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Fahima Fellah,Rédha Djenidi,Imen Chebout 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.2
Objective Immunomodulation is a therapeutic technique that modulates the balance of cytokines in the body. In this regard, our experiment was conducted to investigate the potential effect of S. coronopifolius crude extract in combination with low dose of Bacillus Calmette- Guerin (BCG) on depression-like behaviors in female Wistar rats. Methods Sciatic nerve injury was employed to induce depression and intradermal injection of 0.02 mL of BCG per rat was administered to lead an activation of innate immune system. Daily intra-peritoneal injections of 25 mg algae extract kg-1 body weight were performed for 14 continuous days. Forced Swimming (FS) and Open Field (OF) tests were conducted to assess despairing and spontaneous behaviors. At the end of the experiment, brain was removed to determine the activities of catalase (CAT) and glutathione-S-transferase (GST), whereas spleen and adrenals were used for the histopathological study. Results The combined treatment exhibited antidepressant-like activity in FST by reducing immobility time, without inducing any significant change in ambulatory behavior in OFT. The histological analyses of spleen and adrenal structure showed a conserved architecture. Conclusion The results suggested that algae extract produce an antidepressant-like effect in combination with low dose of BCG, which is possibly trigged by its anti-oxidant and anti-inflammatory properties.
A novel refined shear deformation theory for the buckling analysis of thick isotropic plates
M. Fellah,Kada Draiche,Mohammed Sid Ahmed Houari,Abdelouahed Tounsi,Tareq Saeed,Mohammed Sh Alhodaly,Mohamed Benguediab 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.3
In present study, a novel refined hyperbolic shear deformation theory is proposed for the buckling analysis of thick isotropic plates. The new displacement field is constructed with only two unknowns, as against three or more in other higher order shear deformation theories. However, the hyperbolic sine function is assigned according to the shearing stress distribution across the plate thickness, and satisfies the zero traction boundary conditions on the top and bottom surfaces of the plate without using any shear correction factors. The equations of motion associated with the present theory are obtained using the principle of virtual work. The analytical solution of the buckling of simply supported plates subjected to uniaxial and biaxial loading conditions was obtained using the Navier method. The critical buckling load results for thick isotropic square plates are compared with various available results in the literature given by other theories. From the present analysis, it can be concluded that the proposed theory is accurate and efficient in predicting the buckling response of isotropic plates.
Ali Fellah Jahromi,Wen-Fang Xie,Rama B. Bhat 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
The interaction of the ride and handling systems is one of the challenging topics in vehicle dynamics and control. In this study the dynamic behavior of a passenger car considering coupling among all the fourteen degrees of freedom is modeled using Boltzmann Hamel equations. In order to improve the ride quality and stability of the vehicle, a Magnetorheological damper and a differential braking system are used as control devices. Based on the nonlinear integrated ride and handling vehicle model, a nonlinear H-infinity controller is designed for an intermediate passenger car. The dynamic behavior of the controlled vehicle is simulated for single lane change and bump input, considering three different road conditions: Dry, rainy and snowy. The robustness of the designed controller is investigated when the vehicle is under these road conditions. The simulation results confirm the interactive nature of the ride and handling systems and the robustness of the designed control strategy.
High photocatalytic capacity of porous ceramic-based powder doped with MgO
Bouras Dikra,Fellah Mamoun,Mecif Abla,Barillé Régis,Obrosov Aleksei,Rasheed Mohammed 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.1
To purify water at low cost for our daily life, the effect of ceramic-based (mullite–cristobalite) and (mullite–zircon) powders doped with different amounts of magnesium oxide (MgO) (10 and 20 wt%) was studied. These compounds are made of a local raw material DD3 with addition of zirconia (ZrO2) to create an open porosity. The powders were prepared by the traditional mixing method with the help of an automated crushing. The effect of MgO doping on structural, morphological and photocatalytic properties of the material was studied by various analytical techniques such as X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, infrared, and UV–visible spectrometry. The results of XRD proved that there was a deformation in the crystal structure of the two types of ceramics after addition, which resulted in a shift of the spectra to the right, while SEM proved the presence of pores with a larger size as the proportion of MgO increases. The chemical composition of the basic components of the ceramic compounds as well as the additive was confirmed with EDS and IR spectra. The final results show that ceramics with added zirconia (DD3Z) and doped with 10% of MgO have a better photocatalytic efficiency than ceramics without zirconia. This important effect could be related to the higher rate of porosity, which provides a more active surface. The 10% MgO content showed a high photoactivity of 77.33% in only 15 min. The maximum hydrolysis rate obtained with Orange II was 92.95% after a period of 45 min with DD3Z/MgO powders.
Fine Granularity Access Rights for Information Flow Control in Object Oriented Systems
Allaoua Maamir,Abdelaziz Fellah,Lina A. Salem 보안공학연구지원센터 2008 International Journal of Security and Its Applicat Vol.2 No.3
One of the main features of information flow control is to ensure the enforcement of privacy and regulated accessibility. However, most information flow control models that have been proposed do not provide substantial assurance to enforce end-to-end confidentiality policies or they are too restrictive, overprotected, and inflexible. We present a model for discretionary access controls that is in harmony with the object oriented paradigm. The model uses access rights applied to object attributes and methods, thus allowing considerable flexibility without compromising system security by leaking sensitive information. Models based on message filtering intercept every message exchanged among objects to control the flow of information. We present an algorithm which enforces message filtering based on the defined access rights.
The Control of Nonlinear Thermal System with Large Delay Time Using Feedback Linerarization Strategy
Seiyed Hamid Zareh,Ali-Fellah Jahromi,Amir Ali Khayyat 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper first will describe the Feedback Linearization Method when the Proportional-Integral-Derivative (PID) controllers are inactive in procedures that have large delay time (LDT) in transfer stage. Therefore in those states, Feedback Linearization has a better performance with respect to PID controllers. Feedback linearization is a common approach used in controlling nonlinear systems by an equivalent linear system through a change of variables and a suitable control input. This nonlinear control strategy studies how to apply existing linear methods to these more general control systems. Eventually, a nonlinear thermal system, which circulates hot air to keep the temperature of a chamber constant have been linearized and control by Feedback Linearization theory and finally the results are analyzed and compared.
Backstepping Control for Multi-Machine Web Winding System
Bousmaha Bouchiba,Abdeldjebar Hazzab,Hachemi Glaoui,Fellah Med-Karim,Ismail Khalil Bousserhane,Pierre Sicard 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.1
This work treat the modeling and simulation of non-linear dynamic behavior of a web winding process during traction. We designate by a winding process any system applying the cycles of unwinding, transport, treatment, and winding to various flat products. This system knows several constraints, such as the thermal effects caused by the frictions, and the mechanical effects provoked by metal elongation, that generates dysfunctions due to the influence of the process conditions. Several controllers are considered, including Proportional-integral (PI) and Backstepping control. This paper presents the study of Backstepping controls strategy of the winding system. Our winding system is simulated in MATLAB SIMULINK environment, the results obtained illustrate the efficiency of the proposed control with no overshoot, and the rising time is improved with good disturbances rejections comparing with the classical control law.
Speed Control of Linear Induction Motor using Sliding Mode Controller Considering the End Effects
A. Boucheta,I. K. Bousserhane,A. Hazzab,P. Sicard,M. K. Fellah 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.1
In the present paper, the mover speed control of a linear induction motor (LIM) using a sliding mode control design is proposed, considering the end effects. First, the indirect field-oriented control LIM is derived, considering the end effects. The sliding mode control design is then investigated to achieve speed- and flux-tracking under load thrust force disturbance. The numerical simulation results of the proposed scheme present good performances in comparison to that of the classical sliding mode control.
Speed Control of Linear Induction Motor using Sliding Mode Controller Considering the End Effects
Boucheta, A.,Bousserhane, I.K.,Hazzab, A.,Sicard, P.,Fellah, M.K. The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.1
In the present paper, the mover speed control of a linear induction motor (LIM) using a sliding mode control design is proposed, considering the end effects. First, the indirect field-oriented control LIM is derived, considering the end effects. The sliding mode control design is then investigated to achieve speed- and flux-tracking under load thrust force disturbance. The numerical simulation results of the proposed scheme present good performances in comparison to that of the classical sliding mode control.
Backstepping Control for Multi-Machine Web Winding System
Bouchiba, Bousmaha,Hazzab, Abdeldjebar,Glaoui, Hachemi,Med-Karim, Fellah,Bousserhane, Ismail Khalil,Sicard, Pierre The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.1
This work treat the modeling and simulation of non-linear dynamic behavior of a web winding process during traction. We designate by a winding process any system applying the cycles of unwinding, transport, treatment, and winding to various flat products. This system knows several constraints, such as the thermal effects caused by the frictions, and the mechanical effects provoked by metal elongation, that generates dysfunctions due to the influence of the process conditions. Several controllers are considered, including Proportional-integral (PI) and Backstepping control. This paper presents the study of Backstepping controls strategy of the winding system. Our winding system is simulated in MATLAB SIMULINK environment, the results obtained illustrate the efficiency of the proposed control with no overshoot, and the rising time is improved with good disturbances rejections comparing with the classical control law.