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

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%

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

Numerical computation of heat transfer, moisture transport and thermal comfort through walls of buildings made of concrete material in the city of Douala, Cameroon: An ab initio investigation

The buildings of the city of Douala in Cameroon have been experiencing degradation for several decades due to the climate characterized by high humidity and oppressive heat. As a result, large grayish or black stains can be observed on these buildings. We sometimes witness the subsidence of the slab of the balconies, the cracking of the walls and the collapse of the buildings worn by the humidity. These damages are generally caused by infiltration and capillary rise. In addition, it has been demonstrated that people living in damp buildings are at risk of illnesses such as asthma and lung infections. Therefore, the novelty of this work is threefold: (i) it proposes for the very first time a numerical study of the transport of humidity and heat through the porous walls of buildings constructed with concrete material, the main construction material in the city of Douala; (ii) It was determined what level of indoor thermal comfort was appropriate for sleeping inside a real three-dimensional G+1 complex residential building constructed with concrete blocks; and (iii) Using the geographical coordinates, and time data, the sun radiation's direction of incidence was assessed throughout the simulation. The computation was performed using Comsol Multiphysics 6.0 software. The distributions of temperature, relative humidity as well as moisture level were presented at various periods. It appears from the results that face to this high humidity, the concrete material retains a large quantity of water for a considerable periods of time, which weakens the steel reinforcement of concrete which is corroded by rust. The computation of thermal comfort in the 3D building showed that the various rooms of the building were not comfortable during the night since temperature inside the building increased progressively due to diffusion of heat. In addition, the numerical solutions indicated that the energy stored within the walls diffused from the external walls to the internal walls during the night. It was also demonstrated that the walls of the building were warmer than the windows, doors and the roof at the computational times, which simply revealed a greater storage capacity of heat in the concrete blocks material. The findings highlighted that the temperature decreased rapidly in a thickness of 0.06 m of the concrete block during the nine days and this decrease was attenuated in the second part of the thickness of the concrete block (0.14 m)