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154 results on '"Lachkar M"'

10. Teaching environmental themes within the “Scientific Awakening” course in Moroccan primary school:approaches, methods and difficulties

Author

El Batri, B. (Bouchta), Maskour, L. (Lhoussaine), Ksiksou, J. (Jamal), Jeronen, E. (Eila), Ismaili, J. (Jalal), Alami, A. (Anouar), Lachkar, M. (Mohammed), El Batri, B. (Bouchta), Maskour, L. (Lhoussaine), Ksiksou, J. (Jamal), Jeronen, E. (Eila), Ismaili, J. (Jalal), Alami, A. (Anouar), and Lachkar, M. (Mohammed)

Abstract

In addition to identifying the pedagogical approaches favoured by teachers in environmental education, the study aims to reveal the impact of the teaching methods and tools used as well as the teaching difficulties encountered on the effectiveness of teachers’ pedagogical action, particularly in the “Scientific Awakening” course. The study concerns a sample of 636 primary school teachers from the urban and rural areas of the Fez-Meknes Regional Academy of Education in Morocco. The data was collected using a 37-item questionnaire covering the following variables: the teaching methods adopted, the preferred pedagogical approaches, the teaching material used, and the teaching difficulties encountered. The study fits under a descriptive correlational design. The most used teaching methods were the teacher-centred oral methods (dialogue and demonstration method) lacking learner-centred activities (working in small groups, discovery method). The least used ones were laboratory experiments and ICT-based demonstrations. The study shows that teachers who use active methods are the most aware of difficulties in teaching environmental issues and were the most capable of effectively solving learning problems and achieving pedagogical objectives. The study shows that Moroccan primary school teachers need in-service training for the adoption of a systemic and interdisciplinary pedagogical approach. In addition, to address the issue of the alarming failure to complete the “Scientific Awakening” program, we recommend continuous training for the benefit of teachers. This training should cover the appropriate active methods to effectively complete this program. Finally, the study underlined the need to solve the problem of the enormous lack of teaching tools. Certainly, this shortage significantly influences the pedagogical action of teachers regardless of the pedagogical methods adopted.

Published
2022

14. Composition chimique et bioactivité de l’huile essentielle des feuilles de thuya de Berberie (Tetraclinis articulata Vahl) et de ses fractions chromatographiques.

Author

Bourkhiss, M., Lachkar, M., Ouakil, A., Farah, A., and Bouachrine, M.

Subjects
*ESSENTIAL oils, *LIMONENE, *PETROLEUM, *ANTI-infective agents, *HYDROCARBONS
Abstract

The essential oil of the leaves of Tetraclinis articulata Vahl Masters and fractions obtained by fractionation were analyzed by GC and GC/MS. The total essential oil of the leaves was found to contain bornyl acetate (30.6%), camphor (18.6%), α-pinene (16.8%), limonene (5.7%) and borneol (4.7%) as major compounds. The fractionation by flash chromatography of the oil gave four fractions (one hydrocarbon fraction and three oxygenated fractions). The FH fraction consists of monoterpene hydrocarbons, mainly α-pinene (28.2%) and limonene (12.6%). The FO1 fraction mainly includes bornyl acetate (47.2%) and camphor (26.5%), while the fractions FO2 and FO3 particularly concentrate on borneol (37.5; 32.2%) and camphor (20.8; 15.3%), respectively. The antimicrobial activity was tested with the oil of the leaves and chromatographic fractions. The essential oil crude and oxygenate fractions including FO2 and FO3 are the most active. The FO2 fraction in particular would be recommended to optimize the antimicrobial activity of the essential oil Tetraclinis articulata. [ABSTRACT FROM AUTHOR]

Published
2023
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18. Synthesis, crystal structure, physical and catalytic oxidation studies of a new hybrid phosphate [(N2H5)2Co(HPO4)2]

Author

Hamdi, N., Hidaoui, S., Hassani, H.O., Lachkar, M., Dusek, M., Morley, N., and El Bali, B.

Abstract

A new one-dimensional coordination polymer [(N2H5)2Co(HPO4)2] was synthesized by slow evaporation method and characterized by means of single-crystal X-ray diffraction, Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). Its catalytic activity was tested using UV–visible absorption measurements. The compound crystallizes in the monoclinic system (S.G: P21/c) with the cell parameters (Å, °): a = 5.3665(3), b = 11.1271(6), c = 7.7017(4), β = 104.843(4), V = 444.55(4) Å3 and Z = 2. The crystal structure, consisting of a linear chain, is made of rings of [CoN2O4] octahedra and [PO3(OH)] tetrahedra sharing vertices via oxygen atoms coordinated to cobalt centers. The rings are linked to chains running along [100] and form thereby polymeric chains that are connected by hydrogen bonds in a three-dimensional arrangement. The FTIR spectroscopy shows the expected bands of hydrazine and phosphate groups. The thermal behavior consists mainly of the loss of hydrazine moieties leading thus to the formation of anhydrous cobalt phosphate. The phosphate complex exhibits efficiency in catalytic oxidation and degradation of methylene blue dye. The ac magnetic susceptibility shows a peak indicating antiferromagnetic order with a Néel temperature of 5.5 K. Fitting the Curie-Weiss equation to the ac magnetic susceptibility above 50 K gives the average Curie-Weiss Constant to be −11.8 K.

Published
2020

28. Characterization of a new HV/HR CMOS Sensor in LF150nm Process for the ATLAS Inner Tracker Upgrade

Author

Degerli, Y., primary, Balli, F., additional, Barbero, M., additional, Bhat, S., additional, Breugnon, P., additional, Chen, Z., additional, Elhosni, M., additional, Godiot, S., additional, Guilloux, F., additional, Guyot, C., additional, Hemperek, T., additional, Hirono, T., additional, Iguaz, F. J., additional, Kruger, H., additional, Lachkar, M., additional, Liu, J., additional, Meyer, J. P., additional, Ouraou, A., additional, Pangaud, P., additional, Rymaszewski, P., additional, Rozanov, A., additional, Schwemling, P., additional, Vandenbroucke, M., additional, and Wermes, N., additional

Published
2017
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33. SYNTHESIS OF 2-PHENYL-4-METHYL-4-((TETRAZOL-5- YL)METHYL) OXAZOLINE

Author

Labriti, B., El Hallaoui, A., Elachqar, A., Alami, A., El Hajji, S., Boukallaba, K., El Bali, B., Lachkar, M., Allouchi, H., Martinez, J., and Rolland, V.

Subjects
oxazoline, tetrazole, cycloaddition
Abstract

La 2-phenyl-4-methyl-4(tetrazol-5-yl)methyl oxazoline 2 est préparée selon une réaction de cycloaddition mettant en jeu le nitrile 1 et l’azoture de soduim dans le toluéne en présence d’un sel d’amine., Journal Marocain de Chimie Hétérocyclique, Vol 5, No 1 (2006)

Published
2015
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35. New sterically unhindered benzoquinonemonoimines

Author

Touil, M., Lachkar, M., Siri, O., Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Cinam, Hal

Published
2011

37. Unprecedented N(H)-bridged tetraaza[1.1.1.1]m,p,m,p-cyclophanes

Author

Touil, M., Raimundo, J.M., Lachkar, M., Marsal, P., Siri, O., Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Cinam, Hal

Published
2010

39. New hybrid diphosphates Ln2(NH2(CH2)2NH2)(HP2O7)2•4H2O (Ln = Eu, Tb, Er): synthesis, single crystal and powder X-ray crystal structure

Author

Capitelli F. 1, El Bali B. 2, Essehli R., Lachkar M. 2, and da Silva I. 3

Subjects
powder diffraction structure analysis, diphosphate, lanthanide, single crystal structure analysis, ethylenediamine
Abstract

Crystals of lanthanide ethylenediamine diphos phates Ln2(NH2(CH2)2NH2)(HP2O7)2·4H2O (Ln = Eu (1), Tb (2), Er (2)) have been synthesized and investigated by single crystal X-ray diffractometry (Eu and Tb phases) and by powder X-ray diffractometry (Er phase). The three structures resulted to be isostructural within triclinic space group P-1, with unit cell parameters of a = 6.5050(6) Å; b = 6.9990(2) Å; c = 9.8450(9) Å; ± = 81.548(5)°; ² = 80.631(19)°; ³ = 88.369(9)°; V = 437.44(6) Å3 (1), a = 6.4360(7) Å; b = 6.9480(12) Å; c = 9.816(4) Å; ± = 81.987(19)°; ² = 80.595(16)°; ³ = 88.591(13)°; V = 428.82(19) Å3 (2), a = 6.39658(2) Å; b = 6.86682(2) Å; c = 9.78849(3) Å; ± = 81.6811(4)°; ² = 80.2304(3)°; ³ = 88.3812(3)°; V = 419.255(3) Å3 (3).The three-dimensional network is built up by the repetition of ab-parallel layers of LnO8 polyhedra corner-sharing with (HP2O7) groups; ethylenediamine molecules lie between such layers, acting both as receptors and donors in strong hydrogen bonds which assure the stabilizing of the entire framework.

Published
2006

40. New isostructural ethylenediammonium diphosphates (NH3(CH2)2NH3)2[Me(HP2O7)2•2H2O] [Me = Co, Ni]: X-ray crystal structure and vibrational spectroscopy

Author

Capitelli F. 1, El Bali B. 2, Essehli R. 2, Lachkar M. 2, Valentini V. 3, Mattei G. 3, Taraba J. 4, and Zak Z. 4

Abstract

New ethylenediammonium diphosphates (NH3(CH2)2NH3)2[Me(HP2O7)2·2H2O] [Me = Co (1), Ni (2)] have been synthesized and investigated by single-crystal X-ray diffractometry. The two structures resulted to be isostructural within triclinic space group P-1. The unit-cell parameters are: a = 7.5211(6) Å, b = 7.5574(3) Å, c = 9.7689(7) Å, ± = 103.6(1)°, ² = 111.14(1)°, ³ = 98.04(1)°, V = 486.9(1) Å3 (1) and a = 7.4631(15) Å, b = 7.5274(12) Å, c = 9.743(3) Å, ± = 104.28(2)°, ² = 110.75(2)°, ³ = 97.50(2)°, V = 481.4(2) Å3 (2). The three-dimensional network is built up by discrete Me(HP2O7)2 · 2 H2O moieties, which, via strong O—H … O bonds, form layers parallel to ab plane. Ethylenediammonium groups are located between such layers, stabilizing the framework via N—H … O bonds. The hydrogendiphosphate group presents bent eclipsed conformation, while the Me ion lies on inversion centre. The structural data, as the bent POP configuration, have been confirmed by the Raman and infrared spectra of the title compounds. In particular, the non-coincidence between the infrared and Raman bands supports the centrosymmetric structure of the investigated crystals.

Published
2006

48. Synthesis of α-Heterocyclic α-Aminophosphonates, Part II: Morpholine, Piperidine, Pyrrolidine, Tetrahydrofurylmethylamine, N-Benzyl-N-Methylamine, and Aniline Derivatives

Author

Boukallaba, K., primary, Elachqar, A., additional, El Hallaoui, A., additional, Alami, A., additional, El Hajji, S., additional, Labriti, B., additional, Atmani, A., additional, El Bali, B., additional, Lachkar, M., additional, Allouchi, H., additional, Martinez, J., additional, and Rolland, V., additional

Published
2007
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