Synthèse


Description

La revue « Synthèse » des Sciences et de la Technologieest un journal semestriel à vocation internationale. Elle est éditée par la Direction des Publications de l’Université Badji Mokhtar de Annaba (Algérie) depuis 1995. Synthèse est pluridisciplinaire . Elle englobe les Sciences Exactes, les Sciences de la Nature et de la Vie, les Sciences Médicales, les Sciences de la Terre, l’Architecture, et les Sciences de l’Ingénieur. Synthèse offre un espace de publication à des articles scientifiques originaux valorisant la recherche scientifique. Les manuscrits peuvent être soumis en Anglais en Français et en Arabe. Le comité scientifique international, composé de spécialistes dans les divers domaines est, progressivement, enrichi par les différents comités de rédaction successifs. Les expertises font appel à des compétences de diverses institutions nationales et internationales. Les experts ont la pleine autorité pour accepter, réviser ou rejeter l’article soumis. La décision finale est, ensuite, prise, par le comité de rédaction, sur la base de deux expertises de même ordre. Temps moyen d'acceptation: 60% Temps moyen de réponse: 2,5 mois (75 jours) Temps moyen de publication après acceptation : 2 mois Politique de Publication Politique de diffusion Publication en libre accès Licence de la revue: Creative Commons-Attribution 4.0 Unported-CC By 4.0 Politique sur les frais de publication Frais de publication: non Frais de soumission: non Politique d’évaluation Procédure d’évaluation: évaluation évaluation par les pairs Délai moyen entre soumission et publication: 20 semaines Procédures de recevabilité et d’expertise des articles soumis Avant le processus d’expertise, les articles soumis doivent vérifier les critères de recevabilité suivants: Le thème proposé relève d’un des domaines couverts par la revue Le scan du document par un logiciel anti-plagiat Le respect des instructions aux auteurs Les articles conformes sont ensuite envoyés de manière anonyme aux experts dont l’affiliation est différente de celle des signataires de l’article. Il est demandé aux experts de transmettre leurs rapports dans un délai de 4 semaines. L’acceptation de l’article est acquise après obtention de deux réponses favorables (et après correction du document par les auteurs et levée des réserves par les experts). En cas de réponses contradictoires, un troisième expert est désigné et sa décision est tranchante ; il en va de même, en cas de litige entre les auteurs et les experts. Les décisions finales accompagnant les rapports détaillés sont: (i) accepté, (ii) accepté après révisions mineures, (iii) accepté après révisions majeures, (iv) rejeté sous la forme actuelle ou (v) rejeté pour raison de fond. The Science and Technology Review “Synthèse” is a half-yearly international peer-reviewed journal published by the Directoraty of Publication of the Université Badji Mokhtar-Annaba, (Algeria) since 1996. Synthèse is a multidisciplinary journal. Its scope covers the fields of pure and applied science, natural and life science, medicine, geology, architecture and engineering. It offers a space for publication of original experimental and theoretical research studies as well as review articles. Manuscripts should be submitted in English, French or Arabic. The international scientific committee of Synthèse, made up of specialists, is periodically enriched by successive editorial boards. The manuscripts’ evaluations are assigned to national and international reviewers, each of whom has the full authority to accept, revise or reject the proposed paper. The final decision is taken upon two identical referees’ replies.


29

Volumes

44

Numéros

512

Articles


Surface properties, rheology and thermorheology of octenyl succinic anhydride (OSA) waxy maize starch

Djori Amel,  Moulai-mostefa Nadji, 
2024-06-11

Résumé: The present work aimed to realize a complementary characterization of octenyl succinate anhydride-modified waxy maize starch (OSA WM starch) in terms of surface properties, rheology, and thermorheology. Analyses by conductimetry and measurements of surface tension confirmed the amphiphilc character of the modified polysaccharide. The critical concentration of aggregation was found at a value of 0.1%. At this concentration, the measured surface tension was equal to 54.5 mN/m. In parallel, the rheological and thermorheological behaviors of OSA starch were determined. The model of Herschel-Bulkley was utilized for the evaluation of the rheological parameters. Furthermore, the viscoelasticity study showed that the elastic modulus (G') and the loss modulus (G") were sensitive to the polymer concentration and are dependent of frequency and strain; the modified polysaccharide exhibited seemingly a solid-like behavior (G'>G"). Measurements in oscillation of the effect of temperature showed that from a critical temperature, the system becomes much more elastic. The great increase in elasticity confirms its thermoreversible behavior.

Mots clés: OSA maxy waize starch ; Surface properties ; Morphology ; Viscoelasticity ; Thermorheology


A Numerical Approach of Elasto-Plastic Critical Energy Release Rate (JIC) of HDPE-100 Pipes

Hamlaoui Nacira,  Guidara Mohamed Amine,  Alimi Latifa,  Chaoui Kamel, 
2024-06-11

Résumé: Today, the use of high density polyethylene (HDPE) pipes dominates underground fluid transport sector especially when replacing traditional and costly steel pipes. The failure of polyethylene pipes can occur due to a variety of factors applied external loads, environmental stress cracking, thermal gradients, method of manufacture and service conditions. It is essential to have as complete an understanding as possible of the HDPE fracture behavior. This work is focused to quantify fracture energies of high resistant polyethylene (PE) pipe by finite element method using the J-integral (JIC; kJ/m2) fracture criterion for different length of notch. The initiation of a crack is described by a critical value, JIC and a critical displacement. For each crack depth corresponds a critical displacement.

Mots clés: Polyethylene ; Pipes HDPE ; J-Integral ; ABAQUS


Machine learning prediction of cutting parameters of EN-AW-1350 Aluminum Alloy using regression models

خروف فخر الدين, 
2024-06-11

Résumé: The paper proposes the use of machine learning models to predict the cutting properties when turning EN-AW-1350 aluminum alloy under dry cutting conditions. cutting speeds (m/min), feed rates (mm/rev) and depths of cut (mm) are the main input control parameters selected for the present investigation. The established models can predict the surface roughness values (Ra) during the aluminum hard turning operation, which can guide the direction of experiments and eliminate the need for time-consuming traditional experimental procedures. The prediction performance of six regression methods (Decision Tree (DT), linear regression (LR), eXtreme Gradient Boosting (XGBoost), AdaBoost, Support Vector Machine (SVM) and Random Forest (RF)) were evaluated with a test set/training set ratio of 8 to 2. Among the six regression methods, XGBoost had the best prediction effect on the surface roughness of EN-AW-1350 aluminum alloy with a low mean root mean square error (RMSE) and coefficient of determination (R2) close to 1.

Mots clés: Aluminum alloy ; Machine learning ; Turning ; Surface roughness ; Regression methods


Mechanical and Dielectric Relaxationsi n poly(vinylidenefluoride) PVDFfilms

خميس سفيان,  قاسمي علي,  ديبلي سهى,  جمني فتحي, 
2024-06-13

Résumé: Dielectric and Dynamic Mechanical Spectroscopy, as well as Differential Scanning Calorimetry measurements associated with X-ray diffraction (XRD), were conducted on PVDF films. Several mechanical and dielectric relaxations were observed at approximately -48°C, 84°C and -42°C, 13°C respectively, at a frequency of 1 Hz in unstretched PVDF film. The main objective of this study was to compare the β and α mechanical relaxations and enhance the understanding of the structural changes that occur in the crystalline phase during stretching at various temperatures. Reorientation of the chains and an increase in the degree of crystallinity were observed with stretching at different temperatures.

Mots clés: polymer ; DSC ; Relaxation ; PVDF ; XRD