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Search Results: 1 - 10 of 461785 matches for " A. Tadjine "
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Toxicity of Dust of Dismissed Complex of Steel Annaba on Some Hematologic Parameters of Rabbit (Europeus)
A. Tadjine,A. Courtois,H. Djebar
Environmental Research Journal , 2012,
Abstract: Since the fog of London of 1952, in which more than 4000 people were killed in 4 days, the combined efforts of the scientists of several disciplines of disciplines, including those of environmental health, private clinics and biomedical, serious concerns concerning the impact of the pollutants of the air raised on human health. These environmental pollutants quickly are identified as important and independent factors of risk for several diseases such as respiratory affections, the cancer of lung, the atherosclerosis, the cardiovascular diseases and the disturbances of the blood parameters. In our study one was interested in the harmful action of the atmospheric pollutants on the human organism particularly on the blood parameters. Annaba, capital industrial of the Algerian east is subjected since many years to the aggressiveness of a polluted environment, in particular with the dust of dismissed complex of steel. An experimental research on rabbits (Europeus) exposed to these dust was considered. Samples of blood are taken after 3, 7 and 21 days daily exposure to 2 g of dust collected of the steel complex for a hematological study. The results of the studied parameters show a reduction in the hematocrit and haemoglobin, a disturbed evolution of the lymphocytes and leucocytes an increase in number of blood plates and a smear presenting of red blood corpuscles with a roughcast membrane.
Incorporation Effect of an Organic Load Resulting from Cores’s Date in a Composite Biomechanical Material by Stress Analysis
K. Tadjine,M. Baccouche,A. Haddi,C. Mathieu
Asian Journal of Information Technology , 2012,
Abstract: This study relates the incorporation effect of a natural organic load (date core’s pellets) in a laminated composite woven containing methyl methacrylate of orthopedic use. The goal of this research was the improvement of the existing product used as human prosthesis tibiale which presents failures in the form of microfissurings, of transverse cracks and a delamination on the layers level. This consists to implement a new hybrid composite with reinforcement fiber glass and particles of date cores. A characterization was carried out by varying the number of folds on the level of the initial orthopedic composite to know the sequence influence stacking on the mechanical behavior. Another characterization is carried out on the new hybrid composite. Within the framework of this approach, a comparative results study obtained of the stress intensity factors shows a significant increase in the mechanical characteristics and highlights the mechanical resistance improvement of the new laminate. This research was first experiment incorporation of this granulated kind in a polymeric matrix for the manufacture orthopedic composite used and open prospects to other applications hybrid composite.
Backstepping/DTC control of a double star synchronous machine drive
D. Boudana, L. Nezli, A. Tlem ani, M. O. Mahmoudi, M. Djemai, M. Tadjine
Archives of Control Sciences , 2010, DOI: 10.2478/v10170-010-0015-6
Abstract: Direct torque control (DTC) allows for very high quality torque control without a need for current controllers tuning or using coordinate transformation. However, barge torque ripples arise as well as inconstant inverter switching frequency due to the hysteresis of comparators. This paper present a backstepping/DTC control based on the space vector modulation (SVPWM) for double star synchronous machine (DSSM) to reduce the torque, flux, current and speed pulsations during steady state. By the coordinate transformation the DSSM models are presented in view of control. Then a conventional DTC is developed to get a decoupled system and a PI controller is designed to control the speed. To improve the static and dynamic control performance of the DSSM, the speed controller is designed using a backstepping/DTC procedure in conjunction with SVPWM. Simulation results with the conventional DTC and proposed backstepping/DTC are presented and compared. Results show the effectiveness and the robustness of the approach proposed.
Urban Spreading out in Algeria and its Consequences on the Environment
Tadjine Brahim,Messaoud farid
Environmental Research Journal , 2012,
Abstract: Town planning in general and urban spreading out in particularly are identified by all the researchers like an anthropic action, which produces harmful effects to the environment, because it appears by the increase in cities. The majority of the cities that currently count Algeria literally exploded since the Seventies, without any respect of agricultural spaces and the natural environment their respective sites: Algiers, which did not occupy more than 7.500 ha in 1970, has almost triplet its surface since, by consuming 17.000 ha. Tlemcen passed from 535 ha in 1965 to 2.200 ha currently. An occupation of unsuitable spaces has the urbanization; Arable land losses and proliferation of lost spaces; Problems of pollution and transport as town planners, which solutions can we give to solve this problem?
A simple goal seeking navigation method for a mobile robot using human sense, fuzzy logic and reinforcement learning
Boubertakh Hamid,Tadjine Mohamed,Glorennec Pierre-Yves,Labiod Salim
Journal of Automatic Control , 2008, DOI: 10.2298/jac0801023b
Abstract: This paper proposes a new fuzzy logic-based navigation method for a mobile robot moving in an unknown environment. This method allows the robot obstacles avoidance and goal seeking without being stuck in local minima. A simple Fuzzy controller is constructed based on the human sense and a fuzzy reinforcement learning algorithm is used to fine tune the fuzzy rule base parameters. The advantages of the proposed method are its simplicity, its easy implementation for industrial applications, and the robot joins its objective despite the environment complexity. Some simulation results of the proposed method and a comparison with previous works are provided.
Modelling and Stabilizing Control Laws Design Based on Sliding Mode for an UAV Type-Quadrotor
Engineering Letters , 2007,
Doubly Fed Induction Generator Modeling and Scalar Controlled for Supplying an Isolated Site
Said Drid,Mohamed-Said Nait-Said,Abdesslam Makouf,Mohamed Tadjine
Journal of Electrical Systems , 2006,
Abstract: This paper deal with the scalar control of the doubly fed induction generator, (DFIG), supplying an isolated site and using the wind power. The DFIG is more adapted for this application, because even if it receives a variable speed on its rotor shaft, due to variable wind speed, a voltage wave with constants magnitude and frequency can be produced. If the injected rotor currents with the specific voltage/frequency ratio according to rotor variable speed and the fixed frequency and magnitude stator voltage are the known problems, than to solve these latter, a simple scalar control method is proposed taking into account the variable speed condition. Experimental results are given in this work so as to attest the feasibility and the simplicity of our method.
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.
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