Ballast
Mostrando 1-12 de 58 artigos, teses e dissertações.
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1. Study of soils used with subgrade and sub-ballast in Brazilian railways
Abstract Brazil has an extremely limited railroad network compared to other developed and developing countries. There are projects to expand this mesh. Knowing that the cost of implementing a railroad is high, research for solutions that allow cost reduction is of great importance. But the parameters of the materials used in the subgrade and sub-ballast laye
REM - International Engineering Journal. Publicado em: 2022
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2. CORRELATION OF SOIL PHYSICAL ATTRIBUTES WITH FURROWING SHANK STRENGTH AND DEPTH IN A NO-TILL SEEDER
ABSTRACT Furrowing shank horizontal strength and working depth can be correlated with soil compaction in a no-till sowing. This study aimed to evaluate the correlation of furrowing shank strength and working depth with soil physical properties at two working speeds (1.58 and 1.87 m s-1) and four compaction levels induced by an agricultural tractor (0P, 1P, 3
Engenharia Agrícola. Publicado em: 2022
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3. Use of dynamic ballast testing equipment for analysis of rail aggregate breakdown
Abstract The granulometric range used has a direct influence on the life of the ballast layer when subjected to the load generated by rail traffic. However, in Brazil, we have only two size ranges to be used. The publications related to the subject matter under study express the need for a continuous grain size strip, different from the ones usually used in
REM, Int. Eng. J.. Publicado em: 2021-06
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4. Analysis of carbonation and hydration of BOF steel slag for application as railway ballast
Abstract The reutilization of waste is a valuable alternative for the preservation of natural resources and the environment. In this sense, Basic Oxygen Furnace (BOF) steel slag is one of the most residues generated in steel the industry. It is estimated that for each ton of steel produced, about 150 kg of steel slag is generated in the BOF process. Generall
REM, Int. Eng. J.. Publicado em: 2020-12
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5. Method to assess the atmospheric pollutant emissions generated by railway track maintenance
Abstract Paper aims Propose a method to calculate and evaluate the pollutants emissions generated by the track maintenance process considering the life cycle of the three components: ballast, sleepers and rail. Originality After the literature review, we did not find any published research that quantifies, in an integrated way, the atmospheric pollutants e
Prod.. Publicado em: 13/12/2019
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6. Nassarius foveolatus (Gastropoda, Nassariidae), a new record of an exotic species in Brazil
Abstract Exotic species are those that occur in an area beyond their natural limit and they are considered invasive when they cause harm to the economy, environment, or human health. In coastal environments, ballast water and inlays on the hull and other parts of vessels are the main ways of introducing invasive aquatic alien species. Nassarius foveolatus (D
Pap. Avulsos Zool.. Publicado em: 28/11/2019
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7. Use of osmoregulatory ability to predict invasiveness of the Indo-Pacific swimming crab Charybdis hellerii (A. Milne-Edwards, 1867) an invader in Southern Brazil
Abstract The Indo-Pacific swimming crab Charybdis hellerii (A. Milne-Edwards, 1867) is native to the Indo-Pacific Ocean, and occurs as an invasive species along the Eastern American coast, where it was probably introduced in ballast water. The present study evaluated the osmoregulation and salinity tolerance of C. hellerii in Paranaguá Bay, Paraná, Brazil,
Nauplius. Publicado em: 07/11/2019
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8. O ESCRAVO VAI À ÓPERA: ÓPERA E ESCRAVIDÃO NO RIO DE JANEIRO AO REDOR DE 1850
Resumo Se, por um lado, foi a riqueza produzida pela mão de obra escrava que financiou a importação da ópera europeia para o Brasil, por outro, a proibição do tráfico negreiro foi instrumental para a instalação definitiva de um sistema de ópera no império tropical, uma vez que, como nota Luiz Felipe de Alencastro, um dos efeitos da Lei Eusébio de
Sociol. Antropol.. Publicado em: 19/08/2019
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9. Chemical and mineralogical characterization of silicon manganese iron slag as railway ballast
Abstract In nature, metal ores such as iron, lead, aluminum and others are found in an impure state, sometimes oxidized and mixed with silicates of other metals. During casting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed. The mass formed by these compounds is slag. Slag is the co-prod
REM, Int. Eng. J.. Publicado em: 2017-12
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10. Three-Dimensional Rail-Bridge Coupling Element of Unequal Lengths for Analyzing Train-Track-Bridge Interaction System
Abstract A three-dimensional rail-bridge coupling element of unequal lengths in which the length of the rail element is shorter than that of the bridge element is presented in this paper to investigate the spatial dynamic responses of a train-track-bridge interaction system. Formulation of stiffness and damping matrices for the fastener, ballast, and bearing
Lat. Am. j. solids struct.. Publicado em: 2016-12
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11. Enterobacteria identification and detection of diarrheagenic Escherichia coli in a Port Complex
The Port Complex of Maranhão (PCM) is the second largest port complex in Brazil, receiving ships with large volumes of ballast water. To evaluate the microbiological quality of its waters, physicochemical parameters (pH and salinity), the number of coliforms (thermotolerants and totals), and the presence of enterobacterias and diarrheagenic Escherichia coli
Braz. J. Microbiol.. Publicado em: 2014-09
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12. Orçamento participativo: os limites da inovação institucional em Cuiabá-MT / Participative budget: the limits of institutional innovation in Cuiabá-MT/Brazil
The democratization process in Brazil in recent decades resulted from the combination of different forms of collective mobilization and changes in the state apparatus. The end of authoritarianism and democracy openness produced new sociopolitical arrangements of popular participation and enhancement of citizenship, through of creation of inclusive mechanisms
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2012