Forced Oscillations
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Técnica de oscilações forçadas monofrequência na análise em tempo real das alterações mecânicas ao longo do ciclo respiratório de asmáticos com diferentes níveis de obstrução ao fluxo aéreo / Forced oscillation technique monofrequencia in real-time analysis of changes to mechanical cycle of respiratory asthmatics with diferent levels of arflow obstructions
A análise da mecânica respiratória em tempo real pela Técnica de OscilaçõesForçadas (FOT) Monofrequência é de interesse nos estudos clínicos e diagnósticos de doenças respiratórias. Entretanto, ainda é escassa a análise de asmáticos com esta técnica. O presente trabalho avalia a contribuição da FOT monofrequência na análise das alteraç�
Publicado em: 2010
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2. Estudo da estabilidade secundária da esteira de um cilindro em oscilação forçada. / Study of secondary stability of the wake of a circular cylinder undergoing forced oscilation.
This thesis presents the investigation of the transition to a three-dimensional flow in the wake of an oscillating circular cylinder. This is the secondary transition of the flow around a circular cylinder, while the primary transition leads to the von Kármán wake. The investigative work is performed in the Reynolds number (Re) range which occurs the secon
Publicado em: 2010
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3. Optimal configurations of composite multiple mass dampers in tall buildings
The effectiveness of multiple tuned mass dampers (MTMD) for suppressing harmonically forced oscillations is studied in the paper. In particular the influence of possible connections between the masses of the damper on the main system performance is investigated using four different configurations of a double mass damper. For this, a minimax procedure, which
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-03
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4. Modificação técnica e conceitual no sistema de segurança dos geradores e condutos forçados ns 1 e 2 da usina Henry Borden
This study aims to propose a technical and conceptual modification in the safety system of generators and forced ducts n 1 and 2 of Henry Borden hydroelectric power plant, in Cubatão - Sao Paulo, with the main objective of reducing the water hammer in the forced ducts. This work starts with a concise review on hydraulic turbines, with emphasis on the most c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/03/2008
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5. The role of the local and remote effects on the upwelling system variabilities along the western coast of South America, during El Niño / O papel de efeitos locais e remotos em variabilidades do sistema de ressurgência ao largo da costa oeste da América do Sul durante o El Niño
Off the western coast of South America, the coastal upwelling system presents an exceptional productivity, a result of the high efficiency of the biological ecosystem in converting the primary production into biomass. These chemical and biological processes are strongly modulated by the physical environment. For instance, during El Ni~no events the fishery p
Publicado em: 2008
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6. Estudo numérico do escoamento ao redor de um cilindro oscilando. / Numerical investigation of the flow around an oscillating cylinder.
The goal of this work is to study through numerical simulations using the Spectral Elements Method the two-dimensional the flow past a single circular cylinder that is either in simple harmonic cross-flow oscillation or elastically mounted. This is a very important topic for the technological environment because this configuration is identical to offshore st
Publicado em: 2007
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7. Ferrofluid hydrodynamics: waves, jets and free drops
A novel approach to hydrodynamical studies uses the bulk force properties of magnetic liquids to probe the dynamics of (i) freely suspended drops; and (ii) unstable surface waves and jets. The fluid dynamics are imaged by a fast CCD camera, allowing thorough analysis of these time-dependent phenomena. Ferrofluid drops are freely suspended in air by using mag
Braz. J. Phys.. Publicado em: 2001-09
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8. Estudos de micropulsacoes geomagneticas PC3-5 em latitudes muito baixas, no Brasil / PC3-5 study of geomagnetic micropulsations at very low latitude, in Brazil
This study is aimed at the understanding of source mechanisms and propagation modes of Pc3-5 micropulsations at very low and equatorial latitudes. It used simultaneous data measured with a chain of 10 geomagnetic stations in Brazil using high sensitive °uxgate magnetometers. Multiple tapered spectral estimation method based on Fast Fourier Transforms (FFT)
Publicado em: 1998
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9. A frequency analysis of neuronal activity in monkey thalamus, motor cortex and electromyograms in wrist oscillations.
1. Extracellular recordings were made in three monkeys while recording from neurones in the motor cortex (eighty-four cells), ventro-posterior lateralis pars caudalis (VPLc, forty-two cells) and cerebellar thalamus (seventy-seven cells). 2. This experiment was designed to produce active and reflex movements of varying velocities in order to study the relatio
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10. Respiratory function in healthy young children using forced oscillations
BMJ Group.
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11. Assessment of bronchodilator responsiveness in preschool children using forced oscillations
BMJ Group.
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12. Evolutionary consequences of changes in species' geographical distributions driven by Milankovitch climate oscillations
We suggest Milankovitch climate oscillations as a common cause for geographical patterns in species diversity, species' range sizes, polyploidy, and the degree of specialization and dispersability of organisms. Periodical changes in the orbit of the Earth cause climatic changes termed Milankovitch oscillations, leading to large changes in the size and locati
The National Academy of Sciences.