Mixed Columns
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Leaching and Persistence of Sulfentrazone when Mixed with Adjuvants
RESUMO: Objetivou-se neste trabalho estudar a influência de adjuvantes na lixiviação e na persistência do sulfentrazone em um Argissolo Vermelho-Amarelo. O solo foi acondicionado em colunas de PVC de 10 cm de diâmetro por 50 cm de comprimento. Os tratamentos foram compostos pela combinação do herbicida sulfentrazone misturado a seis adjuvantes (Adesil
Planta daninha. Publicado em: 30/09/2019
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2. Boron Leaching Decreases withIncreases on Soil pH
ABSTRACT Management of boron fertilization depends on the magnitude of B leaching in the soil profile, which varies proportionally with the concentration of B in the soil solution, which, in turn, decreases as the soil pH increases due to the higher sorption of B on soil solid surfaces. The objective of this study was to quantify the effect of liming and rat
Rev. Bras. Ciênc. Solo. Publicado em: 26/04/2016
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3. Optimization of an Electrolyte System for the Simultaneous Separation of Nelfinavir Mesylate and Two Impurities by Micellar Electrokinetic Chromatography
A methodology for the simultaneous determination of nelfinavir mesylate and the impurities 3-hydroxy-2-methylbenzoic acid and (2R,3R)-4-((3S,4aS,8aS)-3-(tert-butylcarbamoyl) octahydroisoquinolin-2(1H)-yl)-3-hydroxy-1-(phenylthio)butan-2-aminium benzoate by micellar electrokinetic chromatography, with an analysis time of 25 min, was proposed. An electrolyte c
J. Braz. Chem. Soc.. Publicado em: 2015-05
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4. Simulation of ethanol extractive distillation with mixed glycols as separating agent
Extractive distillation is an alternative for ethanol dehydration processes that has been shown to be more effective than azeotropic distillation and, in close proximity, to be very competitive against the process that uses adsorption with molecular sieves. Glycols have been shown to be the most effective solvents in extractive distillation, mainly ethylene
Braz. J. Chem. Eng.. Publicado em: 2014-03
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5. Colunas mistas esbeltas de aço preenchidas com concreto de alta resistencia em temperatura ambiente e em situação de incendio / Mixed slender steel columns filled with high strenght concrete in room temperature and fire situation
In this work, it was investigated in laboratory the effect of fire in slender steel columns unfilled and filled with high strength concrete submitted to three different levels of axial load (30%, 50% and 70%), which is the relation between the axial load to be applied in fire situation and the ultimate load obtained in the column test to room temperature. So
Publicado em: 2009
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6. Slender concrete filled steel columns with square section in fire condition / Pilares mistos esbeltos em aço preenchidos com concreto, de seção quadrada, em situação de incendio
O desenvolvimento técnico e científico fez surgir sistemas estruturais mistos, entre eles os pilares mistos preenchidos, com grande aplicação em edifícios altos. Como a estrutura mista tem um bom comportamento estrutural aliado a uma redução de custos com materiais, mão-de-obra e tempo de execução, ela tem tido um crescente avanço na utilização
Publicado em: 2009
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7. Slender concrete filled steel columns with diameter in fire condition / Colunas esbeltas de pequeno diametro mistas de aço preenchidas com concreto em situação de incendio
Neste trabalho será abordado o comportamento estrutural de colunas esbeltas de pequeno diâmetro mistas de aço preenchidas com concreto em situação de incêndio. As colunas mistas vêm sendo largamente utilizadas em edifícios altos, principalmente, em países europeus, americanos e asiáticos. No Brasil, seu uso, vem sendo difundido na engenharia nacion
Publicado em: 2008
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8. Impacts of vinasse application on soil and effluent chemical properties / Impactos da aplicação de vinhaça sobre as propriedades químicas do solo e de seu efluente
The objective of this study was to evaluate the impacts of vinasse on soil columns effluents besides quantify ionic species in soil layers as affected by vinasse application, and its downward movement along time. Soil samples were collected at two different areas: the first one is a sugarcane field cropped during 21 years; the second one, an untouched savann
Publicado em: 2007
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9. ELEMENTOS FINITOS ENRIQUECIDOS PARA FLAMBAGEM E VIBRAÇÃO DE PLACAS / ENRICHED FINITE ELEMENTS FOR BUCKLING AND VIBRATION OF SHELLS
The focus of the present work is to developand evaluate enriched elements used to obtain critical loads, frequencies of vibration and respective modes for two-dimensional structural components (rectangular plates in bending under inplane compressive loading). The Rayleigh-Ritz approximation method has been employed, directed to the use of conventional finite
Publicado em: 2007
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10. Utilização do estéril da extração do gesso, como condicionador das propriedades físicas de um neossolo quartzarênico do semi-árido pernambucano
The effects of the addition of the sterile material resulting from the gypsite mining as a soil conditioner were studied. The sterile was incorporated into a Neossolo Quartzarênico collected in the county of Petrolina, PE. Initially the sterile was separated into six granulometric intervals through sieving in the following grades: <1mm, <2mm, <4mm, between
Publicado em: 2007
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11. Potencial biotecnolÃgico de Candida lipolytica na produÃÃo de biossurfactantes, nos processos de remoÃÃo e biossorÃÃo do pireno (derivado do petrÃleo)
In previous studies Candida lipolytica IA1055 has shown excellent potential in biosurfactant production, demonstrating emulsifying ability in low-cost culture media. Taking that into consideration, investigations were performed utilizing low-cost culture media in basal seawater supplemented with babassu oil and glucose as control of carbon sources. The highe
Publicado em: 2004
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12. Three-dimensional analyses of a mixed bracing system used in tal buildings / AnÃlise tridimensional de um sistema de contraventamento misto aplicado em edifÃcios altos / Three-dimensional analyses of a mixed bracing system used in tal buildings / AnÃlise tridimensional de um sistema de contraventamento misto aplicado em edifÃcios altos
The objective of this work is to analyze a mixed bracing system formed by passing trusses (outriggers) rigidly connected to stiff columns. It was performed three-dimensional analyses in a fifty storey building with high strength steel columns made with high resistence steel (AR-345) in periphery and reinforced concrete stiff columns in the core. A diaphragm
Publicado em: 2003