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The Influence of Pit and Fissure Sealants on Infrared Fluorescence Measurements
(Karger, 2008-01-01)
The aim of this in vitro study was to evaluate the influence of pit and fissure sealants on fluorescence readings using lasers. We selected 166 permanent molars and randomly divided them into 4 groups which were each treated ...
Influence of temperature on the dielectric and ferroelectric properties of bismuth titanate thin films obtained by the polymeric precursor method
(Elsevier B.V., 2005-08-15)
The (1 1 7) and (0 0 1 0)-oriented Bi4Ti3O12 thin films were fabricated on Pt/Ti/SiO2/Si substrates by using a polymeric precursor solution under appropriate crystallization conditions. Atomic force microscopy and scanning ...
Synthesis and characterization of cellulose acetate produced from recycled newspaper
(Elsevier B.V., 2008-07-04)
In this work, the viability of recycling newspaper for producing cellulose acetate was tested. Newspaper recycling is extremely important not only for the environment preservation, but also from the economical point of ...
Laminar forced convection to a pseudoplastic fluid food in circular and annular ducts
(Elsevier B.V., 2006-04-01)
In this manuscript we investigated experimentally the steady-state heat transfer to an important pseudoplastic fluid food, the soursop juice, flowing in laminar regime through circular and concentric annular ducts. The ...
Morphological, mechanical properties and biodegradability of biocomposite thermoplastic starch and polycaprolactone reinforced with sisal fibers
(Sage Publications Ltd, 2012-04-01)
The incorporation of fibers as reinforcements in polymer composites has increased due to their renewability, low cost and biodegradability. In this study, sisal fibers were added to a polymer matrix of thermoplastic starch ...
Characterization of glycerol kinase from baker's yeast: Response surface modeling of the enzymatic reaction
(Elsevier B.V., 2008-06-01)
The present study describes a methodology of dosage of glycerol kinase (GK) from baker's yeast. The standardization of the activity of the glycerol kinase from baker's yeast was accomplished using the diluted enzymatic ...
Ceramic raw materials from the State of Maranhao, Brazil. Part 1: chemical and mineralogical characterization and technological properties of clays from Sao Luis, Rosario, Pinheiro and Mirinzal
(Escola de Minas, 2012-10-01)
This work involved the characterization of clays collected in the municipalities of Sao Luis, Rosario, Pinheiro and Mirinzal (state of Maranho, Brazil), based on specific mass, specific surface area, cation exchange capacity ...
Production of agroindustrial ashes with pozzolanic activity via acid leaching, conjugated burning and ultrafine grinding
(ANTAC - Associação Nacional de Tecnologia do Ambiente Construído, 2020)
Structural and Electric-Optical Properties of Zinc Phthalocyanine Evaporated Thin Films: Temperature and Thickness Effects
(Amer Chemical Soc, 2010-07-22)
It is known that the molecular architecture plays a fundamental role in the electrical and optical properties of materials processed in the form of thin films. Here, zinc phthalocyanine (ZnPc) thin films were fabricated ...
Study of the biodegradation of a polymer derived from castor oil by scanning electron microscopy, thermogravimetry and infrared spectroscopy
(Associação Brasileira de Polímeros, 2006-06-01)
The aim of this research is to study the biodegradation of a polyurethane derived from castor oil, which contains polyester segment in its molecular structure, thus becoming susceptible to the microorganisms attack. The ...