Simulation for competition of languages with an ageing sexual population

Recently, individual-based models originally used for biological purposes revealed interesting insights into processes of the competition of languages. Within this new field of population dynamics a model considering sexual populations with ageing is presented. The agents are situated on a lattice and each one speaks one of two languages or both. The stability and quantitative structure of an interface between two regions, initially speaking different languages, is studied. We find that individuals speaking both languages do not prefer any of these regions and have a different age structure than individuals speaking only one language.Comment: submitted to International Journal of Modern Physics

Estimativa do custo de produção de café agroecológico no Município de Alto Paraíso - Rondônia.

Considerando a necessidade de se gerar informações socioeconômicas que contribuam para o delineamento de agroecossistemas sustentáveis, objetivo deste trabalho é a determinação do custo de produção do café robusta em sistema agroecológico no Município de Alto Paraíso, Rondônia. Pretende-se ainda determinar a renda auferida por uma unidade de produção típica do sistema café-mel-madeira.bitstream/item/24715/1/cot317-cafeagroecologico.pd

ESO 603-G21: A strange polar-ring galaxy

We present the results of B, V, R surface photometry of ESO603-G21 - a galaxy with a possible polar ring. The morphological and photometric features of this galaxy are discussed. The central round object of the galaxy is rather red and presents a nearly exponential surface brightness distribution. This central structure is surrounded by a blue warped ring or disk. The totality of the observed characteristics (optical and NIR colors, strong color gradients, HI and H_2 content, FIR luminosity and star-formation rate, rotation-curve shape, global mass-to-luminosity ratio, the agreement with the Tully-Fisher relation, etc.) shows that ESO603-G21 is similar to late-type spiral galaxies. We suppose that morphological peculiarities and the possible existence of two large-scale kinematically-decoupled subsystems in ESO603-G21 can be explained as being a result of dissipative merging of two spiral galaxies or as a consequence of a companion accretion onto a pre-existing spiral host.Comment: 8 pages, Astron. Astrophys, accepte

Forest genetic resources in the Amazon tropical forests: legal forestry framework, divergences of use and considerations for conservation.

Address the issue of possible uses of Amazon forest species , with regard to non-timber products . Aborda a questão das possibilidades de uso de espécies florestais amazônicas, no que se refere aos produtos não-madeireiros

Prática educomunicativa socioambiental aplicada em reunião com produtores extrativistas na Resex Chico Mendes, Acre.

O registro dessa experiência tem por objetivo contribuir para a validação do uso de músicas amazônicas como recurso didático de educomunicação científica e ambiental na educação não formal. Em novembro de 2011, a música ?Canto dos Castanhais? serviu de base para as discussões processadas em reunião que teve por objetivo apresentar e propor para extrativistas de castanha-do-brasil no Acre, a validação das diretrizes do Ministério do Meio Ambiente para o manejo da castanha na política de produtos da sociobiodiversidade. Esta atividade está relacionada às ações de educomunicação do Projeto Kamukaia/Repensa, coordenado pela Embrapa, que visa gerar soluções tecnológicas para o manejo sustentável de produtos florestais não madeireiros

Running Gluon Mass from Landau Gauge Lattice QCD Propagator

The interpretation of the Landau gauge lattice gluon propagator as a massive type bosonic propagator is investigated. Three different scenarios are discussed: i) an infrared constant gluon mass; ii) an ultraviolet constant gluon mass; iii) a momentum dependent mass. We find that the infrared data can be associated with a massive propagator up to momenta $\sim 500$ MeV, with a constant gluon mass of 723(11) MeV, if one excludes the zero momentum gluon propagator from the analysis, or 648(7) MeV, if the zero momentum gluon propagator is included in the data sets. The ultraviolet lattice data is not compatible with a massive type propagator with a constant mass. The scenario of a momentum dependent gluon mass gives a decreasing mass with the momentum, which vanishes in the deep ultraviolet region. Furthermore, we show that the functional forms used to describe the decoupling like solution of the Dyson-Schwinger equations are compatible with the lattice data with similar mass scales.Comment: Version to appear in J. Phys. G. New version include some rewriting and new analysis. In particular, the section on the running mass is ne