Desgaste de ferramentas no torneamento com alta velocidade de corte da superliga waspaloy

Nesse trabalho, procurou-se estudar os mecanismos de desgaste de diversas geometrias de ferramentas cerâmicas (Al2O3 + SiCw e Al2O3 + TiC) e ferramentas de PCBN. Para isto foram realizados ensaios de torneamento com alta velocidade de corte em uma superliga à base de níquel (Waspaloy) com dureza de aproximadamente 40 HRC sob condição de corte a seco. As superligas são conhecidas como materiais de difícil usinabilidade devido à alta dureza, alta resistência mecânica em alta temperatura, afinidade para reagir com materiais da ferramenta e baixa condutividade térmica. Os resultados mostraram que o material da ferramenta e a geometria influenciaram o comportamento dos mecanismos de desgaste. de uma maneira geral, o tipo de desgaste dominante foi o de entalhe e os mecanismos foram abrasão, attrition (aderência com arrastamento) e provável difusão na maioria das ferramentas utilizadas.

As possibilidades de uso de ferramentas da informática: software para análise de dados qualitativos e ISD

The objective of the present article is to identify and discuss the possibilities of using qualitative data analysis software in the framework of procedures proposed by SDI (socio-discursive interactionism), emphasizing free distribuited software or free versions of commercial software. A literature review of software for qualitative data analysis in the area of social sciences and humanities, focusing on language studies is presented. Some tools, such as: Wef-tQDA, MLCT, Yoshikoder and Tropes are examined with their respective features and functions. The software called Tropes is examined in more detail because of its particular relation with language and semantic analysis, as well as its embeded classification of linguistic elements such as, types of verbs, adjectives, modalizations, etc. Although trying to completely automate an SDI based analysis is not feasible, the programs appear to be powerful helpers in analyzing specific questions. Still, it seems important to be familiar with software options and use different applications in order to obtain a more diversified vision of the data. It is up to the researcher to be critical of the analysis provided by the machine.

Respostas do sorgo sacarino a N, P e K. II. Características tecnológicas

Foram conduzidos ensaios de campo utilizando-se duas cultivares de sorgo sacarino (Brandes e Rio) cultivadas em dois solos (Latossolo Roxo e Latossolo Vermelho-Escuro textura média), para estudo dos efeitos da aplicação de N, P e K sobre a produção de açúcar e de álcool. Foram avaliados os efeitos das adubações nos teores de sacarose, açúcares redutores, brix, fibra, e produção de álcool do sorgo sacarino. Os ensaios foram conduzidos no município de Barra Bonita, Estado de São Paulo. Com relação à produção de álcool por hectare, a cultivar Brandes respondeu positivamente ao N no LR e ao N e K no LEm, ao passo que a cultivar Rio não apresentou respostas significativas às adubações. As produções de álcool foram explicadas principalmente pelas produções de colmos, o que demonstra ser a produção de álcool por área uma função principalmente da quantidade de caldo produzido, desde que a cultivar apresente características tecnológicas dentro de um limite razoável. Considerando-se os locais e cultivares diferentes, os efeitos das adubações sobre os teores de sacarose, açúcares redutores e brix foram inconsistentes.

Características agronômicas e tecnológicas de genótipos de feijão do grupo comercial Carioca

Cultivars with high yield, adaptability and desirable technological characteristics are a must. The objective of this work was to evaluate agronomic and technologic characters of common bean genotypes from carioca commercial group. Genotypes were cultivated in water growing season, in 2001 and 2002. The experimental design was by randomized blocks with 29 genotypes and four replications. The IAC-Carioca, FT-Bonito, Rudá, Porto Real, CNFC 8008, CNFC 8011, CNFC 8012, CNFC 8013 and CNFC 8156 genotypes yielded above the average. The genotypes IAC-Carioca, CNFC 8012 and CNFC 8156 presented the best results with 3,000 kg ha-1 and 20 minutes cooking time.

Reformas estructurales y brechas tecnológicas

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¿Quo vadis, tecnología de la información y las comunicaciones?: conceptos fundamentales, trayectorias tecnológicas y el estado del arte de los sistemas digitales

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Las nuevas fronteras tecnológicas: los transgénicos y sus impactos en América Latina y el Caribe

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Heterogeneidad estructural, asimetrías tecnológicas y crecimiento en América Latina

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Cambio estructural, conductas tecnológicas y empleo: el tránsito hacia un estudio más complejo de las TIC en la Argentina

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Trayectorias tecnológicas en empresas maquiladoras asiáticas y americanas en México

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Las nuevas fronteras tecnológicas: promesas, desafíos y amenazas de los transgénicos

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Indicadores de capacidades tecnológicas en América Latina

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Assistência Odontológica em Crianças com Paralisia Cerebral e Perspectivas Tecnológicas de Reabilitação

The improvement of oral health and quality of life is closely related to transdisciplinary dialogue, technological development and social responsibility. In patients with cerebral palsy, the lesion of motor areas of the brain compromises the development and function of the craniofacial complex. Considering all the ethiopathogenic conditions, the treatment of such patients involves great difficulties. The dentist and other professionals related to their rehabilitation need to deal with difficulty in chewing, respiration, phonation, besides the poor oral hygiene resulted from abnormal involuntary movements of facial and masticatory musculature, tongue, and upper limb. It is also relevant the lack of understanding about the importance of oral health care due to mental deficits of these individuals. This study aims to review some aspects of oral health in patients with cerebral palsy proposing rehabilitation associated to technology. Few studies concerned about the effectiveness of therapies for oral rehabilitation in patients with cerebral palsy. Laser therapy, electromyography, electrostimulation and LED therapy should be analyzed as options for treatment of patients with cerebral palsy. Following research projects should focus more attention on the dynamic and oral function of these patients to achieve positive repercussions in their overall health. © ArquiMed, 2010.

Impacto de las tendencias sociales, económicas y tecnológicas sobre el transporte público: investigación preliminar en ciudades de América Latina

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Fluorescência da clorofila-a e variação da simetria como ferramentas de investigação de plantas sob estresse

Environmental disturbances in various systems and individuals can result in a tendency for fluctuating asymmetry, which consists of a non-directional deviation from symmetry of a bilateral structure in a normally distributed population. Individuals unable to exhibit plastic responses to developmental disorders that occur at random, either genetic or environmental, may exhibit slight deviations from symmetry in organs with bilateral structure such as leaves. Thus analyzing plants by the morphological pattern of symmetry of the leaves has become an effective tool to describe the developmental of plants under stress conditions. This study aimed to analyze if the pattern of symmetry can be used as a tool to investigate the stress level to which a plant is subjected, using ultraviolet-C radiation (UV-C) as source of stress. We determined the leaf symmetry deviations (sd), the average length (AL) and the maximum width of the lamina (MWL) and the fluorescence parameters of chlorophyll-a in leaves of young plants of G. max subjected to 0, 30, 60, 120 or 240 minutes per week of UV-C during four weeks, submitting the values to ANOVA and Tukey test (p <0.05). The results showed significant reductions in AL and MWL, significant increase in sd in leaves irradiated and a drop in potential quantum yield of photosystem II (PSII) and in the photosynthesis performance index (IP). The analysis of leaf symmetry showed high correlation with the stress level to which plants were submitted, being an important analysis to ascertain the fitness of the plant because it is a noninvasive method and easy to perform.