Diretrizes do sistema plantio direto no contexto da agricultura conservacionista.

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Gestão conservacionista de solo e de água em escala de microbacia hidrográfica: estudo de caso.

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Soil chemical management drives structural degradation of Oxisols under a no-till cropping system.

Made available in DSpace on 2018-07-06T01:17:20Z (GMT). No. of bitstreams: 1 PSoilChemicalsoilresearch....pdf: 615207 bytes, checksum: ec842638c37dea1ce182d8cd03f82c9f (MD5) Previous issue date: 2017-12-11bitstream/item/179426/1/P-Soil-Chemical-soil-research....pd

Microstructure and magneto-dielectric properties of the chitosan/gelatin-YIG biocomposites

This work is devoted to the preparation of yttrium iron garnet (YIG) ferrimagnetic biocomposites based in biodegradable chitosan and gelatin. The aim was to produce composite films containing controlled amounts of YIG to obtain a new biological material with magneto-dielectric features. Structural characterization of the biocomposites was made by scanning electron microscopy, X-ray diffraction, infrared absorption spectroscopy and thermal analysis, while the dielectric and magnetic properties were obtained from dielectric spectroscopy and magnetic hysteresis loops, respectively. The versatility of the films obtained makes them possible candidates for use as biomaterials or electronic device

Latin American platform comparative critical analysis. Learning from the KASSA platforms' reports.

1 CD-ROM. Projeto DG-Research - Contract nº GOCE-CT-2004-505582

Chitosan-magnetite nanocomposite as a sensing platform to bendiocarb determination

A novel platform for carbamate-based pesticide quantification using a chitosan/magnetic iron oxide (Chit-Fe3O4) nanocomposite as a glassy carbon electrode (GCE) modifier is shown for an analytical methodology for determination of bendiocarb (BND). The BND oxidation signal using GCE/Chit-Fe3O4 compared with bare GCE was catalyzed, showing a 37.5% of current increase with the peak potential towards less positive values, showing method's increased sensitivity and selectivity. Using square-wave voltammetry (SWV), calibration curves for BND determination were obtained (n = 3), and calculated detection and quantification limits values were 2.09 × 10-6 mol L-1 (466.99 ppb) and 6.97 × 10-6 mol L-1 (1555.91 ppb), respectively. The proposed electroanalytical methodology was successfully applied for BND quantification in natural raw waters without any sample pretreatment, proving that the GCE/Chit-Fe3O4 modified electrode showed great potential for BND determination in complex samples. ᅟ Graphical abstract.The authors gratefully acknowledge the funding provided by the following Brazilian agencies: CNPq-INCT (proc. 573925/2008-9 and 573548/2008-0), CAPES/Funcap (2133/2012/proc. 23038.007973/2012-90 and PNE-0112-00048.01.00/16), CNPq (proc. 400223/2014-7, 303596/2014-7, 302801/2014-6 and 408790/2016-4), PRONEM/FUNCAP/CNPq (PNE-0112-00048.01.00/16) and PRONEX/Funcap (proc. PR2-0101-00030.01.00/15). The Fundação para a Ciência e a Tecnologia (FCT) and the FEDER, under Programme PT2020 (Project UID/QUI/50006/2013) and the project Qualidade e Segurança Alimentar- uma abordagem (nano) tecnológica (NORTE-01-0145-FEDER-000011) are also acknowledged for the financial funding. R.M.F. and J.C.D. acknowledge the financial support by Fondecyt 3170240 and Basal Program for Centers of Excellence, Grant FB0807 CEDENNA, CONICYT. C.P.S. thanks CAPES-PNPD for her grant.info:eu-repo/semantics/publishedVersio

Theory of the anomalous Hall effect from the Kubo formula and the Dirac equation

A model to treat the anomalous Hall effect is developed. Based on the Kubo formalism and on the Dirac equation, this model allows the simultaneous calculation of the skew-scattering and side-jump contributions to the anomalous Hall conductivity. The continuity and the consistency with the weak-relativistic limit described by the Pauli Hamiltonian is shown. For both approaches, Dirac and Pauli, the Feynman diagrams, which lead to the skew-scattering and the side-jump contributions, are underlined. In order to illustrate this method, we apply it to a particular case: a ferromagnetic bulk compound in the limit of weak-scattering and free-electrons approximation. Explicit expressions for the anomalous Hall conductivity for both skew-scattering and side-jump mechanisms are obtained. Within this model, the recently predicted ''spin Hall effect'' appears naturally

Uma resposta conservacionista: o impacto do sistema plantio direto.

Diante do problema degradação dos recursos ambientais, especialmente das terras agrícolas que vem contribuindo para a inadimplência de produtores rurais, êxodo rural, inchamento e favelização urbana, tem-se verificado no Brasil um princípio de reação da sociedade na busca de formas mais adequadas de conduzir o desenvolvimento e as atividades econômicas, gerando expectativas de alcance de uma agricultura competitiva e comprometida em prover eqüidade social, respeito ao ambiente e segurança alimentar. Neste contexto, alguns programas de manejo conservacionistas de solo e de água têm sido conduzidos com sucesso. Em geral, esses programas têm considerado fundamentos básicos (aumento da capacidade de infiltração de água no solo e da cobertura do solo e práticas comunitárias de controle à erosão) que têm permitido o desenvolvimento do Sistema Plantio Direto no âmbito de bacias hidrográficas, com grandes reflexos positivos na qualidade do solo, da água e da vida dos envolvidos.bitstream/item/212696/1/Uma-resposta-conservacionista-o-impacto-do-sistema-plantio-direto-2002.pd