Phonocardiogram and Electrocardiogram Signals Processing using Wavelet Transform and Multilayer Perceptron Neural Network

International audienceThis article deals with an original approach of acquiring and processing electrocardiogram (ECG) and phonocardiogram (PCG) signals for the diagnosis of cardiac arrhythmias in order to remedy the difficulties encountered with the ECG. Indeed, it integrates an analysis tool based on wavelet transforms for the characterization of ECG signals and a classification system from multilayer perceptron neural network of five categories of cardiac arrhythmias: normal (N), left bundle branch block (LBBB), right bundle branch block (RBBB), premature atrial contraction (PAC) and premature ventricular contraction (PVC). The digitization of the signals is made from an Arduino Mega 2560 board. The realized system has been tested on 6 patients and the results are visualized on a smart phone turning under android operating system. These results are in agreement with medical previsions. Recognition rates are as follows: 100% for class N, 100% for class LBBB, 75% for class RBBB, 90.9% for class PVC and 100% for class PAC. We obtain a generalization rate of 92.9%

Function test of a 5 kW Generator using the Biodiesel obtained from the Neem oil as a biofuel

This video shows the function test of a 5 kW Generator using the Biodiesel obtained from the Neem oil as a biofuel.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

An accurate shock-capturing scheme based on rotated-hybrid Riemann solver AUFSRR scheme

International audiencePurpose - The purpose of this paper is to present a new hybrid Euler flux fonction for use in a finite-volume Euler/Navier-Stokes code and adapted to compressible flow problems. Design/methodology/approach - The proposed scheme, called AUFSRR can be devised by combining the AUFS solver and the Roe solver, based on a rotated Riemann solver approach (Sun and Takayama, 2003; Ren, 2003). The upwind direction is determined by the velocity-difference vector and idea is to apply the AUFS solver in the direction normal to shocks to suppress carbuncle and the Roe solver across shear layers to avoid an excessive amount of dissipation. The resulting flux functions can be implemented in a very simple manner, in the form of the Roe solver with modified wave speeds, so that converting an existing AUFS flux code into the new fluxes is an extremely simple task. Findings - The proposed flux functions require about 18 per cent more CPU time than the Roe flux. Accuracy, efficiency and other essential features of AUFSRR scheme are evaluated by analyzing shock propagation behaviours for both the steady and unsteady compressible flows. This is demonstrated by several test cases (1D and 2D) with standard finite-volume Euler code, by comparing results with existing methods. Practical implications - The hybrid Euler flux function is used in a finite-volume Euler/Navier-Stokes code and adapted to compressible flow problems. Originality/value - The AUFSRR scheme is devised by combining the AUFS solver and the Roe solver, based on a rotated Riemann solver approach

Mobile Three Gas Extractor Using Pressure Swing Adsorption Method

International audienceThis paper deals with a simple approach of producing three gases that are oxygen, nitrogen and pressurized air by using a mobile three gas extractor. Indeed, the proposed medical device integrates the following modules driven by an Arduino Mega 2560 board: Module of filtration and production of air made of filters, compressor and a cooling coil; module of oxygen and nitrogen production based on pressure swing adsorption (PSA) method and using the zeolite molecular sieves that restrain nitrogen and produce oxygen. The device is equipped of pressure sensors to control the output pressure of the gases. This implemented equipment has been tested and we obtained promising results. Indeed, a percentage of oxygen of 82 % has been reached. We have produced pressurized air with a pressure of 2.5 bars

Techno-economic investigation of an environmentally friendly small-scale solar tracker-based PV/wind/Battery hybrid system for off-grid rural electrification in the mount bamboutos, Cameroon

The present work demonstrates the techno-economic analysis of an environmentally friendly small-scale PV/Wind/Battery hybrid system for off-grid rural electrification in the city of Mbouda. The major contributions of this work are fourfold: (i) PV/Wind/Battery hybrid system is proposed for the very first time in this locality; (ii) six PV tracking techniques namely: horizontal axis (monthly adjustment), horizontal axis (weekly adjustment), horizontal axis (daily adjustment), horizontal axis (continuous adjustment), vertical axis (continuous adjustment) and dual-axis tracker are implemented in the present hybrid system; (iii) the impact of ambient air temperature on the PV power production is evaluated; (iv) the influence of three different hub heights (17 m, 50 m, 150 m) on the wind turbine power output is investigated. The electric load for the basic needs of a community of 152 consumers (households, hospitals, schools, businesses) such as; lighting, radio, television, phone charger, water heater, electric iron, and laptop, is estimated. HOMER Pro is used for the optimization and sensitivity analysis of the proposed hybrid system. The solutions obtained in the present work showed that compared to the PV power generated by fixed solar panels, the dual-axis solar tracker system was the system that offered the maximum power production (about 7.02%–30.73% more power). In addition, compared to the PV penetration of fixed solar panels, the dual solar tracker also offered the maximum PV penetration (about 7.64%–31.50% more PV penetration). It was also concluded that increasing the hub height (from 17 m to 150 m), significantly increased the wind power generation and penetration. Concerning the economic aspect of the work, it was noticed that the dual-axis solar tracking system presented the lowest levelized cost of energy (LCOE) and net present cost (NPC) when compared with the other aforementioned solar tracking systems. The results also indicated that taking into account the ambient air temperature, impacted the PV and wind power productions. The analysis of emissions allowed us to confirm that the system was environmentally friendly since no greenhouse gas was produced