Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2018-08-20T15:16:29Z No. of bitstreams: 1 2009 - Elaine Vieira Lacerda.pdf: 2245011 bytes, checksum: 5a1b3471f7a828b912bae5ca7e93279b (MD5) / Made available in DSpace on 2018-08-20T15:16:29Z (GMT). No. of bitstreams: 1 2009 - Elaine Vieira Lacerda.pdf: 2245011 bytes, checksum: 5a1b3471f7a828b912bae5ca7e93279b (MD5) Previous issue date: 2009-12-18 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / This dissertation has the objective to exam the Sistemic Ideology of the Agroneg?cio in the Brazilian Agribusiness Association, as well as, the action of the mentioned Association in the search for a institutionality formatation favourable to the organizational model broadcasted by the Agribusiness idea, which has been, in the last time, reframed as Sustentable Agricultural. An Exercise that reflects a continous effort to the construction and consolidation of the rural business hegemony in a capital imagetization context, where marketing specialists assume a fundamental role in the conflictive production of consensus. The mentioned object was examined through the Gramscian reference, once that, it permits dealing with the fundamental elements in the apprehension of the process for the construction of the hegemony. In this direction, the ABAG ideologics structures relevances were considered and its authors/actors action in the contest for the brazilian New Rural definition, materialized organically in a System figure. My analysis is in the period that comprehends from 1990 untill 2008. This period is marked by changes, result of the technical agricultural basis modernization, which has impacted profoundely the social relationships. Context in which to think about the power relations identifying the legitimizing basis of one of the politics actors of the brazilian rural business, assumes the strategic function to make us understand a scheme subjected to hybris and marked by the continous fight for hegemony / Esta disserta??o tem como objetivo examinar a Ideologia Sist?mica do Agroneg?cio na Associa??o Brasileira de Agribusiness, bem como a a??o da referida Associa??o na busca pela formata??o de uma institucionalidade favor?vel ao modelo organizacional difundido pelo conceito de Agribusiness o qual tem sido, nos ?ltimos tempos, ressignificado enquanto Agricultura Sustent?vel. Exerc?cio que reflete um esfor?o cont?nuo para a constru??o e consolida??o da hegemonia do empresariado rural num contexto de imagetiza??o do capital, onde especialistas em marketing assumem papel fundamental na produ??o conflitiva do consenso. O referido objeto foi examinado ? luz do referencial gramsciano uma vez que este permite tratar dos elementos fundamentais na apreens?o do processo de constru??o da hegemonia. Nesse sentido, foram consideradas a relev?ncia das estruturas ideol?gicas da ABAG e a a??o de seus autores/atores num contexto de defini??o do Novo Rural brasileiro, organicamente materializado na figura de um Sistema. Minha an?lise encontra-se circunscrita ao per?odo que compreende os anos de 1990 at? o ano de 2008. Per?odo marcado por modifica??es, fruto da moderniza??o de base t?cnica da agricultura, as quais t?m impactado profundamente as rela??es sociais. Contexto no qual refletir sobre as rela??es de poder identificando os fundamentos legitimadores de um dos atores pol?ticos do empresariado rural brasileiro, assume fun??o estrat?gica para compreendermos um regime sujeito ? hybris e marcado pela constante luta por hegemonia

Die Dissertation erforscht die Unsicherheit, Sensitivität und Grenzen großskaliger Erosionsmodelle. Die Modellierung basiert auf der allgemeinen Bodenabtragsgleichung (ABAG), Sedimenteintragsverhältnissen (SDR) und europäischen Daten. Für mehrere Regionen Europas wird die Bedeutung der Unsicherheit topographischer Modellparameter, ABAG-Faktoren und kritischer Schwebstofffrachten für die Anwendbarkeit empirischer Modelle zur Beschreibung von Sedimentfrachten und SDR von Flusseinzugsgebieten untersucht. Der Vergleich alternativer Modellparameter sowie Kalibrierungs- und Validierungsdaten zeigt, dass schon grundlegende Modellentscheidungen mit großen Unsicherheiten behaftet sind. Zur Vermeidung falscher Modellvorhersagen sind kalibrierte Modelle genau zu dokumentieren. Auch wenn die geschickte Wahl nicht-topographischer Algorithmen die Modellgüte regionaler Anwendungen verbessern kann, so gibt es nicht die generell beste Lösung. Die Ergebnisse zeigen auch, dass SDR-Modelle stets mit Sedimentfrachten und SDR kalibriert und evaluiert werden sollten. Mit diesem Ansatz werden eine neue europäische Bodenabtragskarte und ein verbessertes SDR-Modell für Einzugsgebiete nördlich der Alpen und in Südosteuropa abgeleitet. In anderen Regionen Europas ist das SDR-Modell bedingt nutzbar. Die Studien zur jährlichen Variabilität der Bodenerosion zeigen, dass jahreszeitlich gewichtete Niederschlagsdaten geeigneter als ungewichtete sind. Trotz zufriedenstellender Modellergebnisse überwinden weder sorgfältige Algorithmenwahl noch Modellverbesserungen die Grenzen europaweiter SDR-Modelle. Diese bestehen aus der Diskrepanz zwischen modellierten Bodenabtrags- und maßgeblich zur beobachteten bzw. kritischen Sedimentfracht beitragenden Prozessen sowie der außergewöhnlich hohen Sedimentmobilisierung durch Hochwässer. Die Integration von nicht von der ABAG beschriebenen Prozessen und von Starkregentagen sowie die Disaggregation kritischer Frachten sollte daher weiter erforscht werden. / This dissertation thesis addresses the uncertainty, sensitivity and limitations of large-scale erosion models. The modelling framework consists of the universal soil loss equation (USLE), sediment delivery ratios (SDR) and European data. For several European regions, the relevance of the uncertainty in topographic model parameters, USLE factors and critical yields of suspended solids for the applicability of empirical models to predict sediment yields and SDR of river catchments is systematically evaluated. The comparison of alternative model parameters as well as calibration and validation data shows that even basic modelling decisions are associated with great uncertainties. Consequently, calibrated models have to be well-documented to avoid misapplication. Although careful choices of non-topographic algorithms can also be helpful to improve the model quality in regional applications, there is no definitive universal solution. The results also show that SDR models should always be calibrated and evaluated against sediment yields and SDR. With this approach, a new European soil loss map and an improved SDR model for river catchments north of the Alps and in Southeast Europe are derived. For other parts of Europe, the SDR model is of limited use. The studies on the annual variability of soil erosion reveal that seasonally weighted rainfall data is more appropriate than unweighted data. Despite satisfactory model results, neither the careful algorithm choice nor model improvements overcome the limitations of pan-European SDR models. These limitations are related to the mismatch of modelled soil loss processes and the relevant processes contributing to the observed or critical sediment load as well as the extraordinary sediment mobilisation during floods. Therefore, further research on integrating non-USLE processes and heavy-rainfall data as well as on disaggregating critical yields is needed.