11 research outputs found
A New MPPT-Based Extended Grey Wolf Optimizer for Stand-Alone PV System: A Performance Evaluation versus Four Smart MPPT Techniques in Diverse Scenarios
Photovoltaic (PV) systems play a crucial role in clean energy systems. Effective maximum power point tracking (MPPT) techniques are essential to optimize their performance. However, conventional MPPT methods exhibit limitations and challenges in real-world scenarios characterized by rapidly changing environmental factors and various operating conditions. To address these challenges, this paper presents a performance evaluation of a novel extended grey wolf optimizer (EGWO). The EGWO has been meticulously designed in order to improve the efficiency of PV systems by rapidly tracking and maintaining the maximum power point (MPP). In this study, a comparison is made between the EGWO and other prominent MPPT techniques, including the grey wolf optimizer (GWO), equilibrium optimization algorithm (EOA), particle swarm optimization (PSO) and sin cos algorithm (SCA) techniques. To evaluate these MPPT methods, a model of a PV module integrated with a DC/DC boost converter is employed, and simulations are conducted using Simulink-MATLAB software under standard test conditions (STC) and various environmental conditions. In particular, the results demonstrate that the novel EGWO outperforms the GWO, EOA, PSO and SCA techniques and shows fast tracking speed, superior dynamic response, high robustness and minimal power fluctuations across both STC and variable conditions. Thus, a power fluctuation of 0.09 W could be achieved by using the proposed EGWO technique. Finally, according to these results, the proposed approach can offer an improvement in energy consumption. These findings underscore the potential benefits of employing the novel MPPT EGWO to enhance the efficiency and performance of MPPT in PV systems. Further exploration of this intelligent technique could lead to significant advancements in optimizing PV system performance, making it a promising option for real-world applications.The authors wish to express their gratitude to the Basque Government, through the project EKOHEGAZ II (ELKARTEK KK-2023/00051); to the DiputaciĂłn Foral de Ălava (DFA), through the project CONAVANTER; and to the UPV/EHU, through the project GIU20/063 for supporting this work
Dermatofibrosarcome de Darier et Ferrand: Ă propos de 38 cas
Le dermatofibrosarcome protubérans de Darier et Ferrand est une tumeur cutanée rare. Le but de cette étude est de décrire les aspects épidémiologiques, cliniques, histologiques, thérapeutiques et évolutifs avec comparaison aux données de la littérature. Il s'agissait d'une étude rétrospective sur 10 ans à propos de 38 cas de dermatofibrosarcome de Darier et Ferrand pris en charge à l'Institut National d'Oncologie. Les données épidémiologiques, diagnostiques, thérapeutiques et évolutives ont été recueillies à partir des dossiers cliniques des patients et rapportées sur une fiche préétablie. L'ùge médian des patients était de 41,5 ans. Tous les patients avaient une preuve histologique de dermatofibrosarcome. Seulement 30 patients ont été traités à l'Institut National d'Oncologie. L'exérÚse chirurgicale de la tumeur était large, avec des marges de sécurité de 6-10 cm chez 6 patients (20%), 5 cm chez 16 patients (53%), 2-3 cm chez 4 patients (13%). En profondeur, l'exérÚse emportait une barriÚre anatomique saine. 5 malades ont bénéficié d'une radiothérapie externe avec une dose médiane de 59,5 Gy. Le recul médian était de 64,4 mois (28- 138 mois). Le dermatofibrosarcome protubérans de Darier et Ferrand est une tumeur se distinguant par son évolution lente, son agressivité locale, son haut pouvoir de récidive et la rareté des métastases. Le traitement consiste en une exérÚse large et profonde. Le pronostic dépend essentiellement de la qualité de l'exérÚse initiale chirurgicale. La série étudiée présente des similitudes épidémiologiques, cliniques, et thérapeutiques avec les données de la littérature
Clear cell sarcoma of tendons and aponeuroses of the parapharyngeal space: an unusual localization of a rare tumor (a case report and review of the literature)
The clear cell sarcoma of tendons and aponeuroses (CCSTA) is a rare soft tissue sarcoma in the head and neck region and parapharyngeal space. Over 95% of CCSTAs present in the extremities, with the head and neck region (1.9%) being an unusual site. This study presents an additional case of CCSTA of the head and neck region involving the parapharyngeal space in a 48-year-old men and review of the literature on CCSTA. Key words: Clear cell, sarcoma, rare, parapharyngeal spac
Le DERMATOFIBROSARCOME DE DARIER ET FERRAND: expĂ©rience de lâinstitut national dâoncologie a propos de 38 cas : caracteristiques epidemiologiques, cliniques, diagnostiques, therapeutiques et evolutives
Individualisé comme une véritable entité anatomo-clinique en 1924 par Darier et Ferrand, le dermatofibrosarcome protubérans est une tumeur cutanée rare, à malignité essentiellement locale, se distinguant par son évolution lente, sa difficulté diagnostique, son agressivité locale, son haut pouvoir de récidive et la rareté des métastases.
AprĂšs avoir Ă©tudiĂ© en dĂ©tails le dermatofibrosarcome de Darier et Ferrand, nous rapportons lâexpĂ©rience de lâinstitut national dâoncologie âI.N.Oâ par une Ă©tude rĂ©trospective de 38 cas sur 10 ans de 2000 Ă 2009 et nous lâanalysons comparativement aux diffĂ©rents sĂ©ries recensĂ©s dans la littĂ©rature.
La série étudiée présente des similitudes épidémiologiques, cliniques, histologiques, thérapeutiques et évolutives avec les données de la littérature.
Le DFS touche essentiellement lâadulte jeune avec une lĂ©gĂšre prĂ©dominance masculine.
Lâaspect clinique de la tumeur est variable, allant dâun simple nodule Ă une tumeur volumineuse ulcĂ©rĂ©e ou hĂ©morragique.
Lâhistologie est lâexamen clĂ© du diagnostic. Lâimmunohistochimie confirme le diagnostic en cas de doute histologique facilitant ainsi le diagnostic diffĂ©rentiel.
Son traitement est chirurgical, il consiste en une exĂ©rĂšse large et profonde avec sacrifice dâune barriĂšre anatomique saine.
Son pronostic dĂ©pend avant tout de la qualitĂ© de lâexĂ©rĂšse initiale chirurgicale.
Compte tenue du fort potentiel de récidive et du risque métastatique, une surveillance à vie est nécessaire
Place de la radiothérapie dans les séminomes testiculaires de stade I: à propos de 25 cas
Notre travail se proposait de rapporter les rĂ©sultats dâune Ă©tude rĂ©trospective, descriptive, portant sur 25 sĂ©minomes testiculaires de stade I et de prĂ©ciser la place de la radiothĂ©rapie dans la prise en charge de cette entitĂ©. Entre janvier 2001 et dĂ©cembre 2009, 25 patients atteints d'un sĂ©minome testiculaire de stade I ont Ă©tĂ© pris en charge au service de radiothĂ©rapie de lâinstitut national dâoncologie de Rabat. Lâorchidectomie premiĂšre a Ă©tĂ© rĂ©alisĂ©e par voie inguinale. Le bilan dâextension initial comportait un dosage de bHCG totale, dâalphafoetoprotĂ©ine, et une exploration des aires ganglionnaires sus- et sous-diaphragmatiques par une tomodensitomĂ©trie. Lâirradiation adjuvante a Ă©tĂ© dĂ©livrĂ©e au moyen dâun accĂ©lĂ©rateur linĂ©aire. L'Ăąge mĂ©dian est de 33 ans (18-52 ans). La tumeur testiculaire siĂ©geait Ă droite chez 16 malades et Ă gauche chez les 9 autres. La radiothĂ©rapie Ă©tait dĂ©livrĂ©e dans les aires ganglionnaires lomboaortiques pour 18 patients, lomboaortiques et iliaques homolatĂ©rales pour les 7 autres et ceci par deux faisceaux antĂ©ropostĂ©rieurs, dĂ©livrant une dose de 20 Ă 25 Gy en 10 Ă 14 fractions. La tolĂ©rance immĂ©diate Ă©tait excellente. La durĂ©e mĂ©diane de surveillance Ă©tait de 73 mois. Vingt trois patients sont actuellement vivants, en situation de rĂ©mission complĂšte. Un patient a rechutĂ© au niveau pulmonaire 22 mois aprĂšs la fin de sa radiothĂ©rapie. Un patient a Ă©tĂ© perdu de vue. Il nâa pas Ă©tĂ© observĂ© de toxicitĂ© Ă long terme, en particulier gastro-intestinale. Aucune tumeur ou pathologie hĂ©matologique secondaire nâa Ă©tĂ© rapportĂ©e. La radiothĂ©rapie prophylactique reste le traitement adjuvant de rĂ©fĂ©rence des sĂ©minomes de stade I. La tolĂ©rance immĂ©diate est satisfaisante et lâaugmentation du risque de cancer secondaire est nĂ©gligeable par rapport au bĂ©nĂ©fice thĂ©rapeutique. Toutefois une surveillance armĂ©e ainsi quâune chimiothĂ©rapie adjuvante avec un cycle de carboplatine sont aussi efficaces.The Pan African Medical Journal 2016;2
Physico-mechanical characterization of composite cementitious mortars modified by resin containing antifoam
Nowadays, polymer-modified mortars (PMM) are generally used in the field of building as finishing materials. In general, The properties of the fresh and hardened PMC are affected by several factors that tend to interact each other: the nature of materials used as latex, cement and aggregates; the mix proportions (W/C, polymer/cement ratio, etc.); air content; type and amount of surfactants and anti-foaming; and curing methods. This present experimental work aims to study the influence of the rate of partial substitution of cement by resin containing anti-foaming on the properties of composite mortars in the fresh and hardened state particularly workability, tensile and compressive strengths at different times (3, 7 and 28 days) and module of static elasticity at 28 days. For that purpose, seven mortar combinations were developed from the various substitution percentages (0 to 15% by step of 2.5%). The treatment of the obtained results reveals that this partial replacement of the cement by resin improves, clearly, the workability of mortars and decreases the report W/C at the same time. Besides, the incorporation of resin affects significantly the mechanical strengths, and consequently, the addition by substitution of the polymer-latex improves, slightly, the mechanical behavior in tensile where the rates of increase range from 2.20% to 8.54% for replacement percentages of 2.5% and 15%, respectively. Furthermore, the compressive strengths of cement - resin composite mortars are lower compared to the reference mortar made with the cement Portland (CEM I). The notable decrease in compressive strength of polymerâmodified mortars can be justified by the reduction of cementitious part, in hybrid materials, which is an indispensable and responsible part of improving compressive strength
Isolation and Characterization of Bacteriocinogenic Enterococcal and Lactococcal Strains from South of Morocco Dairy Product
Aim: To investigate the occurrence of bacteriocinogenic lactic acid bacteria (BAL) in different animalâs milk of the south of Morocco.
Place and Duration of Study: Laboratory of Microbial biotechnologies and plant Protection, Faculty of Sciences, and Bioprocess and Environment laboratory (LASIME), EST-Agadir, Ibnou Zohr University, Agadir, Morocco, between January 2014 and January 2016.
Methodology: A total of 2000 different colonies, isolated from 42 samples of dromedary, eweâs, goat and cow spontaneously fermented milk collected from some southern regions of Morocco, were tested for antimicrobial activity. Three indicator strains were used; Listeria innocua, Bacillus subtilis and Enterococcus hirae. The selected strains are phenotypically and biochemically identified, especially by API 20 Strep galleries. In addition, the sanitary and technological aspects of these strains are studied.
Results: Among the active strains 150 strains were selected, and 91% among them were identified as lactic acid bacteria. Out of these, 11 strains isolated from dromedary and eweâs milk are shown to be active by the agar well diffusion assay (AWDA). Seven (7) strains were identified as Enterococcus faecium, three (3) as Enterococcus faecalis and only one (1) strain was identified as Lactococcus lactis. The twelve strains are active against a wide range of pathogenic and spoilage bacteria, including Listeria monocytogenes, Staphylococcus aureus and Escherichia coli. In addition, all of these strains shown to lack haemolytic, decarboxylatic, proteolytic and lipolytic activities and to be susceptible to most tested antibiotics.
Conclusion: These results suggest a potential application of isolated strains of lactic acid bacteria in bio-preservation of fermented foods especially dairy products
Clear cell sarcoma of tendons and aponeuroses of the parapharyngeal space: an unusual localization of a rare tumor (a case report and review of the literature) Case report Open Access
Abstract The clear cell sarcoma of tendons and aponeuroses (CCSTA) is a rare soft tissue sarcoma in the head and neck region and parapharyngeal space. Over 95% of CCSTAs present in the extremities, with the head and neck region (1.9%) being an unusual site. This study presents an additional case of CCSTA of the head and neck region involving the parapharyngeal space in a 48-year-old men and review of the literature on CCSTA