Dynamic Tests
Mostrando 1-12 de 462 artigos, teses e dissertações.
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1. Study of soils used with subgrade and sub-ballast in Brazilian railways
Abstract Brazil has an extremely limited railroad network compared to other developed and developing countries. There are projects to expand this mesh. Knowing that the cost of implementing a railroad is high, research for solutions that allow cost reduction is of great importance. But the parameters of the materials used in the subgrade and sub-ballast laye
REM - International Engineering Journal. Publicado em: 2022
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2. Influence of the physical characteristics of sand and the crushed filler content on the properties of self-leveling mortars
Abstract The properties of self-leveling mortars (SLMs) in the fresh and hardened state are strongly affected by their formulation. In this study, the influence of three different quartz sands (different physical characteristics) was investigated in SLMs, as well as the replacement of these sands by crushed basalt filler. The tests performed were: spreading,
Cerâmica. Publicado em: 2021-06
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3. Evaluation of Antibacterial Activity, Chromatographic Analysis for Rutin and Quercetin Quantification Using HPLC-UV-Vis from the Hydro-Alcoholic Extract Obtained from Bidens pilosa Linné
Novel and miniaturized technique, a dynamic sonication-assisted solvent extraction before the analysis by high performance liquid chromatography-ultraviolet visible (HPLC-UV-Vis) for isolation, identification and quantification of rutin and quercetin metabolites in alcoholic extracts from Bidens pilosa Linné, was developed. The results showed that the flowe
J. Braz. Chem. Soc.. Publicado em: 2021-03
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4. Collusion: How Central Bankers Rigged the World
Abstract This article presents a study on the performance of semi-empirical methods based on the Standard Penetration Test (SPT) for the prediction of bearing capacity already disseminated in the practice of Brazilian Foundation Engineering (Aoki and Velloso, 1975; Décourt and Quaresma, 1978, 1996; Teixeira,1996), together with the recent method proposed by
Contexto int.. Publicado em: 2020-12
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5. Forecasting bearing capacity performance with semi-empirical and theoretical methods applied to precast concrete piles founded on sandy clay in the region of Uberlândia-MG, Brazil
Abstract This article presents a study on the performance of semi-empirical methods based on the Standard Penetration Test (SPT) for the prediction of bearing capacity already disseminated in the practice of Brazilian Foundation Engineering (Aoki and Velloso, 1975; Décourt and Quaresma, 1978, 1996; Teixeira,1996), together with the recent method proposed by
REM, Int. Eng. J.. Publicado em: 2020-12
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6. Aerodynamic effects on a high slenderness concrete chimney
Resumo Este trabalho apresenta os resultados da determinação teórico-experimental do comportamento aerodinâmico de uma chaminé esbelta de concreto armado, com 150m de altura e esbeltez 30. Foram construídos dois modelos reduzidos: um rígido para medição das pressões e outro aeroelástico, reproduzindo as principais características dinâmicas da es
Rev. IBRACON Estrut. Mater.. Publicado em: 13/12/2019
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7. Hardening and Dynamic Recovery During Hot Compression Test of Copper Simulated as Viscoplastic Material
The Norton-Bailey equation was used to simulate by finite elements the hardening and dynamic recovery of copper during the hot compression tests. The constants of Norton-Bailey equation were determined from the Voce-Kocks model. The simulation assumes a Mortar Contact with Coulomb friction and axial symmetry. Numerical results were compared with experiments.
Mat. Res.. Publicado em: 05/12/2019
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8. Fatores associados ao equilíbrio postural de idosos longevos
Resumo Introdução: Estima-se que a população idosa está associada a distúrbios do equilíbrio, limitação nas atividades e isolamento social. Objetivo: Avaliar o equilíbrio corporal de idosos longevos. Método: Estudo transversal, analítico, em idosos com idade igual ou superior a 80 anos, dos sexos masculino e feminino, avaliados clinicamente e
Fisioter. mov.. Publicado em: 28/11/2019
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9. Effects of Frequency, Temperature and Test Duration in the Viscoelasticity of Brazilian Hardwoods Used in Handmade Musical Instruments
This study aims to make a comprehensive analysis on the viscoelastic behavior of typical tropical hardwoods and its influences in making musical instruments. For that a Dynamic-Mechanical Analysis was done and the mechanical parameters dependence on test control parameters like temperature, frequency and test duration time were measured. For Dalbergia Nigra
Mat. Res.. Publicado em: 24/10/2019
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10. Influencia de la geometría del proyectil en ensayos dinámicos de tracción
ABSTRACT The focus of this study is to discuss the influence of the projectile’s length on the results of an experiment of the Hopkinson Traction Bar (SHTB). Simulations have been made by means of finite elements using the commercial software ABAQUS in tests of traction at high speeds of deformation in samples of aluminum alloy 7017T73 varying the length o
Matéria (Rio J.). Publicado em: 16/09/2019
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11. Aço de alta dureza para aplicação balística: propriedades mecânicas
RESUMO Blindagens balísticas são projetadas a resistir determinadas ameaças, que dependem da aplicação. Estas ameaças podem ser geradas por projéteis de armas de fogo ou estilhaços provenientes de explosões com diferentes energias cinéticas. Os materiais normalmente utilizados para este propósito são metálicos, não metálicos e compósitos, sen
Matéria (Rio J.). Publicado em: 16/09/2019
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12. Influences on the Functional Behavior of Great Arteries during Orthostasis
Resumo Fundamento: A redução da complacência arterial tem sido associada ao envelhecimento e à hipertensão na postura supina. Entretanto, os efeitos dinâmicos do ortostatismo na distensibilidade aórtica não foram definidos. Objetivo: Determinar a influência ortostática e a interferência da idade, pressão arterial (PA) e frequência cardíaca (F
Arq. Bras. Cardiol.. Publicado em: 09/09/2019