Uncertainties inherent in the decomposition of a Transformation

This contribution adds to the points on the <indeterminacy of special relativity> made by De Abreu and Guerra. We show that the Lorentz Transformation can be composed by the physical observations made in a frame K of events in a frame K-prime viz i) objects in K-prime are moving at a speed v relative to K, ii) distances and time intervals measured by K-prime are at variance with those measured by K and iii) the concept of simultaneity is different in K-prime compared to K. The order in which the composition is executed determines the nature of the middle aspect (ii). This essential uncertainty of the theory can be resolved only by a universal synchronicity as discussed in [1] based on the unique frame in which the one way speed of light is constant in all directions.Comment: 10 pages including an appendix. Published in the European Journal of Physics as a Comment. Eur. J. Phys. 29 (2008) L13-L1

Hydrographic conditions along the western Iberian margin during marine isotope stage 2

The surface water hydrography along the western Iberian margin, as part of the North Atlantic's eastern boundary upwelling system, consists of a complex, seasonally variable system of equatorward and poleward surface and subsurface currents and seasonal upwelling. Not much information exists to ascertain if the modern current and productivity patterns subsisted under glacial climate conditions, such as during marine isotope stage (MIS) 2, and how North Atlantic meltwater events, especially Heinrich events, affected them. To help answer these questions we are combining stable isotope records of surface to subsurface dwelling planktonic foraminifer species with sea surface temperature and export productivity data for four cores distributed along the western and southwestern Iberian margin (MD95-2040, MD95-2041, MD99-2336, and MD99-2339). The records reveals that with the exception of the Heinrich events and Greenland Stadial (GS) 4 hydrographic conditions along the western Iberian margin were not much different from the present. During the Last Glacial Maximum (LGM), subtropical surface and subsurface waters penetrated poleward to at least 40.6°N (site MD95-2040). Export productivity was, in general, high on the western margin during the LGM and low in the central Gulf of Cadiz, in agreement with the modern situation. During the Heinrich events and GS 4, on the other hand, productivity was high in the Gulf of Cadiz and suppressed in the upwelling regions along the western margin where a strong halocline inhibited upwelling. Heinrich event 1 had the strongest impact on the hydrography and productivity off Iberia and was the only period when subarctic surface waters were recorded in the central Gulf of Cadiz. South of Lisbon (39°N), the impact of the other Heinrich events was diminished, and not all of them led to a significant cooling in the surface waters. Thus, climatic impacts of Heinrich events highly varied with latitude and the prevailing hydrographic conditions in this region

Associação entre produtividade média de grãos e a herdabilidade em populações de feijoeiro oriundas do cruzamento entre linhagens elite.

O objetivo deste trabalho é verificar se no cruzamento de linhagens de alta performance é possível ter variabilidade genética suficiente para se ter sucesso com a seleção avaliando progênies após algumas gerações de autofecundação

Cultivo de embrião para o resgate de espécies silvestres de arroz.

O objetivo desse trabalho foi comparar a viabilidade de sementes de quatro espécies de arroz silvestre (O. glumaepatula, O. grandiglumis, O. alta e O. latifolia) armazenadas no Banco Ativo de Germoplasma da Embrapa Arroz e Feijão, por cultivo de embrião.Apresentação oral - graduação

Semeadura direta a lanço na reforma de pastagens degradadas no Estado do Acre.

Diante de um dos maiores problemas da Amazônia que é a degradação das pastagens, o presente estudo objetivou definir a melhor taxa e época de semeadura direta de Brachiaria brizantha cv. Xaraés em uma estratégia de plantio direto para reforma de pastagem. O delineamento experimental foi blocos casualizados com quatro repetições e os tratamentos arranjados em esquema fatorial 4x3, com quatro densidades de semeadura de B. brizantha cv. Xaraés (4, 8, 16 e 32 kg/ha de sementes puras germináveis) e três épocas de semeadura (1, 14 e 28 dias após a dessecação). O estande inicial da cv. Xaraés e plantas daninhas foram avaliados aos 28 dias após a semeadura. A composição botânica, altura do pasto e a massa seca dos componentes da pastagem, foram avaliados aos 98 dias após a semeadura. A semeadura um dia após a dessecação teve resultados muito ruins, com estande inicial de apenas 0,25 plântulas de cv. Xaraés por m² na primeira avaliação. A semeadura aos 14 dias resultou em uma pastagem com maior percentual da cv. Xaraés e menor percentagem de plantas daninhas na segunda avaliação. O estande de plantas da cv. Xaraés aos 28 dias após a semeadura aumentou linearmente com o aumento da densidade de semeadura. Dessa forma o melhor momento de semeadura direta da cv. Xaraés é aos 14 dias após a dessecação e um mínimo de 8 kg ha de sementes puras germináveis da cv. Xaraés é necessário para resultados satisfatórios na reforma de pastagens degradadas por este método no estado do Acre

Embrapa e as pesquisas de apoio à produção de ovos.

Projeto: 11.11.11.111

Young peoples’ reflections on what teachers think about family obligations that conflict with school: A focus on the non-normative roles of young caring and language brokering

In “Western” contexts school attendance is central for an ‘ideal’ childhood. However, many young people engage with home roles that conflict with school expectations. This paper explores perceptions of that process in relation two home activities - language brokering and young caring. We interviewed 46 young people and asked them to reflect on what the teacher would think when a child had to miss school to help a family member. This paper discusses the young people’s overall need to keep their out-of-school lives private from their teachers

Questions and Remarks About Clans in Multiparticle Dynamics

The fact that several important effects in multiparticle dynamics, on which QCD has not yet satisfactory predictions, have been interpreted in terms of the validity of negative binomial (Pascal) regularity and related clan properties at the level of simpler substructures, raises intriguing questions on clan properties in all classes of collisions, the main one being whether clans are observable objects or merely a mathematical concept. We approach this problem by studying clan masses and rapidity distributions in each substructure for e+e- annihilation and hh collisions, and find that such properties can indeed characterise the different components. These results support the idea that clans could be observable, a challenging problem for future experiments.Comment: 11 pages; 3 figures; latex 2e and amsmat

Seleção de linhagens de feijão resistentes à antracnose, grãos tipo carioca e outros fenótipos desejáveis.

o objetivo desse trabalho foi identificar entre as linhagens resistentes à antracnose, oriundas de um programa de retrocruzamentos, as mais promissoras, com alta produtividade, tipo de grãos Carioca, resistência à mancha angular e porte ereto