Influência da técnica e da origem do propágulo na enxertia de campo em erva-mate (Ilex paraguariensis Saint Hilaire).

Como subsídio para o aprimoramento da qualidade da madeira de Pinus elliottii Engelm var. elliottii, plantado no sul do Brasil, foram estudados os efeitos de diferentes intensidades de desbaste em algumas de suas principais propriedades. Em função do aumento da intensidade de desbaste, observaram- se tendências de aumento da densidade básica, teor de lenho tardio, espessura dos anéis de crescimento, ângulo de inclinação das fibras e diâmetros externo einterno (lúmen) dos traqueóides. O comprimento dos traqueóides e os coeficientes de retratibilidade revelaram tendências inversas. Os teores de pentosana, lignina e celulose não foram significativamente influenciados pelo desbaste. A resistência à flexão estática apresentou seus maiores valores na madeira produzida nas parcelas submetidas a desbaste moderado, nas quais 25% da área basal foi removida

Turbulence generation by a shock wave interacting with a random density inhomogeneity field

When a planar shock wave interacts with a random pattern of pre-shock density non-uniformities, it generates an anisotropic turbulent velocity/vorticity field. This turbulence plays an important role at the early stages of the mixing process in the compressed fluid. This situation emerges naturally in shock interaction with weakly inhomogeneous deuterium-wicked foam targets in Inertial Confinement Fusion (ICF) and with density clumps/clouds in astrophysics. We present an exact small-amplitude linear theory describing such interaction. It is based on the exact theory of time and space evolution of the perturbed quantities behind a corrugated shock front for a single-mode pre-shock non-uniformity. Appropriate mode averaging in 2D results in closed analytical expressions for the turbulent kinetic energy, degree of anisotropy of velocity and vorticity fields in the shocked fluid, shock amplification of the density non-uniformity, and sonic energy flux radiated downstream. These explicit formulas are further simplified in the important asymptotic limits of weak/strong shocks and highly compressible fluids. A comparison with the related problem of a shock interacting with a pre-shock isotropic vorticity field is also presented.Comment: This article corresponds to a presentation given at the Second International Conference and Advanced School "Turbulent Mixing and Beyond," held on 27 July - 07 August 2009 at the Abdus Salam International Centre for Theoretical Physics, Trieste, Italy. That Conference Proceeding will be published as a Topical Issue of the Physica Scripta IOP scienc

Use of galvanostatic coulometry in the analysis of arbidol drug

Arbidol is proved to easily and completely react with electrogenerated bromine in the ratio 2: 9; so procedures for the arbidol quantification in the neat substance and drugs are developed, the RSD value does not exceed 2%. A procedure for the coulometric determination of water in the arbidol substance using the Fisher method is proposed. © 2012 Pleiades Publishing, Ltd