A fast synchronously rotating reference frame-based voltage sag detection under practical grid voltages for voltage sag compensation systems

2012 ◽  
Author(s):  
Y. Kumsuwan ◽  
Y. Sillapawicharn
Keyword(s):  
Reference Frame ◽  
Voltage Sag ◽  
Compensation Systems ◽  
Rotating Reference Frame ◽  
Voltage Sag Detection

OBSERVATION OF THE TRANSVERSE STERN–GERLACH EFFECT IN NEUTRAL POTASSIUM

1967 ◽  
Vol 45 (4) ◽  
pp. 1481-1495 ◽  
Author(s):  
Myer Bloom ◽  
Eric Enga ◽  
Hin Lew
Keyword(s):  
Magnetic Field ◽  
Angular Velocity ◽  
Reference Frame ◽  
Inhomogeneous Magnetic Field ◽  
Time Dependent ◽  
Effective Magnetic Field ◽  
Classical Analysis ◽  
At Resonance ◽  
Rotating Reference Frame

A successful transverse Stern–Gerlach experiment has been performed, using a beam of neutral potassium atoms and an inhomogeneous time-dependent magnetic field of the form[Formula: see text]A classical analysis of the Stern–Gerlach experiment is given for a rotating inhomogeneous magnetic field. In general, when space quantization is achieved, the spins are quantized along the effective magnetic field in the reference frame rotating with angular velocity ω about the z axis. For ω = 0, the direction of quantization is the z axis (conventional Stern–Gerlach experiment), while at resonance (ω = −γH0) the direction of quantization is the x axis in the rotating reference frame (transverse Stern–Gerlach experiment). The experiment, which was performed at 7.2 Mc, is described in detail.

Computational Fluid Dynamics Analysis of Fluid Mixing in Single Use Bioreactors

2010 ◽  
Author(s):  
Robert Spall ◽  
Nephi Jones ◽  
Clinton Staheli
Keyword(s):  
Reference Frame ◽  
Bubble Diameter ◽  
Fluid Mixing ◽  
Balance Model ◽  
Transfer Coefficients ◽  
Sliding Mesh ◽  
Mesh Model ◽  
Computational Fluid Dynamics Analysis ◽  
Rotating Reference Frame ◽  
Single Use

CFD calculations were performed for a series of stirred, single use bioreactor vessels using both rotating reference frame and sliding mesh model approaches. Comparisons of quantities such as flow patterns, power numbers, and mixing times are presented. Calculations to predict mass transfer coefficients for a sparged 250L vessel were also performed using the rotating reference frame model. Results presented include those from a series of single, fixed bubble diameter calculations, and those which employed a population balance model consisting of 9 discrete bubble diameters.

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