Structure and Dielectric Properties of Cerium Doped Lead Titanate Ceramics

Sintered ceramic powders of cerium-doped lead titanate (Pbx/2+1CexTi1-xO3) ceramics with different Ce dopant concentration in the range (x=0-0.1) have been prepared using a sol-gel chemical route. The sol-gel technique is known to offer better purity and homogeneity, and can yield stoichiometric powders with improved properties at relatively lower processing temperature in comparison to conventional solid-state reaction. X-ray diffraction (XRD) scanning electronic microscope (SEM) and Raman spectroscopy studies have been carried out to identify the crystallographic structure and phase formation. The refinement of the structural parameters was carried out by the Rietveld method. PCT exhibit tetragonal symmetry with the perovskite structure. The dielectric properties as a function of frequency, and phase transition studies on sintered ceramics Pbx/2+1CexTi1-xO3 (x=0.03) has been investigated in detail over a wide temperature range 30-500°C and the results are discussed. Keywords:  A. ceramics; B. x-ray diffraction; C. Raman spectroscopy; D. dielectric; C. properties; E. Ce-modified

Highly sensitive pseudo-differential ac-nanocalorimeter for the study of the glass transition

International audienceWe present a nanocalorimeter designed for the measurement of the dynamic heat capacity of thin films. The microfabricated sensor, the thermal conditioning of the sensor as well as the highly stable and low noise electronic chain allow measurements of the real and imaginary parts of the complex specific heat with a resolution ∆C/C of about 10 −5. The performances of this quasi-differential nanocalorimeter were tested on a model of polymeric glass-former, the PVAc. The high stability and low noise of the device are essential for accurate studies on non-equilibrium slow relaxing systems such as glasses

Design and Simulation of a Solar Energy System for Desalination of Brackish Water

In light of a sort of crisis of water scarcity which begins to loom worldwide as well as the economic constraints for achieving sustainable development, it becomes essential to find appropriate solutions to face this challenge. Morocco, which has considerable brackish water resources and an important solar resource deposit, is required to use desalination techniques; however, the reliability of such techniques can no longer be applied just in terms of their value as renewable sources of energy. The solution presented in this publication, establishes a rather reliable way to produce drinking water. The technique of desalination by reverse osmosis is considered in this study to be a promising technique. The objective of our study is the implementation of a prototype for desalination of reverse osmosis, which is a low-cost small unit used to treat brackish water based on solar energy

Remote Lab Experiments: Measuring and Monitoring of Temperature Changes

The physical training education systems of the faculties of science focus on practical manipulations. Remote Labs are a recent approach used for educating experimental manipulations by using the performance of information and communication technologies. This article presents a real remote laboratory using low-cost embedded systems addressed to engineering and undergraduate students. The manipulation is based on the electronic control system to change the temperature with a plate-form, which is developed to permit students and teacher access to this manipulation. Our purpose of this study is the development of a control system to improve current educational systems in Moroccan universities by managing practical manipulations for a large number of students, based on a web from anywhere and anytime. Measuring and Monitoring of Temperature changes is a new experience of a remote monitoring system that will be allowed the users to access the experiment thought a specific web site

Remote Lab Experiments: Measuring and Monitoring of Temperature Changes

The physical training education systems of the faculties of science focus on practical manipulations. Remote Labs are a recent approach used for educating experimental manipulations by using the performance of information and communication technologies. This article presents a real remote laboratory using low-cost embedded systems addressed to engineering and undergraduate students. The manipulation is based on the electronic control system to change the temperature with a plate-form, which is developed to permit students and teacher access to this manipulation. Our purpose of this study is the development of a control system to improve current educational systems in Moroccan universities by managing practical manipulations for a large number of students, based on a web from anywhere and anytime. Measuring and Monitoring of Temperature changes is a new experience of a remote monitoring system that will be allowed the users to access the experiment thought a specific web site.</p