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Mecanismos reacionais dos sistemas Pb/H2SO4 e Pb/PbO2/H2SO4
(Universidade Federal de São Carlos, 2012-01-26) Fernandes, Fabio Plut; D'Alkaine, Carlos Ventura; https://lattes.cnpq.br/8699821828310072; https://lattes.cnpq.br/4836435433244717
The thesis will address a modern view of electrochemistry for the discharge and charge reactions of Lead Acid Batteries study. Even though these batteries have existed for more than 200 years, electrochemical mechanisms are still not fully understood. Recently, there is a discussion in Brazil about the need to improve energy accumulation processes that have not kept pace with the development of technologies such as electric car engines, telephony devices, computers. The production of lead-acid batteries is the only Brazilian energy accumulator. These Batteries continue to grow worldwide, increasing their forms of use, leaving the current car starter batteries and stationary stabilizers for hybrid cars (micro and medium hybrid), electric motorcycles, electric trains, mobile phone towers, oil platforms, among others. In this thesis, we started a critical review of the published data bibliography and its meanings. Most of the published work proposes that the mechanisms of unloading and loading the plates are by dissolving precipitation and would be similar. However, studies with negative and positive flat electrodes show almost no dissolution during these electrochemical reactions. Thus, the precipitation dissolution mechanism would not be justified. In the last decades, several studies already indicate that these mechanisms can be understood as solid-state mechanisms by adding the partial disruption phenomenon, which we will explore in this thesis. The literature data shows differences between the negative and positive plates mechanisms that need modern treatments because their discharge products are different films and from nanometer order. Finally, electrochemical and analytical studies will be carried out, with positive and negative flat electrodes. Experimental methods for negative flat electrodes are treated in detail, while positive flat electrodes still have a lot to be developed.
Funcionalidade familiar: um estudo com idosos institucionalizados
(Universidade Federal de São Carlos, 2012-01-26) Oliveira, Simone Camargo de; Pavarini, Sofia Cristina Iost; https://lattes.cnpq.br/1983620301963081; https://lattes.cnpq.br/8872055732480380
Culturally, care delivered to elderly individuals in Brazil is usually provided by families. Even though only 1% of the Brazilian population older than 60 years of age is cared for in long stay institutions, the search for this type of facility has increased, mainly due to population aging and new family arrangements. This study analyzes the relation between family functionality and the variables of age, gender, duration of institutionalization, family composition, depressive symptoms and cognitive changes in elderly individuals residing in long stay facilities in a city in the interior of São Paulo, SP, Brazil. This is a quantitative cross- sectional study with a descriptive correlational design. A total of 107 elderly individuals were individually interviewed using the following: Family APGAR, Mini State Mental Exam, Katz Index, Pfeffer Functional Activities Questionnaire and Geriatric Depression Scale. Outcomes were analyzed by logistic regression analysis using the hierarchical analysis using the Stepwise technique. This study complied with all ethical aspects. In relation to socio-demographic characteristics, the institutionalized elderly individuals were mostly older elderly women (61%), (45%)with a low education level, (87%) Catholic and (45%) widowed. Most independently performed basic daily living activities (46%), but were dependent for instrumental activities of daily living, had depressive symptoms (67%) and cognitive impairment (53%). The results show that 57% of the elderly individuals had a high level of family dysfunction, 22% had good family functionality and 21% moderate family dysfunction. No statistically significant association was found between the family APGAR and the variables gender and age. Elderly individuals with families composed of more distant relatives such as siblings, nephews and nieces, with greater time of institutionalization, depressive symptoms and cognitive impairment were also more dysfunctional. The institutionalization of elderly with time over 3 years (OR = 3.861, p = 0.0285), presence of depressive symptoms (OR = 5.378, p = 0.0044) and family composition formed by brothers / Nephews / Other (OR = 6.812, p = 0.0155) are more likely to experience family dysfunction. These findings can contribute to planning for care delivered to the family of institutionalized families.