Perlite
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Effects of different levels of expanded perlite on the performance and egg quality traits of laying hens
ABSTRACT The influence of different levels of expanded perlite on the performance and egg quality traits was studied in laying hens. Forty Lohmann Brown females at 30 weeks of age were randomly assigned to four groups consisting of five replicates with two hens in each. Four diet groups were supplemented with 0% (control group), 1%, 2%, and 3% perlite, respe
R. Bras. Zootec.. Publicado em: 2017-01
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2. Residual Stress, Microstructure and Hardness of Thin-Walled Low-Carbon Steel Pipes Welded Manually
The aim of this work is to evaluate the welding residual stress profile in ASTM A106 Gr. B steel pipes with 4" diameter and to correlate this profile with the microstructure and hardness of the joint. The results showed that the residual stresses are more uniform for a lower welding heat input. Higher welding heat input causes not only a non-uniformity of th
Mat. Res.. Publicado em: 29/09/2016
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3. Symbiotic potential and survival of native rhizobia kept on different carriers
Native rhizobia are ideal for use as commercial legume inoculants. The characteristics of the carrier used to store the inoculants are important for the survival and symbiotic potential of the rhizobia. The objective of this study was to investigate the effects of peat (PEAT), perlite sugarcane bagasse (PSB), carboxymethyl cellulose plus starch (CMCS), an
Braz. J. Microbiol.. Publicado em: 2015-09
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4. Estudo termoanalítico da perlita hidrofobizada com óleo de linhaça
Nesse trabalho a perlita expandida, um argilomineral, constituído de SiO2 e Al2O3 nas proporções de 72,1 e 18,5%, respectivamente foi utilizada como adsorvente para petróleo na sua forma pura expandida como também hidrofobizada com óleo de linhaça. Para isso, utilizou-se a Termogravimetria (TG), a Termogravimetria Derivada (DTG) e a Análise Térmica
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/01/2010
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5. Substratos de crescimento e produção de mudas de figo
O ataque de pragas e de doenças e o esgotamento do solo sempre foram grandes problemas na produçào de mudas de figo (Ficus carica L) em estufa, especialmente quando são empregados métodos tradicionais que usam solo como substrato. Por isso o uso de substratos sem solo poderia ser alternativa favorável para obtenção de mudas saudáveis de alta qualida
Scientia Agricola. Publicado em: 2010-12
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6. Removal of cadmium and nickel from aqueous solution using expanded perlite
The adsorption characteristics of cadmium and nickel onto expanded perlite from aqueous solution have been investigated with respect to changes in pH of solution, adsorbent dosage, contact time and temperature of the solution. The maximum removal efficiency of Cd (II) is 88.8% at pH 6 and exposure to 10 g/L expanded perlite, while for Ni (II), it is 93.3% at
Brazilian Journal of Chemical Engineering. Publicado em: 2010-06
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7. Enraizamento de estacas de duas cultivares de oliveira submetidas à aplicação de diferentes fertilizantes
Estacas semilenhosas com aproximadamente 12 cm de comprimento e quatro folhas coletadas na região mediana da copa em plantas de oliveira das cultivares Ascolano 315 e Arbequina, foram preparadas, e em seguida tratadas com 3000 mg L-1 de AIB por cinco segundos. O ensaio foi realizado em estufa, com sistema de nebulização intermitente, sendo as estacas colo
Bragantia. Publicado em: 2010
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8. Estudo da transformação durante o resfriamento continuo e da microestrutura do aço microligado X80 utilizado na construção de tubos para transporte de gás natural e petróleo. / Study of the transformation during the continuous cooling and the microstructure of microalloyed steel X80 used in the building of pipelines for gas and oil transport.
The continuous increase of energy generated from petroleum and natural gas created the need to improve the mechanical properties of microalloyed steels used in gas and oil pipelines, in order to increase their flow with smaller costs and higher reliability. The control of the different phases, morphology of microconstituents like ferrite plus carbide aggrega
Publicado em: 2008
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9. Impact of biocatalyst and moisture content on toluene/xylene mixture biofiltration
The objective of this work was to determine the influence of microbial inoculation on degradation efficiency. Three biofilters were used for the treatment of waste gas. A mixture of compost and perlite (8:2) served as the packing material. One biofilter was inoculated with a constructed microbial population. The second remained uninoculated, having the natur
Brazilian Archives of Biology and Technology. Publicado em: 2006-11
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10. Impact of biocatalyst and moisture content on toluene/xylene mixture biofiltration
O objetivo deste trabalho foi determinar a influência da inoculação microbiana na eficiência da degradação. Três biofiltros foram utilizados no tratamento do gás residuais. Uma mistura de composto e perlite na proporção (8:2) serviu como o material de empacotamento dos biofiltros. Um biofiltro foi inoculado com uma população microbial selecionada
Brazilian Archives of Biology and Technology. Publicado em: 2006-03
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11. Estudo do processo de laminação transversal com cunha (cross wedge rolling) para fabricação de eixos escalonados
ln this work tests were held with the Cross Wedge Rolling (CWR) process to analyze the influence of the process temperature, process speed and properties of the workpiece materiaJson the stability of the process. To perform these tests it was necessary to design and assemble a laboratory CWR equipment flexible enough to manufacture shafts with large ranges o
Publicado em: 2004
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12. Toughness of two HSLA steel sheets
This paper presents a study concerning the toughness anisotropic behavior of two high-strength low-alloy steel sheets having ferrite-martensite (dual-phase) and ferrite-perlite grain-refined structures. The anisotropic behavior quantification was possible through tension and Charpy impact tests. It has been concluded that mechanical resistance has higher val
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-04