scholarly journals Dual-reference digital holographic interferometry for analyzing high-density gradients in fluid mechanics

2018 ◽  
Vol 43 (8) ◽  
pp. 1635 ◽  
Author(s):  
Jean-Michel Desse ◽  
François Olchewsky
Keyword(s):  
Fluid Mechanics ◽  
Holographic Interferometry ◽  
High Density ◽  
Density Gradients

Investigation of high density gradients flows by pulsed digital holographic interferometry

2017 ◽  
Author(s):  
Jean-Michel Desse ◽  
François Olchewsky ◽  
Zacaria Essaïdi ◽  
François Nicolas ◽  
David Donjat ◽  
...  
Keyword(s):  
Holographic Interferometry ◽  
High Density ◽  
Density Gradients

Synthesis of High-Density Grafted Polymer Layers with Thickness and Grafting Density Gradients

Langmuir ◽  
2005 ◽  
Vol 21 (25) ◽  
pp. 11806-11813 ◽  
Author(s):  
Yong Liu ◽  
Viktor Klep ◽  
Bogdan Zdyrko ◽  
Igor Luzinov
Keyword(s):  
High Density ◽  
Density Gradients ◽  
Polymer Layers ◽  
Grafted Polymer ◽  
Grafting Density

scholarly journals Laser produced plasma refractometry

1990 ◽  
Vol 8 (1-2) ◽  
pp. 339-342 ◽  
Author(s):  
Yu. A. Zakharenkov ◽  
A. V. Kosterin ◽  
A. S. Shikanov ◽  
V. V. Pikalov ◽  
N. G. Preobrazhensky
Keyword(s):  
Phase Shift ◽  
Impact Parameter ◽  
Input Data ◽  
High Density ◽  
Density Gradients ◽  
Refraction Angle ◽  
Laser Produced Plasma

A method of probing beam refraction is suggested for the investigation of laserproduced plasma with high density gradients. The refraction angle α of a probing ray as a function of ray impact parameter p is used as input data. Different experimental realizations of α(p) measurements are considered. Results from laser produced plasma interferograms processed with phase shift and refractometry methods are compared.

scholarly journals The relation of platelet density to platelet age: survival of low- and high-density 111indium-labeled platelets in baboons

Blood ◽  
1986 ◽  
Vol 68 (2) ◽  
pp. 386-393
Author(s):  
B Savage ◽  
PR McFadden ◽  
SR Hanson ◽  
LA Harker
Keyword(s):  
Specific Radioactivity ◽  
High Density ◽  
High Yield ◽  
Low Density ◽  
Density Gradients ◽  
Continuous Linear ◽  
Survival Times ◽  
Density Fractions ◽  
Age Related

The relationship between platelet density and platelet age has been studied using continuous linear Percoll density gradients and 111In- labeling of autologous platelets in baboons. To investigate changes in platelet density during senescence in the circulation, baboons were infused with 111In-labeled autologous platelets, and blood was collected at one hour postinfusion and twice daily thereafter for six days. Platelets were isolated from these samples in high yield (greater than 95%) and separated in continuous linear Percoll density gradients following density equilibrium centrifugation. Although at one hour postinfusion the density distribution of radiolabeled platelets coincided closely with the distribution of the total platelet population, a detectable symmetrical shift toward higher densities was observed after five days. The relative specific radioactivity (RSR) of high-density platelets (1.064 to 1.067 g/mL) decreased at a slower rate than that of the total platelet population (platelets of all densities), whereas the RSR of low-density platelets (1.053 to 1.056 g/mL) showed a more immediate and rapid decrease. These results give rise to one of two interpretations: (1) low-density platelets have a shorter survival time than more dense platelets and are therefore cleared from the circulation at a faster rate, or (2) platelets of all densities increase in density upon aging in the circulation. To determine the explanation for changing RSR of different density fractions we studied the in vivo disappearance characteristics of low- and high-density 111In-labeled platelets. There were no significant differences between the mean survival times of low-density platelets (5.0 +/- 0.49 days, +/- 1 SD, n = 6), high-density platelets (4.9 +/- 0.56 days, n = 6), or control platelets representing platelets of all densities (4.9 +/- 0.38 days, n = 6). Although a slight increase in the density of all platelets during platelet senescence is indicated by these studies, we conclude that platelet density heterogeneity is not primarily a consequence of age-related changes in platelet density.

Modeling Vortex Induced Motion in Sheared Currents

2014 ◽  
Author(s):  
Samuel Holmes
Keyword(s):  
Fluid Mechanics ◽  
Velocity Gradient ◽  
Computational Fluid Mechanics ◽  
Density Gradients ◽  
Spar Platform ◽  
Induced Motion

In this paper we examine the vortex induced motions (VIM) of a spar platform in a sheared current. This study is motivated in part by the problem of using flume tanks for the simulation of platform VIM in sheared currents. To date, such experiments have not tried to reproduce the density gradients seen in the ocean in the presence of a stable sheared current. Instead, the flume tanks are kept short so that a velocity gradient introduced at one end is preserved long enough so that a sheared current exists at the model. In this paper we use computational fluid mechanics to simulate both problems. It is shown that buoyancy effects can be significant and need to be considered in the interpretation of flume tank experiments.

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