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4,094 results on '"A. Cheikhrouhou"'

160. High Boron Content Enhances Bioactive Glass Biodegradation

Author

Amina Gharbi, Hassane Oudadesse, Hafedh el Feki, Wissem Cheikhrouhou-Koubaa, Xanthippi Chatzistavrou, Julietta V. Rau, Jyrki Heinämäki, Iulian Antoniac, Nureddin Ashammakhi, and Nabil Derbel

Subjects
borosilicate bioactive glass, boron, degradation, physico-chemical characterizations, hydroxyapatite layer, Biotechnology, TP248.13-248.65, Medicine (General), R5-920
Abstract

Derived Hench bioactive glass (BaG) containing boron (B) is explored in this work as it plays an important role in bone development and regeneration. B was also found to enhance BaG dissociation. However, it is only possible to incorporate a limited amount of B. To increase the amount of B in BaG, bioactive borosilicate glasses (BaG-Bx) were fabricated based on the use of the solution-gelation process (sol-gel). In this work, a high B content (20 wt.%) in BaG, respecting the conditions of bioactivity and biodegradability required by Hench, was achieved for the first time. The capability of BaG-Bx to form an apatite phase was assessed in vitro by immersion in simulated body fluid (SBF). Then, the chemical structure and the morphological changes in the fabricated BaG-Bx (x = 0, 5, 10 and 20) were studied. The formation of hydroxyapatite (HAp) layer was observed with X-ray diffraction (XRD) and infrared (IR) spectroscopy. The presence of HAp layer was confirmed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Enhanced bioactivity and chemical stability of BaG-Bx were evaluated with an ion exchange study based on Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES) and energy dispersive spectroscopy (EDS). Results indicate that by increasing the concentration of B in BaG-Bx, the crystallization rate and the quality of the newly formed HAp layer on BaG-Bx surfaces can be improved. The presence of B also leads to enhanced degradation of BaGs in SBF. Accordingly, BAG-Bx can be used for bone regeneration, especially in children, because of its faster degradation as compared to B-free glass.

Published
2023
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166. Modelling and Executing Time-Aware Processes in Trustless Blockchain Environment

Author

Abid, Amal, Cheikhrouhou, Saoussen, Jmaiel, Mohamed, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Kallel, Slim, editor, Cuppens, Frédéric, editor, Cuppens-Boulahia, Nora, editor, and Hadj Kacem, Ahmed, editor

Published
2020
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183. Developing a metaheuristic model for the general assembly line balancing optimization based on a new workforce performance index: a case study in the garment industry.

Author

Chourabi, Zouhour, Khedher, Faouzi, Babay, Amel, and Cheikhrouhou, Morched

Subjects
ASSEMBLY line balancing, ANT algorithms, ASSEMBLY line methods, MANUFACTURING processes, CLOTHING industry
Abstract

In garment industries, it is very important to assign fairly workers and tasks to the stations of an assembly line while the precedence relations and resource constraints are satisfied. Many objectives were treated to optimize the working group selection, but consider objectively the workers skills to judge the balancing effectiveness are still non-existent. This paper proposes a new approach for solving the Assembly Line Balancing Problem with workers' competence hierarchical assignment using the ant colony optimization. According to this approach, the workforce's performance index is appreciated with a global Competence Index 'CIg' developed on the basis of measurable criteria to rank hierarchically the workers. The global Competence Index 'CIg' is designed integrating 3 objective criteria: global Quality index 'QIg', global Activity degree 'Ag' and global Attendance Rate 'ARg', which are related to 3 parameters expressing, respectively, the work quality degree, the labour efficiency level and the assiduity for a working group. The global Competence Index is considered as a new 'objective function' for the ant colony optimization algorithm called 'ACO−CIg'. The aim is to find the best solution assigning workers and tasks to an assembly line stations so that the global competence index is maximized. The results showed that the algorithm implementation was useful in real manufacturing process dealing with hierarchical workforce assignments in a reasonable time and allowing to select the best balancing solution, hence, to predict and control the production line's performance. [ABSTRACT FROM AUTHOR]

Published
2024
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199. What about breastfeeding in diabetic women?

Author

Sdiri, Chaima, primary, Abdesselem, Haifa, additional, Bornaz, Emna, additional, Cheikhrouhou, Mariem, additional, Boukhayatia, Fatma, additional, Ben, Brahim Asma, additional, Yahyaoui, Rim, additional, Ounaissa, Kamilia, additional, and Amrouche, Chiraz, additional

Published
2024
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