Variable-speed drive for the mechanical stage of a microscope used as the optical component in a microdensitometer

Caton, J.E.; Willis, D.D.; Anderson, N G

doi:10.1016/0003-2697(72)90416-2

Cited by 3 publications

(1 citation statement)

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“…In this investigation the isochromatics were characterized by the intensity of their colors-i.e., dark red, red, light red, green, yellow. The isochromatics filmed for the centrifuge rotors were identified by matching their colors and intensities against these references by a scanning optieal-microdensitometer designed by Caton et al (1972).…”

Section: Flow Analysis From Double Refraction Measurementsmentioning

confidence: 99%

Transport Phenomena in Zonal Centrifuge Rotors. VII. Two-Dimensional Transient Flow Patterns and Shear Stress Distributions

Pham¹,

Hsu²

1972

Ind. Eng. Chem. Proc. Des. Dev.

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Two-dimensional transient velocity components, vr and v9, and shear stress, and rr9, distributions in Beckman B-XV size zonal centrifuge rotors were studied by the technique of birefringence using a milling yellow dye solution as an optical solution. The investigation was performed with 3, 4, 6, and 1 2 septa in a rotor with the acceleration and deceleration rates varying from ±0.4 to ±3.0 revolutions/sec2. The experiments showed that 3 or 1 2 septa configuration rotors exhibit lower shear stress distributions than the other rotor configurations, but more prominent secondary flow are occurring in these. Rotor configurations with 4 or 6 septa exhibit no secondary flow patterns, but the shear stress distributions are four to six times higher than those in 3 or 1 2 septa configuration rotors. Changing the rate of acceleration produces no noticeable effect in any flow patterns, shear stress distributions, or their magnitudes during each transient period.

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Section: Flow Analysis From Double Refraction Measurementsmentioning

confidence: 99%