Codex architectural et palimpseste urbain

Hafida Boulekbache 고려대학교 응용문화연구소 2015 에피스테메 Vol.0 No.14

The architectural compositions are the fruit of time settings andvarious events. They are the legacy of several superimposed layers and /or juxtaposed, and the result of suggestive projects evokes stratifications,which juggling between two time frames; past and present and theformation of urban palimpsest; the city. The architecture is an "intelligible matter" that involves reasoning andinduces to express and show an intentional act, which creates architecturalexpression of a thought, identity, that is, a "trace". The latter allows thearchitect to design and to include an architectural idea that is recognizableand readable through the perception of space and time. Therefore, theperception of architecture evolves to adapt constantly to the newconditions of use. The architecture is a path and an open book to thefuture, but is also a testimony of the past and a memory. Les compositions architecturales sont le fruit de sédimentationd’époques et d’événements divers. Elles sont l’héritage de plusieurscouches superposées et/ou juxtaposées, et résultantes de projetsévocateurs de stratifications jonglant entre deux temporalités ; passé etprésent et formant le palimpseste urbain ; la ville. L’architecture est une « matière intelligible » qui engage le raisonnementet induit de faire connaître et de faire apparaître un fait architecturalintentionnel qui crée l’expression d’une pensée, d’une identité, …, par une« trace». Cette dernière permet à l’architecte de concevoir et d’inscrire uneidée architecturale qui soit discernable, lisible à travers la perception del’espace et du temps. Dès lors, la perception de l’architecture est enperpétuelle évolution pour s’adapter aux nouvelles conditions d’usage. L’architecture est donc un tracé, un livre ouvert vers le futur, maisreprésente aussi un témoignage du passé, une mémoire.

L’ARCHITECTURE : UN ARCHITECTURE PARADIGME DU VISUEL

HAFIDA BOULEKBACHE MAZOUZ 한국영상문화학회 2014 영상문화 Vol.0 No.24

Durability assessments of limestone mortars containing polypropylene fibres waste

Bendjillali, Khadra,Boulekbache, Bensaid,Chemrouk, Mohamed Techno-Press 2020 Advances in concrete construction Vol.10 No.2

The main objective of this study is the assessment of the ability of limestone mortars to resist to different chemical attacks. The ability of polypropylene (PP) fibres waste used as reinforcement of these concrete materials to enhance their durability is also studied. Crushed sand 0/2 mm which is a fine limestone residue obtained by the crushing of natural rocks in aggregates industry is used for the fabrication of the mortar. The fibres used, which are obtained from the waste of domestic plastic sweeps' fabrication, have a length of 20 mm and a diameter ranging between 0.38 and 0.51 mm. Two weight fibres contents are used, 0.5 and 1%. The durability tests carried out in this investigation included the water absorption by capillarity, the mass variation, the flexural and the compressive strengths of the mortar specimens immersed for 366 days in 5% sodium chloride, 5% magnesium sulphate and 5% sulphuric acid solutions. A mineralogical analysis by X-ray diffraction (XRD) and a visual inspection are used for a better examination of the quality of tested mortars and for better interpretation of their behaviour in different solutions. The results indicate that the reinforcement of limestone mortar by PP fibres waste is an excellent solution to improve its chemical resistance and durability. Moreover, the presence of PP fibres waste does not affect significantly the water absorption by capillarity of mortar nether its mass variation, when exposed to chloride and sulphate solutions. While in sulphuric acid, the mass loss is higher with the presence of PP fibres waste, especially after an exposure of 180 days. The results reveal that these fibres have a considerable effect of the flexural and the compressive behaviour of mortar especially in acid solution, where a reduction of strength loss is observed. The mineralogical analysis confirms the good behaviour of mortar immersed in sulphate and chloride solutions; and shows that more gypsum is formed in mortar exposed to acid environment causing its rapid degradation. The visual observation reveals that only samples exposed to acid attack during 366 days have showed a surface damage extending over a depth of approximately 300 ㎛.

Interfacial stresses in damaged RC beams strengthened by externally bonded prestressed GFRP laminate plate: Analytical and numerical study

Chergui, Selma,Daouadji, Tahar Hassaine,Hamrat, Mostefa,Boulekbache, Bensaid,Bougara, Abdelkader,Abbes, Boussad,Amziane, Sofiane Techno-Press 2019 Advances in materials research Vol.8 No.3

In this study, the interfacial stresses in RC beams strengthened by externally bonded prestressed GFRP laminate are evaluated using an analytical approach, based on the equilibrium equations and boundary conditions. A comparison of the interfacial stresses obtained from the present analytical model and other existing models is undertaken. Otherwise, a parametric study is conducted to investigate the effects of geometrical and material properties on the variation of interfacial stresses in damaged RC beams strengthened by externally bonded prestressed GFRP laminate. The results obtained indicate that the damage degree has little effect on the maximum shear stress, with a variation less than 5% between the damaged and undamaged RC beams. However, the results also reveal that the prestressing level has a significant effect on the interfacial stresses; hence the damaged RC beam strengthened with an initial prestressing force of 100 kN gives 110% higher maximum shear stress than the damaged RC beam strengthened with an initial prestressing force of 50 kN. The values of shear stress obtained by the analytical approach are approximately equal to 44% of those obtained from the numerical solution, while the interfacial normal stresses predicted by the numerical study are approximately 26% higher than those calculated by the analytical solution.

Ethnobotanical survey of medicinal plants of bejaia localities from algeria to prevent and treat coronavirus (COVID-19) infection shortened title: phytomedicine to manage COVID-19 pandemic

Fatiha Brahmi,Yassmina Iblhoulen,Hanane Issaadi,Mahmoud Fahmi Elsebai,Khodir Madani,Lila Boulekbache-Makhlouf 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.3

The propagation of the COVID-19 pandemic in Algeria has pushed the population searching alternative therapies as preventives and treatment selections. The use of medicinal plants is a promising alternative solution to strengthen immunity and chase COVID-19. The aim of this study was to carry out an ethnobotanical survey in the Bejaia department (Algeria) to identify the plants used during the current pandemic. The study was conducted from February to May 2021. The interviews were conducted with 400 informants in order to assemble socio-demographic and foristic features of the respondents and used plants. The data analysis was performed by means of Relative Frequency of Citation (RFC), Family Importance Value (FIV), and Plant Part Value (PPV). 23 medicinal plants belonging to 12 families were adopted by the population of the Bejaia localities to prevent and treat COVID-19 infection. Aloysia citriodora Palau (RFC=0.248), Mentha spicata L. (RFC=0.145), Citrus limon (L.) Osbeck (RFC =0.135), Thymus vulgaris L. (RFC=0.118), Zingiber ofcinalis Roscoe (RFC =0.09), Artemisia herba-alba Asso (RFC=0.065), and Eucalyptus globules labill (RFC=0.063) were the most cited species. The leaves of these plants which are used (65%) in the form of infusion (43.6%) are administered orally (95.03%) to treat and relieve certain symptoms of COVID-19. The current survey is the only one in the Bejaia department regarding the exploitation of medicinal herbs in the COVID-19 pandemic. These plants can be used as a platform to manage COVID-19.

Effect of storage on bioactivity of an Algerian spice “paprika”: optimization of phenolic extraction and study of antioxidant and antibacterial activities

Keltoum Bouziane-Ait Bessai,Nabila Brahmi-Chendouh,Fatiha Brahmi,Sofiane Dairi,Khokha Mouhoubi,Ferriel Kermiche,Kenza Bedjaoui,Khodir Madani,Lila Boulekbache-Makhlouf 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.4

The effect of different storage methods (ambient temperature (A), refrigeration at 4 °C (R) and freezing at − 18 °C (F)), on the phytochemistry of an Algerian spice (paprika powder), was assessed. The optimized extract was obtained under the optimum conditions of ultrasound-assisted extraction (UAE) using response surface methodology (RSM) coupled with a Box–Behnken Design (BBD). This extract was evaluated for its total phenolics content (TPC), total flavonoids content (TFC) and its antioxidant and antibacterial activities. Under the optimum conditions (5 min for the irradiation time, 40% for the amplitude, 80% for ethanol concentration and 50% for solid–liquid ratio) the TPC was 12.23 ± 1.01 mg Gallic Acid Equivalent/gram of Dried Powder (mg GAE/g DP) which is very close with experimental assay. The TPC are better preserved at A whereas TFC and the antioxidant activity at F, and the antibacterial activity depend on the storage methods and the strains tested.