O extrativismo da castanha-do-brasil na região do Baixo Rio Branco, RR.

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Estimativa de mitigação de gases de efeito estufa em sistemas silvipastoris no bioma Pampa.

O objetivo foi o de estimar o potencial de mitigação de gases de efeito estufa pelo crescimento das árvores em sistemas silvipastoris com eucalipto estabelecidos em pastagens nativas em áreas de pecuaristas familiares, na região de Bagé (RS). Foi realizada a definição do regime de manejo mais rentável por material genético, espaçamento e grupo de solo e efetuado o cálculo da mitigação de gases de efeito estufa seguindo as condicionantes para a obtenção do selo Carne Carbono Neutro. Concluiu-se que os sistemas apresentam grande potencial para gerar retorno econômico e mitigar as emissões dos animais gerando um excedente de carbono que poderia ser utilizado para a remuneração dos produtores por serviços ambientais

The Theoretical Astrophysical Observatory: Cloud-Based Mock Galaxy Catalogues

We introduce the Theoretical Astrophysical Observatory (TAO), an online virtual laboratory that houses mock observations of galaxy survey data. Such mocks have become an integral part of the modern analysis pipeline. However, building them requires an expert knowledge of galaxy modelling and simulation techniques, significant investment in software development, and access to high performance computing. These requirements make it difficult for a small research team or individual to quickly build a mock catalogue suited to their needs. To address this TAO offers access to multiple cosmological simulations and semi-analytic galaxy formation models from an intuitive and clean web interface. Results can be funnelled through science modules and sent to a dedicated supercomputer for further processing and manipulation. These modules include the ability to (1) construct custom observer light-cones from the simulation data cubes; (2) generate the stellar emission from star formation histories, apply dust extinction, and compute absolute and/or apparent magnitudes; and (3) produce mock images of the sky. All of TAO's features can be accessed without any programming requirements. The modular nature of TAO opens it up for further expansion in the future.Comment: 17 pages, 11 figures, 2 tables; accepted for publication in ApJS. The Theoretical Astrophysical Observatory (TAO) is now open to the public at https://tao.asvo.org.au/. New simulations, models and tools will be added as they become available. Contact [email protected] if you have data you would like to make public through TAO. Feedback and suggestions are very welcom

Growth and energy quality of eucalyptus wood in different crop-livestock-forest spatial arrangements.

Crescimento e qualidade energética da madeira do eucalipto em diferentesarranjos de integração lavoura-pecuária-floresta.O objetivo do trabalho foi avaliar o crescimento e a qualidade energética da madeira de materiais genéticos de eucalipto em diferentes arranjos espaciais de plantio em sistema de integração lavoura-pecuária-floresta em Barra-do-Garças (MT). Foram avaliados cinco materiais genéticos de Eucalyptus spp em oito arranjos de plantio aos 76 meses de idade. As características avaliadas foram o crescimento em diâmetro, altura, volume, mortalidade, produção de massa seca, relação cerne e alburno, fator de forma, volume de casca, densidade básica, poder calorífico superior, teor de cinzas, voláteis, carbono fixo e energia no tronco. Os dados foram avaliados através do ajuste de uma função de crescimento, teste de identidade de modelos e ANOVA, com comparações de médias por Scott-Knott. Os clones de híbridos de Eucalyptus grandis x Eucalyptus urophylla apresentaram melhor desempenho para a produção de energia na região de Barra-do-Garça (MT), o que se deveu a maior produtividade volumétrica que foi determinante na estimativa de energia disponível por árvore e área plantada.O crescimento, a forma do tronco e a densidade básica variaram entre e dentro de um mesmo material genético em função do arranjo espacial de plantio.O mesmo não ocorreu com as propriedades energéticas da madeira como o poder calorífico superior, o teor de cinzas, carbono fixo e voláteis. Palavras-chave: Curva de crescimento, densidade básica, poder calorífico, agrofloresta, Brasil. Abstract: The aim of the present study was to assess the growth and energetic properties of genetic material of eucalyptus grown in several integrated crop-livestock system spatial arrangements in Barra-do-Garças City (MT). The genetic material of 76-month old Eucalyptus spp from eight spatial arrangements were assessed according to the following properties: diameter, height and volume growth, mortality rate, dry matter yield, sapwood to heartwood ratio, form factor, bark volume, basic density, superior calorific value, ash content, volatile matter, fixed carbon and trunk energy. Data analysis was performed by adjusting growth function, test for model identity and parameters equalityand ANOVA tests to Scott-Knott?s mean clustering test. Eucalyptus grandisx E. urophyllaclones from recorded the highest energy efficiency due to their high yieldvolume, which was decisiveto determine estimated energy available per tree and cropland area. Growth, stem shape and basic density varied among,and within,the same genetic materials, depending ontheir respective spatial arrangement. However, solid biomass properties (high calorific value, ash content, fixed carbon and volatile matter) remained stable.Keywords:Growth curve, basic density, calorific value, agroforestry, Brazil

Semi-Analytic Galaxy Evolution (SAGE): Model Calibration and Basic Results

This paper describes a new publicly available codebase for modelling galaxy formation in a cosmological context, the "Semi-Analytic Galaxy Evolution" model, or SAGE for short. SAGE is a significant update to that used in Croton et al. (2006) and has been rebuilt to be modular and customisable. The model will run on any N-body simulation whose trees are organised in a supported format and contain a minimum set of basic halo properties. In this work we present the baryonic prescriptions implemented in SAGE to describe the formation and evolution of galaxies, and their calibration for three N-body simulations: Millennium, Bolshoi, and GiggleZ. Updated physics include: gas accretion, ejection due to feedback, and reincorporation via the galactic fountain; a new gas cooling--radio mode active galactic nucleus (AGN) heating cycle; AGN feedback in the quasar mode; a new treatment of gas in satellite galaxies; and galaxy mergers, disruption, and the build-up of intra-cluster stars. Throughout, we show the results of a common default parameterization on each simulation, with a focus on the local galaxy population.Comment: 15 pages, 9 figures, accepted for publication in ApJS. SAGE is a publicly available codebase for modelling galaxy formation in a cosmological context, available at https://github.com/darrencroton/sage Questions and comments can be sent to Darren Croton: [email protected]

Two tricritical lines from a Ginzburg-Landau expansion: application to the LOFF phase

We study the behavior of the two plane waves configuration in the LOFF phase close to T=0. The study is performed by using a Landau-Ginzburg expansion up to the eighth order in the gap. The general study of the corresponding grand potential shows, under the assumption that the eighth term in the expansion is strictly positive, the existence of two tricritical lines. This allows to understand the existence of a second tricritical point for two antipodal plane waves in the LOFF phase and justifies why the transition becomes second order at zero temperature. The general analysis done in this paper can be applied to other cases.Comment: LaTex file, 15 pages, 6 figure

O Manejo e a Produção da Acacia mangium em Roraima.

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