Uso de hipoclorito de sódio para acelerar a emergência das plântulas e desenvolvimento das mudas de cafeeiro.

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La influencia de huertos agroforestales en la sostenibilidad ambiental, en la soberanía alimentaria y en el empoderamiento de las mujeres de una comunidad de Manaus, Amazonas, Brasil.

Este trabajo evalúo el impacto de la adopción de huertos agroforestales en el empoderamiento de las mujeres y en la sostenibilidad ambiental de una comunidad periurbana de Manaus, Amazonas, Brasil

Screening effects in flow through rough channels

A surprising similarity is found between the distribution of hydrodynamic stress on the wall of an irregular channel and the distribution of flux from a purely Laplacian field on the same geometry. This finding is a direct outcome from numerical simulations of the Navier-Stokes equations for flow at low Reynolds numbers in two-dimensional channels with rough walls presenting either deterministic or random self-similar geometries. For high Reynolds numbers, when inertial effects become relevant, the distribution of wall stresses on deterministic and random fractal rough channels becomes substantially dependent on the microscopic details of the walls geometry. In addition, we find that, while the permeability of the random channel follows the usual decrease with Reynolds, our results indicate an unexpected permeability increase for the deterministic case, i.e., ``the rougher the better''. We show that this complex behavior is closely related with the presence and relative intensity of recirculation zones in the reentrant regions of the rough channel.Comment: 4 pages, 5 figure

Estimação de parâmetros genéticos da produção leiteira e idade ao primeiro parto de vacas Pardo-Suíças por meio de inferência bayesiana.

Estimou-se a herdabilidade e a correlação genética para a produção de leite na primeira lactação (PL) e idade ao primeiro parto (IPP) de animais da raça Pardo-Suíça. Foram utilizados registros de 2.981 lactações, com partos ocorridos entre os anos de 1980 a 2002. Na estimação dos componentes de (co) variâncias foi utilizada a inferência Bayesiana, por meio de amostrador de Gibbs, com tamanho de cadeia de 1.500.000 rounds e período de queima de 500.000 rounds. A frequência de amostragem foi de 500 rounds. As médias estimadas para produção de leite e idade ao primeiro parto foram iguais a 5.347,47±1.849,13 kg e 29,65±4,51 meses, respectivamente. As estimativas de herdabilidade obtidas para a produção de leite e idade ao primeiro parto foram iguais a 0,23 e 0,18, respectivamente. A correlação genética entre elas foi igual a -0,31. As herdabilidades obtidas para as características de desempenho avaliadas indicam que ganhos genéticos satisfatórios podem ser obtidos no melhoramento para essas características e que a seleção simultânea para ambas as características pode ser realizad

Temperature oscillations of magnetization observed in nanofluid ferromagnetic graphite

We report on unusual magnetic properties observed in the nanofluid room-temperature ferromagnetic graphite (with an average particle size of l=10nm). More precisely, the measured magnetization exhibits a low-temperature anomaly (attributed to manifestation of finite size effects below the quantum temperature) as well as pronounced temperature oscillations above T=50K (attributed to manifestation of the hard-sphere type pair correlations between ferromagnetic particles in the nanofluid)

Random Sequential Adsorption: From Continuum to Lattice and Pre-Patterned Substrates

The random sequential adsorption (RSA) model has served as a paradigm for diverse phenomena in physical chemistry, as well as in other areas such as biology, ecology, and sociology. In the present work, we survey aspects of the RSA model with emphasis on the approach to and properties of jammed states obtained for large times in continuum deposition versus that on lattice substrates, and on pre-patterned surfaces. The latter model has been of recent interest in the context of efforts to use pre-patterning as a tool to improve selfassembly in micro- and nanoscale surface structure engineering

A Comparative Evaluation of Two Distributed Hydro-Sedimentological Models in The Semiarid Region of the State of Paraíba, Brazil

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Gravity with extra dimensions and dark matter interpretation: Phenomenological example via Miyamoto-Nagai galaxy

A configuration whose density profile coincides with the Newtonian potential for spiral galaxies is constructed from a 4D isotropic metric plus extra dimensional components. A Miyamoto-Nagai ansatz is used to solve Einstein equations. The stable rotation curves of such system are computed and, without fitting techniques, we recover with accuracy the observational data for flat or not asymptotically flat galaxy rotation curves. The density profiles are reconstructed and compared to that obtained from the Newtonian potential.Comment: 10 pages, 10 figures, submitted to Brazilian Journal of Physic