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Síntese in situ pelo método Pechini de compósitos magnetoelétricos SBN/NFO para o controle do crescimento anormal dos grãos da fase SBN
(Universidade Federal de São Carlos, 2016-10-19) Muñoz Hoyos, José Rodrigo; Garcia, Ducinei; https://lattes.cnpq.br/5236758856687873; Kiminami, Ruth Herta Goldschmidt Aliaga; https://lattes.cnpq.br/7643216999108223; https://lattes.cnpq.br/4742056034033702
A study was made of the synthesis and processing of magnetoelectric particulate composites of strontium barium niobate (SrxBa1-xNb2O6, or simply SBN) as a lead-free piezoelectric phase and nickel ferrite (NFO) as a magnetic phase. The specific objectives of this work were: (i) to obtain SBN (TBT) and NFO phases without impurities during the synthesis of the powders and the densification of the ceramic bodies; (ii) to produce SBN-NFO composites of 0–3 connectivity, i.e., with a highly homogeneous distribution of ferrite phase in the SBN matrix; and (iii) to ensure mechanical interphase coupling based on high densification, without the occurrence of anomalous SBN grain growth. The Sr0.61Ba0.39Nb206/NiFe2O4 biphasic system (SBN61/NFO) was prepared with molar ratios of 50/50, 70/30 and 80/20 by means of in situ chemical synthesis using the Pechini method. The objectives of this work included an analysis and proposal of phase formation during the in situ synthesis of SBN/NFO grain growth, with high chemical homogeneity, a low degree of NFO phase percolation, and 0–3 connectivity. composites. The synthesized powders were analyzed by Rietveld refinement of their X-ray diffraction patterns. This enabled the quantification of spurious phases and revealed the effect of reducing these phases and the abnormal grain growth resulting from the increased proportion of NFO phase. However, the secondary phases could only be determined based on the hypotheses put forward in the proposal of the phase formation model of the SBN/NFO system. This proposed phase formation model enabled us to understand why SBN and NFO phases can be formed simultaneously during in situ synthesis by the Pechini method, and also to conclude that the presence of precipitates during the formation of the polymeric resin may be the cause of spurious phases. This allowed us to propose changes in the synthesis step in order to eliminate possible precipitates, which actually resulted in the reduction of the secondary phases in the tests of the 70/30 system. After sintering, magnetoelectric composites were obtained with a relative density of ~96%, without abnormal grain growth, with high chemical homogeneity, a low degree of NFO phase percolation, and 0–3 connectivity.
Integração de contextos e habilidades pessoais, sociais e profissionais no desenvolvimento de soluções tecnológicas para o profissional da saúde
(Universidade Federal de São Carlos, 2016-10-19) Abib, Janaina Cintra; Anacleto, Junia Coutinho; https://lattes.cnpq.br/6200743168568684; https://lattes.cnpq.br/1482384850101573
This thesis presents a research behind the creation of a process model for application development and a set of guidelines to instruct and support the work of developers focused on healthcare. The current Brazilian condition reflects that the working environment of healthcare professionals in long term care is conducive to the construction of a new identity and reference for these professionals, who incorporate their personal and social activities to professional activities and build cooperative relations with their peers beyond the professional environment. In this context, where healthcare professionals are re-analyzing their relationship with work and issues that affect the quality of life and the quality of their professional activities, the support of technological resources is a strong partner, especially in sharing and disclosure information and also in management daily tasks. In order to incorporate technology requirements that naturally may be included in the workflow of these professionals without interrupt their routines, software developers have been mobilized to create natural interaction applications that help healthcare professionals and promotes the adoption of applications. Natural interactions are defined here as the way users share information using technological resources and applications instinctively, in a transparent way, without concern the peculiarities of the application or technological appeal. For the development of these applications, which considers users’ profiles who naturally mix professional, personal and social contexts, it is required a process model to guide and assist developers in this task. Thus, as scientific contribution in Computer Science, an application development process model and a set of guidelines to supports the developer’s work to create applications for healthcare professionals have been proposed. The proposed model encourages and provides the integration of different contexts of the healthcare professionals, enabling resource appropriation through the perception of abilities and prior knowledge of these professional, and encourages the addition of some new abilities.