999 resultados para TB-3
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We report the results of the growth of Cu-Sn-S ternary chalcogenide compounds by sulfurization of dc magnetron sputtered metallic precursors. Tetragonal Cu2SnS3 forms for a maximum sulfurization temperature of 350 C. Cubic Cu2SnS3 is obtained at sulfurization temperatures above 400 C. These results are supported by XRD analysis and Raman spectroscopy measurements. The latter analysis shows peaks at 336 cm-1, 351 cm-1 for tetragonal Cu2SnS3, and 303 cm-1, 355 cm-1 for cubic Cu2SnS3. Optical analysis shows that this phase change lowers the band gap from 1.35 eV to 0.98 eV. At higher sulfurization temperatures increased loss of Sn is expected in the sulphide form. As a consequence, higher Cu content ternary compounds like Cu3SnS4 grow. In these conditions, XRD and Raman analysis only detected orthorhombic (Pmn21) phase (petrukite). This compound has Raman peaks at 318 cm-1, 348 cm-1 and 295 cm-1. For a sulfurization temperature of 450 C the samples present a multi-phase structure mainly composed by cubic Cu2SnS3 and orthorhombic (Pmn21) Cu3SnS4. For higher temperatures, the samples are single phase and constituted by orthorhombic (Pmn21) Cu3SnS4. Transmittance and reflectance measurements were used to estimate a band gap of 1.60 eV. For comparison we also include the results for Cu2ZnSnS4 obtained using similar growth conditions.
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Relatrio final apresentado Escola Superior de Educao de Lisboa para obteno de grau de mestre em Ensino do 1. e 2. Ciclos do Ensino Bsico
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Trabalho Final de Mestrado para a obteno do grau de Mestre em Engenharia Civil na rea de Especializao de Estruturas
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Com a publicao do volume III do Anais da Unidade de Investigao de Educao e Desenvolvimento procurou-se apresentar os principais resultados dos diversos programas e linhas de investigao referentes actividade do ano de 2002. Deste modo, d-se continuidade difuso, entre investigadores e Centros de Investigao, da produo cientfica levada a cabo nesta Unidade e permitir um conhecimento mais sistemtico da evoluo da anlise cientfica e do pensamento educativo nas reas em torno das quais se agrupam as equipas de investigao. Uma informao complementar sobre a organizao da UIED, bem como dos trabalhos de Teses de Doutoramento e de Mestrado realizados na Seco de Cincias e Tecnologias da Educao e Formao com o apoio dos trabalhos investigativos da Unidade, tambm inserida neste volume, tal como ocorreu em volumes anteriores. A todos os Investigadores - Membros da UIED - , Bolseiros e Investigadores Jniores e colaboradores tcnicos e administrativos, bem como aos demais Servios da FCT/UNL que nos apoiam os meus agradecimentos. Coordenadora Cientfica da UIED: Teresa Ambrsio.
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Trabalho de Relatrio de Estgio para obteno do grau de Mestre em Engenharia Civil na rea de Especializao de Edificaes
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OBJECTIVE: Assess the epidemiological aspects of tuberculosis in Brazilian indigenous children and actions to control it. METHODS: An epidemiological study was performed with 356 children from 0 to 14 years of age in Rondnia State, Amazon, Brazil, during the period 1997-2006. Cases of TB reported to the Notifiable Diseases Surveillance System were divided into indigenous and non-indigenous categories and analyzed according to sex, age group, place of residence, clinical form, diagnostic tests and treatment outcome. A descriptive analysis of cases and hypothesis test (χ) was carried out to verify if there were differences in the proportions of illness between the groups investigated. RESULTS: A total of 356 TB cases were identified (125 indigenous, 231 non-indigenous) of which 51.4% of the cases were in males. In the indigenous group, 60.8% of the cases presented in children aged 0-4 years old. The incidence mean was much higher among indigenous; in 2001, 1,047.9 cases/100,000 inhabitants were reported in children aged < 5 years. Pulmonary TB was reported in more than 80% of the cases, and in both groups over 70% of the cases were cured. Cultures and histopathological exams were performed on only 10% of the patients. There were 3 cases of TB/HIV co-infection in the non-indigenous group and none in the indigenous group. The case detection rate was classified as insufficient or fair in more than 80% of the indigenous population notifications, revealing that most of the diagnoses were performed based on chest x-ray. CONCLUSIONS: The approach used in this study proved useful in demonstrating inequalities in health between indigenous and non-indigenous populations and was superior to the conventional analyses performed by the surveillance services, drawing attention to the need to improve childhood TB diagnosis among the indigenous population.
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Trabalho de Dissertao de Natureza Cientfica para obteno do grau de Mestre em Engenharia Civil
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Mestrado em Contabilidade e Anlise Financeira
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O presente artigo...
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Dissertao para obteno do grau de Mestre em Engenharia Civil na rea de Especializao em Estruturas
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Relatrio Final de Estgio apresentado Escola Superior de Dana, com vista obteno do grau de Mestre em Ensino de Dana.
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Relatrio Final de Estgio apresentado Escola Superior de Dana, com vista obteno do grau de Mestre em Ensino de Dana.
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Relatrio Final de Estgio apresentado Escola Superior de Dana, com vista obteno do grau de Mestre em Ensino de Dana.
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Relatrio Final de Estgio apresentado Escola Superior de Dana, com vista obteno do grau de Mestre em Ensino de Dana.
