Plastic Viscosity
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. Study on Preparation and Performance of High Swelling Bentonite
ABSTRACT For improving the expansibility of natural Ca-based bentonite (Ca-Bent), the Ca-Bent was modified with sodium dodecyl benzene sulfonate(SDBS)-Na2CO3 complex agent by microwave semi-dry method. And the ratio of Na2CO3 to SDBS, microwave power, radiation time and initial temperature on the modification were studied. Furthermore, X-ray diffraction (XRD
Matéria (Rio J.). Publicado em: 18/10/2018
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2. AVALIAÇÃO DE CARACTERÍSTICAS DE BIODIESEIS DE FONTES ALTERNATIVAS SUBMETIDOS A CONDIÇÕES DE ARMAZENAGEM DIFERENCIADA
Biodiesel is an alternative fuel obtained from different biomass sources and processes. Nowadays, this biofuel has gained importance due to environmental concerns and rising energy demand. In the biodiesel production chain, stability is a critical issue, as it is linked to the maintenance of its original properties. This work performed a study evaluating the
Quím. Nova. Publicado em: 2018-06
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3. Study of Glass Forming on Cu60.0Zr32.5Ti7.5 Alloy by Molecular Dynamics Simulation
This paper presents the results of Molecular Dynamics (MD) simulations of Cu60.0Zr32.5Ti7.5 alloy through the open source code LAMMPS. Amorphous samples were produced by quenching the molten metal from 2300 to 300 K. The pair distribution functions of the liquid and solid were calculated. Moreover, the atomic short-range order at 800, 700 and 300 K was obtai
Mat. Res.. Publicado em: 21/12/2017
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4. Processing and Properties of PCL/Cotton Linter Compounds
Biodegradable compounds of poly(ε-caprolactone) (PCL)/ cotton linter were melting mixed with filling content ranging from 1% to 5% w/w. Cotton linter is an important byproduct of textile industry; in this work it was used in raw state and after acid hydrolysis. According to the results of torque rheometry no decaying of viscosity took place during compoundi
Mat. Res.. Publicado em: 19/01/2017
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5. Modelo para determinação da perda de carga contínua em tubos elásticos / Model for determining the continuous head losses in elastic pipe
Total head losses are accounted in the irrigation hydraulic projects, that would be the continuous losses and the local head losses, aiming to maximize the uniformity of water distribution, characterizing an adequate pump set to the irrigation system e thus, minimizing the project implantation and annual costs. With informatics support, complex calculation p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2011
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6. Determination of rheological properties of fresh concrete and similar materials in a vibration rheometer
A vibration rheometer has been developed for the purpose of determining the viscosity coefficient and the yield value of fresh concrete under vibration. The main parts of the apparatus, a test specimen and a vibration source form a unitary oscillatory system whose parameters can be measured with sufficient precision. Two types of fine grained reference mater
Materials Research. Publicado em: 22/12/2011
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7. Mix design of high-performance concrete
A mix design procedure for high-performance concrete mixes has been presented in this paper. Since rheological parameters and compressive strength are fundamental properties of concrete in two different stages of production, the correlation between rheological parameters and compressive strength has been used instead of using water-cement ratio versus compre
Materials Research. Publicado em: 21/11/2011
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8. OBTENÇÃO E CARACTERIZAÇÃO DE EMULSÃO PARA CORREÇÃO DE ESCOAMENTO DE ÓLEO PESADO. / OBTAINING AND CHARACTERIZATION OF EMULSION FOR CORRECTION OF HEAVY OIL FLOW.
Extracting and producing heavy oil presents many difficulties, promoted by the nature of the constant quantities involved, such as viscosity of the oil, the means through where it moves the salinity of water, oil composition, the temperature and so forth. In the pumping, the amount of oil which is drawn is not enough to meet the expenses, that is, the cost-e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2010
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9. Correlating slump, slump flow, vebe and flow tests to rheological parameters of high-performance concrete
Conventional single-point workability tests continue to be used for specification and quality control of concrete despite their inherent limitations. These tests cannot characterize workability of concrete in terms of fundamental rheological parameters. Attempt has therefore been made to correlate slump, slump flow, slump flow time, percent flow and Vebe tim
Materials Research. Publicado em: 2009-03
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10. Chemical and physical characterization of cassava flour and soy protein biofilms. / Caracterização físico-química de filmes biodegradáveis de farinha de mandioca e proteína de soja.
Environmental concerns associated with plastics disposal have promoted research into alternatives to replace the common plastic. Following this tendency, this research used cassava flour mixed with different rates of soybean protein and glycerol to produce biodegradable films by thermoplastic extrusion. Variables analyzed were: soybean protein, moisture and
Publicado em: 2009
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11. Biodegradação de polietileno tereftalato (PET) por fungos ligninoliticos / Biodegradation of polyethylene tereftalate by ligninolytic fungi
In 1977, polyethylene terephthalate (PET), a plastic derived from petroleum, started to be used as raw material for packaging material and engineering plastics. However, under an environmental point of view, the use of plastics is considered problematic because of their high durability and high volume when present in domestic and industrial solid wastes. Thi
Publicado em: 2009
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12. AnÃlise da utilizaÃÃo de gargalos e fios de garrada pet como enchimento de torres de resfriamento
In some industrial processes, as well as in air conditioning processes, there is the need for cooling of equipments that generate heat during his operation. Usually, the fluid utilized to dissipate that generated heat is the water, due to its physical characteristics (high heat capacity, low viscosity, high thermal conductivity and high density). Besides its
Publicado em: 2009