Fine Sand
Mostrando 13-24 de 117 artigos, teses e dissertações.
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13. Investigación de diseños de mezcla para producir Ultra High Performance Fiber Reinforced Concrete (UHPFRC) usando ANOVA
ABSTRACT An experimental study is presented to produce Ultra High Performance Fiber Reinforced Concrete (UHPFRC) including industrial waste in the mix, and determine the average compressive strength. The study includes factor arrangements to perform analysis of variance using ANOVA. The controllable factors were: (i) age of the sample; (ii) granulometry of t
Matéria (Rio J.). Publicado em: 10/06/2019
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14. Efeito da adição de resíduos da construção e demolição (RCD) nas propriedades hidromecânicas de um solo areno-argiloso
RESUMO Diante de uma produção cada vez mais evidente dos resíduos sólidos resultantes das ações humanas, tais como os Resíduos da Construção e Demolição (RCD), destinar adequadamente estes materiais tem ganho importância no cenário atual, pois quando dispostos irregularmente atuam de forma degradante sobre o meio ambiente e contribuem com a prol
Matéria (Rio J.). Publicado em: 10/06/2019
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15. Incorporação de lodo de estação de tratamento de água (ETA) como agregado miúdo em concretos: avaliação das propriedades físico-mecânicas
RESUMO O presente trabalho tem como objetivo principal investigar a potencialidade do emprego de lodo de estação de tratamento de água (ETA) moído e calcinado em substituição ao agregado miúdo em concretos de cimento Portland, assim evitando o descarte em aterros sanitários e se tornando uma possível alternativa de reutilização desse material. For
Matéria (Rio J.). Publicado em: 20/05/2019
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16. The Neostratotype of Itapecuru Formation (Lower-Middle Albian) and Its Impact for Mesozoic Stratigraphy of Parnaíba Basin
Abstract Abstract: This study defines the neostratotype of the Lower-Middle Albian Itapecuru Formation in the Parnaíba Basin, Northeast Brazil. In this sedimentary succession along the right bank of the Itapecuru River near the Itapecuru-Mirim City, Maranhão State, three lithofacies associations are recognized. The first is silty claystone with some very f
An. Acad. Bras. Ciênc.. Publicado em: 06/05/2019
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17. The use of tire rubber in the production of high-performance concrete
Abstract The advances in concrete technology lead to the search for alternative materials that provide improvements in concrete properties while at the same time collaborating with sustainable practices in construction. In this study, the influence of the incorporation of waste tire rubber on the mechanical properties of high-performance concrete was discuss
Cerâmica. Publicado em: 2019-01
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18. 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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19. Extensión de durabilidad de pistones de bombas de fractura hidráulica mediante el empleo de tecnología de nitruración por plasma y PVD
ABSTRACT Hydraulic stimulation technique consists of "fracturing" the formation (rock reservoirs) through pumping a fracturing fluid downhole. This operation is performed by using hydraulic fracturing pumps. The pistons of these pumps are mechanical components performing the intake and compressing fracture fluid by reciprocating action. During this alternati
Matéria (Rio J.). Publicado em: 19/07/2018
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20. PROTECTED ENVIRONMENTS AND SUBSTRATES FOR ACHACHAIRU SEEDLINGS
ABSTRACT The Achachairu (Garcinia humilis) is a Bolivian exotic fruit that has been produced and commercialized a few years in Brazil. Information about the production of high quality seedlings is essential for the implementation and the renewal of orchards. The objective was to evaluate protected environments and substrates for Achachairu seedlings. Two pro
Eng. Agríc.. Publicado em: 2018-06
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21. Hymenaea courbaril SEEDLINGS IN PROTECTED ENVIRONMENTS AND SUBSTRATES
ABSTRACT The Brazilian copal is a tree fruit species that can be used for various purposes. The study evaluated protected environments and substrates in forming Brazilian copal seedlings (Hymenaea courbaril), at the State University of Mato Grosso do Sul, Cassilândia-MS, from January to March, 2014. Two greenhouses were used: (A1) agricultural greenhouse co
Eng. Agríc.. Publicado em: 2017-02
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22. Cacao Crop Management Zones Determination Based on Soil Properties and Crop Yield
ABSTRACT: The use of management zones has ensured yield success for numerous agricultural crops. In spite of this potential, studies applying precision agricultural techniques to cacao plantations are scarce or almost nonexistent. The aim of the present study was to delineate management zones for cacao crop, create maps combining soil physical properties and
Rev. Bras. Ciênc. Solo. Publicado em: 19/12/2016
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23. Cordão Formation: loess deposits in the southern coastal plain of the state of Rio Grande do Sul, Brazil
ABSTRACT Loess consists of silt-dominated sediments that cover ~10% of the Earth's surface. In southern South America it occurs in Argentina, Bolivia, Paraguay and Uruguay, and its presence in southern Brazil was never studied in detail. Here is proposed a new lithostratigraphic unit, Cordão Formation, consisting of loess deposits in the southern Brazilian
An. Acad. Bras. Ciênc.. Publicado em: 2016-12
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24. PROTECTED ENVIRONMENTS AND SUBSTRATES FOR MANGABEIRA SEEDLINGS (Hancornia Speciosa Gomez) PRODUCTION
ABSTRACT Mangabeira is a native fruit tree from Brazil, which provides a delicious fruit to taste and beneficial to health, whose information about the seedlings production will assist the entire productive chain of this important species. The aim of this research was to evaluate protected environments and substrates compositions in the formation of mangabei
Eng. Agríc.. Publicado em: 2016-12