Publications Scientifiques
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Item The effect of atmospheric optical phenomena photographed by students on learning motivation(2018) Blizak, Meriem Djanette; Remli, S.; Blizak, SalahThe atmospheric optical phenomena (mirages, rainbows, halos, blue sky, sunset …) that we can observe in everyday life are very interesting for stimulating the students’ curiosity. This study aimed to investigate the effect of atmospheric optical phenomena photographed by university students’ on their learning motivation in geometrical optics (GO). To achieve the aim of the study, an available sample of the study composed of (200) students from the biology department of Boumerdes University, Algeria, was used. The subjects were randomly distributed into two groups: (165) of them in the experimental group and (35) in the control group. We have asked every student in the experimental group to use their smartphone or tablet to taking photos of an atmospheric optical phenomena and giving a physical explain. According to the motivation post and pres test, there were statistical significant differences in learning motivation in the favor of the experimental groupItem The effect of using the history of sciences on conceptual understanding and intrinsic motivation(2017) Blizak, Meriem DjanetteThis study investigates the effect of using the history of science in teaching geometrical optics on the motivation and conceptual understanding of first year university students. For this purpose, 54 students were randomly selected, then divided into two groups: the experimental group was taught by using history of science before traditional geometrical optics teaching, and the control group was taught by traditional method only. Data were collected using two instruments: Geometrical Optics Understanding Concept Test and Geometrical Optics Intrinsic Motivation Scale. The finding showed that before instruction, the students have important and prevalent misconceptions about vision, propagation of light and refraction. After teaching of geometrical optics, the study shows that using the history of science shows greater effect on intrinsic motivation and concept understanding. The results have some implications for teaching physics, especially when the traditional teaching is inevitableItem What thinks the university's students about propagation of light in the vacuum?(2013) Blizak, Meriem Djanette; Chafiqi, Fouad; Kendil, DjamelThis study aims to study the conceptions of university students related to the notion of propagation of light in a vacuum. In order to fulfill our aim, a case study research method was used in the study, whose sample consisted of 321 Algerian undergraduates in different levels at science faculty (before and after the optics courses). The data were collected through a test comprising three questions. The results have indicated two students’ misconceptions concerning propagation of light in vacuum. The first one is that the light does not propagate in a vacuum. The second is that the light propagates according the horizontal direction (new misconception). The possible origins of these misconceptions are discussed and suggestions for how to prevent them are given. Also, our results suggest that university students who had a higher level of physics knowledge than their counterparts who studied only geometrical optics, they still held of the same misconceptions. Formal or traditional teaching seems helpless to facing these misconceptionsItem Students misconceptions about light in Algeria(2009) Blizak, Meriem Djanette; Chafiqi, Fouad; Kendil, DjamelPhysics education research has shown that students have difficulties in learning essential optics concepts. Therefore, in this present work we deal with student’s conceptions in geometrical optics field. Our objective is to show the Algerian students misconceptions. We proposed to 246 students in first year university (aged 18–21) a closed questionnaire where most of its questions were already used by other researchers. The misunderstandings identified were compared with those in literature. The results show that our students have the same misconceptions, related to the propagation of the light, the vision, the refraction and the reflexion, as the students in other countries (Andersson, Çiğdem ŞAHİN, Galili, Goldberg, Viennot,…). We investigate new students “misconception” concerning the propagation of the light in the vacuumItem NiO thin films for environmental photocatalytic applications : a review(2021) Blizak, Meriem Djanette; Remli, S.; Blizak, S.; Bouchenak, O.; Yahiaoui, K.Nickel oxide (NiO) thin film is metal oxide that has attracted much attention in recent years due to its environment friendliness. Like all metallic oxides semiconductors, thin films, NiOis gaining more and more attention as a promising photo-catalyst to replace powder catalysts, which are difficult in recycling. This paper summarized the photocatalytic activity of metallic oxides thin films. Furthermore, the results of several studies onthe efficient photo-catalyst of NiO thin films and its components have also been shown. This review will be useful to researcher’s investigate non-toxic materials, with low production cost and high efficiency in the field of environmental protectionItem Characterization and assessment of the antimicrobial function of total polyphenol extracts from pulps, leaves and seeds of two ceratonia siliqua L. varieties(2021) Yahiaoui, K.; Bouchenak, O.; Boumaza, S.; Toubal, S.; Blizak, Meriem Djanette; Nouani, A.; Arab, K.The overall phytochemical test results suggested that pulp, seeds, and leaves of both grafted and spontaneous varieties are especially rich in tannins , saponins, and leuco-anthocyanins. The result of the determination of total polyphenols Ceratonia siliqua L. showed that spontaneous leaves showed that the highest value of spontaneous leaves was 14 EAGmg / g, followed by grafted seeds (11.5 EAGmg / g), and spontaneous pulps (10.2 EAGmg / g). Infra -red spectroscopy revealed the presence of many functional groups in both varieties. The antimicrobial activity is particularly found with the spantaneous leaves against Escherichia coli (21.83 ± 0.93 mm) and Staphylococcus aureus (16.36 ± 0.63 mm) Microccus sp (15.83 ± 0.73 mm) and leaves grafted against Pseudomonas aeruginosa (14.30 ± 0.35 mm)Item Criblage phytochimique et évaluation du pouvoir antioxydant des feuilles de myrtus communis l. et rhamnus alaternus L.(Univérsité Saad Dahleb Blida 1, 2020) Bouchenak, Ouahiba; Yahiaoui, Karima; Benhabyles, Narimen; Laoufi, Razika; Toubal, Souheila; El Haddad, Djillali; Oussaid, Sounia; Blizak, Meriem Djanette; Arab, KarimDescription du sujet: les travaux d'investigation actuels sont axés sur la recherche de nouvelles molécules antioxydantes d'origine naturelle et proposition d'alternatives thérapeutiques.Objectifs: l'objectif de cette étude est de mettre en relation l'utilisation traditionnelle de Myrtus communis L. et Rhamnus alaternus L. par la population de Boumerdes et leur activité antioxydante.Méthodes: la mise en évidence du pouvoir antioxydant des deux plantes, consiste à un criblage phytochimique permettant d’avoir une idée sur la présence ou l'absence de certains métabolites primaires et secondaires. L'activité antioxydante est évaluée par la méthode de réduction du fer sur les trois extraits acétonique, méthanolique et éthanolique.Résultats: le screening phytochimique révèle une richesse des deux plantes en polyphénols, glucosides, saponosides, sucres réducteur et en flavonoïdes avec une absence des tanins catéchiques, d'anthocyanes, des caroténoïdes, des irridoides, des protéines, des stérols, des polyterpènes, d'amidon et des lipides. Le meilleur rendement est obtenu avec l'acétone à 48,5% pourMyrtus communis et Rhamnus alaternusà 47%. L'activité antioxydante est maximale pour Myrtus communisà la concentration de 1mg/ml à une densité optique pour les trois extraits : éthanolique (3,84), acétonique (3,46) et méthanolique (3,22) par rapport à l'acide ascorbique. Conclusion: ces résultats apportent un appui scientifique quant à l'utilisation traditionnelle de ces plantes, ouvrant ainsi des perspectives pour leur intégration dans les industries pharmaceutiques et alimentaires.