Mediterranean Journal of Modeling and Simulation

9

Authors: Mohamed HOUAS, Mihoub BOUDERBALA, Abdelkader BENALI

This paper studies the existence of solutions for Caputo fractional hybrid q-di¤erential equations. The existence obtained by using the Leray-Schauder's alternative, while the uniqueness of solutions is established by means of Banach's contraction mapping principle. An illustrative examples are also included.

11

Authors: Mohamed Bendali, Boualem Bouyahiaoui, Adel Belmecheri, Salah-Eddine Bentridi, Abdeslam Abtouta

This paper presents all stages of the gravimetric network of the upper Chelif basin, including its development and data processing. This network consists of twenty six gravimetric stations. The descriptions of the design ; the gravity survey of the network and the gravimetric stations coordinates are given. These gravimetric stations are connected to the Algerian zero order gravimetric network by means of relative gravimetric values. The measurements were performed using a terrestrial LaCoste Romberg D220 gravimeter, with an instrumental accuracy of 1¸tglas. The accuracy of the determination of gravity values at individual stations is about 13 ¸tgals. In order to ensure the uniformity of obtained results and thus avoid having several gravity values at the same station, the network has been compensated. This compensation was performed by the ginning method.

16

Authors: B. Abderezzak, M. Hinaje, J. Leveque

This work is an experimental approach regarding the opportunity to exploit Proton Exchange Membrane Fuel Cell (PEMFC) waste heat, using Thermoelectric Generator (TEG) Modules. The amount of energy recovered by TEG modules can be stored using NiMH batteries, and used for feeding the PEMFC Stack screens and LED lights once its turns on "Stand-by" mode. In fact, several combinations are envisaged to depict the optimal working conditions of the proposed system. The proposed 6A and 15A TEG modules are experienced under a 20A and 30A of load applied on the PEMFC Stack. A Re-Start mode is then investigated to observe the system response against such scenarios. The experimental result shows a promising output voltage rates generated by the TEG modules. At stack working temperature of 60µrC, the 15A TEG voltage is 500 mV and 571 mV under stack load of 20A and 30A respectively. In Re-Start mode, at same stack temperature, the output voltage is 517 mV. A numerical approach is employed for the determination of experimental Seebeck coe¢ cient and the evaluation of the thermoelectric conversion efficiency, using a one-dimensional (1-D) steady state model. A polynomial function of the experimental Seebeck coe¢ cient is then deduced.