal hypospadias was corrected by a single surgeon: 132 patients underwent repair by tubularized incised plate and 113 by tubularized urethral plate. The age of the patients ranged from 16 to 48 months (mean 27 months). Results. Mean follow-up was 84 months (21-120 months). With the tubularized incised plate, the meatus was vertically oriented and expanded to the apex of the glans, and the rate of fistulae formation was low (3%) but that of neourethral stenosis was high (22%). The Duplay technique led to fistulae in nine patients (8%) and stenoses in only eight (7%). Conclusions. The tubularized incised plate gave an excellent cosmetic result with fewer fistulae; however, more stenoses occurred than with the tubularized urethral plate technique. © 2011 Informa Healthcare.

Acimi S.,Oran University of Science and Technology - Mohamed Boudiaf
Urology | Year: 2012

Objective: To accurately measure the correction obtained by the release of the skin and dartos fascia and that obtained by mobilization of the urethral plate and resection of the underlying fibrous tissue (according to Koyanagi and Mollard), in the release of chordee. Methods: From February 1996 to February 2011, 234 patients underwent surgery for proximal hypospadias by 1 surgeon. Lateral photographs were taken during successive saline erection tests for 205 patients. The first test was performed at the beginning of the operation, the second test after the release of the skin and dartos fascia, the third test after possible mobilization of the urethral plate and resection of the underlying fibrous tissue, and the last test at the end of surgery. Results: Preservation of the urethral plate was possible in 191 patients (93%). Analysis of the lateral photographs showed that stripping of the penis resulted in complete correction of all chordee <45°. For curvature >90°, stripping of the penis was insufficient in 88% of the cases. However, mobilization of the urethral plate with resection of the underlying fibrous tissue resulted in very low correction (10°-20°), although the blood supply to this plate was preserved. Conclusion: The results of the present study have shown that correction of the curvature that accompanies proximal hypospadias is obtained mainly by release of the skin and dartos fascia. © 2012 Elsevier Inc.

Mortad M.H.,Oran University of Science and Technology - Mohamed Boudiaf
Complex Analysis and Operator Theory | Year: 2012

We present in this paper a new version of the famous Fuglede-Putnam theorem where all the operators involved are unbounded. © 2011 Springer Basel AG.

Mortad M.H.,Oran University of Science and Technology - Mohamed Boudiaf
Complex Analysis and Operator Theory | Year: 2012

The aim of this paper is to give sufficient conditions on two normal operators (bounded or not), defined on a Hilbert space, which make their algebraic sum normal. The results are accompanied by some interesting examples and counter examples. © 2010 Springer Basel AG.

Hakiki N.E.,Oran University of Science and Technology - Mohamed Boudiaf
Journal of Applied Electrochemistry | Year: 2010

The structural and photoelectrochemical characterization of thermally grown oxide films on stainless steel is performed by near field microscopy and photocurrent measurements. The results show that the film formed at highest temperature has a very small grain size with a small surface roughness. A decrease of the grain size with increasing temperature is obtained. The images obtained on oxide formed at low temperature show that the film compactness decreases with temperature especially at 50 °C where the film is partially formed. The results obtained by photocurrent measurements show an increase of the quantum efficiency with temperature. A band gap energy value around 2.3 eV is obtained whatever the nature of the film obtained. Plots of the quantum efficiency as a function of the energy incident light reveal the existence of a photocurrent peak located in the band gap region, at 1.9 eV, near the conduction band. The analysis of the photocurrent as a function of the applied potential reveals a Pool-Frenkel effect. The donor densities extracted from photoelectrochemical measurements are compared to those obtained in previous works by capacitance measurements. The investigation shows that the electronic structure of oxide films formed on stainless steel can be described on the basis of the band structure model developed for crystalline semiconductor materials. © 2009 Springer Science+Business Media B.V.

Hakiki N.E.,Oran University of Science and Technology - Mohamed Boudiaf
Corrosion Science | Year: 2011

A comparative study including structural characterization and semiconducting properties of passive and thermally grown oxides on AISI 304 stainless steel is performed by near field microscopy, Auger electron spectroscopy, capacitance measurements and photoelectrochemistry. This comparative investigation is performed on thermally grown oxides at different temperatures and passive films formed at different potentials. The results obtained by characterization techniques show that the thickness of both oxides increases with increasing formation temperature and potential and allow discussing grain size and surface roughness vs. formation temperature. Capacitance measurements reveal semiconducting behavior of both iron and chromium oxides constituting whole passive and thermal oxides. These results allow extracting and discussing space charge layer thickness and doping densities of iron and chromium oxides in relation with formation conditions. The photocurrent results show a variation of the quantum efficiency with formation temperature and potential and a constant band gap value whatever the nature of the considered film. The variation of the quantum efficiency with applied potential in accordance with Pool-Frenkel model allow extracting and comparing donor densities with those obtained by capacitance measurements. © 2011 Elsevier Ltd.

Chen C.-S.,National Center for Theoretical science | Chen C.-S.,National Tsing Hua University | McDonald K.L.,University of Sydney | Nasri S.,United Arab Emirates University | Nasri S.,Oran University of Science and Technology - Mohamed Boudiaf
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We study a class of three-loop models for neutrino mass in which dark matter plays a key role in enabling the mass diagram. The simplest models in this class have Majorana dark matter and include the proposal of Krauss, Nasri and Trodden; we identify the remaining related models, including the viable colored variants. The next-to-simplest models use either more multiplets and/or a slight modification of the loop-diagram, and predict inert N-tuplet scalar dark matter. © 2014 Elsevier B.V.

Loading Oran University of Science and Technology - Mohamed Boudiaf collaborators
Loading Oran University of Science and Technology - Mohamed Boudiaf collaborators