Encontrados 6 documentos, a visualizar página 1 de 1
Histologia e caracterização histoquímica do tubo gastrintestinal de Pimelodus m...
Santos,Clarice M.; Duarte,Silvana; Souza,Tatiana G. L.; Ribeiro,Thatiana P.; Sales,Armando; Araújo,Francisco G.As estruturas teciduais do trato gastrintestinal de Pimelodus maculatus La Cepède, 1803, do reservatório de Funil (22º30'-22º35'S; 44º35'- 44º40'W) foram descritas através das técnicas de hematoxilina-eosina (HE), tricômico Gomori, ácido Periódico de Schiff (PAS) e alcian blue (AB) pH 2,5. Objetivou-se a detecção de glicoproteínas (GPs) na mucosa através de uma análise histoquímica e caracterização de possíveis...
SPICE implementation of a finite element method based model for bipolar power s...
Armando Araújo; Adriano CarvalhoThis paper describes the methodology associated with the practical implementation, in SPICE circuit simulator, of a Finite Element Method (FEM) based model developed for Bipolar Power Semiconductor (BPS) simulation. The methodology is based on a modular approach that associates each zone of the semiconductor to a subcircuit implemented into SPICE simulator. Modeling a semiconductor is based in the union of the ...
A method for bipolar semiconductor device modeling implementable in circuit sim...
Armando Araújo; Adriano Carvalho; Jorge Martins de CarvalhoThis paper presents a method for modeling power semiconductor devices based on the unidimensional solution of the diffusion equation describing the behavior of charge in low doped zones. The method uses a variational approach, and the finite elements method, which allows to transform a partial differential equation in space and time into a finite set of differential equations in time only. As the used functiona...
A modular approach for modelling and simulation of semiconductor power devices
Armando Araújo; Adriano Carvalho; Jorge Martins de CarvalhoThis paper presents a modular approach for the modeling and simulation of power semiconductor devices. The novelty of the method is the accurate description of the carrier distribution in the low doped zone using a modular circuit network. This is achieved through the variational reformulation of the ambipolar diffusion equation (ADE) with posterior approximate solution with a finite element approach. The obtai...
Power p-i-n diode modeling using SPICE
Armando Araújo; Adriano Carvalho; Jorge Martins de CarvalhoA physics based model for the power p-i-n diode is implemented into the general circuit simulation package SPICE. This model, based on a variational formulation and finite element solution of the semiconductor equations, accurately describes the forward and reverse recovery, as well as, the conduction behavior. The procedure used to implement the resulting model into SPICE is described. The simu...
A New Method for Solving the Ambipolar Diffusion Equation (ADE) Based on a Fini...
Armando Araújo; Adriano Carvalho; Jorge Martins de CarvalhoThis paper presents a new method for simulation of power bipolar devices. The method is based on the solution of the Ambipolar Diffusion Equation (ADE) with a finite element (FE) approach. This one allows analog solutions for ADE through an equivalent electrical network. So the method could constitute the core for power bipolar devices simulation into any electrical circuit simulator. ; This pa...
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