Hirshfeld surface analysis and quantum chemical study of molecular structure of phosphate

ABSTRACT. In this present study, Density fuctional theoretical computations are performed at (B3LYP, PBEPBE), HF and MP2 level with 3-21G basis sets to derive optimized geometry and bonding features. The calculated geometrical parameters have been compared with experimental data. The intermolecular O–H…O and N–H…O hydrogen bonds are involved in crystal structure stabilization. An intramolecular O–H…N hydrogen bond is observed between the phosphate OH group and the N atom. Further, the molecular Hirshfeld surface analysis was carried out to reveal the nature of intermolecular contacts and the fingerprint plot provides the information about the percentage contribution and reveals that the O…H (44.1%) interactions have the major contribution to form the crystal. The Mulliken population analysis and the HOMO-LUMO energy gaps show that the molecule has a good stability and from the calculation, we conclude that the molecule is really hard materials.                     KEY WORDS: Energy gaps, Hydrogen bonds, Hirshfeld surface, Mulliken population, Phosphate   Bull. Chem. Soc. Ethiop. 2021, 35(3), 625-638. DOI: https://dx.doi.org/10.4314/bcse.v35i3.1

Advanced model of squirrel cage induction machine for broken rotor bars fault using multi indicators

Squirrel cage induction machine are the most commonly used electrical drives, but like any other machine, they are vulnerable to faults. Among the widespread failures of the induction machine there are rotor faults. This paper focuses on the detection of broken rotor bars fault using multi-indicator. However, diagnostics of asynchronous machine rotor faults can be accomplished by analysing the anomalies of machine local variable such as torque, magnetic flux, stator current and neutral voltage signature analysis. The aim of this research is to summarize the existing models and to develop new models of squirrel cage induction motors with consideration of the neutral voltage and to study the effect of broken rotor bars on the different electrical quantities such as the park currents, torque, stator currents and neutral voltage. The performance of the model was assessed by comparing the simulation and experimental results. The obtained results show the effectiveness of the model, and allow detection and diagnosis of these defects

THE CORPORATE GOVERNANCE PRACTICES WITHIN THE PUBLIC ENTERPRISES IN MOROCCO: CONTEXT AND EVOLUTIONS

While a large Moroccan private companies have recognized earlier the importance of the implementation of the best corporate governance practices, the sector of Public Enterprises (EEP) in Morocco, took into consideration all the impact of the implementation of these governance practices and in terms of improved performance and in terms of quality of relationships with all the Stakeholders that for ten years, and so largest since the reform of the financial control of the state over the EEP as of 2004. To measure the dimension taken by corporate governance in this sector, we propose, in the context of this work to analyze the inventory of good practices of corporate governance within the EEP by the state Moroccan portfolio. This work is an essential component of our thesis that the main research question focuses on the place of corporate governance practices in the public enterprises sector, and the strategies to be adopted to raise these practices to international standards

ŒIL SUR LA SAGESSE SOUS DIFFÉRENTS ANGLES

Cet article est une illustration d'un point de vue conceptuel qui définit le bonheur de manière à le goûter et à l'utiliser dans l'environnement institutionnel -écoles administrations et autres-. Sans oublier que ce fameux dialogue était entre trois personnages célèbres qui analysent et interprètent chacun le bonheur selon son cadre de référence et sa carte du monde. Nous allons le définir long et large à travers cet article

LECTURE DU COACHING MENTAL : INSPIRATION DU MENTAL DES CHAMPIONS

Le coaching mental est un processus interactif conçu pour aider les organisations ou les personnes elles-mêmes à se développer plus rapidement et obtenir de meilleurs résultats dans le domaine de leur choix. Le coaching sportif qui nous intéresse ici ou le coach est tout à la fois un guide, un éducateur et une présence affective. Le coach aide d’une manière générale les gens à se mettre en état de performance. Pour ce faire, le sportif et lui élabore un bilan de la situation actuelle, fixent des objectifs, des challenge depuis mettent en place les étapes du changement comportemental. Cette lecture va nous rapprocher plus de ce phénomène qui est à la fois celui des sports de haut niveau et aussi organisationnel