Sands
Mostrando 1-12 de 131 artigos, teses e dissertações.
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1. Proposal of a failure envelope for artificially cemented sand
Abstract Soils are particulate materials, which often stand out for their low shear strength. In most cases, this aspect justifies adapting the geotechnical project for this characteristic, which can be even more problematic in the case of soft sands, since it often occurs in superficial layers in various parts of the metropolitan region of Fortaleza. Theref
REM - International Engineering Journal. Publicado em: 2022
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2. Clinical complications in children with false-negative results in cystic fibrosis newborn screening
Abstract Objective: To present signs and symptoms and clinical course in cystic fibrosis patients with false-negative newborn screening (CF NBS). Materials and methods: All children presented in this paper were covered by CF NBS. The group of 1.869.246 newborns was screened in the Institute of Mother and Child in Warsaw within a period of 01.01.1999 – 31
Jornal de Pediatria. Publicado em: 2022
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3. Influence of the physical characteristics of sand and the crushed filler content on the properties of self-leveling mortars
Abstract The properties of self-leveling mortars (SLMs) in the fresh and hardened state are strongly affected by their formulation. In this study, the influence of three different quartz sands (different physical characteristics) was investigated in SLMs, as well as the replacement of these sands by crushed basalt filler. The tests performed were: spreading,
Cerâmica. Publicado em: 2021-06
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4. A social license to operate: pre-mining effects and activities perspective
Abstract This research proposes a new approach to recommend a responsible mining guideline on how to secure a social license to operate in Ondo state, Nigeria for oil sands mineral resources taking into account the bituminous natural effects. This is the case of bituminous oil sands in Southern Nigeria, where warm weather can induce the emission of natural b
REM, Int. Eng. J.. Publicado em: 19/06/2019
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5. Experimental bedforms by saline density currents
Abstract Bedforms are sedimentary features that can be generated on the seafloor by the interaction between density currents and mobile beds. Developing knowledge about the hydraulic and sedimentary processes involved during these events is in the interest of research groups and oil companies. Because of the magnitude of the density currents in its natural e
Braz. J. Geol.. Publicado em: 20/05/2019
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6. Using Polymer Reaction Engineering Principles to Help the Environment: The Case of the Canadian Oil Sands Tailings
The Canadian oil sands reserves are an important national resource with a large impact on the Canadian economy. Unfortunately, oil sands extraction processes generate toxic by-products called mature fine tailings that need to be stored in disposal ponds for a very long time before the land can be reclaimed. This serious environmental liability needs to be ad
J. Braz. Chem. Soc.. Publicado em: 2019-03
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7. Enhanced settling of mature fine tailings (MFT) by paramagnetic nanofluids based on nanoiron
ABSTRACT The extraction of bitumen from sand by utilizing hot water processes results in the production of a slurry waste which is stored in so called “tailings ponds”. Within these ponds, while fast settling sand particles segregate from the slurry in relatively short time, the fines fraction accumulates in the center of the pond and then settles, becom
Matéria (Rio J.). Publicado em: 19/07/2018
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8. A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Araguaia basin, Brazil, with comments about Corydoras araguaiaensis Sands, 1990
RESUMO Uma espécie nova de Corydoras é descrita da bacia do rio Araguaia, Goiás, Brasil. A espécie nova pode ser distinguida de suas congêneres por apresentar as seguintes características: infraorbital 1 com expansão laminar ventral muito grande; infraorbital 2 em contato com o pterótico composto; flancos densamente cobertos por manchas pretas irregu
Neotrop. ichthyol.. Publicado em: 15/03/2016
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9. Free Opening Performance of Steel Ladle as a Function of Filler Sand Properties
The secondary steel refining process uses filler sand as a thermal insulating barrier that separates the liquid metal from direct contact with slide-gate system of the steel ladle. The effective use of this practice must provide a high free opening rate, impacting on increased productivity and quality of steel, reducing the number of stops, thermal loss and
Mat. Res.. Publicado em: 12/02/2016
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10. On the crack propagation analysis of rock like Brazilian disc specimens containing cracks under compressive line loading
The pre-existing cracks in the brittle substances seem to be the main cause of their failure under various loading conditions. In this study, a simultaneous analytical, experimental and numerical analysis of crack propagation, cracks coalescence and failure process of brittle materials has been performed. Brazilian disc tests are being carried out to evaluat
Lat. Am. j. solids struct.. Publicado em: 2014-12
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11. An overview of heavy oil properties and its recovery and transportation methods
Unconventional oils - mainly heavy oils, extra heavy oils and bitumens - represent a significant share of the total oil world reserves. Oil companies have expressed interest in unconventional oil as alternative resources for the energy supply. These resources are composed usually of viscous oils and, for this reason, their use requires additional efforts to
Braz. J. Chem. Eng.. Publicado em: 2014-09
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12. Terpanos pentacíclicos como indicadores de heterogeneidades composicionais em reservatório de petróleo biodegradado
Reservoir geochemistry has been effectively used to evaluate compositional heterogeneity in petroleum reservoirs by employing oil fingerprinting technique to assess reservoir continuity, primarily in paraffin oil accumulations. In-reservoir biodegradation has resulted in vast deposits of heavy oils globally; therefore, the application of reservoir geochemist
Quím. Nova. Publicado em: 2014