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Mostrando 25-36 de 494 artigos, teses e dissertações.
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25. DESENVOLVIMENTO DE METODOLOGIA DE REVELAÇÃO DE IMPRESSÃO DIGITAL LATENTE COM CHALCONAS
Fingerprints are unique for each individual contributing to human identification in forensic cases. Visualization of latent fingerprints usually involves the use of a chemical substance that creates a contrast between fingerprint residues and the surface on which the print was deposited. Commercial powders used as fingerprint developers by papilloscopy have
Quím. Nova. Publicado em: 21/10/2019
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26. Obtaining Composites Powders of Al2 O3 / Ni and Al2 O3 / Nb by Mechanical Alloying
Mechanical alloying (MA) can be highlighted among the various methods and powder processing forms, which consists of producing homogeneous materials from elementary powders. This process is of paramount importance as it has the ability to reduce the particle size of the powders and can often promote bonding between elements which have low interaction and wet
Mat. Res.. Publicado em: 14/10/2019
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27. Doxycycline release and antibacterial activity from PMMA/PEO electrospun fiber mats
Abstract Objective: To investigate the use of polymethyl methacrylate (PMMA) electrospun fiber mats containing different amounts of polyethylene oxide (PEO) as a doxycycline delivery system and to test antibacterial activity against an oral pathogen. Methodology: PMMA powders or PEO (mol wt 200 Kd) (10,20,30% w/w/) were dissolved in N, N-dimethylformamide
J. Appl. Oral Sci.. Publicado em: 07/10/2019
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28. Estudio de las propiedades, estructurales, morfológicas y ópticas de nanopartículas de Cr2O3 sintetizadas por procesos de combustión de un solo paso y diferentes combustibles
ABSTRACT This research presents a novel one–step solution combustion synthesis to obtain nano-structured Cr2O3 from chrome nitrate solution and one fuel such as aspartic acid (Asp) or Lysine (Lys), or Autor Restrihydroxymethylaminomethane (Tris) or ethylenediaminetetraacetic acid (Edta). Once obtained, the ashes were calcined at 500°C. The powders were ch
Matéria (Rio J.). Publicado em: 16/09/2019
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29. Characterization of Ti-35Nb alloy surface modified by controlled chemical oxidation for surgical implant applications
ABSTRACT Titanium-Niobium alloys have been studied for biomedical applications due to their satisfactory biocompatibility. In order to improve the long-term implantation, surface modification techniques have been developed to generate suitable topography, roughness, chemical composition, surface energy, etc. Considering this approach, the present work aimed
Matéria (Rio J.). Publicado em: 16/09/2019
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30. Efeito da temperatura na cinética de secagem em leito de espuma e na degradação de antocianina em morango
Resumo O morango é uma fruta de grande consumo no mundo e de grande riqueza nutricional, sendo utilizada como ingrediente na elaboração de diversos produtos. No entanto, trata-se de uma fruta de alta perecibilidade, exigindo tecnologias para o aumento da vida útil. Diante disso, o objetivo deste trabalho foi avaliar a cinética de secagem e o efeito da t
Braz. J. Food Technol.. Publicado em: 05/09/2019
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31. Comparison of Aluminum Based Alloys Reinforced with Intermetallic Developed by Powder Metallurgy and Arc Melting Routes
Abstract In this work, Al-Ti alloys were prepared using metallic powders of Al and Ti via Powder Metallurgy (PM) and Arc Melting (AM) route. Four chemical compositions including pure aluminum were studied. Metallic powders were mixed with three compositions, Al-5Ti, Al-10Ti and Al-10Ti-2SiC. All the compositions were in atomic percentage. In case of PM, samp
Soldag. insp.. Publicado em: 29/08/2019
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32. Influência do tipo de solvente na síntese de mulita pelo método Pechini
Resumo Mulita é um aluminossilicato com grande importância na tecnologia cerâmica. Sua síntese através de métodos químicos tem sido extensivamente estudada, no entanto, não se observam estudos da sua obtenção pelo método Pechini. Assim, este estudo teve por objetivo a síntese de mulita por meio deste método. Foi avaliada a influência de diverso
Cerâmica. Publicado em: 15/08/2019
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33. Ethnomedicinal plants used for snakebite treatments in Ethiopia: a comprehensive overview
Abstract Traditional medicine plays an important role in the daily lives of people living in rural parts of Ethiopia. Despite the fact that Ethiopia has a long history of using traditional medicinal plants as an alternative medicine source, there is no checklist compiling these plants used for snakebite treatment. This review collected and compiled available
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 05/08/2019
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34. Biomimetic Coating of Mechanochemically Synthesized Zirconium Titanate
A biomimetic method was used to promote bioactivity of ZrTiO4. Zirconium titanate was obtained by using a combination of techniques such as mechanical milling and heat treatment of zirconia and titania powders. The effect of milling time on the evolution of the ZrTiO4 phase formation was studied. Powders were uniaxially pressed followed by heat treatment for
Mat. Res.. Publicado em: 10/07/2019
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35. Analysis of the densification of a composite obtained by sintering process of aluminum bronze powders with different carbides
Abstract Aluminum bronze alloy is applied in environments that require materials of high mechanical resistance and wear, such as marine, oil & gas and aerospace ones. This study analyzes the densification of composites based on aluminum bronze with additions of the vanadium (VC) and niobium (NbC) carbides, and the influence of these carbides in the milling e
REM, Int. Eng. J.. Publicado em: 19/06/2019
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36. Study of ZnAl2O4 spinel nanoparticles synthesized using gelatin as organic precursor
Resumo Neste trabalho, pós do espinélio aluminato de zinco foram preparados por um método Pechini modificado, rápido, simples, ambientamento seguro e de baixo custo, utilizando gelatina comercial como precursor orgânico. Os materiais foram calcinados a 600, 700 e 800 °C e caracterizados por análise termogravimétrica, difratometria de raios X (DRX) in
Cerâmica. Publicado em: 06/06/2019