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Search Results: 1 - 10 of 15304 matches for " Leila Douik El Gharbi "
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Invasive Thymoma with Endobronchial Polypoid Growth  [PDF]
Samira Aouadi, Emna Braham, Ayda Ayadi, Houda Gharsalli, Asma Zidi, Adel Marghli, Sonia Maalej, Leila Douik El Gharbi
Open Journal of Respiratory Diseases (OJRD) , 2015, DOI: 10.4236/ojrd.2015.54008
Abstract: Thymomas are the most common neoplasms of the mediastinum. It is common that thymoma invades neighboring structures in the thorax, but direct polypoid tumor growth into the airway is extremely rare. We report a rare case of invasive thymoma with polypoid endobronchial growth in a 66-year-old woman. Computed tomography demonstrated an anterior mediastinal tumor which extended into the right upper lobe. Endoscopic examination revealed a polypoid tumor which occluded the right upper bronchus. A biopsy specimen obtained from the intraluminal mass was very suggestive of thymoma. The patient had no parathymic syndrome. The tumor was resected with the right upper lobe. The final post-operative tissue findings confirmed a type B2 thymoma of the World Health Organisation classification.
Conditions de compétitivité des semences de pomme de terre produites en Tunisie
Gharbi FR.,El Fahem M.
Biotechnologie, Agronomie, Société et Environnement , 2004,
Abstract: Competitiveness conditions of seed potato production in Tunisia. This work is an economic survey of the potato seed production in Tunisia from imported Elite class. Potato seed production in the studied regions ensures an average gross margin of 1717 Tunisian Dinars (TND)/ha and an average profit of 825 TND/ha for an average yield of 19 t/ha. Average production cost is estimated to be around 296 TND/t. The cost price of the produced seed after storage depends among others on the status of the stoker (Groupement Interprofessionnel des Légumes GIL, or private), the selling price, storage cost and the crop season (rear season, primer or season). Storage cost is the main component of seed costs for the cropping season. Under present prices and production techniques, price of imported potato seeds is more competitive compared to that of the seeds produced in Tunisia for season crops whether it is for the case of a professional organism GILor for season and primer crop in the case of private producers. Privatisation of potato seed production is therefore not envisageable.
Perspectives de production des semences de pomme de terre à partir de vitropropagation en Tunisie
Faten Rejeb Gharbi,Mohamed El Fahem
Biotechnologie, Agronomie, Société et Environnement , 2007,
Abstract: Prospects of the potato seed production from vitropropagation in Tunisia. The profitability of seed potato production in Tunisia has been evaluated at five different stages, as following: stage 1: in-vitro-propagation of plants. Stage 2: minitubers production under insect-proof greenhouse. The three other steps, are done in the field by successive muni-tubers in creases to obtain super-elite SE , class elite E and A class tubers. Stage 3: first field multiplication to get class SE seeds. Stage 4: second field multiplication to get class E seeds. Stage 5: third field multiplication to get class A seeds. The production cost for stages 1 and 2 was, respectively, 0,253 TND and 0,182 TND. For stages 3, 4 and 5 the profitability depended on the multiplication rate in the field; downgrading rate; production cost; selling price. On the other hand, it would appear that the intervention of Groupement Interprofessionnel des Légumes (GIL) was crucial to the production process of class SE , E and A seeds. The free of charge supply of minitubers, by GIL, to seed producers would make the production of class SE seeds profitable. While for classe E and A , however, the profitability was guaranteed only when the rate of multiplication was equal to or higher than six. Compared to imported class E or A seeds, local seeds was less competitive. Further more, the intervention of GIL made local E seed competitive for all producers while the local class A seeds was competitive in the case of producers who got a rate of multiplication higher than four.
Numerical simulations of heat transfer in plane channel flow
Najla El Gharbi,Rafik Absi,Ahmed Benzaoui
Physics , 2010,
Abstract: Reynolds-averaged Navier-Stokes (RANS) turbulence models (such as k-\epsilon models) are still widely used for engineering applications because of their relatively simplicity and robustness. In fully developed plane channel flow (i.e. the flow between two infinitely large plates), even if available models and near-wall treatments provide adequate mean flow velocities, they fail to predict suitable turbulent kinetic energy "TKE" profiles near walls. TKE is involved in determination of eddy viscosity/diffusivity and could therefore provide inaccurate concentrations and temperatures. In order to improve TKE a User Define Function "UDF" based on an analytical profile for TKE was developed and implemented in Fluent. Mean streamwise velocity and turbulent kinetic energy "TKE" profiles were compared to DNS data for friction Reynolds number Re\tau = 150. Simulation results for TKE show accurate profiles. Simulation results for horizontal heated channel flows obtained with Fluent are presented. Numerical results are validated by DNS data for Re\tau = 150.
Combined Effects of Cd and Hg on Liver and Kidney Histology and Function in Wistar Rats  [PDF]
Karima Dardouri, Samir Haouem, Ines Gharbi, Badreddine Sriha, Zohra Haouas, Abdelhamid El Hani, Mohamed Hammami
Journal of Agricultural Chemistry and Environment (JACEN) , 2016, DOI: 10.4236/jacen.2016.54017
Abstract: The present study was performed in order to discern the effects of combined exposure to cadmium and mercury on liver function and histopathological alterations in male adult Wistar rats. In the present investigation, cadmium (100 mg/l) and mercury (25 mg/l) were administered orally for 10 weeks separately or in combination. The rational for studying cadmium and mercury is that both of these metals are encountered frequently in the same contaminated areas. In liver, the activities of serum alanine aminotransferase (ALT) and aspartate amino tranferase (AST) increased significantly in the cadmium (Cd) and mercury (Hg) alone or in combination (Cd + Hg) compared to the control suggesting that both cadmium and mercury cause hepatotoxicity spatially when co-administrated. We noted an increase in serum lactate dehydrogenase (LDH) activity in Cd and combined Cd + Hg treated groups while it decreased in Hg treated group. There was no statistically significant change in the level of total bilirubilin. Serum urea concentration showed a significant increase in the Cd and Hg groups compared to the control group. However an increase in serum creatinine concentration was noted only in the combined treated rats showing that renal insufficiency is more serious in the co-exposed group. Light microscopic examination indicated severe histological changes in the two organs under Cd and mercury influence. Results of the present investigation clearly showed that mercury has profound effects of hepatic handling of cadmium (synergistic effect) as shown by histological and biochemical results. Moreover, we observed a antagonist effect between these two toxic metals on kidney markers such as urea.
Ocular manifestations of Rickettsiosis: 2. Retinal involvement and treatment
Leila El Matri
International Journal of Medical Sciences , 2009,
Abstract:
Effect of near-wall treatments on airflow simulations
Najla El Gharbi,Rafik Absi,Ahmed Benzaoui,E. H. Amara
Physics , 2010,
Abstract: Airflow simulation results depend on a good prediction of near wall turbulence. In this paper a comparative study between different near wall treatments is presented. It is applied to two test cases: (1) the first concerns the fully developed plane channel flow (i.e. the flow between two infinitely large plates). Simulation results are compared to direct numerical simulation (DNS) data of Moser et al. (1999) for $Re\tau$ = 590 (where $Re\tau$ denotes the friction Reynolds number defined by friction velocity $u\tau$, kinematics viscosity $v$ and the channel half-width $\delta$); (2) the second case is a benchmark test for room air distribution (Nielsen, 1990). Simulation results are compared to experimental data obtained with laser-doppler anemometry. Simulations were performed with the aid of the commercial CFD code Fluent (2005). Near wall treatments available in Fluent were tested: Standard Wall Functions, Non Equilibrium Wall Function and Enhanced Wall Treatment. In each case, suitable meshes with adequate position for the first near-wall node are needed. Results of near-wall mean streamwise velocity U+ and turbulent kinetic energy k+ profiles are presented, variables with the superscript of + are those non dimensional by the wall friction velocity $u\tau$ and the kinematic viscosity {\nu}.
Precipitation Kinetics and Mechanism in Cu-7 wt% Ag Alloy  [PDF]
Djamel Hamana, Mohamed Hachouf, Leila Boumaza, Zine El Abidine Biskri
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27120
Abstract: The discontinuous precipitation kinetics and mechanism of the α (Ag-rich) phase in Cu-7 wt% Ag alloy has been investigated using dilatometric and calorimetric anisothermal analysis, optical microscopy, scanning and transmission electron microscopy and X-ray diffraction. Dilatometric and calorimetric curves present at ~ 500°C an important effect related to the ? (Ag-rich) phase formation and consequently the matrix β (Cu-rich) depletion. The nucleation and growth of the precipitated phase show cells formation at initial grain boundaries; a fine lamellar structure is detected by SEM and TEM and consists of alternate lamellar of the α (Ag-rich) and β (Cu-rich)-solid solutions. Cellular precipitation leads to the simultaneous appearance of two diffraction peaks and occurs apparently according to the Fournelle and Clark’s mechanism. Obtained results give an Avrami exponent n = 2.0 ± 0.2 in agreement with an interfacial controlled process having an activation energy Ea equals to 99 ± 7 kJ/mol obtained from anisothermal analysis by using different isoconversion methods. This activation energy expresses the discrepancy between isoconversion methods and the analytical diffusive model. Moreover, the supersaturation rate has an effect on the lamella spacing of the precipitated cells.
Evaluation of Genetic Diversity in Aegilops geniculata Roth Accessions using Morphological and RAPD Markers
A. Mahjoub,Mohamed Salah El Gharbi,K. Mguis,Mohamed El Gazzah
Pakistan Journal of Biological Sciences , 2009,
Abstract: Thirteen Aegilops geniculata Roth (geniculate goat grass) accessions from collection of the North and Central Tunisian (Cap-Bon, Mogodses, Kroumiry and the Dorsal areas) were used to assess its genetic diversity by morphological and Random Amplified Polymorphic DNA (RAPD) data and to evaluate relationship between morphological and RAPD markers. Nineteen morphological traits were analyzed on all accessions using Principal Analysis Component (PCA) and clusters were constrained based on median joining distances. Nineteen arbitrary universal primers were used for the amplification of random DNA sequences and generated 212 bands ranging from 0.5 to 3 kb with 71.27% polymorphism across the 13 accessions. Both RAPD and morphological data classified accessions in two main groups. Both methods were used to compare how morphological traits and RAPD molecular markers described accessions relationship and showed a high degree of variation among analyzed accessions, indicating an important source of genetic diversity that can be used in future breeding programs. Morphological PCA traits and cluster indicated climatic stage. In fact, they grouped Ae. geniculata accessions according to genetic criteria such as earliness and high kernel yield. Comparison of morphological and molecular data using the Mantel test indicated a non significant correlation (r = -0.268). Nevertheless, RAPD and selected morphological characters appear as useful and complementary techniques for evaluation of genetic diversity in Ae. geniculata.
A Topological Magueijo-Smolin Varying Speed of Light Theory, the Accelerated Cosmic Expansion and the Dark Energy of Pure Gravity  [PDF]
Mohamed Salah El Naschie, Leila Marek-Crnjac, Mohamed Atef Helal, Ji-Huan He
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.512171
Abstract: The paper presents a detailed analysis of ordinary and dark energy density of the cosmos based on two different but complimentary theories. First, and starting from the concept of the speed of light being an average over multi-fractals, we use Magueijo-Smolin’s ingenious revision of Einstein’s special relativity famous formula E = mc2 to a doubly special formula which includes the Planck energy as invariant to derive the ordinary energy density E(O) = mc2/22 and the dark energy density E(D) = mc2(21/22) wheremis the mass andcis the speed of light. Second we use the topological theory of pure gravity to reach the same result thus confirming the correctness of the theory of varying speed of light as well as the COBE, WMAP and Type 1a supernova cosmological measurements.
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