Herbicidas registrados para a cultura do eucalipto.

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USING BEM TO PREDICT THE EFFECTIVE THERMAL CONDUCTIVITY FOR HETEROGENEOUS MATERIALS

This work presents a study on the effective thermal conductivity in material with heterogeneous composition in two dimensions. The Boundary Elements Method (BEM) is used to solve the steady state potential equations. The sub regions technique was implemented in order to take into account the effects of these inclusions inside the domain. In the numerical implementation, the inclusions are randomly generated in a Representative Volume Element (RVE) domain. The Average Field Theory is used to predict the effective properties (macroscopic) of the material with heterogeneous composition. The material is characterized by a specified volume fraction as well as the inclusion’s size. The samples are composed of square domains with defined number of randomly distributed inclusions and submitted to a condition of unidirectional heat conduction. Each set of samples is analyzed several times in order to guarantee statistical stability of the result

Atributos químicos de solo relacionados à população e danos do nematoide das lesões radiculares em soja.

O objetivo deste trabalho foi determinar a relação entre alguns atributos químicos de solo e a população e os danos ocasionados por P. brachyurus à soja

Processes controlling atmospheric dispersion through city centres

We develop a process-based model for the dispersion of a passive scalar in the turbulent flow around the buildings of a city centre. The street network model is based on dividing the airspace of the streets and intersections into boxes, within which the turbulence renders the air well mixed. Mean flow advection through the network of street and intersection boxes then mediates further lateral dispersion. At the same time turbulent mixing in the vertical detrains scalar from the streets and intersections into the turbulent boundary layer above the buildings. When the geometry is regular, the street network model has an analytical solution that describes the variation in concentration in a near-field downwind of a single source, where the majority of scalar lies below roof level. The power of the analytical solution is that it demonstrates how the concentration is determined by only three parameters. The plume direction parameter describes the branching of scalar at the street intersections and hence determines the direction of the plume centreline, which may be very different from the above-roof wind direction. The transmission parameter determines the distance travelled before the majority of scalar is detrained into the atmospheric boundary layer above roof level and conventional atmospheric turbulence takes over as the dominant mixing process. Finally, a normalised source strength multiplies this pattern of concentration. This analytical solution converges to a Gaussian plume after a large number of intersections have been traversed, providing theoretical justification for previous studies that have developed empirical fits to Gaussian plume models. The analytical solution is shown to compare well with very high-resolution simulations and with wind tunnel experiments, although re-entrainment of scalar previously detrained into the boundary layer above roofs, which is not accounted for in the analytical solution, is shown to become an important process further downwind from the source

Antimicrobial activity of essential oil from some Verbenaceae and Asteraceae from Brazilian Cerrado.

ISEO. PP10

Development of a feasibility model for a High Speed Rail (HSR) line project

The building costs of a High Speed Rail line project besides its acquisition, operation and maintenance ones, are very high making it an expensive option of transportation. The implementation of a HSR project must then be evaluated, determining its costs and revenues, in order to justify its viability. This research proposes a model to evaluate the feasibility of a HSR line. The model considers the cases where the demand and the costs have uncertainties, assuming also that the initial evaluated demand can be overestimated. A detailed explanation of the proposed model is given and empirical results for the Brazilian HSR project are discussed. The results show that such a project is a very risky one, and it must be carefully discussed before it becomes a reality

Análise da estrutura populacional e determinação do fluxo gênico entre populações de arroz vermelho.

objetivo do trabalho foi caracterizar geneticamente populações de arroz vermelho do RS com suspeita de resistência aos herbicidas imidazolinonas e elucidar aspectos relacionados ao fluxo gênico de sementes entre diferentes locais

Reflexões sobre a policy making e avaliação em política pública

This article is a reflection on the policy making and evaluation processes in Public Policy in the light of the work written by Howlett et al, and the understanding given by the authors researched by them on the cycles and subsystems that comprise the processes of Public Policy. To understand about the decision-making of these processes, we studied the author Lindblom, to figure out who the political actors are and how they influence the government’s decision-making. About the Public Policy theory and its typologies, it was necessary to read TJ Lowi and his publication in 1964. Finally, we dealt on how to evaluate a Public Policy with the authors Maria Cecilia Barreira and Maria do Carmo Carvalho regarding the perspectives of evaluation of policies and social programs, Elizabeth Rico about the evaluation processes and Klauss Frey with regard to the conceptual reflections, assessments and their implication for the Brazilian political situation.Este artículo es una reflexión sobre los procedimientos de formulación de políticas y evaluación de las políticas públicas a la luz de la obra escrita por Howlett et al, y la comprensión de los datos, los autores realizaron búsquedas para ellos en los ciclos y los subsistemas que componen los procesos política pública. Para entender acerca de la toma de decisiones de estos procesos se estudió Lindblom autor, para entender quiénes son los actores políticos y cómo estos influyen en la toma de decisiones del gobierno. En la teoría de la Política Pública y sus tipologías, leyendo TJ Lowi era necesaria y su publicación en 1964. Por último, nos ocupamos de formas de evaluar una política pública de los autores, María Cecilia Barreira y Maria do Carmo en Carvalho respetar los puntos de vista de la evaluación de políticas y programas sociales. Elizabeth Rico, en relación con la evaluación y Klauss Frey procesos en las reflexiones conceptuales, las evaluaciones y sus implicaciones para la situación política brasileña.O presente artigo faz uma reflexão sobre a policymaking e os processos de avaliação em Política Pública sob a luz dos trabalhos escritos por Howlett et al, e os entendimentos dados, pelos autores pesquisados por eles, sobre os ciclos e subsistemas que compreendem os processos de Política Pública. Para entender sobre a tomada de decisão desses processos, foi estudado o autor Lindblom, para compreendermos quem são os atores políticos e como estes influenciam nas tomadas de decisões governamentais. Sobre a teoria da Política Pública e suas tipologias, fez necessária a leitura de T.J. Lowi e sua publicação de 1964. Para finalizar, tratamos sobre as formas de avaliação de uma Política Pública com os autores, Maria Cecília Barreira e Maria do Carmo Carvalho, no que tange as perspectivas da avaliação de políticas e programas sociais. Elizabeth Rico, sobre os processos avaliativos e Klauss Frey sobre as reflexões conceituais, dessas avaliações e suas implicações para a situação política brasileira