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In the photovoltaic (PV) panels modeling field, this paper presents a comparative study of two parameter estimation methods: the iterative method called Gauss Seidel, applied on the single diode model, and the analytical method used on the double diode model. These parameter estimation methods are based on the manufacturer's datasheets. They are also tested on three PV modules of different technologies:...
We study interbubble gas transfer in liquid foams by measuring the relative decrease of the bubble area from reflectometry. Foams are obtained by independently fixing foaming solution and gas flows through a coarse porous structure. Precise measurements of these flows instantaneously give the gas volume fractions of the foams; real time diffractometry gives their initial bubble size distributions,...
Liquid foams are obtained by independently fixing foaming solution and gas flows through a coarse porous structure. Precise measurements of these flows immediately give the gas-volume fractions of the foams; real-time diffractometry gives their initial bubble-size distributions and these are found to be lognormal. — The proposed methods provide reproducible foams and are sensitive. They will be useful...
The modeling of a solar cell is useful for any operation of efficiency optimization or of diagnostic of the photovoltaic generator. Usually, a solar cell is represented by an equivalent electrical circuit which the physical parameters can be determined experimentally from the (current-voltage) characteristic. For the classical two exponential model, the equivalent circuit contains two diodes, a photogenerated...
We present in this work a numerical model based on the finite element method to detect squat defect which are dangerously frequent in the rail network. We have used the pulsed infrared technique thermography for modeling the detection of these defects. We also developed a model for predicting the depth of these defects, which is a crucial parameter in the characterization of the railway state. The...
The infrared thermography technique developed in the present study was successfully applied to determine the scale thicknesses of the steel pipe. We aim to estimate the thickness of the scale on the inner surfaces by calculation of the maximum temperature of the infected pipe heated surface. Dimensions of the pipe and those of the layer of scale are taken as geometrical parameter. We have studied...
Today, the current need consisting of implementing more and more complex systems imply the implementation of new methodologies to make the CAD product reliable in order to improve time to market, study costs, reusability and reliability of the design process. This paper proposes a high level design approach applied for the simulation and the optimization of fractional-N synthesizer acting as a direct...
Today, design requirements are extending more and more from electronic (analogue and digital) to multidiscipline ones. These current needs imply implementation of methodologies to make the CAD product reliable in order to improve time to market, study costs, reusability and reliability of the design process. This paper proposes a high level design approach applied for the characterization and the...
The purpose of this work is to optimize the design of an MSK modulator able to operate at a high data modulation. The optimization approach applies an experimental design methodology having in view to minimize the modulator response time. This methodology is traditionally applied by agronomists and chemists. We show how it can be perfectly suited to optimize electronic designs.
The purpose of this work is to design a MSK modulator capable to work at a high data modulation. To achieve a low simulation runtime, the modulator is described in VHDL-AMS hardware description language. It is optimized by applying the “Hoke_D4 experimental design” with five factors having in view to minimize the modulator response time. An optimum solution is performed with the help of NEMROD software.
In this work, we expose our approach to design and optimize mixed analog and digital systems at a high level description using VHDL-AMS. The studied system consists of a MSK modulator designed and optimized for a DECT standard application. The applied optimization method uses the ldquoexperience plansrdquo with five generics having in view to minimize the modulator response time. At this level, we...
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