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Search Results: 1 - 10 of 134 matches for " Seddik Bouras "
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Design of a Haulage System Operating on a Downward Curvilinear Track
Salah Tolba,Salah Saad,Seddik Bouras
Journal of Engineering and Applied Sciences , 2012,
Abstract: One of the most important problems met in cable downward installations is the considerable unbalance between tensions of two cable bits caused by load variation. This variation mainly caused by downward cable bit mass which induces amplitude in torque variation applied to control group. To maintain skip speed in recommended limits and limit the motor drive power as well as operation mode, dynamic balancing of downward system is carried out. This system acts as to limit the difference between tensions of the two downward system cable bits. In this study, it is recommended the application of downward track having a variable slope angle to realise a dynamic balancing system. Thus, because of track curvilinear shape, the decomposition of forces acting on each cable bit is such that to realize tensions equality between the two cable bits. The other advantage of this balancing type is the application of a constant braking torque which is an important factor for the choice and rational use of control group.
MICROMEGAS Signal: Numerical Simulation Based on Neon-Isobutane and Neon-DME  [PDF]
Hamid Mounir, Seddik Bri
Modern Instrumentation (MI) , 2015, DOI: 10.4236/mi.2015.41001
Abstract: Recent years, we have seen the development of many fields of gas detectors. The MICROMEGAS (Micro-Mesh Gas Structure) appeared as the very promising detector. It is a major family of position detectors in High Energy Physics. This work is done in normal (NTP) based gas mixtures: neon are noble gas and isobutane and DME (dimethyl-ether) as moderators gas (quenchers), using 55Fe as a radiation source (X-ray 5.9 keV). To address the modeling of MICROMEGAS detector, a descriptive model of different physical and geometrical phenomena MICROMEGAS was established by developing a simulation program to spreading the detector response. After, an analytical calculation of the potential and the electric field distributions has been presented briefly, to better estimate electrical and geometric configuration. Finally, simulation results of electrical signals based on gas mixtures (Neon-isobutane, Neon-DME) produced by MICROMEGAS were presented and analyzed in order to improve the MICROMEGAS performance (spatial (12 μm) and temporal (0.7 ns) resolutions).
Vascular brain aging
Bouras Constantin
Annals of General Psychiatry , 2006, DOI: 10.1186/1744-859x-5-s1-s12
Abstract:
Abel-Jacobi theorem
Seddik Gmira
Mathematics , 2015,
Abstract: The Abel Jacobi theorem is an important result of algebraic geometry. The theory of divisors and the Riemann bilinear relations are fundamental to the developement of this result: if a point O is fixed in a Riemann compact surface X of genus g, the Abel Jaobi map identifies the Picard group: the quotient of divisors of a group of degree zero by the sub-group of divisors associated to meromorphic functions. The Riemann surface of genus g can be embedded in the Jacobian variety via the Abel-Jacobi. In fact, generally.the surface may be provided with an analytical structure.or algebraic varietie.
Optimal M-BCJR Turbo Decoding: The Z-MAP Algorithm  [PDF]
Aissa Ouardi, Ali Djebbari, Boubakar Seddik Bouazza
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.24031
Abstract: In this paper, we propose a novel idea for improvement performances of the leader M-BCJR algorithm functioning in low complexity. The basic idea consists to localize error instant possibility, and then increase the complexity around this moment. We also propose an easy and important idea for early localisation of erroneous moments. We call this new algorithm Z-MAP. The simulations show that the improvement of performances is significant. The performances of Z-MAP turbo decoding are so close to full MAP-BCJR performances. Furthermore, the complexity is the same that of the M-BCJR. So, Z-MAP is an optimal version of M-BCJR algorithm.
Study of New Planar Resonator’s Topologies Little Perceptible in Variations of Substratum’s Height  [PDF]
Nizar Zrigui, Lahbib Zenkouar, Seddik Bri
Circuits and Systems (CS) , 2012, DOI: 10.4236/cs.2012.33031
Abstract: The mobile communication (radio, mobile, satellite telephony…) insert band filters which are required to comply with stringent pass-band characteristics concerning the selectivity, the group delay, the insertion losses and the mass and volume. The mass and volume of payload electronic equipment is a significant contributor to the overall cost of space systems. Within this framework, many improvements were made in the design of filters and multiplexers which represent a considerable portion of the overall satellite payload. The High Temperature Superconducting (HTS) planar technology permits to realize compact size filtering devices. Moreover, it could also provide a superior performance not attainable by any other technology. However, not controllable parameters in the manufacturing processes (indistinctness of the engraving, the not uniformity of substratum thickness) do not allow to obtain a precision on the echo’s frequency and to keep a high quality factor. So, it is necessary to use method to tune the center frequency of filters after the fabrication or to study new resonator topologies which present lower sensitivity to LAIO3 substrate thickness. This last point is the object of this article.
Conception of the Solar Regulator for Renewable Energy  [PDF]
Seddik Bri, Mohammed Elalami, Abdelrhani Nakheli
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.33029
Abstract: In this work, we are interested in conducting a technological research on the use of the renewable energy, particularly the “photovoltaic” to achieve a complete system for the controlled production of energy. In fact, we talked about the different types of renewable energy and their importance to the economic sector; photovoltaic cells and its operating principle, modeling, current-voltage characteristics and the influence of parameters on the performance of energy that makes us think to make followers continued to enjoy the maximum of energy. The integration of regulator renewable energy in the embedded system by using a microcontroller.
Comparison of Circular Sector and Rectangular Patch Antenna Arrays in C-Band  [PDF]
Anouar Dalli, Lahbib Zenkouar, Seddik Bri
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.411064
Abstract: The circular sector patch antenna is studied in C-band (4 GHz - 8 GHz). In this paper, we present steps of designing the circular sector antenna then a comparison with a rectangular antenna in literature. High Frequency Structure Simulator (HFSS) software is used to compute the gain, axial ratio, radiation pattern, and return loss S11 of proposed antenna. Based on the designed patch antenna, many phased arrays will be simulated using HFSS. The impact of distance between element, number of element and phase will be checked. Obtained results are analyzed and compared with literature.
Modeling the Chain of Conversion for a PV System  [PDF]
Mohammed El Alami, Mohamed Habibi, Seddik Bri
Smart Grid and Renewable Energy (SGRE) , 2014, DOI: 10.4236/sgre.2014.510022
Abstract: In this work, we conduct a study of modeling and simulation of a system in the context of renewable energy in general, and solar system “photovoltaic” in particular; also, the optimizing system adapted by DC-DC converters static. Then the influence of temperature and irradiance on the optimal parameters (Power of MPP, VMPP, ...) of a solar system is analyzed in a way to operate a PV generator at its maximum power. This system includes a photovoltaic generator, “Boost & Buck”, converter and a load. Modeling and simulation system (solar panel, DC-DC converter command and load) is obtained through Matlab-Simulink software.
Design of Dual-Mode Substrate Integrated Waveguide Band-Pass Filters  [PDF]
Ahmed Rhbanou, Mohamed Sabbane, Seddik Bri
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.612026
Abstract: Three dual-mode band-pass filters are presented in the present paper. The first filter is realized by dual-mode substrate integrated waveguide (SIW) cavity; the second is based on the integration of SIW cavity with electromagnetic band gap (EBG); and the third is based on the integration of SIW cavity with complementary split ring resonator (CSRR). The dual-mode SIW cavity is designed to have a fractional bandwidth of 4.95% at the midband frequency of 9.08 GHz; the proposed EBG-SIW resonator operates at 9.12 GHz with a bandwidth of 4.38% and the CSRR-SIW resonator operates at 8.66 GHz with a bandwidth of 2.54%. The proposed filters have the high Q-factors and generate a transmission zero in upper stopband, and these by the use of Rogers RT/duriod 5880 (tm).
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