Physico-chemical studies of MgNa

A magnesium-sodium triphosphate MgNa3P3O10·12H2O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA), differential scanning calorimetry (DSC) and infrared spectrometry which show the characteristic bands of a triphosphate P3O. The results of differential thermal analysis, X-Ray powder diffraction and IR spectra of the compound heated at different temperatures showed that, after dehydration, MgNa3P3O10·12H2O decomposes into an amorphous compound, then it crystallizes at 600 ° C in order to give the anhydrous triphosphate MgNa3P3O10. MgNa3P3O10 is stable until its melting point at 612 ° C. Two different methods Ozawa and KAS have been selected in studying the kinetics of thermal behavior of the triphosphate P3O10 for the first time. The kinetic and thermodynamic characteristics of the dehydration of MgNa3P3O10·12H2O and the thermal phenomena accompanying this dehydration were determinated and discussed on the basis of the proposed crystalline structure

Digital Evaluation of the Professional Skills of Educational Actors: Case of the E-portfolio

The current evolution of the technological field and the benefit of the introduction of new ICT in schools, suggest that the possibilities of using computer slides in the management of skills in training systems have become very strong or even obligatory. The transformation of the training system from the face-to-face to the remote and sometimes to the hybrid, has given way to new learning management structures, in this sense digital tools appear as relevant solutions to ensure the discontinuity caused by the internships, strikes and vacations. The portfolio is one of the technological tools, based on technical pedagogical engineering which includes well-defined stages but at the same time adapted according to the type of design chosen and the desired field of production, including a final objective of promoting skills. socio-professional practitioners. the e-portfolio is a digital file that brings together the various achievements and projects of a practitioner or a learner not only to judge their work but also to allow them to reflect on their own path during a training course and the challenges that there are to meet and take charge of their own development. However, misuse of the technical task of the trained and the educational task of the supervisors is complex. Our experimentation will take place in TAZA's center which currently provides training for teachers and administrators, which offers us an opportunity to experiment with the e-portfolio in two completely different training sectors in order to judge its reliability and feasibility. and its contribution to the professionalization of educational practices. It is true that this device will guarantee better training, will develop several skills at the same time and will open up fields of interaction and exchange, but its implementation remains difficult and even if its creation has advantages, this does not exclude the presence of many constraints and also limits

Dynamics of Hepatitis C Virus Infection: Mathematical Modeling and Parameter Estimation

In this paper, we provide a differential mathematical model with non-integer order derivative (fractional-order) to investigate the dynamics of Hepatitis-C Virus (HCV) replication, in presence of interferon-α (IFN) treatment. The fractional-order is considered to represent the intermediate cellular interactions and intracellular delay of the viral life cycle. We mathematically analyze and characterize the steady states and dynamical behavior of the model in presence of interferon-α treatment. We deduce a threshold parameter ℜ0 (average number of newly infected cells produced by a single infected cell) in terms of the treatment efficacy parameter 0 ≤ ε < 1 and other parameters. We also provide a numerical technique for solving the fractional-order model and fitting the model to real data during treatment. The numerical simulations confirm that the fractional-order differential models have the ability to provide accurate descriptions of nonlinear biological systems with memory. The analyses presented here give an insight to understand the dynamics of HCV infection

Qualitative properties and hopf bifurcation in haematopoietic disease model with chemotherapy

In this paper, we consider a model describing the dynamics of Hematopoietic Stem Cells (HSC) disease with chemotherapy. The model is given by a system of three ordinary differential equations with discrete delay. Its dynamics are studied in term of local stability of the possible steady states for the case without drug intervention term. We prove the existence of periodic oscillations for each case when the delay passes trough a critical values. In the end, we illustrate our results by some numerical simulations