Pulsations
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Employment of acoustic field for pollutant emission reduction under lean combustion
Pulsating combustion is a technique that directly intervenes in combustion processes modifying pollutant emissions and increasing thermal efficiency by varying pressure and temperature in the flame region. The pulsations accelerate mixture rate between oxidant and fuel, resulting in a more intense combustion process, with low fuel waste and potential for low
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/07/2011
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2. Entrenamiento del vibrato en cantantes
BACKGROUND: vocal vibrato is one of the most important acoustic, technical and stylistic features to characterize the voice quality in classical singers. Technically, vibrato is a pulsation of pitch, usually accompanied with synchronous pulsations with intensity and timbre. Vibrato can be described acoustically by the rate, extent and periodicity of frequenc
Revista CEFAC. Publicado em: 23/07/2010
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3. Experimental analysis in pulsating diffusion flames of natural gas / Análise experimental em chamas difusivas pulsadas de gás natural
In spite of the amount of research already conducted in pulse combustion, not all parameters involving its optimization process are fully known for utilization in large scale, in applications that utilize the process with low CO and NOx emissions. This dissertation presents a study on the efficiency of acoustic pulsations in the combustion process of natural
Publicado em: 2002
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4. Estudo das variabilidades espectroscópicas da estrela η Centauri / Study of spectroscopic variabilities of star η Centauri
A espectrocopia de estrelas Be realizada com alta resolução e alta relação sinal/ruído permite investigar variações temporais rápidas nos perfis de linhas de absorção, usualmente atribuidas às pulsações não radiais, entre outros mecanismos. O fenômeno Be é transitorio para esse tipo de estrelas. Com efeito, seus espectros podem apresentar as
Publicado em: 2000
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5. 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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6. Pulsatile hepatomegaly in constrictive pericarditis.
In a study of 30 consecutive patients with constrictive pericarditis diagnosed by clinical, radiological, and echocardiographic criteria 21 (70%) were found to have pulsatile hepatomegaly. The pulsations were felt clinically and confirmed by external hepatic recordings. These pulsations conformed almost identically to the jugular venous pulsations in the nec
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7. Effect of isoproterenol, phenylephrine, and sodium nitroprusside on fundus pulsations in healthy volunteers.
AIMS/BACKGROUND: Recently a laser interferometric method for topical measurement of fundus pulsations has been developed. Fundus pulsations in the macular region are caused by the inflow and outflow of blood into the choroid. The purpose of this work was to study the influence of a peripheral vasoconstricting (the alpha 1 adrenoceptor agonist phenylephrine),
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8. PRÆCORDIAL PULSATIONS IN RELATION TO CARDIAC MOVEMENT AND SOUNDS
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9. Jugular, hepatic, and praecordial pulsations in constrictive pericarditis.
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10. MELANOPHORE PULSATIONS IN THE ISOLATED SCALES OF FUNDULUS HETEROCLITUS
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11. PALPABLE VENOUS PULSATIONS IN A CASE OF TRANSPOSITION OF BOTH ARTERIAL TRUNKS AND COMPLETE HEART BLOCK
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12. Genetic implications of periodic pulsations of the rate of synthesis and the composition of rapidly labeled bacterial RNA.