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Mostrando 1-12 de 236 artigos, teses e dissertações.
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1. Thermal Infrared Enthalpimetry Method for the Determination of Hypochlorite in Bleaching Solutions
Thermal infrared enthalpimetry (TIE) was used for hypochlorite determination in commercial hypochlorite-based bleaching solutions. Experimental parameters were evaluated for the reaction with a hydrogen peroxide solution. The most relevant conditions were 5% H2O2 (m/m) solution, stirring speed of 250 rpm, dispensing rate of 0.57 mL s-1, and 10 s after reacti
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. REFLECTIONS ON THE INDEXICAL POINT OF VIEW: ON COGNITIVE SIGNIFICANCE AND COGNITIVE DYNAMICS, BY BOJISLAV BOZICKOVIC
Abstract In accounts of indexicals, we encounter two problems: the problem of cognitive significance and the problem of cognitive dynamics. The problem of cognitive significance leads us to posit finer-grained sense content to account for the explanation of our actions and emotions. Meanwhile the problem of cognitive dynamics calls us to show how two episode
Manuscrito. Publicado em: 2022
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3. Midterm Radiographic Results and Reoperations of Tantalum Trabecular Metal Cones in Knee Arthroplasties
Resumo Objetivo O manejo da perda óssea representa um grande desafio em cirurgias de revisão de artroplastia do joelho (rATJ) e em artroplastias totais do joelho (ATJ) primárias complexas. O objetivo do presente estudo foi avaliar os resultados em médio prazo (seguimento mínimo de 5 anos) das reconstruções de joelho nas quais cones de metal trabecula
Revista Brasileira de Ortopedia. Publicado em: 2022
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4. Microstructural and mechanical characterisation of the Simon Bolivar's iron bridge structure, 19th century, Arequipa, Peru
Abstract The microstructure of the main structural elements (Phoenix columns, transversal beams and tie-rods) of the Simón Bolivar iron bridge, located in Arequipa (Peru), was investigated. The bridge was supposedly designed by Gustave Eiffel and opened to the public in 1882. The characterisation revealed that the columns, beams and tie-rods are made of pud
REM, Int. Eng. J.. Publicado em: 2020-12
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5. Effects of an FSS Reflector on a Microstrip Line Fed Bow-Tie Slot Antenna
Abstract This paper describes the analysis of the effects of a frequency selective surface (FSS) on the characteristics of a microstrip line fed antenna with a bow-tie slot in the ground plane for operation in the frequency range 1 to 10 GHz. The use of the FSS is proposed to miniaturize the antenna structure and increase the number of resonance frequencies
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
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6. Should ethanol be considered a treatment for COVID-19?
Abstract This paper describes the analysis of the effects of a frequency selective surface (FSS) on the characteristics of a microstrip line fed antenna with a bow-tie slot in the ground plane for operation in the frequency range 1 to 10 GHz. The use of the FSS is proposed to miniaturize the antenna structure and increase the number of resonance frequencies
Rev. Assoc. Med. Bras.. Publicado em: 2020-09
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7. New Insights into the Partitioning of Phenothiazine Dyes in Aqueous Two-Phase Systems
Aqueous two-phase systems (ATPSs) have proven to be efficient and environmentally safe methods for extracting chemical species. However, the driving forces behind the partition of solutes in these systems are still little understood. A complete thermodynamic partitioning of phenothiazine dyes was investigated in poly(ethylene oxide) (PEO) + salt + water ATPS
J. Braz. Chem. Soc.. Publicado em: 2020-08
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8. Thermal Infrared Enthalpimetry in Paper Microzone Plates for Green and High Throughput Determination of Wine Acidities
The use of paper devices in chemical analysis has been increased due to their low cost, high surface area, portability, and biodegradability. A novel use of paper devices is proposed using thermal infrared enthalpimetry (TIE) for a rapid, green, and high throughput determination of wine acidities. The determination of total, fixed, and volatile acidities in
J. Braz. Chem. Soc.. Publicado em: 2020-02
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9. A Sustainable Methodology to Extract Bismuth from Secondary Sources
Bismuth is a critical metal broadly used in cosmetic, medicine and metallurgy. However, its scarcity in Earth’s crust may impair further applications. An alternative is to recover bismuth from secondary sources. In this work, a methodology to extract bismuth from safety valves of discharged gas cylinders is proposed. Extraction and purification of bismuth
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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10. Design of deep pile caps by strut-and-tie models
Resumo Existem muitos métodos de dimensionamento de blocos de fundações, mas ainda não há consenso sobre qual método fornece a melhor abordagem para o engenheiro de projetos. No Brasil, muitos projetistas de estruturas utilizam o método clássico de Blévot, no entanto, com a revisão da norma NBR 6118 de projeto de estruturas de concreto em 2014, o m
Rev. IBRACON Estrut. Mater.. Publicado em: 23/09/2019
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11. Reinforced concrete corbels strengthened with external prestressing
Resumo As estruturas em concreto podem exigir, ao longo de sua vida útil, o aumento da capacidade de carga devido a eventuais mudanças de utilização. Nesse contexto, os consolos podem ser considerados elementos estruturais que apresentam grandes desafios para a instalação de alternativas de reforço. Tal dificuldade é decorrente do fato de que a capac
Rev. IBRACON Estrut. Mater.. Publicado em: 23/09/2019
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12. Optimized design of RC deep beams based on performance metrics applied to strut and tie model and in-plane stress conditions
Abstract Deep beams do not behave according to classical beam theory. The nonlinearity of strain distribution within these elements requires application of strut and tie models (STM) or other alternatives to evaluate the complex stress field. Although the design of these elements is a common task for structural engineers, limited research is found on assessi
Lat. Am. j. solids struct.. Publicado em: 22/08/2019