Permeability Variation
Mostrando 1-12 de 82 artigos, teses e dissertações.
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1. Testa structure in Erythrina speciosa (Leguminosae): the role of the mucilaginous stratum in the acquisition of physical dormancy
ABSTRACT Seeds of Erythrina speciosa (Papilionoideae) exhibit physical dormancy, but evidence has suggested that the proportion of impermeable seeds increases with storage. There are no records of structural variation in the testa of E. speciosa that justifies the difference in the percentage of seeds with physical dormancy. Therefore, the present study inve
Acta Bot. Bras.. Publicado em: 2020-09
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2. 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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3. Physical and geometric non-linear analysis using the finite difference method for one-dimensional consolidation problem
Abstract This article presents a numerical model based on the finite difference method for the physical and geometric non-linear analysis of a one-dimensional consolidation problem regarding a saturated, homogeneous and isotropic soil layer with low permeability and high compressibility. The problem is formulated by adopting the void ratio as the primary var
REM, Int. Eng. J.. Publicado em: 2019-06
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4. Coupled numerical simulation of a tailings deposit by FEM
Abstract Researchers have found that a valuable alternative for predicting the mechanical behavior of landfill construction is numerical simulation based on the finite element method. The results of such a numerical simulation for a sandy tailings deposit from the iron mining coupling flow and deformation are presented herein. This study investigates the inf
REM, Int. Eng. J.. Publicado em: 2019-03
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5. Genesis and Classification of Sodic Soils in the Northern Pantanal
ABSTRACT The simultaneous occurrence of high levels of exchangeable sodium percentage (ESP) and alkalinity in soils imposes restrictions on plant development and affects physical properties such as porosity, bulk density, permeability, and hydraulic conductivity. Although sodic soils are frequent in the flood plain of the São Lourenço River, northern Panta
Rev. Bras. Ciênc. Solo. Publicado em: 02/10/2017
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6. Comparative Study of Magnetic Properties and Microstructure for As-cast and Square-wave Pulse Current Joule Annealed Wires
We here report on a comparative study of the microstructure and magnetic properties of as-cast and SPCJA-ed Co-based wires for potential sensor applications. Experimental results indicate that both as-cast and SPCJA-ed wires exhibit typical amorphous feature. There also exists the enhanced local ordering degree of atomic arrangement and obvious transformatio
Mat. Res.. Publicado em: 23/10/2015
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7. Complex permeability and permittivity variation of radar absorbing materials based on MnZn ferrite in microwave frequencies
The complex dielectric permittivity (ε) and magnetic permeability (µ) of Radar Absorbing Materials (RAM) based on magnetic particles (MnZn ferrite particles) embedded in a dielectric matrix (silicon rubber) have been studied in the frequency range of 2 to 18 GHz. The relative permeability and permittivity of MnZn ferrite-silicon composites for various mass
Mat. Res.. Publicado em: 21/05/2013
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8. Blendas e filmes de quitosana/amido de milho: estudo da influência da adição de polióis, oxidação do amido e razão amilose/amilopectina nas suas propriedades / Chitosan/corn starch blends and films. Influence of polyol addition, starch oxidation and amylose/amylopectin ratio in their properties
Chitosan/starch association represents an interesting alternative to the preparation of biocompatible drug delivery systems, packing materials and edible films. Changes in rheological, thermal and mechanical properties, water vapor permeability and solubility of chitosan/starch films were evaluated varying the starch structure form (gelatinized or oxidized),
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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9. Influência do pH e da irradiação em filmes biodegradáveis de proteínas do soro de leite / Influence of ph and irradiation in whey proteins biodegradable films
The packaging has as main function to maintain the integrity of the product, protecting it against mechanical damage, moisture loss and gain. Most packaging is manufactured from non-biodegradable materials and non-renewable source promoting great environmental impacts. Among the raw materials used in the development of biodegradable films found the whey prot
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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10. Caracterização de resíduos sólidos da construção civil para sua utilização em camadas drenantes de aterros sanitários / Characterization of construction waste for use as drainage materials in sanitary landfills
Intense population growth brings with it environmental concerns, since exploitation of natural resources, makes it essential to adopt recycling policies in order to achieve sustainable development. Therefore, this study sought to define a new application for recylcling construction and demolition waste (CDW-R). Two size distributions that could be readily pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2011
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11. Escoamento de fluidos complexos e transporte de partÃculas em geometrias irregulares. / Complex fluid flows and particle transport in irregular geometries.
In this work many types of incompressible laminar Newtonian and Non-Newtonian flows are studied. The interplay of these flows with complex geometries was investigated using computational modeling and numerical solution of the conservation of momentum and mass continuity equations. As a first step, the computational modeling of a network of pores was adopted
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/04/2011
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12. Remediation of soils contaminated by diesel fuel using a system of washing with microemulsion / Remediação de solos contaminados com óleo diesel utilizando um sistema de lavagem com microemulsão
The underground reservoirs of fuel retailing system represent an environmental threat, because once in bad conservation, these tanks allow fuel leakage and infiltration. For soil contaminated with fuel, such as diesel oil, the present study introduces the microemulsion systems used by the method of washing. In tests carried out in column with a sample of san
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011