oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 10 )

2019 ( 689 )

2018 ( 818 )

2017 ( 752 )

Custom range...

Search Results: 1 - 10 of 461889 matches for " A. Bouanane "
All listed articles are free for downloading (OA Articles)
Page 1 /461889
Display every page Item
Neural Adaptive Control by State Space Regulator of Universal Charge for the Compensation of Active and Reactive Power
A. Bouanane,A. Chaker
International Journal of Electrical and Power Engineering , 2012, DOI: 10.3923/ijepe.2012.43.50
Abstract: In the present study, researchers present the effectiveness of the controller trical power flow universal (Unified Power Flow Controller, UPFC) with the choice of a control strategy. To evaluate the performance and robustness of the system, we proposed a hybrid control combining the concept of neural networks with conventional regulators vis-a-vis the changes in characteristics of the transmission line in order to improve the stability of the electrical power network.
A Simple Technique to Estimate the Flammability Index of Moroccan Forest Fuels
M'Hamed Hachmi,Abdessadek Sesbou,Hassan Benjelloun,Nesrine El Handouz,Fadoua Bouanane
Journal of Combustion , 2011, DOI: 10.1155/2011/263531
Abstract: A formula to estimate forest fuel flammability index (FI) is proposed, integrating three species flammability parameters: time to ignition, time of combustion, and flame height. Thirty-one (31) Moroccan tree and shrub species were tested within a wide range of fuel moisture contents. Six species flammability classes were identified. An ANOVA of the FI-values was performed and analyzed using four different sample sizes of 12, 24, 36, and 50 flammability tests. Fuel humidity content is inversely correlated to the FI-value, and the linear model appears to be the most adequate equation that may predict the hypothetical threshold-point of humidity of extinction. Most of the Moroccan forest fuels studied are classified as moderately flammable to flammable species based on their average humidity content, calculated for the summer period from July to September. 1. Introduction Wildland fire intensity is highly related to forest vegetation type and structure, importance of fine and coarse fuel types, biomass of live and dead surface fuels, fuel moisture content, land topography, weather factors, and to forest stand growth conditions. Therefore there has been need to study these parameters to develop helpful tools for forest-management decision makers [1–9] based on fuel hazard and fire risk assessment. Most of previous investigations have focused on determining the forest fuel species fire behavior based on their flammability values estimated through thermal and chemical calorimetric studies [10–17], thermo-gravimetric or limiting oxygen index analysis [18–21], or through simple laboratory flammability tests performed using an electric radiator equipped with an external pilot flame [22–24] as shown in Figure 1. Figure 1: Electric radiator apparatus used for fuel species flammability testing: (a) the real apparatus used in this study and (b) its illustrating schematic components. No standard norm exists for testing forest species flammability, because the flammability parameter can be seen as a plant property that has no unit, involving three components [25]: ignitability (time to ignition), the most important factor to consider, combustibility (rate of burn after ignition), and sustainability (total burning time). Liodakis et al. [26] have also related the sustainability term to the rate of fire spread. Anderson’s study [25] was extended by Martin et al. [27] to include a 4th component named “consumability”, corresponding to the amount of vegetation that is consumed [28]. Regarding the simple laboratory flammability test method, we have to run a group of 50
évaluation de la toxicité aigu de la 2-hydroxy-méthyl-1 (N-phtaloyltryptophyl) aziridine chez le rat Wistar Acute toxicity evaluation of 2-hydroxy-methyl-1 (N-phtaloyltryptophyl) aziridine in Wistar rat
Fatima Zohra Baba Ahmed,Merzouk Hafida,Bouanane Samira,Benkalfat Nacira Batoul
Annales de Toxicologie Analytique , 2010, DOI: 10.1051/ata/2010017
Abstract: Objectifs : Les aziridines, molécules alkylantes à l’ADN, possèdent une grande activité anticancéreuse et antibiotique et modulent le système immunitaire. Une nouvelle aziridine, la 2-hydroxy-méthyl-1 (N-phtaloyltryptophyl) aziridine, a été synthétisée dans notre laboratoire. Cependant, sa toxicité n’est pas connue. L’objectif de ce travail est de déterminer la toxicité aigu de cette aziridine chez le rat Wistar. Matériel et Méthodes: Cinq lots de rats Wistar males re oivent une injection intra péritonéale de 9,35 mg/kg, 37,4 mg/kg, 93,5 mg/kg, 140,25 mg/kg, 187 mg/kg d’aziridine, et sont observés pendant 14 jours. Les mortalités, les modifications du comportement, du poids, et les variations de l’ingestion de nourriture et d’eau, du volume des urines et du poids des fèces sont notées. à la fin de l’expérimentation, les rats recevant la dose sans effet toxique observable (NOAEL) sont sacrifiés, les organes et le sang sont prélevés. Les paramètres hématologiques et biochimiques sont dosés. Résultats : Les résultats montrent que la DL50 de l’aziridine testée est de 104,71 mg/kg. L’injection de la dose d’aziridine à 9,35 mg/kg (NOAEL) ne provoque pas de mortalité, ni de variations du poids corporel, de la nourriture et l’eau consommés et des excrétas. De plus à cette dose, les taux de globules rouges et blancs et d’hémoglobine ainsi que les paramètres biochimiques (glucose, cholestérol, triglycérides, urée, créatinine, bilirubine, protéines totales, transaminases) et les poids des organes (foie, rein, rate, pancréas, c ur, muscle, et cerceau) ne sont pas affectés. Conclusion : La 2-hydroxy-méthyl-1 (N-phtaloyltryptophyl) aziridine pourrait être éventuellement proposée pour des essais cliniques après avoir procédé à toutes les études toxicologiques pré-requises à ces essais. Objective: Aziridines, DNA-binding drugs, display potent anticancer and antibiotic activities and modulate the immune system. A new aziridine, 2-hydroxy-méthyl-1 (N-phtaloyltryptophyl) aziridine, was synthesized in our laboratory; however, its toxicity is not known. The aim of this work is to determine the acute toxicity of this aziridine in Wistar rat. Material and Methods: Five groups of male wistar rats were treated with 9.35 mg/kg, 37.4 mg/kg, 93.5 mg/kg, 140.25 mg/kg and 187 mg/kg of the aziridine, and were observed for 14 days. The mortality, comportmental and weight modifications, food and water consumption, and urine volume and feces weight were recorded. At day 14, rats treated with the dose without observable toxic effects (NOAEL) were killed, and organs and blood were taken.
The Spread of Infectious Disease on Network Using Neutrosophic Algebraic Structure  [PDF]
A. Zubairu, A. A. Ibrahim
Open Journal of Discrete Mathematics (OJDM) , 2017, DOI: 10.4236/ojdm.2017.72009
Abstract: Network theory and its associated techniques has tremendous impact in various discipline and research, from computer, engineering, architecture, humanities, social science to system biology. However in recent years epidemiology can be said to utilizes these potentials of network theory more than any other discipline. Graph which has been considered as the processor in network theory has a close relationship with epidemiology that dated as far back as early 1900 [1]. This is because the earliest models of infectious disease transfer were in a form of compartment which defines a graph even though adequate knowledge of mathematical computation and mechanistic behavior is scarce. This paper introduces a new type of disease propagation on network utilizing the potentials of neutrosophic algebraic group structures and graph theory.
A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation  [PDF]
S. A. A. Sajadi
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22013
Abstract: A comparative research has been developed for acidity and stability constants of M(Glu)1, M(Asp)2 and M(Ttr)3 complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) com-plexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(Asp), some metal ions are able to build chelate over amine groups. The results mentioned-above demonstrate that for some M(Glu) and M(Asp) complexes, the stability constants are also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions, and transfers them through building complexes accompanied with glutamate and aspartate. For heavy metal ions, this building complex helps the absorption and filtration of the blood plasma, and consequently, the excursion of heavy metal ions takes place. This is an important method in micro-dialysis. In this study the different as-pects of stabilization of metal ion complexes regarding to Irving-Williams sequence have been investigated.
Determining the Basaltic Sequence Using Seismic Reflection and Resistivity Methods  [PDF]
A. Alanezi, A. Qadrouh
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B004
Abstract:

This study was carried out in Harat Rahat (south of Almadinah Almonwarah) using seismic reflection and resistivity methods. The main objectives of this study are to determine the extent of the basaltic layer and to define the subsurface faults and fractures that could affect and control the groundwater movement in the study area. A 2D seismic profile was acquired and the result shows that the subsurface in the study area has a major fault. We obtained a well match when the seismic result was compared with drilled wells. As a complementary tool, the resistivity method was applied in order to detect the groundwater level. The results of the resistivity method showed that six distinct layers have been identified. The interpretation of these six layers show that the first three layers, the fourth layer, the fifth layer and the bottom of the section indicated various subsurface structures and lithologies; various basaltic layers, fractured basalt, weathered basement and fresh basaltic layers, respectively. It is obvious that the eventual success of geophysical surveys depend on the combination with other subsurface data sources in order to produce accurate maps.

Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution  [PDF]
S. A. A. Sajadi
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2014, DOI: 10.4236/ojinm.2014.41001
Abstract:

The acidity and stability constants of M(Gly)1, M(Ttr)1, and M(Trp)1 M: Cu2+, Cu(Bpy2)2+, and Cu(Phen3)2+ complexes, were determined by potentiometric pH titration. It is shown that the stability of the binary Cu(L), (L: Gly, Ttr, and Trp) complex is determined by the basicity of the carboxylate group on one side and amino group on the other side. It is demonstrated that the equilibrium, Cu(Ha4)2+ + Cu(L) \"\"Cu(Har)(L) + Cu2+, is displacement due to the well known experience that mixed ligand complexes formed by a divalent 3d ion, a heteroaromatic N base and an O donor ligand possess increased stability. The stability constants of the 1:1 complexes formed between Cu2+, Cu(Bpy)2+ or Cu(Phen)2+

Adaptive Fuzzy Sliding Mode Controller for Grid Interface Ocean Wave Energy Conversion  [PDF]
Adel A. A. Elgammal
Journal of Intelligent Learning Systems and Applications (JILSA) , 2014, DOI: 10.4236/jilsa.2014.62006
Abstract:

This paper presents a closed-loop vector control structure based on adaptive Fuzzy Logic Sliding Mode Controller (FL-SMC) for a grid-connected Wave Energy Conversion System (WECS) driven Self-Excited Induction Generator (SEIG). The aim of the developed control method is to automatically tune and optimize the scaling factors and the membership functions of the Fuzzy Logic Controllers (FLC) using Multi-Objective Genetic Algorithms (MOGA) and Multi-Objective Particle Swarm Optimization (MOPSO). Two Pulse Width Modulated voltage source PWM converters with a carrier-based Sinusoidal PWM modulation for both Generator- and Grid-side converters have been connected back to back between the generator terminals and utility grid via common DC link. The indirect vector control scheme is implemented to maintain balance between generated power and power supplied to the grid and maintain the terminal voltage of the generator and the DC bus voltage constant for variable rotor speed and load. Simulation study has been carried out using the MATLAB/Simulink environment to verify the robustness of the power electronics converters and the effectiveness of proposed control method under steady state and transient conditions and also machine parameters mismatches. The proposed control scheme has improved the voltage regulation and the transient performance of the wave energy scheme over a wide range of operating conditions.

Geochemical Characteristics and Chemical Electron Microprobe U-Pb-Th Dating of Pitchblende Mineralization from Gabal Gattar Younger Granite, North Eastern Desert, Egypt  [PDF]
Hassan A. A. Shahin
Open Journal of Geology (OJG) , 2014, DOI: 10.4236/ojg.2014.41003
Abstract:

Pitchblende mineralization was studied in the younger granite samples collected from Gabal Gattar, north Eastern Desert, Egypt using electron scanning microscope (ESM) and electron probe microanalyses (EPMA). This study revealed that this pitchblende contains significant Zr content reaching up to (66.80% ZrO2), which suggests that volcanic rocks were probably the source of such a deposit. High level emplaced high-K Calc-alkaline plutons as Qattar granite may have been associated with their volcanic equivalent emplaced in the surrounding area or now eroded. Lead content of the pitchblende mineralization is high and with moderate volcanics (up to 7.71% PbO). In contrast, it is low in ThO2, Y2O3 and REE2O3. High Zr and Pb content associated with pitchblende mineralization from Gattar granite indicates

Page 1 /461889
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.