51 research outputs found

    4-Amino-3,5-di-2-pyridyl-4H-1,2,4-triazole

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    In the crystal structure of the title compound, C12H10N6, the mol­ecules deviate slightly from planarity. The plane of the central triazole ring makes angles of 6.13 (9) and 3.28 (10)° with the pyridyl ring planes. Intra­molecular N—H⋯N inter­actions form six-membered closed rings. The crystal packing also shows weak C—Hâ‹ŻÏ€ and C—H⋯N inter­actions

    4-Amino-1H-1,2,4-triazol-1-ium nitrate

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    The non-centrosymmetric crystal structure of the novel semi-organic title compound, C2H5N4 +·NO3 −, is based on alternating layers of 4-amino-1H-1,2,4-triazolinium cations (formed by parallel chains of cations mediated by weak C—H⋯N hydrogen bonds) and nitrate anions inter­connected via linear and bifurcated N—H⋯O hydrogen bonds and weak C—H⋯O hydrogen bonds. N—H⋯N hydrogen bonds link the anions and cations

    Inhibitive action of gramine towards corrosion of mild steel in deaerated 1.0 M hydrochloric acid solutions

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    The effect of addition of gramine on mild steel dissolution in deaerated 1.0 M hydrochloric acid was studied through potentiodynamic polarisation curves, electrochemical impedance spectroscopy and gravimetric measurements in the temperature range from 25 °C to 55 °C. Gramine was found to shift the corrosion potentials towards less noble values and decrease both dissolution of mild steel and hydrogen evolution reaction. Gramine did not affect the corrosion reaction mechanism (blocking effect). Results obtained from the several measurement techniques were in good agreement and revealed good inhibition efficiencies in the concentration range (0.75 mM ÷ 7.5 mM) particularly at higher concentrations

    Les représentations des enseignants de français sur un cours de langue : le cas d'enseignants universitaires marocains

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    This analysis focuses on the representations that teachers of French as Foreign Language do have about their teaching practices for and with students enrolled in the public universities of Morocco. During the first year of their Bachelor’s degree, these students must enroll in a French course whose aim is to facilitate the linguistic integration of Arabic-speaking high school graduates willing to major in academic disciplines taught in French.The analysis of these representations was carried out through questionnaire-based surveys, class observations and the direct interviews of 19 teacher-informants. The analysis foregrounds the way these teachers perceive and seize the five language skills in a class context. Most importantly, the analysis highlights major discrepancies between what these teachers believe and declare and their effective actual teaching practices. This gap is however not ascribed to them, but is revealing of the challenges they encounter. The present analysis concludes on a series of recommendations to overcome and remedy these challenges.La prĂ©sente Ă©tude porte sur les reprĂ©sentations qu’ont des enseignants de français langue Ă©trangĂšre par rapport Ă  leurs pratiques d’enseignement pour un public d’étudiants Ă  l’universitĂ© publique au Maroc. Ces Ă©tudiants suivent les cours d’un module transversal de langue française, partie intĂ©grante de la premiĂšre annĂ©e de licence, qui a pour objectif de faciliter l’intĂ©gration linguistique des bacheliers arabophones poursuivant leurs Ă©tudes dans des disciplines universitaires dont la langue d’enseignement est le français. L’analyse des reprĂ©sentations via une mĂ©thodologie d’enquĂȘte rĂ©alisĂ©e en face-Ă -face auprĂšs de 19 enseignants-informateurs avec questionnaires, observation de classes et entretien, nous permet d’approcher leur maniĂšre de concevoir et d’aborder en cours les cinq compĂ©tences langagiĂšres. À l’issue de l’analyse des donnĂ©es, il ressort un dĂ©calage important sur de nombreux aspects entre les pratiques dĂ©clarĂ©es et les pratiques effectives. Ce dĂ©calage n’est pas propre Ă  ces enseignants, il nous informe sur les difficultĂ©s rencontrĂ©es. L’analyse des donnĂ©es recueillies dĂ©bouche sur une sĂ©rie de propositions pour y remĂ©dier

    Les représentations des enseignants de français sur un cours de langue : le cas d'enseignants universitaires marocains

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    This analysis focuses on the representations that teachers of French as Foreign Language do have about their teaching practices for and with students enrolled in the public universities of Morocco. During the first year of their Bachelor’s degree, these students must enroll in a French course whose aim is to facilitate the linguistic integration of Arabic-speaking high school graduates willing to major in academic disciplines taught in French.The analysis of these representations was carried out through questionnaire-based surveys, class observations and the direct interviews of 19 teacher-informants. The analysis foregrounds the way these teachers perceive and seize the five language skills in a class context. Most importantly, the analysis highlights major discrepancies between what these teachers believe and declare and their effective actual teaching practices. This gap is however not ascribed to them, but is revealing of the challenges they encounter. The present analysis concludes on a series of recommendations to overcome and remedy these challenges.La prĂ©sente Ă©tude porte sur les reprĂ©sentations qu’ont des enseignants de français langue Ă©trangĂšre par rapport Ă  leurs pratiques d’enseignement pour un public d’étudiants Ă  l’universitĂ© publique au Maroc. Ces Ă©tudiants suivent les cours d’un module transversal de langue française, partie intĂ©grante de la premiĂšre annĂ©e de licence, qui a pour objectif de faciliter l’intĂ©gration linguistique des bacheliers arabophones poursuivant leurs Ă©tudes dans des disciplines universitaires dont la langue d’enseignement est le français. L’analyse des reprĂ©sentations via une mĂ©thodologie d’enquĂȘte rĂ©alisĂ©e en face-Ă -face auprĂšs de 19 enseignants-informateurs avec questionnaires, observation de classes et entretien, nous permet d’approcher leur maniĂšre de concevoir et d’aborder en cours les cinq compĂ©tences langagiĂšres. À l’issue de l’analyse des donnĂ©es, il ressort un dĂ©calage important sur de nombreux aspects entre les pratiques dĂ©clarĂ©es et les pratiques effectives. Ce dĂ©calage n’est pas propre Ă  ces enseignants, il nous informe sur les difficultĂ©s rencontrĂ©es. L’analyse des donnĂ©es recueillies dĂ©bouche sur une sĂ©rie de propositions pour y remĂ©dier

    Complexes binucleaires de derives de la pyridazyne ou du pyrazole : syntheses, structures cristallines et interactions magnetiques

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    SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

    The représentations of the teachers of french on a language course : the case of Moroccan university teachers

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    La prĂ©sente Ă©tude porte sur les reprĂ©sentations qu’ont des enseignants de français langue Ă©trangĂšre par rapport Ă  leurs pratiques d’enseignement pour un public d’étudiants Ă  l’universitĂ© publique au Maroc. Ces Ă©tudiants suivent les cours d’un module transversal de langue française, partie intĂ©grante de la premiĂšre annĂ©e de licence, qui a pour objectif de faciliter l’intĂ©gration linguistique des bacheliers arabophones poursuivant leurs Ă©tudes dans des disciplines universitaires dont la langue d’enseignement est le français. L’analyse des reprĂ©sentations via une mĂ©thodologie d’enquĂȘte rĂ©alisĂ©e en face-Ă -face auprĂšs de 19 enseignants-informateurs avec questionnaires, observation de classes et entretien, nous permet d’approcher leur maniĂšre de concevoir et d’aborder en cours les cinq compĂ©tences langagiĂšres. À l’issue de l’analyse des donnĂ©es, il ressort un dĂ©calage important sur de nombreux aspects entre les pratiques dĂ©clarĂ©es et les pratiques effectives. Ce dĂ©calage n’est pas propre Ă  ces enseignants, il nous informe sur les difficultĂ©s rencontrĂ©es. L’analyse des donnĂ©es recueillies dĂ©bouche sur une sĂ©rie de propositions pour y remĂ©dier.This analysis focuses on the representations that teachers of French as Foreign Language do have about their teaching practices for and with students enrolled in the public universities of Morocco. During the first year of their Bachelor’s degree, these students must enroll in a French course whose aim is to facilitate the linguistic integration of Arabic-speaking high school graduates willing to major in academic disciplines taught in French.The analysis of these representations was carried out through questionnaire-based surveys, class observations and the direct interviews of 19 teacher-informants. The analysis foregrounds the way these teachers perceive and seize the five language skills in a class context. Most importantly, the analysis highlights major discrepancies between what these teachers believe and declare and their effective actual teaching practices. This gap is however not ascribed to them, but is revealing of the challenges they encounter. The present analysis concludes on a series of recommendations to overcome and remedy these challenges

    On the relationship between corrosion inhibiting effect and molecular structure of 2,5-bis(<i>n</i>-pyridyl)-1,3,4-thiadiazole derivatives in acidic media: ac impedance and DFT studies

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    The inhibition properties of 2,5-bis(n-pyridyl)-1,3,4-thiadiazoles (n-PTH) on corrosion of mild steel in different acidic media (1 M HCl, 0.5 M H2SO4 and 1 M HClO4) were analyzed by electrochemical impedance spectroscopy (EIS). The n-PTH derivatives exhibit good inhibition properties in different acidic solutions and the calculated values of ΔG°ads revealed that the adsorption mechanism of n-PTH on steel surface is mainly due to chemisorption. While in 1 M HClO4, both 2-PTH and 4-PTH isomers stimulate the corrosion process especially at low concentrations. Quantum chemical calculations using the density functional theory (DFT) were performed on n-PTH derivatives to determine the relationship between molecular structure and their inhibition efficiencies. The results of the quantum chemical calculations and experimental inhibition efficiency were subjected to correlation analysis and indicate that the inhibition effects of n-PTH may be explained in terms of electronic properties
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