Natural Disturbances
Mostrando 13-24 de 52 artigos, teses e dissertações.
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13. Avaliação da produção de sedimento na bacia hidrográfica do rio Potengi através do modelo SWAT
Anthropic disturbances in watersheds, such as inappropriate building development, disorderly land occupation and unplanned land use, may strengthen the sediment yield and the inflow into the estuary, leading to siltation, changes in the reach channel conformation, and ecosystem/water quality problems. Faced with such context, this study aims to assess the ap
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/12/2010
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14. DESENVOLVIMENTO DE MODELOS ALOMÉTRICOS PARA ESTIMAR BIOMASSA E CARBONO DE MUDAS DE ESPÉCIES ARBÓREAS, EM ÁREAS ATINGIDAS POR TEMPESTADES DE VENTO EM MANAUS (AM)
Usando um arquivo de dados com 504 indivíduos arbóreos pertencentes à regeneração natural (de 30 cm em altura e DAP <5 cm), foram testados dez modelos alométricos, sendo cinco logarítmicos e cinco não lineares para estimar a biomassa seca total de mudas em pé. Os dados foram coletados de forma destrutiva, na região de Manaus (AM), em um sítio de f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/05/2010
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15. CARACTERIZAÇÃO FLORÍSTICA, DIVERSIDADE E CORRELAÇÃO AMBIENTAL NA FLORESTA NACIONAL DE SÃO FRANCISCO DE PAULA, RS / FLORISTIC CHARACTERIZATION, DIVERSITY AND ENVIRONMENTAL CORRELATION IN THE NATIONAL FOREST OF SÃO FRANCISCO DE PAULA, RS
Populations and species are disappearing due to disturbances in the environment caused by human activities. Given the obvious risk of loss of diversity, it is increasingly necessary to take actions concerning preservation, in which safety features are necessary for measuring the variation of diversity in space and time. The aim of this study was to evaluate
Publicado em: 2010
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16. Padrões florísticos e estruturais das Florestas Estacionais Semideciduais do Triângulo Mineiro, MG / Floristic and structural patterns of semideciduous seasonal forests of Triângulo Mineiro, MG
The semideciduous seasonal forests (SSF) of southeastern Brazil have a high floristic diversity, accompanied by a high beta diversity, even between nearby fragments. However, nowdays these forests have been represented by a large number of small fragments, a landscape pattern typical for this region. In addition to the processes related to fragmentation, the
Publicado em: 2010
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17. NONLINEAR DYNAMICS, INSTABILITY AND CONTROL OF STRUCTURAL SYSTEMS WITH MODAL INTERACTION / DINÂMICA NÃO-LINEAR, INSTABILIDADE E CONTROLE DE SISTEMAS ESTRUTURAIS COM INTERAÇÃO MODAL
The aim of this thesis is to study the influence of coupled buckling modes on the static and particularly on the nonlinear dynamic behavior of structural components liable to buckling. For this, two discrete two degrees of freedom models known for their complex nonlinear behavior are selected: the well-known Augusti¿s model and a simplified model of cable-s
Publicado em: 2010
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18. UtilizaÃÃo de Materiais Alternativos para a ConstruÃÃo de Pavimentos Urbanos na RegiÃo Metropolitana de Fortaleza / THE USE OF ALTERNATIVE MATERIALS FOR THE CONSTRUCTION OF URBAN PAVEMENTS ON FORTALEZA METROPOLITAN REGION
The shortage of natural raw materials in large urban centers encourages the study of alternative materials. With regard to the generation of waste from construction and demolition waste (CDW) the problem goes beyond the economic barriers and their irregular arrangement results in disturbances to the population in many different ways: proliferation of vectors
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2009
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19. Levantamento ambiental e pesqueiro dos rios Jaboatão e Pirapama no Estado de Pernambuco, Brasil
The increasing human populations that live on, work with and use resources of coastal areas place pressure on these resources, which, together with pressure from natural sources, must be monitored and understood in order to ensure the preservation of the environment and maintenance of quality of life. The rivers that empty along the coast of the state of Per
Publicado em: 2009
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20. Efeito do manejo de fogo sobre comunidades de aves em campos sujos no Parque Nacional das Emas, GO/MS, Cerrado Central / Effects of fire management on birds in Emas National Park, Brazil, Central Cerrado
Several studies have investigated the effects of natural fires on Cerrado birds. However, avian responses to fire management have not been examined. We compared birds found in firebreaks (fire managed areas) and in fire unmanaged grasslands, in Parque Nacional das Emas, Central Brazil. This is the first study to evaluate the effects of prescribed fire on the
Publicado em: 2009
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21. VOLTAGE STABILITY PROBABILISTIC ASSESSMENT IN COMPOSITE GENERATION AND TRANSMISSION SYSTEMS / ANÁLISE PROBABILÍSTICA DA ESTABILIDADE DE TENSÃO EM SISTEMAS COMPOSTOS DE GERAÇÃO E TRANSMISSÃO
In some countries, the electric power systems are operating near to their limits due to the absence of investments in the transmission network expansion and natural growth of the electricity demand. This operation condition can also occur in electric power systems in which the transmission expansion is carried out in appropriate way. In this case, the excess
Publicado em: 2009
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22. Estudo geoquímico da bacia do ama e avaliação da qualidade de água
The quality of water in a drainage basin reflects the natural processes of a water catchment and the changes of environmental conditions reflect on physical and chemical water chemistry. The present work was realized in two drainages on Gama Catchment, Gama brook and Cedro stream, whose waters discharge into Paranoá Lake (Brasília, Federal District). The a
Publicado em: 2008
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23. ICTIOFAUNA, CONSERVAÇÃO E INTERFERÊNCIAS ANTROPOGÊNICAS EM RIACHOS DO ALTO DA BACIA DO RIO PARANÁ EM GOIÁS, REGIÃO CENTROOESTE
This study was conducted in the basin of the João Leite River, which integrates the high Paraná River basin in the southwest of the Goiás State. This river has origin in the Ouro Verde county and it empties in the Meia Ponte River, its basin shelter about 1.600.000 inhabitants distributed in seven counties. The weather is classified as hot and sub-humid w
Publicado em: 2008
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24. Diversidade de Scarabaeinae (ColeÃptera: Scarabaeidae) na Caatinga do Parque Nacional do Catimbau, BuÃque - PE
This study aimed to ascertain the Scarabaeinae fauna from Parque Nacional do Catimbau, BuÃque - PE, and assess the response of their communities, in open and closed environments, to the variation pluviometric. The Scarabaeinae (Coleoptera: Scarabaeidae) are considered useful as biological indicators and have been used to investigate the effects of disturban
Publicado em: 2008