Browsing by Author "Chaguetmi , Samiha"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Etude des propriétés photo-électrochimiques des nanofibres de dioxyde de titane décorées par des nanoparticules de l'oxyde de cuivre
    (Faculté des Sciences, 2023-07-03) SENANI , Khawla; Sobti , Nadjah; Chaguetmi , Samiha
    L'objectif principal de cette étude est la préparation des nano-fibres photo sensibilisées afin de les utiliser dans des applications photo-électrochimiques. Nous utilisons deux méthodes : (1) méthode hydrothermale pour préparer des nano-fibres de dioxyde de titane TiO2 supportée sur des plaques de titane métallique Ti, qui est basée sur le traitement thermique de titane Ti dans une solution aqueuse, suivi par (2) la méthode d'immersion qui consiste en la mise en contact du film de nano-fibre de TiO2 avec une solution contenant les nanoparticules de CuO. Nous avons utilisé quelques caractérisations physico-chimiques pour étudier les propriétés des films nano-fibriques de dioxyde de titane avant et après la décoration, tels que : la diffraction des rayons X (DRX), la spectroscopie Raman, spectroscopie UV-visible et la microscopie électronique à balayage (MEB).
  • Thumbnail Image
    Item
    PHYSICS 1: Mechanics of the Material Point Courses and exercises for students of : Matter Sciences (LMD SM) , Sciences and Technologies (LMD ST)
    (Faculty of Sciences, 2025) Chaguetmi , Samiha
    This course booklet for Physics I - Mechanics of Particle - is intended for students in the first year in the field of Matter Sciences. The main objective of this subject is to acquire the basic formalisms in the mechanics of a particle and the mathematical representations of physical phenomena related to particle mechanics. The program of the Mechanics of Material point in the first Semester consists of four chapters: - The first chapter provides a review of vector algebra and dimensional analysis. Both cover the fundamental quantities that are used to express physical laws and principles. In addition to necessary reviews, this section aims to introduce clear definitions and appropriate notations. - The second chapter is dedicated to Kinematics. The purpose is to describe the movements of objects without focusing on the causes that produce them. It deals exclusively with the motions of material points. - The third chapter describes the dynamics of a particle within the framework of Newtonian mechanics, including its three laws or principles: the law of inertia, the fundamental law of dynamics, and the law of reciprocal actions. We consider general laws, referred to as force laws, established for several interactions, along with applications aimed are predicting the motion of bodies. The concepts of angular momentum particle with respect to the origin and pseudo-forces are also addressed in this chapter. - The fourth chapter revolves around the third method of analysis, which is that of work and energy. This approach eliminates the need to calculate acceleration by directly relating force, mass, velocity, and displacement. We first consider the work done by a force and the kinetic energy of a particle. Subsequently, we delve into the concepts of potential and total energies, and we apply the principle of conservation of energy in various practical situations.