The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Alessandra Di Gangi - One of the best experts on this subject based on the ideXlab platform.
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a procedure to calculate the i v characteristics of thin film photovoltaic modules using an explicit Rational Form
Applied Energy, 2015Co-Authors: R Miceli, Aldo Orioli, Alessandra Di GangiAbstract:Abstract Accurate models of the electrical behaviour of photovoltaic modules are effective tools for system design. One or two diode equivalent circuits have been widely used even though some mathematical difficulties were found dealing with implicit equations. In this paper, a new model based on a simple Rational function, which does not contain any implicit exponential Form, is presented. The model was conceived in order to be used with thin-film photovoltaic modules, whose current–voltage curves are characterised by very smooth shapes. The parameters of the model are evaluated by means of the derivatives of the issued characteristics in the short circuit and open circuit points at standard rating conditions, and assuming that the calculated current–voltage curve contains the rated maximum power point of the simulated panel. The capability of the model to calculate the current–voltage characteristic for values of the solar irradiance and cell temperature far from the standard rating conditions was verified for various thin-film technologies, such as CIS, CIGS, amorphous silicon, tandem and triple-junctions photovoltaic modules. A comparison with the results obtained by another Rational model and other two-diode models, which were used to simulate the electrical behaviour of thin-film photovoltaic modules, is also presented.
R Miceli - One of the best experts on this subject based on the ideXlab platform.
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a procedure to calculate the i v characteristics of thin film photovoltaic modules using an explicit Rational Form
Applied Energy, 2015Co-Authors: R Miceli, Aldo Orioli, Alessandra Di GangiAbstract:Abstract Accurate models of the electrical behaviour of photovoltaic modules are effective tools for system design. One or two diode equivalent circuits have been widely used even though some mathematical difficulties were found dealing with implicit equations. In this paper, a new model based on a simple Rational function, which does not contain any implicit exponential Form, is presented. The model was conceived in order to be used with thin-film photovoltaic modules, whose current–voltage curves are characterised by very smooth shapes. The parameters of the model are evaluated by means of the derivatives of the issued characteristics in the short circuit and open circuit points at standard rating conditions, and assuming that the calculated current–voltage curve contains the rated maximum power point of the simulated panel. The capability of the model to calculate the current–voltage characteristic for values of the solar irradiance and cell temperature far from the standard rating conditions was verified for various thin-film technologies, such as CIS, CIGS, amorphous silicon, tandem and triple-junctions photovoltaic modules. A comparison with the results obtained by another Rational model and other two-diode models, which were used to simulate the electrical behaviour of thin-film photovoltaic modules, is also presented.
Giulio Antonini - One of the best experts on this subject based on the ideXlab platform.
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A GENERAL FRAMEWORK FOR THE ANALYSIS OF METAMATERIAL TRANSMISSION LINES
Progress In Electromagnetics Research B, 2010Co-Authors: Giulio AntoniniAbstract:This paper presents a closed-Form analysis of composite right/left handed transmission lines. The ladder network structure of the transmission line allows to obtain a Rational Form of any two- port network representation. As a consequence of the Rational Form of the transfer functions, poles and residues are easily computed and the dominant ones selected leading to an e-cient time-domain macromodel. The numerical results conflrm the robustness and the accuracy of the proposed method in capturing the physics of composite right/left handed transmission lines.
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Spectral models for 1D blood flow simulations
2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010Co-Authors: Vincenzopio Tamburrelli, Giulio Antonini, Saverio Cristina, Tom Dhaene, Francesco Ferranti, Luc KnockaertAbstract:In this paper we introduce a new theoretical Formulation for the description of the blood flow in the circulatory system. Starting from a linearized version of the Navier-Stokes equations, the Green's function of the propagation problem is computed in a Rational Form. As a consequence, the input-output transfer function relating the upstream and downstream pressure and blood flow is written in a Rational Form as well, leading to a time-domain state-space model suitable for transient analysis. The proposed theoretical Formulation has been validated by pertinent numerical results.
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Parameterized macromodels of multiconductor transmission lines
2009 IEEE Workshop on Signal Propagation on Interconnects, 2009Co-Authors: Giulio Antonini, Tom Dhaene, Francesco Ferranti, Luc KnockaertAbstract:We introduce a novel parametrization scheme for lossy and dispersive multiconductor transmission lines (MTLs) having a cross-section depending on geometrical and physical parameters, that is suitable to interconnect modeling. The proposed approach is based on the dyadic Green's function method for the analysis of lossy and dispersive MTLs which is parameterized by using the Multivariate Orthonormal Vector Fitting (MOVF) technique to build parametric macromodels in a Rational Form. Design parameters, such as substrate or geometrical layout features, in addition to frequency, can be easily handled. The Rational Form of the multi-port macromodel describing the MTL is a direct consequence of the MOVF technique and is especially suited to generate state-space macromodels or to be synthesized into equivalent circuits, which can be easily embedded into conventional SPICE-like solvers. A numerical example is presented providing evidence of the accuracy of the proposed approach in both frequency and time-domain.
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A Spectral Formulation for the Transient Analysis of Plane-Wave Coupling to Multiconductor Transmission Lines
IEEE Transactions on Electromagnetic Compatibility, 2009Co-Authors: Giulio AntoniniAbstract:In this paper, a new spectral Formulation for the transient analysis of plane-wave coupling to multiconductor transmission lines (MTLs) is presented. The proposed approach is fully based on a recently developed technique to represent the Green's function of the second-order telegrapher's equation in a series Rational Form. The use of trigonometric basis functions to model the spatial distribution of voltages allows one to analytically compute the convolution integrals describing the equivalent sources. Furthermore, the Rational Form of the Green's function permits one to handle MTLs with frequency-dependent per-unit-length parameters, leading to a Rational Form of the equivalent sources that can be easily computed and incorporated in nonlinear simulators. Hence, the proposed approach, besides avoiding the problem of mixed time/frequency simulations, provides a rigorous spectral Form of the equivalent sources that is well suited for time-domain analysis. Numerical results are presented for port voltages induced on MTLs by incident plane waves, confirming the accuracy of the proposed method compared to existing techniques based on the inverse fast Fourier transForm.
Aldo Orioli - One of the best experts on this subject based on the ideXlab platform.
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a procedure to calculate the i v characteristics of thin film photovoltaic modules using an explicit Rational Form
Applied Energy, 2015Co-Authors: R Miceli, Aldo Orioli, Alessandra Di GangiAbstract:Abstract Accurate models of the electrical behaviour of photovoltaic modules are effective tools for system design. One or two diode equivalent circuits have been widely used even though some mathematical difficulties were found dealing with implicit equations. In this paper, a new model based on a simple Rational function, which does not contain any implicit exponential Form, is presented. The model was conceived in order to be used with thin-film photovoltaic modules, whose current–voltage curves are characterised by very smooth shapes. The parameters of the model are evaluated by means of the derivatives of the issued characteristics in the short circuit and open circuit points at standard rating conditions, and assuming that the calculated current–voltage curve contains the rated maximum power point of the simulated panel. The capability of the model to calculate the current–voltage characteristic for values of the solar irradiance and cell temperature far from the standard rating conditions was verified for various thin-film technologies, such as CIS, CIGS, amorphous silicon, tandem and triple-junctions photovoltaic modules. A comparison with the results obtained by another Rational model and other two-diode models, which were used to simulate the electrical behaviour of thin-film photovoltaic modules, is also presented.
Yong Chen - One of the best experts on this subject based on the ideXlab platform.
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A new elliptic equation Rational expansion method and its application to the shallow long wave approximate equations
Applied Mathematics and Computation, 2006Co-Authors: Yong Chen, Qi WangAbstract:A new elliptic equation Rational expansion method is presented by a new general ansatz, which is a direct and unified algebraic method for constructing multiple and more general travelling wave solution for nonlinear partial differential equation and implemented in a computer algebraic system. The proposed method is applied to consider the shallow long wave approximate equation and obtains rich new families of the exact solutions, including Rational Form solitary wave, Rational Form triangular periodic, Rational Form Jacobi and Weierstrass doubly periodic solutions.
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a new general algebraic method with symbolic computation to construct new traveling solution for the 1 1 dimensional dispersive long wave equation
International Journal of Modern Physics C, 2005Co-Authors: Yong ChenAbstract:A new algebraic method, named Riccati equation Rational expansion (RERE) method, is devised for constructing multiple traveling wave solutions for nonlinear evolution equations (NEEs). With the aid of symbolic computation, we choose (1 +1)-dimensional dispersive long wave equation (DLWE) to illustrate our method. As a result, we obtain many types of solutions including Rational Form solitary wave solutions, triangular periodic wave solutions and Rational wave solutions.
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Elliptic equation Rational expansion method and new exact travelling solutions for Whitham-Broer-Kaup equations
Chaos Solitons & Fractals, 2005Co-Authors: Yong Chen, Qi WangAbstract:Abstract Based on a new general ansatz and a general subepuation, a new general algebraic method named elliptic equation Rational expansion method is devised for constructing multiple travelling wave solutions in terms of Rational special function for nonlinear evolution equations (NEEs). We apply the proposed method to solve Whitham–Broer–Kaup equation and explicitly construct a series of exact solutions which include Rational Form solitary wave solution, Rational Form triangular periodic wave solutions and Rational wave solutions as special cases. In addition, the links among our proposed method with the method by Fan [Chaos, Solitons & Fractals 2004;20:609], are also clarified generally.
