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Caracterização dos processos eletroquímicos em filmes automontados de poli(o-metoxianilina) e poli(ácido-3-tiofeno acético)
(Universidade Federal de São Carlos, 2003-05-19) Strixino, Francisco Trivinho; Souza, Ernesto Chaves Pereira de; https://lattes.cnpq.br/1505400360366643; https://lattes.cnpq.br/9740223649776400
In this work, the electrochemical characterization of a self-assembled film containing two conductive polymers, poly(o-methoxyanilina)(POMA) and poly(3- thiophene acetic acid)(PTAA), is presented. The technique that allows to obtain these films is known as layer-by-layer (LBL) deposition. It consists in a spontaneous adsorption of species with opposite charges. The technique used for the electrochemical characterization was cyclic voltammetry coupled with mass variation using an electrochemical quartz crystal microbalance (EQCM), which allows the characterization of the LBL film mass/charge transport during the redox process. Electroacoustic impedance experiments of the LBL films with different number of bilayers show that the viscoelastic and mechanic tension properties do not change significantly in the potential range studied. Therefore, allowing the use of the Sauerbrey equation for converting the frequency values in mass values. The charge compensation mechanism was determined using the species flux (ions+solvent molecules) compared with POMA those casting films. The POMA-PTAA LBL film presents a charge compensation mechanism due to simultaneous intercalation of cations and anions. This behavior suggests the existence of a pseudo-self-doping mechanism related to carboxilic lateral groups interactions through the alternating layers structure of POMA-PTAA. The charge in the deprotonated carboxilic groups neutralize the charge generation of the imina groups present in the POMA backbone, which gives a decrease of the total mass change of the film. In this sense, the LBL technique could be an alternative method to prepare conducting polymer films modifying their electrochemistry properties.
Uma ferramenta da apoio à engenharia reversa orientada a objetos de legados - FAROOL
(Universidade Federal de São Carlos, 2003-05-19) Prado, Milene; Penteado, Rosângela Aparecida Dellosso; https://lattes.cnpq.br/4061946080136286
This project objectives the development of a support tool to the reverse engineering process for procedimental legacy systems implemented in COBOL, in order to be facilitating their recovery. The FAROOL (Ferramenta de Apoio à engenharia Reversa Orientada a Objetos de Legados) is a guide to software engineers in the reverse engineering process that is based on pre-defined heuristics, so that guided models to the objects are obtained from systems implemented in COBOL. FAROOL addresses two phases, in special, in the process of object guided reverse engineering. The first phase is the Elaboration of the MASA (Modelo de Análise do Sistema Atual, when a legacy systems model of pseudoguided objects is created. The second phase is of MAS Elaboration (Modelo de Análise do Sistema), when a totally model of guided objects is create, being based on the previous model (MASA). By applying the FAROOL, the software engineers are guided so that the reverse engineering process is materialized. First, the preparation of the system is made, aid of the Legacy Aid CASE tool, integrated to the FAROOL tool through macros.They follow the determination of the candidates classes, of the candidates attributes and of the candidates methods of the MASA model, that can become candidates to the class, to the attributes and to the methods, respectively, of the MAS model. Special heuristics are followed for the confection of the relationships between the candidate class in the model of guided objects. All the information are stored in a relational database, facilitating to the task of the software engineer in the reverse engineering process. The Delphi environment; the relational database Interbase; and the Legacy Aid tool were used in the elaboration of the FAROOL.