Comparative study of the implementation of tin and titanium oxide nanoparticles as electrodes materials in Li-ion batteries

Transition metal oxides potentially present higher specific capacities than the current anodes based on carbon, providing an increasing energy density as compared to commercial Li-ion batteries. However, many parameters could influence the performance of the batteries, which depend on the processing of the electrode materials leading to different surface properties, sizes or crystalline phases. In this work a comparative study of tin and titanium oxide nanoparticles synthesized by different methods, undoped or Li doped, used as single components or in mixed ratio, or alternatively forming a composite with graphene oxide have been tested demonstrating an enhancement in capacity with Li doping and better cyclability for mixed phases and composite anodes

GEOSPATIAL TOOLS FOR PREVENTION OF URBAN FLOODS CASE STUDY: RIVER OF EL MALEH (CITY OF MOHAMMEDIA – MOROCCO)

Today, the prevention and the risk management occupy an important part of public policy activities and are considered as major components in the process of sustainable development of territories. Due to the expansion of IT processes, in particular the geomatics sciences, decision-makers are increasingly requesting for digital tools before, during and after the risks of natural disasters. Both, the geographic information system (GIS) and the remote sensing are considered as geospatial and fundamental tools which help to understand the evolution of risks, to analyze their temporality and to make the right decisions. The historic events (on 1996, 2002 and 2010) which struck the city of Mohammedia and having caused the consequent damage to vital infrastructure and private property, require a thorough and rational analyze to benefit from it and well manage the floods phenomena. This article present i) the contribution of the geospatial tools for the floods simulation of Oued of el Maleh city at various return periods. These tools allow the demarcation of flood-risk areas and so to make floods simulations in several scenarios (decadal flood, 20-year flood, 50-year flood, 100-year flood, 500-year flood & also millennial flood) and besides (ii) present a synthesis map combining the territorial stakes superposed on the flood scenarios at different periods of return

Investigation of the Liquid Plug Friction Force in the Self-Oscillating Fluidic Heat Engine (SOFHE)

International audienceWe investigate the friction force of the oscillating liquid plug in a self-oscillating fluidic heat engine (SOFHE) in the laminar regime using numerical simulations, compared to analytical relations and experimental measurements. We study the effect of varying the length to diameter ratio (LID) and compare the results to the analytical solutions for an infinite length liquid plug, in order to clarify the impact of velocity field near the menisci (end effects). The results showed that the analytical solution for an infinite liquid plug can be used for L/D>10 with acceptable accuracy, despite the velocity not being fully developed. Modifications are required to account for end effects for L/D<; 10