Doppler Velocimeter
Mostrando 1-12 de 14 artigos, teses e dissertações.
-
1. Influência da taxa de aplicação superficial e da concentração de ar na eficiência de clarificação de água de abastecimento em unidades de flotação por ar dissolvido / Influence of surface application fee and concentration of air in efficiency of clarification of water supply in units dissolved air flotation
Os objetivos deste trabalho foram verificar a influência das taxas de aplicação superficial das zonas de separação e de contato e da concentração de micro bolhas de ar na eficiência da remoção de partículas em unidades de flotação aplicadas ao tratamento de água para abastecimento público e, caracterizar a estrutura de escoamento no interior d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/09/2011
-
2. Theoretical-experimental study on two-dimentional confined jets. / Estudo teórico-experimental de jatos bi-dimensionais confinados.
The main objective of this thesis is to study the mean flow inertial and pressure effects on the mean flow itself in two-dimensional confined jets. The flows considered in the present work are turbulent, isothermal, incompressible and single-fluid. The introduction and the bibliographical review are done by the following presentations: technological and fund
Publicado em: 2009
-
3. Análise da macroturbulência do escoamento em escadas para peixes por bacias sucessivas
Os mecanismos de transposição de peixes (MTP) são estruturas ou sistemas que possibilitam a migração da ictiofauna entre as partes de jusante/montante/jusante de uma barragem. As escadas para peixes representam um dos tipos de MTP mais conhecidos no mundo e apresentam diversas configurações geométricas. A escolha do tipo de escada deve atender às ca
Publicado em: 2008
-
4. Analise da dopplervelocimetria feto-placentaria em gestantes hipertensas e resultados perinatais segundo a idade gestacional
Objetive: To evaluate the capacity of the pulsatility Index of the umbilical artery and of the median cerebral artery and of the umbilical/cerebral ratio to predict adverse perinatla outcomes. Métodos: Dopplervelocimetric evaluation of the pulsatility Index of the umbilical artery (IPAU) and of the Median cerebral artery (IPACM) and of the umbilical/cerebra
Publicado em: 2006
-
5. Contribuição da velocimetria doppler laser para a otimização de componentes descartaveis utilizados em circulação extracorporea
t: Introduction: Cardiopulmonary bypass ( CBP ) associates techniques that allow a temporary cardiopulmonary isolation through utilization of a set of machines, devices and circuits. Sophisticated techniques must be applied in order to study blood behavior inside cardiopulmonary bypass system without interference. The Laser Doppler Velocimetry (LDV) uses lig
Publicado em: 2002
-
6. An experimental investigation of the effects of nozzle ellipticity on the flow structure of co-flow jet diffusion flames
The flow structure of cold and ignited jets issuing into a co-flowing air stream was experimentally studied using a laser Doppler velocimeter. Methane was employed as the jet fluid discharging from circular and elliptic nozzles with aspect ratios varying from 1.29 to 1.60. The diameter of the circular nozzle was 4.6 mm and the elliptic nozzles had approximat
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
-
7. Optic nerve head blood flow using a laser Doppler velocimeter and haemorheology in primary open angle glaucoma and normal pressure glaucoma.
Optic disc blood flow velocity was measured in healthy patients, those with primary open angle glaucoma (POAG), and patients with normal pressure glaucoma (NPG). The velocity of the red blood cells (RBCs) in the capillaries of the optic nerve head (ONH) has been measured with a laser Doppler velocimeter (LDV), and blood viscosity has been evaluated notably b
-
8. Quantitative assessment of tricuspid regurgitation using pulsed Doppler echocardiography.
Tricuspid valve regurgitation was assessed quantitatively by measuring blood flow velocity in the vena cava using a pulsed Doppler velocimeter. A non-invasive index of regurgitation was obtained by calculating the ratio between the maximum amplitudes of the systolic and diastolic components of the velocity curves. The index was compared with the angiographic
-
9. Variation in cutaneous perfusion due to synthetic pyrethroid exposure.
Synthetic pyrethroids are neurotoxic insecticides with a low mammalian toxicity. Prior investigations have found these agents to be neither cutaneous irritants nor sensitisers. Clinically demonstrable inflammation, as judged by erythema, oedema, or vesiculation, has not been apparent. Nevertheless, paraesthesia does result from cutaneous exposure. In this in
-
10. Normal pattern and physiological significance of mitral valve flow velocity recorded using transseptal directional Doppler ultrasound catheterization.
In 10 cardiac patients in whom an organic lesion of the mitral valve was exluded by standard investigation procedures during which a diagnostic transseptal catheterization for pressure measurements in the left heart was performed, the authors placed a directional Doppler ultrasonic catheter tip velocimeter at the site of the mitral ring and recorded the mitr
-
11. Diagnosis and evaluation of mitral valve disease using transseptal Doppler ultrasound catheterization.
In 33 patients with confirmed mitral valve disease, the mitral valve flow velocity traces were recorded by means of a directional Doppler ultrasonic velocimeter using the transseptal route, and correlated with the clinical and haemodynamic data. In all cases, characteristic anomalies of the mitral flow velocity patterns were noted and could be related to the
-
12. Retinal blood flow after superior cervical ganglionectomy: a laser Doppler study in the cynomolgus monkey.
There is a conflicting literature regarding the possible presence of adrenergic innervation of the retinal circulation. The effect of a histologically confirmed left superior cervical ganglionectomy on the total retinal blood flow in eight anaesthetised female cynomolgus monkeys was determined. Near total unilateral ocular sympathetic denervation was confirm