On quasi-Jacobi and Jacobi-quasi bialgebroids

We study quasi-Jacobi and Jacobi-quasi bialgebroids and their relationships with twisted Jacobi and quasi Jacobi manifolds. We show that we can construct quasi-Lie bialgebroids from quasi-Jacobi bialgebroids, and conversely, and also that the structures induced on their base manifolds are related via a quasi Poissonization

Estacionalidade na atividade sexual e qualidade do sêmen nos ovinos deslanados das raças Santa Inês e Somalis brasileira.

Resumo: Em dez ovinos deslanados das racas Santa Ines e Somalis brasileira, sendo cinco de cada, foi coletado e ejaculado espermatico, atraves da vagina artificial, durante um ano. O objetivo foi avaliar a atividade sexual do macho ovino, nas condicoes do Nordeste brasileiro, no periodo seco (agosto a dezembro de 1983) e chuvoso (janeiro a maio de 1984) e as diferencas entre racas. Na avaliacao do esperma houve uma diferenca (P<0,001) entre racas, a Santa Ines mostrando maior volume e concentracao do que a Somalis brasileira. Nao se obtiveram diferencas quanto a porcentagem de espermatozoides vivos e motilidade progressiva. Na epoca seca, o volume e a concentracao foram menores que na epoca chuvosa (P<0,001). Porem a porcentagem de espermatozoides vivos e a motilidade nao apresentaram diferencas quanto as epocas. A patologia espermatica nao foi diferente quanto as racas e epocas, mostrando niveis relativamente altos para alcancar uma taxa de fertilidade. As racas Santa Ines e Somalis brasileira se mostraram perfeitamente adaptadas as condicoes climaticas e nutricionais do Nordeste brasileiro, quanto a sua atividade sexual.bitstream/item/36444/1/BP-08.pd

Comparación del crecimiento, propiedades del suelo y análisis químico del follaje entre masas puras y mixtas

Ecosystems with mixed species compared to the ones with pure compositions provide a broader range of options in the fields of biodiversity, conservation, protection and restoration. Industrial plantations in Portugal are mostly monocultures with the predominance of coniferous forests, so the introduction of broadleaves could be important for the biodiversity and sustainability of Portuguese forests. This study aims to present and discuss field data from pure and mixed-species plantations of European chestnut (Castanea sativa Mill.) and douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] with different intercropping densities in a total of 5 treatments with two replicate blocks. In respect to growth, the results showed significant difference (P &lt; 0.05, Scheffe) between treatments for survival and basal area. Diameter breast height (DBH), total and top height of the individual Castanea tree was positively affected by the presence of Pseudotsuga. In general, soil properties results showed a higher fertility for mixed treatments compared with pure ones. Statistically differences (P &lt; 0.05, Scheffe) were observed in pH, P, Mn and in the exchangeable acidity. Results for foliar analysis in N, P, Ca and K concentrations are higher for mixed treatments. The obtained results from this study indicate that mixed plantations have a positive effect in the productivity of the Castanea.Los ecosistemas con especies mixtas, en comparación con las masas puras, proporcionan una gama más amplia de opciones en el campo de la biodiversidad, la conservación, la protección y la restauración. Las plantaciones industriales de Portugal son en su mayoría monocultivos con predominio de bosques de coníferas, por lo que la introducción de frondosas podría ser importante para la biodiversidad y la sostenibilidad de los bosques portugueses. Este estudio tiene como objetivo presentar y discutir los datos de campo de plantaciones puras y mixtas de especies de castaño y de abeto de Douglas con diferentes densidades de cultivo intercalado en un total de 5 tratamientos con dos bloques. En lo que respecta al crecimiento, los resultados mostraron diferencias significativas (P &lt; 0,05) entre los tratamientos para la supervivencia y el área basal. El diámetro normal (DAP), la altura total y la altura dominante del Castaño se vio afectado positivamente por la presencia de Pseudotsuga. En general, las propiedades del suelo mostraron una mayor fecundidad de los tratamientos mixtos en comparación con los puros. Se observaron diferencias estadísticamente significativas (P &lt; 0,05) en el pH, P, Mn y en la acidez intercambiable. Los resultados de los análisis foliares de N, P, Ca y la concentración de K son mayores para los tratamientos mixtos. Los resultados obtenidos de este estudio indican que las plantaciones mixtas tienen un efecto positivo en la productividad del Castaño

Tempo de ovulação em cabras (sem raça definida) sincronizadas com esponjas vaginais de FGA (acetato de fluorogesterona) e superovuladas com PMSG. (Resultados preliminares).

Resultados preliminares, indicam que a inseminação natural ou artificial em cabras sincronizadas, criadas em regime semi-extensivo, deve ser feita acima de 37 horas após a retirada da esponja ou acima de 11 horas após o início do estro, quando ocorre a ovulação

On virialization with dark energy

We review the inclusion of dark energy into the formalism of spherical collapse, and the virialization of a two-component system, made of matter and dark energy. We compare two approaches in previous studies. The first assumes that only the matter component virializes, e.g. as in the case of a classic cosmological constant. The second approach allows the full system to virialize as a whole. We show that the two approaches give fundamentally different results for the final state of the system. This might be a signature discriminating between the classic cosmological constant which cannot virialize and a dynamical dark energy mimicking a cosmological constant. This signature is independent of the measured value of the equation of state. An additional issue which we address is energy non-conservation of the system, which originates from the homogeneity assumption for the dark energy. We propose a way to take this energy loss into account.Comment: 15 pages, 5 figures. Accepted for publication in JCA

Three-body description of direct nuclear reactions: Comparison with the continuum discretized coupled channels method

The continuum discretized coupled channels (CDCC) method is compared to the exact solution of the three-body Faddeev equations in momentum space. We present results for: i) elastic and breakup observables of d-12C at E_d=56 MeV, ii) elastic scattering of d-58Ni at E_d=80 MeV, and iii) elastic, breakup and transfer observables for 11Be+p at E_{11Be}/A=38.4 MeV. Our comparative studies show that, in the first two cases, the CDCC method is a good approximation to the full three-body Faddeev solution, but for the 11Be exotic nucleus, depending on the observable or the kinematic regime, it may miss out some of the dynamic three-body effects that appear through the explicit coupling to the transfer channel.Comment: 12 pages, 10 figures, accepted for publication in Physical Review