ABSTRACT This article deals with a study on the icosahedral phase quasicrystal of Al63Cu25Fe12 produced by casting in plasma induction furnace under an argon atmosphere to guarantee it's homogenously. But found in phase transformations from one phase to another, the structures formed by the quasicrystalline alloy having ordered icosahedral phase, leads to low electrical conductivity; but considering the location of weak electron-electron interactions. For microstructural characterization was made using the Following techniques; X-ray Diffraction, Scanning Electron Microscopy, Energy Dispersive Spectroscopy of, DSC Thermal Analysis and Spectroscopy Electron Paramagnetic Resonance (EPR), where the spectrum Obtained experimental EPR presents an amount of resonance g = 2,036. EPR spectrum provide a detailed view of magnetic equivalent sites to those of paramagnetic transition metal compositional variation in the alloy quasicrystalline and transition temperature effects on the magnetic spins in the sample ordering.

Este trabalho teve como proposta produzir a liga amorfa Co87Nb46B15 por moagem mecânica de alta energia. A moagem foi realizada em um moinho planetário modelo: NQM2L Mill pulverizer onde foi inicialmente moído durante 5 horas com uma velocidade de 300 rpm e com jarro/ bolas de aço inoxidável. Os pós moídos foram sujeitos a pré-compactação por prensagem uniaxial, e depois prensagem uniaxial a frio sob vácuo para obter compressão. Os pós cominuídos foram caracterizados quanto ao tamanho e distribuição de tamanho de partícula, a composição química, as fases amorfas e a morfologia que ocorrem durante a moagem e após a consolidação foram avaliadas com auxílio de difração de raios X (DRX), microscopia eletrônica de varredura (MEV) e espectrometria de energia dispersa (EDS) e suas propriedades magnéticas, estudando a curva de histerese. O XRD apresenta um pico principal na forma de halo bastante amplo indicativo do estado amorfo da liga Co87Nb46B15.

Este trabajo tuvo como propuesta la producción de aleación amorfa Co87Nb46B15 por molienda mecánica de alta energía. La molienda se realizó en un planetario modelo molino NQM2L molino pulverizador donde estaba primera planta durante 5 horas a una velocidad de 300 rpm y con el jarro bolas de acero / acero inoxidable. Los polvos molidos se sometieron a pre-compresión por prensado uniaxial y luego fría prensado uniaxial bajo vacío para obtener la compresión. Los polvos de molienda se caracterizaron por el tamaño y distribución de tamaño de partícula, la composición química, las fases amorfas y la morfología que ocurre durante la molienda y después de la consolidación se evaluaron con la ayuda de la difracción de rayos X (XRD), microscopía electrónica de barrido de (SEM) y espectrometría de energía dispersiva (EDS) y sus propiedades magnéticas, el estudio de la curva de histéresis. La XRD muestra un pico principal en forma de muy amplio de halo indicativo de la amplia aleación amorfa Co87Nb46B15.

A liga amorfa Al54Nb45B5 tem um custo extremamente baixo e pode ser aplicada em muitos setores da indústria química e petroquímica porque sua deformação mecânica é alta devido à presença de (Nb ou B), pois a sua deformação mecânica é alta devido à presença de (Nb ou B) no alumínio atuando, principalmente, como refinadores de grão para melhorar suas propriedades mecânicas e térmicas usando a moagem de alta energia. O emprego combinado de nióbio e boro (fases intermetálicas são formadas por meio de adição de pós de Al e Nb), em vez de nióbio ou de boro, individualmente, é uma forma altamente eficaz para refinar o tamanho do grão de liga de Al-Nb-B na sua microestrutura, sem apresentarem um grande número de defeitos e imperfeições em suas estruturas cristalinas. Com esse intuito o presente trabalho comparou o efeito do refino do grão promovido pela adição de nióbio e pela adição do boro na Al54Nb45B5 obtidas por moinho de alta energia sob atmosfera de argônio e analisadas por Difratometria de Raios X (DRX), Microscopia Eletrônica de Varredura e Energia Dispersiva (MEV/EDS).

La aleación amorfa Al54Nb45B5 tiene un costo extremadamente bajo y se puede aplicar en muchos sectores de la industria química y petroquímica porque su deformación mecánica es alta debido a la presencia de (Nb o B), el aluminio que actúa principalmente como refinadores de grano para mejorar sus propiedades mecánicas y térmicas mediante el uso de molienda de alta energía. El uso combinado de niobio y boro (fases intermetálicas se forman mediante la adición de polvos de Nb y Al) en lugar de niobio o de boro, de forma individual, es una forma muy eficaz para refinar el tamaño de grano de la aleación Al-Nb-B en su microestructura, sin proporcionar un gran número de defectos e imperfecciones en sus estructuras cristalinas. . En el presente trabajo se compara el efecto del tamaño de partícula provocado por la adición de niobio y boro en Al54Nb45B5, obtenido en molino de alta energía bajo atmósfera de argón y caracterizado por Difracción de Rayos X (DRX), Microscopía Electrónica de Barrido y Energía Dispersiva (MEB/EDS).

This paper presents a discussion of the processing and characterization of alloy Co87Nb46B15 produced by rapid solidification, in which characterization techniques such as X-Ray Diffraction (XRD), scanning electron microscopy and spectroscopy Dispersion Energy (SEM / EDS) and magnetic properties were used, with the study of hysteresis curve. Several researches have been making on nanocrystalline materials, especially cobalt-base alloys, because of their thermodynamic stability, characterization and processing. Amorphous alloys have a structure of ultrafine, homogeneous grains with small crystal clusters in amorphous phase.

This paper shows a study of Nanocomposite formed by adding reduced Graphene oxide with high acidity and polystyrene. The interest and research in the material is due to the ability of these nanoparticles significantly altering the electrical and mechanical properties of the polymer, even addition of small levels. The existence of functional groups on the graphene oxide containing abundant oxygen such as; epoxy, hydroxyl and carboxylic acid, can be well dispersed in the polymer because of its good interaction with polymer chains. In this study we used the solution by dispersing method to that made the use of solvent tetrahydrofuran (THF), for purposes of obtaining a reaction with functionalization of graphene oxide / polystyrene in time of 48 hours. The analyses of physical-chemical characterizations were made diffraction X-ray (XRD), scanning electron microscopy (SEM), Infrared Spectroscopy (IRD), Thermogravimetric Analysis (TG) and Differential calorimeter by scanning (DSC). The results obtained by XRD diffraction pattern showed a strong expansion in the peak, indicating amorphization on single sheets of graphene oxide due to distorted sp³ sites CO. The morphology of the nanocomposite structure was with surface roughness, folds and rough predominant oxidation process of oxygenated functional groups. Their techniques showed the range of absorption, crystallinity degree and the mass loss. Finally, current and future possible applications of formed polystyrene nanocomposite/ graphene oxide show high acidity efficiency in the use of thin films.

RESUMO Esta pesquisa procurou identificar os fatores que impactam a adoção e implementação do SPED segundo avaliação de gestores de empresas brasileiras, contemplando fatores estabelecidos pelo Modelo TOE, passando pelas dimensões tecnológica, organizacional e ambiental do referido modelo. Através do tratamento estatístico dos dados oriundos da aplicação de uma survey, buscou-se resposta aos objetivos de pesquisa. Detectou-se que, embora existam outros fatores influenciando decisões sobre adoção e implementação do SPED, a obrigatoriedade governamental, enquanto componente do contexto ambiental, demonstrou ser o principal vetor de impacto, isto é, de influência, sobre tais decisões. Isto pareceu decorrer do fato de que o governo ser um dos principais, se não o principal ator do ambiente regulatório.

ABSTRACT This study aims to identify the factors that influence the adoption and implementation of the Public Digital Accounting System (Sistema Público de Escrituração Digital, or SPED) according to the evaluation of managers of Brazilian companies, expressed in response to a survey, based on the criteria established by the TOE framework, considering technological, organizational and environmental dimensions. The results show that although other factors influence decisions about the adoption and implementation of the SPED, government requirement, as a component of the environmental dimension, is the main factor driving those decisions. This seems to result from the fact that the government is a major, if not the main, actor in the regulatory environment. We also identified big expectations of companies regarding the possibility of reducing the volume of ancillary tax obligations (record-keeping and reporting obligations). The ranking generated from the survey is a contribution to the improvement of strategies for implementation of e-government projects, both by governments and companies.

Solid iron can be observed at environmental conditions and also as metallic component of quasicrystalline alloys. Its behavior in aqueous solution is analyzed from some particular thermochemical relationships. The model utilizes free Gibbs energy to obtain pH and ñå parameters which are related to iron redox reactions. The solid iron system, defined as Fe : Fe2+ - Fe3+ - Fe2O3 (hematite) - Fe3O4 (magnetite), was modelled by considering a low molar concentration and environmental temperature. In order to obtain pε values, equations relating Gibbs standard free energy and equilibrium constants were applied. A stability diagram such as pe x pH was chosen to depict these thermochemical relationships. Thus, straight line dpε/dpH slopes were obtained for each process step of the solid iron system. In systems relating solid iron to iron species Fe2+ and Fe3+ the slopes are equal to zero; i.e. horizontal line shows the iron species dominance in some specific pH (hydronium ions) range. The negative values obtained show the pH dependence of the iron species investigated. In natural water environment, it is possible to distinguish hematite formation from magnetite formation. However in quasicrystalline AlCuFe alloys the last iron species formed is hematite which ion pairs to copper. Due to the strong hydronium ions (pH) dependence, it is necessary to measure it both in environmental conditions and quasicrystalline phase's formation. Considering that the temperature adopted was 25°C, the results are valid only for this temperature.

OBJECTIVE: The objective of this retrospective study is to analyze and compare the results of conventional surgical repair and endovascular treatment of blunt aortic injury over the past 8 years. METHODS: Twenty-eight patients (25 male; mean age, 35 years) were treated for blunt aortic injury between April 2001 and March 2009 in a university hospital in Brazil. Twenty-six patients were included in the study: five were treated with operative repair (OR) and 21 with endovascular treatment (TEVAR). Two patients were excluded from analysis: one was managed conservatively, and one was treated with endovascular treatment for chronic dissection related to aortic trauma. RESULTS: Mean age was lower in the OR group than in the endovascular treatment group (17.8 vs. 38 years, P = .003). There was one death in the OR group and four deaths in the endovascular treatment group. Mean follow-up for the overall group was 33.6 months, with 48.7 months (range 8-83 months) for the OR group, and 29.8 months (range 2-91 months) for the TEVAR group. Mean time elapsed from injury to repair was 23.4 hours (range 8-48 h, median 20 h) for the OR group and 30.3 hours (range 2-240 h, median 18 h) for the TEVAR group (P = .374). The duration of surgery was shorter in the endovascular treatment group (142 versus 237 minutes; P = .005). There were no significant differences with respect to the number of postoperative days requiring mechanical ventilation, duration of ICU stay or duration of hospital stay. CONCLUSION: In this retrospective analysis, endovascular treatment was a safe method for repair of blunt aortic trauma, with immediate and midterm results that were comparable to those results obtained with operative repair. No complications from the stent graft were identified during follow-up. Nevertheless, long-term follow-up is necessary to confirm the effectiveness of this treatment.

A doença de Behçet, uma vasculite sistêmica de causa desconhecida, pode ser causa de doença aneurismática da aorta em alguns portadores dessa patologia. Nós apresentamos nossa experiência com dois casos de aneurismas aórticos em pacientes com doença de Behçet submetidos à terapêutica endovascular, descrevendo seus respectivos seguimentos. A terapêutica atual, a patofisiologia e os critérios diagnósticos vigentes foram revisados. Concluímos que a técnica endovascular é uma excelente opção terapêutica para certos pacientes com doença de Behçet e que esta deve ser acompanhada de tratamento imunossupressivo adequado.

Behcet's disease, a systemic vasculitis of unknown etiology, may be the cause of aortic aneurysmal diseases in some patients. We report our experience with two Behcet's disease patients who presented with aortic aneurysms and were submitted to endovascular therapy, and describe their respective follow-ups. Current pathophysiology, diagnosis, and treatment approaches were reviewed. Our experience suggests that the endovascular approach, combined with adequate immunosuppressive treatment, is an excellent therapeutic option for some patients with Behcet's disease suffering from aneurysms.

OBJETIVO: Determinar os níveis de chumbo no sangue de crianças que moravam próximo a uma fundição de chumbo desativada na Cidade de Santo Amaro da Purificação, Estado da Bahia, em setembro de 1998; e identificar fatores associados à variação destes níveis. MÉTODOS: Estudo de corte transversal com crianças de 1 a 4 anos de idade que residiam a menos de 1 km da fundição. Mães ou responsáveis por 47 crianças responderam questionários sobre transtornos do hábito alimentar (comer barro, terra, reboco ou outros materiais) e outros aspectos epidemiológicos relevantes. A concentração de chumbo no sangue foi determinada por espectrofotometria de absorção atômica. RESULTADOS: O nível médio de chumbo foi de 17,1 ± 7,3 mig/dL. Os níveis de chumbo no sangue foram cerca de 5 mig/dL mais elevados em crianças que tinham transtorno do hábito alimentar, independentemente da idade, presença de escória visível no peridomicílio, situação de emprego do pai, história familiar de intoxicação pelo chumbo e desnutrição. CONCLUSÕES: O passivo ambiental da fundição de chumbo, desativada em 1993, permanece como um fator de risco relevante para elevar os níveis desse metal no sangue de crianças, particularmente aquelas que apresentam transtornos do hábito alimentar.

OBJECTIVE: To determine the blood lead levels in children living an inactive lead foundry in the city of Santo Amaro da Purificação,state of Bahia, in September of 1998; and to identify factors associated with differences in these levels. METHODS: Cross-sectional study with children between 1 and 4 years of age living within 1 km of the lead foundry. Mothers or guardians of 47 children answered a questionnaire concerning ingestion of clay, soli, plaster and / or other materias (pica),and other relevant epidemiological aspects. The concentration of lead in blood was determined by atermined by atomic absorption espectrophotometry. RESULTS: The mean lead level was 17.1 ± 7. 3 mug/dL. Blood lead levels were approximately 5 mug/ dl greater amoong children with pica, regardless of age, visible presence of scum surrounding the home, employment status of the father, family history of lead poisoning, and malnutrition. CONCLUSIONS: The environmental legacy of the lead foundry, which was shut down in 1993, continues to represent a relevant risk factor for increased blood lead levels in children, especially those presenting pica.

American cutaneous leishmaniasis (ACL) has been increasing in Pernambuco, thus becoming an important problem for Public Health. The incindence is predominant in the region called "Zona da Mata", in the east of this state. This region corresponds geographically to the primitive area of the Atlantic forest. In order to characterize the eco-epidemiology expression of ACL in this region, two localities situated in the municipalities of Amaraji e Cortes have been selected by the criterion of higher incindence of human cases. Five stocks of patients were characterized and identified on the basis of enzyme profiles as a new variant of Leishmania (V.) braziliensis. A survey of wild and domestic animals was carried out by means of a parasitological and serological diagnosis. Through the analysis of the spleen and liver imprints, were detected amastigotes compatible with Leishmania in five Nectomys s. squamipes, five Bolomys l. pixuna, two Rattus r. alexandrinus and one Rattus r. frugivorus. For two years we carried out monthly sandflies captures using CDC light traps as well as manual captures. Lutzomyia whitmani was predominant, which accounted for 97.4 por cento of the total. These data indicate a strong evidence on the vector and the potential reservoirs of L. braziliensis in this region.