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An Advanced FMRL Controller for FACTS Devices to Enhance Dynamic Performance of Power Systems

International Journal of Automation and computing 2011年第3期8卷 309-316页

作者： Abdellatif Naceri habib hamdaoui Mohamed Abid IRECOM Laboratory Department of Electrical Engineering Djillali Liabes University of Sidi Bel-Abbes ICEPS Laboratory Department of Electrical Engineering Djillali Liabes University of Sidi Bel-Abbes

The parameters of power system slowly change with time due to environmental effects or may change rapidly due to faults. It is preferable that the control technique in this system possesses robustness for various fault conditions and disturbances. The used flexible alternating current transmission system （FACTS） in this paper is an advanced super-conducting magnetic energy storage （ASMES）. Many control techniques that use ASMES to improve power system stability have been proposed. While fuzzy controller has proven its value in some applications, the researches applying fuzzy controller with ASMES have been actively reported. However, it is sometimes very difficult to specify the rule base for some plants, when the parameters change. To solve this problem, a fuzzy model reference learning controller （FMRLC） is proposed in this paper, which investigates multi-input multi-output FMRLC for time-variant nonlinear system. This control method provides the motivation for adaptive fuzzy control, where the focus is on the automatic online synthesis and tuning of fuzzy controller parameters （i.e., using online data to continually learn the fuzzy controller that will ensure that the performance objectives are met）. Simulation results show that the proposed robust controller is able to work with nonlinear and nonstationary power system （i.e., single machine-infinite bus （SMIB） system）, under various fault conditions and disturbances.

关键词： Transient power system stability and robustness single machine-infinite bus (SMIB) system flexible alternating currenttransmission system (FACTS) advanced super-conducting magnetic energy storage (ASMES) fuzzy model reference learning controller(FMRLC) adaptive control learning controller.

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Ru/NiMnB spherical cluster pillar for highly proficient green hydrogen electrocatalyst at high current density

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Journal of Energy Chemistry 2025年第1期100卷 397-408页

作者： Md Ahasan habib Shusen Lin Mehedi Hasan Joni Sumiya Akter Dristy Rutuja Mandavkar Jae-Hun Jeong Jihoon Lee Department of Electronic Engineering College of Electronics and Information Kwangwoon University

Advanced OER/HER electrocatalytic alternatives are crucial for the wide adaptation of green hydrogen ***,Ru/NiMnB spherical cluster pillar （SCP）,denoted as Ru/NiMnB,is synthesized using a combination of electro-deposition and hydrothermal *** investigation of Ru doping in the NiMnB matrix revealed significant improvements in electrocatalytic *** Ru/NiMnB SCPs demonstrate superior OER/HER activity with low overpotentials of 150 and 103 mV at 50mA/cm2in 1 M KOH,making them highly competitive with state-of-the-art ***,the Ru/NiMnB SCPs exhibit a low 2-E cell voltage of 2.80 V at ultra-high current density of 2,000 m A/cm2in 1 M KOH,outperforming the standard benchmark electrodes of RuO2||Pt/C,thereby positioning Ru/NiMnB as one of the best bifunctional *** SCPs exhibit exceptional high-current characteristics,stability and corrosion resistance,as evidenced by continuous operation at 1,000 mA/cm2high-current density for over 150 h in 6 M KOH at elevated temperatures under harsh industrial *** a small amount of Ru incorporation significantly enhances the electrocatalytic performances of NiMnB,attributed to increased active sites and improved intrinsic properties such as conductivity,adsorption/desorption capability and reaction ***,Ru/NiMnB SCPs present a promising bi-functional electrode concept for efficient green H2production.

关键词： Advanced electrocatalyst High current Corrosion resistance Industrial requirement

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Pseudo-linear inertial navigation algorithm

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Chinese Journal of Aeronautics 2021年第2期34卷 191-200页

作者： habib GHANBARPOURASL Department of Mechcitronics University of Turkish Aeronautical AssociationAnkara 06790Turkey

A new method is illustrated for processing the output of a set of triad orthogonal rate gyros and accelerometers to reconstruct vehicle navigation parameters(attitude, velocity, and position). The paper introduces two vectors with dimensions 4×1 as velocity and position *** navigation equations for strapdown systems are nonlinear but after using these parameters, the navigation equations are converted into a pseudo-linear system. The new set of navigation equations has an analytical solution and the state transition matrix is used to solve the linear timevarying differential equations through time series. The navigation parameters are updated using the new formulation for strapdown navigation equations. Finally, the quaternions of velocity and position are converted into the original position and velocity vectors. The combination of the coning motion and a translational oscillatory trajectory is used to evaluate the accuracy of the proposed algorithm. The simulations show significant improvement in the accuracy of the inertial navigation system, which is achieved through the mentioned algorithm.

关键词： Inertial navigation algorithm Integrating algorithm Position quaternion Pseudo-linear inertial navigation equation Quaternions Velocity quaternion

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Phylogenetic and morphometric relationships between two species of genus Auxis from the South China Sea and Java Sea

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Acta Oceanologica Sinica 2016年第10期35卷 76-82页

作者： habib Ahasan Environmental and Life Sciences Programme Faculty of ScienceUniversiti Brunei DarussalamJalan TungkuGadong BE 1410Brunei Darussalam Department of Fisheries and Marine Science Noakhali Science and Technology UniversitySonapur-3814NoakhaliBangladesh Universiti Teknologi Brunei Jalan TungkuGadong BE 1410Brunei Darussalam

This study was aimed at examining the phylogenetic and morphometric relationship of frigate tuna（Auxis thazard） and bullet tuna（Auxis rochei） using mt DNA D-loop（control） region sequences and truss measurements,respectively. Maximum-likelihood（ML） tree and median-joining network showed that haplotypes from Auxis populations grouped separately. Discriminant function analyses and non-metric multidimensional scaling of morphometric data showed that bullet and frigate tuna were differed mainly with respect to truss measurements on the anterior region, suggesting adaptation to different diets available in different environments. Historic demographic analyses of sequence data showed that both bullet and frigate tuna had not undergone a significant sudden population expansion recently. Non-significant value of Tajimas＇ s D and Fu＇s F_S were indicated an effective large and stable population size for longer period of both species in South China Sea and Java Sea species. This study gives first report on the complementary relationship between morphometric and genetic analysis in stock discrimination of genus Auxis.

关键词： phylogenetic relationship mtDNA D-loop morphometric analysis Auxis thazard Auxis rochei

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A BOUNDARY INTEGRAL METHOD FOR COMPUTING ELASTIC MOMENT TENSORS FOR ELLIPSES AND ELLIPSOIDS

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Journal of Computational Mathematics 2007年第1期25卷 2-12页

作者： habib Ammari HyeonbaeKang HyundaeLee Centre de Mathématiques Appliquées CNRS UMR 7641 and Ecole Polytechnique91128 Palaiseau CedexFrance Department of Mathematical Sciences and RIM Seoul National UniversitySeoul 151-747Korea

The concept of elastic moment tensor occurs in several interesting contexts, in particular in imaging small elastic inclusions and in asymptotic models of dilute elastic composites. In this paper, we compute the elastic moment tensors for ellipses and ellipsoids by using a systematic method based on layer potentials. Our computations reveal an underlying elegant relation between the elastic moment tensors and the single layer potential.

关键词： Elastic moment tensor Explicit formulae Integral equations.

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COUPLING OF FINITE ELEMENT AND BOUNDARY ELEMENT METHODS FOR THE SCATTERING BY PERIODIC CHIRAL STRUCTURES

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Journal of Computational Mathematics 2008年第3期26卷 261-283页

作者： habib Ammari Gang Bao Centre de Mathématiques Appliquées CNRS UMR 7641 Ecole Polytechnique 91128 Palaiseau France Department of Mathematics Michigan State University East Lansing MI 48824 USA

Consider a time-harmonic electromagnetic plane wave incident on a biperiodic structure in R^3. The periodic structure separates two homogeneous regions. The medium inside the structure is chiral and nonhomogeneous. In this paper, variational formulations coupling finite element methods in the chiral medium with a method of integral equations on the periodic interfaces are studied. The well-posedness of the continuous and discretized problems is established. Uniform convergence for the coupling variational approximations of the model problem is obtained.

关键词： Chiral media Periodic structures Finite element method Boundary element method Convergence

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Minimum-Time and Minimum-Jerk Gait Planning in Joint Space for Assistive Lower Limb Exoskeleton

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Journal of Bionic Engineering 2023年第5期20卷 2164-2178页

作者： habib Mohamad Sadjaad Ozgoli Fadi Motawej Department of Electrical and Computer Engineering Tarbiat Modares UniversityTehran14117-13116Iran Department of Mechatronics Engineering Tishreen UniversityLattakia0096341Syria

Assistive lower limb exoskeleton robot has been developed to help paraplegic patients walk again.A gait planning method of this robot must be able to plan a gait based on gait parameters,which can be changed during the stride according to human intention or walking *** gait is usually planned in cartesian space,which has shortcomings such as singularities that may occur in inverse kinematics equations,and the angular velocity of the joints cannot be entered into the ***,it is vital to have a gait planning method in the joint *** this paper,a minimum-time and minimum-jerk planner is proposed for the robot *** do so,a third-order system is defined,and the cost function is introduced to minimize the jerk of the joints throughout the *** minimum time required is calculated to keep the angular velocity trajectory within the range specified by the motor’s maximum *** conditions of the joints are determined to secure backward balance and fulfill gait ***,the proposed gait planning method is tested by its implementation on the Exoped®exoskeleton.

关键词： Bionic robot Gait planning Optimization Complete paraplegic Lower limb exoskeleton

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Investigation on the Local Scour Beneath Piggyback Pipelines Under Clear-Water Conditions

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China Ocean Engineering 2021年第3期35卷 422-431页

作者： Sahar ASRARI habib HAKIMZADEH Nazila KARDAN Faculty of Civil Engineering Sahand University of TechnologySahandIran Department of Civil Engineering Azarbaijan Shahid Madani UniversityTabrizIran

A piggyback pipeline consists of two pipes such that the secondary line rides on the main pipe with a fixed distance between two pipes in *** novel strategy is utilized in offshore areas instead of a single flow *** this regard,there are only a handful of experimental and numerical studies investigating the effect of scour below a piggyback pipeline under steady ***,this study focuses on examining the influential factors on scouring due to steady current including the pipe diameter and the gap between pipes through numerical simulations and experimental ***,at the first phase of the research,a single pipe was established and tested in laboratory to compare the results with those of an empirical *** finishing experimental verifications,piggyback pipelines were also assembled to study the scouring under steady current *** was concluded that by increasing the gap distance between the pipes,the maximum scour depth decreases;however,an increase in the small pipe’s diameter results in a larger maximum scour ***,numerical simulations were carried out using the FLOW-3D software which was found to be a suitable tool for the numerical investigation of this ***,the numerical results have been compared with the corresponding experimental data and a relatively good agreement was achieved between them.

关键词： local scour piggyback pipeline scour depth numerical simulation

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Problem with Critical Sobolev Exponent and with Weight

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Chinese Annals of Mathematics,Series B 2007年第3期28卷 327-352页

作者： Rejeb HADIJI habib YAZIDI UFR des Sciences et Technologic CNRS UMR 8050Université Paris 12-Val-de-Marne61avenue du Général de Gaulle94010 Créteil CedexFrance.

The authors consider the problem：-div（p△u）=u^q-1＋λu,u〉0 in Ωmu=0 on эΩ,where Ω is a bounded domain in R^n,n≥3,p：^-Ω→R is a given positive weight such that p∈H^1（Ω）∩С（^-Ω）,λ is a real constant and q=2n/n-2,and stydu the effect of the behavior of p near its minima and the impact of the geometry of domain on the existence of solutions for the above problem.

关键词： Critical Sobolev exponent Variational methods

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SENSITIVITY ANALYSIS WITH RESPECT TO THE ELECTRICAL CONDUCTIVITY

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Journal of Computational Mathematics 2007年第3期25卷 244-251页

作者： habib Ammari Cedex France Hyeonbae Kang Centre de Mathématiques Appliquées CNRS UMR 7641 and Ecole Polytechnique91128 Palaiseau School of Mathematical Sciences Seoul National UniversitySeoul 151-747Korea Habib Zribi Centre de Mathématiques AppliquéesCNRS UMR 7641 and Ecole Polytechnique91128 Palaiseau CedexFrance

In this paper, we consider conductivity inclusions inside a homogeneous background conductor. We provide a complete asymptotic expansion of the solution of such problems in terms of small variations in the electrical conductivity of the inclusion. Our method is based on a boundary integral perturbation theory. Our results are valid for both high and low contrast inclusions.

关键词： High contrast material Full-asymptotic expansions Boundary integral equa-tion.

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