Laser Doppler Velocimetry
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Investigation into the role of NaOH and calcium ions in the synthesis of calcium phosphate nanoshells
Calcium phosphate (CaP) nanoshells were prepared using negatively charged liposomes (1,2-dioleoyl-sn-glycero-3-phosphate sodium salt (DOPA)) as a template by base titration synthesis at various concentrations of NaOH and calcium ions. The elemental composition, morphology, particle size, particle size distribution and zeta potential of the products were dete
Brazilian Journal of Chemical Engineering. Publicado em: 2012-03
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2. DEVELOPMENT OF A NATURAL GAS BURNER FOR THE STUDIES OF COMBUSTION IN TURBULENT FLOWS / DESENVOLVIMENTO DE UM QUEIMADOR DE GÁS NATURAL PARA ESTUDOS DA COMBUSTÃO EM ESCOAMENTOS TURBULENTOS
This work presents an experimental study of chemically inert and reactive turbulent flows in a Bluff-Body burner. The main objective is the characterization of the flow through of the measurement of instantaneous velocity fields by using non intrusive optical techniques. The techniques employed were Laser Doppler Velocimetry (LDV) and Particle Image Velocime
Publicado em: 2006
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3. STUDY OF FLOW AND HEAT TRANSFER CHARACTERISTICS IN A SWIRLING IMPINGING JET / ESTUDO DO ESCOAMENTO E TRANSFERÊNCIA DE CALOR EM UM JATO ESPIRALADO INCIDENTE
The present work is an experimental study of the characteristics of a swirling impinging air jet. The goals of the study are: to evaluate the influence of the presence of a circumferential velocity component in the distribution of the local heat transfer coefficients, to obtain instantaneous velocity fields in the axisymmetric plane, as well as information a
Publicado em: 2005
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4. 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
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5. 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
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6. Retinal circulation during a spontaneous rise of intraocular pressure.
The retinal haemodynamic changes occurring in an eye with a spontaneous elevation of intraocular pressure were investigated by bidirectional laser Doppler velocimetry and monochromatic fundus photography. At an intraocular pressure of 47 mmHg the blood velocity and volumetric blood flow rate were significantly smaller and arterial blood velocity pulsatility
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7. Otolaryngology/Head and Neck Surgery: Laser Doppler Velocimetry to Predict Skin Flap Survival
The Scientific Board of the California Medical Association presents the following inventory of items of progress in otolaryngology/head and neck surgery. Each item, in the judgment of a panel of knowledgeable physicians, has recently become reasonably firmly established, both as to scientific fact and important clinical significance. The items are presented
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8. Retinal haemodynamics in patients with early diabetes mellitus.
AIMS/BACKGROUND: The retinal circulation was investigated in a group of 19 patients with insulin dependent diabetes mellitus with less than 4 years of disease duration and no evidence of diabetic retinopathy. Results of these patients were compared with those of 16 age-matched normal controls. METHODS: Venous diameter (D) was measured from monochromatic fund
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9. Solubilization of Minerals by Bacteria: Electrophoretic Mobility of Thiobacillus ferrooxidans in the Presence of Iron, Pyrite, and Sulfur
Thiobacillus ferroxidans is an obligate acidophile that respires aerobically on pyrite, elemental sulfur, or soluble ferrous ions. The electrophoretic mobility of the bacterium was determined by laser Doppler velocimetry under physiological conditions. When grown on pyrite or ferrous ions, washed cells were negatively charged at pH 2.0. The density of the ne
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10. Increase of sympathetic discharge to skeletal muscle but not to skin during mild lower body negative pressure in humans.
1. Haemodynamic studies in humans have concluded that the cutaneous circulation is regulated by cardiopulmonary baroreceptors. In contrast, neurophysiological studies have indicated that skin sympathetic outflow, unlike muscle sympathetic outflow, is unaffected by perturbations in baroreceptor activity. 2. Thus, in an attempt to resolve this discrepancy, bot
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11. Effect of intranasal histamine on nasal mucosal blood flow and the antidiuretic activity of desmopressin.
The effects of exogenous histamine on nasal mucosal blood flow and the systemic activity of intranasally administered desmopressin, a vasopressin analogue, were studied in normal volunteers. Ten subjects received either saline or histamine (1, 20, 100, and 500 micrograms) by intranasal spray. Maximal nasal mucosal blood flow response, determined by laser dop
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12. Strict metabolic control and retinal blood flow in diabetes mellitus.
The effects of strict diabetic control on retinal haemodynamics were studied to elucidate whether such effects are associated with retinopathy changes. In 28 patients with poorly controlled insulin dependent diabetes mellitus and non-proliferative retinopathy, retinal haemodynamics were investigated at baseline, 5 days, 2 months, and 6 months after the insti