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Search Results: 1 - 10 of 4249 matches for " Denise Schermann; "
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Corrosion behavior of Ti and TI6Al4V in citrate buffers containing fluoride ions
Schmidt, Anelise Marlene;Azambuja, Denise Schermann;
Materials Research , 2010, DOI: 10.1590/S1516-14392010000100011
Abstract: the effect of fluoride ions concentration on the electrochemical behavior of ti grade 2 and ti6al4v in citrate buffers was studied. open circuit potential (ocp) measurements and voltammetric studies of the samples in the fluoride containing citrate buffers revealed a dissolution process when the ph falls below 5.0 and the naf content is higher than 0.01 m. however, in citrate ph 7.6 the materials showed a passive behavior even in 0.1 m naf. some micrographs of ti grade 2 obtained after longer immersion times in citrate ph 5.0 with 0.01 m naf showed a surface attack. eis (electrochemical impedance sprectroscopy) data obtained at the ocp revealed that the film resistance decreases when the immersion time is increased in ph 5.0 containing 0.1 m naf. in the citrate ph 7.6 the eis data indicated a two-layer model of an oxide film consisting of a more compact inner layer and a porous outer layer. on the other hand, the eis results in citrate ph 4.0 change significantly when the fluoride ions concentration increases from 0.01 to 0.05 m. the electrochemical data revealed that the corrosion behavior of ti grade 2 and ti6al4v in the citrate buffers depends on the ph, the fluoride content and the exposure time.
Electrochemical behavior of Ti and Ti6Al4V in aqueous solutions of citric acid containing halides
Schmidt, Anelise Marlene;Azambuja, Denise Schermann;
Materials Research , 2006, DOI: 10.1590/S1516-14392006000400008
Abstract: this paper reports on an investigation of the electrochemical behavior of ti grade 2 and ti6al4v alloy in aqueous citric acid solutions with ph 2.0 containing halide ions. voltammetric studies of ti and the alloy in citric acid, with and without chloride ions, indicate that the ti and ti alloy presented a passive behavior in the test solutions used. pitting was observed at 3.0 and 2.5 v/sce for ti and ti6al4v, respectively, when bromide ions were added to the solution. in solutions containing fluoride ions, dissolution of the film occurred at potentials close to - 1.0 v/sce in both electrodes. the iodide ions oxidized on the passive oxide film at potentials close to 1.0 v/sce. eis results of the materials in citric acid solutions containing chloride ions revealed that the film's resistance increased as the applied potential rose from 0 to 1.0 v. in bromide-containing solutions, breakdown of the film was confirmed at potentials above 2.0 v/sce in both electrodes. these results suggest film reformation for ti and the alloy in solutions containing fluoride at potentials within the passive region.
Black Wattle Tannin As Steel Corrosion Inhibitor
Rafael Silveira Peres,Eduardo Cassel,Denise Schermann Azambuja
ISRN Corrosion , 2012, DOI: 10.5402/2012/937920
Abstract:
Electrochemical studies of copper, nickel and a Cu55/Ni45 alloy in aqueous sodium acetate
Gon?alves Reinaldo Sim?es,Azambuja Denise Schermann,Lucho Alzira Maria Serpa,Reche Marlisa Piovesan
Materials Research , 2001,
Abstract: This paper discusses the electrochemical behavior of copper, nickel and a copper/nickel alloy in aerated aqueous 0.10 and 1.0 mol L-1 sodium acetate. The data obtained from different electrochemical techniques were analyzed to determine the influence of Ni and Cu on the electrochemical processes of the alloy electrode. The shapes of the potentiodynamic I(E) curves of the alloy were found to be quite similar to those of the Ni voltamograms. Although the anodic current densities of Ni and the alloy increased with greater concentrations of acetate, the opposite effect occurred in Cu. The impedance measurements taken at the open circuit potential revealed that the polarization resistance (R P) of the electrodes decreased in the following order: Ni > Alloy > Cu. With increasing concentrations of acetate, the R P of the alloy and the Cu increased while that of the Ni electrode decreased.
Electrochemical studies of copper, nickel and a Cu55/Ni45 alloy in aqueous sodium acetate
Gon?alves, Reinaldo Sim?es;Azambuja, Denise Schermann;Lucho, Alzira Maria Serpa;Reche, Marlisa Piovesan;Schmidt, Annelise M.;
Materials Research , 2001, DOI: 10.1590/S1516-14392001000200010
Abstract: this paper discusses the electrochemical behavior of copper, nickel and a copper/nickel alloy in aerated aqueous 0.10 and 1.0 mol l-1 sodium acetate. the data obtained from different electrochemical techniques were analyzed to determine the influence of ni and cu on the electrochemical processes of the alloy electrode. the shapes of the potentiodynamic i(e) curves of the alloy were found to be quite similar to those of the ni voltamograms. although the anodic current densities of ni and the alloy increased with greater concentrations of acetate, the opposite effect occurred in cu. the impedance measurements taken at the open circuit potential revealed that the polarization resistance (rp) of the electrodes decreased in the following order: ni > alloy > cu. with increasing concentrations of acetate, the rp of the alloy and the cu increased while that of the ni electrode decreased.
Inquérito de morbi-mortalidade de tétano neonatal no município de Nonoai, RS, 1988
Kmetzseh, Claudete;Mühlen, Denise von;Kornd?rfer, Elena M.;Gomes, Eliana P.;Hunter, Ervin;Silva, Guaraci;Bortoluz, Ines;Sgardela, Maria Tereza;Schermann, Maria Tereza;Loureiro, Regina;
Cadernos de Saúde Pública , 1990, DOI: 10.1590/S0102-311X1990000300007
Abstract: a field inquiry of morbi-mortality was conducted in the district of nonoai, rs, aimed to verify the lack of infantile mortality registries and the subnotiftcation of neonatal tetanus. nine deaths occurred in children aged less than 1 year old (infantile mortality coefficient of 52,6/1000). none of them was known by the regional health service. two cases of neonatal tetanus were confirmed - incidence= 0,88% - both not notified to the health state secretary.
Sensibilidade e aleitamento materno em díades com recém-nascidos de risco
Alfaya, Cristiane;Schermann, Ligia;
Estudos de Psicologia (Natal) , 2005, DOI: 10.1590/S1413-294X2005000200015
Abstract: the purpose of this study was to investigate the relation between the kinds of infant's feeding (breastfeeding, complement and mixed) and the mother-infant interactional behaviors. the participants included 20 dyads of pre-term infant (group i) who had needed intensive care, 14 dyads of full-term infant (group ii) who had needed intensive care, and 24 dyads of full-term health infants (group iii). the risk was considered by the neonatal intensive care needed. the mother-infant interaction was filmed at face-to-face situation and evaluated through mother-infant interaction protocol (schermann et al. 1994) to assess the maternal behaviors, the infant behaviors and the dyads behaviors. results showed that maternal sensitivity was very different between groups (p = 0.039); group iii (control group) had a better maternal sensitivity. therefore maternal sensitivity is better in mothers of full-term health infants, than in mothers of pre-term infant and full-term infant who had needed intensive care. breastfeeding is an important factor to promote a better maternal sensitivity.
Avalia o neuropsicológica do idoso
Luciana Schermann Azambuja
Revista Brasileira de Ciências do Envelhecimento Humano , 2007,
Abstract: O objetivo deste trabalho é descrever a metodologia empregada na avalia o neuropsicológica de idosos e suas contribui es, priorizando aqueles aspectos de interesse dos profissionais da área da saúde, em especial geriatras, psicólogos, psiquiatras, neurologistas. Fonte dos dados: revis o da literatura sobre o tema proposto nos últimos anos e incluídas referências de livros-texto e manuais dos testes imprescindíveis para a compreens o do exame neuropsicológico. Síntese dos dados: o exame neuropsicológico n o se limita à aplica o de testes psicométricos e neuropsicológicos organizados em baterias, mas objetiva, também, avaliar a rela o desses achados com a patologia neurológica e/ou comportamental e em estabelecer a possível área cerebral envolvida. Conclus o: o resultado final deve fornecer um perfil neuropsicológico do paciente, que, combinado à avalia o dos aspectos neurológicos/clínicos, psicológicos e sociais, permitirá auxiliar no seu diagnóstico.
Prevalência e fatores associados à ades?o de crian?as na terapia antirretroviral em três centros urbanos do sul do Brasil
Trombini,Eliana Silva; Schermann,Lígia Braun;
Ciência & Saúde Coletiva , 2010, DOI: 10.1590/S1413-81232010000200018
Abstract: this study verified the prevalence and associated factors to the adhesion of children in highly active antiretroviral therapy (haart), in three urban centers in southern brazil: passo fundo, canoas and cachoeira do sul. the population of the study consisted of 44 children, between 18 months to 13 years old, in haart. data was collected by applying a socio-demographic questionnaire with the caregivers, aiming to know the children's sex, age, schooling, treatment type and clinical state, as well as the caregiver's income, age and schooling. adhesion was considered when the effectiveness of the haart was at least 95% of the prescribed regimen. the design of the study was analytical and transversal. data analysis was performed by descriptive analysis (frequency, percentage) and bivariate analysis (chi-square test), crossing the outcome variable (adhesion to haart) and the independent variables (sociodemographic, clinical state, treatment type, caregiver's age and schooling). the results showed 82% of adhesion in the studied children. the bivariate analysis did not point out significant associations between adhesion and independent variables. a possible linear tendency to increase the adhesion as a function of the improvement of the physical state was observed.
O impacto da depress o materna nas intera es iniciais
Brum, Evanisa Helena Maio,Schermann, Lígia
Psico , 2006,
Abstract: O presente estudo objetiva examinar quest es teóricas a respeito da depress o materna nas intera es iniciais para o desenvolvimento infantil, os estudos apontam para a ocorrência de desordens comportamentais, afetivas, cognitivas e sociais, bem como altera es da atividade cerebral. Salienta-se algumas formas de interven o precoce para dirimir a probabilidade de conseqüências adversas para o desenvolvimento infantil.
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