952 resultados para Philipp, prince of Saxe-Coburg-Gotha, 1844-
Resumo:
In developed countries, civil infrastructures are one of the most significant investments of governments, corporations, and individuals. Among these, transportation infrastructures, including highways, bridges, airports, and ports, are of huge importance, both economical and social. Most developed countries have built a fairly complete network of highways to fit their needs. As a result, the required investment in building new highways has diminished during the last decade, and should be further reduced in the following years. On the other hand, significant structural deteriorations have been detected in transportation networks, and a huge investment is necessary to keep these infrastructures safe and serviceable. Due to the significant importance of bridges in the serviceability of highway networks, maintenance of these structures plays a major role. In this paper, recent progress in probabilistic maintenance and optimization strategies for deteriorating civil infrastructures with emphasis on bridges is summarized. A novel model including interaction between structural safety analysis,through the safety index, and visual inspections and non destructive tests, through the condition index, is presented. Single objective optimization techniques leading to maintenance strategies associated with minimum expected cumulative cost and acceptable levels of condition and safety are presented. Furthermore, multi-objective optimization is used to simultaneously consider several performance indicators such as safety, condition, and cumulative cost. Realistic examples of the application of some of these techniques and strategies are also presented.
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This paper records for the first time the presence of Corbicula fluminea (Philipi, 1844) in the Brazilian Amazon Basin. This exotic bivalve was found in localities on the Amazonas, Pará and Tocantins rivers. Density and population size structure were measured in some localities. Mean density is between 6.66 and 7.3 individuals m-2. Population size structure and the dates of the first records suggest that the introductions may have occurred between 1997 and 1998. The introductions may have been mediated by ocean-going vessels visiting the ports of Manaus and Belém. The potential impact of the invasion on native freshwater bivalves is discussed along with the need for monitoring and prevention of further introductions of non-indigenous bivalves in Brazil.
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fasc.27 (1904)
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fasc.47 [Mollusques Euptéropodes] (1915)
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fasc.28 [Méduses] (1904)
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fasc.27 [Siphonophores] (1904)
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fasc.44 [Exploration pt.5] (1913-1914)
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fasc.34 [Échinodermes] (1909)
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fasc.45 [Spongiaires II] (1913)
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fasc.46 [Annélides Polychètes] (1914)
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fasc.24 [Arsenic] (1903)
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fasc.13 [Crustacés Décapodes II] (1899)
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fasc.15 [Géphyriens I] (1900)
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fasc.22 [Echantillons D'eaux & de Fonds) (1902)
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fasc.30 [Antipathaires & Cérianthaires] (1905)
