Vector Control of Asynchronous Motor of Drive Train Using Speed Controller H∞

This study proposes the speed control of an asynchronous motor (AM) using the Antiwindup design. First, the conventional vector control based on proportional-integral (PI) controllers is developed for a constant speed set point. Then, a driving cycle is based on measurements on the Safi/Rabat motorway in Morocco using a microcontroller equipped with a GPS device. The collected practical speed is used as a speed reference for conventional vector control. The /Antiwindup controller of the direct rotor flow-oriented control is used to improve the performance of conventional vector control and optimize the energy consumption of the drive train. The effectiveness of the proposed control scheme is verified by numerical simulation. The results of the numerical validation of the proposed scheme showed good performance compared to conventional vector control. The speed control systems are analyzed for different operating conditions. These control strategies are simulated in the MATLAB/SIMULINK environment. The simulation results of the improved vector control of the Asynchronous Machine (AM) are used to validate this optimization approach in the dynamic regime, followed by a comparative analysis to evaluate the performance and effectiveness of the proposed approach. A practical model based on a TMS320F28379D embedded board and its reduced voltage inverter (24V) is used to implement the proposed method and verify the simulation results. Doi: 10.28991/ESJ-2022-06-04-012 Full Text: PD

SOR-Like New Iterative Method for Solving the Epidemic Model and the Prey and Predator Problem

Our aim in this paper is to propose an SOR-like new iterative method by introducing a relaxation parameter ω to improve the new iterative method proposed by Daftardar-Gejji and Jafari (NIM) [J. Math. Anal. Appl. 316 (2006) 753–763] in order to solve two problems. The first one is the problem of the spread of a nonfatal disease in a population which is assumed to have constant size over the period of the epidemic, and the other one is the problem of prey and predator. The proposed method is not limited to these two problems but can be applicable to a wide range of systems of nonlinear functional problem. The results, for different values of ω, show that we found some known methods and our method compared to methods using the calculation of special polynomials and derivatives like the Adomian decomposition method (ADM), the calculation of the Lagrange multiplier as in the variational iterative method (VIM), or the construction of a homotopy as in the homotopy perturbation method (HPM) has several advantages, such as very effective and very simple to implement. Unfortunately, these methods do not guarantee a valid approximation in large time interval. To overcome this, we applied our method for approximating the solution of the problems in a sequence of time intervals as a multistage approach. Some numerical results are presented with plots according to the parameter ω

Application of solid-phase microextraction-gas chromatography-mass spectrometry to characterize intermediates in a joint solar-microbial process for total mineralization of Aroclor 1254

NRC publication: Ye

Application of solid-phase microextraction-gas chromatography-mass spectrometry to characterize intermediates in a joint solar-microbial process for total mineralization of Aroclor 1254

NRC publication: Ye

Tuberculome myocardique: localisation inhabituelle de la tuberculose à propos d’une nouvelle observation avec une revue de la littérature

Nous rapportons l’observation d’un patient de 50 ans présentant une masse tumorale du ventricule gauche évoluant dans un contexte d’altération de l’état général et de fièvre. Cette masse a été objectivée par l’échocardiographie réalisée pour l’exploration d’une cardiomégalie radiologique. L’aspect en imagerie par résonance magnétique était évocateur d’un tuberculome intra myocardique. A travers notre observation, nous proposons une revue de la littérature sur cette localisation inhabituelle de la tuberculose.The Pan African Medical Journal 2016;2

Joint Solar/Microbial Process for Mineralization of PCBs

NRC publication: Ye

Remote Laboratory in Control Process during COVID-19 Pandemic Situation

Today we are witnessing an unprecedented pandemic called the "COVID-19 pandemic" which has created the greatest disruption to education systems in human history. It has caused the closure of schools, institutions and other learning spaces, causing profound changes in all aspects of our lives. Policies of social distancing and restriction of movement have significantly disrupted traditional educational practices. Faced with this problem, it is time to innovate and implement an alternative education system and assessment strategies. The work presented in this paper responds to this problem and aims to provide a practical work environment which allows engineers to complete their basic training with the use, control and handling of measuring instruments often used in the real world. This environment will therefore be accessible online and makes it possible to control the process

Exploration des liens théorie-pratique établis par des stagiaires en enseignement dans des incidents critiques : vers une catégorisation des sources et des types de savoirs mobilisés

L’articulation théorie-pratique demeure complexe pour les étudiants en formation initiale en enseignement. L’évaluation de la mise en oeuvre d’une nouvelle modalité de stage révèle que divers acteurs impliqués dans les stages perçoivent plus de liens théorie-pratique dans les travaux des étudiants. Or, cette évaluation n’a pas permis de décrire la nature de ces liens. Cette recherche explore la façon dont les étudiants intègrent ces liens dans un travail réalisé durant leur stage : l’incident critique. Une analyse thématique montre les sources et les types de savoirs convoqués dans ces travaux.The theory-practice articulation remains complex for teacher candidates in initial teacher education. The evaluation of the implementation of a new practicum modality reveals that various actors involved in practicum placements perceive more theory-practice links in teacher candidates’ work. However, this evaluation did not make it possible to describe the nature of these links. This research explores how students integrate these links into a written work they do during their internship: critical incident. A thematic analysis highlights the sources and types of knowledge concretely called upon in this work

Biobarrier stability lab-scale studies for treatment of hydrocarbon-contaminated groundwater

NRC publication: Ye