Strategies for Optimize Off-Lattice Aggregate Simulations

We review some computer algorithms for the simulation of off-lattice clusters grown from a seed, with emphasis on the diffusion-limited aggregation, ballistic aggregation and Eden models. Only those methods which can be immediately extended to distinct off-lattice aggregation processes are discussed. The computer efficiencies of the distinct algorithms are compared.Comment: 6 pages, 7 figures and 3 tables; published at Brazilian Journal of Physics 38, march, 2008 (http://www.sbfisica.org.br/bjp/files/v38_81.pdf

Critical Approaches Towards (A New) Arts Education

Arts education still strives to claim its specificity and equal relevance comparing to other kinds of knowledge. There remains an idea that arts are powerful transformative agents, but neoliberalism tends to put economic utility and usage as principles that capture art under the great jargons of creativity, cultural industries, or flexibility. Today, it is necessary to question the very concept and status that arts, but also education, built from European perspectives, aligned with colonial practices, the building of nations, identity constructions and a culture of taste, under a universalist idea of civilization and progress. Thus, in this JSTA special issue we aim to question how to critically build a place and status for arts education which does not assume for itself, from the outset, a privileged or exceptional place, which does not reproduce the hegemonic power relations it seeks to criticize, and which stimulates change instead of accommodation and homogenization

Fisher matrix forecasts for astrophysical tests of the stability of the fine-structure constant

We use Fisher Matrix analysis techniques to forecast the cosmological impact of astrophysical tests of the stability of the fine-structure constant to be carried out by the forthcoming ESPRESSO spectrograph at the VLT (due for commissioning in late 2017), as well by the planned high-resolution spectrograph (currently in Phase A) for the European Extremely Large Telescope. Assuming a fiducial model without $\alpha$ variations, we show that ESPRESSO can improve current bounds on the E\"{o}tv\"{o}s parameter---which quantifies Weak Equivalence Principle violations---by up to two orders of magnitude, leading to stronger bounds than those expected from the ongoing tests with the MICROSCOPE satellite, while constraints from the E-ELT should be competitive with those of the proposed STEP satellite. Should an $\alpha$ variation be detected, these measurements will further constrain cosmological parameters, being particularly sensitive to the dynamics of dark energy.Comment: Phys. Lett. B (in press

Aplicação da PCAM e da análise de agrupamento em clones de cupuaçuzeiro.

O objetivo deste trabalho foi estudar a divergência genética de 50 clones de cupuaçuzeiro, por meio da PCAM e da Análise de Agrupament