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Search Results: 1 - 10 of 8966 matches for " Tadjine Mohamed "
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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.
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.
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?
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.
Modelling and Stabilizing Control Laws Design Based on Sliding Mode for an UAV Type-Quadrotor
Engineering Letters , 2007,
The Effects of Residual Blood of Carcasses on Poultry Technological Quality  [PDF]
Bourbab Mohamed, Idaomar Mohamed
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.310181
Abstract: The objective of this work is to show the effect of residual blood on the quality of chicken meat, work based on the hypothesis that increasing the concentration of residual blood would explain the observed quality degradation by several authors. Lots of chickens are killed with two different types of slaughter: Slaughter without stunning for a maximum flow of blood or bleeding perfect PS, shooting seals slight lead to keep almost all blood from the carcass or bleeding IS flawed. To prove the residual blood factors that are responsible for high pHu level and high values of (L* A* B*) in poultry, this study compares the pHu level and values of (L* A* B*) in poultry both perfectly and imperfectly bled. Samples from imperfectly bled carcasses show a high value average number of A* = 12.68 and B* = 16.85; and L* = 54.09 VS the average number of A* = 8.50 and B* = 14.43 and L* = 50.27. At 3℃ storage temperature, the average pHu of perfectly bled poultry was (5.7) which was significantly (P < 0.01) lower than the average pHu of imperfectly bled poultry (6.08). At 7℃ storage temperature, the average pHu of perfectly bled poultry was (6.07) which was significantly (P < 0.05) lower than the average pHu of imperfectly bled one (6.27). We found out the effect of season on the results of pHu measures, so we conducted aanalysis of pHu in summer and winter. Residual blood of the poultry is responsible for high values of (L* A* B*) and high values of pHu therefore the deterioration of the poultry Colour.
Monitoring of Temporal and Spatial Changes of Land Use and Land Cover in Metropolitan Regions through Remote Sensing and GIS  [PDF]
Mohamed Ali Mohamed
Natural Resources (NR) , 2017, DOI: 10.4236/nr.2017.85022
Abstract: The use of remote sensing techniques and subsequent analysis by means of geographical information system (GIS) offers an effective method for monitoring temporal and spatial changes of landscapes. This work studies the urbanization processes and associated threats to natural ecosystems and resources in the metropolitan areas of Berlin and Erlangen-Fürth-Nürnber?Schwabach (EFNS). To compute the land use/cover (LULC) of the study areas, a supervised classification of “maximum likelihood” using Landsat data for the years of 1972, 1985, 1998, 2003, and 2015 is used. Results show that the built-up area is the dominant land use in both regions throughout the study period. This land use has increased at the expense of green and open areas in EFNS and at the expense of agricultural land in Berlin. Likewise, 5% of forest in EFNS is replaced with urban infrastructure. However, the amount of forest in Berlin increased by 3%. While EFNS experienced relatively big changes in its water bodies from 1972 to 1985, changes in water bodies in Berlin were rather slight during the last 40 years. The overall accuracy of our remotely sensed LULC maps was between 88% and 94% in Berlin and between 85.87% and 87.4% for EFNS. The combination of remote sensing and GIS appears to be an indispensable tool for monitoring changes in LULC in urban areas and help improving LU planning to avoid environmental and ecological problems.
Analysis of Digital Elevation Model and LNDSAT Data Using Geographic Information System for Soil Mapping in Urban Areas  [PDF]
Mohamed Ali Mohamed
Natural Resources (NR) , 2017, DOI: 10.4236/nr.2017.812047
This study applies digital analysis methods of topographic data derived from digital elevation models (DEMs) and Landsat remotely sensed spectral data using GIS tools to evaluate the quality and limitations of the morphometric parameters (terrain attributes: TAs). This aims to check its suitability for digital soil mapping (DSM) and survey in urban areas at the target scale 1:50,000. This scale represents the standard scale level for compiling soil inventories within all German states. The study is conducted on an urban area of 112.68 km2 in the southwest part of the state of Berlin in Germany. These relief units are the basis for determining the soil mapping units at the scale of 1:50,000. The generated preliminary soil map was compared to soil maps made using traditional soil survey methods. For the mainly natural soils, the equivalence area is 94.91%, and for the anthropogenic soils, the equivalence area is 95.34%. The proposed methodology is adequate for preliminary mapping of soil units based on the digital derivation of TAs. Landsat scenes are spatially explicit, physical representations of environmental covariates on the land surface. The free DEM-ASTER in combination with Landsat OLI images is found to be the appropriate model to represent the terrain surface and derive the TAs for environmental modeling and fitting of derivation the relief units and their topography features. However, the 30 m spatial resolution and the fairly coarse spectral resolution of DEMs and Landsat images limit their utility for digital soil mapping at this scale in urban areas with little topographic variation.
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.
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