Análise das emissões gasosas de um veículo flex funcionando com diferentes combustíveis

Efforts in research and development of new technologies to reduce emission levels of pollutant gases in the atmosphere has intensified in the last decades. In this context, it can be highlighted the modern systems of electronic engine management, new automotive catalysts and the use of renewable fuels which contributes to reduce the environmental impact. The purpose of this study was a comparative analysis of gas emissions from a automotive vehicle, operating with different fuels: natural gas, AEHC or gasoline. To execute the experimental tests, a flex vehicle was installed on a chassis dynamometer equipped with a gas analyzer and other complementary accessories according to the standard guidelines of emission and security procedures. Tests were performed according to NBR 6601 and NBR 7024, which define the urban and road driving cycle, respectively. Besides the analysis of exhaust gases in the discharge tube, before and after the catalyst, using the suction probe of the gas analyzer to simulate the vehicle in urban and road traffic, were performed tests of fuel characterization. Final results were conclusive in indicating leaded gasoline as the fuel which most contributed with pollutant emissions in atmosphere and the usual gasoline being the fuel which less contributed with pollutant emissions in atmosphere

Programa de apoio a planos de reestruturação e expansão das Universidades Públicas Federais (REUNI): repercussões na UFRN

El presente trabajo tiene como objetivo analizar la implantación del Programa de Apoyo a Planes de Reestructuración y Expansión de las Universidades Federales (REUNI) así como su papel en la reconfiguración de la Universidade Federal do Rio Grande do Norte, resaltando sus repercusiones en la gestión y organización de la universidad. Para la realización del trabajo, entre los procedimientos técnicos, utilizamos la revisión de literatura, el análisis de documentos y las entrevistas semiestructuradas. La revisión bibliográfica ha permitido profundizar en conceptos importantes sobre la temática, priorizando los contenidos referentes a los conceptos de globalización y neoliberalismo; La reforma del Estado y sus repercusiones sobre las políticas de educación superior brasileña; directrices de documentos internacionales y nacionales que definieron la organización de este nivel de enseñanza. Los estudios indican, en relación a la expansión de la UFRN, que las metas pactadas del REUNI fueron atendidas casi en su totalidad. Sin embargo, cualitativamente, no se puede afirmar que el REUNI haya tenido un impacto positivo, pues además del incremento de plazas y de la creación de cursos nuevos, que en su mayoría fueron cursos nocturnos, ha habido un aumento sustancial en relación a la cantidad de alumnos por profesor, lo que demuestra que dicho incremento también se da por la racionalización de los recursos humanos y de la estructura físca existentes. Desde esta perspectiva, el REUNI originó varias modificaciones en la forma de gestionar los servicios en la UFRN, mereciendo especial atención la intensificación del proceso de transformaciones en la concepción de una gestión burocrática a una gestión desde la gerencia, resaltando la cultura instituída con el contrato de gestión. En ese sentido, la utilización de las metas y de los indicadores de desempeño pasa a adquirir cada vez más importancia como forma de acompañar y evaluar el cumplimiento de las acciones pactadas, pues de este cumplimiento depende la concesión de recursos financieros. Dentro de este contexto, el Programa se ha caracterizado por dar continuidad a las políticas de privatización para la expansión de la educación superior brasileña, provocando la inserción en las universidades públicas federales, de un modelo de organización fundamentado en el paradigma de la gerencia y la administración, que conlleva así, a la mercantilización de los bienes y servicios académicos

Compósito Polimérico Híbrido: Comportamento Mecãnico, Descotinuidade Geométrica e Resistência Residual

The growing demand in the use of hybrid composite materials makes it essential a better understanding of their behavior face of various design conditions, such as the presence of geometric discontinuities in the cross section of structural elements. This way, the purpose of this dissertation is a study of the mechanical response (strength and stiffness), modes (characteristics) of fracture and Residual Strength of an hybrid polymeric composite with and without a geometric discontinuity in its longitudinal section (with a reduction in the cross section) loaded by uniaxial tension. This geometric discontinuity is characterized by central holes of different diameters. The hybrid composite was fabricated as laminate (plate) and consisting of ortho-tereftalic polyester matrix reinforced by 04 outer layers of Jute fibers bidirectional fabrics and 01 central layer of E-glass bidirectional fabric. The laminate was industrially manufactured (Tecniplas Nordeste Indústria e Comércio Ltda.), obtained by the hand lay-up technique. Initially, a study of the volumetric density of the laminate was made in order to verify its use in lightweight structures. Also were performed comparative studies on the mechanical properties and fracture modes under the conditions of the specimens without the central hole and with the different holes. For evaluating the possible influence of the holes in the structural stability of the laminate, the Residual Strength of the composite was determined for each case of variation in hole diameter. As a complementary study, analyses of the macroscopic final fracture characteristic of the laminates were developed. The presence of the central hole of any sizes, negatively changed the ultimate tensile strength. Regarding the elastic modulus, moreover, the difference found between the specimens was within the range of tests displacement, showing the laminate stability related to the stiffness

Efeito da coesão semântica sobre a discriminação de itens emocionais em testes de memória de reconhecimento de palavras

Highly emotional itens are best remembered in emotional memory tasks than neutral items. An example of emotional item that benefits declarative memory processes are the taboo words. These words undergo from a conventional prohibition, imposed by tradition or custom. Literature suggests that the strongest recollection these words is due to emotional arousal, as well as, the fact that they form a cohesive semantic group, which is a positive additive effect. However, studies with semantic lists show that cohesion can have a negative effect of interference, impairing memory. We analyzed, in two experiments, the effect of arousal and semantic cohesion of taboo words on recognition tests, comparing with into two other word categories: semantically related and without emotional arousal (semantic category) and neutral, with low semantic relation (objects). Our results indicate that cohesion has interfered whith the performance of the test by increasing the number of false alarms. This effect was strongly observed in the semantic category of words in both experiments, but also in the neutral and taboo words, when both were explicitly considered as semantic categories through the instruction of the test in Experiment 2. Despite the impairment induced by semantic cohesion in both experiments, the taboo words were more discriminated than others, and this result agrees with the indication of the emotional arousal as the main factor for the best recollection of emotional items in memory tests

Model-Driven requirements engineering process aided by ontologies and natural controlled languages

Researches in Requirements Engineering have been growing in the latest few years. Researchers are concerned with a set of open issues such as: communication between several user profiles involved in software engineering; scope definition; volatility and traceability issues. To cope with these issues a set of works are concentrated in (i) defining processes to collect client s specifications in order to solve scope issues; (ii) defining models to represent requirements to address communication and traceability issues; and (iii) working on mechanisms and processes to be applied to requirements modeling in order to facilitate requirements evolution and maintenance, addressing volatility and traceability issues. We propose an iterative Model-Driven process to solve these issues, based on a double layered CIM to communicate requirements related knowledge to a wider amount of stakeholders. We also present a tool to help requirements engineer through the RE process. Finally we present a case study to illustrate the process and tool s benefits and usage

Lugar, saúde e informação: os círculos de informação da atenção básica do SUS no contexto na disputa pelo conceito de saúde

Through the analysis of the informational activity at the primary care of SUS at the scale of places, this dissertation has as central objective to observe the dispute for the concepts of health and sickness, in the ambit of Brazilian Health Movement, featuring, on one hand, the clinic, biomedical or flexnerian line hegemonic, scientifically restrict and the primary frame of references for the Brazilian health politics and on the other hand a multiplicity of new proposals and critic thoughts to the current model, which have , as common characteristic, the worry with a territorial way of thinking the health context, therefore beyond the biological processes. On the first chapter we jut out with details these scientific and ideological movements, on a wider way, but also on the specificities of the public health s information politics. On the second chapter we analyze the downward health information circle at the basic care, observing the operational processes of the information s technical systems SIAB and e-SUS. On the third and last chapter, we give references to think about an upward health information circle, centered on the places, ruled by the notions of autonomy, organic solidarity and communicational density. It would possess, as method s primary horizon, the local organization of production and managing of information through the work of the Health Community Agent, privileging therefore the urgency of the most contingent needs of the people in theirs every day s life