Effect of a Thermal Nonlinear Absorption Coefficient on the Dynamics of a Photovoltaic Panel

In this article, we propose a theoretical study of the effect of a thermal nonlinear absorption coefficient on the dynamics of a photovoltaic (PV) panel. This coefficient is expressed as a quadratic function of temperature of a PV module known as active zone of a PV panel. Based on the energy balance at each layer of a PV panel, the mathematical expressions of the temperature on each layer are derived. A comparative study of the thermal behavior of a PV panel for a constant and nonlinear coefficient is made, thanks to the numerical investigations carried out in the MATLAB environment. We reveal that, this nonlinear absorption coefficient induces the cooling of a PV panel as a whole, and optimize the electrical efficiency of a PV panel around 2.5%. Keywords: Nonlinear absorption coefficient, recombination process, electrical efficiency, diffusion process, PV panel. DOI: 10.7176/JETP/10-6-02 Publication date:October 31st 202

Integer solutions of integral inequalities and H-invariant Jacobian Poisson structures

We study the Jacobian Poisson structures in any dimension invariant with respect to the discrete Heisenberg group. The classification problem is related to the discrete volume of suitable solids. Particular attention is given to dimension 3 whose simplest example is the Artin-Schelter-Tate Poisson tensors

Poisson (co)homology of polynomial Poisson algebras in dimension four: Sklyanin's case

In this paper, we compute the Poisson (co)homology of a polynomial Poisson structure given by two Casimir polynomial functions which define a complete intersection with an isolated singularity

On the Heisenberg invariance and the Elliptic Poisson tensors

We study different algebraic and geometric properties of Heisenberg invariant Poisson polynomial quadratic algebras. We show that these algebras are unimodular. The elliptic Sklyanin-Odesskii-Feigin Poisson algebras $q_{n,k}(\mathcal E)$ are the main important example. We classify all quadratic $H-$invariant Poisson tensors on ${\mathbb C}^n$ with $n\leq 6$ and show that for $n\leq 5$ they coincide with the elliptic Sklyanin-Odesskii-Feigin Poisson algebras or with their certain degenerations.Comment: 14 pages, no figures, minor revision, typos correcte

Effects of a Non-Sinusoidal Wind on Plants

In this paper, we elaborate a nonlinear theory of plants suggested to both fifth nonlinearities and non-sinusoidal wind effects modeled by the sinus cardinal function known as a good model used to approximate the Dirac function (behavior). By using the plan beam theory and the multiple time scales method, we find that the interactions between plants and wind are governed by the coupled differential system of equations. Through analytical and numerical techniques, we observe in the non-resonance state, that the effects of wind on the plant are worthless while its harmonic oscillations with their corresponding stability boundaries are tackled in the resonance case. Owing to the rang of the control parameters, we also examine periodic, quasi-periodic and chaotic behavior of the system. Our investigations show that judicious choice of some system’s parameters can avoid the plant rupture during violent storms. For applications, numerical simulations carry out with the physical parameters of Pinus Pinaster Ait., corn plant and those of Raphia Vinifera lead to very interesting results showing the wideness applicability of the results established within this paper

Effects of a Thermal Nonlinear Resistance on the Power Output of the PV Cell

Within the existing approaches aiming to ameliorate the performances of the photovoltaic (PV) cell, we note that the nonlinear behaviour of the PV cell components is not exploited. In this paper, we examine the effects of a thermal nonlinear resistance on the characteristics of a PV cell known as the current-voltage I-V and power-voltage P-V. This thermal nonlinear resistance is constituted of a series resistance whose value varies as a quadratic function of the temperature across it. In the standard test condition and around this proposed model of the PV, analytical study and numerical simulations in MATLAB as well as experimental investigations with Multisim environment are made...........

Contribution of a non-uniform magnetic field on the electric power of a photovoltaic panel

Following existing studies on the effects of the uniform magnetic field conducted on a PV module, we note that the effect of a non-uniform magnetic field has not yet been conducted on a PV panel due to its large dimensions. In this paper, the behavior of a PV panel submitted to a non-uniform magnetic field is examined. The simplified synoptic of our PV panel is consisting of two large identical PV modules connected in series. By solving the continuity equation, we determine the distribution of minority carriers in this PV panel. Therefore, the output electrical characteristics (photocurrent, photovoltage and electric power) of this PV panel suggested to the effects of a non-uniform magnetic field are evaluated. In the standard test conditions, numerical simulations are carried out on the evolution of these electrical parameters. Our results show that a non-uniform magnetic field creates a non-uniform distribution of the electrical quantities in a PV panel. Moreover, we establish that, under the effects of a non-uniform magnetic field, the PV panel behaves as a PV panel suggested to the effect of partial shading. A comparative study between the impacts of a non-uniform and a uniform magnetic field on the PV panel is also carried out. It appears that a non-uniform magnetic field reduces the electric power of a PV panel more than a uniform magnetic field. Keywords: Photocurrent; photovoltage; electric power; non-uniform magnetic field; PV panel; Shading. DOI: 10.7176/JETP/10-7-03 Publication date: November 30th 2020

Modèles Sémantiques dans l'intégration des systèmes d'information pour l'éducation sur le Web

International audienceLes systèmes informatiques d'éducation en ligne (e-Education) représentent une catégorie importante des systèmes d'information bénéficiant des standards du Web pour leurs implémentation, déploiement et intégration. Notre travail propose une approche basée sur les technologies du Web Sémantique pour implémenter les fonctionnalités et l'interopérabilité pour le système d'e-Education en production, de l'entreprise Educlever. Nous proposons une implémentation des fonctionnalités de ce système e-Education basée sur des ontologies décrivant les connaissances gérées par ce système.Nous montrons également comment cette représentation des connaissances en plus d'aider à l'implémentation des fonctionnalités permet l'intégration des ressources externes à Educlever, assure le respect des standards de l'éducation en ligne et de l'éducation nationale, et enfin assure l'interopérabilité avec d'autres systèmes