Anisotropy and percolation threshold in a multifractal support

Recently a multifractal object, $Q_{mf}$, was proposed to study percolation properties in a multifractal support. The area and the number of neighbors of the blocks of $Q_{mf}$ show a non-trivial behavior. The value of the probability of occupation at the percolation threshold, $p_{c}$, is a function of $\rho$, a parameter of $Q_{mf}$ which is related to its anisotropy. We investigate the relation between $p_{c}$ and the average number of neighbors of the blocks as well as the anisotropy of $Q_{mf}$

Are Neutron-Rich Elements Produced in the Collapse of Strange Dwarfs ?

The structure of strange dwarfs and that of hybrid stars with same baryonic number is compared. There is a critical mass (M~0.24M_sun) in the strange dwarf branch, below which configurations with the same baryonic number in the hybrid star branch are more stable. If a transition occurs between both branches, the collapse releases an energy of about of 3x10^{50} erg, mostly under the form of neutrinos resulting from the conversion of hadronic matter onto strange quark matter. Only a fraction (~4%) is required to expel the outer neutron-rich layers. These events may contribute significantly to the chemical yield of nuclides with A>80 in the Galaxy, if their frequency is of about one per 1500 years.Comment: Accepted for publication in IJMP

Avaliação da aderência pneu-pavimento para diferentes tipos de pavimentos utilizando o International Friction Index (IFI)

A condição superficial do pavimento é um fator importante para a avaliação da segurança viária por caracterizar diretamente os níveis de atrito, que condicionam as frenagens veiculares. No intuito de padronizar os diversos indicadores de aderência, desenvolveu-se o International Friction Index (IFI). O principal objetivo deste método é quantificar o atrito superficial, reportando-o como um índice em escala que possa ser utilizado internacionalmente. Neste contexto, o presente estudo tem como objetivo avaliar a aderência pneu-pavimento para diferentes tipos de pavimentos utilizados no Brasil. Para isso, consolidou-se um extenso banco de dados, obtidos a partir da revisão da literatura, de microtextura e de macrotextura, englobando aproximadamente dez técnicas diferentes de pavimentação. Desta análise, obtiveram-se curvas que correlacionam coeficiente de atrito e a velocidade, observando-se a preponderância da macrotextura do material no desempenho da aderência pneu-pavimento.Pavement’s surface condition is a key parameter to evaluate traffic safety because it directly characterizes friction levels, related to the quality of vehicular braking. Defined by both micro- and macrotexture, different techniques applied to determine skid resistance are documented in the literature. In order to standardized skid resistance, International Friction Index (IFI) was developed. Its main goal is to quantify frictional coefficient, reporting it as a single-scale indicator, which can be assessed worldwide. In this context, this paper’s mean objective is to assess skid resistance for different paving techniques. For that, an extent database of micro- and macrotexture was collected from the literature, counting on more than 10 different paving techniques. From this analysis, curves of frictional coefficient versus speed were plotted, observing macrotexture’s preponderance on skid resistance performance.info:eu-repo/semantics/publishedVersio

Resistência do solo à penetração sob vegetação nativa e pastagem cultivada no Pantanal Sul-Mato-Grossense.

Este trabalho teve por objetivo avaliar as alterações na resistência do solo à penetração em razão da conversão da vegetação arbórea nativa em pastagem cultivada no Pantanal Sul-Mato-Grossense. The objective of this work was to evaluate the alterations in soil resistance to penetration due to conversion of natural tree vegetation into cultivated pasture in the Pantanal wetlands, at south of Mato Grosso, Brazil

Confinement of bosonic and spinning particles in braneworlds

In this manuscript we study the confinement of bosonic and spinning test particles in smooth Randall-Sundrum models. For this, we show that it is possible to find an effective potential which describe the motion of the particle over the extra dimension. For the bosonic case it is a known fact that free test particles cannot be localized neither in thin nor thick branes. Recently, a coupling to a scalar field has been used to localize a limited range of masses. Up to now, no mechanism has been found that can trap test particles of any mass over the brane. To solve this, we show that a coupling with the dilaton can trap particles of any mass. Next we analyze the spinning particle. The spin variables $\psi^{P}$ introduces an interaction with the curvature Riemann tensor. This introduces a correction to the effective potential. By analyzing it, we find that the spinning particle can be localized at a position different of the brane. We also show that a spinning particle over the brane can escape to infinity. Therefore, we can conclude that free bosonic and spinning particles are not trapped to the brane

Biologia de Heliothis virescens (Lepidoptera: Noctuidae) em folhas de soja (Glycine max).

Este estudo teve como objetivo determinar a influencia na biologia de Heliothis virescens do consumo exclusivo de folhas e a capacidade de consumo foliar.Pôster - graduação