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Search Results: 1 - 10 of 708 matches for " Meftah Mustapha "
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Investigation of Atmospheric Turbidity at Ghardaïa (Algeria) Using Both Ground Solar Irradiance Measurements and Space Data  [PDF]
Djafer Djelloul, Irbah Abdanour, Keckhut Philippe, Zaiani Mohamed, Meftah Mustapha
Atmospheric and Climate Sciences (ACS) , 2019, DOI: 10.4236/acs.2019.91008
Abstract: Four radiometric models are compared to study the Angstr?m turbidity coefficient \"\" over Gharda?a (Algeria). Five years of global irradiance measurements and space data recorded with MODIS are used to estimate \"\". The models are referenced as \"\" for Dogniaux’s method, \"\" for Louche’s method, \"\" for Pinazo’s method, \"\" for Gueymard’s method and by \"\" for MODIS data. The results showed that \"\" and \"\" are very close as the couple \"\" and \"\". \"\" values are between them. Results showed also that all Angstr?m coefficient curves have the same annual trend with maximum and minimum values respectively in summer and winter months. Annual mean values of \"\" increased from 2005 to 2008 with a slight jump in 2007 except for \"\". The city environment explains it since the urban aerosols predominate over all other types during this period. The jump in 2007 is attributed to the ozone layer thickness that undergoes the same behavior. Some models are then more sensitive to this atmospheric component than others. The occurrence frequency distribution showed that \"\", \"\" , \"\" ,
Infection par le Virus du Papillome Humain et le cancer du col de l’utérus
Ennaji My Mustapha,Meryem Meftah El khair
Technologies de Laboratoire , 2008,
Abstract: Au plan mondial, le cancer du col de l’utérus est responsable d’environ 230 000 décès et 500 000 nouveaux cas par an (80% dans les pays en développement) d’après le Centre International de Recherche sur le Cancer de l’OMS.Après le cancer du sein, le cancer du col de l’utérus représente le deuxième cancer chez la population féminine marocaine et constitue par conséquent un véritable problème de santé publique.De nombreuses études épidémiologiques et moléculaires ont pu mettre en évidence l’association entre le cancer du col utérin et l’infection par le Virus du Papillome Humain (HPV). En effet, ce virus a été retrouvé dans 90 à 100% des lésions précancéreuses et cancéreuses du col utérin. Un vaccin prophylactique qui permettrait de protéger contre les infections à HPV16 et 18, donc de prévenir les 2/3 des cancers du col de l'utérus a été récemment mis sur le marché.
Path Integral Formulation for Ionic Broadening in Plasmas: Lyman-α with Fine Structure and Dynamical Effects  [PDF]
N. Bedida, M. T. Meftah
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.330205
Abstract: Using the path integral formalism, the fine structure and dynamics effects are taken into account for the broadening of spectral lines in a plasma. A compact expression of the dipolar autocorrelation function for an emitter in the plasma is derived for Lyman alpha lines with fine structure. The expression of the dipolar autocorrelation function takes into account the dynamics effects, which are represented by the time microfield autocorrelation function.
Ameliorative Action of Mn-Salen Derivatives on CCl4-Induced Destructive Effects and Lipofuscin-Like Pigment Formation in Rats’ Liver and Brain: Post-Treatment of Young Rats with EUKs  [PDF]
Sakineh Meftah, Razieh Yazdanparast, Mahsa Molaei
CellBio (CellBio) , 2014, DOI: 10.4236/cellbio.2014.33010
Abstract: Lipofuscin-like pigments (LFPs) are highly oxidized cross-linked aggregates of oxidized protein and lipids which are formed under oxidative state conditions by free radicals produced. The present study aimed to evaluate the probable ameliorative effects of some of the Mn-salens namely EUKs 8, 134, 15, 115, 122 and 132 (compounds 1-6) and vitamin C against carbon tetrachloride (CCl4)-induced acute damage on rats’ livers and brains. Exposure to CCl4 is believed to induce oxidative stress and cause tissue damage due to the formation of trichloromethyl (·CCl3) and peroxy trichloromethyl (·OOCCl3) radicals. In this study, 54 rats were randomly divided into 9 groups of six each: normal group received only vehicle (olive oil; 2 ml/kg b.w.) for 6 consecutive days; CCl4- intoxicated group received the vehicle and CCl4 (50% solution of CCl4 in olive oil, 2 ml/kg b.w.) on the first and second days and the vehicle on the third to sixth days; test rats received Mn-salens or vitamin C (20 mg/kg b.w.) and CCl4 (2 ml/kg b.w.) on the first and second days and Mn-salens or vitamin C (20 mg/kg b.w.) on the third to sixth days. Mn-salens administration ameliorated the effects of CCl4 by decreasing the levels of ROS, lipid and protein oxidations and LFPs formation on liver and brain as well as cholesterol and triglycerides, aminotransferases and alkaline phosphatase contents in sera of rats whereas increased the activities of catalase, superoxide dismutase,glutathione reductase, glutathione peroxidase and reduced glutathione in liver and brain tissues. Histopathological studies confirmed the toxic effects of CCl4 and ameliorative action of Mn-salens on tissues. These results suggest that the evaluated EUKs were able to attenuate LFPs accumulation and morphological changes caused by CCl4 in rats and thus, confirming the ameliorative role of Mn-salens against CCl4-induced oxidative damage and age-related diseases.
Feynman Perturbation Series for the Morse Potential  [PDF]
Boudjedaa Badredine, Meftah Mohamed Tayeb, Chetouani Lyazid
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.55028

In this paper we give an alternative treatment of the Schrodinger equation with the Morse potential, which based on the exact summation of the Feynman perturbation series in its original form. Using Fourier transform we establish a recurrence equation between terms of the perturbation series. Finally, by the inverse Fourier transform and some technical tools of the ordinary differential equations of the second order, we can compute the exact sum of the perturbation series which is the Green’s function of the problem.

Geometric Inversion of Two-Dimensional Stokes Flows – Application to the Flow between Parallel Planes  [PDF]
Mustapha Hellou
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.210100
Abstract: Geometric inversion is applied to two-dimensional Stokes flow in view to find new Stokes flow solutions. The principle of this method and the relations between the reference and inverse fluid velocity fields are presented. They are followed by applications to the flow between two parallel plates induced by a rotating or a translating cylinder. Thus hydrodynamic characteristics of flow around circular bodies obtained by inversion of the plates are thus deduced. Typically fluid flow patterns around two circular cylinders in contact placed in the centre of a rotating or a translating circular cylinder are illustrated.
A comparative study on face recognition techniques and neural network
Meftah Ur Rahman
Computer Science , 2012,
Abstract: In modern times, face recognition has become one of the key aspects of computer vision. There are at least two reasons for this trend; the first is the commercial and law enforcement applications, and the second is the availability of feasible technologies after years of research. Due to the very nature of the problem, computer scientists, neuro-scientists and psychologists all share a keen interest in this field. In plain words, it is a computer application for automatically identifying a person from a still image or video frame. One of the ways to accomplish this is by comparing selected features from the image and a facial database. There are hundreds if not thousand factors associated with this. In this paper some of the most common techniques available including applications of neural network in facial recognition are studied and compared with respect to their performance.
Line Shapes in the Magnetized Plasmas  [PDF]
Kamel Touati-Ahmed Touati, Mohammed-Tayeb Meftah
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.39123
Abstract: Till now, the most studies of Lyman alpha line are concerned only by the Stark effect. In our knowledge few investigations are developed for the plasmas subjected to a magnetic field. In this paper we present the combined effect, Stark-Zeeman, on the spectral line shape. The dynamic effects due to the time fluctuation of the electric microfield and the radiation polarization are also taken into account.
Numerical Study of Heat Transfer and Contaminant Transport in an Unsaturated Porous Soil  [PDF]
Abdelhamid Belghit, Mustapha Benyaich
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.613113
Abstract: Penetration of chemicals in the soil ground through irrigation water or rainfall induces important risks for the environment. These risks are badly known and may lead to direct contamination of the environment (atmosphere or ground water) or harmful effects on organisms living at ground level, indirectly affecting men. It is thus necessary to estimate these potential chemical risks on the environment. For that reason, the gradual change of these products (fertilizers, solutions, pollutants, ...) in the ground has been the subject of a lot of recent research works, based in particular on the study of non-saturated porous media in a theoretical, numerical or experimental way. Most of these works are incomplete and, in order to simplify the problem, they don’t take into accounts some process, which may be of prime importance under particular natural conditions. Complexity of such studies results from their multidisciplinary nature. In this communication, we study simultaneous transport of pollutant, the water that provides transport and the heat transfer in a 200 cm long cylindrical column full of sand taken as a non-saturated porous medium. We consider two kinds of conditions on the temperature at the column surface: the case of constant temperature and the case of sinusoidal temperature. We evaluate the influence of this temperature on the transfers. This study is purely numerical. We use the control volume method to determine hydrous, thermal and pollutant concentration profiles.
Phelipanche aegyptiaca Management with Glyphosate in Potato  [PDF]
Mustapha Haidar, Elie Shdeed
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.616256
Abstract: Two years field and greenhouse studies were carried out to evaluate the efficacy of sub-lethal doses of glyphosate (Round upR), ammonia gas, phosphoric acid and sulfuric acid against Phelipanche aegyptiaca in potato. Results showed that sequential application of sub-lethal doses of glyphosate at all tested rates significantly reduced P. aegyptiaca shoot number and shoot dry weight. While, the use of ammonia gas, phosphoric acid and sulfuric acid had no significant effect on the total level of P. aegyptiaca infection as compared to the control. The best results considering both P. aegyptiaca control and selectivity in potato were obtained by sequential application of sub-lethal doses of glyphosate at 60 and 80 g·ai·ha-1. Sequential application of glyphosate at 60 g·ai·ha-1 reduced P. aegyptiaca infection by 100% after 100 days after potato emergence (DAPE). Except for sequential application of glyphosate at 60 and 80 g·ai·ha-1, all tested rates enhanced the maturity rate of potato plants and decreased the number of marketable potato tubers.
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